Table of Contents Chapter Details Page Chapter 1 Existing Agartala Airport 1.1 Background 4 1.2 Location Details of Agartala Airport 4 1.3 Present Status & Facilities At Airport 4 1.3.1 Land Details 5 1.3.2 Aerodrome Technical Data 6 1.3.3 Declared Distance 6 1.3.4 Runway Details 6 1.3.5 Apron 7 1.3.6 Taxiway 7 1.3.7 Ground Lighting Facility 7 1.3.8 Communication 7 1.3.9 Fencing (Operational) 8 Chapter 2 Proposed Development at Agartala Airport 2.1 Master Plan of Agartala Airport 10 2.2 Proposed Development at the Existing Airport 10 2.2.1 Civil Works 10 2.2.2 Electrical Work 11 2.2.3 CNS Works 12 2.2.4 IT & Airports Systems Works 12 2.3 Land Requirement for Proposed Development 12 2.4 New Domestic Terminal Building 12 2.5 Cutting & Filling 13 2.6 GRIHA Rating 13 2.7 Parking Facilities 13 2.8 Power Requirement 13 2.9 Project Cost 13 Chapter 3 BMS System for the Proposed Terminal Building 3.1 HVAC Requirement 21 3.2 Design Considerations 21 3.3 Capital Cost 21 3.4 Energy Efficient 21 3.5 Flexibility 22 3.6 Control System 22 3.7 System design (Ventilation & Miscellaneous) 22 3.8 Building Management System (BMS) 22 Chapter 4 Water Supply, Sewerage & Drainage Airport Authority of India 1
4.1 Introduction 24 4.2 Expected Population per day at Airport 24 4.3 Total Water Required 25 4.4 Sources of Water 26 4.5 Sanitary Fixtures and Toilet Accessories 26 4.6 Water Distributions Pipe and Fittings 26 4.7 Sewerage Treatment and Disposal 26 4.8 Sewage Treatment Plant 26 4.9 Rain Water Harvesting 31 Chapter 5 Solid Waste Management 5.1 Solid Waste Generation 34 5.2 Solid Waste Management 34 Chapter 6 Energy Conservation 6.1 Energy Conservation Measures 36 List of figures Figure 1.1 Location of Agartala Airport on Google Map 5 Figure 2.1 Master Plan for Agartala Airport 14 Figure 2.2 Layout Plan of New Terminal Building at Agartala 15 Figure 2.3 Elevation Section of New Terminal Building at Agartala 16 Figure 2.4 First Floor Plan for New Terminal Building at Agartala 17 Figure 2.5 Ground Floor Plan for New Terminal Building at Agartala 18 Figure 2.6 Basement Plan for New Terminal Building at Agartala 19 Figure 4.1 Water Balance Diagram for Agartala Airport 25 Figure 4.2 Schematic Diagram for MBBR Based STP 31 Figure 4.3 Typical Cross Section of Rain Water Harvesting Pit 32 Airport Authority of India 2
Chapter 1 Existing Agartala Airport Airport Authority of India 3
Proposed Development at Agartala Airport Chapter 1 1.1 Background Agartala is the capital of State Tripura and at geographical co-ordinates 23 45-23 55 N latitude and 91 15-91 20 E longitude, in the flood Plains of the Howrah River. National Highway (NH-44) passes through Agartala. Agartala has been connected to other cities in India since June 2008 through Agartala Railway Station. Agartala is connected by air, via Agartala Airport which connects it to other cities in India. There are direct flight connections to Kolkata, Imphal, Delhi, Silchar, Aizwal, Guwahati, Bangalore, Chennai, Ahmedabad and Mumbai. Agartala airport is the second busiest airport in north east India after Guwahati. The airport is located in Singerbhil 11.5 km (6.7 nautical miles) northwest from the heart of the city of Agartala. Agartala Airport, one of the major airports in North East Region is situated in the state of Tripura, belongs to AAI. Operators like Air India, Jet Airways, Spice jet, Indigo and Pawan Hans Helicopters are presently operating with 11 flights movements per day and 77 flights in a week. The Airport is a Domestic airport and suitable for operation of A-320/A-321 type of aircraft. 1.2 Location Details of Agartala Airport Agartala Airport, one of the major airports in North East Region is situated in the state of Tripura is located 11.5 km from the main Agartala city. Agartala airport approximately 11 km away from bus stand and airport well connected with railway station. The geographical coordinates of airport are 23 o 53 26 N and 91 o 14 21 E The location of Agartala Airport on google map is shown on Figure 1.1. 1.3 Present Status & Facilities at Airport Agartala airport is located about 11.5 km from the main city Agartala of Tripura. At present the dimension of runway of airport is 2286m 45m that is connected to taxiway. The runway is suitable for operation of A-320/A-321 type aircraft. Apron at airport is sufficient for 3 nos of A-320/A-321 aircrafts and 2 nos ATR-72. The existing terminal building has capacity for 250 arriving and 250 departing passengers at a time. Airport Authority of India 4
India-Bangladesh Border Figure 1.1: Location of Agartala Airport on Google Map The details of runway, taxiway, apron, CNS facilities & residential colony at Agartala Airport are as under: Runway: 2286 m x 45 m Apron: To park 3 nos. A-320/A-321 and 2 no. ATR-72 at a time Terminal Building: 500 pax. (250 arriving+250 departing) at a time CNS Facilities: NAV/Comm. Aids like ILS, DVOR, DME, NDB, and VHF ATC control tower cum technical block and fire station of Cat-VII Night Landing Facilities 1.3.1 Land Details The existing airport covers 508.191 Acres, out which operation area of the airport is 465.30 Acres. The land details of the existing airport are as given below: Operation Area 465.30 Acres Non operation Area (City Side of Terminal Building) 8.081 Acres Residential Area 34.81 Acres Total 508.191 Acres 1.3.2 Aerodrome Technical Data The coordinates of exiting airport are 23 53 26 N and 91 14 21 E. Other aerodrome details are as given below: Airport Authority of India 5
Elevation 14.634 m Reference Temperature 33 o C Aerodrome Reference Code 4 C Aerodrome Reference Code Light Rescue Fire Fighting Category Cat-VII Type of Traffic Permitted VFR/IFR Isolation Bay Available (71x 53 m) 1.3.3 Declared Distance The declared distances of Agartala Airpot are as given below: RWY TDRA (TODA) ASDA LDA DISP THR RESA 18 ILS 2286 2286 2286 2152 134 90 x 90 36 2286 2286 2286 2286 NIL 90 x 90 Note: distances are in meter. 1.3.4 Runway Details The existing runway is suitable for operation of A-321/A-320 type aircrafts with night landing facilities. The orientation of runways at Agartala Airport is 18/36. The length of runway is 2286 m with width of 45m. The other details of runway are given below: Orientation 18/36 Dimension 2286 x45 m Basic Strip 2406 x150 m PCN 64 F /D/W/T Surface Bituminous Shoulders 7.5 m 1.3.5 Apron Total apron area at Agartala airport is 23928 sqm (91x71 m, 83x77 m & 156x71m). Apron is suitable for parking of 3 nos A-320/A-321 aircrafts and 2 ATR-72 aircraft. Dimension 91x71 m, 83x77 m & 156x71m totalling to 23928 sqm Capacity 3 nos. A-320/A-321 & 2 ATR 72 Totalling to 23928 sqm PCN 65 R/D/W/T Airport Authority of India 6
1.3.6 Taxiway There are five nos. of taxiway available at the airport. The width of the taxiway is 23m with shoulders of 7.5m on either side. Details of taxiways are as given below: (a) No of Taxiway : 5(A, B, C, D & E) (b) Width : 23 m (c) PCN/LCN : A/B/D/E : 64 F/D/W/T; C: 45R/C/X/U (d) Shoulders : 7.5 m 1.3.7 Ground Lighting Facility The ground lighting facility at the Agartala are given below: (a) Runway Edge Lights : Available (high intensity) (b) PAPI : Available at both the ends (c) Approach Lights : Simple approach at both ends (d) Information & Mandatory sign : Available (e) Apron Flood light : Available 1.3.8 Communication The communication facilities at the Agartala airport are DVOR/ ILS/ DME (RWY- 18) & NAY-AIDS VHF/ATIS. Airport Authority of India 7
1.3.9 Fencing (Operational) Around the airport wall type of fencing has been provided in the length of 12.50 km. Height of wall is 2.88 m. Type : Wall Height : 2.43+0.45 m Length : 12.50 km Perimeter road : Available (10km) Airport Authority of India 8
Chapter 2 Proposed Development At Agartala Airport Airport Authority of India 9
2.1 Master Plan of Agartala Airport The master plan for Agartala Airport is shown in Figure 2.1. 2.2 Proposed Development at the Existing Airport In 2013-14 Agartala Airport handled on an average 2058 passengers per day. The existing terminal building is not capable enough to accommodated increasing numbers passengers at present in future years. Therefore, Airports Authority of India has proposed to design and construct new terminal building for 500 arriving and 500 departing passengers at a time and other works also at the airport. The proposed scope of work for development of Agartala Airport is as under: 2.2.1 Civil Works The scope of work for the proposed civil works at the Agartala Airport is as given below: New Domestic Terminal Building (i) (ii) Construction of centrally air conditioned New Domestic Terminal Building of modular design with all modern facilities and amenities as per the layout plan enclosed. The Domestic Terminal Building with area of 29422 sqm shall be designed for 500 arriving and 500 departing passengers at a time. Construction of car park for at least 500 cars and 10 buses, separate car /scooter park area. (iii) Development of four lane vehicular road from Terminal Building / Car parking with canopy covering two lanes in front of the Terminal Building on the city side and connecting the main approach road to the city. (iv) Horticulture landscaping, drainage system and water supply etc. (v) Driver s canteen and toilet facility on the city side (vi) Sub station, A/C plant room and related service facilities. (vii) Providing city side compound wall with Concertina Coil on top between city side and operational area. B. Construction of Apron for parking of 6 (six) A321/B-737-800/Q-400 type of aircraft and two Taxiways: (i) Construction of apron of approximate area 255m x 88.5m, with shoulders width 7.5 m on three sides. Airport Authority of India 10
(ii) Construction of two link taxiways of length 178 m and 265 m connecting the Runway with the Apron. The width of the taxiways shall be 23m with shoulders of 7.5m on either side. (iii) Provision of drainage system for the apron connecting the main storm water drains and culverts below the taxiways or portions of Apron where ever required. (iv) Provision of hard stand for ramp equipment and three lane service road between the apron and the Terminal Building. (v) Provision of pipe lines for future installation of fuel hydrant system. 2.2.2 Electrical Work The scope of work for the proposed electrical works at the Agartala Airport is as given below: (i) Internal and external electrification for Terminal Building Complex, associated buildings, Car Park and roads. (ii) Provision of water supply pumping arrangement system, Water Filtration, water cooler & R.O/U.V. Filters, Sewage Treatment Plant. (iii) Augmentation of main power supply, Substation Equipments, DG Sets for Secondary Power supply and associated ancillary buildings. (iv) Central air-conditioning with provision of vertical air-conditioning concept. (v) Provision of conveyor belts with on line X-Ray inspection System and other equipments. (vi) Fire detection, alarm and protection system with Fire Control Room. (vii) Building Management System. (viii) Escalators & Elevators with matching staircase. (ix) Provision of four Passenger Boarding Bridges (PBB) for the specified parking stands. (x) Provision of Visual Docking Guidance Systems for parking stands with PBBs and remote nose-in stands. (xi) Provision of Apron Edge Lights, Taxiway Edge Lights, and lighted mandatory information/information Signs, etc. Including cabling works. (xii) Provision of high mast Apron Flood Lights at appropriate locations to meet the required illumination standards along with raising and lowering device for easy maintenance. Airport Authority of India 11
2.2.3 CNS Works The scope of work for the proposed CNS works at the Agartala Airport is as given below: Relocation of NDB, DVOR and Glide Path 2.2.4 IT & Airports Systems Works The proposed development will include IT & Airports Systems Works at the Agartala Airport. 2.3 Land Requirement for Proposed Development The land required for proposed development is as given below : Land Obtained from State Government 71.996Acres Additional Land to be acquire from State Government 4.21 Acres Total land required 76.206 Acres AAI Land Swapped to Rehabilitate Displaced Families 28.000 Acres 2.4 New Domestic Terminal Building At the airport construction of centrally air-conditional new domestic terminal building of modular design with all modern facilities and amenities is proposed as per the layout plan given in Figure 2.1 to 2.2. The domestic terminal building covering an area of 29422 sqm will be designed for 500 arriving and 500 departing passengers at a time with recommended area specifications and to match the level of Service B as per International Airport Transport Association s (IATA) recommendations. The building will be provided with aesthetically appealing & soothing interior decoration matching the modern structure. The area statement for new terminal buildings is as give below: Sn Details Area 1. Ground Floor Area First Ground floor Area Second 2. First Floor Area First First Floor Area Second 7785 sqm (6m) h 4173 sqm (12m) h 192 sqm (3.35m) h 9208 sqm (6m) h 3. Basement Area 8064 sqm (6m) d Total Area 29422 sqm Airport Authority of India 12
2.5 Cutting & Filling For construction of the proposed facilities at the Agartala Airport, tentatively 67930 cum cutting and 276805 cum filling will be required. 2.6 GRIHA Rating It is proposed that all works necessary will achieve 4 stars GRIHA Rating. GRIHA is an acronym for Green Rating for Integrated Habitat Assessment. GRIHA is a rating tool that helps to assesses the performance of their building against certain nationally acceptable benchmarks. It evaluates the environmental performance of a building holistically over its entire life cycle, thereby providing a definitive standard for what constitutes a green building The rating system, based on accepted energy and environmental principles, will seek to strike a balance between the established practices and emerging concepts, both national and international. 2.7 Parking Facilities The car park facility will be provided for at least 500 cars and 10 buses, separate car/ scooter park area. 2.8 Power Requirement Total power requirement is estimated as 2339 kw for new terminal building and other facilities at Agartala Airport. For the power back-up, three DG sets of 1000 kva, each will be provided to meet the power requirement in the event of grid power failure. 2.9 Project Cost The estimated cost of the proposed development at the Agartala Airport is Rs 427.82 Crores. Airport Authority of India 13
Figure 2.1: Master Plan for Agartala Airport Airport Authority of India 14
Figure 2.2: Layout Plan of Propose New Terminal Building at Agartala Airport Authority of India 15
Figure 2.3: Elevation Section of Propose New Terminal Building at Agartala Airport Authority of India 16
Figure 2.4: First Floor Plan for Propose New Terminal Building at Agartala Airport Authority of India 17
Figure 2.5: Ground Floor Plan for Propose New Terminal Building at Agartala Airport Authority of India 18
Figure 2.6: Basement Plan for Propose New Terminal Building at Agartala Airport Authority of India 19
Chapter 3 BMS System for the Proposed Terminal Building Airport Authority of India 20
Chapter 3 BMS System for the Proposed Terminal Building 3.1. HVAC Requirement HVAC System requirement at the proposed terminal building at existing Airport is estimated as 961.11 TR. To meet the air conditioning requirement, three screw chilling tower unit of 350 TR will be installed. Microprocessor based control system (BMS) will also installed at the Airport. 3.2 Design Considerations The system proposal is designed to fulfil the following objectives: Low capital cost. Energy efficient throughout the varying load patterns Minimum power demand. Providing required Indoor air quality (IAQ) with reduced operating cost. Maximum flexibility of operation. Use of highly responsive control system (BMS) to optimize system functioning. 3.3 Capital Cost The selection of equipment is designed to achieve the lowest capital cost consistent with energy efficient modern technology. The choice of equipment and specifications will provide the best possible system at a reasonable price. 3.4 Energy Efficient The air conditioning systems operate between a minimal demand of 40% and up to a maximum demand of 95% for a major part of the year. Hence, the selection proposed is such that the overall power requirement remains consistent with the demand, avoiding all possible waste. Airport Authority of India 21
3.5 Flexibility The use of air cooled chilling units has been proposed instead of water cooled chillers. This will avoid use of cooling towers and condenser water pumps, thereby reducing by nearly 40% the number of equipments which have to be operated and maintained. The chiller will be fitted with air cooling pads to reduce power consumption and save 80% water as compared to water cooled system, the cooling pads will be used whenever Ambient temperature crosses 35 C. The use of air cooled chillers will thus simplify operation and also avoid worrying about availability of water in cooling towers at all times. There will be separate pumps for secondary circuit. In addition each floor will have independent Air handling Units (AHUs). This will ensure that the equipment in operations is as per demand without any wastage of power. 3.6 Control System It is proposed to use microprocessor based control system (BMS) to optimize plant operation and minimize running costs. The various systems are selected carefully to provide maximum benefits at a reasonable cost. The BMS will also be used to integrate other services and control external lighting and monitor other services. 3.7 System design (Ventilation & Miscellaneous) The ventilation of D.G. room and pump will be through the use of axial flow fans on the opposite side. The HVAC plant room will be ventilated using propeller type fans. 3.8 Building Management System (BMS) It is proposed to provide a Microprocessor Based Building Management and control system (BMS) for HVAC system and other services to create an intelligent building. Airport Authority of India 22
Chapter 4 Water Supply, Sewerage, Drainage And Fire Fighting Airports Authority of India 23
Apron & Link Taxiway at Agartala Airport Chapter 4 Water Supply, Sewerage & Drainage 4.1 Introduction The terminal building will have two Ground floors and two first floors. Ground floor is used for air travels facilities like, ticketing, baggage claim, domestic and international arrivals, shopping, public concourse, ticket checking counters and immigration etc. First floor is used for departure lounges, security hold restaurant, and offices etc. According to National Building Code 2005 the complex falls under assembly building as per occupancy. The approximate ground coverage of main building is 12958 sqm. Basement of area covering 8064 sqm is also proposed with terminal building. 4.2 Expected Population per Day at Airport The expected population per day at the Airport is given below: Arriving and Departing Passengers - 3000 Airport staff - 200 Drivers/Visitors - 500 Water required as per National Building Code 2005 Part IX Table 2 is given below. International & Domestic terminal Staff - 70 Litres/Head/Day Air Passenger - 15 Litres/Head Floating population - 15 Litres/Head Airports Authority of India 24
Apron & Link Taxiway at Agartala Airport 4.3 Total Water Required Water requirement for the Agartala Airport is estimated as given below: For Domestic Water Use Air Passengers (3000 x15) - 45000 Litres Staff (200 x70) - 14000 Litres Visitors (500x15) - 4500 Litres Total - 63500 Litres For Crush Fire Tender Water Use - 6 kl For HVAC Use - 50 kl Total water requirement is estimated as 119.5 Kl per day (say 120 kld). The water balance diagram is shown in Figure 4.1. The water requirement for flushing and landscaping will be met through reuse of treated waste water from STP. Therefore, fresh water requirement is estimated as 81.4 kl/d (say 82 kld). HVAC (50 Kl) Consumed Bore Well Water Supply Fresh Water (81.4 kl/d) 38.1 kl/d Water for drinking, hand washing, food, etc. (25.4 kl/d) Treated Water for Toilet Flushing (38.1 kl/d) 2.5 kl/d 22.9 kl/ d 38.1 kl/d STP (61 kl/d) Evaporation (6.1 kl/d) 4 kl/d 54.9 kl/d CFT (6 Kl) 16.8 kl/d Water for Green Belt & Landscaping by Sprinkler Irrigation (16.8 kl/d) 54.9 kl/d Treated Water Storage Tank Figure 4.1: Water Balance Diagram for Agartala Airport Airports Authority of India 25
Apron & Link Taxiway at Agartala Airport 4.4 Sources of Water Water requirement will be met through tube wells already available at the Agartala airport. 4.5 Sanitary Fixtures And Toilet Accessories Water Closet: All water closets will be wall hung with concealed dual flushing cistern and in lodders and staff toilets WC will be provided with dual flushing cistern. Under counter/ circular above counter wash basins with battery operated auto sensor pillar taps will be provided. Flat back wash basins with CP brass self closing pillar tap will be provided in lodders and staff toilets. Semi stall urinal with battery operating auto sensor flush valves. Frosted Glass urinal portion with metal clips. CP adjustable shower with Diverter and spout in rest room's and VIP toilet. Vitreous china recess toilet paper holder. Automatic soap dispenser on wash basins (Stainless steel). Automatic air purifier (Stainless steel). Toilet tissue paper holder (Stainless steel). Automatic electrically operated hand drier (Stainless steel). 4.6 Water Distributions Pipe and Fittings G.I. / composite Pipe and fitting for hot and cold water. Heavy class G.I. pipe and fitting in shaft and under floor. All external under ground water pipe will be cast iron Class LA conforming to IS:1536 with specials and lead joints. 4.7 Sewerage Treatment and Disposal As per water balance diagram, 61 kl/d sewage will be generated after the operation of new terminal building which will be treated in STP of capacity 75 kl. 4.8 Sewage Treatment Plant Sewage generated from the airport will be treated in well designed Sewage Treatment Plant (STP). It is proposed to installed Moving Bed Biofilm Reactor (MBBR) type sewage treatment plant of 75 kl capacity. Airports Authority of India 26
Apron & Link Taxiway at Agartala Airport Design of STP Approximately 61 kl per day sewage/waste water will be generated from the proposed airport. Sewage will be collected and treated in well-designed sewage treatment plant. After meeting stipulated standards, treated waste water will be utilized for flushing purpose, irrigation of greenery and landscaping. Details of Sewage Treatment Process The sewage from the proposed airport shall be collected by gravity into the collection tank/equalization tank of Sewage Treatment Plant (STP) via perforated screens to prevent the large particles into system. In equalization tank, ph and temperature of incoming sewage will be equalized. The sewage from equalization tank will be pumped to Moving Bed Biofilm Reactor (MBBR) reactor for biological treatment, where required quantity of air in presence of MBBR system will be supplied to meet the oxygen requirements by mean of blower and fine bubbles air diffusers. After MBBR reactor, sewage will flow by gravity to settler (tube type) where sludge will be settled at the bottom due to gravity. This settled sludge will be recycled through sludge pump to MBBR reactor to meet the mixed liquor suspended solids (MLSS) requirement, excess sludge will be discharged through filter press for final disposal. Final discharge of waste water from settler will be collected in chlorine contact tank, where some chlorine will be dosed for disinfections of treated waste water. Then, treated sewage will be pumped for tertiary treatment through duel media filter or it will be passed through or it will be passed through Ultraviolet (UV) disinfection system. Treated sewage will meet the norms prescribed by Gujarat Pollution Control Board and will be utilized for flushing, HVAC and for irrigation of greenery & landscaping purpose. Treated wasted water will not be discharged out side the boundary of proposed airport. Design Parameters Design parameters for proposed STP are given below: Sl. Parameters Inlet Outlet 1. BOD 300 mg/l Less than 20 mg/l 2. COD 400 mg/l Less than 150 mg/l 3. Oil & Grease 50 mg/l Less than 10 mg/l 4. TSS 200 mg/l Less than 50 mg/l 5. PH 6.5-8.5 mg/l 6.5-8.5 mg/l Airports Authority of India 27
Apron & Link Taxiway at Agartala Airport No treated waste water will be discharged outside the airport. Unit wise description of the proposed STP is given below and shown in Figure 4.2: Screen Chamber Prior to the actual treatment of the wastewater, a screen chamber will be provided. In this chamber removable type mechanical bar screens will be provided for removal of various large size elements, such as paper, cloth, plastic etc, etc, which may hamper the satisfactory functioning of subsequent units of the STP, if not removed at early stages. Oil & Grease Trap The oil & grease trap will be provided to collect oil and grease trace coming with sewage. Collected oil & grease will be stored in a drum and disposed of in environmental sound manner. Equalization Tank As the quantity of the flow is non-uniform in nature, an equalization tank will have to be provided. By the provision of an equalization tank, wastewater characteristics will become homogeneous in nature and, therefore, better treatment can be achieved in the subsequent units of the STP. Diffused aeration will be provided in this tank to stir the contents of the tank completely. MBBR Reactor (Biological Treatment) Moving Bed Biofilm Reactor (MBBR) technology employs thousands of polyethylene biofilm carriers operating in mixed motion within an aerated wastewater treatment basin. Each individual bio carrier increases productivity through providing protected surface area to support the growth of heterotrophic and autotrophic bacteria within its cells. It is this high-density population of bacteria that achieves high-rate biodegradation within the system, while also offering process reliability and ease of operation. This technology provides cost-effective treatment with minimal maintenance since MBBR processes self-maintain an optimum level of productive biofilm. Additionally, the biofilm attached to the mobile biocarriers within the system automatically responds to load fluctuations. Airports Authority of India 28
Apron & Link Taxiway at Agartala Airport The bacteria/activated sludge grow on the internal surface of the carriers. The bacteria break down the organic matter from the waste water. The aeration system keeps the carriers with activated sludge in motion. Only the extra amount of bacteria growth, the excess sludge will come separate from the carriers and will flow with the treated water towards the final separator. The system can consist of a one stage or more stage system (see underneath schedule), depending on the specific demands. The specific bacteria remain in their own duty tank because of the fact that the carriers remain in only 1 tank, protected by screens. A bio-film develops on the media, which move along the effluent sewage in the reactors. The movement within the reactors is generated by providing aeration with the help of diffusers placed at the bottom of reactors. This thin film on the media enables bacteria to act up on the bio-degradable matter in the effluent sewage and thus reduce the BOD/COD content in presence of oxygen from the air used for fluidization. Aeration will be done with the help of twin lobe blowers. The MBBR reactors will increase the oxygen content of the sewage and thus, will help in the growth of the micro-organisms required to reduce the BOD. These micro-organisms will consume the organic matter and will convert it into active biomass, better known as sludge. The waste water, laden with sludge, will be transferred to tube settler for sludge separation. Secondary Settling Tank Followed by Pre filtration Tank The sludge formed will settle in the secondary settling tank followed by pre filtration tank. The settled sludge will be discharged in the Sludge Collection Tank and would be dewatered using sludge press. The clear supernatant from the outlet of the tube settler will be discharged as treated waste water and will be passed on to further treatment for final polishing. HDPE/PVC low maintenance tubes will be provided for trouble free operation of the tube settler. Sludge Filter Press The sludge from the settling tank of the STP will be collected in the tank and will be treated in the sludge press. This will be 24 plates CI sludge press completes with its pump and accessories. In sludge press, the sludge in the form of liquid slurry is fed into the press and dry solid cake of sludge is taken out from it. These dry cakes are used as manure for green belt and landscaping. Airports Authority of India 29
Apron & Link Taxiway at Agartala Airport Pressure Sand Filter For final polishing of the treated waste water, a Pressure Sand Filter (PSF) will be provided. The PSF comprises of a MS Vessel having filtering media sand topping for filtration of supernatant treated sewage water and thus ensuring clarity of water. Activated Carbon Filter For tertiary treatment, an Activated Carbon Filter (ACF) will be provided. This will be MS constructed tank in which activated charcoal/carbon will be filled as adsorbing media. This will not only adsorb impurities but will also act as the polishing tank for the final treated waste water. The resultant water shall be clear, odourless and will be reused for horticulture purpose. Ultraviolet (UV) Disinfection System Ultraviolet (UV) disinfection will use a UV light source. UV-rays are energy-rich electromagnetic rays that are found in the natural spectrum of the sunlight. They are in the range of the invisible short wave light having a wavelength ranging from 100 to 400 nm. UV light source is mounted so that water can pass through a flow chamber, and UV rays are admitted and absorbed into the stream. When ultraviolet energy is absorbed by the reproductive mechanisms of bacteria and viruses, the genetic material is rearranged and they can no longer reproduce. They are therefore considered dead and the risk of disease has been eliminated. UV plant will have following features: Stainless steel construction Single lamp Long life of the UV Lamp Airports Authority of India 30
Apron & Link Taxiway at Agartala Airport Figure 4.2: Schematic Diagram for MBBR Based STP 4.9 Rain Water Harvesting Rainwater harvesting system for proposed terminal building will be developed based in Central Ground Water Board (CGWB) Guidelines and Construction Manual of Ministry of Environment, Forest and Climate Change (MoEF&CC), Government of India. Design details of rainwater harvesting system are given below: Total Terrace Area - 11958 sqm Peak hourly rainfall - 45 mm Runoff Coefficient for Terrace - 0.85 Peak Flow for Terrace - 11958 x 0.85 x 0.045 457.39 m 3 /hr Average throughout using 300 dia pipe with flow velocity of 0.15 m/sec. - 38.15 m 3 /hr say - 38 m 3 /hr No of pits based on 38 m3/hr - 11.9 Nos, say 12 Pits However, provision for 15 nos. of rainwater harvesting pits have been kept including parking area. The cross section of rainwater harvesting pit is given in Figure 5.3. Airports Authority of India 31
Apron & Link Taxiway at Agartala Airport Figure 4.3: Typical Cross Section of Rain Water Harvesting Pit Airports Authority of India 32
Apron & Link Taxiway at Agartala Airport Chapter 5 Solid Waste Management Airports Authority of India 33
Apron & Link Taxiway at Agartala Airport 5.1 Solid Waste Generation It is estimated that approx. 190 kg/d solid waste will be generated from the airport. From the new terminal building, waste will be generated in the form of paper, plastics, polyethylene bags, and food waste, etc. 5.2 Solid Waste Management The following measures will be taken for management of solid waste during operation phase of proposed airport. Solid wastes management will be carried out as per Municipal Wastes (Management and Handling) Rules, 2000. Wastes shall be collected in designated waste bins based on their types, placed at the strategic locations. The solid waste handling and disposal services will be outsourced to authorized agency to ensure disposal of solid waste generated from the proposed airport. Solid waste generated in the aircrafts will also disposed off at the designated waste collection points from where the agency will pick up the garbage bags. The agency will collect the garbage from designated bins, which will be spread over the area of proposed airport. The wet garbage of the aircrafts comprising of left over food in the tray from the security gates of flight kitchens will be disposed off at the specified places. The collected garbage will be transported in covered container and will be arranged to dispose off after segregation of recyclable wastes as per provisions of Municipal Wastes (Handling & Management) Rule 2000. After collection of garbage, garbage bins will be disinfected every day by sprinkling disinfectant powder by the agency. Weekly washing of garbage bins will also be carried out by this agency. After collection of waste, solid waste management plan to be followed by authorized agency is as given below: Segregation of recyclable and non recyclable wastes. Disposal of recyclable wastes for recycling. Composting of biodegradable organic of wastes for captive use Disposal of segregated wastes to common municipal waste landfill Site Airports Authority of India 34
Apron & Link Taxiway at Agartala Airport Chapter 6 Energy Conservation Airports Authority of India 35
Apron & Link Taxiway at Agartala Airport 6.1 Energy Conservation Measures During design and construction of new terminal building at the Agartala airport necessary measures will be taken for conservation of energy in line with Energy Conservation Building Code 2006 and National Building Code 2005 The important energy conservation measures proposed for new terminal building are described below: Airport Terminal building will be designed and constructed for GRIHA Rating 4 star, Use of Energy Efficient building material & glass, Use of LED lamps instead of GLS lamps, Use of Solar Backed up Light Emitting Diode Lamps instead of par lamps, Energy efficient HVAC system, Solar passive techniques for terminal building, Use of 5 star BEE energy efficiency rating electrical equipments, Microprocessor-based Building Management System (BMS) will be installed for minimization of energy consumption, Automatic lighting on/ off control system will be provided in the airport area for optimum utilization of energy. It is proposed that 100 KW solar power generation plant will be established at the airport to produce clean energy. By adopting above measures about 30% energy will be saved. Airports Authority of India 36