d e w a t s Effluent Laboratory Test Results Decentralized Waste Water Treatment System Bremen Overseas Research and Development Association

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Cuthbert Leonard
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Effluent Laboratory Test Results d e w a t s Effluent quality during first month of dewats operation [mg/l] 515 600 600 500 500 400 250 [mg/l] 400 300 250 200 90 300 100 15 200 90 0 01.10.98 16.10.98 100 15 0 01.

Inlet Outlet Reduksi 1 Suhu C <30 - - - 2 BOD mg/l 30 57 28 50,88% 3 COD mg/l 80 138 46 66,67% 4 TSS mg/l 30 44 13 70,45% 5 NH 3 bebas mg/l 0,1 0,37 0,09 75,68% 6 PO 4 mg/l 2 5,7 2,42 57,54% 7 ph

1 Effluent Laboratory Test Results d e w a t s Effluent quality during first month of dewats operation [mg/l] [mg/l] COD 17,5 45 BOD TSS 22 COD , BOD 5 4 TSS Laboratory result of treated wastewater Decentralized Waste Water Treatment System No Parameter Satuan Kadar Hasil Analisa Maks. Inlet Outlet Reduksi 1 Suhu C < BOD mg/l ,88% 3 COD mg/l ,67% 4 TSS mg/l ,45% 5 NH 3 bebas mg/l 0,1 0,37 0,09 75,68% 6 PO 4 mg/l 2 5,7 2,42 57,54% 7 ph 6,0-9,0 7,48 7,45 - Note: BOD: Biologycal Oxygen Demand, COD: Chemical Oxygen Demand, TSS: Total Suspended Solid, NH3:Amoniak, PO4: Phosfat dewats Projects are supported by Commission of the European Union (CEU) Federal Ministry for Economic Cooperation and development of Germany (BMZ) Free Hanseatic city of Bremen (LafEz) Bremen Overseas Research and Development Association Industriestr 20 D28199 Bremen Germany Phone: office@borda.de Fax: Bremen Overseas Research and Development Association

Overview Construction Costs (Approximately) Examples of prices ($ / m³) for dewats treatment volume $575 $489 $365 $226 $247 Appropriate wastewater treatment for communities, small and medium

2 Overview Construction Costs (Approximately) Examples of prices ($ / m³) for dewats treatment volume $575 $489 $365 $226 $247 Appropriate wastewater treatment for communities, small and medium enterprises dewats project aims to support communities & SME in planning, designing, and constructing of effective, efficient, and cost-efficient appropriate wastewater systems based on a modular, partly standardized technical design. dewats technology applications provide state-of-the-art technology at affordable prices because most of materials/input used for construction are locally available. Islamic Hospital, Wonosobo - Central Java Graha Asih Hospital, Kuta - Bali Bhakti Yudha Hospital, Depok - West Java Jantung Hospital, Padang - West Sumatra Alam Jaya III Settlement - Tangerang The advantages of dewats technology: Providing treatment for both, domestic and industrial wastewater. Providing treatment for wastewater flows from m 3 per day Reliable and long lasting applications, tolerant towards inflow fluctuation Do not require sophisticated maintenance Low maintenance cost Wastewater pollution reduced by up to 90 % Ground water is not polluted Biogas production Long desludging intervals Due to these advantages, dewats technology is an effective, efficient and affordable solution for community wastewater treatment. Typical dewats cost factors for 100 m 3 anaerobic filter reactor Factors Cost $ % Building Materials Sand, Cement, Concrete, Iron, Stone, Pipes, Plats, Filter material Labour Total

Implementation Demand dewats implemented in four steps: Seminar and workshop

wastewater treatment & dewats technology.

Communities, Small and Medium Enterprises are often not able to meet high

hand information about all important aspects related to wastewater

Construction and supervising Construction is the most important part in

Wastewater discharged is treated appropriately in this section.

3 Implementation Demand dewats implemented in four steps: Seminar and workshop Potential clients are encouraged and informed about the importance of wastewater treatment & dewats technology. Common wastewater problems within communities and small & medium enterprises Communities, Small and Medium Enterprises are often not able to meet high investment and maintenance cost required for sophisticated wastewater treatment system. Feasibility study On-site surveys by dewats experts: Collection of first hand information about all important aspects related to wastewater treatment, which then be transformed into project proposal. Construction and supervising Construction is the most important part in dewats technology. Wastewater discharged is treated appropriately in this section. Maintenance of sophisticated wastewater treatment system are found to be difficult due to low human resources. Low maintenance and operation of wastewater treatment system are required to avoid problems during operation. Wastewater treated does not meet wastewater discharge standard regulation. Monitoring dewats project is responsible for monitoring and maintaining the wastewater treatment system for a generate period of 12 months. A combination between wastewater treatment system and landscape is required to achieve environmental friendly communities, small and medium enterprises

dewats Technology Principles Construction A combination of low-maintenance based technology Wastewater discharged is treated to meet wastewater discharge standard Biogas

sludge from aerobic treatment tanks, liquid animal excreta and excrements Basically principled on sedimentation tank in which settled sludge is stabilized by anaerobic

by forcing incoming wastewater to pass through active bacteria sludge in each compartment.

of active bacterial mass Sedimentation biodigester Optionally constructed and integrated with Baffle Reactor Brick construction, fully waterproof, and airtight plastering

solid based on up-flow principle Simple, durable, easy to maintain Underground construction, little permanent space required Effective, efficient, and low cost

above ground No nuisance odor High treatment efficiency Horizontal sand filter Provides continuous oxygen supply to the upper layers Treatment by permanently soaked sand

4 dewats Technology Principles Construction A combination of low-maintenance based technology Wastewater discharged is treated to meet wastewater discharge standard Biogas digester Basic septic tank Baffled up-flow reactor Anaerobic filter reactor Half-ball-shaped fixed dome plant Suitable for rather thick and homogenous substrate like sludge from aerobic treatment tanks, liquid animal excreta and excrements Basically principled on sedimentation tank in which settled sludge is stabilized by anaerobic digestion Mechanical treatment by sedimentation Biological treatment by contact between fresh water and active sludge compete with each other in the septic tank Treatment by forcing incoming wastewater to pass through active bacteria sludge in each compartment. The settler in front prevents larger solids to enter the baffle section Treatment of non-settleable and dissolved solids by bringing them in close contact with a surplus of active bacterial mass Sedimentation biodigester Optionally constructed and integrated with Baffle Reactor Brick construction, fully waterproof, and airtight plastering Biogas produced as renewable energy source Functioned as settler for Black Water Baffle reactor and anaerobic filter Anaerobic degradation of suspended and dissolved solid based on up-flow principle Simple, durable, easy to maintain Underground construction, little permanent space required Effective, efficient, and low cost maintenance BOD reduction up to 90% Horizontal sand filter Aerobic-facultative-anaerobic degradation of dissolved and fine suspended solids Pathogen removal No wastewater above ground No nuisance odor High treatment efficiency Horizontal sand filter Provides continuous oxygen supply to the upper layers Treatment by permanently soaked sand or gravel filter with water and operates partly aerobic, partly anoxic, and partly anaerobic Aerobic ponds Aerobic degradation High pathogen removal rate Simply constructed Naturally & environmentally reliable in performance Provide possibilities for pleasant landscaping

DEWATS- Decentralized Wastewater Treatment Systems

DEWATS- Decentralized Wastewater Treatment Systems Demand-based technical solutions to reduce water-pollution by small and medium enterprises and settlements in densely populated areas About DEWATS DEWATS