PRESENTED BY: IR. TAI LEE YOON JURUTERA JASA (SARAWAK) SDN BHD

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Matilda Jenkins
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1 PRESENTED BY: IR. TAI LEE YOON JURUTERA JASA (SARAWAK) SDN BHD

treated blackwater and untreated greywater is a major contributor of

2 PRE-PROJECT SITUATION Black water is partially treated by septic tanks. Grey water is directly discharged into the drains and river system Partially treated blackwater and untreated greywater is a major contributor of pollution to Sg Sarawak SgSarawak is currently classified as Class III (Class V for E. Coli)

3 KuchingWastewater Management System (KWMS) KWMS is implemented mainly to improve sanitary & public health ToimproveandmaintainthewaterqualityofSgSarawaktoClass IIB or better Black and grey water will be collected and treated Main components - centralised sewage treatment plant - sewer network - property connection

4 KWMS MASTERPLAN WWTP for Zone 1 WWTP for Zone 3 WWTP for Zone 2 Strategy: Implement Zone 1 first due to densest population

MASTERPLAN FOR ZONE 1 Trunk sewer of 270,000 PE (P2)

Strategy : - i) Build the 2 sewer spines & WWTP

5 MASTERPLAN FOR ZONE 1 Trunk sewer of 270,000 PE (P2) Trunk sewer of 270,000 PE (P1) Zone 1 Master Plan : - i) 2 trunk sewer spines to cater for 20 years ii) WWTP - 4 modules of 100,000 PE plant Master Plan Strategy : - i) Build the 2 sewer spines & WWTP first ii) All new development to connect at developer s cost

6 PROJECT AREA LAYOUT PLAN

7 TRUNK SEWER SYSTEM

8 DEEP TRUNK SEWER SYSTEM Only 1 Pumping Station located Tun Salahuddin Bridgeat WWTP Gravity 27 meters Gravity system Deeper firmer ground conditions Only 25% energy consumption compared to pumping stations method Least disturbance & safer to people and existing utilities

9 Construction Method For Trunk Sewer Jacking Shaft Receiving Shaft

10 Geology and Subsurface Conditions of Site

Tun Salahuddin Bridge Under river jacking was completed on 31 st

25 Under river pipe jacking tunnel (280m long) 20m below ground, 3m-5m under river bed Jacking Shaft T6 Receiving Shaft T7A Sungai Sarawak Tun Salahuddin Bridge Under river jacking was completed on 31 st March 2011 after a period of 1 month Main trunk sewer Pending, Kuching

26 SECONDARY AND TERTIARY SEWER SYSTEM

27 SECONDARY & TERTIARY SEWER SYSTEM Pipesdeeperthan2.5mwillbelaidbytrenchlessmethod. Shallowersewer(lessthan2.5m)willbelaidbyopencut. Construction by trenchless construction Construction by open cut

Details of Sewer Pipe sizes ranging from:

28 Details of Sewer Pipe sizes ranging from: mm ID, 1200 mm ID for Trunk Sewer mm ID and 450 mm ID for Secondary Sewer mm ID and 225 mm ID for Tertiary Sewer Pipe materials used, includes: - Reinforced Concrete pipe - Corrugated HDPE pipe

29 Pipe laying

32 SEWER APPERTUNANCES

33 Typical Manhole Details Generally, manholes shall be provided at -change of direction of sewer - intersections of sewer - changes in pipe diameter -upstream end of sewer

34 Drop manholes shall be provided when:- Typical Drop Manhole Details For pipes < 450mm dia. drop between incoming and outgoing pipes exceed 1.0m For pipes >= 450mm dia. drop between incoming and outgoing pipes exceed 1.5m

35 Typical Vortex Drop Details Vortex drop to be provided when drop between incoming and outgoing sewers exceed 6m.

36 Installing precast manhole base slab

37 Installing precast manhole wall

38 Benching construction

39 Manhole precast top piece installation

40 Cover make-up piece casting

41 Manhole cover installation

42 Completed manhole

43 Perspective Plan of Package 1 WWTP

44 MASTER PLAN FOR WWTP SITE

45 Details of WWTP - Activated sludge system employed. - Proven and robust technology. - Ensure Standard A discharge complying with Second Schedule of EQA of the EQRM (2007) - Effluent discharge into Sg. Sarawak. - Sludge treated and sent for disposal at Mambong Sanitary landfill.

46 Treatment Performance Parameter Unit Influent Value Effluent Value Biochemical oxygen demand, mg/l BOD 5 Chemical oxygen demand, mg/l COD Cr Total suspended solids TSS mg/l Total nitrogen N tot mg/l Total phosphorus P tot mg/l 8.8 5

47 SCHEMATIC OF TREATMENT PROCESS

48 WASTEWATER TREATMENT PLANT

49 PROPERTY CONNECTION With completion of WTP, property connection works commence Property connection works involve entry to each individual property to connect up the black and grey water pipes PR campaign to inform public of the benefits of system and upcoming connection works commence

50 SEQUENCE OF WORKS PROJECT START WASTEWATER TREATMENT PLANT COMPLETION Soft PR exercise required TRUNK SEWER COMPLETION SECONDARY AND TERTIARY SEWER COMPLETION PROPERTY CONNECTION Intensive PR exercise required

51 NO. OF PROPERTY CONNECTIONS o Large Properties : 127 nos. o Shophouses/ Commercial Lots : 1,924 nos. o Residential Properties : 782 nos. 2,833 nos. 51

52 Typical house connection (gravity system)

53 PHOTOS OF TYPICAL PROPERTY CONNECTIONS SMK Pandungan (School) SMK Pandungan (School) Prudential Building(Office) Wisma Chinese Chamber (Office) Sk St Theresa (School) Sk Song Kheng Hai (School)

54 THE END Thank You

EPA Waste Water Discharge Licence Application

Duleek Waste Water Treatment Works EPA Waste Water Discharge Licence Application ARTICLE 16 COMPLIANCE REQUIREMENTS Meath County Council EPA Document Ref: D0133-01 Section A: Non-Technical Summary Update