CONCEPT PAPER

1 GREATER KARACHI SEWERAGE PLAN S-III

1. PROJECT: Greater Karachi Sewerage Plan (S-III) 2. LOCATION: Karachi 3. SPONSORING AGENCY: Local Government Department, Govt. of Sindh 4. EXECUTING AGENCY: Karachi Water and Sewerage Board (KW&SB) 5. COST: Rs. 36,117.459 Million 6. SOURCES OF FINANCING: Government of Pakistan (GoP) & Government of

Sindh (GoS) @ 50% : 50% Basis (AS PER ORIGINAL PC-I) 7. BRIEF DESCRIPTION OF THE PROJECT: Greater Karachi Sewerage Project (S-III) is aimed towards improving environmental & sanitation conditions of Karachi through a well-integrated system of collection, treatment and disposal of sewage. The existing sewage disposal system lacks Treatment facilities and requires conveyance network for the sewage to divert it to the treatment plants which are currently being disposed off into sea. ADMINISTRATIVE APPROVALS PC-I of the Project was approved by ECNEC at a cost of Rs. 7,982 million on September 19, 2007 on cost sharing of 50:50 between GoP and GoS. Revised PC-I for an overall cost of Rs. 36,117.459 Million is approved by ECNEC on February 7, 2018, as per following details;

Lyari River Basin: Rs. 21,317.493 Million Malir River Basin: Rs. 14,799.966 Million

Administrative Approval of Revised PC-I is issued on 6th March 2018. Executing Agency: Karachi Water and Sewerage Board The Engineer: Techno Consult International (Pvt.) Ltd. (Lead Firm) in association with WS Atkins International U.K and NEC Consultants (Pvt.) Ltd, Karachi. Contractor: Pak Oasis Industries (Pvt.) Ltd

CONCEPT PAPER

2 GREATER KARACHI SEWERAGE PLAN S-III

SCOPE OF S-III PROJECT UNDER REVISED PC-I The project encompasses the transmission of flowing sewage in Lyari and Malir River Basin through underground RCC Conduit and its treatment at Sewage Treatment Plants, before its ultimate disposal into the sea. Vide Revised PC-I of “Greater Karachi Sewerage Plan S-III Project” following works were envisaged to be executed in Malir & Lyari River Basin along with enhancement and construction of Treatment Plants:

Malir Trunk Sewer : 05 Contract Packages with overall length of 22.74 KM Lyari Trunk Sewer : 08 Contract Packages with overall length of 33.32 KM Upgradation & Capacity Enhancement of Sewage Treatment Plant at Haroonabad SITE from 51 to 100 MGD. Upgradation & Capacity Enhancement of Sewage Treatment Plant at Mauripur from 54 to 180 MGD. Construction of New Sewage Treatment Plant at Korangi of 180 MGD.

SEWAGE TREATMENT PLANT NO. III AT MAURIPUR Existing TP-III is situated at Mauripur, Karachi (24˚ 51’ 40” N - 66˚ 57’ 08” E). The treatment plant was designed by Balfours Engineering Consultants from United Kingdom (UK) and constructed by China Petroleum Engineering Construction Corporation for hydraulic capacity of 54 MGD in 1998 which was operational for 10 years with gradual reduction in treatment capacity. TP-III is located on the shore of Lyari Estuary, in the northeast of Karachi. Part of the site area has been reclaimed from the sea. The treatment plant covers an area of 300 acres of land. It is 3,500 meters long from east to west, and 700 meters wide from south to north. Based on the topographic features and treatment process the existing plant is divided into two parts east and west. The sewage flows from Lyari Trunk Sewer to Mauripur Trunk Sewer and then finally comes into Mauripur Sewage Treatment Plant. Existing TP-III consists of Main Pumping Station, Raw Sewage Channels, Inlet Works, Secondary Pumping Station, Anaerobic Lagoons, Facultative Lagoons, General Pumping Station and Sludge Drying Lagoons. Upon completion of Stage-I of works under S-III Project current treatment facility consisting of lagoons have been upgraded from 54 MGD to 77 MGD, after completion of Stage-II works, another 103 MGD will be treated under new Trickling Filter process, thus making the overall treatment capacity of 180 MGD at TP-III. The Stage-I works at TP-III is completed well within the awarded cost of Rs. 1,512.60 Million.

CONCEPT PAPER

3 GREATER KARACHI SEWERAGE PLAN S-III

PROPOSED LAYOUT OF SEWAGE TREATMENT PLANT NO. III AT MAURIPUR

EXISTING PROCESS FLOW DIAGRAM

Head Works Influent Sewage

Raw Sewage Channels

Detritors

Fine Screens

To Sea

Sludge Drying Beds

Dried Sludge to Disposal

Secondary Pumping Stations

Anaerobic Ponds

Facultative Ponds