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PROJECTS


Aerial view


plants and it has been associated to sewage treatment plants discharging ammonia. Due to this, the non-compliance of nearby sewage treatment plants located upstream and high ammonia content in the above-mentioned rivers has caused water contamination at the Bukit Tampoi water intake point resulting in plant shut down and water crisis. As such, removing or stripping the ammonia will help to reduce the impact. However, a more holistic approach is needed whereby all other sources of pollution resulting in ammonia generation needs to addressed and resolved.


This project is needed in order to improve and to achieve better standard of treated effluent by complying with Category 1, Environmental Quality Act 1974, Environmental Quality (Sewage) Regulations 2009, Second Schedule (Regulation 7) – Effluent Standard ‘A’.


REGIONALISATION The study demarcated an area of approximately 80 square kilometres in the rapidly urbanising Cheras-Kajang corridor. This catchment area includes 232 small discrete sewage treatment plants, serving individual housing estates and numerous institutional premises. A majority of these plants, built decades earlier, was not designed to effectively reduce


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ammoniacal nitrogen loads into Sungai Langat. As such, the operations of water treatment plants that drew raw water from the river were compromised.


The proposal embodies the concept of regionalisation of the sewerage infrastructure. This is done by diverting raw sewage entering each of the small plants, and from identified government premises and schools, into larger municipal sewers. These would then all lead to a centralised and more extensive sewage treatment facility.


The concept involved a conveyance system comprising 98 kilometres of gravity sewers, 11 network pump stations with a corresponding 10 kilometres of force mains. The network culminates in a centralised municipal plant with a hydraulic capacity of 207 MLD [million litres per day]. The capacity and the sludge process of the centralised plant are designed to effectively strip ammoniacal nitrogen while meeting all requisite parameter discharge limits stipulated under Category 1, Environmental Quality Act 1974.


PROJECT SCOPE The scope comprises major structures and connections. The first is a conveyance concept with optimum use of


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