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What about its physical setting? Gravity conveyance is made possible through terrain analysis culminating in an optimised network configured to minimise network pumping. Sewer routing and sizing could be done in a manner which maximises connection potential taking into consideration plants to be rationalised and future areas planned for sub-division and development. Highly built-up nature of a project area will pose encumbrances in the course of sewer construction, posing risks to other buried utilities and properties while impeding traffic movement, posing delays in sewer network implementation and inability to coincide with the construction of the centralised plant. To mitigate this, sewers can be constructed using trenchless methods which included curved pipe jacking.


Manhole construction


AN INTERVIEW WITH THE SEWERAGE CONVEYANCE SYSTEM CONSULTANT


How does a sewage treatment project take into account its environmental and social settings? The ambient environment will be affected from construction activities especially at pump station water


sites, which quality, air MOHD FAUZI SULEIMAN


Since 1988, Fauzi has been providing engineering and environmental consultancy including design, planning and coordination of water supply, sewerage, solid waste and drainage infrastructure as well as in the conduct of


Environmental Impact Assessments (EIA) for various types of industry, land reclamation and housing development. He was involved in the consultancy of the Sewerage Conveyance System of the Langat Sewerage Project.


include quality and noise


level. Mitigation measures incorporated comprise sediment basins and traps and wash troughs, hoardings and strict regulation of work hours.


Townhall


meetings need to be regularly held to inform the concerned public of


the


project, its objectives and benefits, construction mitigation measures as well as the communications plan to address public complaints.


What is a common constraint in a sewage network treatment project? For the network, manhole spacings and sewer depths recommended in the existing


MSIG [Malaysian Sewerage


Industry Guidelines] guidelines could pose as major constraints. While being applicable to small individual housing schemes, these guide limits are not applicable


to municipal or regional


systems. The concept of rationalisation, i.e., connection of inflows into existing small sewage treatment plants


will


rarely, if at all, require property level connections (shorter manhole spacings and shallower depths). Contractors may counter-propose wider spacings between manholes and greater sewer depths based on the sewer diameter.


How do you procure and stage equipment in order to reduce costs and improve efficiency? Where sewers are concerned, priority was given to the first-stage implementation of a portion of the approved network which maximises connectivity to the centralised plant, to coincide with the liquid and solid tests prior to operation. Pump stations were designed taking stock of the latest technology governing pump performance, control systems and odour control.


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