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Maynilad Water Services, Inc., better known as Maynilad, is the water and wastewater services provider of cities and municipalities that form the West Zone of the Greater Manila Area in the Philippines. It is an agent and contractor of the Metropolitan Waterworks and Sewerage System (MWSS). [1]
The vast majority used flush toilets connected to septic tanks. Since sludge treatment and disposal facilities were rare, most effluents were discharged without treatment. [26] Within the entire country, septic tanks are the most common method of sewage treatment. In Metro Manila alone, about 75 local companies provide tank-desludging services ...
A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). [2]
Desludging trucks of Manila Water in 2012. Manila Water Company, a publicly listed company and a subsidiary of Ayala Corporation, holds the exclusive right to provide water and used water services to over six million people in the Manila Water Concession, particularly the East Zone of Metro Manila and Rizal Province consisting of 23 cities and municipalities.
Onsite sewage facilities (OSSF), also called septic systems, are wastewater systems designed to treat and dispose of effluent on the same property that produces the wastewater, in areas not served by public sewage infrastructure. A septic tank and drainfield combination
If there is a suitable septic tank in place, pumping the effluent from the tank is the lowest cost option for initial costs. Whether the septic tank is the lowest cost option over time depends on the cost of electricity in the area, how often the tank must be emptied and how much it costs to have the solids pumped out of the tank.
[21] the water service area in Manila was divided in two zones, to facilitate performance comparisons ("benchmarking"), based on the model of Paris which at that time was served by two private water companies. There was debate about the decision to split the service area as it was complicated, including personnel, assets and the customer database.
Gravity separation of solids is the primary treatment of sewage, where the unit process is called "primary settling tanks" or "primary sedimentation tanks". [17] It is also widely used for the treatment of other types of wastewater. Solids that are denser than water will accumulate at the bottom of quiescent settling basins.
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