![]() ![]() ![]() This system is universally used nowadays because of the following advantages. The storm water may be disposed of separately or combined with sanitary sewage. The garbage is collected separately as in conservancy system. The quantity of water is so high (99.9%) that wastes becomes liquid which is carried by the sewers. In this system water is used as a medium to carry wastes to the point of final disposal. The sewage is conveyed openly and is not properly disposed of causing risk of epidemic. The liquid wastes from lavatories may seep into the ground polluting groundwater. Storm water following in open drains cause unhygienic condition in the area. It is highly undesirable to allow night soil carts to pass through roads of the city. The night soil trenching ground required large areas of disposal. If the labour goes on strike the system totally fails. The night soil is carried once in 24 hours while it becomes insanitary after 5-6 hours causing bad smell and fly nuisance. The lavatory has to be built away from the residential building which causes inconvenience. The system has less initial cost but the maintenance cost is high because of working labors. This system has the following disadvantages. This system is obsolete now and can be used in rural areas where there is scarcity of water. The human and animal waste are also called night-soil.Ĭ.The storm water is conveyed separately by close and open channels and discharge into natural streams. The human and animal waste (feces and urine) are collected in pans from lavatories and is then carried by labors in carts or lorries for disposal outside the city where it is buried for manure. The former is burnt and the later is buried in low lying areas.ī. The combustible and non-combustible garbage is sorted out. This type of waste disposal / refuse are collected separately and disposed off.Ī. Garbage is collected separately in dustbins and conveyed by covered carts or lorries to suitable place. ![]()
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