Sewage treatment includes removing grease and suspended material, aerobic bacterial filtration to produce one stream for centrifuging and other stream receiving ultra violet radiation and osmosis or micro=filtration

摘要

Polluted water in a non-corrodible tank has grease and suspended material removed before being decanted and given an aerobic bacterial filtration in a compact efficient device to produce two streams. Polluted water in a non-corrodible tank has grease and suspended material removed before being decanted and given an aerobic bacterial filtration in a compact efficient device to produce two streams. One stream is clarified by centrifuging on a membrane. The other stream with suspended particles = 30 mg/l and 5 day BOD = 40 mg/l receives ultra violet radiation and osmosis or micro-filtration. Independent claims are included for the following: (a) a device for performing the above treatment including a channel fitted with deflectors and supports for the bacterial filters; the waste water flowing through the channel under gravity and being cycled through the channel more than once; a pump maintaining the level in the channel; water being drawn off from the channel and passed to a centrifuge membrane filter; (b) a device for performing part of the above treatment including an open basin with an overflow, a sand filter, a centrifuge filter removing particles - 50 mu m, a pH controller, an ultra violet sterilizer and a carbon filter for absorbing residual chlorine from insecticides, pesticides, water treatment agents, etc.; (c) a device for performing part of the above treatment includes pre-filtration to remove particles - 5 mu m and then a carbon filter removing residual chlorine and particles down to 1 mu m; osmosis removing particles down to 0.0001 mu m including bacteria and heavy metals radioactive material, etc.; another filter cartridge removing other chemicals; The pure water then going to a closed storage tank to prevent it becoming contaminated; and (d) installations combining (a), (b) and (c). The order of the treatment stages can be flexible. The stages can be movable modules. Preferred Features: The installation can be computer controlled.