SILT SITE Russian patent published in 1997 - IPC

FIELD: cleaning municipal sewage water. SUBSTANCE: silt site is intended for dewatering of municipal sewage water sediment and it has water-proof base 1, drainage filtering devices with filters 2 and water branching pipes 3 provided with removable stoppers, water receiving troughs 4, pipeline 5 for delivery of liquid sediment, water branching pits 6 and guarding dike 7 made of horizontal layers of filtering material. Dam pad rests on water-proof base of silt site and layers are arranged with displacement towards central vertical axis and they create reservoir in the form of truncated pyramid. Water branching pits are sectional and made of circular members 14, 15, 16 placed vertically one upon other. Used as filtering material for dike is dewatered sediment of municipal sewage water. Silt site is operated as follows. Primarily it is filled with liquid sediment, then it is filtered through drainage filtering devices and dike. Above-silt water is branched away through water branching pits, dewatered sediment is held untouched for certain period, then removed. Before filling, silt site is guarded by lower layer of dike and water branching pipes 3 are closed with their stoppers. In process of filling and as sediment is being accumulated, further layers of dike are erected together with raising height of water branching pits. Upon filling of silt site to top level of dike, sediment is kept untouched for some time. At this time stoppers are removed from water branching pipes 3 and dewatering takes place by filtering through drainage filtering devices and dike. During holding period sediment of municipal sewage water is fully stabilized and decontaminated. EFFECT: high efficiency. 3 cl, 3 dwg