Patent EA-002291-B1 (EA)
Title: Method for operating an upflow sludge blanket filtering plant
Inventor: EPPLER DIETER
IPC: B01D21/34
Filed: 1998-08-25
Abstract: 1. A method for operating an upflow sludge blanket filtering plant for separating particulate impurities from the raw water being treated, using several narrowing funnel-like in the base area reactor vessels (10), said reactor vessels (10) have raw water supply channels (1) in the base area and clarified water channels (4) in the top area, the water which has been purified flowing out of the reactor vessels via said channels (4), sludge drainage chambers (8) are located between or next to the reactor vessels (10) and are hydraulically connected thereto, impurities from the raw water are drained from the sludge drainage chambers (8) in the form of sludge by a sludge drainage device (7), characterized in that the sludge is only drained from a sub-set of sludge drainage chambers (8) of the upflow sludge blanket filtering plant at any one time and in that the raw water supply channels of the reactor vessels (10) are blocked off by means of slider devices (6) whilst the sludge is being drained, said reactor vessels being hydraulically directly connected to their respective sludge drainage chambers, said channels are re-opened after drainage. 2. The method of claim 1, characterized in that the volumetric rate of purified water being flowing out of the reactor vessels is continuously measured and by the regulation the volumetric rate of raw water is set at a constant given value. 3. The method of claim 1 or 2, characterized in that said slider devices are driven by electrically, pneumatically or hydraulically remote-controlled device. 4. The method of claims 1 to 3, characterized in that the sludge is drained only from one said sludge drainage chamber (8). 5. An upflow sludge blanket filtering plant for separating particulate impurities from the raw water being treated, using several narrowing funnel-like in the base area reactor vessels (10), said reactor vessels (10) have raw water supply channels (1) in the base area and clarified water channels (4) in the top area, the water which has been purified flowing out of the reactor vessels via said channels (4), characterized in that aid filtering plant comprises sludge drainage chambers (8) located between or next to the reactor vessels (10) and hydraulically connected thereto at a definite height from the base, impurities from the raw water are drained from the sludge drainage chambers (8) in the form of sludge by a sludge drainage device (7), an electrically, pneumatically or hydraulically remote-controlled device for operating slider devices (6) permitting to block-off the supply channels of the reactor vessels whilst the sludge is being drained and re-open them after drainage, a measuring device (11) for continuous measuring of the volumetric rate of purified water being flowing out of the reactor vessel having a level gage for measuring the purified water level in the reactor vessels of the filtering plant, and a computing device (12) for calculating volumetric rate of purified water flowing out of the reactor based on the information of the purified water level height taking into an account the information of actual cross section of the raw water supply channels (1), and a regulating element (13) for regulating the volumetric rate of purified water flowing out from the sludge drainage chambers (8).