Patent ES-8604474-A1 (ES)
Title: Method of clarifying a solids-loaden liquid by means of a sludge blanket.
IPC: C02F1/52
Filed: 1985-07-31
Abstract: A flocculating agent is dosed into the liq. so that articles are agglomerated to form flakes. The liq. is fed into a distribution chamber in order to exert constant head pressure on a number of injectors which discharge the liq. at points spaced around the base area of a clarification chamber. Flakes from injected liq. build up a sludge bed through which lio. is clarified as it rises for overflow discharge and collection. - Between the distribution chamber and each injector, pressure head loss is adjusted so that all injectors deliver at similar pressures. Each injector delivers via a guide baffle which breaks the flow into divergent jets creating a circulatory turbulence in the sludge around, and for a limited distance, above the injector. The injectors are disposed so that the areas of turbulence touch or overlap slightly so that virtually the whole base area of the clarification chamber is covered by turbulent agitation of sludge. - Esp. applicable to the purificn. of waste water from the paper mfg. industry and from industrial processes concerned with refining mineral ores, etc. - The process offers a greatly increased capacity from given size of treatment plant. This results from much faster rise of liq. through the sludge bed because of the turbulence created by the injectors. The rising flow is controlled so that there is no danger of breaking up flakes. EPAB- EP-174232 B A flocculating agent is dosed into the liq. so that articles are agglomerated to form flakes. The liq. is fed into a distribution chamber in order to exert constant head pressure on a number of injectors which discharge the liq. at points spaced around the base area of a clarification chamber. Flakes from injected liq. build up a sludge bed through which lio. is clarified as it rises for overflow discharge and collection. - Between the distribution chamber and each injector, pressure head loss is adjusted so that all injectors deliver at similar pressures. Each injector delivers via a guide baffle which breaks the flow into divergent jets creating a circulatory turbulence in the sludge around, and for a limited distance, above the injector. The injectors are disposed so that the areas of turbulence touch or overlap slightly so that virtually the whole base area of the clarification chamber is covered by turbulent agitation of sludge. - Esp. applicable to the purificn. of waste water from the paper mfg. industry and from industrial processes concerned with refining mineral ores, etc. - The process offers a greatly increased capacity from given size of treatment plant. This results from much faster rise of liq. through the sludge bed because of the turbulence created by the injectors. The rising flow is controlled so that there is no danger of breaking up flakes. (Dwg.0/7) - EP-174232 B Method of clarifying a liquid charged with solid material using a sludge bed, which is applied to a liquid charged with fine particles in suspension for providing both a clarified liquid and a sludge, the method comprising the following operations: adding a flocculation additive to said charged liquid for preparing a mixture in which said fine particles that meet link up with one another and form flakes feeding this mixture in a substantially continuous manner into a distribution chamber having substantially uniform pressure and which supplies the mixture to a clarification chamber via a plurality of injectors distributed over the surface of the chamber, and each having an axis removing the clarified liquid via a respective outlet orifice disposed in the upper part of the clarification chamber removing the sludge fromthe clarification chamber via at least one respective outlet orifice located substantially at a lower level than the liquid outlet orifice, each of the injectors being likewise located at a lower level than the liquid outlet orifice, and the flow rate of the injected charged liquid being selected in such a manner that a sludge bed is formed above the injectors, in which the charged liquid rises up between the flakes which have already been formed, so that the fine particle still suspended in the liquid link up with these flakes thereby increasing their volume, and that the liquid is clarified above said sludge bed and forms a layer of clarified liquid above the sludge bed, each of the injectors being provided with guide means, this method being characterised in that an internal head loss is established between the distribution chamber and the outlet of each of the injectors, which is greater than a minimum value and substantially the same for the various injectors, this minimum value being equal to the pressure difference at the bottom of two columns of liquid which may have the same height, equal to the maximum height of the sludge bed above USAB- US4592845 A Liq. clarification for liq. charged with fine particles in suspension, comprises adding flocculant to bind particles into flakes before feeding the liq. into a uniform pressure distribution chamber. Injectors then pass the liq. into a clarifi-cation chamber having a top clarified liq. removal port and a low level sludge removal port. - Liq. from the injectors is fed at such a rate that a sludge belt is formed above them, for collecting fine particles onto the flakes as liq. passes up through the belt and forms a clarified liq. layer above it. The injectors effect controlled agitation in lower layers of the belt.