Abstract:
A method and an apparatus for condensing and dewatering sludge are provided to improve the efficiency in condensing and dewatering of the sludge, by repeatedly controlling the optimum input amount of organic polymer, and to reuse a discarded water by producing a filtered water in which the polymer does not remain. Sludge is condensed and dewatered by controlling a flow of the sludge, inputting organic polymer into the sludge and stirring the sludge and the organic polymer through quick rotation and filtration, separating solid and a filtered solution from the stirred sludge and organic polymer in a condensing and filtering bath(6), and dewatering the resultant sludge. The inputting of the organic polymer is performed by measuring a flow electric potential value of colloid, which exists within a quick filtered solution generated by the quick rotation and filtration, and repeatedly inputting positive type organic polymer for electrically neutralizing the colloid. The measuring of the flow electric potential value is performed by detecting voltage at both ends of a passage of a streaming potential detector when the quick filtered solution is passed through the passage.
Abstract:
본 발명은 순간 혼화-막 여과 공정을 정수처리에 적용함에 있어서 응집제 투여 및 막 여과 공정의 동시 제어 방법 및 그 장치에 관한 것으로, 구체적으로 정수처리를 위한 순간 혼화-막 여과 장치에서 유입된 원수를 응집제와 순간 혼화하는 단계(a)와 상기 단계(a)를 거쳐 원수와 응집제가 혼화된 혼화수의 스트리밍 포텐셜(streaming potential)을 측정하는 단계(b) 및 상기 단계(b)를 거친 혼화수를 여과하는 막 여과 단계(c)를 포함하며, 특히 상기 단계(b)에서 측정된 스트리밍 포텐셜이 0이 되도록 원수에 투입되는 응집제량을 조절하는 것을 특징으로 한다. 따라서, 막 여과 공정의 전단계인 순간 혼화 공정의 최적 응집제 투입량 결정 및 막에 최소한의 파울링이 일어나는 유입수를 공급할 수 있으며, 결과적으로 순간 혼화-막여과 공정을 정수처리에 적용시 혼화수의 스트리밍 포텐셜(streaming potential)을 측정하여 양 공정을 동시에 자동으로 제어할 수 있다.
Abstract:
PURPOSE: A device for more economical removal of high concentration nitrogen from wastewater using MLE (Modified Ludzack Ettinger) process is provided, which is characterized in that heterotrophic denitrification process is employed after the MLE process, wherein elemental sulfur is used as electron donor for the growth of heterotrophic denitrifying bacteria. CONSTITUTION: The device comprises a heterotrophic denitrification unit(1) comprising an anoxic tank(2), an aerobic tank(3) for nitrifying wastewater and an inter return line(5) for continuously returning nitrified wastewater from the aerobic tank to the anoxic tank; a clarifier(4) for settling suspended solids down; an inflow weir(12) over which water flows; a sulfur packed bed reactor(10) in which granular sulfur(15) is packed and the inflow weir is formed at one upper side therein; a back wash weir(16) which is formed at a position lower than that of the inflow weir inside the reactor; an air compressor(20) which upwardly supplies pressurized air into the sulfur packed bed reactor; a back wash valve(21) which is installed on a pipe through which the compressor is connected to the sulfur packed bed reactor; an effluent storage tank(30) into which effluent of the sulfur packed bed reactor is introduced through an effluent pipe(40,41); an effluent valve(33) which is installed on the effluent pipe; a reverse injection valve(32) with one end connected to the effluent pipe between the effluent valve and the sulfur packed bed reactor, and the other end connected to bottom portion of the effluent storage tank; and a reverse injection pump(31) which is installed between the reverse injection valve and the effluent storage tank.