ADVANCED DRINKING WATER TREATMENT

摘要

An advanced water purification system is provided to enable submerged membranes to be used for a long period of time, recover at least 99% of raw water, effectively purify raw water even when the amount of raw water varies rapidly, efficiently perform normal washing and backwashing processes without stopping the system, prevent overload of an air diffuser, and maintain water purification process without operation stoppage when a specific or second-stage membrane filter tank is not operated. An advanced water purification system comprises: a coagulation tank(10) having a raw water inflow pipe(11) formed thereon, the raw water inflow pipe having a coagulant injection part(13) and a rapid mixer(14) formed thereon; a plurality of first-stage membrane filter tanks(20) which are arranged in parallel, and in which a submersed membrane(40) is formed to purify raw water flown into the first-stage membrane filter tanks from the coagulation tank; a second-stage membrane filter tank(30) in which a submersed membrane(40) is formed, and which is in communication with bottom parts of the first-stage membrane filter tanks to purify raw water that has not been filtered through the first-stage membrane filter tanks; an air diffuser(90) which is in communication with bottom parts of the first-stage membrane filter tanks and the second-stage membrane filter tank respectively to separate suspended solids adsorbed onto the submersed membrane by supplying air into the first-stage membrane filter tanks or the second-stage membrane filter tank; a discharge pipe(31) which is connected to the bottom part of the second-stage membrane filter tank, and from which concentrated non-treated raw water is discharged; a transfer pipe(60) which is in communication with the first-stage membrane filter tanks and the second-stage membrane filter tank, and on which first pumps(61) are formed to suck purified raw water through the submersed membrane, and a treated water tank(50) for storing purified raw water, wherein the treatment capacity of other membrane filter tanks increases in a case where a specific membrane filter tank of the first-stage membrane filter tanks is not operated.