Method for clarification and denitrification of nitrate-containing wastewater.

摘要

1363797 Water purification ITT INDUSTRIES Inc 7 Dec 1972 [14 Dec 1971] 56481/72 Heading C1C A process for removing sludge from polluted water, comprises aerating and nitrifying the water in a first reactor, allowing the larger particles to settle therein, pumping the soclarified water from the first reactor together with a precipitating agent to a second reactor, which second reactor has an upper and lower sludge layer with a clear water layer therebetween into which the clarified water is pumped and allowing the contents of the second reactor to flocculate and denitrify for a sufficient period of time for the flocculated sludge to separate into the upper layer and lower layer. The denitrification is enhanced by providing a bacteria colony on a carrier in the second reactor. Further, a denitrification energy source, e.g. methanol, may be provided. The process may be carried out in the apparatus shown in Fig. 1, wherein polluted water is aerated and nitrified in biological reactor 1 and then pumped to chemical reactor 2, being delivered via slots 12 in tube 11, into the water layer 13, which layer is between floating sludge layer 14 and sinking sludge layer 15. After separation, purified water is removed via pipe 19.