Method for biochemically treating wastewater

Abstract

A method for effectively treating organic matter and nutriments such as nitride and phosphide in wastewater. The treatment comprises follow parts of: a settling tank for separating sand and debris in wastewater by deposition; an anaerobic tank comprising a simple and contact aeration tanks for denitrification of returned sludge in which the nitrogen is converted from ammonia (NH4) to nitrite (NO3) by oxidation, with a carbon source of feeding wasterwater in anaerobic condition to convert nitrogen element to nitrogen gas by adding a denitrogenation oxidation bacterium and discharging the nitrogen gas to air; a biopond equipped with a biomake and an aeration device for activating microorganisms and supplying activated microorganisms into the simple and contact aeration tanks; the simple aeration tank for decomposing organics and for converting ammonia (NH4) to nitrite (NO3); the contact aeration tank for decomposing residual organics and for converting residual ammonia (NH4) to nitrite (NO3) by microorganisms attached to media; a sedimentation tank for settling sludge and for removing residual phosphorus by using coagulation; and a concentration tank for deposited sullage dehydrating to improve concentration.

Description

technical field [0001] The invention relates to a method for treating high-level sewage in a biological and chemical manner, including the stage of sedimentation and sedimentation tank, the stage of anaerobic tank, the stage of biological pond (Bio-pond), the stage of simple aeration tank, the stage of contact aeration tank, the stage of sedimentation tank and concentration slot stage. Background technique [0002] In the sewage treatment method, one of the problems that have been proposed for the longest time and have not yet been resolved is the so-called poor sedimentation in the sedimentation tank, and the difficulty in simultaneously removing nitrogen and phosphorus by biological methods. That is to say, the current problem is that the existing biological treatment methods have poor ability to respond to the load change of inflowing raw water, because the excessive reproduction of filamentous bacteria (Filamentous Microorganisms) in the aeration tank leads to sedimentat...

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Problems solved by technology

However, for the low-concentration sewage in South Korea, where the flow and concentration vary greatly due to geographical and seasonal factors, and the concentration of the sewage flowing into the sewage treatment plant is very low, there is little question whether the biological nutrient removal method can be adopted. know (Wallis-Lage, C.L., et al., (1992)

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