Coking Sewage Aerobic Biochemical Treatment Foam Control Technology Research

Activity of sewage treatment plant sludge is currently one of the most widely usedbiological treatment methods, but widespread problem is surface often produces a lot ofaeration bubbles. Too much foam will cover surface of aeration tank, foam and overflowfrom the pool will be seriously contaminated the surrounding environment and damage tothe external device. General foam into starting surfactant foam and biologicaldenitrification in foam, bubble, foam four forms. Aerobic activated sludge stage foam, themain reason is because there is a lot of surface active substances in the water and sludgein the some of the excessive proliferation of microorganisms, which can lead to bubbles.This topic is mainly used for coking wastewater treatment with aerobic activatedsludge stage experimental study on influence factors of foam, optimized and controlledconditions. Experiment of aerobic in pool by adjusting the pH, dissolved oxygen,temperature, aeration, and average residence time of these affect the amount of foam cellformation and accumulation of factors to effectively control foam. Experimental resultsshow that adjusted the oxygen in the pool when the pH value of6.8, control of dissolvedoxygen concentration in the1.5mg/L, when the temperature is21℃, average cellresidence time in24-hour time, foam thickness average control in5.5cm. By means of abiological control method of activated sludge treatment, can effectively address the cokingwastewater aerobic treatment produce a lot sludge wastage and the surroundingenvironmental pollution problems caused by foam, allowing aerobic pool water to normalaccess to the next unit for efficient processing, maintaining effective aerobic poolbiodegradation of biomass and normal weight. This research used control method issimple, easy, and can be applied of coking wastewater in aerobic bio-treatment.