| With the development of our national economy, such a batch of the tertiary industry as food and beverage , traveling ,etc. develop rapidly too. While bringing about a prosperous economy, these trades have discharged a large amount of pollutant; caused serious influence to urban environment. The pollution factor of the environment of catering trade is mainly noise, smoke and dust and sewage, among them the proportion that the sewage accounts for in the urban waste water increases progressively year by year. The sewage contains such polluter as organic matter, chemical detergent, suspended substance, oils, etc. they have caused serious pollution to water environment.The waste water for experiment is taken from the dining hall, PH is 6—7, CODcr is 1000 —3000 mg·L-1. The main pollutant of this kind of sewage is oils, polluter of the suspended substance and dissolving organic matter.At present, actived sludge treatment, biological rotary, biological contact oxidation, Fixed bed bioreactor, Thick melting, Electrochemistry , coagulation, etc. are used, there are many successful examples, but, shortcomings can't avoid, for instance: technology is complex, treatment is not thorough, cost of function is high, demand of management strict.The thesis treats liquid waste water assuming a few different methods, experimental results shows: Single oxidation or coagulation can't amount to good effect. Oxidation—coagulation can reach the better result. After treatment, water quality is stable, CODcr is under 200 mg·L-1.At first, liquid waste is oxidized by KMnO4, the addition of KMnO4 is 6.0 mg·L-1, reaction time is 40min, then coagulation is conducted to oxidized liquid waste, addition of PFS is 200 mg·L-1, addition of PAM is 2.0 mg·L-1, sedimentation time is 25min.The removal rate of CODcr is about 86%.
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