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A lot of solid particles suspended in the wastewater of food industry, organic matter content, water quality and quantity changes, the general characteristics of non-toxic, if not treated directly discharged into the water to form water eutrophication, so finding appropriate and effective treatment on the entire national economy and even the sustainable development of human society are great of significance.The research work was in two-synthetic sewage treatment plant in Taiyuan. The wastewater in this plant was treated by hydrolysis+with hypoxia secondary bio-contact oxidation method, the process is the main advantage of micro-organisms in the anoxic bacteria in the hydrolysis and acid production of the role of bacteria complete acidification, in the Aerobic removal of organic matter by biofilm to the purpose.This article is based on two-synthetic sewage treatment plant in Taiyuan as the research object, the second anoxic hydrolysis of+ biological contact oxidation process of commissioning trials. The results show that:1. biofilm cultivation and domestication of microbes is a crucial stage technology startup, using a continuous way of water, at first into the water for the design of fifteen per cent of water and gradually increase the amount of water until the full load until the amount of water Controlled at 1m3/h,2.5m3/h,4m3/h,5m3/h, COD, NH3-N and SS removal rates were 88%, 68%, 85%, the effluent discharge standards to sewage treatment level;2. It wasinvestigated at different hydraulic retention time and gas to run water over the impact on the process, the optimum residence time of 7h, the best gas-water ratio of 11:1;3. After adjusted operating parameters, in thenormal production conditions, the amount of wastewater was 90-120m 3/d, the average effluent COD, NH3-N and SS concentrations were 53mg/L,7mg/L, 40mg/L, the removal rates were 92%,80%,90%. The results showed the wastewater quality was greatly improved by this process.4. In the production of large food-processing plants, waste water emissions in the 140-170m 3/d. COD, NH3-N and SS removal rates were 88%, 76%, 89%. the removal rates was a littlte reduction. But it was not obvious. According these results, these showed that the system had a strong ability at the impact resistant capability. 5. The temperature had great influence on the result of denitrification in this process. When thewastewater temperature was above 10℃,the concentration of NH3-N in the outlet wastewater compliesed with the Sewage discharge standard.
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