Based On The Materialized - A Sequencing Batch Biofilm Process Kitchen Waste In Anaerobic Digestion

With the rapid development of the city economy in our country, urban domestic garbage becomes more obvious every day. Urban domestic garbage contains a lot of kitchen wastes in our country.It will harm environment and human health if kitchen wastes are illogically dealed with. Calorific value of kitchen wastes is low, water content of kitchen wastes is high. So kitchen wastes are easy to digest. Anaerobic digestion was considered to be a sustainable technology for organic wastes. It is considered to be efective using anaerobic digestion as a means of reducing the volume of kitchen wastes and generating methane biogas for energy recovery. After anaerobically digested, kitchen wastes will produce a lot of wastewater. It will bring the problem of secondary pollution. The wastewater in this paper is produced by anaerobic digestion for kitchen wastes, in which the main dangerous elements is organic pollutants, SS and NH₃-N.In the paper, the authors study on anaerobically digested effluent of kitchen wastes treatment by using physicochemical -Sequencing Biofilm Batch Reactor. Physicochemical method treats anaerobically digested effluent to cut down organic pollutants. It is easy to succeeding treatment. Treated water is for reuse.This physicochemical treatment uses two methods: polyaluminium chloride coagulant and Adsorption of Powdered Activated Carbon. In the first, the optimal operational indexes are determined for polyaluminium chloride coagulant and Adsorption of Powdered Activated Carbon. In the second, the removal ratio of polyaluminium chloride coagulant and Adsorption of Powdered Activated Carbon is contrasted in the experiment. The results show as follows: COD removel rate is 82.8% and 84% by polyaluminum chloride and Powdered Actived Carbon when the concentration of COD in the solution is 820mg/L; COD removel rate is 80.24% and 26.67 % by polyaluminum chloride and Powdered Actived Carbon when the concentration of COD in the solution is 4500mg/L. So the effect of polyaluminum chloride is superior to the effect of Powdered Actived Carbon. Polyaluminium chloride as a coagulant in anaerobically digested effluent of kitchen wastes is good.The paper studies the choice of the best running mode in a Sequencing Bioflm Batch Reactor. The facts to influence removal efficiencies of nitrogen, such as organic load, dissolved oxygen, temperature and pH are emphatically studied. The experimental result indicates that removal efficiencies of COD and NH3-N reach 87% and 86% under the best running condition. The best running condition is as follows: influent time is 0.5h, aeration time is 4h, anaerobic time is 2h, aeration time is 2h, sedimentation and drainage time are 0.5h; DO is 3.5-5.0mg/L ; pH of influence is about 8.0; temperature is about 25℃. This process obtains satisfactory removal efficiencies, because it combines the merits of Sequencing Batch Reactor and biological film reator. This paper introduces validates the model of biofilm growth too.Treated water by coagulation -Sequencing Biofilm Batch Reactor reaches the second level of discharge limits of landfill leachate in the paper. It send the municipal sewerage treatment plants directly and up to the discharge standard.