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The aerated biological filter successfully applied in many sewage treatment industries in China has the characteristics of small volume, high volume load, large hydraulic load, short hydraulic retention time, less infrastructure investment required, and good quality of treated water. Is it possible to make the most of the aerated biological filter? Factors such as temperature, packing layer height, hydraulic retention time (HRT), and pollutant load are the main factors affecting the aeration biological filter removal rate. Our company uses domestic spherical lightweight ceramsite as aerated biological filter filler to simulate the treatment of low-concentration rainwater and sewage combined wastewater. The influence law of biological filter treatment effect and operating characteristics, and based on this, the BAF process dynamics equation was derived. The main conclusions are as follows:
(1) Biological aerated filter has better sewage treatment efficiency. When the inlet water flow is 30 L / h and the air-water ratio is about 3: 1, the organic aerated filter removes organic matter, ammonia nitrogen and total phosphorus. The rates can reach 90%, 80%, and 70%, respectively. The optimal filler layer heights for removing organic matter, ammonia nitrogen, and total phosphorus are 0 to 60 cm, 30 to 90 cm, and 0 to 30 cm.
(2) The COD removal rate does not change much at 15-25 ° C, but the nitrification has a significant increase with increasing temperature; the optimum temperature for the nitrification of the filter is 24 ° C. , Nitrification is suppressed.
(3) When the ratio of the amount of gas and sewage per hour, that is, the air-water ratio is 3: 1, the longer the hydraulic retention time, the more thorough the degradation of pollutants by microorganisms. In this test, as long as the hydraulic retention time of the aerated biological filter is guaranteed to be more than 1 h, that is, the hydraulic load is less than 1.5m ~ 3 / (m ~ 2 · h), the COD removal rate can be maintained above 90%. When the hydraulic retention time is 1.5h, the removal rate of NH_4 ~ + -N is 78.62%.
During the design process of the aerated biological filter, the above three aspects are strictly designed to maximize the role of the aerated biological filter.