Study On The Transforming Rules Of Ammonia-Nitrogen And The Best Nitrogen-Removing Process Condition In The Biological Handiing Process Of The Meatpacking Wastewater

The waste water caused by meatpacking is one of the biggest industrial resources that make the effect of organically pollution, especially nitrogen pollution. Now the handling of meatpacking waste water is typically based on biological methods. In the process of handling, although organism can be discharged according to the certain requirements, the efficiency of pulling off nitrogen and ammonia actually has been rather low. This paper focuses on researching handling waste water in Mianyang Shuanghui food Co. lid. And for the first time it reaches the further study on ABR and improved SBR combined techniques and the rules of transforming nitrogen and ammonia. According to the ways of testing, experimenting, simulating, theoretical analyzing, the major factors affecting the efficiency of pulling off nitrogen are founded in the process of experiment. Meanwhile, the running situation and parameters are definitely pointed out aimed at the standard of pulling off nitrogen. In addition, the transforming rules of the indexes of nitrogen, COD, pH etc. is analyzed in the process of reactions.Much research and testing describes that the low rate of hydrolyzing and acidification, the insufficient air exposed, the too short age of mud, and nonstandard manipulation are the main restricting factors leading to the low rate of transforming nitrogen in the running techniques at the locale, and the result of the processed water hard to meet the criteria permitting ammonia and nitrogenBy simulative testing, the best running parameters of ABR-SBR combination techniques under aimed at pulling off nitrogen. The best ABR HRT is 6h; the best running modal of SBR is: watering-in + airing(8h) + anaerobic whisking(1h) +back-period airing(0.5h) + depositing(lh) + watering-out, during the running process, DO is easy to be restricted to 2mg/L also, MLSS to 3000mg/L, density of watering-in ammonia- nitrogen should be to among 20100mg/L, and outside carbon source appropriately should be selected from methanol.Simulative testing also indicates that under the optimized running condition, ammonia- nitrogen is growing gradually with the time prolonging of hydrolyzing and acidification during the ABR reaction stage, when increasing to a certain peak, and then declining ratherish; saltpeter-state nitrogen changing fluctuantly. Saltpeter-state nitrogen is rising with the prolonging of air exposing time, till to the peak at the end of nitrifying reaction, and then in the anaerobic anti-nitrifying the density declines evidently; the TN value declines with the prolonging of reaction time. This Simulative testing also announces the transforming law of CODcr and the pH value in the course of the reaction.The arts and crafts of the combination of improved ABR and SBR can unite the disposal of anaerobic and aerobic, bring into play the unique privilege of different microbes. The effect of ammonia- nitrogen wiping-off is evident. In this simulative testing, the final rate of COD wiping-off is 84%, and the rate ammonia- nitrogen wiping-off is 100%, both reaching the State- stair emission criterion. To compare with the Shuanghui waste water station in Mianyang, the rate of ammonia- nitrogen wiping-off is raised 115.26%.