Study On The Influence Of Concentration Of NH₄⁺-N To Hybrid Biological Reactor Operation

With the rapid development of China's national economy and the highly crowded urbanization, a variety of pollutants emissions has increased dramatically. This fast economic growth has also caused the serious pollution to the environment, especially water body, and the concentration of ammonia nitrogen in the water environment is also rising. Beacause the ammonia wastewater ingredient is complex, toxic and hard to be dealt, it is great harm to the environment. Based on the concept of sustainable development, the goal is not only to pursue highly effective denitrogenation to reach the government environmental standard, but also to work hard for saving energy consumption, avoiding secondary pollution, and recycling the valuable ammonia resources fully at a higher level of environmental and economic goals in the field of concentrated ammonia nitrogen wastewater treatment.This project chosed suspended spherical filler as microbe carrier for the hybrid biological reactor to treat with manually fixed wastewater containing different concentrated ammonia nitrogen, and investigate the launch conditions and some of the running parameters. The best operating conditions used as a source of reference to high strength ammonia wastewater treatment were determined by analyzing the removal rate of contaminative factors including COD and NH4 +-N. The result indicated1. During the start-up period of the hybrid biological reactor using manually simulated sewage, the membrane to be found had realized and the sludge had successful inoculated by means of static and then dynamic immobilization and acclimation of microorganisms. During three weeks period,the color of the biomembrane on the filler changed from yellow to milk yellow, and then to brown. The removal rates of COD and NH4 +-N were stable through testing the water from of the sedimentation tank. As a result, the biomenbrane had formed.2. Through the comparative analysis of treatment effects of pollutants, the optimal operating parameters of the system were determined. The test studied the effects of the treatment effect from the hydraulic retention time, organic load, gas-water ratio, and several other aspects of the hybrid biological reactor. The results indicated that the treatment effect was optimal under the conditions which the water temperature was controlled at about 25℃, pH about 7.5 8.5, HRT for 8h, the influent COD concentration controlled from 450mg/L to 500mg/L, and the ratio of air to water was controlled at 30 to 1.3. In the best operating conditions, the influence of different influent concentrated NH₄⁺-N to the treatment effect of HBR studies had shown that the changes about influent concentrated NH₄⁺-N produced a great impact on NH₄⁺-N removal efficiency of the hybrid biological reactor. The NH₄⁺-N removal rate increased first and then slowly decreased with the increase of the concentration of NH₄⁺-N in the waste water. When rate COD to N was about 20, the removal rate of NH₄⁺-N reached the top, which is about 87%. The concentration of NH₄⁺-N in the waste water had a less influence to the COD removal rate, which is between 87% to 93%. In addition, the suppression and poisonousness for microorganism of some contamination in the waste water(e.g.:free ammonia and nitrite)could affect sewage treatment effect of the hybrid biological reactor.