Low Carbon And Nitrogen Of The Induatrial Park Wastewater Biological Nitrogen Removal Characteristics Research

Ammonia is the core of the nitrogen cycle and the first link, first be reflected in the common "three nitrogen pollution in the nitrification of ammonia nitrogen and utilization of the process. Also, because ammonia is generally after nitrate nitrogen or nitrite nitrogen can be transformed into harmless nitrogen gas, so the latter’s pollution hazard by the former transformed from. Ammonia hazards pose a threat to safe drinking water and harm fish and other water animals, resulting in eutrophication, lake ecosystem vicious circle; in industrial wastewater treatment and reuse, could easily lead to micro-organisms in water biofouling formation in the device and plug the pipe. With the improvement of people’s living standards, changes in eating habits, the urban sewage water composition has changed a lot, and the increase of nitrogen content of most of the towns appear low carbon and nitrogen than the sewage. Conventional activated sludge treatment of low carbon and nitrogen organic carbon sources, nitrogen removal efficiency, effluent total nitrogen content exceeds the emission standards, and low sludge wastewater easy.The subject of biological treatment to low carbon and nitrogen ratio of the industrial park wastewater using an integrated composite bed reactor as the main processing unit, a composite bed reactor to be completed by nitrification and denitrification processes, to achieve the denitrification of wastewater, due to a mixture with sewagemud return system played a stirring, do not need to set the mixing facilities, so you can save for power consumption and equipment, infrastructure investment of about20%to30%, improve the reaction efficiency and the treatment effect at the same time the whole system, the environmentand economic benefits are very obvious. In the field of industrial organic wastewater treatment, especially for carbon, nitrogen imbalance, urban sewage, which has practical value and an important guiding significance. The main subject of the A/0composite bed reactor to denitrification as the main target. In this study, the the Taiyuan shop wastewater treatment plant raw water, to test the impact of the A/0composite bed reactor denitrification effect of the main operating parameters designed to determine the optimum operating parameters of the composite bed reactor denitrification. Influent COD concentration of155mg/L~307mg/L, NH3-N concentration of60mg/L,~180mg/L, the C/N1/3to1/6, the reflux ratio is100%~300%by controlling the denitrification zone pH of7.0~7.5, the D0<0.5mg/L, HRT for1h4h, SRT15d; the nitrification district pH of7.0~8.0, the DO of2mg/L,~5mg/L, HRT of2h8h, results show that:1. When the the nitrification district dissolved oxygen concentration of3.0mg/L can be obtained good oxygenation, in the influent ammonium concentration of90mg/L, HRT=6h, ammonia nitrogen load0.6kgNH3-N/m3· d, reflux ratio200%ammonia removal can be stabilized at more than90%. When the influent ammonia concentration of90mg/L, ammonia nitrogen load0.3kgNH3-N/m3· d to maintain nitrification District DO=3.0mg/L, HRT is greater than6h reactor ammonia removal is better to reach92.2%or more. With the increase in influent ammonia load, the composite bed reactor ammonia removal and nitrification District ammonia removal efficiency was maintained at75%when influent ammonia load is greater than0.72kgNH3-N/m3d or more.2. In the influent ammonium concentration of90mg/L, HRT=6h, ammonia nitrogen load0.6kgNH3-N/m3d, returning more than200%, the average removal rate of NH3-N increased to83.7%, and the effluent ammonia concentrationreduced to14.5mg/L, indicating that200%of the reflux ratio, the activity of nitrifying bacteria, nitrification process can be carried.3. Water C/N is one of the key factors of the composite bed reactor Removal of Nitrogen and carbon. Influent COD of155mg/L~307mg/L, NH3-N for the48mg/L,~52mg/L, to maintain the C/N1/3to1/6in the composite bed reactor Removal of Nitrogen and carbon effects test. The results showed that the C/N is about5/1composite bed reactor for nitrogen removal to meet the demand for carbon source, at this time, the COD removal efficiency of87%,90%average removal rate of NH3-N The denitrification District of N03-N removal rate of99%, TN average removal rate of74%. C/N is too low or too high will lead to the denitrification reactor in addition to the decline of the carbon effect.