| With the development of industry, more and more chemical products come into our lives. These products bring convenience to our life, as well as a large number of substances which are harmful to the environment, especially in the industry aggregation zone or industrial park, where industrial enterprises are concentrated and all kinds of industrial wastewater may present. Moreover, the production cycle of the enterprises in the industrial park may change in different season, the quantity and quality of the wastewater collected in the park varies a lot. The above reasons make the operation of wastewater treatment plant in industrial part unstable.The study in this paper was carried out in a wastewater treatment plant(WWTP) A in Jiangsu province. The source and quantity of wastewater in WWTP A was investigated and the operation problems were analyzed. The SBR operation and chemical phosphorus removal was optimized based on the lab scale experiment. A circulating hydrolysis reactor modified on the basis of the exist hydrolysis basin was developed and the performance of the modified hydrolysis reator w as investigated. The feasiability of ozone oxidation, iron carbon micro electrolysis and Fenton oxidation as the pretreatment technology for wastewate were studied. The fate of the characteristic pollutants in wastewater were analyzed using GC-MS.The optimized operation scheme for SBR was feeding 1.5 h, stirring 0.5 h, aeration 1.5 h, precipitation 1 h and withdrwal 1 h. The results from the optimization of phosphors removal showed that the best chemical adding location was at the end of the biological treatment, the best chemical agent was polymerization aluminum iron and the best dosing coefficient was b = 3. Under this condition, the phosphorus in the effluent can be guaranteed below 0.5 mg/L, and 30% of COD removal can be achieved. The performance of the circulating hydrolysis reactor for pollutants removal before and after adding composite fillers(combined hydrolysis reactor) was investigated. The addition of composite filler was proved to be able to improve the hydrolysis effect More than 30% of COD removal efficiency was achieved when filler was added. The optimal HRT for the combined hydrolysis reactor was 10 h, the biodegradability of the influent increased and the B/C ration increased from 0.242 to 0.283 on average. The combination process of the circulating hydrolysis reactor with the SBR combination showed a strong resistance to shock load, chemical phosphorus removal has to be used. When pollant shock occurred, polluants removal efficiency can gradually be restored by adding the carbon source.The feasiblity of using ozone oxidation, iron carbon micro electrolysis and Fenton oxidation as the pretreatment technology was investigated under their optimal operation conditions, the fate of the characteristics pollutants durin g the treatment were analyzed as well. The results suggested that the B / C ratio could be increased by using iron carbon micro-electrolysis. The performance of the combined process of iron carbon micro electrolysis and modified hydrolysis reactor and SBR was studied. The ammonia removal efficiency of 100%, total phosphorus removal efficiency of 100% without chemical addition were achieved. Under normal influent condition, the COD, TN concentration in the effluent can meet the discharging standard, however, the influent shock will cause the increase concentration of the effluent. Druing the experiment period, 87.5% of the operation could meet the COD discharging standard and 75% could meet the TN discharging standard. |
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