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Watershed petrochemical complex composition, high concentrations of organic pollutants, toxic strong, are more difficult to deal with industrial waste. Currently existing large petrochemical enterprises sewage treatment plant commonly used secondary treatment, but because of the quality and quantity petrochemical wastewater changed greatly, and the pollution load is high, the existing sewage treatment plants are present organics removal unstable and ammonia removal capability poor. The topics to petrochemical wastewater as the research object, petrochemical wastewater emissions from large, complex composition, poor biodegradability characteristics, through a large petrochemical wastewater treatment plant hydrolytic acidification-A / O process engineered to run debug its petrochemical wastewater treatment treatment effect, treatment mechanism and process adaptability of study investigated by analyzing the variation of water quality parameters, derived hydrolysis A / O process of optimum operating control parameters for a similar treatment of refractory Chemical Park sewage treatment plant of the actual operation to provide technical basis. Research work is mainly achieved the following results: (l) renovation project acidification acidification tank water solution after three months, with the function of acidification, the first phase of the COD influent average of 519mg / l, the level of average of 414mg / l, the water is better, the average removal rate reached 21.24%; the second stage due to stay longer, acidification has more than staying in the hydrolysis and acidification stage, the production of acetic acid and methane phases are also the same time, the average effluent COD value of 55mg / l, the effluent averaged 507.8mg / l, the average removal rate of only 8.5 percent, to determine the best acidification stage hydraulic retention time of 12.6-13.7h. (2) the third stage in the hydrolysis acidification by reducing wastewater tanks residence time, increased sulfate analysis and detection, operational data analysis shows, pool acid hydrolysis of B / C ratio and COD removal rate is not ideal, the analysis found that due to There are a lot of industrial wastewater sulfate and sulfite and sulfate concentration by hydrolysis acidification reduced by 40%, which was mainly due to wastewater sulfate and sulfite in the hypoxic state of being as sulfate-reducing bacteria electron acceptor reduction generated hydrogen sulfide, hydrogen sulfide is dissolved in water as the COD. Effect the removal of hydrogen sulfide in the case, B / C increased after the hydrolysis acidification 0.05. (3) through the first series of A / O biological reactor operating parameters (hydraulic retention time, COD shock load) changes, the removal rate of COD study the impact, the results show that the first series of A / O biochemical reaction tank top HRT 12.8h, while fluctuations in water quality in the case, COD removal rate less affected, indicating that the hydrolysis acidification tank renovation project has played a COD reduction and reduce its volatility role, not only can reduce the load on subsequent aerobic biological treatment, can also reduce the impact fluctuations in water quality, play a stabilizing role in the system for the subsequent A / O Process has created favorable conditions. (4) through the first series of A / O biological reactor operating parameters (cycle ratio, hydraulic retention time) changes in research on ammonia nitrogen removal system the impact, the results showed that the recycle ratio of 189, HRT = 3.8h conditions, ammonia removal efficiency is higher. (5) After the original pool acid hydrolysis alterations compared with the Conversion of the former: Enter the biochemical system biodegradability of wastewater (B / C) from 0.38 to 0.45, an increase of 0.07 (18.4%), biochemical systems increased 13.8% COD removal ; BOD removal rate increased 6.32 percent. 2009 acidification (accident buffer) pool in operation, on the basis of the point sources into the biochemical system biodegradability of wastewater (B / C) further increased to 0.49 from 0.46, increased 0.03 (6.5%), COD removal rate increased by 3.75%; BOD removal rate also increased slightly. Running the debugger to determine the optimal process parameters, the system of major pollutants COD, ammonia nitrogen removal effect is obvious, the average removal rates were 91% guilty, 92.55%, the entire system is stable, the effluent COD, ammonia concentrations were lower in full compliance with the national \(5) After the original pool acid hydrolysis alterations compared with the Conversion of the former: Enter the biochemical system biodegradability of wastewater (B / C) from 0.38 to 0.49, an increase of 0.11 (28.95%), in running the debugger to determine the optimal process parameters conditions, the system of major pollutants COD, ammonia nitrogen removal effect is obvious, biochemical system COD removal increased 12.43%; ammonia removal efficiency increased by 5.6%, the entire system is stable, the effluent COD, ammonia concentration is low, full compliance with national \
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