| Watershed components petrochemical complex, high concentrations of organic pollutants, toxic intensity, are more difficult to deal with industrial wastewater. At present, the existing large petrochemical enterprises of sewage treatment plants commonly used in secondary treatment, but because of changes in petrochemical wastewater quality and quantity larger and higher pollution load, the existing sewage treatment plant removal of volatile organic compounds are present and ammonia to In addition to poor capacity problems. The topics to study petrochemical wastewater, wastewater discharge for large petrochemical complex components, and poor biodegradability characteristics, through a large petrochemical wastewater treatment plant hydrolytic acidification-A / O process engineered to run debugging, its treatment of petrochemical wastewater treatment effect, processing mechanism and process adaptability of the study, by analyzing the changes of water quality parameters obtained hydrolysis + A / O process of the optimal control parameters for the treatment of refractory chemical industrial park similar to the sewage treatment plant provide technical basis for the actual operation. Main research achieved the following results:1. Hydrolysis reconstruction solution acidified water pool after 3 months, with the function of hydrolysis acidification, the first phase of the average influent COD, 519mg / l, the average water 414mg / l, the water better, The average removal rate of 21.24%; the second phase of the residence time is longer, has more than stay in the Hydrolysis and acidification stage of hydrolysis, acetic acid and methane production phase also at the same time, the average effluent COD 55mg / l, the average water 507.8mg / l, average removal rate of only 8.5%, and to determine the best Hydrolysis stage HRT 12.6-13.7h.2. The third phase of acidification by reducing the pool of water in the hydrolysis of the length of stay, increased sulfate determination, running the data analysis showed that the hydrolysis acidification pool B / C ratio and the COD removal rate is not ideal, the analysis found that due to industrial waste water There are a lot of sulfate and sulfite, and sulfate concentration after acidification by hydrolysis decreased by 40%, mainly due to waste water due to sulfate and sulfite in the hypoxic state is affected by sulfate-reducing bacteria as an electron restore the body produces hydrogen sulfide, hydrogen sulfide dissolved in water acts as a COD. In the case of removal of hydrogen sulfide, B / C increased by 0.05 after hydrolysis acidification.3. Through the first series of A / O biological reaction cell operating parameters (hydraulic retention time, COD shock load) change of system impact on COD removal rate, the results show, the first series of A / O biochemical reactions HRT is the best pool of 12.8h, while fluctuations in water quality case, COD removal rate of the impact on smaller, indicating the hydrolysis acidification tank renovation project has played a reduction of COD and reduce its volatility in the role, not only can reduce the load on subsequent aerobic treatment can also reduce the impact of water quality fluctuations, play a role in stabilizing the system for follow-up A / O Process has created favorable conditions.4. Through the first series of A / O biological reaction cell operating parameters (cycle ratio, hydraulic retention time) change of the system on the impact of ammonia nitrogen removal rate, the results show that the ratio in the loop 189, HRT = 3.8 h under the conditions of high ammonia removal.5.Hydrolysis pool into the original post with the conversion before the comparison: the wastewater into the biochemical system biodegradability (B / C) increased to 0.45 from 0.38, an increase of 0.11 (28.95%), biochemical systems improve COD removal efficiency of 13.8%; BOD removal rate increased 6.32%. Debugging to determine the optimal running conditions, process parameters, the system of major pollutants COD, ammonia nitrogen removal was the average removal efficiency was 12.43%, 5.6%, the entire system is stable, the effluent COD, ammonia nitrogen concentration low, fully in line with the national "Integrated Wastewater Discharge Standard" (GB8978 - 1996) a standard.
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