| A pharmaceutical company in Jiangxi produces chemical substances such as tazobactam and sulbactam antibiotics by chemical synthesis.The resulting process wastewater has the following characteristics:high concentration of pollutants,complex components,large biological toxicity,and hard to degrade.The original treatment process cannot meet the standard of the wastewater treatment.According to the requirements of the owners,a wastewater treatment system of 1050m3/d is needed to be rebuilt,and the high concentration wastewater with a concentration of 3500050000mg/L is treated to meet the needs of production.Based on the water quality characteristics of waste water,after research and analysis,it was decided to use Fe-C+Fenton+coagulation+hydrolysis acidification+IC+A/O+BAF treatment process to treat the high concentration wastewater of the company.After a period of start-up and commissioning,it entered a stable operation.The results of the operation showed that the indicators of the effluent of the process system after the completion of the process were stable to the acceptance criteria of the park's sewage treatment plant.This project aimed at the physical and chemical pretreatment process in the treatment of this high concentration of antibiotic wastewater,the process parameters to be determined for a small pilot test study.The start-up and commissioning of the biochemical treatment process to treat this high-level antibiotic wastewater was studied and analyzed.Research indicates:?1?The Fe-C micro-electrolysis process treats high-concentration antibiotic wastewater.The primary and secondary effects of the experiment are:solid-liquid ratio,reaction pH,and reaction time.The optimum process parameters are:the pH of influent water is adjusted to 3,the solid-liquid ratio is controlled at 40%,and the reaction is 2h.The average COD removal rate is 23%,and the average removal rate of NH3-N is 9%.?2?The Fenton process treats high-concentration antibiotic wastewater.The experimental results show that the degree of influence is:H2O2 dosage,reaction time,pH value of the reaction and FeSO4·7H2O dosage.The optimum process parameters were as follows:the influent pH was adjusted to 3.5,the H2O2 dosage was 14 ml/L,the FeSO4·7H2O dosage was 2 g/L,and the reaction was 60 min.The average COD removal rate is 38%,and the average removal rate of NH3-N is 12%.?3?The coagulation and sedimentation process is used to treat high-concentration antibiotic wastewater,and the best coagulation reagent for wastewater is PAC.The best process parameters for determining PAC coagulation sedimentation by small-scale test are as follows:Influent pH is adjusted to 8,and PAC is The addition amount was 300 mg/L,rapid stirring?250 r/min?for 3 min,slow stirring?50 r/min?for 10 min,and sedimentation for 40 min.The average COD removal rate is 32%,the average NH3-N removal rate is 9%,and the average SS removal rate is 85.7%.?4?Optimize the optimal reaction conditions for optimizing the physicochemical test reaction through combinatorial optimization experiments.Through the experiment,it is found that the effluent pH of the influent Fe-C process can be adjusted to 2.5,which not only increases the removal rate of pollutants,but also conforms to the pH requirements of the influent in the Fenton process.The influent pH requirements:In the case of not adding FeSO4·7H2O,the reaction removal rate has little effect,but also can save a certain operating cost;Fenton reaction carrier gas can increase the removal rate of pollutants:in the coagulation After adding a certain amount of PAM in the reaction,the removal rate of SS increased to 92.1%.The adjustment of pH by lime can remove most of the SO42-,which is conducive to stable operation of the anaerobic process.Through the combination of optimization tests,the overall physicochemical treatment process has a certain increase in the removal rate of pollutants.?5?In the actual project operation,the influent COD concentration of the physical pretreatment in the range of 3800052000mg/L fluctuates.It can be seen that the water quality of the antibiotic wastewater fluctuates greatly and the effluent COD is in the range of 1200017000mg/L.The average COD removal is The rate is more than 60%,the treatment effect is stable and reliable;the influent NH3-N fluctuates in the range of 350-700mg/L,while the effluent NH3-N is in the range of 200-550mg/L,and the average NH3-N removal rate is about 30%.,With a certain amount of NH3-N removal capacity.The wastewater concentration in the process of hydrolysis and acidification fluctuates from 7000 to 10000 mg/L.After more than one month of startup and commissioning,the effluent is stable at between 5000 and 8000 mg/L.The average removal rate of COD is above 20%.Biochemical improvement.After more than 3months of commissioning,the IC reactor operated stably,the influent COD concentration was between 6000 and 7000 mg/L,the effluent COD concentration was between 1100 and 1500 mg/L,and the average COD removal rate was above 80%.After the A/O process is started,the effluent COD concentration is in the range of 200-350 mg/L,the average COD removal rate is above 75%,the influent ammonia nitrogen concentration is 160-220 mg/L,and the effluent ammonia nitrogen concentration is 30-60 mg/L.The average removal rate of ammonia nitrogen is above 75%.After the BAF process is started,the effluent COD concentration is about 100mg/L,the average COD removal is above 65%,the effluent ammonia nitrogen concentration is 1520mg/L,and the average ammonia nitrogen removal rate is above 60%.After the entire biochemical process is started,it enters a stable operation period. |
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