| There is always a lot of difficulty in the treatment of wastewater created in chemical medicine synthesis.Synthetic pHarmaceutical wastewater has the characteristics of complex composition,large fluctuation of water quality and quantity,high COD,high content of refractory organic substance,high salt concentration and high toxicity.If the source of wastewater is not thoroughly analyzed,the classification and collection of wastewater is not clear,the preparation of pretreatment scheme is insufficient,the choice of neutralizing agent is wrong,the parameters of operation and control process are not properly set,the design of biological treatment unit is unreasonable,which will cause the whole sewage treatment system to run improperly,even the paralysis of the system.This is a study on the transformation of wastewater treatment in a pHarmaceutical enterprise.Firstly,the source of wastewater and the characteristics of water quality are nvestigated by sampling and monitoring the waste water.Secondly,the source of pollution is analyzed systematically.Finally,the effect of wastewater treatment of the existing process is tracked and tested,the collection method,pretreatment scheme,neutralizing agent,operation parameters,design and treatment capacity of biological treatment unit are also analyzed,and the defects of sewage treatment system are combed.Taking fully into account the results of pollution source analysis and the shortcomings of existing sewage treatment systems,the improvement scheme is formulated in combination with the relevant references.In order to verify the feasibility of the transformation scheme,avoid the risks brought by the direct engineering transformation,and find out a set of feasible schemes for the concrete project implementation and operation management in the future,we decided to carry out a pilot study.(1)The results show that the COD and Findexes were up to the standard simultaneously when the initial pH value of raw water was 5,the optimum mass ratio of neutralizing agent to alkali ash is 4:1.(2)The study shows that the optimum molar ratio of calcium and chloride is 2:1,and the removal rate of fluoride ion is 64.35%,when pH value of the raw water is set at 7,the reaction temperature is 30~o and the reaction time is 50min.The optimum mole ratio of PAC and fluoride 200:1.(3)The research shows that the average removal rate of COD and the hydrolysis rate of organic nitrogen organic nitrogen of expanded granular sludge bed(EGSB)72.46%,90.26%,respectively,by contrast,that of mud pool was62.17%,80.41%,respectively.The removal rate of COD was 14.20%higher than that of sludge tank and the hydrolysis rate of organic nitrogen was 9.85%higher than that of sludge tank.After three months’trial operation of sewage treatment system,the pollutant indicators of each treatment unit were monitored.The defluorination effect of the treatment unit obviously make a great improvement through isolated collection and treatment of the high fluorine wastewater.The source strength of pollutants decreased significantly with single collection of high salt distillation mother liquor.The problem of sludge calcification in biological treatment stage was solved by using liquid alkali instead of lime as neutralizing agent.At the anaerobic treatment stage,the addition of EGSB reactors improve the total amount of COD removal and the hydrolysis rate of organic nitrogen.The way that the original membrane reactor was transformed into aerobic tank increase the total removal amount of ammonia nitrogen removal.With the modification of the system,all the indexes of the effluent achieve the discharge standard of the wastewater treatment plant in the park,and the cost of the wastewater treatment has also decreased by 18.1%. |
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