Study On Integrated Wastewater Optimization In An Industrial Wastewater Treatment Plant

At present,along with the rapid development of the electronics industry,the production of industrial sewage,wastewater and waste liquid generated in the production process of the electronic industry has also greatly increased,especially in the production process of industrial chemical materials,intermediate by-products and electronic products.The flushing water of the pollutants,which are highly prone to cause widespread and serious effects.Although wastewater plants built or modified in many areas can meet the discharge standards,the treatment system of industrial wastewater plants is very fragile and susceptible to excessive raw water quality.Therefore,it is necessary to carry out a summary of the operational problems of industrial wastewater treatment plants and optimize the process.In this paper,an industrial wastewater treatment plant is taken as an example.During the operation of the plant,it was found that the water content of the MBR membrane system was seriously polluted due to the fluctuation of the influent water volume and water quality.According to this problem,the water quality of each stage of the process water was analyzed,which may be caused by the failure of the process water to remove fluorine and the poor effect of biochemical treatment.Through the research of fluorine-containing wastewater and organic wastewater in wastewater treatment plants,the anti-fluorination effect of biochemical system and the fluorine removal effect of fluorine-containing wastewater were tested,and the influent ratio and denitrification effect of integrated wastewater were optimized and the corresponding operation was obtained.Optimize the experimental results:(1)When the concentration of fluoride ion in the effluent of fluorine-containing wastewater is less than 10mg/L,the impact of fluoride ion on biochemical treatment can be reduced,and at the same time,the method of chemical precipitation + coagulation precipitation,when the fluorine-containing water fluoride ion is At 120 mg/L,the dosage of calcium chloride 2200 mg/L+PAM 18 mg/L can be used to reduce the fluoride ion concentration of the effluent wastewater to 10 mg/L.(2)When the fluorided wastewater after physical treatment and the organic influent enter the biochemical system at a ratio of 1:2,the wastewater mixed with fluorine and organic can be completely accepted and treated by the biochemical system;When the influent enters the biochemical system at a ratio higher than 1:1.46,the processing capacity of the biochemical system will decrease,and at the same time,the phenomenon that some pollutant removal rate is not up to standard may occur.At the same time,according to the actual situation of the sewage plant,when the carbon source is selected to be supplemented with organic raw water,the operating cost can be reduced while satisfying the supplementary carbon source,and the utility model has high practicability.According to the operation characteristics of the sewage plant in winter and summer,combined with the results of operation optimization experiment,the optimal operation strategy of the sewage plant for the whole season is established: in the summer,the calcium chloride + PAM combination is used for secondary treatment in the physicochemical treatment,which can effectively reduce the effluent.The F-concentration is below 12.6mg/L;the biochemical stage uses a 1:1.4 integrated wastewater influent ratio,supplemented with 5% organic raw water as a carbon source to meet the process water denitrification requirements;in winter,the physicochemical treatment section uses chlorine.Calcium + PAM combination for secondary treatment can effectively reduce the effluent F-concentration to less than 12.6mg / L;biochemical phase using 1:1.4 integrated wastewater influent ratio,at low temperature,biochemical system inlet end needs to add 11% organic The raw water is supplemented as a carbon source,which can meet the requirements of process water for nitrogen removal,and can maintain the total nitrogen effluent below 12.6mg/L and ammonia nitrogen below 8.4mg/L throughout the year.At the same time,using this operation strategy,the unit consumption of the physicochemical section can be reduced by 0.08 yuan/ton compared with last year,the operating cost of saving medicines is 376,000 yuan,the power consumption consumption is reduced by 1.5kwh/ton in winter,and 5.9kwh/ton in summer,and the annual cost is saved.About 147,800 yuan.Through the application of the above-mentioned process operation strategy,it is possible to solve the problems that the effluent of the fluorine-containing wastewater exceeds the standard and the denitrification effect of the biochemical system is not good.At the same time,the production operation parameters provided by the process operation strategy guide the actual process production operation,adjust the physical and chemical treatment using the chemical combination,the dosage and the additional amount of supplemental carbon source,and supplement the way to reduce the process operation cost,thereby reducing the unit consumption of the overall treatment wastewater.To achieve efficient,stable and low-energy operation of the integrated wastewater treatment plant of the electronic industry,and to ensure the discharge of the electronic industrial wastewater treatment plant.