| A pharmaceutical company in Jiangxi mainly produces penicillin,sulbactam and tazobactam acid.A large amount of high-concentration organic wastewater is produced in the production process.The original process of the wastewater station was mainly biological treatment.Due to the increasing original load,the wastewater system was unable to meet the production requirements and emission standards.After research and analysis,based on the original biochemical process “anaerobic pool-aerobic tank-A/O”,“iron-carbon micro-electrolysis-Fenton-coagulation sedimentation” was used to pretreat the high concentration wastewater.The physicochemical process could make sure that the wastewater entering the biochemical system meet the requirements.After the completion of the process transformation,the indicators of the new system effluent meet the takeover standards of the park sewage treatment plant.This topic mainly discusses the experimental study on the optimal operating parameters of antibiotic wastewater treatment by physicochemical processes such as iron-carbon microelectrolysis,Fenton oxidation and coagulation sedimentation;and the engineering debugging of the physicochemical combination process + biochemical system.The main contents and conclusions of the study are as follows:(1)Through literature review and experimental research,the various factors affecting the antibiotic pharmaceutical wastewater treatment by iron-carbon microelectrolysis-Fenton oxidation combined process were tested,and the best parameters of the process were: iron-carbon micro-electrolysis process water p H=3.5,iron-carbon filler solid-liquid ratio 350g/L,reaction time 2h.After operation,the COD removal rate can reach 27.6%,and the effluent COD was 29945mg/L.The kinetic equation for the degradation of the antibiotic wastewater by iron-carbon microelectrolysis was in accordance with the three-stage reaction,and the rate equation is fitted (?).The optimal operating parameters of the Fenton process are initial p H = 3,n(H2O2)/n(Fe2+)=3 The dosage of H2O2 was 20ml/L and the reaction time was 2.5h.Under the condition of this parameter,the COD removal rate could reach 31.5%,and the effluent COD was 20512mg/L.The kinetic rate equation for the degradation of the pharmaceutical wastewater by Fenton can be expressed as (?).Under the combined process conditions,the average COD of high concentration wastewater decreased from 41360 mg/L to 20512 mg/L,and the COD removal rate reached 50.4%.(2)After the wastewater was mixed,the COD of the integrated pond effluent was 7000mg/L~8000mg/L,the dosage of PAC was 600mg/L,and the dosage of PAM was 50mg/L.After coagulation and air flotation treatment,it enters the biochemical system.The COD value was 6000 mg/L to 7000 mg/L.After the first-stage anaerobic-aerobic unit was successfully commissioned,the effluent COD was stable at about 3430 mg/L,the average removal rate was over 50%,and the average effluent ammonia nitrogen was 83 mg/L.(3)After the two-phase A/O system was stabilized,the average concentration of NH3-N in the process biochemical system was 209mg/L,and the average value of the first-stage A/O influent COD was 3430mg/L.After the treatment,the final effluent COD averaged 256 mg/L and NH3-N was 21 mg/L.The COD removal rate of the entire biochemical process reached 95.7%,and the NH3-N removal rate reached 90%.The effluent completely met the takeover standards of the park sewage treatment plant.(4)Without considering the depreciation of equipment,the comprehensive calculation of wastewater operating cost was 14.9 yuan/m3;after the normal operation of the wastewater station,the total COD emission can be reduced by 1587 tons and ammonia nitrogen emissions by 51 tons. |
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