Study on Treatment of High Concentration Wastewater From Production of Methyl 3,3-Dimethyl-4-pentenoate
The pretreatment of high concentration wastewater from the production of methyl 3,3-dimethyl-4-pentenoate by Fe/C micro-electrolysis coupled with Fenton process was studied,under the optimized reaction conditions,the effluent after the oxidation was neutralized,flocculated and precipitated,the average removal rate of COD reached 54%,and B/C increased from 0.11 to 0.34.The wastewater after oxidation pretreatment entered the biological multiplication system,after domestication and cultivation,the sludge mass concentrations in the facultative and aerobic areas of the biological multiplication system were 10.4 g·L-1and 11.5 g·L-1 respectively,it was 1.7 times more than traditional sludge.The salt tolerance of the system was acclimatized by gradually increasing the salt mass concentration of the influent water,when the salinity reached 10 000 mg·L-1,the average mass concentrations of COD,NH3-N and TN in the effluent were below 400 mg·L-1,15 mg·L-1and 35 mg·L-1.For production wastewater with high concentration,when the whole process was running,the mass concentrations of COD,NH3-N and TN in the final effluent were below 400 mg·L-1,5 mg·L-1and 20 mg·L-1 respectively,and the average removal rates were 94.5%,97%and 90%respectively.
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