化工强化-生物反应器深度处理草甘膦废水研究

Study on Advanced Treatment of glyphosate wastewater Process Effect by Chemical process enhancement-bioreactor technology

对江苏某化工厂经过四效浓缩预处理的草甘膦废水采用厌氧生化处理系统+好氧生化处理系统+化学深度除磷组合工艺1与厌氧生物处理系统+好氧生物处理系统+反硝化生化处理系统+化学深度除磷组合工艺2进行处理。结果表明,生物处理系统进水pH控制为中性,停留时间控制为6 h,生化装置控温30~35℃,厌氧、好氧、反硝化溶解氧的质量浓度分别控制在<0.5、>7、<0.5 mg/L,添加4 g/L聚合氯化铝铁进行深度除磷,1 g/L聚丙烯酰胺混凝沉淀。组合工艺1出水中COD和TP、NH_(3-)N、TN的质量浓度分别达到52.3 mg/L和0.601、0、16.9 mg/L,其中COD和TP、NH_(3-)N满足GB 18918-2002的一级标准;组合工艺2使TN的质量浓度降低至3.63 mg/L满足GB 18918-2002)一级标准,且运行效果稳定。

The glyphosate wastewater treated with four-effect concentration pretreatment from a chemical plant in Jiangsu province was selected as the research object to verify the treatment effect of combination process 1 composed of anaerobic biochemical treatment system,aerobic biochemical treatment system and chemical phosphorus removal treatment system and combination process 2 composed of anaerobic biological treatment system,aerobic biological treatment system,denitrification biochemical treatment system and chemical phosphorus removal treatment system,based on chemical process enhancement-bioreactor technology.The pH value of the influent of the biological treatment system was set as neutral.The residence time of the biological treatment system was controlled for 6h,and the temperature of the biochemical device was controlled at 30~35℃.The oxygen content was controlled below 0.5 mg/L for anaerobic,above 7 mg/L for aerobic,and below 0.5 mg/L for denitrification.4 g/L polyaluminferric chloride(PAFC)was used for chemical depth phosphorus removal,and 1 g/L polyacrylamide(PAM)was used as flocculation sedimentation.The results showed that COD and TP,NH3-N,TN in the effluent reached 52.3 mg/L and 0.601 mg/L,0 mg/L,16.9 mg/L respectively under the combined process 1,and the corresponding removal rates were 99.2%,94.84%,100% and 55.44% respectively,among which COD and TP,NH3-N met the first-grade standard of GB 18918-2002.In order to cope with the future development trend of environmental protection,the mass concentration of total nitrogen(TN)in the effluent was further reduced,and the combined process 2 was designed to reduce the TN content to 3.63 mg/Lsuccessfully,and the removal rate increased to 99.72%,which met the first-level standard of GB 18918-2002,and the operation effect was stable.