垃圾渗滤液深度处理的混凝-UV-O3组合工艺试验

Experimental study on the coagulation/UV/O3 process used in advanced treatment of landfill leachate

老龄的垃圾渗滤液经过生化处理之后仍然不能达标排放,需要进行深度处理。本文采用混凝/UV/O3组合工艺对经氧化塘出水的垃圾渗滤液进行了深度处理的试验研究,探索了较优的组合处理工艺条件。结果表明:在混凝反应阶段,当pH值为5、PFS投加量为1 200 mL(100 g/1 000 mL)、PAM投加量为1 000 mL(1 g/1 000 mL),COD去除率可达60.2%;在光化学反应阶段,当反应时间为60 min、pH值为9、紫外光照强度为3.8 W·L-1、臭氧通气量为80 L·h-1,COD去除率可达79.1%。该组合工艺对水样的COD综合去除率为91.7%,最终出水COD值由1 560 mg·L-1降低至130 mg·L-1,出水可接近GB16889-2008排放标准。同时,研究结果还表明了混凝与光化学处理工艺组合应用的必要性,与单纯的UV/O3光化学处理工艺相比,混凝/UV/O3组合处理工艺对垃圾渗滤液COD的去除率提升了23.5%。

The aged landfill leachate is still unable to reach the standard after biochemical treatment and needs to be treated in depth.In this paper,the coagulation/UV/O 3 combination process was used to investigate the advanced treatment of landfill leachate treated by oxidation pond.The results showed that the optimal reaction conditions were:the condition of the coagulation reaction stage was pH=5,the dosage of PFS was 1200 mL(100 g/1 000 mL),and the dosage of PAM was 1 000 mL(1 g/1 000 mL),and COD removal rate is 60.2%;The photochemical reaction stage conditions are 60 min,pH=9,ultraviolet light intensity is 3.8 W·L-1,and ozone ventilation is 80 L·h-1,and COD removal rate is 79.1%.Overall,the combined process has COD removal rate of 91.7%for wastewater.The final effluent COD value was reduced to 130 mg·L-1.At the same time,the study emphasizes the importance of the combined application of coagulation and photochemical reaction units.The COD removal rate of the coagulation/UV/O 3 combination process is 23.5%higher than that of the coagulation/UV/O 3 process.