厌氧悬浮床/潜流湿地处理生活污水

为开发适于处理村镇生活污水的高效而经济的工艺，将厌氧悬浮填料床和波式潜流人工湿地工艺串联起来，其中短HRT厌氧单元在较大程度上发挥了将颗粒有机物转化为溶解性有机物的作用，为后续湿地处理提供了有利的条件。与传统潜流湿地比较，波式潜流湿地优化了水力流态。使污水反复与湿地系统的上层、中层和下层的微生物、根系和介质接触，充分发挥了湿地系统降解污染物的能力。试验结果表明：当厌氧床的HRT为3h、波式潜流湿地的HRT为5．6d时，该系统能够同时高效去除生活污水中COD、TN、NH4^ —N、TP和SS等污染物，出水水质优于《城镇污水处理厂污染物排放标准》(GB18918—2002)中一级标准的B标准；冬季低温期间系统处理效果有一定程度下降，但未出现恶化现象；该系统适于处理居住密度不高、冬季冰冻期短的村镇生活污水。

Anaerobic Suspended Packed Bed/Wavy Subsurface Flow Constructed Wetland Process for Treatment of Domestic Sewage

In order to develop high efficient and economical process for treatment of domestic sewage,suspended packed bed/wary subsurface flow constructed wetland process were operated in series.In which,the anaerobic unit with short HRT made more contribution to the conversion of particulate organic matter into dissolved one,so as to provide favorable condition for the treatment of constructed wetland.As compared with traditional subsurface constructed wetland,wavy subsurface constructed wetland (W-SFCW) optimized hydraulic flow pattern,so that sewage made repeated contact with microbe,root zone,and ground media at upper,middle,and lower layer of W-SFCW system,and thus bringing into a play its role in degradation of pollutants.The test results show that when the HRT of anaerobic stage is 3 h and that of W-SFCW stage is 5.6 d,the system can efficiently remove COD,TN,NH~+_4-N,TP,and SS from domestic sewage,and the effluent quality exceeds B-class criteria specified in Discharge Standard of Pollutants from Municipal Wastewater Treatment Plant (GB 18918-2002).During low temperature in winter,treatment effect of the system is somewhat reduced,but no deterioration is observed.The system is suitable to treat the domestic sewage in the towns with low residential density and short period of freezing in winter.