【摘要】 通过对贵州省内运行的8个土地处理示范工程进、出水水质和土壤性质变化的监测,表明污水土地处理对生活污水有较好的净化效果,在进水BOD5≯150 mg/L、COD≯250 mg/L的情况下,出水水质基本上能达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级B标准;只要设计、管理得当,其服务年限可以维持8年以上,其间土壤理化性质变化不大,对环境无负面影响。由于土地处理无强化的脱氮单元,对TN去除效果较差,有待于今后优化脱氮工艺,增加相关设施。更多还原

【Abstract】 In this study we investigated sewage inflow,effluent and soil property from eight demonstration projects of wastewater land treatment in use in Guizhou province.It revealed that the land treatment system showed good purification for sewage: the effluent can satisfy the Class 1-B of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918—2002) given that the inflow BOD5 and COD level was below 150 and 250 mg/L respectively.With proper design and maintenance,the expected life of the land treatment system can be longer than eight years when there was no deterioration in soil property,or negative impacts to the environment.Due to lack of fortified denitrification unit,the total nitrogen removal efficiency is low,and optimization of the system was needed.更多还原