3种组合工艺处理农村生活污水

Treatment of rural domestic wastewater by three combined processes

进行了厌氧折流板反应器-垂直潜流人工湿地(ABR-VSFCW)、复合厌氧反应器-水平潜流人工湿地(HAR-HSFCW)、膨胀颗粒污泥床-人工快速渗滤系统(EGSB-CRI)3种组合工艺处理农村生活污水的研究。结果表明,在温度为10~29℃,进水COD为325.3~386.5 mg/L的条件下,3种组合工艺对COD均有较高的处理效果,当厌氧段HRT大于16 h时,3种组合工艺出水COD浓度均达到了我国《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准;EGSB-CRI、HAR-HSFCW对TP的去除效果较好,出水TP浓度均达到了我国《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准,且显著优于ABR-VSFCW,ABR-VSFCW出水TP浓度达到了二级标准;ABR-VSFCW、HAR-HSFCW、EGSB-CRI出水NH+4-N浓度分别为25.24~42.20、29.59~41.60和9.80~15.35 mg/L,其出水NH+4-N浓度达到了我国《城镇污水处理厂污染物排放标准》(GB 18918-2002)二级标准;3种组合工艺对TN的去除效果无明显差异,去除率仅为23.9%~46.4%。因此,EGSB-CRI对农村生活污水的处理效果最好,HAR-HSFCW次之,ABR-VSFCW较差。

The performance of three combined processes( anaerobic baffled reactor-vertical subsurface flow constructed wetland( ABR-VSFCW),hybrid anaerobic reactor-horizontal subsurface flow constructed wetland( HAR-HSFCW) and expanded granular sludge bed-constructed rapid infiltration system( EGSB-CRI)) treating rural domestic wastewater was investigated. The results showed that the three combined processes exhibited good ability in COD removal at 10 ~ 29℃ and influent COD of 325. 3 ~ 386. 5 mg / L,meanwhile,in anaerobic period of HRT was more than 16 h,effluent COD of three kinds of combination processes met the first grade B standards of disc harge standard of pollutants for municipal wastewater treatment plant( GB18918-2002). The TP removal efficiencies of EGSB-CRI and HAR-HSFCW were higher than that of ABR-VSFCW,and the effluent TP of both met the first grade B standards of GB 18918-2002. In comparison,the effluent TP of ABR-VSFCW met the second grade standards of GB 18918-2002. The effluent NH+4-N concentration of ABR-VSFCW,HAR-HSFCW and EGSB-CRI were 25. 24 ~ 42. 20 mg / L,29. 59 ~ 41. 60 mg / L and 9. 80 ~ 15. 35 mg / L,respectively. The effluent NH+4-N concentrations of EGSB-CRI met the second grade standards of GB 18918-2002. For the three combined systems,the TN removal efficiencies were 23. 9% ~ 46. 4% and had no significant difference. Therefore,the performance of EGSB-VSFCW treating rural domestic sewage is best,HAR-HSFCW second,ABR-VSFCW is the worst.