Sehar Shama, Aamir Rabia, Naz Iffat, Ali Naeem, Ahmed Safia
Microbiology Research Laboratory, Department of Microbiology, Quaid-i-Azam University, Islamabad 45320, Pakistan.
ISRN Microbiol. 2013 May 2;2013:350260. doi: 10.1155/2013/350260. Print 2013.
The current research was focused mainly on the designing and construction of efficient laboratory scale hybrid constructed wetland (HCW) for the treatment of domestic wastewater. Parameters like COD, BOD5, PO4, SO4, NO3, NO2, and pathogenic indicator microbes were monitored after hydraulic retention time (HRT) of 4, 8, 12, 16, and 20 days. Treatment efficiency of HCW kept on increasing with the increase in hydraulic retention time. Maximum efficiency of HCW was observed with a 20-day HRT, that is, 97.55, 97.5, 89.35, 80.75, 96.04, 91.52, and 98.6% reduction from the zero time value for COD, BOD5, PO4, SO4, NO3, NO2, and fecal coliforms, respectively. After 20 days' time, the treated water was free of almost all nutrients and microbial pollutants. Hence, increasing hydraulic retention time was found to ameliorate the operational competence of HCW. Thus HCW can serve as a promising technology for wastewater treatment and can be scaled up for small communities in the developing countries.
当前的研究主要集中在设计和构建高效的实验室规模混合人工湿地（HCW）以处理生活污水。在4、8、12、16和20天的水力停留时间（HRT）后，对化学需氧量（COD）、五日生化需氧量（BOD5）、磷酸根（PO4）、硫酸根（SO4）、硝酸根（NO3）、亚硝酸根（NO2）和致病指示微生物等参数进行了监测。HCW的处理效率随着水力停留时间的增加而不断提高。在20天的水力停留时间下观察到HCW的最高效率，即相对于零时刻值，COD、BOD5、PO4、SO4、NO3、NO2和粪大肠菌群分别降低了97.55%、97.5%、89.35%、80.75%、96.04%、91.52%和98.6%。20天后，处理后的水中几乎没有所有营养物质和微生物污染物。因此，发现增加水力停留时间可改善HCW的运行能力。因此，HCW可作为一种有前景的废水处理技术，并可扩大规模应用于发展中国家的小社区。
