不同水力停留时间对含聚丙烯酰胺污水厌氧生物处理的影响

Effect of Different Hydraulic Retention Time on the Anaerobic Biodegradation of Wastewater Containing Polyacrylamide

采用四格室厌氧折流板反应器(ABR)在常温下处理油田含部分水解聚丙烯酰胺(HPAM)的污水。通过优化运行参数,确定了对含HPAM污水处理的最适水力停留时间(HRT)和有机负荷(OLR)。在厌氧处理过程中,OLR为1、1.3、2和4kg COD/m3.d时对应的HRT分别为24、18、12与6h。研究结果表明,ABR在水力停留时间为24h时,系统对CODCr和HPAM的去除率达到最高,分别为0.945和0.662;当HRT为6h时,系统的pH、CODCr和HPAM的降解率明显下降,挥发性脂肪酸大量积累。通过对降解前后HPAM的红外光谱分析可知,ABR能形成对HPAM有较好降解效果的微生物群落,微生物菌落能够利用HPAM作为碳源和氮源供自身生长所需。

A four-compartment anaerobic baffled reactor （ABR） was used to treat oilfield wastewater containing partially hydrolyzed polyacrylamide （HPAM） at room temperature. Inoculums digested sludge was taken from a wastewater treatment plant in Qingdao. During the anaerobic treatment, the hydraulic retention time （HRT） decreased from 24h to 6h as the ABR fed with organic load rate （OLR） of 1, 1.3, 2 and 4kg CODcr/m3 ＂d, respectively. When HRT was 24h, average chemical oxygen demand （CODcr） and HPAM removal rate could reach up to 0. 945 and O. 662, respectively. The value of pH, CODcr and HPAM removal decreased sharply when HRT declined to 6h. The volatile fatty acids accumulated rapidly in effluent. Based on the IR analysis of HPAM, it could be inferred that microbial consortium with a better HPAM-utilizing ability could be enriched in the ABR reactor. Furthermore, the microorganism could use HPAM as the sole source of carbon and nitrogen nutrition for their growth.