Study On Treatment Of Waste Water Containing HPAM With Anaerobic Biodegradation

Nowadays,oilfield produces amount of oily sewage,which contained large amountsof Hydrolyzed polyyacrylamide （HPAM）．The HPAM is accumulated and transformedin the environment,producing a lot of waste water and sludge containing refractory,toxic and hazardous pollutants. Due to the biological method is lower-cost,unstableand no secondary pollution in the environment and so on. In this paper anaerobicbaffle reactor were utilized to treat the waste water containing HPAM.In addition,themechanisms of the anaerobic baffle reactor were also analyzed.I selected two strain bacterias which can degrade the polyacrylamide from QingdaoShaZiKou sewage treatment plant of sludge.And we evaluated comprehensively thetwo strains of bacteria for the degradation of HPAM. The nutrients and conditions areoptimized.After fermenting, we take the two plant functional degradation bacterias tothe anaerobic baffle reactor which can used in the degradation of HPAM. All theconclusions were as follows:1) SRB bacteria was screening from Qingdao ShaZiKou anaerobic activated sludge.And another bacteria which is named PAM-F1was screening from daqing oil field inwastewater containing HPAM.And through carring on the ecological moleculebiology identification, it was identified as Rhodococcus. They physiological andbiochemical properties were identified. The impact of environmental conditions onthe degradation of polyacrylamide of SBR and PAM-F1were studied. The resultsshowed that when nitrogen source for ammonium sulfate, pH7-8, temperature is35-℃, salinity is15g/L, simulation including poly sewage for200mg/L, sulfuric acidroot ion concentration is25mg/L （PAM-F1from sulfuric acid root ion concentrationlimit）, the strain on the degradation of HPAM is the largest, the removal rate was45% and35%respectively.2) The results showed that SRB and PAM-F1could utilize amido in the side chainof HPAM and part of carbon in the main chain of HPAM as sole source of nitrogenand carbon respectively based on the analysis of IR before and after degradation.3) Processing the wastewater containing partially hydrolyzed polyacrylamide（HPAM） is with four compartments anaerobic baffle reactor （ABR） in normaltemperature. Through optimizing the operation parameters, we can make the besthydraulic retention time （HRT）, volume load （VLR） and return ratio （R）. In anaerobictreatment process, when HRT were24h, and18h,12h and6h. The correspondinghydraulic load were1kgCOD_Cr/m³.d,1.3kgCOD_Cr/m³.d,2kgCOD_Cr/m³.d,4kgCOD_Cr/m³.d.The results of the study show that: When the HRT is24h, the systemof COD_Crand HPAM removal rate was highest at94.5%and66.2%respectively.When return ratio is10:1, the COD_Crand HPAM removal rate can achieve maximum.4) After three stages of inoculating culture, ABR can form activity anaerobicgranular sludge. The results show that the microbial community structure in ABRreactor can adapt to the environment of HPAM.