CAJ | 학술논문

糖蜜酒精废水经过光合细菌处理后，BOD5和氨氮均能达到GB8978-1996二级排放标准，但CODcr仍然上千。本文进行了化学混凝法处理光合细菌法出水的试验，研究了几种混凝剂在不同投药量、pH及投加阳离子聚丙烯酰胺情况下的混凝效果。结果表明，投加FeCl3和聚合硫酸铁使CODcr的去除率达到70%以上，可以达标。投加阳离子聚丙烯酰胺试验结果表明其对絮体的形成、絮体大小及分离速度有帮助，但对CODcr的削减作用不大。该废水含有较高的碱度，投加混凝剂后引起pH下降导致CO2气体析出与絮体结合后带动絮体上浮。
당밀주정폐수경과광합세균처리후，BOD5화안담균능체도GB8978-1996이급배방표준，단CODcr잉연상천。본문진행료화학혼응법처리광합세균법출수적시험，연구료궤충혼응제재불동투약량、pH급투가양리자취병희선알정황하적혼응효과。결과표명，투가FeCl3화취합류산철사CODcr적거제솔체도70%이상，가이체표。투가양리자취병희선알시험결과표명기대서체적형성、서체대소급분리속도유방조，단대CODcr적삭감작용불대。해폐수함유교고적감도，투가혼응제후인기pH하강도치CO2기체석출여서체결합후대동서체상부。
After treated by PSB(Photosynthetic Bacteria)process,thesugar-syrup alcohol wastewater can meet the national discharge requirements(GB8978-1996)in terms of BOD5 and ammonia,but its CODcr concentration is still more than 1000 mg.L-1.Because of the low biodegradability of the effluent,coagulation was chosen as the polishing treatment before discharge.In this study four coagulants were investigated on their optimal dosage and CODcr removal performance.The results showed that CODcr concentration could be reduced below 300 mg.L-1 with FeCl3 and PFS as the coagulants.The influence of PAM was also studied.The result showed that there were no significant promotions of the COD removal efficiency in presence of PAM,but the settling velocity of the flocs did increased drastically.Due to the high alkalinity of the effluent,a lot of fine CO2 bubbles were formed and released after the effluent was mixed with acidic coagulants,which made the floc rise to the surface instead of settling to the bottom.