摘要
取吸附-生物降解（AB）工艺A段沉淀池出水,利用投加硫酸铝（AS）和聚丙烯酰胺（PAM）化学强化后的沉淀污泥进行除磷实验,考察沉淀污泥除磷效果和化学强化对污泥沉降性能的影响。结果表明：化学强化的沉淀污泥对污水的TP和浊度有较好的去除效果,其去除率随AS投药量的增加而提高;当泥水比为66.7%,PAM为0.05mg/L,AS投药量（以Al2O3计,下同）为15.1 mg/L时,对TP和浊度的去除率分别为75.0%和60.9%;AS投药量从0 mg/L增加至15.1mg/L,沉淀污泥对COD去除率维持在23%-40%,对氨氮无去除作用;同一投药量（AS为7.5 mg/L,PAM为0.05 mg/L）下,TP去除率随泥水比增大而提高,氨氮质量浓度无明显变化;投加AS和PAM化学强化除磷,污泥沉降比和体积指数随AS投药量增加而降低,污泥沉降性能提高。
This paper is engaged in the study of the phosphorus-removing efficiency by using the sediment sludge and the effect of the aluminum sulfate dosage on the settleability of active sludge. In our study, we have experimented with a new treatment to enhance the sediment sludge treatment efficiency chemically by adding aluminum sulfate and polyacrylamide （PAM） in the aerated tank of the effluent of Unit A in an adsorption-biodegradation （AB） process of the Liede sewage treatment plant in Guangzhou. The results of our experiments show that the recycled sludge has much higher removing efficiency and sewage-turbidity. To be exact, the efficiency of total phosphorusremoving and turbidity went up to 75.0% and 60.9% respectively at the dosage of aluminum sulfate （calculated by Al2O3 ） and PAM of 15.1 mg/L and 0.05 mg/L. In addition, the removal efficiency of total phosphorus and turbidity can still be made higher on the condition when the aluminum sulfate dosage further increases and falls when the time of recycling increases at the same ratio of sludge to water. Moreover, the removal efficiency of chemical oxygen demand （COD） by the recycled sludge can vary between 23% and 40% and the ammonia won＇ t be removed by the recycled sludge. The sludge volume （SV） and the sludge volume index （SVI） of the active sludge tends to fall but the settleability tends to get improved with the increase of the dosage and the aluminum sulfate and PAM chemically enhanced.
出处
《安全与环境学报》
CAS
CSCD
2008年第4期32-35,共4页
Journal of Safety and Environment
基金
广州市科技局科技攻关计划科技攻关项目(2005Z1-E0061)
关键词
环境工程
AB工艺
化学强化
除磷
污泥沉降性能
environmental engineering
adsorption-biodegradation（AB） process
chemical enhanced
phosphorus re-moval
sludge settleability
