摘要
以含超高盐度(7%,以NaCl计)、高磷的榨菜废水为研究对象,考察了初始pH值、DO、温度等环境因子对好氧磷酸盐还原系统除磷效能的影响。结果表明,试验过程中维持偏碱性环境(初始pH值为8.0)有利于磷酸盐还原菌发挥酶活性;DO主要通过影响生物膜内微环境的分布来影响磷酸盐的还原,表现为除磷效能随DO浓度的降低而降低。但DO浓度过高会导致生物膜脱落,造成出水COD值升高,DO宜控制在6.0 mg/L。较高的温度有利于磷酸盐还原菌除磷。但过高的温度会使反应器中絮凝性较差的明串珠菌大量繁殖,导致出水浑浊,表现为出水COD值较高。因此,温度应控制在30℃。
The effects of environmental factors such as initial pH value, dissolved oxygen （DO） and temperature on phosphorus removal efficiency by aerobic phosphate reduction were investigated in treatment of hypersaline （salinity of 7% , calculated as NaCl） and high-phosphorus pickled mustard tuber wastewater. The results show that near alkaline condition （ initial pH value of about 8.0） can help phosphate reduction bacteria （PRB） to exert enzyme activity. The impact of DO on phosphate reduction is achieved mainly by affecting the distribution of micro-environment in biofilm, which is characterized by that the phosphorus removal rate is decreased with a fall in DO concentration. However, excessively high DO can lead to detachment of biofilm, thus causing the increase of effluent COD concentration, and so DO should be controlled in the range of 6.0 mg/L. Moreover, a higher temperature is more beneficial to phosphorus removal by PRB. However, excessively high temperature can result in substantial reproduction of Leuconostoc with poor flocculability in reactor, which causes turbid effluent with high COD.Hence, the optimal temperature should be at about 30℃
出处
《中国给水排水》
CAS
CSCD
北大核心
2011年第23期21-25,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2008ZX07315-004)
重庆交通大学引进人才基金资助项目(100867)
关键词
初始PH值
溶解氧
温度
磷酸盐还原
榨菜废水
initial pH value
dissolved oxygen
temperature
phosphate reduction
mustard tuber wastewater
