摘要
以采用化学辅助除磷工艺的5座城市污水处理厂为研究对象,通过考察投加化学药剂后的磷去除特征以及不同形态铁对磷去除的贡献比例,评估药剂对污水处理厂除磷性能的影响。结果显示,在较低的Fe^(3+)投加摩尔当量(0.88)下,微生物具有一定的厌氧释磷能力[0.103 mg/(gMLVSS·h)];但当Fe^(3+)投加摩尔当量达到1.79时,微生物已基本丧失厌氧释磷能力,说明在0.88~1.79的Fe^(3+)投加摩尔当量范围内,微生物厌氧释磷活性随着Fe^(3+)浓度的增加而逐渐降低。Al^(3+)对微生物厌氧释磷具有明显的抑制作用,且此抑制作用随着Al^(3+)投加摩尔当量的增加而增强。此外,污泥中磷和铁的组分分析结果表明,与铁结合的磷是污泥中磷的主要赋存形态;并且,随着Fe^(3+)在系统中不断累积,残存的Fe^(3+)水解形成铁氧化物后会对磷酸盐产生强烈的沉淀吸附作用。总的来说,尽管随着Fe^(3+)浓度的增加,微生物的厌氧释磷能力降低,但磷酸盐在水解铁氧化物上的吸附才是导致污水厂厌氧阶段磷酸盐浓度降低的主要原因。
In five municipal wastewater treatment plants with chemical-aid phosphorus removal,the effects of chemicals on phosphorus removal performance were evaluated by investigating the phosphorus removal behavior and the contribution ratio of different forms of iron to phosphorus removal.At low dosage of Fe^(3+)calculated by molar equivalent(0.88),the microorganisms had a certain anaerobic phosphorus release ability[0.103 mg/(gMLVSS·h)].However,when the molar equivalent of Fe^(3+)dosage was 1.79,the anaerobic phosphorus release ability of the microorganisms was basically lost,indicating that the anaerobic phosphorus release activity decreased gradually with the increase of Fe^(3+)dosage molar equivalent in the range of 0.88-1.79.Al^(3+)had an obvious inhibitory effect on anaerobic phosphorus release,and the inhibitory effect was enhanced with the increase of Al^(3+)dosage molar equivalent.In addition,the analysis results of phosphorus and iron components in sludge showed that phosphorus bounding to iron was the main form of phosphorus in sludge,and the residual Fe3+hydrolyzed to form iron oxides which produced strong precipitation and adsorption on phosphate with the continuous accumulation of Fe3+in the system.In general,although the anaerobic phosphorus release ability decreased with the increase of Fe3+concentration,the adsorption of phosphate on hydrolyzed iron oxide was the main reason for the decrease of phosphate concentration in the anaerobic stage of wastewater treatment plant.
作者
洪毅怡晖
何强
皇甫小留
王辛戈
HONG Yi-yi-hui;HE Qiang;HUANGFU Xiao-liu;WANG Xin-ge(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment<Ministry of Education>,Chongqing University,Chongqing 400044,China;College of Environment and Ecology,Chongqing University,Chongqing 400044,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2023年第9期18-25,共8页
China Water & Wastewater
基金
国家重点研发计划项目(2018YFC1903203)
重庆市技术创新与应用发展专项(cstc2019jscx-tjsbX0002)。
关键词
污水处理厂
化学辅助除磷
厌氧释磷
回流污泥
wastewater treatment plant
chemical-aid phosphorus removal
anaerobic phosphorus release
return sludge
