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山东大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (2): 82-88.doi: 10.6040/j.issn.1672-3961.0.2014.299

• 化学与环境 • 上一篇    下一篇

铁强化微生物除磷的效能及机理

孙翠平, 周维芝, 赵海霞   

  1. 山东大学环境科学与工程学院, 山东 济南 250100
  • 收稿日期:2014-10-27 修回日期:2015-03-18 出版日期:2015-04-20 发布日期:2014-10-27
  • 通讯作者: 周维芝(1970-),女,山东烟台人,教授,博导,博士,主要研究方向为水污染控制.E-mail:wzzhou@sdu.edu.cn E-mail:wzzhou@sdu.edu.cn
  • 作者简介:孙翠平(1990-),女,山东泰安人,硕士研究生,主要研究方向为水污染控制.E-mail:1012044319@qq.com
  • 基金资助:
    国家自然科学基金资助项目(51178255, 41446006);山东省科学技术开发资助项目(2013GHY11511);山东大学基础研究基金资助项目(2014JC035)

Efficiency and mechanism of ferric salt enhanced biological phosphorus removal

SUN Cuiping, ZHOU Weizhi, ZHAO Haixia   

  1. School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, China
  • Received:2014-10-27 Revised:2015-03-18 Online:2015-04-20 Published:2014-10-27

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摘要： 从深海菌中筛选出一株高效除磷菌,并研究了铁强化此除磷菌在高盐合成废水中的除磷效能及机理。通过批次试验研究了铁磷物质的量比、初始pH值对除磷效率的影响以及铁强化生物除磷的动力学,并利用扫描电镜和能谱分析对微生物表面形貌进行了研究。结果表明,与单独铁盐和生物除磷相比,铁强化微生物除磷效率更高效且稳定在95%以上。当n(Fe(III)):n(P)=1:1时,铁强化微生物除磷的最大效率达98.50%,相比单纯生物除磷提高30%,而单独铁盐除磷n(Fe(III)):n(P)=2:1～3:1时,除磷率仅90%;当n(Fe(III)):n(P)≤1:1时,铁强化微生物除磷以微生物除磷为主,铁盐辅助,处理后水pH中性且稳定;当物质的量比n(Fe(III)):n(P)>1:1时,由于Fe(III)水解造成pH降低至5.50以下,微生物生长受抑,磷的去除主要靠化学沉淀。废水初始pH在6.0～9.0范围内,铁强化生物除磷去除率均在95%以上。准一级动力学模型能够很好地模拟生物除磷过程;准二级动力学模型能够很好地模拟铁强化生物除磷,且较长时间内无磷释放现象。铁强化生物除磷的机理包括:(1)细菌生长除磷以及胞外聚合物对磷的吸附;(2)在混合液中形成了羟基磷酸铁络合物;(3)在细菌表面形成了由细菌诱导的铁磷微沉淀。

关键词: 化学除磷, 高盐含磷废水, 污水处理, 动力学, 强化生物除磷, Fe(III)

Abstract: An efficient phosphorus (P) removal bacterium strain was screened from deep-sea bacteria, and phosphorus removal efficiency and mechanism by iron enhanced biological treatment were studied in the high salinity synthetic wastewater. The effects of molar ratio Fe(III)/P, initial pH on phosphorus removal and kinetics of iron enhanced biological phosphorus removal were investigated by batch tests, and the surface morphology of bacteria was studied by SEM-EDS (scanning electron microscopy-energy dispersive X-ray spectroscopy). Results showed that the phosphorus removal efficiency of iron enhanced biological treatment was high and stable at more than 95% compared to those of independent iron and biological treatment. Removal efficiency of phosphorus reached the maximum of 98.5% with molar ratio of Fe(III) and P being 1, which increased 30% than that of the biological treatment, whereas the maximum phosphorus removal was 90% with molar ratio of Fe(III) and P ranging from 2 to 3 by independent iron treatment. Phosphorus removal was mainly ascribed to bacterial growth and aided by iron, and pH was kept stable at about 7.2 when molar ratio of Fe(III) and P being not more than 1. Phosphorus removal was mainly by chemical precipitation with molar ratio of Fe(III) and P being more than 1 because that the pH reduced to 5.5 or even lower by Fe(III) hydrolysis and significantly influenced bacterial growth. Phosphorus removal was kept at above 95% at pH of 6～9 with molar ratio ofFe(III) and P being 1. The dynamic pseudo-first-order model could fit the biological phosphorus removal process well, and the pseudo-second-order model could well describe the iron enhanced biological phosphorus removal without phosphorus releasing for a long time. Except the uptake of part of the phosphorus by bacterial growth and bio-sorption by extracellular polymeric substance, the hydroxyl phosphate iron complex compound and iron phosphorus precipitation induced by bacterium also contributed to the phosphorus removal.

Key words: Fe(III), wastewater treatment, enhanced biological phosphorus removal, chemical phosphorus removal, high salinity wastewater containing phosphorus, kinetics

中图分类号: 

  • X52
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