MB(A2/O)处理城市污水富磷上清液的化学除磷研究
Chemical phosphorus removal for anaerobic rich phosphate supernatant of municipal sewage treated by MB (A2/O) reactor
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摘要: 为开发新型除磷脱氮工艺，研制了将MBR和A2/O工艺相结合的新型MB(A2/O)反应器。研究了MB(A2/O)反应器处理城市污水厌氧富磷上清液的化学除磷，并分析了过程机理及特性。结果表明：对于TP在30～45 mg/L的富磷上清液，采用含20% Ca(OH)2的工业石灰与P的最佳投加质量比为22.5；纯Ca(OH)2与P的最佳投加质量比为5.6（摩尔比为2.5）；FeSO4·7H2O与P的最佳投加质量比为10.7（Fe2＋与P的摩尔比为1.3）；Al2(SO4)3·12H2O与P的最佳投加质量比为12（Al3＋与P的摩尔比为1.3）时，均可使出水TP稳定在0.3 mg/L以下；以石灰、NaOH的联合投加方式可大幅减少石灰投加量。
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关键词:
- MB(A2/O)反应器 /
- 化学除磷 /
- 聚磷菌
Abstract: MB(A2/O) reactor combined by membrane bioreactor and A2/O craft is developed to promote the craft for phosphorus and nitrogen removal.The chemical phosphorus removal for anaerobic rich phosphate supernatant of municipal sewage treated by MB(A2/O) reactor was studied; and its mechanism and character of the process were analyzed.The results indicate that for the rich phosphate supernatant with ρ(TP) between 30 to 45 mg/L, the best mass ratio of industrial calcareousness with 20% Ca(OH)2 to P is 22.5; the best mass ratio of pure Ca(OH)2 to P is 5.6(the mol ratio of Ca2＋ to P is 2.5); the best mass ratio of FeSO4·7H2O to P is 10.7(the mol ratio of Fe2＋ to P is 1.3); the best mass ratio of Al2(SO4)3·12H2O to P is 12(the mol ratio of Al3＋ to P is 1.3). With the conditions mentioned, the effluent ρ(TP) is lower than 0.3 mg/L steadily, and the feeding of calcareousness and NaOH at the same time can dramatically reduce the feeding amount of calcareousness. -
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