P-RTC化学除磷智能实时控制系统在污水厂的应用
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摘要
城市污水处理厂若生物除磷效果不佳,则需投加化学药剂辅助除磷。由于目前传统的人工手动加药模式存在诸多弊端,山东省某污水处理厂于2017年对二期生物池加设P-RTC自动加药装置,建立能够协同生物与化学除磷的动态控制系统。将此装置一年的自动运行情况与一期手动加药运行情况对比发现,二期自动加药系统吨水药耗降低约17%,提高了生物除磷效果,同时污泥产量降低了约30%,节省人工成本近3万元/a。分析了P-RTC装置运行的优缺点及注意事项,可为其他污水厂的后期建设提供参考。
Due to the poor biological phosphorus removal effect,the urban sewage treatment plant cannot stably meet the pollutant discharge standards of urban sewage treatment plants,so chemical agents should be added to assist phosphorus removal. The traditional manual dosing mode had many shortcomings. In 2017,a sewage treatment plant in Shandong Province added a P-RTC automatic dosing device to the second-stage biological pool to establish a dynamic control system capable of synergistic biological and chemical phosphorus removal. By comparing the result of one-year automatic operation of this device with the first-stage manual dosing operation, it showed that the chemical consumption per ton of water in the second phase was reduced by about 17%,which improved the biological phosphorus removal effect,simultaneously reduced sludge production by about 30% and saved annual labor cost by nearly 30 000 yuan/a. Advantages and disadvantages of the P-RTC device were discussed. The operation mode was standardized. The research could provide practical reference for the later construction of other plants.
Due to the poor biological phosphorus removal effect,the urban sewage treatment plant cannot stably meet the pollutant discharge standards of urban sewage treatment plants,so chemical agents should be added to assist phosphorus removal. The traditional manual dosing mode had many shortcomings. In 2017,a sewage treatment plant in Shandong Province added a P-RTC automatic dosing device to the second-stage biological pool to establish a dynamic control system capable of synergistic biological and chemical phosphorus removal. By comparing the result of one-year automatic operation of this device with the first-stage manual dosing operation, it showed that the chemical consumption per ton of water in the second phase was reduced by about 17%,which improved the biological phosphorus removal effect,simultaneously reduced sludge production by about 30% and saved annual labor cost by nearly 30 000 yuan/a. Advantages and disadvantages of the P-RTC device were discussed. The operation mode was standardized. The research could provide practical reference for the later construction of other plants.
引文
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[2]Hou J L,Kang Y.Research progress of biological removal of nitrogen and phosphorus in municipal sewage[J].Chem Ind Eng Prog,2007,26(3):366-370.
[3]李炜炜,吴国防,丁云松,等.城市污水厂化学除磷投药点后移的生产性试验[J].中国给水排水,2010,26(10):107-109.Li Weiwei,Wu Guofang,Ding Yunsong,et al.Productive test of chemical phosphorus removal dosing point in urban sewage treatment plant[J].China Water&Wastewater,2010,26(10):107-109(in Chinese).
[4]Liao C M,Feng X D.Nitrogen and phosphorus removal for swine wastewater using intermittent aeration batch reactor followed by ammonium crystallization process[J].Water Res,1995,29(12):2643-2650.
[5]邱维,张智.城市污水化学除磷的探讨[J].重庆环境科学,2002,24(2):81-84.Qiu Wei,Zhang Zhi.Discussion on chemical phosphorus removal from municipal wastewater[J].Chongqing Environmental Science,2002,24(2):81-84(in Chinese).
[6]念东,王佳伟,刘立超,等.城市污水处理厂化学除磷效果及运行成本研究[J].给水排水,2008,34(5):7-10.Nian Dong,Wang Jiawei,Liu Lichao,et al.Study on chemical phosphorus removal efficiency and operation cost in urban sewage treatment plant[J].Water&Wastewater Engineering,2008,34(5):7-10(in Chinese).
[7]邱勇,李冰,施汉昌,等.污水处理厂化学除磷自动控制系统优化研究[J].给水排水,2016,42(7):126-129.Qiu Yong,Li Bing,Shi Hanchang,et al.Optimal control of chemical precipitation of phosphorous in wastewater treatment plants[J].Water&Wastewater Engineering,2016,42(7):126-129(in Chinese).
[8]侯艳玲,刘艳臣,邱勇,等.化学除磷药剂中三价铁铝对生物系统污泥活性影响的研究[J].给水排水,2010,36(6):38-41.Hou Yanling,Liu Yanchen,Qiu Yong,et al.Study on the effect of trivalent iron aluminum on the activity of biological system sludge in chemical phosphorus removal chemicals[J].Water&Wastewater Engineering,2010,36(6):38-41(in Chinese).
[9]Randall A A,Chen Y,Liu Y H,et al.Polyhydroxyalkanoate form and polyphosphate regulation:Keys to biological phosphorus and glycogen transformations?[J].Water Sci Technol,2003,47(11):227-233.