钙镁复配药剂对污水的除磷脱氮作用
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摘要
针对高氮磷含量污水处理,以钙镁合剂利用化学沉淀法对滤液进行除磷脱氮实验。分析钙镁合剂除磷脱氮的机制,考察NaOH投加量和钙镁药剂复配投加量的影响,得到最佳工艺条件。结果表明:实验中NaOH、MgCl_2和CaCl_2的质量浓度分别为150、60和40 mg/L时,污水中总磷(TP)去除率达到90%,总氮(TN)和NH_3-N去除率达到25%;动态小试试验中选取NaOH、MgCl_2和CaCl_2的质量浓度分别为105、48和24 mg/L时,TP去除率达到90%,TN和NH_3-N去除率达到30%;Ca~(2+)和Mg~(2+)在一定条件下与PO~-_4、NH~+_4等基团发生反应,生成磷酸铵镁以及羟基磷酸钙沉淀,从而达到除磷脱氮效果。
Calcium-magnesium mixture agent was used for treating sewage with high nitrogen and phosphorus content, and phosphorus and nitrogen removal experiments were carried out. The mechanism of denitrification and phosphorus removal by calcium and magnesium compound was analyzed. And the dosages of NaOH and calcium and magnesium mixture agent were investigated, through which the optimized conditions were obtained. It is found when the mass concentration of NaOH, MgCl_2 and CaCl_2 is 150 mg/L, 60 mg/L, and 40 mg/L respectively, the removal rate of total phosphorus(TP), total nitrogen TN and NH_3-N reaches 90% and 25% after treatment. In the dynamic test, when the mass concentrations of NaOH, MgCl_2 and CaCl_2 is 105 mg/L and 48 mg/L, and 24 mg/L respectively, the removal rate of TP reaches 90% and the removal rate of TN and NH_3-N is 30%. When Ca~(2+) and Mg~(2+) react with PO~-_4, NH~+_4 and other groups to form magnesium-ammonium-phosphate and hydroxyapatite precipitation, the phosphorus and the nitrogen in the sewage can be removed.
Calcium-magnesium mixture agent was used for treating sewage with high nitrogen and phosphorus content, and phosphorus and nitrogen removal experiments were carried out. The mechanism of denitrification and phosphorus removal by calcium and magnesium compound was analyzed. And the dosages of NaOH and calcium and magnesium mixture agent were investigated, through which the optimized conditions were obtained. It is found when the mass concentration of NaOH, MgCl_2 and CaCl_2 is 150 mg/L, 60 mg/L, and 40 mg/L respectively, the removal rate of total phosphorus(TP), total nitrogen TN and NH_3-N reaches 90% and 25% after treatment. In the dynamic test, when the mass concentrations of NaOH, MgCl_2 and CaCl_2 is 105 mg/L and 48 mg/L, and 24 mg/L respectively, the removal rate of TP reaches 90% and the removal rate of TN and NH_3-N is 30%. When Ca~(2+) and Mg~(2+) react with PO~-_4, NH~+_4 and other groups to form magnesium-ammonium-phosphate and hydroxyapatite precipitation, the phosphorus and the nitrogen in the sewage can be removed.
引文
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[2] 刘军伟,赵秀改.污水处理和再利用是节水的重要途径[J].山西水利,2005,21(4):39-41.LIU Junwei,ZHAO Xiugai.Sewage treatment and reuse is an important way to save water[J].Shanxi Water Resources,2005,21(4):39-41.
[3] YANG Yandong,ZHANG Liang,SHAO Hedong,et al.Enhanced nutrients removal from municipal wastewater through biological phosphorus removal followed by partial nitritation/anammox[J].Frontiers of Environmental Science & Engineering,2017,11(2):109-114.
[4] ZOU Haiming,WANG Yan.Phosphorus removal and recovery from domestic wastewater in a novel process of enhanced biological phosphorus removal coupled with crystallization[J].Bioresource Technology,2016,211:87-92.
[5] ALTMANN J,REHFELD D,TRADER K,et al.Combination of granular activated carbon adsorption and deep-bed filtration as a single advanced wastewater treatment step for organic micropollutant and phosphorus removal[J].Water Research,2016,92:131-139.
[6] 姜翠玉,李亮,祝威,等.Fe3O4水基磁流体的合成及其在油田污水处理中的应用[J].中国石油大学学报(自然科学版),2015,39(4):171-177.JIANG Cuiyu,LI Liang,ZHU Wei,et al.Preparation of water-based Fe3O4 magnetic fluid and its application in oilfield oily sewage treatment[J].Journal of China University of Petroleum(Edition of Natural Science),2015,39(4):171-177.
[7] OSMANLIOGLU A E.Decontamination of radioactive wastewater by two-staged chemical precipitation[J].Nuclear Engineering & Technology,2018,50(6):886-889.
[8] WANG J,SONG Y,YUAN P,et al.Modeling the crystallization of magnesium ammonium phosphate for phosphorus recovery[J].Chemosphere,2006,65(7):1182-1187.
[9] 刘志,邱立平,王嘉斌,等.pH对磷酸铵镁结晶介稳区、诱导期和反应速率的影响[J].环境工程学报,2015,9(1):89-94.LIU Zhi,QIU Liping,WANG Jiabin,et al.Influence of pH on crystallization metastable zone,induction periodand crystallization rate of magnesium ammonium phosphate[J].Chinese Journal of Environmental Engineering,2015,9(1):89-94.
[10] 郝凌云,周荣敏,周芳,等.磷酸铵镁沉淀法回收污水中磷的反应条件优化[J].工业用水与废水,2008,39(1):58-61.HAO Lingyun,ZHOU Rongmin,ZHOU Fang,et al.A reaction condition optimization for phosphorus removal from wastewater by magnesium ammonium phosphate sedimentation[J].Industrial Water & Wastewater,2008,39(1):58-61.
[11] 贾丽艳,孙建业.用磷酸铵镁沉淀法去除沈阳老虎冲垃圾渗滤液中的氨氮[J].环境保护科学,2007,33(6):61-63.JIA Liyan,SUN Jianye.Removal of NH3-N from Laohuchong landfill leachate by magnesium ammonium phosphate precipitation in Shenyang[J].Environmental Protection Science,2007,33(6):61-63.
[12] 张怡.EPRC除磷技术在城市污水处理中的应用研究[D].南京:东南大学,2008.ZHANG Yi.Application research on EPRC phosphorus removal technology in urban wastewater treatment[D].Nanjing:Southeast University,2008.
[13] 王铸,杜兵,刘寅.羟基磷酸钙结晶除磷研究进展[J].环境工程,2015,33(11):16-20.WANG Zhu,DU Bing,LIU Yin.Researchadvances inposphorusremoval by hydroxyapatite crystallization[J].Environmental Engineering,2015,33(11):16-20.
[14] 宋永会,钱锋,向连城.磷酸钙沉淀法去除猪场废水中磷的实验研究[J].环境科学,2011,32(6):1679-1686.SONG Yonghui,QIAN Feng,XIANG Liancheng.Research on phosphorus removal from swine wastewater by precipitation of calcium phosphate[J].Environmental Science,2011,32(6):1679-1686.
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