| 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、MgCl2和CaCl2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NH3-N去除率达到25％;动态小试试验中选取NaOH、MgCl2和CaCl2的质量浓度分别为105、48和24 mg/L时,TP去除率达到90％,TN和NH3-N去除率达到30％;Ca2+和Mg2+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。 |
| 关键词: 污水处理 钙镁复合 除磷脱氮 |
| DOI：10.3969/j.issn.1673-5005.2019.02.020 |
| 分类号::X 703 |
| 文献标识码:A |
| 基金项目:山东省自然科学基金项目(ZR2017MB015)；重质油国家重点实验室项目(SLKZZ-2017002)；中国石油科技创新基金项目(2017D-5007-0601) |
|
| Removal of phosphorus and nitrogen from sewage by calcium and magnesium compounding agent |
|
GU Xuelin1, LIU Hongli2, LIU Yutong3, ZHANG Xiaomin1, CHEN Shuang3
|
|
(1.Shandong Shengli Water Affairs Company Limited, Dongying 257000, China;2.Qingdao West Coast New Area Experimental High School, Qingdao 266400, China;3.College of Chemical Engineering in China University of Petroleum(East China), Qingdao 266580, China)
|
| Abstract: |
| 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, MgCl2 and CaCl2 is 150 mg/L, 60 mg/L, and 40 mg/L respectively, the removal rate of total phosphorus (TP), total nitrogen TN and NH3-N reaches 90％ and 25％ after treatment. In the dynamic test, when the mass concentrations of NaOH, MgCl2 and CaCl2 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 NH3-N is 30％. When Ca2+ and Mg2+ 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. |
| Key words: sewage disposal calcium and magnesium compound phosphorus and nitrogen removal |
