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| Treatment of Ammonia-nitrogen-bearing Wastewater by Chemical Precipitation and Break Point Chlorination |
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Received:January 17, 2015
Revised:January 21, 2015
Accepted:January 22, 2015
Published Online:June 23, 2015
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| DOI：doi：10.3969/j.issn.1007-7545.2015.07.017 |
| KeyWord:rare earth wastewater, ammonia nitrogen, chemical precipitation, break point chlorination |
| Author | Institution |
| LUOYUZHI |
中国地质科学院矿产综合利用研究所 |
| SHEN MINGWEI |
中国地质科学院矿产综合利用研究所 中国地质调查局金属矿产资源综合利用技术研究中心 |
| LI BO |
东北大学 材料与冶金学院 |
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| Abstract: |
| Ammonia-nitrogen-bearing wastewater from rare earth industry was treated by chemical precipitation and break point chlorination. Chemical precipitation tests results indicate that removal rate of NH4 -N is 90.64% under the conditions of pH=7 and precipitation time of 15 minutes. Break point chlorination tests results indicate that NH4 -N in rare earth wastewater can be reduced to 8.35 mg/L under the conditions of pH=7, 1.4 times of theoretical dosage of sodium hypochlorite solution and reaction time of 15 minutes. The treated wastewater meets the standard of RE industrial wastewater ammonia emissions, and the treating processes are economically feasible. |
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