[1]韦传旭,孙可纯,程雪剑,等.磷酸铵镁结晶法回收村镇垃圾中转站渗滤液氨氮[J].中国给水排水,2023,39(23):8-14.
　WEIChuan-xu,SUNKe-chun,CHENGXue-jian,et al.Nitrogen Recovery in Rural Waste Transfer Station Leachate by Magnesium Ammonium Phosphate Crystallization Process[J].China Water & Wastewater,2023,39(23):8-14.
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磷酸铵镁结晶法回收村镇垃圾中转站渗滤液氨氮

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第23期 页码: 8-14 栏目: 出版日期: 2023-12-01
Title:
Nitrogen Recovery in Rural Waste Transfer Station Leachate by Magnesium Ammonium Phosphate Crystallization Process
作者:
韦传旭1， 孙可纯1， 程雪剑1， 苏良湖2， 谈超群1
（1.东南大学 土木工程学院，江苏 南京 210096；2.生态环境部 南京环境科学研究所，江苏 南京 210042）
Author(s):
WEI　Chuan-xu1， SUN　Ke-chun1， CHENG　Xue-jian1， SU　Liang-hu2， TAN　Chao-qun1
（1. School of Civil Engineering， Southeast University， Nanjing 210096， China； 2. Nanjing Institute of Environmental Sciences， Ministry of Ecology and Environment， Nanjing 210042， China）
关键词:
磷酸铵镁;  村镇垃圾中转站;  渗滤液;  氨氮回收率
Keywords:
magnesium ammonium phosphate;  rural waste transfer station;  leachate;  nitrogen recovery
摘要:
采用磷酸铵镁（MAP）结晶法对村镇垃圾中转站渗滤液中的氨氮进行资源化处理和回收。先通过小试探究pH、镁氮比（物质的量之比）和搅拌强度（GT值）对氨氮回收率的影响，再通过中试考察氨氮负荷和运行模式对氨氮回收率的影响，同时对结晶产物进行了表征、毒性和经济性分析。小试结果表明，在pH为10.0、镁氮比为1.2、GT值为20×104的最佳工况下，氨氮最大回收率为72.8%。中试结果表明，高氨氮负荷有利于提升氨氮的回收率，且在氨氮负荷为600 mg/L时获得了74.8%的最大回收率；在连续和间歇模式下，中试对氨氮的最佳回收率都能稳定高于60%。回收上清液出水为低生物毒性，结晶产物（主要是MAP）对黄瓜种子等基本无毒性。经济性分析表明，通过结晶反应合成MAP制备农业缓释肥是可行的。
Abstract:
The nitrogen in rural waste transfer station leachate was treated and recovered by the crystallization method of magnesium ammonium phosphate. The effects of pH, magnesium-nitrogen molar ratio, and stirring intensity on the recovery rate of nitrogen were investigated through small-scale experiments. And the effects of ammonia nitrogen load and operation mode on the recovery rate of ammonia nitrogen were explored through the pilot experiment. The characterization, toxicity analysis and economic analysis of the precipitated product were carried out. The experimental results showed that the max recovery rate of nitrogen was 72.8% under the optimum conditions with pH of 10.0, molar ratio of magnesium to nitrogen of 1.2 and GT value of 20×104. The pilot test results showed that high ammonia nitrogen loading was conducive to improving the recovery rate of ammonia nitrogen, and the maximum recovery rate was 74.8% at ammonia nitrogen loading of 600 mg/L. In both continuous and sequencing batch modes, the best recovery rate of nitrogen in the pilot-scale reaction could be stably higher than 60%. Toxicity analysis showed that the effluent from the supernatant had low biological toxicity, and the precipitated products (mainly MAP) were basically non-toxic to some plant seeds like cucumber seeds. Economic analysis showed that it was feasible to prepare agricultural slow-release fertilizer by synthesizing MAP through crystallization reaction.
更新日期/Last Update: 2023-12-01