[1]王湘徽,陈旭东,康静,等.颗粒鸟粪石煅烧热分解及产物对污水脱氮效果研究[J].中国给水排水,2023,39(15):8-14.
　WANG Xiang-hui,CHENXu-dong,KANGJing,et al.Calcination and Thermal Decomposition of Pellet Struvite and Effect of Its Product on Ammonia Removal from Wastewater[J].China Water & Wastewater,2023,39(15):8-14.
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颗粒鸟粪石煅烧热分解及产物对污水脱氮效果研究

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第15期 页码: 8-14 栏目: 出版日期: 2023-08-01
Title:
Calcination and Thermal Decomposition of Pellet Struvite and Effect of Its Product on Ammonia Removal from Wastewater
作者:
王湘徽1，2， 陈旭东1， 康静1， 陆茵3， 郑敏4， 汪诚文5， 徐康宁1
（1.北京林业大学环境科学与工程学院 水体污染源控制技术北京市重点实验室，北京 100083；2.上海康恒环境修复有限公司，上海 201703；3.北京国环清华环境工程设计研究院有限公司，北京 100084；4.昆士兰大学 水管理高等研究中心，澳大利亚；5.清华大学 环境学院，北京 100084）
Author(s):
WANG Xiang-hui1，2， CHEN　Xu-dong1， KANG　Jing1， LU　Yin3， ZHENG　Min4， WANG　Cheng-wen5， XU　Kang-ning1
（1. Beijing Key Laboratory for Source Control Technology of Water Pollution， College of Environmental Science & Engineering， Beijing Forestry University， Beijing 100083， China； 2. Shanghai SUS Environment Co. Ltd.， Shanghai 201703， China； 3. Beijing Guohuan Tsinghua Environmental Engineering Design & Research Institute Co. Ltd.， Beijing 100084， China； 4. Advanced Water Management Centre， The University of Queensland， Australia； 5. School of Environment， Tsinghua University， Beijing 100084， China）
关键词:
鸟粪石;  煅烧热分解;  氨氮回收;  脱氮
Keywords:
struvite;  calcination and thermal decomposition;  ammonia nitrogen recovery;  nitrogen removal
摘要:
针对传统鸟粪石沉淀法回收氨氮时药剂投加量大、成本高且沉淀产物固液分离困难的问题，研究了颗粒鸟粪石（粒径为2~2.36 mm）的煅烧热分解条件优化，并探讨了热分解产物对含氨氮污水的脱氮效果及作用机制。结果表明，增加煅烧温度、升温速率和恒温时间都有助于颗粒鸟粪石的热分解，但会导致无效磷含量增加和颗粒强度下降。煅烧热分解的最优条件：煅烧温度为150 ℃、升温速率为15 ℃/min、恒温时间为2 h，此时热分解的颗粒产率为58%、氨释放率为66%、无效磷含量为9.6%、颗粒强度为1.8 N。P/N（物质的量之比）和污水初始pH是影响热分解产物去除氨氮的主要因素，最佳P/N=3.5、pH=8.0，此时氨氮去除率约为72%。晶体性质分析结果表明，颗粒鸟粪石煅烧释放NH3后形成的MgHPO4通过再次形成鸟粪石沉淀能够有效去除污水中的氨氮。
Abstract:
This paper investigated the optimization of calcination and thermal decomposition conditions of pellet struvite with sizes of 2-2.36 mm, explored the effect of thermal decomposition products on nitrogen removal efficiency of wastewater containing ammonia nitrogen, and discussed the mechanism, so as to solve the problems of large dosage, high cost and difficulty in precipitate-liquid separation of the traditional struvite precipitation process for ammonia nitrogen recovery. Increasing calcination temperature, heating rate and constant temperature time all contributed to the thermal decomposition of pellet struvite, but led to the increase of unavailable phosphorus content and the decrease of particle strength. The optimal conditions of calcination and thermal decomposition were as follows: the calcination temperature was 150 ℃, the heating rate was 15 ℃/min, and the constant temperature time was 2 h. Under this condition, the particle yield of thermal decomposition products was 58%, the ammonia release rate was 66%, the unavailable phosphorus content was 9.6%, and the particle strength was 1.8 N. The molar ratio of P to N and the initial pH of wastewater were the main factors affecting the calcination and thermal decomposition products for ammonia nitrogen removal, the optimal conditions were P to N molar ratio of 3.5 and initial pH of 8.0, and the removal rate of ammonia nitrogen was approximately 72%. The analysis of crystal properties showed that the MgHPO4 formed after the release of NH3 in calcination of pellet struvite effectively removed ammonia nitrogen from wastewater by forming struvite precipitation again.
更新日期/Last Update: 2023-08-01