镁改性污泥基生物炭去除水中磷和抗生素

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摘要为解决废水磷回收和污泥资源化利用问题,以污水处理厂污泥为前驱体,采用镁盐溶液浸渍和高温热解方法,制备系列镁改性污泥基生物炭(Mg_xBC),研究了Mg_xBC对水中磷酸盐的吸附性能,以及在过一硫酸氢钾复合盐(PMS)氧化剂存在下对共存抗生素的催化降解性能.结果显示:氮气氛、1mol/L镁盐加入量制备的Mg₁BC相比于未改性污泥基生物炭(BC),对磷的Langmuir饱和吸附容量可达63.2mg/g(为BC的近3倍);除极酸条件下(pH₀<4),Mg₁BC的磷去除率均大于99%;水中共存离子对Mg₁BC吸附磷影响较小,Mg₁BC具有较强的适用性.此外,Mg₁BC可催化活化PMS,显著提高与磷共存抗生素(如四环素(TC)、磺胺二甲基嘧啶(SMT))的降解性能,实现吸附磷和高效去除抗生素的双重目的.

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	杨育红
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关键词 ：镁改性, 生物炭, 磷酸根, 抗生素, 吸附, 催化降解

Abstract：A series of Mg modified biochar (Mg_xBC) were prepared from calcination of municipal waste sludge after being impregnated with MgCl₂ to serve as the adsorbent for P recovery and as the catalyst for peroxymonosulfate (PMS) activation and antibiotic degradation. Results showed that calcination atmosphere (i.e., air-deficient, N₂, vacuum) and MgCl₂ concentration exhibited significant influence on P adsorption. The Mg₁BC prepared in N₂ atmosphere after being treated with 1mol/L MgCl₂ could become the best adsorbent. According to the Langmuir equation, the maximum adsorption capacity of Mg₁BC for P was 63.2mg/g, about three times the unmodified BC. Under the studied conditions, Mg₁BC could remove 99% of P above pH₀ 4, and all of the common water co-existing constituents showed no substantial influence on P adsorption, indicating that Mg₁BC is applicable for practical wastewater treatment. Besides, Mg₁BC could also activate PMS and enhance the degradation of the co-existing antibiotics like TC and SMT.

Key words： Mg modification biochar phosphate antibiotics adsorption catalytic degradation

收稿日期: 2022-01-16

PACS:

X703.1

基金资助:国家自然科学基金资助项目(21976051)

通讯作者: 王静,研究员,wangj12@163.com E-mail: wangj12@163.com

作者简介: 杨育红(1971-),女,河南焦作人,讲师,博士,主要从事固体废物资源化利用与水污染防治研究.发表论文30余篇.

引用本文:

杨育红, 寇丽栋, 范庆峰, 王静. 镁改性污泥基生物炭去除水中磷和抗生素[J]. 中国环境科学, 2022, 42(9): 4137-4144. YANG Yu-hong, KOU Li-dong, FAN Qing-feng, WANG Jing. Removal of phosphate and antibiotics by magnesium modified sludge - derived biochar. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4137-4144.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I9/4137

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