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(MgxBC),研究了MgxBC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.
A series of Mg modified biochar(MgxBC)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 MgCl_(2) concentration exhibited significant influence on P adsorption.The Mg1BC prepared in N2 atmosphere after being treated with 1mol/L MgCl_(2) could become the best adsorbent.According to the Langmuir equation,the maximum adsorption capacity of Mg_(1)BC for P was 63.2mg/g,about three times the unmodified BC.Under the studied conditions,Mg_(1)BC could remove 99%of P above pH_(0)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.
作者
杨育红
寇丽栋
范庆峰
王静
YANG Yu-hong;KOU Li-dong;FAN Qing-feng;WANG Jing(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;School of Environment,Henan Normal University,Xinxiang 453007,China;Institute of Chemistry,Henan Academy of Sciences,Zhengzhou 450002,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2022年第9期4137-4144,共8页
China Environmental Science
基金
国家自然科学基金资助项目(21976051)。
关键词
镁改性
生物炭
磷酸根
抗生素
吸附
催化降解
Mg modification
biochar
phosphate
antibiotics
adsorption
catalytic degradation
