Recovery of nitrogen and phosphorus in wastewater by red mud-modified biochar and its potential application

生物炭 磷酸盐 吸附 废水 化学 稻草 氮气 核化学 无机化学 制浆造纸工业 环境工程 有机化学 热解 环境科学 工程类
作者
Zhipeng Zhao,Bing Wang,Qianwei Feng,Miao Chen,Xueyang Zhang,Ruohan Zhao
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:860: 160289-160289 被引量:76
标识
DOI:10.1016/j.scitotenv.2022.160289
摘要

A large amount of wastewater containing nitrogen, phosphorus, and fluorine produces in the production of phosphate fertilizer. In this study, to simultaneously recover nitrogen and phosphorus from phosphorus-containing wastewater and realize the resource utilization of red mud and rape straw, red mud-modified rape straw biochar (RM/RSBC) was prepared by facile one step, and the physicochemical properties were characterized by Zeta potential, SEM-EDS, BET specific surface area (SSA), FTIR, XRD, and XPS. The adsorption performance and mechanisms of ammonium and phosphate onto RM/RSBC were explored through static, fixed-bed column adsorption, and practical wastewater experiments. The results showed that pH = 3.0 and 8.0 were favorable for the removal of phosphate and ammonium, respectively. The main adsorption mechanisms of ammonium and phosphate were the interaction between ammonium and surface functional groups and surface precipitation, respectively. The removal efficiencies of ammonium and phosphate by fixed-bed column adsorption mainly depended on the addition amount of RM/RSBC, the concentration of ammonium and phosphate, and the flow rate. The results of the germination experiment showed that adding > 0.5 wt% of RM/RSBC loaded with ammonium and phosphate promoted the growth of mung beans. This study shows that RM/RSBC can not only recover ammonium and phosphate in wastewater, but also realize the resource utilization of red mud and rape straw.
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