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Purification and water resource circulation utilization of Cd-containing wastewater during microbial remediation of Cd-polluted soil

文献类型： 外文期刊

作者： Deng, Yan 1 ; Fu, Shaodong 2 ; Xu, Menglong 2 ; Liu, Hongwei 2 ; Jiang, Luhua 2 ; Liu, Xueduan 2 ; Jiang, Huidan 1 ;

作者机构： 1.Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Changsha 410125, Peoples R China

2.Cent South Univ, Sch Minerals Proc & Bioengn, Key Lab Biomet, Minist Educ, Changsha 410083, Peoples R China

关键词： Cd-containing wastewater; Water recycling; Adsorption material; Purification; Microbial remediation

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.3； 五年影响因子：8.2 ）

ISSN： 0013-9351

年卷期： 2023 年 219 卷

页码：

收录情况： SCI

摘要： The purification and water resource circulation utilization of cadmium-containing leachate is a key link in the field application of microbial remediation in Cd-polluted soil. In this study, through a simulation experiment of microbial remediation of Cd-polluted paddy soil, the feasibility of the purification and recycling process of wastewater derived from microbial remediation of Cd-polluted soil was explored. The results of the microbial mobilization and removal experiment showed that the concentrations of Cd, N, P, and K in the leachate were 88.51 mu g/L, 38.06, 0.53, and 98.87 mg/L, respectively. The leachate also contained a large number of microbial resources, indicating that it had high recovery values. To recycle this wastewater, activated carbon (C), humic acid (H), and self-assembled monolayers on mesoporous supports (SAMMS; S) were used as adsorbents. The results showed that the co-existing cations in the leachate had a major influence on the adsorption of Cd. In the ternary system of Fe, Al, and Cd, the removal efficiency of Cd increased to 91.2% when the S dosage was increased to 5 parts per thousand, and the sorption of Cd occurred after Fe and Al. However, C and H exhibited poor adsorption performances. The isotherm models further showed that the maximum adsorption capacities of S, H, and C were 13.96, 6.41 and 2.94 mg/g, respectively. The adsorption kinetics of S showed that adsorption was a rapid process, and the C-H and O-Si-O of S were the key functional groups. The pH of the leachate significantly affected the adsorption efficiency of Cd. Finally, the purified leachate was successfully applied to microbial cultivation and soil remediation. Overall, the reclamation of Cd-containing wastewater can not only dampen the impacts of water shortages, but also achieve the purposes of Cd removal and resource recovery to lower costs by approximately 1166-3499 yuan per mu.

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