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

Yan Deng; Shaodong Fu; Menglong Xu; Hongwei Liu; Luhua Jiang; Xueduan Liu; Huidan Jiang

doi:10.1016/j.envres.2022.115036

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

Environ Res. 2023 Feb 15:219:115036. doi: 10.1016/j.envres.2022.115036. Epub 2022 Dec 9.

Authors

Yan Deng¹, Shaodong Fu², Menglong Xu², Hongwei Liu², Luhua Jiang², Xueduan Liu², Huidan Jiang³

Affiliations

¹ Hunan Agricultural Biotechnology Research Institute, Hunan Academy of Agricultural Sciences, Changsha, 410125, China; School of Minerals Processing and Bioengineering, Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China. Electronic address: dengyan202103@163.com.
² School of Minerals Processing and Bioengineering, Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, 410083, China.
³ Hunan Agricultural Biotechnology Research Institute, Hunan Academy of Agricultural Sciences, Changsha, 410125, China. Electronic address: jianghuidan@hunaas.cn.

PMID: 36502910
DOI: 10.1016/j.envres.2022.115036

Abstract

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 μg/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‰, 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.

Keywords: Adsorption material; Cd-containing wastewater; Microbial remediation; Purification; Water recycling.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Cadmium / analysis
Environmental Restoration and Remediation*
Soil
Soil Pollutants* / analysis
Wastewater
Water Pollutants, Chemical*
Water Purification* / methods
Water Resources

Substances

Cadmium
Wastewater
Soil Pollutants
Soil
Water Pollutants, Chemical