Bioremediation of cadmium-contaminated paddy soil using an autotrophic and heterotrophic mixture. Issue 44 (10th July 2020)

• Record Type: Journal Article
• Authors: Xu, Menglong; Liu, Yazi; Deng, Yan; Zhang, Siyuan; Hao, Xiaodong; Zhu, Ping; Zhou, Jieyi; Yin, Huaqun; Liang, Yili; Liu, Hongwei; Liu, Xueduan; Bai, Lianyang; Jiang, Luhua; Jiang, Huidan
• Is Part Of: RSC advances. Volume 10:Issue 44(2020)
• Page Start: 26090
• Page End: 26101
• Publication Date: 2020-07-10
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra03935g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Bioremediation can be a promising and effective remediation technology for treating Cd contaminated soils. Cooperative bioremediation using heterotrophic and autotrophic mixtures proved to be an efficient, short-term bioremediation strategy for heavy metal contaminated soil. Abstract : Cadmium (Cd) pollution poses a serious risk to human health and ecological security. Bioremediation can be a promising and effective remediation technology for treating Cd contaminated soils. In this study, seven heterotrophic strains were isolated from Cd contaminated soil and 7 autotrophic strains were isolated from acid mine drainage. Cd removal efficiencies were compared after leaching with autotrophic bacteria (Att-sys), heterotrophic isolates (Htt-sys) and cooperative leaching systems (Co-sys) in laboratory agitating reactors. The results indicated that Cd removal efficiency of Co-sys (32.09%) was significantly higher than that of Att-sys (23.24%) and Htt-sys (0.74%). By analyzing the soil microbial community in different bioleaching systems, we found that the addition of heterotrophic isolates significantly promoted the growth of some heavy metal resistant inhabitants ( Massilia, Alicyclobacillus, Micromonospora, etc. ), and Co-sys had a minor effect on the growth of soil indigenous microbes. In Co-sys, the content of the four Cd fractions all decreased compared with other leaching systems. The analysis of soil physicochemical parameters during the leaching process showed that pH and ORP (oxidation reduction potential) were not the only determinants for Cd removal efficiency in Co-sys, synergistic metabolic activities of autotrophic and heterotrophic strains may be other determinants. This study demonstrated that cooperative bioremediation may prove to be a safe and efficient technique for field application in heavy metal soil pollution.