Effects of Fe-Mn modified biochar composite treatment on the properties of As-polluted paddy soil

• Published in: Environmental pollution (1987) Vol. 244; pp. 600 - 607
• Main Authors: Lin, Lina, Li, Zhongyang, Liu, Xuewei, Qiu, Weiwen, Song, Zhengguo
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2019
• Subjects: Arsenic; Arsenic - analysis; Bacteroidetes - growth & development; Charcoal - chemistry; Environmental Pollution - analysis; Fe-Mn modified biochar composite; Firmicutes - growth & development; Iron - chemistry; Manganese - chemistry; Organic Chemicals - metabolism; Oryza - growth & development; Oryza - metabolism; Oxidation-Reduction; Oxides - chemistry; Proteobacteria - growth & development; Soil - chemistry; Soil bacteria; Soil enzymes; Soil Microbiology; Soil Pollutants - analysis; Soil Pollutants - metabolism; Soil enzymes; Arsenic; Soil bacteria; Fe-Mn modified biochar composite
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2018.10.011

This study aimed to determine the effects of FeMn modified biochar composite (FMBC) treatment on the pH, redox properties, enzyme activities, and bacterial communities of As-polluted paddy soil. The two utilized FMBCs (FMBC1 and FMBC2) exhibited markedly different effects on soil pH, and treatment with biochar (BC) or FMBCs increased the soil redox potential and reduced the content of available As, facilitating the conversion of originally present non-specifically sorbed and specifically bound As forms to residual, amorphous hydrous oxide–bound, and crystalline hydrous oxide–bound ones. In general, the activities of soil enzymes increased after the above treatments, with the exception of that of alkaline phosphatase, which decreased upon supplementation with FMBC2. Supplementation with BC or FMBCs increased the abundance of Proteobacteria and Firmicutes, decreasing that of Bacteroidetes. Notably, FMBC1 and FMBC2 affected soil properties in different ways, although the mechanisms of the corresponding influence were similar. Thus, treatment with BC-based materials changed the distribution of As and the activities of soil enzymes, additionally affecting a variety of other physicochemical soil properties to make it suitable for microbial growth. [Display omitted] •Added FMBCs could increase the soil redox potential and reduce the content of available As.•FMBCs could be facilitated the conversion of non-specifically sorbed As in paddy soil.•The addition of FMBCs increased the activity of soil enzymes.•Supplementation with FMBCs increased the abundance of Proteobacteria and Firmicutes. Applied BC-based materials could change the As distribution and partial properties of soil to make it suitable for microbial growth.