Red mud-modified biochar reduces soil arsenic availability and changes bacterial composition
Worldwide arsenic (As) contamination in soils induces pollution of surface and ground waters, reduces crop quality and yield, and threatens human health. Biochar-based material has been proposed as ameliorants for contaminated soils. Here soil incubations were conducted to investigate the effects of biochar, red mud and red mud-modified biochar on the pH, total organic carbon content, sodium bicarbonate (NaHCO3)-extractable As concentration and microbial community composition of As-contaminated soils. Results show red mud-modified biochar reduces the concentration of NaHCO3-extractable As by 27%, whereas this concentration increases by 23% using biochar alone and 6% using red mud alone. Similar trends are observed for HCl-extractable As. The red mud and red mud-modified biochar treatments increased the relative abundance of Proteobacteria and its affiliated genera, such as Kaistobacter, Rhodanobacter and Rhodoplanes.
KeywordsArsenic Biochar Iron Microbial community Red mud Soil
Financial supports from National Natural Science Foundation of China (No. 41771512), the Research Grants Council of the Hong Kong Special Administrative Region, China (No. 28100014), the Fundamental Research Funds for the Central Universities of Central South University (No. 2017zzts598) and the open fund for valuable instruments and equipment of Central South University (No. CSUZC201712) are gratefully acknowledged. Chuan Wu acknowledged the Croucher Chinese Visitorships 2017/2018 of Hong Kong.
- Ahmad M, Lee SS, Lim JE, Lee SE, Cho JS, Moon DH et al (2014) Speciation and phytoavailability of lead and antimony in a small arms range soil amended with mussel shell, cow bone and biochar: EXAFS spectroscopy and chemical extractions. Chemosphere 95:433–441. https://doi.org/10.1016/j.chemosphere.2013.09.077 CrossRefGoogle Scholar
- Beesley L, Marmiroli M, Pagano L, Pigoni V, Fellet G, Fresno T et al (2013) Biochar addition to an arsenic contaminated soil increases arsenic concentrations in the pore water but reduces uptake to tomato plants (Solanumlycopersicum L.). Sci Total Environ 454–455:598–603. https://doi.org/10.1016/j.scitotenv.2013.02.047 CrossRefGoogle Scholar
- Chen Z, Wang YP, Xia D, Jiang XL, Fu D, Shen L et al (2016) Enhanced bioreduction of iron and arsenic in sediment by biochar amendment influencing microbial community composition and dissolved organic matter content and composition. J Hazard Mater 311:20–29. https://doi.org/10.1016/j.jhazmat.2016.02.069 CrossRefGoogle Scholar
- Lovley DR, Phillips EJ (1986) Availability of ferric iron for microbial reduction in bottom sediments of the freshwater tidal. Appl Environ Microbiol 52:751–757Google Scholar
- WHO (2011) Guidelines for drinking-water quality, vol 4. World Health Organisation, Geneva, pp 315–318Google Scholar
- Xue Y, Gao B, Yao Y, Inyang M, Zhang M, Zimmerman AR et al (2012) Hydrogen peroxide modification enhances the ability of biochar (hydrochar) produced from hydrothermal carbonization of peanut hull to remove aqueous heavy metals: batch and column tests. Chem Eng J 200–202:673–680. https://doi.org/10.1016/j.cej.2012.06.116 CrossRefGoogle Scholar
- Zhu F, Liao JX, Xue SG, Hartley W, Zou Q, Wu H (2016a) Evaluation of aggregate microstructures following natural regeneration in bauxite residue as characterized by synchrotron-based X-ray micro-computed tomography. Sci Total Environ 573:155–163. https://doi.org/10.1016/j.scitotenv.2016.08.108 CrossRefGoogle Scholar