Chunyangzi Jiang, Liang Hu, Ni He, Yayuan Liu, Hongbo Zhao
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引用次数: 0
Abstract
Microbially induced carbonate precipitation (MICP) provides a novel idea to solve the problem of reduction and stabilization of Cr(VI) in contaminated soil. In this study, the remediation of Cr(VI) in severely polluted soil (total Cr = 5530.00 ± 120.21 mg/kg) by MICP technology combined with the Cr(VI)-reducing bacterium Sporosarcina saromensis W5 was systematically investigated. The results indicated that in W5 and CaCl2 treatment after 35 d of remediation, the Cr in exchangeable fraction could be converted into the oxidizable fraction (F3) and the proportion was 41.49%. Compared to original Cr(VI)-contaminated soil, the content of organic matter and soil urease were enhanced after remediation, indicating the improvement of soil quality. The increase in pH also facilitated the formation and stabilization of carbonate precipitation. In addition, the characterization results showed that Cr(VI) in soil was first reduced to Cr(III), and then formed Ca10Cr6O24(CO3) coprecipitation with CaCO3. The stabilization mechanism of Cr(VI) contained bioreduction, adsorption/complexation, and coprecipitation. The results of this study proposed an efficient and reliable strategy of Cr(VI)-reducing bacterium combined with MICP technology to reduce and stabilize Cr(VI) in high concentration Cr(VI) contaminated soil.
期刊介绍：
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation.
Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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