Effects of red mud on compost maturity and Cd resistance control of rice
ZHOU Hong-yan1, CHEN Zhe1,2, LI Kan-qi1, LENG Wei-gui3, WANG Zong-kang3
1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China; 2. Key Laboratory of Ecology and Environmental Protection of Rare and Endangered Plants, Ministry of Education, Guangxi Normal University, Guilin 541004, China; 3. Guigang Patan Ecology Co., LTD., Guigang 537000, China
Abstract：Red mud was used as an additive to conduct aerobic composting experiments of chicken manure for evaluating effects of red mud on temperature, pH, electrical conductivity (EC), and seed germination index (GI) during composting. The evolution characteristics of humic acid (HA) components during composting were analyzed by combining three-dimensional fluorescence with ultraviolet-visible light spectrum; and the pot experiments were also conducted to explore the barrier effect of compost products on rice cadmium in the mining soil. The results showed that red mud increased the temperature of the compost during the high temperature period. The EC of both groups decreased significantly after composting, however, the EC of red mud compost (4.29mS/cm) was much higher than that of chicken manure compost (3.59mS/cm).The GI of chicken manure compost and red mud compost increased with composting time by; 100.2% and 96.44%, respectively, at the end of composting, indicating that the products of neither red mud compost nor chicken manure compost exhibited phytotoxicity. The protein-like substances in the HA of the two kinds of composts were converted into relatively stable humus-like substances throughout the composting process. A significant increase in SUVA254, SUVA280, and A226-400 of HA indicates the elevated humification degree of compost. In addition, red mud could optimize the humification parameters, implying that the addition of red mud can accelerate the humification process of the heap. In pot experiments, both chicken manure compost and red mud compost increased soil pH and reduced the concentration of DTPA-Cd in soil and total Cd in brown rice. After applying 2g/kg red mud compost, the Cd content in brown rice decreased significantly (by 58.68%) from 0.42mg/kg to 0.17mg/kg after composting. Therefore, red mud can accelerate the composting efficiency to a certain extent. The application of compost products can inhibit the bioavailability of Cd in both soil and rice plants, and an addition of red mud can lead to a higher composting efficiency.
周红燕, 陈喆, 李侃麒, 冷为贵, 王宗抗. 赤泥对堆肥腐熟度及其产品对稻米Cd阻控效果[J]. 中国环境科学, 2022, 42(8): 3812-3821.
ZHOU Hong-yan, CHEN Zhe, LI Kan-qi, LENG Wei-gui, WANG Zong-kang. Effects of red mud on compost maturity and Cd resistance control of rice. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3812-3821.
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