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EFFECT OF PYROLYSIS TEMPERATURE ON BIOCHAR ENHANCED TREATMENT OF CADMIUM CONTAMINATED SOIL
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摘要: 为了探究污泥生物炭对Cd污染土壤的钝化修复效果，采用人工模拟Cd污染土壤进行盆栽实验，并探究了生物炭对Cd污染土壤pH、有机碳、Cd含量及价态、玉米株高、富集系数及生物转化系数的影响。结果表明：热解温度为800℃时制备的生物炭的修复效果优于300℃时制备的生物炭，且生物炭的最佳剂量为9.0 g/kg。施用800℃下制备的生物炭时，土壤中Cd含量也增加至7.9 mg/kg，较热解温度300℃增加约1.0 mg/kg。污泥生物炭显著降低了土壤中酸可提取态及还原态Cd的含量，升高了氧化态及残渣态Cd含量。当热解温度为800℃时，酸可提取态和还原态Cd含量分别降低至0.68，0.45 mg/kg，氧化态及残渣态Cd含量分别升高至0.76，1.72 mg/kg，从而降低了土壤中可生物利用Cd的含量。此外，生物炭能够降低Cd的生物富集系数及转化系数。Abstract: In order to explore the effect of sludge biochar on passivation and remediation of Cd-contaminated soil, pot experiments were conducted to simulate the Cd-contaminated soil, and the effect of biochar on pH, organic carbon, Cd content and its valence state, plant height, enrichment coefficient and biotransformation coefficient of Cd-contaminated soil were investigated. The experimental results showed that the biochar prepared at 800℃ had better repair effect than that prepared at 300℃, and the optimum dosage of biochar was 9.0 g/kg. The content of Cd in soil also increased to 7.9 mg/kg at 800℃, which was about 1.0 mg/kg higher than that under 300℃ pyrolysis. Sludge biochar significantly reduced the content of acid extractable and reduced Cd in soil, but increased the content of oxidized and residual Cd. When the pyrolysis temperature was 800℃, the Cd content of acid extractable and reduced state was reduced to 0.68 mg/kg and 0.45 mg/kg, respectively, and the Cd content of oxidation state and residue state was increased to 0.76 mg/kg and 1.72 mg/kg, respectively, thus reduced the content of bioavailable Cd in soil. In addition, biochar could reduce the bioconcentration and transformation coefficients of Cd.
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Key words:
- biochar /
- Cd /
- soil remediation /
- pyrolysis temperature /
- bioconcentration coefficient
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黄益宗, 郝晓伟, 雷鸣, 等. 重金属污染土壤修复技术及其修复实践[J]. 农业环境科学学报, 2013, 32(3):409-417. 李韵诗, 冯冲凌, 吴晓芙, 等. 重金属污染土壤植物修复中的微生物功能研究进展[J]. 生态学报, 2015,35(20):6881-6890. 孙鑫, 娄燕宏, 王会, 等. 重金属污染土壤的植物强化修复研究进展[J]. 土壤通报, 2017, 48(4):1008-1013. 于天一, 孙秀山, 石程仁, 等. 土壤酸化危害及防治技术研究进展[J]. 生态学杂志, 2014, 33(11):3137-3143. YANG X, LIU J J, MCGROUTHER K, et al. Effect of biochar on the extractability of heavy metals (Cd, Cu, Pb, and Zn) and enzyme activity in soil[J]. Environmental Science and Pollution Research, 2016, 23(2):974-984. ABBAS T, RIZWAN M, ALI S, et al. Effect of biochar on alleviation of cadmium toxicity in wheat (Triticum aestivum L.) grown on Cd-contaminated saline soil[J]. Environmental Science and Pollution Research, 2018, 25(26):25668-25680. 孙朋成, 黄占斌, 唐可, 等. 土壤重金属污染治理的化学固化研究进展[J]. 环境工程, 2014, 187(1):158-161. 王丹丹, 林静雯, 丁海涛, 等. 牛粪生物炭对重金属镉污染土壤的钝化修复研究[J]. 环境工程, 2016, 34(12):183-187. 牛晓丛, 何益, 金晓丹, 等. 酵素渣和秸秆生物炭钝化修复重金属污染土壤[J]. 环境工程, 2018,36(10):118-123. 易卿, 胡学玉, 柯跃进, 等. 不同生物质黑碳对土壤中外源镉(Cd)有效性的影响[J]. 农业环境科学学报, 2013, 32(1):88-94. 丁文川, 杜勇, 曾晓岚, 等. 富磷污泥生物炭去除水中Pb(Ⅱ)的特性研究[J]. 环境化学, 2012, 31(9):1375-1380. PARK J H, CHOPPALA G K, BOLAN N S, et al. Biochar reduces the bioavailability and phytotoxicity of heavy metals[J]. Plant and Soil, 2011, 348(1/2):439-451. LU K P, YANG X, GIELEN G, et al. Effect of bamboo and rice straw biochars on the mobility and redistribution of heavy metals (Cd, Cu, Pb and Zn) in contaminated soil[J]. Journal of Environmental Management, 2017, 186:285-292. LIANG B Q, LEHMANN J, SOHI S P, et al. Black carbon affects the cycling of non-black carbon in soil[J]. Organic Geochemistry, 2010, 41(2):206-213. LEHMANN J, RILLIG M C, THIES J, et al. Biochar effects on soil biota:a review[J]. Soil Biology and Biochemistry, 2011, 43(9):1812-1836. -
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