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| Effects of crayfish shell biochar on remediation of Cd-As contaminated soil and soil dissolved organic carbon |
| Received:January 14, 2021 |
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| KeyWord:crayfish shell biochar;cadmium;arsenic;soil remediation;dissolved organic matter |
| Author Name | Affiliation | E-mail | | SUN Tao | College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of AgroEnvironment and Agro-Product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SUN Yuebing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of AgroEnvironment and Agro-Product Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | sunyuebing@aepi.org.cn | | JIA Hongtao | College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China | jht@xjau.edu.cn | | WU Zeying | Rural Energy and Environment Agency, Ministry of Agriculture and Rural affairs, Beijing 100125, China | |
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| Abstract: |
| This study aimed to explore the remediation effect and mechanism of crayfish shell biochar(CSBC) on cadmium(Cd)-and arsenic(As)-combined contaminated soils. More precisely, the soil incubation experiment was conducted to investigate that the effect of biochar prepared from crayfish shell by anaerobic pyrolysis with different dosages(0.5%, 1% and 3%) on soil physicochemical properties, the availability and fraction of Cd and As, and the content of dissolved organic matter in acidic soil in Guangdong and alkaline soil in Xinjiang. The results showed that CSBC application significantly increased the pH value and the contents of organic carbon, alkalihydrolyzable nitrogen, ammonium nitrogen, nitrate nitrogen, available phosphorus and potassium, and total nitrogen and phosphorus in soils (P<0.05). The CSBC treatments at dosages of 0.5%~3% in the acidic soil could increase the content of available As by 11.64%~24.53% compared to the control groups(CK), whereas it decreased the amount of available Cd by 15.76%~26.50% in acidic soils. The concentration of available As and Cd in alkaline soil significantly decreased(P<0.05) by 3.51%~8.12% and 4.43%~28.90%, respectively, compared with CK. The fraction of calcium-bound As was increased after applying CSBC and the fractionation of exchange Cd was converted to residue fraction. Compared with the CK, CSBC increased the concentration of soil dissolved organic carbon by 255.57% and 111.65% in acidic and alkaline soils, respectively. Moreover, the characteristic absorption of soil dissolved organic matter in the ultraviolet region and the dissolved organic matter aromaticity were enhanced. In summary, CSBC is a green and sustainable candidate with promising application potential in Cd and As remediation in alkaline soil as it not only effectively reduces the availability of heavy metals in soil, but also improves soil nutrient qualities. |
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