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热解条件对茶叶渣生物炭特性及镉污染土壤钝化效果的影响
Influence of pyrolysis conditions on properties of tea residue biochar and its passivation effect in Cd contaminated soil
投稿时间:2017-03-06  修订日期:2017-07-16
DOI:10.12030/j.cjee.201703050
中文关键词:  茶叶渣  生物炭  热解  土壤pH  SOC  DOC  镉形态
英文关键词:tea residue  biochar  pyrolysis  soil pH  SOC  DOC  cadmium fractions
基金项目:国家自然科学基金资助项目(21507095);四川农业大学兴趣性实验项目(20150152)
作者单位
李长欣 四川农业大学环境学院, 成都 611130 
吕严凤 四川农业大学环境学院, 成都 611130 
张梦迪 四川农业大学环境学院, 成都 611130 
蒋容 四川农业大学环境学院, 成都 611130 
冯映黎 四川农业大学环境学院, 成都 611130 
杨占彪 四川农业大学环境学院, 成都 611130 
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中文摘要:
      以泡饮过的废弃茶叶为实验原料,通过不同热解温度(300、400、500和600℃)和热解时间(1 h和2 h)制备生物炭,探讨不同热解条件对茶叶渣生物炭(TSBC)的特性及其对镉(Cd)污染土壤钝化效果的影响。结果表明:热解温度的升高可明显增加TSBC的pH和比表面积,降低生物炭的产率、电导率和表面官能团的数量,使TSBC具有弱碱性、较大比表面积和较强的稳定性,对改良酸性土壤和吸附重金属存在一定潜力;而热解时间对其特性没有明显差异,与对照组相比,添加TSBC明显增加了Cd污染土壤的pH、有机碳(SOC)和可溶性有机碳(DOC)含量,但随着制备温度的升高,Cd污染土壤中SOC和DOC增加幅度逐渐降低。添加TSBC显著降低Cd污染土壤中可交换态镉的比例,当热解温度为500~600℃时降幅最显著,其下降比例与对照相比最高可达25.56%;残渣态镉比对照增加了0.88~1.18倍。因此,TSBC对镉污染土壤有较好的钝化效果,这为重金属污染土壤的修复和生活废弃物的资源化利用提供了理论依据。
英文摘要:
      In order to study the effects of pyrolysis conditions on properties of tea residue biochar(TSBC) and its passivation effect of Cd-contaminated soil, TSBC derived from tea residues were produced under different pyrolysis temperatures (300,400,500 and 600℃) and pyrolysis times (one hour and two hours), respectively. The results showed the pyrolysis temperature increased with pH and surface area of TSBC, but decreased with its production, electrical conductivity and the number of surface functional groups. The weak alkaline, large surface area and strong stability of TSBC revealed the amendment and adsorption potential to acid soil improvement and heavy metals sorption. However, the effects of pyrolysis time on biochar properties were not significant. Compared with the control group, addition of TSBC significantly increased the soil pH, organic carbon(SOC) and dissolved organic carbon(DOC). But the increasing extent of SOC and DOC in Cd-contaminated soil reduced with the increase of pyrolysis temperature. Adding TSBC could decrease the proportion of exchangeable fraction of Cd. The proportion of exchangeable fraction of Cd reduced by 25.56% at pyrolysis temperature 500 to 600℃, which significantly higher than other pyrolysis temperature. The TSBC has the better effects to immobilize Cd in Cd-contaminated soil. The results provide theoretical basis for remediation of heavy metals contaminated soil and resource utilization of domestic waste.
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