文章摘要
李宝贵,刘源,陶甄,赵志娟,樊涛,李中阳.前期灌溉养殖废水和再生水对土壤吸附镉能力的影响[J].农业环境科学学报,2021,40(6):1244-1255.
前期灌溉养殖废水和再生水对土壤吸附镉能力的影响
Effects of irrigation using antecedent reclaimed water and livestock wastewater on the cadmium adsorption capacity of soils
投稿时间:2020-12-29  
DOI:10.11654/jaes.2020-1519
中文关键词: 前期灌溉  再生水  养殖废水  土壤    吸附
英文关键词: antecedent irrigation  reclaimed water  livestock wastewater  soil  cadmium  adsorption
基金项目:“十三五”国家重点研发计划项目(2017YFD0801103-2);国家自然科学基金项目(41701265);河南省科技攻关计划项目(202102110215)
作者单位E-mail
李宝贵 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院研究生院, 北京 100081 
 
刘源 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院农业水资源高效安全利用重点开放实验室, 河南 新乡 453002 
 
陶甄 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院研究生院, 北京 100081 
 
赵志娟 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院农业水资源高效安全利用重点开放实验室, 河南 新乡 453002 
 
樊涛 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院农业水资源高效安全利用重点开放实验室, 河南 新乡 453002 
 
李中阳 中国农业科学院农田灌溉研究所, 河南 新乡 453002
中国农业科学院农业水资源高效安全利用重点开放实验室, 河南 新乡 453002 
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中文摘要:
      为揭示前期不同非常规水源灌溉后土壤吸附镉(Cd)能力的变化及其影响因素,采用吸附动力学试验、等温吸附试验及Cd形态解吸试验,以去离子水为对照,研究了养殖废水和再生水灌溉后潮土和红壤吸附Cd能力的变化规律和影响因素。与对照相比,不论Cd初始浓度高低,再生水灌溉均显著减少了两种土壤对Cd的吸附;养殖废水灌溉在低Cd浓度时(5 mg·L-1和10 mg·L-1)显著降低了两种土壤对Cd的吸附,但在高Cd浓度时(25 mg·L-1和50 mg·L-1)增加了两种土壤对Cd的吸附。Freundlich模型能够较好地拟合所有土壤对Cd的吸附,拟合结果也表明养殖废水灌溉土壤对Cd吸附能力较强,而再生水灌溉土壤对Cd的吸附能力较弱。两种土壤吸附的Cd均以络合态为主,养殖废水和再生水灌溉主要通过影响土壤pH、黏粒含量、盐分和Cu含量而影响土壤吸附的络合态和交换态Cd含量,进而改变土壤对Cd的吸附能力。再生水灌溉后土壤对Cd的吸附能力降低,而养殖废水灌溉后土壤对Cd的吸附能力变化因Cd初始浓度而异。
英文摘要:
      In order to reveal the effects on Cadmium(Cd)adsorption by soils antecedently irrigated with unconventional water sources and the influencing factors, fluvo-aquic and red soils were used, and deionized-water irrigation was set as the control(CK). Cd adsorption kinetics, isothermal adsorption, and Cd form desorption experiments were conducted. Compared with CK, reclaimed water irrigation significantly reduced Cd adsorption by these two soils; livestock wastewater irrigation significantly reduced Cd adsorption of both soils at lower Cd concentrations(5 mg·L-1 and 10 mg·L-1)but increased Cd adsorption at higher Cd concentrations(25 mg·L-1 and 50 mg·L-1). The Freundlich model fitted Cd adsorption of all soils well, and the fitting results indicated that the Cd adsorption capacity of soils irrigated with livestock wastewater was stronger, whereas the opposite was true for reclaimed water. Cd adsorbed by these two soils mainly existed in the complexed form. Livestock wastewater and reclaimed water irrigation could affect soil pH, clay, salt and Cu contents. Consequently, the complexed and exchangeable form, as well as the total Cd adsorbed by these two soils, were altered. In conclusion, the Cd adsorption capacity of soils is reduced after reclaimed water irrigation, while the scenarios vary depending on initial Cd concentration after livestock wastewater irrigation.
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