Cadmium Decontamination of Polluted Yellow-brown Dryland Soil by Passivator
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摘要:
目的 研究施用不同钝化剂对黄棕壤旱地严格管控类土Cd的钝化效果,为以土壤类型划分的Cd污染土壤钝化修复提供理论参考。 方法 采用室内培养试验法,以贵州典型Cd超标黄棕壤为研究对象,将牛粪(NF)、玉米生物炭(SWT)、石灰(SH)、磷灰石(LHS)、膨润土(PRT)、方解石(FJS)、海泡石(HPS)、巨大芽孢杆菌(JDYB)和胶质芽孢杆菌(JZYB)作为钝化剂,通过室内培养70 d后,分析其土壤理化性质(pH、有机质、碱解氮、有效磷、速效钾)、Cd全量和有效态Cd含量的变化特征。 结果 (1)施用不同钝化剂均提高土壤pH 0.03~0.88,其中SH处理的土壤pH增幅最大,达14.94%。除SH、PRT、FJS和HPS会降低土壤有机质含量外,其他钝化剂均能有效增加土壤有机质含量,其中NF增加土壤有机质含量的幅度最大(31%)。相对其他钝化剂,NF对土壤速效养分(碱解氮、有效磷和速效钾)含量增加效果最好,分别增幅25.16%、31.89%和65.11%。(2)施用FJS会提高土壤Cd含量,而其他钝化剂均能降低土壤Cd含量0.1~0.26 mg·kg−1,其中LHS和HPS对土壤Cd含量的降低效果最好。(3)与对照相比,SH降低土壤有效态Cd含量的幅度最大(30.56%),而不同钝化剂对土壤Cd的钝化效果分别表现为SH(36%)>LHS(35%)>SWT(28%)>NF(26%)>FJS(23%)>PRT(22%)>JDYB(20%)>HPS(18%)>JZYB(14%)。 结论 NF对黄棕壤中的养分指标提升效果最好,而SH对黄棕壤Cd的钝化效果最为理想。 Abstract:Objective Passivator were applied on cadmium-contaminated yellow-brown dryland soil to determine the antipollution efficiency. Method In an indoor culture experiment, a typical Cd-contaminated soil collected from a strictly controlled yellow-brown dryland in Guizhou was treated with cow manure (NF), corn biochar (SWT), lime (SH), apatite (LHS), bentonite (PRT), calcite (FJS), sepiolite (HPS), Bacillus megaterium (JDYB), or B. glialis (JZYB) as the deactivation agents. After 70 d of the treatments, the soils were tested for pH, organic matters, alkaline hydrolysable nitrogen, effective variation characteristics of phosphorus and available potassium, as well as total and available Cd. Result (1) The various agents raised the soil pH by 0.03–0.88 with the greatest 14.94% increase induced by SH. And all of them, aside from SH, PRT, FJS, and HPS, significantly raised the organic matter content with the greatest increase of 31% over control by NF. NF also exerted the most increases on the available nutrients, such as 25.16% on alkaline-hydrolysable nitrogen , 31.89% on available phosphorus and 65.11% on available potassium. (2) FJS escalated the Cd in soil, but all other deactivation agents reduced the content by 0.1–0.26 mg·kg−1, with LHS and HPS rendering the largest reduction. (3) Compared to the control, SH reduced the available Cd most by 30.56%. The efficacies of the tested agents ranked SH (36%)>LHS (35%)>SWT (28%)>NF (26%)>FJS (23%)>PRT (22%)>JDYB (20%)>HPS (18%)>JZYB (14%). Conclusion Among the deactivation agents studied, NF exhibited the greatest improvement on the nutrient indices of the yellow-brown dryland soil and SH on Cd mitigation. -
Key words:
- passivator /
- yellow-brown soil /
- cadmium /
- decontamination effect /
- physiochemical properties
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表 1 不同钝化剂基本信息
Table 1. Basic information on passivator tested
钝化剂
Passivator主要成分
Main ingredientpH值
pH value牛粪
Cow dung (NF)有机质≥13.50%
Organic matter≥13.50%7.80 生物炭
Biochar(SWT)玉米生物炭
Corn biochar7.77 石灰
Lime(SH)CaO≥56.03% 12.38 磷灰石
Apatite(LHS)P2O3≥42.06% 7.62 膨润土
Bentonite(PRT)SiO2≥66.7%;
Al2O3≥28.3%8.83 方解石
Calcite(FJS)CaO≥56.03% 8.90 海泡石
Sepiolite(HPS)SiO2≥55.65%;
MgO≥24.89%7.69 巨大芽孢杆菌
Bacillus megaterium(JDYB)有效活菌数1×1010cfu·g−1
Viable bacteria 1×1010cfu·g−16.89 胶质芽胞杆菌
Bacillus glialis(JZYB)有效活菌数1×1010cfu·g−1
Viable bacteria 1×1010cfu·g−16.79 表 2 土壤理化指标与土壤Cd活性的相关性
Table 2. Correlation between physicochemical indices and Cd activity in soil
指标
Index土壤Cd含量
Soil Cd content土壤有效态Cd
Soil available CdCd钝化率
Cd passivation ratepH −0.317 −0.650* 0.41 有机质
Organic matter−0.04 0.221 −0.068 碱解氮
Alkaline hydrolyzed Nitrogen0.005 0.105 0.120 有效磷
Available phosphorus−0.336 −0.755* 0.609 速效钾
Available potassium−0.411 −0.246 0.057 *表示显著相关。
* means significant correlation. -
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