首页|Retention and release of diethyl phthalate in biochar-amended vegetable garden soils

Retention and release of diethyl phthalate in biochar-amended vegetable garden soils

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  • NETL
  • NSTL
  • Springer Nature
Purpose Diethyl phthalate (DEP) is one of the most commonly used plasticizers as well as a soil contaminant. Using biochar to remediate soils contaminated with DEP can potentially reduce the bioavailability of DEP and improve soil properties. Therefore, a laboratory study was conducted to evaluate the effect of biochar on soil adsorption and desorp-tion of DEP. Materials and methods Two surface soils (0-20 cm) with contrasting organic carbon (OC) contents were collected from a vegetable garden. Biochars were derived from bamboo (BB) and rice straw (SB) that were pyrolyzed at 350 and 650 ℃. Biochars were added to two types of soil at rates of 0.1 and 0.5 % (w/w). A batch equilibration method was used to measure DEP adsorption-desorption in biochar treated and untreated soils at 25 ℃. The adsorption and desorption isotherms of DEP in the soils with or without biochar were evaluated using the Freundlich model. Results and discussion The biochar treatments significantly enhanced the soil adsorption of DEP. Compared to the untreated low organic matter soil, the soils treated with 0.5 % 650BB increased the adsorption by more than 19,000 times. For the straw biochar treated soils, the increase of DEP adsorption followed the order 350SB＞650SB. However, for the bamboo biochars, the order was 650BB＞350BB. Bamboo biochars were more effective than the straw biochars in improving soils' adsorption capacity and reducing the desorption ability of DEP. Conclusions Adding biochar to soil can significantly enhance soil's adsorption capacity on DEP. The 650BB amended soil showed the highest adsorption capacity for DEP. The native soil OC contents had significant effects on the soils' sorption capacity treated with 650BB, whereas they had negligible effects on the other biochar treatments. The sorption capacity was affected by many factors such as the feedstock materials and pyrolysis temperature of biochars, the pH value of biochar, and the soil organic carbon levels.

AdsorptionBiocharDesorptionDiethyl phthalateSoil contamination

Xiaokai Zhang、Lizhi He、Ajit K. Sarmah、Kunde Lin、Yingkun Liu、Jianwu Li、Hailong Wang

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Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China

Department of Civil and Environmental Engineering, Faculty of Engineering, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand

College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310032, China

The Nurturing Station for the State Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China

Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China,The Nurturing Station for the State Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, Hangzhou, Zhejiang 311300, China

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2014

10.1007/s11368-014-0929-x

Journal of soils & sediments

Journal of soils & sediments

ISSN：1439-0108
年,卷(期)：2014.14(11)
  • 30
  • 39