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Recovery of phosphate from aqueous solution by dewatered dry sludge biochar and its feasibility in fertilizer use

文献类型： 外文期刊

作者： Liu, Mengjie 1 ; Li, Ronghua 2 ; Wang, Jingwen 1 ; Liu, Xian 1 ; Li, Songling 3 ; Shen, Weibo 1 ;

作者机构： 1.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China

2.Minist Agr, Key Lab Plant Nutr & Agri Environm Northwest Chin, Yangling 712100, Shaanxi, Peoples R China

3.Qinghai Acad Agr & Forestry Sci, Xining 810016, Qinghai, Peoples R China

4.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China

关键词： Dewatered dry sludge; Biochar; Phosphorus; Adsorption; Fertilizer

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 814 卷

页码：

收录情况： SCI

摘要： Discharging of dewatered dry sludge into the environment can trigger irreversible environmental damage. The treatment of dewatered dry sludge into a valuable biochar product is essential for the sustainability of resources and environmental safety. In this study, we examined the removal of phosphate from water bodies by adsorption of biochar that had been prepared from dewatered dry sludge with different pyrolysis temperatures. We showed that being a composite material rich in carbon, CaO and MgO were produced in the biochar preparation when the pyrolysis temperature was increased to 700 degrees C. The phosphate adsorption of biochar has strengthened with the increase of pH. The phosphate adsorption of composite was fitted with the pseudo-second-order kinetic model, while the Langmuir adsorption isotherm model yielded a maximum phosphate adsorption of 51.79 mg/g. The phosphate adsorption by sludge biochar was mainly affected by the deposition of phosphate crystals and electrostatic attraction. Overall, biochar prepared from dewatered dry sludge demonstrated acceptable phosphate removal performance and phosphate-loaded biochar had a slow release of phosphorus, therefore, can be used as a phosphate fertilizer to promote plant growth.

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