Potential of phosphorus recovery from sludge-based hydrochar by wet chemical method

被引：0
|
作者：
Xu J. [1 ,2 ]
Zhu J. [1 ,2 ]
Li J. [1 ,2 ]
Liu M. [1 ,2 ]
Gong H. [1 ,2 ]
机构：
[1] College of Environment and Ecology, Chongqing University, Chongqing
[2] Key Laboratory of Three Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 11期
关键词：
Acid leaching; Citric acid; Hydrochar; Hydrochloric acid; Phosphorus recovery; Sludge;
D O I：
10.11949/0438-1157.20210835
中图分类号：
学科分类号：
摘要：
Taking the phosphorus-rich sludge hydrothermal charcoal as the research object, the SMT method is used to analyze the phosphorus form distribution, and hydrochloric acid and citric acid are used as extractants to explore the potential of wet chemical recovery of phosphorus. The experimental results show that after hydrothermal carbonization of sludge, the total phosphorus content increased, the organic phosphorus is transformed into inorganic phosphorus, and the non-apatite inorganic phosphorus is transformed into apatite inorganic phosphorus. The forms of phosphorus in hydrochar are mainly inorganic and non-apatite inorganic phosphorus. Acid concentration, liquid-solid ratio and acid leaching time have significant effects on phosphorus leaching from hydrochar. Under the suitable acid leaching conditions (hydrochloric acid concentration 0.3 mol/L, liquid-solid ratio 50 ml/g, acid leaching time 240 min; citric acid concentration 0.1 mol/L, liquid-solid ratio 50 ml/g, acid leaching time 600 min), the phosphorus leaching efficiency of hydrochloric acid and citric acid can reach 94.34% and 88.78%, respectively. The pseudo-second order kinetic model can fit the leaching process of phosphorus in the two acid leaching systems well. Meanwhile, the leaching capacity of metal elements increased gradually with the increase of acid leaching time, and there is a linear correlation with the leaching capacity of phosphorus. The order of leaching capacity from large to small metals is Fe > Ca > Al >Mg. In addition, some heavy metal elements are also leached, and the order of leaching ability is Zn > Mn > Cr > Cu > Pb. After acid leaching, hydrochar has more pore structure, which is expected to be a good adsorption material. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：5779 / 5789
页数：10
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