电凝
废水
电容去离子
生物炭
吸附
磷
电极
流出物
磷酸盐
解吸
材料科学
化学
制浆造纸工业
电化学
环境工程
环境科学
有机化学
工程类
物理化学
热解
作者
Yushi Tian,Nianhua Chen,Xu Yang,Chunyan Li,Weihua He,Nanqi Ren,Guohong Liu,Wulin Yang
出处
期刊:Water Research
[Elsevier]
日期:2023-03-01
卷期号:231: 119645-119645
被引量:13
标识
DOI:10.1016/j.watres.2023.119645
摘要
Migrating electric field-assisted electrocoagulation (MEAEC) is a three-electrode electrochemical system, including waste flour-derived sponge biochar (SBC) as an adsorption electrode for efficient phosphorus removal from wastewater. The SBC was applied in the MEAEC system as a pseudo capacitance electrode with low energy consumption and reached an excellent effluent level (0.12 mg/L) with a 200-s treatment time in 1 mg/L phosphate synthetic wastewater. The SBC adsorption electrode had a total charge capacitance of 1.14 F/g with abundant micropores. Continuous charging and discharging at a constant voltage over 100 cycles demonstrated the excellent durability of the biochar electrodes. The energy demand of SBC-MEAEC was only 0.0058 kWh/m3 for 90% phosphate removal, which was 65% less than that of the control. The use of SBC in the MEAEC system greatly enhanced phosphate removal at low concentrations. In the SBC-MEAEC system, the electro-desorption synchronous electrocoagulation process demonstrated efficient concentration and release of ions after electro-adsorption. These results indicate that MEAEC with an SBC electrode could achieve a high level of phosphate removal with a much lower energy consumption than in previous studies. The recovered concentrated phosphorus flocs also contained fewer metal impurities than those in previous electrochemical approaches. The proposed desorption synchronous electrocoagulation utilizing waste-derived SBC electrodes provides a cost-effective pathway to treat low phosphorous-containing wastewater.
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