Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 419, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126343
Keywords
Sludge biochar; Persulfate; Advanced wastewater treatment; Electron transfer; Waste utilization
Categories
Funding
- National Natural Science Foundation of China [52070151, 51708443]
- Key Research and Development Project of Shaanxi Province [2019ZDLSF05-03]
- New Style Think Tank of Shaanxi Universities
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By enlarging the specific surface area of sludge biochar, the catalytic performance can be improved with reduced dosage of biochar and oxidant, leading to cost-effectiveness and eco-friendliness. The combination of biochar and PS showed efficient removal of organic compounds in wastewater, confirming its environmental friendliness. The sludge biochar adsorbent/PS catalytic system provides a promising and efficient way for advanced wastewater treatment.
Via enlarging the specific surface area of sludge biochar to enhance the close contact of multiple reactants may be a simple route to improve the catalytic performance with reduced dosage of biochar and oxidant, benefitting for cost-effectiveness and eco-friendliness. Herein, PS activation ability of a reported sludge-derived biochar adsorbent was investigated. 80% TOC of 100 mL 10 mg/L BPA was removed within 40 min by 7 mg biochar and 0.5 mM PS mixed, with a relatively high PS activation efficiency close to 50%. Expectedly, the desired mineralization efficiency of complex actual wastewater was also identified. Eco-friendliness of the application mode was confirmed by the leaching toxicity and acute bio-toxicity tests. Physicochemical properties of the sludge biochar were comprehensively characterized by various techniques. Combined with a series of mechanism analysis, center dot OH, SO4-, center dot O-2(-), O-1(2), free electron all participated in pollutants removal process and the non-radical pathway of electron transfer dominated the reaction. The generated metastable complex [SBC-PS*] confirmed by in situ FT-IR and Raman spectra was the most important active species for electron transfer and PS decomposition. Due to the high efficiency and stability, the sludge biochar adsorbent/PS catalytic system provides a promising way for waste reuse and advanced wastewater treatment.
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