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Article

The Recycling of Acid Wastewater with High Concentrations of Organic Matter: Recovery of H2SO4 and Preparation of Activated Carbon

by 1,2, 1,2, 1,2,3 and 1,2,3,*
1
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
2
National Engineering Laboratory for Industrial Wastewater Treatment, Chinese Academy of Sciences, Beijing 100085, China
3
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Xuliang Zhuang
Water 2022, 14(2), 183; https://doi.org/10.3390/w14020183
Received: 29 November 2021 / Revised: 30 December 2021 / Accepted: 5 January 2022 / Published: 10 January 2022
(This article belongs to the Special Issue Carbon Neutrality and Wastewater Treatment)
Little work has been focused on the recycling of hazardous acid waste with high concentrations of organic matter from petroleum refining. This study developed an innovative, effective, and simple method for the recycling of acid waste that can successfully resolve this significant problem in industry. After parameter optimization, the optimal process is as follows. (1) Through heat treatment at 170 °C, liquid acid waste was transformed into solid; (2) by washing the solids, 70% by weight of sulfuric acid was recycled; and (3) the solid residue after washing was activated by alkali (NaOH or KOH) at an alkali and organic carbon ratio of 2:1, at a temperature of 650 °C for 60 min, producing superior-grade activated carbon with a specific surface area of 1378 m2/g, a pore volume of 0.5107 cm2/g, an iodine number of 1800 mg/g, and a methylene blue adsorption capacity of 240 mg/g. Thus, in this way, both waste sulfuric acid and organic impurities are turned into valuable resources, and no hazardous waste gypsum residues are generated. This method both reduces carbon emissions and recycles valuable resources, which is of important environmental and economic significance. View Full-Text
Keywords: acid waste; heat treatment; recycle; sulfuric acid; activated carbon acid waste; heat treatment; recycle; sulfuric acid; activated carbon
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MDPI and ACS Style

Hu, X.; Kong, L.; Zhu, F.; Peng, X. The Recycling of Acid Wastewater with High Concentrations of Organic Matter: Recovery of H2SO4 and Preparation of Activated Carbon. Water 2022, 14, 183. https://doi.org/10.3390/w14020183

AMA Style

Hu X, Kong L, Zhu F, Peng X. The Recycling of Acid Wastewater with High Concentrations of Organic Matter: Recovery of H2SO4 and Preparation of Activated Carbon. Water. 2022; 14(2):183. https://doi.org/10.3390/w14020183

Chicago/Turabian Style

Hu, Xingyun, Linghao Kong, Feng Zhu, and Xianjia Peng. 2022. "The Recycling of Acid Wastewater with High Concentrations of Organic Matter: Recovery of H2SO4 and Preparation of Activated Carbon" Water 14, no. 2: 183. https://doi.org/10.3390/w14020183

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