文献类型：期刊文献

英文题名：Internal reuse of methanol-to-olefin wastewater based on micro-channel separation coupling hydrocyclone regeneration

作者：Liu, Bing[1,2];Ma, Hongpeng[3];Huang, Qizhong[4];Chen, Jianqi[1];Huang, Yuan[5];Huang, Haitao[1];Wei, Qi[1];Wang, Hualin[1,2];Lv, Wenjie[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[3]Northwestern Polytech Univ, Key Lab Special Funct & Smart Polymer Mat, Minist Ind & Informat Technol, Xian 710072, Peoples R China;[4]China Energy Grp Yulin Chem Co Ltd, Yulin 719300, Peoples R China;[5]Shanghai Univ, Inst Environm Pollut & Hlth, Shanghai 200444, Peoples R China

年份：2023

卷号：345

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：;EI(收录号：20230094371);WOS:【SCI-EXPANDED(收录号:WOS:001073954200001)】；

基金：This work was supported by the National Natural Science Foundation of China (52030001) .

语种：英文

外文关键词：Methanol-to-olefin (MTO); Waste catalyst; Micro-channel separation; XDLVO theory; Media enhanced regeneration

摘要：Methanol-to-olefin (MTO) is a typical new coal chemical industry example. Due to the large volume of generated wastewater, complex composition including catalysts, aromatics and various oxygen-containing compounds, and serious environmental hazard, wastewater recycling is critical for sustainable industrial development and ecological protection. Herein, a swirl regenerating micro-channel separation (SRMS) technology was proposed to integrate deep filtration and hydrocyclone-enhanced regeneration. A small-scale experimental investigation was first conducted to verify the feasibility of the MTO wastewater treatment. A pilot SRMS device with a treatment capacity of 20 m(3)/h was constructed, and the device's continuous operation effect and stability were comprehensively evaluated. The separation performance of the SRMS device at different solution pH values and the impact of the hydrocyclone-enhanced regeneration of separation media were discussed in detail. At low solution pH values (<7), the SRMS device exhibits an average separation efficiency of 92.0% for fine particulate matter in wastewater, and the median particle size, d(50), decreases from 1.55 to 0.6 mu m. As the solution pH increases, the repulsive energy barrier for the medium-contaminant and contaminant-contaminant increases, inhibiting the deposition behavior of particulate pollutants. In addition, hydrocyclone desorbs contaminants deposited on the separation media and the average contaminant residual rate decreases from 3.3 to 0.2 wt%. We propose an industrial application for treating and reusing MTO wastewater (200 m(3)/h) using the SRMS technology based on the experimental results. The costs of the wastewater treatment process are as low as 0.25 CNY/m(3), and the wastewater reuse rate is over 97% without chemical consumption. This work can provide an environmentally friendly and economically sustainable approach to the source management of MTO wastewater.