蒸发过程中有机杂质影响下高盐废水多元盐相平衡关系研究

IF 2 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Lin Lin, Xiangcheng Kong, Lipeng He, Boya Zhang, Shujuan Liu, Jianliang Xue, Bo Wang, Meng Zheng, Lijun Chen
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引用次数: 0

摘要

预处理含盐废水中微量的有机杂质会影响含盐废水原有的溶解度,这是制约该工况下近零排放含盐废水蒸发的关键问题之一。本文研究了典型有机杂质在不同参数降膜蒸发管内的固液平衡关系。结果表明,存在有机杂质时,Na+, Mg2+//Cl—H2O的相图属于简单体系的相图。相图包含一个共饱和点、两条单变量曲线和四个结晶区。此外,随着温度的升高,Na+, Mg2+//Cl—H2O三元体系在有机杂质下的溶解度总体变化不显著。温度对MgCl2溶解度的影响较大,温度从303.15 K升高到373.15 K,溶解度提高了5.67%。该研究为合理控制煤化工蒸发过程中的盐结垢提供了理论依据。确保蒸发器的高效运行,实现无机盐产品的循环利用,最终实现“近零排放”的目标至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on multivariate salt phase equilibrium relationship of high-salt wastewater under the influence of organic impurities in evaporation process.

The small amount of organic impurities in the pre-treated saline wastewater will affect the original solubility of the saline wastewater, which is one of the key issues that restrict the evaporation of saline wastewater with near-zero discharge under the working condition. We have investigated the solid-liquid phase equilibrium relationship under typical organic impurities in falling film evaporation tubes with different parameters. Results show the phase diagram of Na+, Mg2+//Cl--H2O in the presence of organic impurities belongs to the phase diagram of a simple system. The phase diagram contains a co-saturation point, two single-variable curves and four crystallization zones. In addition, the overall change in the solubility of the ternary system of Na+, Mg2+//Cl--H2O under organic impurities was not significant with the increase in temperature. However, the solubility of MgCl2 was more affected by temperature and increased by 5.67% when the temperature increased from 303.15 K to 373.15 K. This study provides a theoretical basis for rational control of salt scaling in the evaporation process of coal chemical industry. It is important to ensure the efficient operation of the evaporator, realize the recycling of inorganic salt products, and ultimately achieve the goal of 'near-zero discharge'.

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来源期刊
Environmental Technology
Environmental Technology 环境科学-环境科学
CiteScore
6.50
自引率
3.60%
发文量
0
审稿时长
4 months
期刊介绍: Environmental Technology is a leading journal for the rapid publication of science and technology papers on a wide range of topics in applied environmental studies, from environmental engineering to environmental biotechnology, the circular economy, municipal and industrial wastewater management, drinking-water treatment, air- and water-pollution control, solid-waste management, industrial hygiene and associated technologies. Environmental Technology is intended to provide rapid publication of new developments in environmental technology. The journal has an international readership with a broad scientific base. Contributions will be accepted from scientists and engineers in industry, government and universities. Accepted manuscripts are generally published within four months. Please note that Environmental Technology does not publish any review papers unless for a specified special issue which is decided by the Editor. Please do submit your review papers to our sister journal Environmental Technology Reviews at http://www.tandfonline.com/toc/tetr20/current
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