Experimental investigation and theoretical modeling on scale behaviors of high salinity wastewater in zero liquid discharge process of coal chemical industry

Lü, Kai; Yang, Lü; Bai, Youxiang; Zhang, Jueru; Bie, Nanxi; Ren, Yongsheng; Ma, Yulong

doi:10.1016/j.cjche.2020.01.001

Cited by 15 publications

(2 citation statements)

References 18 publications

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“…The disposal of saline water generated from the chemical industry has been gaining interest, due to its potentially detrimental effect on terrestrial and aquatic ecosystems [ 3 , 4 ]. Typically, the presence of high salinity in this waste stream makes it difficult to treat using a conventional biochemical system, because of the adverse effects of salt on microbial flora.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Acid and Alkaline from Industrial Saline Wastewater by Bipolar Membrane Electrodialysis under High-Chemical Oxygen Demand Concentration

Lü

Shao

et al. 2022

Molecules

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Actual high saline wastewater containing concentrated organics and sodium chloride is a bioenergy and renewable resource. This study compared two different bipolar membrane electrodialysis membranes from two companies’ stacks to recover HCl and NaOH from sodium chloride solution and actual chemical wastewater. The results demonstrated that the electrolysis rates were around 1.5 kg/m2h, the HCl and NaOH production rates were about 0.9 kg/m2h, energy consumption was in the range of 1.05–1.27 kWh/kg, and the economic benefits were above 1 yuan/h in BMED systems. From analyzing the performance of seven different BMED membrane stacks, the B2 stack was chosen for electrolyzing actual high salt wastewater to observe the effect of chemical oxygen demand on BMED systems, where electrolytic salt performance, HCl-NaOH alkali production rates, and energy consumption show linear dependence on time for 5000 mg/L chemical oxygen demand wastewater. It illustrated chemical oxygen demand can enhance energy consumption and reduce electrolytic salt performance and the acid and alkali production rates, due to improving the membrane area resistance. In this study, the effect of high COD saline wastewater on the performance of a BMED membrane stack was clarified and the mechanism was analyzed for its practical application in treating chemical high salt wastewater.

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Section: Introductionmentioning

confidence: 99%

Recovery of Acid and Alkaline from Industrial Saline Wastewater by Bipolar Membrane Electrodialysis under High-Chemical Oxygen Demand Concentration

Lü

Shao

et al. 2022

Molecules

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“…Among the more mature evaporation technologies, Multiple Effect Distillation (MED) and Mechanical Vapor Recompression (MVR) were processing technologies with falling film evaporator as the core, and their excellent evaporation characteristics made them occupy an indispensable position in the field of desalination (Kouhikamali et al 2014). However, high-salt wastewater may have caused equipment scaling in the evaporation process, which not only affected the heat transfer performance of the equipment but also caused waste of resources (Zhao et al 2019;Lu et al 2020). Thus, it was necessary to study the problem of equipment salt scaling in coal chemical high salt wastewater salt extraction technology to achieve more efficient recycling of inorganic salts.…”

Section: Introductionmentioning

confidence: 99%

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Liu

et al. 2022

Water Supply

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It was important to master firstly scaling mechanism to slow down scaling, which was one of the important problems faced by saline wastewater treatment with falling film evaporators. In this paper, the phase equilibrium data of ternary system NaCl-CaCl2-H2O at 303.15–373.15 K were measured, and the prediction of the flow characteristics and scaling tendency of salt-containing wastewater in the evaporation tube was investigated by numerical simulation based on the phase equilibrium results. The results showed that the mesostable phase diagram of the ternary system was of simple type, and w(NaCl) and w(CaCl2) showed regular variation with temperature when w(NaCl) in the system was 15–28%. Moreover, the components of the four saline wastewaters (10% NaCl + 9, 10, 11, 12% CaCl2) with less salt content had a faster heating and a faster rate of evaporation of the liquid film in the evaporation tube. Based on the solubility in the experiments and simulations, it was concluded that NaCl crystals were precipitated at tube lengths of 718 mm, 942 mm, 966 mm, and 1,000 mm for four salt concentrations in the evaporation process by comparison, and the reliability of the predicted loci was also demonstrated by a falling film evaporation experimental setup.

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Study on salt crystals fouling on the tubing surface for energy storage salt cavern during debrining

Xie,

Jiang,

Liao

et al. 2025

Chemical Engineering Science

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Experimental investigation and theoretical modeling on scale behaviors of high salinity wastewater in zero liquid discharge process of coal chemical industry

Cited by 15 publications

References 18 publications

Recovery of Acid and Alkaline from Industrial Saline Wastewater by Bipolar Membrane Electrodialysis under High-Chemical Oxygen Demand Concentration

Recovery of Acid and Alkaline from Industrial Saline Wastewater by Bipolar Membrane Electrodialysis under High-Chemical Oxygen Demand Concentration

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Study on salt crystals fouling on the tubing surface for energy storage salt cavern during debrining

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