Research on desulfurization wastewater evaporation: Present and future perspectives

Ma, Shuangchen; Chai, Jingchao; Chen, Gongda; Yu, Wan-Chin; Zhu, Shengli

doi:10.1016/j.rser.2015.12.252

Cited by 119 publications

(35 citation statements)

References 28 publications

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“…he modern industries (e.g., seawater desalination, mining, petrochemical, food, and power generation) produce concentrated waste brine byproducts every day [1][2][3][4][5][6] . The volumes of these brines range from hundreds of liters to tens of thousands of cubic meters per day, depending on the type and scale of the industrial sectors.…”

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confidence: 99%

Designing a next generation solar crystallizer for real seawater brine treatment with zero liquid discharge

et al. 2021

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Proper disposal of industrial brine has been a critical environmental challenge. Zero liquid discharge (ZLD) brine treatment holds great promise to the brine disposal, but its application is limited by the intensive energy consumption of its crystallization process. Here we propose a new strategy that employs an advanced solar crystallizer coupled with a salt crystallization inhibitor to eliminate highly concentrated waste brine. The rationally designed solar crystallizer exhibited a high water evaporation rate of 2.42 kg m−2 h−1 under one sun illumination when treating real concentrated seawater reverse osmosis (SWRO) brine (21.6 wt%). The solar crystallizer array showed an even higher water evaporation rate of 48.0 kg m−2 per day in the outdoor field test, suggesting a great potential for practical application. The solar crystallizer design and the salt crystallization inhibition strategy proposed and confirmed in this work provide a low-cost and sustainable solution for industrial brine disposal with ZLD.

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confidence: 99%

Designing a next generation solar crystallizer for real seawater brine treatment with zero liquid discharge

et al. 2021

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“…The NaCl solution was taken as feed solution, and pure water was used as the cooling substance. T f was set from 45 to 75 °C according to the fact that the desulfurization wastewater temperature was about 50 °C [ 41 ]. The temperature difference of feed and permeate solution was from 20 to 50 °C.…”

Section: Methodsmentioning

confidence: 99%

Simulation Study on Direct Contact Membrane Distillation Modules for High-Concentration NaCl Solution

Zhao

et al. 2020

Membranes

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Membrane distillation technology, as a new membrane-based water treatment technology that combines the membrane technology and evaporation process, has the advantages of using low-grade heat, working at atmospheric pressure with simple configuration, etc. In this study, heat and mass transfer were coupled at the membrane surfaces through the user-defined function program. The effects of feed temperature, feed velocity and permeate velocity on temperature polarization were mainly investigated for a high-concentration NaCl solution. The temperature polarization was increased with the increase of feed temperature and the decrease of feed and permeate velocity. The effects of temperature, inlet velocity and solution concentration on the evaporation efficiency of the membrane module for co- and counter-current operations were investigated in detail. The counter-current operation performed better than co-current operation in most cases, except for the condition where the NaCl concentration was relatively low or the module length was long enough. In addition, the optimal membrane thickness for both PVDF and PTFE was studied. The optimal membrane thickness was found in the range of 10 to 20 μm, which corresponded to the highest permeate flux for the selected materials, pore size distribution, and operation conditions. Membrane material with lower thermal conductivity and larger porosity was prone to get higher permeate flux and had larger optimal membrane thickness. Increasing feed velocity or feed temperature could decrease the optimal membrane thickness.

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“…In order to maintain the material balance in the slurry circulation system of an FGD device, prevent the chlorine concentration in the flue gas from exceeding the specified value and ensure gypsum quality a certain amount of wastewater must be discharged from the system. However, desulfurization wastewater contains various suspended solids, supersaturated sulfites, sulfates and heavy metals [9]. If not handled properly, it will cause serious secondary pollution to the environment.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, spray drying technology, an advanced ZLD process of desulfurization wastewater, 2 of 20 has received more attention [17]. One technical approach is to spray wastewater into the flue between the air preheater and electrostatic precipitator and use the preheating and evaporation of the flue gas [9,18]. Then, the crystalline salt and dust are captured by the precipitator.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Centrifugal Spray Evaporation Characteristics and Process Optimization of Desulfurization Wastewater

Zhao

Feng

et al. 2021

Coatings

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As an advanced treatment of desulfurization wastewater, centrifugal spray drying technology, which can achieve a zero liquid discharge target, has attracted wide attention and great interest in recent years. However, the results of previous studies were based on the laboratory-scale centrifugal spray dryer. In order to study the evaporation characteristics of desulfurization wastewater and the parameter optimization of the dryer, the evaporation model of wastewater droplets was established. The effects of parameters such as the angle of the deflectors, gas–liquid ratio and atomizer speed on droplet evaporation were studied by numerical simulation. The results show that with the increase in the angle of the deflectors, the swirl effect of flue gas flow field is more obvious and the time and axial distance required for the complete evaporation of the droplets are shorter. Reducing the gas–liquid ratio will make the average evaporation time longer. Moreover, a higher atomizer speed is helpful for the evaporation of the droplets. The optimum gas–liquid ratio and rotational speed are found to be 9300 m3/Nm3 and 16,000 rpm, respectively.

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Research on desulfurization wastewater evaporation: Present and future perspectives

Cited by 119 publications

References 28 publications

Designing a next generation solar crystallizer for real seawater brine treatment with zero liquid discharge

Designing a next generation solar crystallizer for real seawater brine treatment with zero liquid discharge

Simulation Study on Direct Contact Membrane Distillation Modules for High-Concentration NaCl Solution

Simulation Study on Centrifugal Spray Evaporation Characteristics and Process Optimization of Desulfurization Wastewater

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