Review on treatment technology of salt wastewater in coal chemical industry of China

Shi, Jingxin; Huang, Wenping; Han, Hongjun; Xu, Chunyan

doi:10.1016/j.desal.2020.114640

Cited by 139 publications

(34 citation statements)

References 43 publications

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“…Biochemical treatment is commonly reported at present, However, some issues are raised subsequently, such as large floor areas, a mass of sludge produced, seasonal production against for its extending, etc (Amor et al 2019). Membrane treatment is also one of the common methods, but the COD of the influent must be lower than 80 mg/L and has a strict requirement for AOPs (Shi et al 2020). In comparison, the adsorption method has attracted substantial attention because of its low energy consumption, high efficiency, and low cost (Herbert et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Sun

Zhao

et al. 2021

Water Science and Technology

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Carboxylic acids are the main pollutant of industrial wastewater during the Advanced Oxidation Process (AOPs). In this study, we here study a resin-based spherical activated carbon (RSAC, AF5) as an adsorbent and use acetic acid as a model substrate for adsorption investigation. The pH = 3, temperature = 298 K were fixed by batch technique. The pseudo-second-order kinetic model, the intraparticle and external models are fitted well, and it was found that the adsorption of acetic acid onto AF5 was controlled by liquid film diffusion. Freundlich model indicates the adsorption process is heterogeneous multi-molecular layer adsorption on the surface. AF5 shows good regenerative ability; the recovery rate of adsorption capacity is ∼88% after 5 cycles. And COD adsorption removal rate can be maintained 100% for over 35 h in an actual AOPs effluent, and it can be eluted for 100% after 8 h by 0.8wt% NaOH. The characterizations, including XRF, XRD, TG/DSC,FTIR, SEM and N2 adsorption, show that the excellent adsorption performance is mainly due to the microporous structure and large specific surface area (1,512.88 m2/g), the adsorption mechanism mainly including pore filling effect and electrostatic attraction. After five adsorption-recycles, AF5's pore characteristic does not change significantly. This study provided a scientific basis for the wastewater standard discharge process of AOPs coupled adsorption.

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Section: Introductionmentioning

confidence: 99%

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Sun

Zhao

et al. 2021

Water Science and Technology

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“…Among these technologies, pressure-driven membranes like reverse osmosis (RO) membranes are promising alternatives for FGD wastewater treatment with the potential to meet the standards [6]. RO membrane has been considered for a wide range of wastewater treatments and reuses, from the steel industry to the food industry to personal care products, and almost all the core reuse technologies are based on reverse osmosis [9][10][11][12]. It is also one of the most widespread methods for water purification and seawater desalination [13].…”

Section: Introductionmentioning

confidence: 99%

Reverse Osmosis Membrane Combined with Ultrasonic Cleaning for Flue Gas Desulfurization Wastewater Treatment

Chen

Dou

et al. 2022

Water

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Flue gas desulfurization (FGD) wastewater treatment is currently of interest, as stringent standards have been released in order to limit the pollution emissions from the energy industry, and concerns about water scarcity are also increasing. Reverse osmosis (RO) membrane is a promising alternative for highly efficient FGD wastewater treatment. However, membrane fouling strongly limits its application. This study developed a suitable treatment system by combining RO membrane with ultrasonic cleaning. The introduction of low-frequency and high-intensity ultrasonic cleaning improved the cleaning efficiency of membrane fouling, as the permeate flux recovered 49% of the reduced value within 10 min of cleaning. The lifespan of the membrane was also extended, as the time of permeate flux declined to the same level, increasing from 2 h to 4 h after ultrasonic cleaning. The effluent of the system could meet the standard of desulfurization wastewater treatment. The treatment system is feasible for FGD wastewater treatment at a laboratory scale. These findings proved that the combination of RO membrane and ultrasonic cleaning could be applied to FGD wastewater treatment. The study provided an efficient, cost-saving, and convenient way to develop the FGD wastewater treatment system.

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“…NF has been widely used for trapping divalent and hypervalent ions in ZLD process. Compared with water softening by chemical precipitation, water softening by NF membrane can reduce chemical and energy consumption, decrease operating cost, and increase operation safety (Fang et al 2013;Shi et al 2020). However, there are still lots of divalent ions in NF brine, which are mostly removed by chemical softening or seeded precipitation (Sanciolo et al 2012;Liu et al 2016;Sanciolo & Gray 2017).…”

Section: Introductionmentioning

confidence: 99%

Pilot-scale study on seeded precipitation assisted nanofiltration for flue-gas desulfurization wastewater softening

Duan

Zhong

Tong

et al. 2022

Water Science and Technology

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In order to reduce the cost of chemical softening, the seeded precipitation assisted nanofiltration (NF) process was introduced into zero liquid discharge (ZLD) of flue-gas desulfurization (FGD) wastewater treatment. A pilot-scale system was developed and run for 168 h in a coal-fired power plant. The system mainly consists of lime softening, ambient temperature crystallizer (ATC) and NF, in which the raw water treatment capacity was 1 m3/h. The results indicated that the system operated stably, the softening cost was 13.30 RMB/m3, and the electricity cost was 3.39 RMB/m3 for the FGD wastewater in this pilot system. High quality gypsum was got from the ATC unit, of which the purity was 95.8%. Through this system, the hardness removal rate was higher than 98.9% and the water recovery rate reached 96%. In addition, the pressure and permeate flux kept stable in ultrafiltration (UF) unit and NF unit, indicating no scaling occurred in the two units during 168 h test. Thus, a feasible and cost-effective process was provided by using the seeded precipitation assisted NF to deal with the FGD wastewater.

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Review on treatment technology of salt wastewater in coal chemical industry of China

Cited by 139 publications

References 43 publications

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Reverse Osmosis Membrane Combined with Ultrasonic Cleaning for Flue Gas Desulfurization Wastewater Treatment

Pilot-scale study on seeded precipitation assisted nanofiltration for flue-gas desulfurization wastewater softening

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