A review on the coal gasification wastewater treatment technologies: past, present and future outlook

Ji, Qinhong; Tabassum, Salma; Hena, Sufia; Silva, Cláudia G.; Yu, Guangxin; Zhang, Zhenjia

doi:10.1016/j.jclepro.2016.02.147

Cited by 203 publications

(95 citation statements)

References 81 publications

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“…Coal slurry is industrial wastewater which is in the process of wet-processing in the coal preparation plant [73,74]. The coal slurry wastewater is mainly a mixture of water and fine coal powder, and the solid particles are fine and the turbidity is high.…”

Section: Coal Slurrymentioning

confidence: 99%

Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

et al. 2020

IJERPH

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In recent years, close attention has been paid to microbial flocculants because of their advantages, including safety to humans, environmental friendliness, and acceptable removal performances. In this review, the preparation methods of microbial flocculants were first reviewed. Then, the performances of bioflocculants in the removal of suspended solids, heavy metals, and other organic pollutants from various types of wastewater were described and commented, and the removal mechanisms, including adsorption bridging, charge neutralization, chemical reactions, and charge neutrality, were also discussed. The future research needs on microbial flocculants were also proposed. This review would lead to a better understanding of current status, challenges, and corresponding strategies on microbial flocculants and bioflocculation in wastewater treatment.

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Section: Coal Slurrymentioning

confidence: 99%

Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

et al. 2020

IJERPH

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“…During the past decades, the urgent situation with scarcity of domestic crude oil and natural gas as well as relative abundance of coal resource has significantly boosted the development of coal-based chemical industries in China [1]. However, these industries inevitably produce massive coking wastewaters during coal gasification, coal gas purification and by-product recovery processes [2,3]. In general, the coking wastewater contains plenty of nonbiodegradable and refractory organic pollutants that are highly concentrated, toxic and carcinogenic [4].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic adsorption properties of raw coal fly ash for quinoline from aqueous solution: kinetic and equilibrium studies

Huang

Chen

et al. 2019

SN Appl. Sci.

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Fly ash and quinoline are two major waste materials produced by the large scale utilization of coal. This study describes the investigation into the intrinsic adsorption properties of raw coal fly ash toward quinoline in the aqueous solution. The adsorbent was characterized using XRF, SEM, BET, and XRD. Batch experiments were performed to detect the influences of adsorption conditions on the adsorption capacity of coal fly ash. The results show that the amounts of adsorbed quinoline increase with the increment of initial quinoline concentration and contact time. The potential adsorption mechanism and rate-determining steps were illustrated by analyzing adsorption equilibrium with Langmuir, Freundlich and Redlich-Peterson isotherm models and correlating the experimental results with several kinetic models. It was noticeable that the adsorption process experiences an initial rapid and a subsequent slow uptake stages. Moreover, the adsorption of quinoline on coal fly ash complies with the pseudo-second-order kinetics, and the adsorption isotherm is well described by the Langmuir adsorption model.

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“…Coal gasification technology is used worldwide (Ji et al, 2016;Shoko et al, 2006). However, with coal gasification wastewater (CGW) it can be difficult meet the discharging standard, because of complex components within the wastewater.…”

Section: Introductionmentioning

confidence: 99%

Shortcut Biological Nitrogen Removal from Coal Gasification Wastewater in Three‐Stage MBBRs

Han

2018

Water Environment Research

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A lab-scale aerobic-anoxic-aerobic (A E1 -A N -A E2 ) MBBR system was tested for the removal of COD, NH þ 4 -N, SCN -, phenols, and nitrogen from coal gasification wastewater, using a shortcut biological nitrogen removal process. Dissolved oxygen concentration in A E1 was maintained at 1.0 to 2.0 mg/L to ensure stable NO À 2 -N accumulation. Adding methanol wastewater to A N guaranteed denitrification efficiency. A E2 ensured high removal rates of NH þ 4 -N, SCN -, and phenols. The effects of influent pollutant concentration and hydraulic retention time (HRT) on nitrogen removal were studied. Improving the dissolved oxygen concentration in A E1 eliminated the negative effect of increased organic loading on nitrification, but it affected the stability of nitrosation. Shortening the HRT had negative effects on the performance of the system and performance recovered after it was extended. The average total nitrogen removal rate was 82.6% with a COD methanol /NO À x -N ratio of 3.5. Biomass and activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria were measured to understand the evolution of nitrification. Water Environ. Res., 90, 1977Res., 90, (2018.

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A review on the coal gasification wastewater treatment technologies: past, present and future outlook

Cited by 203 publications

References 81 publications

Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

Preparation, Performances, and Mechanisms of Microbial Flocculants for Wastewater Treatment

Intrinsic adsorption properties of raw coal fly ash for quinoline from aqueous solution: kinetic and equilibrium studies

Shortcut Biological Nitrogen Removal from Coal Gasification Wastewater in Three‐Stage MBBRs

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