Development of a novel integrated membrane system incorporated with an activated coke adsorption unit for advanced coal gasification wastewater treatment

Xu, Lili; Wang, Jun; Zhang, Mengjie; Hou, Deyin; Yu, Hanry

doi:10.1016/j.colsurfa.2015.07.062

Cited by 27 publications

(8 citation statements)

References 32 publications

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“…Most studies of gasification wastewater quality conducted in recent years have focused on its quality. e LCGW treatment process has been widely investigated, but these studies have investigated the COD, TOC, BOD 5 , and other simple indicators, which showed that gasification wastewater was characterized by high levels of organic pollutants, low biodegradability, and high toxicity [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Wang

Zhang

Jiang

et al. 2018

Journal of Chemistry

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e effluent of distilled and extracted Lurgi coal gasification wastewater has been found to have low biodegradability and high toxicity, which inhibits further biodegradation. However, ozonation enhances the biodegradability and reduces the toxicity of this effluent, enabling further biological treatment and increased removal of organic materials. In this study, the dissolved organic matters in Lurgi coal gasification wastewater were isolated into six classes by resin adsorbents, after which TOC, UV 254 , UV-Vis, and 3D EEM were employed to quantitatively and qualitatively analyze organic materials in each part of the fractionated samples.e HoA and HiN fraction accounted for large amounts of the Lurgi coal gasification wastewater, and their TOC values were about 380.21 mg·L −1 and 646.84 mg·L −1 , respectively. After ozonation, the TOC removal rates of HoA and HiN reached 42.85% and 67.13%, respectively. e UV 254 of HoA was basically stable before and after ozonation, while that of HiN increased continuously because a portion of the humic macromolecular organic materials in HoA was oxidized to HiN. Additionally, UV-Vis analysis revealed that the larger molecular organics of HoA were oxidized during ozonation, resulting in high biodegradability. Finally, the 3D EEM spectra indicated that the macromolecular organics were oxidized to smaller molecules with the degradation of soluble microbial by-products.

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Section: Introductionmentioning

confidence: 99%

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Wang

Zhang

Jiang

et al. 2018

Journal of Chemistry

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“…In this regard, low‐cost lignite activated coke has received attention as a better adsorbent than activated carbon, because it normally presents with relatively higher mechanical strength. It can also be disposed of harmlessly by blending with coke in the iron ore sintering process …”

Section: Introductionmentioning

confidence: 99%

“…It can also be disposed of harmlessly by blending with coke in the iron ore sintering process. 10 Previous studies attributed the higher adsorption capacity of activated coke to the large number of macro and mesopores, indicating that pore structure is a key factor in adsorption. 11,12 Conversely, Zhang et al considered that the dissolved organic matter (DOM) adsorption by activated coke would be a chemical adsorption rather than physical.…”

Section: Introductionmentioning

confidence: 99%

Factors controlling adsorption of recalcitrant organic contaminant from bio‐treated coking wastewater using lignite activated coke and coal tar‐derived activated carbon

Zhang

Chen

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: Low-cost coal-based carbonaceous material has attracted special attention for removal of organics from industrial wastewaters. In this study, coal tar-derived activated carbon (AC1) and lignite activated coke (AC2) were employed to identify the fundamental factors that facilitate the selection of suitable adsorbents for removing recalcitrant organic contaminant (ROC) from bio-treated coking wastewater (BTCW).

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“…In these processes, coagulation-flocculation is an important unit operation with the advantage of low cost and simple operation. 3,[12][13][14][15][16][17][18] The core of coagulation-flocculation is the chemical reagent used and different aluminum, iron based coagulants and organic flocculants have been developed for wastewater treatment. [16][17][18] Due to the superior coagulation performance composite coagulants have received widespread attention and have developed rapidly during the past decades.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and optimization of a novel poly‐silicic metal coagulant from coal gangue for tertiary‐treatment of coking wastewater

Liu

Wang

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Bio‐treated coking wastewater is difficult to treat further, mainly due to the bio‐refractory organic content. Coal gangue is the largest solid waste in China and it contains large amounts of aluminum, iron and silicon. This study attempts to recover the waste in coal gangue as a novel poly‐silicic metal coagulant for bio‐treated coking wastewater treatment. RESULTS The poly‐silicic metal coagulant was synthesized from coal gangue under different conditions. Fourier transform infrared spectroscopy, X‐ray diffraction and scanning electron microscopy confirmed that both amorphous and crystalline phases were present in the samples and new chemical bonds such as Si–O–Al and Si–O–Fe were formed. The results show that the composite coagulant was effective for organic removal from the bio‐treated coking wastewater and the optimal Al/Fe/Si molar ratios were Al/Fe = 3 and (Al + Fe)/Si = 13. The removal of organics exhibits a parabolic curve as the coagulant dosage increases. However, the optimal dosage (125 mg L‐1) for organic removal was not equal to the isoelectric point (100 mg L‐1). Furthermore, SEM images showed that the flocs start to disintegrate at a dosage of 150 mg L‐1, leading to deteriorating sludge settling. CONCLUSIONS It is feasible to fabricate poly‐silicic metal coagulants for coking wastewater treatment by using coal gangue as the raw material. The removal of the bio‐refractory organics by the composite coagulant was attributed to the combined effects of charge neutralization, bridge adsorption and the net capturing. © 2017 Society of Chemical Industry

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Development of a novel integrated membrane system incorporated with an activated coke adsorption unit for advanced coal gasification wastewater treatment

Cited by 27 publications

References 32 publications

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Factors controlling adsorption of recalcitrant organic contaminant from bio‐treated coking wastewater using lignite activated coke and coal tar‐derived activated carbon

Synthesis and optimization of a novel poly‐silicic metal coagulant from coal gangue for tertiary‐treatment of coking wastewater

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