The effect of treatment stages on the coking wastewater hazardous compounds and their toxicity

Xiaoxue, Wei; Zhang, Ziyang; Fan, Qing-lan; Xu, Yuan; Guo, Dong‐Sheng

doi:10.1016/j.jhazmat.2012.08.042

Cited by 86 publications

(31 citation statements)

References 4 publications

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“…Due to its reduced energy consumption, enhanced hydrolysis of organics, and detoxification of toxic compounds (Chakraborty and Veeramani 2002), anaerobic digestion is often used before an aerobic reactor for the treatment of high strength industrial wastewater (Wei et al 2012), including the treatment of CWW or coal gasification wastewater Zhu et al 2013Zhu et al , 2016. However, although the efficiency of pollutant removal (such as of phenols) is low in many cases (Zhu et al 2016), methane production appears to be limited under mesophilic conditions .…”

Section: Introductionmentioning

confidence: 99%

Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater

Joshi

Zhang

Tian

et al. 2016

Appl Microbiol Biotechnol

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The combined anaerobic-aerobic biosystem is assumed to consume less energy for the treatment of high strength industrial wastewater. In this study, pollutant removal performance and microbial diversity were assessed in a longterm (over 300 days) bench-scale sequential anaerobicaerobic bioreactor treating coking wastewater. Anaerobic treatment removed one third of the chemical oxygen demand (COD) and more than half of the phenols with hydraulic retention time (HRT) of 42 h, while the combined system with total HRT of 114 h removed 81.8, 85.6, 99.9, 98.2, and 85.4 % of COD, total organic carbon (TOC), total phenols, thiocyanate, and cyanide, respectively. Two-dimensional gas chromatography with time-of-flight mass spectrometry showed complete removal of phenol derivatives and nitrogenous heterocyclic compounds (NHCs) via the combined system, with the anaerobic process alone contributing 58.4 and 58.6 % removal on average, respectively. Microbial activity in the bioreactors was examined by 454 pyrosequencing of the bacterial, archaeal, and fungal communities. Proteobacteria (61.2-93.4 %), particularly Betaproteobacteria (34.4-70.1 %), was the dominant bacterial group. Ottowia (14.1-46.7 %), Soehngenia (3.0-8.2 %), and Corynebacterium (0.9-12.0 %), which are comprised of phenol-degrading and hydrolytic bacteria, were the most abundant genera in the anaerobic sludge, whereas Thiobacillus (6.6-43.6 %), Diaphorobacter (5.1-13.0 %), and Comamonas (0.2-11.1 %) were the major degraders of phenol, thiocyanate, and NHCs in the aerobic sludge. Despite the low density of fungi, phenol degrading oleaginous yeast Trichosporon was abundant in the aerobic sludge. This study demonstrated the feasibility and optimization of less energy intensive treatment and the potential association between abundant bacterial groups and biodegradation of key pollutants in coking wastewater.

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Section: Introductionmentioning

confidence: 99%

Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater

Joshi

Zhang

Tian

et al. 2016

Appl Microbiol Biotechnol

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“…1) Coke yield of China reached 335.5 million tons in 2007, 2) 355 million tons in 2009, and 480 million tons in 2013. During the process of coke production, coking wastewater is generated from the high-temperature carbonization of coal, gas purification, and by-product recovery and refining, [3][4][5] and its discharge volume is about 2.85 × 10 8 m 3 per year. [6][7][8] As a typical industrial wastewater, the composition of coking wastewater is very complex, with the characteristics of high toxicity and difficult biodegradation, 4) in which the organic pollutants mainly include N-heterocyclic compounds (NHCs) and polycyclic aromatic hydrocarbons.…”

mentioning

confidence: 99%

“…[6][7][8] As a typical industrial wastewater, the composition of coking wastewater is very complex, with the characteristics of high toxicity and difficult biodegradation, 4) in which the organic pollutants mainly include N-heterocyclic compounds (NHCs) and polycyclic aromatic hydrocarbons. 3,5,8) Biological treatment technologies, such as anoxicoxic (A-O), anaerobic-anoxic-oxic (A 1 -A 2 -O), anaerobic-oxic-oxic (A 1 -O 1 -O 2 ), 9) and sequencing batch reactor (SBR), are usually used for coking wastewater treatment. 4) However, the effluent quality of the coking wastewater treated by the above biochemical processes, especially COD, due to high levels of refractory organics such as quinoline, phenol, benzene, pyridine, and indole, 4) usually cannot meet stringent effluent standards in China.…”

mentioning

confidence: 99%

Biodegradation characterization and immobilized strains’ potential for quinoline degradation by Brevundimonas sp. K4 isolated from activated sludge of coking wastewater

Wang

Zhang

Cheng

et al. 2015

Bioscience, Biotechnology, and Biochemistry

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“…Considering the backflow from the MBR effluent to A2 reactor and the similarity of A1 and A2 reactors, it can be inferred that toxic units were mainly removed by the MBR stage. Thus, aerobic MBR was the key stage for removal of acute toxicity as well as DOC and NH 3 -N in the coking wastewater treatment (Wei et al 2012). Residual acute toxicity in the biologically treated effluents was probably due to the toxic compounds which are difficult to degrade by activated sludge microorganisms.…”

Section: Removal Of Acute Toxicity By Biological Treatment Processmentioning

confidence: 99%

Acute toxicity and chemical evaluation of coking wastewater under biological and advanced physicochemical treatment processes

Liu

Zhu

et al. 2016

Environ Sci Pollut Res

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This study investigated the changes of toxic compounds in coking wastewater with biological treatment (anaerobic reactor, anoxic reactor and aerobic-membrane bioreactor, A1/A2/O-MBR) and advanced physicochemical treatment (Fenton oxidation and activated carbon adsorption) stages. As the biological treatment stages preceding, the inhibition effect of coking wastewater on the luminescence of Vibrio qinghaiensis sp. Nov. Q67 decreased. Toxic units (TU) of coking wastewater were removed by A1/A2/O-MBR treatment process, however approximately 30 % TU remained in the biologically treated effluent. There is a tendency that fewer and fewer residual organic compounds could exert equal acute toxicity during the biological treatment stages. Activated carbon adsorption further removed toxic pollutants of biologically treated effluent but the Fenton effluent increased acute toxicity. The composition of coking wastewater during the treatment was evaluated using the three-dimensional fluorescence spectra, gas chromatography-mass spectrometry (GC-MS). The organic compounds with high polarity were the main cause of acute toxicity in the coking wastewater. Aromatic protein-like matters in the coking wastewater with low biodegradability and high toxicity contributed mostly to the remaining acute toxicity of the biologically treated effluents. Chlorine generated from the oxidation process was responsible for the acute toxicity increase after Fenton oxidation. Therefore, the incorporation of appropriate advanced physicochemical treatment process, e.g., activated carbon adsorption, should be implemented following biological treatment processes to meet the stricter discharge standards and be safer to the environment.

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The effect of treatment stages on the coking wastewater hazardous compounds and their toxicity

Cited by 86 publications

References 4 publications

Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater

Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater

Biodegradation characterization and immobilized strains’ potential for quinoline degradation by Brevundimonas sp. K4 isolated from activated sludge of coking wastewater

Acute toxicity and chemical evaluation of coking wastewater under biological and advanced physicochemical treatment processes

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