The behaviors and fate of polycyclic aromatic hydrocarbons (PAHs) in a coking wastewater treatment plant

Zhang, Wanhui; Wei, Chaohai; Chai, Xin‐Sheng; He, Jingying; Cai, Ying; Ren, Man; Yan, Bo; Peng, Ping’an; Fu, Jiamo

doi:10.1016/j.chemosphere.2012.02.076

Cited by 144 publications

(61 citation statements)

References 34 publications

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“…In the biological effluent, 73 weakly polar compounds were found, and the chromatogram was dominated by one Nheteroatomic compound, 4-azafluorine (MW,167). This indicated that most of the PAHs were removed in the biological unit, with possible mechanisms of chemical transformation, biodegradation, and adsorption to sludge (Shiaris 1989;Sigman et al 1998;Heidler et al 2006;Zhang et al 2012). Similar to that for the biological effluent, the final effluent chromatogram was still dominated by 4-azafluorene (MW, 167), and 69 weakly polar compounds were still present.…”

Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 56%

“…Among these available studies, the focuses were mainly on the quantification of 16 PAHs in the wastewater, not including the distribution of these compounds in coke production. It has become increasingly evident in recent years that hundreds of PAHs between naphthalene (molecular weight (MW), 128) and coronene (MW,302) are present in environmental matrices (Barron and Holder 2003;Zhang et al 2012). Thus, analysis of just 16 PAHs in coking wastewater may be inadequate for comprehensive identification of PAH sources and characterization of PAH removal.…”

Section: Responsible Editor: Leif Kronbergmentioning

confidence: 99%

“…For example, biological wastewater treatment facilities are designed for optimal biotransformation activity by providing high density of active microorganisms and a variety of carbon, nutrient, and energy sources to promote cometabolism of recalcitrant pollutants (Heidler et al 2006). Combination of anoxic, oxic, and hydrolytic zones favors anaerobic and aerobic metabolisms (Zhang et al 2012). A better understanding of the removal of PAHs during wastewater treatment process will be helpful to optimize the WWTPs for minimizing the amount of PAHs discharged to the environment.…”

Section: Responsible Editor: Leif Kronbergmentioning

confidence: 99%

“…In removal processes, pollutants would undergo separation, air stripping, transformation, and adsorption (Zhang et al 2012), and the amounts and concentration were reduced after these treatment processes. In the coking WWTP, the amounts and varieties were reduced from 358 in the coking wastewater (influent) to 69 in the final effluent ( Table 2).…”

Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 99%

“…This indicated little change in water quality at the pretreatment stage. In this stage, volatilization and separation from tar were expected to allow removal of low MW and high MW PAHs, respectively (Zhang et al 2012). In the biological effluent, 73 weakly polar compounds were found, and the chromatogram was dominated by one Nheteroatomic compound, 4-azafluorine (MW,167).…”

Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 99%

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Identification and removal of polycyclic aromatic hydrocarbons in wastewater treatment processes from coke production plants

Zhang

Wei

Yan

et al. 2013

Environ Sci Pollut Res

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Identification and removal of polycyclic aromatic hydrocarbons (PAHs) were investigated at two coke plants located in Shaoguan, Guangdong Province of China. Samples of raw coking wastewaters and wastewaters from subunits of a coke production plant were analyzed using gas chromatography-mass spectrometry (GC/MS) to provide a detailed chemical characterization of PAHs. The identification and characterization of PAH isomers was based on a positive match of mass spectral data of sample peaks with those for PAH isomers in mass spectra databases with electron impact ionization mass spectra and retention times of internal reference compounds. In total, 270 PAH compounds including numerous nitrogen, oxygen, and sulfur heteroatomic derivatives were positively identified for the first time. Quantitative analysis of target PAHs revealed that total PAH concentrations in coking wastewaters were in the range of 98.5±8.9 to 216±20.2 μg/L, with 3-4-ring PAHs as dominant compounds. Calculation of daily PAH output from four plant subunits indicated that PAHs in the coking wastewater came mainly from ammonia stripping wastewater.Coking wastewater treatment processes played an important role in removing PAHs in coking wastewater, successfully removing 92 % of the target compounds. However, 69 weakly polar compounds, including PAH isomers, were still discharged in the final effluent, producing 8.8±2.7 to 31.9±6.8 g/day of PAHs with potential toxicity to environmental waters. The study of coking wastewater herein proposed can be used to better predict improvement of coke production facilities and treatment conditions according to the identification and removal of PAHs in the coke plant as well as to assess risks associated with continuous discharge of these contaminants to receiving waters.

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Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 56%

Section: Responsible Editor: Leif Kronbergmentioning

confidence: 99%

Section: Responsible Editor: Leif Kronbergmentioning

confidence: 99%

Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 99%

Section: Removal Of Pahs During Wastewater Treatment Processesmentioning

confidence: 99%

See 3 more Smart Citations

Identification and removal of polycyclic aromatic hydrocarbons in wastewater treatment processes from coke production plants

Zhang

Wei

Yan

et al. 2013

Environ Sci Pollut Res

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Potential and Limits of Biodegradation Processes for the Removal of Organic Xenobiotics from Wastewaters

Dionisi

2014

ChemBioEng Reviews

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In the removal of organic xenobiotics from wastewaters, biodegradation is an interesting alternative to conventional physical and chemical processes. Biodegradation in biological wastewater treatment plants has the potential advantages of removing the xenobiotics from the environment, transforming them into nontoxic products such as carbon dioxide and new biomass, and being relatively low in cost. Many xenobiotics have been found to be biodegradable as sole carbon and energy source under aerobic conditions, while under anaerobic conditions many chlorinated hydrocarbons can be biodegraded by reductive dechlorination processes. The main limits of biodegradation processes are the limited time for adaptation to the xenobiotics, the very low xenobiotics concentration in the influent, the competition with abiotic removal mechanisms, the limited availability of external substrates for cometabolism, and the intrinsic nonbiodegradability. Existing biological wastewater treatment processes can be modified by using higher values of the solids retention time, bioaugmentation, addition of readily biodegradable substrates to support cometabolism, and the use of anaerobic‐aerobic processes.

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Ammonium removal from coking wastewater in a pilot‐scale two‐stage aerobic biofilm system: Biokinetic analysis

Zhou

Zhang

2016

Can J Chem Eng

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A novel four‐stage pilot‐scale anaerobic/anoxic/oxic/oxic (A2/O2) biofilm process was successfully developed to treat coking wastewater with high ammonium loading. In this study, three different dynamical models including the first‐order substrate removal model, the Monod‐biological contact oxidation (Monod‐BCO) model, and the modified Stover‐Kincannon model were particularly applied to analyze kinetics of ammonium removal in a two‐step aerobic stage. For the O1 reactor, all models were appropriate for describing ammonium removal and the correlation coefficients of first‐order substrate removal model, BCO model, and modified Stover‐Kincannon model were 0.8974, 0.9210, and 0.9726, respectively. The model verification indicated that the modified Stover‐Kincannon model was slightly more applicable to predict ammonium removal in the O1 reactor. It was demonstrated that the maximum removal rate of ammonium was 0.208 kg/(m3 · d) by the Stover‐Kincannon model. For the O2 reactor, the modified Stover‐Kincannon model turned out to be the best fitting kinetic model for ammonium removal compared to the first‐order substrate removal model (R2 = 0.1556) and Monod‐BCO model (R2 = 0.5022). The maximum ammonium conversion rate (Um2‐O2) by the modified Stover‐Kincannon model was 1.180 kg/(m3 · d), while saturation rate constant k3‐O2 was 1.221 kg/(m3 · d). Furthermore, the determination coefficient between measured and predicted values obtained by the modified Stover‐Kincannon model was quite high (R2 = 0.9788) in the O2 process and a lower average residual square (6.60 × 10−6) was also obtained. The results of kinetic studies by the Stover‐Kincannon model can predict ammonia removal efficiency well in two‐step aerobic biofilm reactors of a coking wastewater treatment combined system.

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The behaviors and fate of polycyclic aromatic hydrocarbons (PAHs) in a coking wastewater treatment plant

Cited by 144 publications

References 34 publications

Identification and removal of polycyclic aromatic hydrocarbons in wastewater treatment processes from coke production plants

Identification and removal of polycyclic aromatic hydrocarbons in wastewater treatment processes from coke production plants

Potential and Limits of Biodegradation Processes for the Removal of Organic Xenobiotics from Wastewaters

Ammonium removal from coking wastewater in a pilot‐scale two‐stage aerobic biofilm system: Biokinetic analysis

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