Efficient advanced treatment of coking wastewater using O3/H2O2/Fe-shavings process

Yuan, Run; Xia, Yu; Wu, Xu; He, Can; Qin, Yihe; He, Changjun; Zhang, Xuewei; Li, Na; He, Xuwen

doi:10.1016/j.jece.2022.107307

Cited by 17 publications

(5 citation statements)

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“…ANOVA analysis was employed to analyze the significance and adequacy of the experimental data (Table 1) [11]. F value and p value were 17.451 and 0.0005, respectively, indicating that aforementioned model was statistically significant [67].…”

Section: Disposal Of Coking Wastewater By α-Mno 2 /Pms Processmentioning

confidence: 99%

“…Coking water contains organic contaminants involving phenols, pyrrole, furan, naphthalene, polycyclic aromatic hydrocarbon and other refractory components [9,10]. China issued a strict discharge standard for coking wastewater (GB 16171-2012) [11]. Treatment of coking wastewater has become more and more sophisticated, evolving from simple mechanical approaches prevalent during the 1950s to 1960s to the boom of biochemical technology during the 1980s to 1990s [12].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, manganese oxide ore acidic oxidation was employed to efficiently degrade the organic contaminants in coking wastewater [20]. In another study, a process of O 3 /H 2 O 2 /Fe-shavings, which coupled catalytic ozonation and Fenton-like oxidation with Fe-shaving wastes reused, demonstrated high efficiency in the treatment of coking wastewater secondary biochemical effluent [11]. Unfortunately, due to the strong quenching effects of impurities on ROS, especially free radicals, huge amounts of reaction reagents and power were consumed to achieve high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Even worse, the disposal performance was not that stable due to the variable physicochemical properties of coking wastewater. Inorganic pollutants including sulfate, chlorides, cyanides and nitrides are widely dispersed in coking wastewater [11]. In addition, coking wastewater is characterized by its high alkalinity and hardness [14].…”

Section: Introductionmentioning

confidence: 99%

“…In our research hypothesis, refractory contaminants would be highly-efficiently degraded via non-radical pathways, with low dosages of reaction reagents and negligible influences from impurities in wastewater. Inspired by the advantage of quickly analyzing the interactions between multiple parameters, optimizing and predicting the experimental parameters with a low number of experiments, the response surface method (RSM) was employed to optimize the reaction conditions of the α-MnO 2 /PMS process [11,13]. Due to the fact that phenols were reported to account for more than 80% of the total COD in coking wastewater [14], we chose phenol as the model compound to uncover the mechanism of our system to degrade organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of Coking Wastewater by α-MnO2/Peroxymonosulfate Process via Direct Electron Transfer Mechanism

et al. 2022

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Side reactions between free radicals and impurities decelerate the catalytic degradation of organic contaminants from coking wastewater by Advanced Oxidation Processes (AOPs). Herein, we report the disposal of coking wastewater by α-MnO2/PMS process via a direct electron transfer mechanism in this study. By the removal assays of the target compound of phenol, the PMS mediated electron transfer mechanism was identified as the dominated one. Water quality parameters including initial pH, common anions and natural organic matters demonstrated limited influences on phenol degradation. Afterwards, α-MnO2/PMS process was applied on the disposal of coking wastewater. The treatment not only eliminated organic contaminants with COD removal of 73.8% but also enhanced BOD5/COD from 0.172 to 0.419, within 180 min of reaction under conditions of 50 g/L α-MnO2, 50 mM PMS and pH0 7.0. COD removal decreased only 1.1% after five-time cycle application, suggesting a good reuse performance. A quadratic polynomial regression model was further built to optimize the reaction conditions. By the model, the dosage of α-MnO2 was identified as the most important parameters to enhance the performance. The optimal reaction conditions were calculated as 50 g/L α-MnO2, 50 mM PMS and pH0 6.5, under which COD removal of 74.6% was predicted. All aforementioned results suggested that the α-MnO2/PMS process is a promising catalytic oxidation technology for the disposal of coking wastewater with good practical potentials.

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Section: Disposal Of Coking Wastewater By α-Mno 2 /Pms Processmentioning

confidence: 99%