Treatment of coking wastewater using oxic-anoxic-oxic process followed by coagulation and ozonation

Wang, Jianbing; Ji, Yuxian; Zhang, Fengyuan; Wang, Dongliang; He, Xuwen; Wang, Chunrong

doi:10.1016/j.crcon.2019.06.001

Cited by 30 publications

(6 citation statements)

References 30 publications

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“…2,21 Coking wastewater composition most certainly depends on the nature/quality of the coal and coke production process (technology level and people proficiency). 6,[22][23][24] Therefore, concentrations of pollutants in coking wastewater vary significantly from different coking plants. 9 Table 1 shows physicochemical and ecotoxi- 21 This is elaborated in more detail further herein.…”

Section: Coking Wastewater Compositionmentioning

confidence: 99%

“…For each mole of SCN − degraded, 0.24-0.26 mol of NH 4 + -N are produced. 3,24,25,36,38 Wu et al 10 proved that pH values from 6.12 ± 0.07 to 7.03 ± 0.12 are more favourable for the growth of thiocyanate-degrading bacteria than pH values from 7.00 ± 0.05 to 9.05 ± 0.11. The main thiocyanate-degrading bacteria is Thiobacillus.…”

Section: Thiocyanatesmentioning

confidence: 99%

“…6 Yet, possible solution to this problem is aerobic reactor before anoxic/oxic (A/O) biological treatment. 24 However, ammonia removal is a key process in coking wastewater treatment. 38 Kim, 14 discovered that Nitrosomonas europaea and Nitrosomonas nitrosa are the dominant ammonia oxidising bacteria.…”

Section: Ammoniamentioning

confidence: 99%

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An Overview of Coking Wastewater Characteristics and Treatment Technologies

Tutić¹,

Miloloža

Cvetnić

et al. 2023

Kemija U Industriji

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Coke is a high-calorie carbon mass obtained by dry distillation of coal, and used in various processes, the most significant of which is production of iron and steel. Coke production is present worldwide, especially in recent years when due to economic growth the global demand for steel is growing, which consequently increases demand for coke. During coke production, enormous amounts of toxic wastewater of extremely complex composition are generated. Priority pollutants that coking wastewater contains are phenols, cyanides, and thiocyanates. For successful treatment of such wastewater and achieving safety discharge standards, the application of a single process is insufficient. Accordingly, a combination of different physicochemical and biological treatment procedures, of which biological treatment is the most important, should be applied. In this article, a literature review of coking wastewater characteristics and treatment technologies is presented. In addition, this review addresses the complexity and limitations associated with coking wastewater treatment, with special emphasis on biological treatment methods. The aim of this review was to summarise the current knowledge on coking wastewater treatment technologies, which could eventually help optimisation of existing solutions.

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Section: Coking Wastewater Compositionmentioning

confidence: 99%

Section: Thiocyanatesmentioning

confidence: 99%

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An Overview of Coking Wastewater Characteristics and Treatment Technologies

Tutić¹,

Miloloža

Cvetnić

et al. 2023

Kemija U Industriji

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“…Dyes are refractory pollutants and are treated using advanced treatment technologies (Asghar et al, 2020;Bello et al, 2020;Bahadur & Bhargava, 2019 ;Asghar, Raman, et al, 2017) such as fenton oxidation (Asghar, Abdul Raman, et al, 2017), ozonation (Wang et al, 2019), ultrasound (Asghar et al, 2020), electrochemical oxidation-reduction (Cortés et al, 2007), indirect electro-oxidation using strong oxidants (Liu et al, 2019), electrocoagulation (EC) (Huda et al, 2017), and advanced oxidation processes (AOPs). AOPs show higher efficiency, however, result in high chemical consumption (Buthiyappan & Raman, 2019) and limit their wide applications (Khandegar & Saroha, 2013).…”

Section: Introductionmentioning

confidence: 99%

Treatment by Electrocoagulation of Congo red from Aqueous Solution Using Cantor Alloy

Akkaya¹,

Polat²

2022

European Journal of Science and Technology

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Electrocoagulation (EC) is one of the most effective techniques in removing color and organic pollutants from wastewater. This study aims to use a new alloy system, so-called High Entropy Alloys (HEAs), which contains at least five principal elements with 5-35 at. %, as an electrode in the EC process. The well-studied equiatomic CrMnFeCoNi HEA (Cantor alloy) was used as an anode in the treatment of the synthetically prepared wastewater (congo red solution) with EC. In the EC study, COD and color removal were evaluated at different current densities (5-100 mA/cm2) for 15 min electrolysis period. The results showed that removal efficiency of above 80 % was obtained for both parameters of COD and color at the lowest current density of 5 mA/cm 2 . The optimum current density was determined to be 10 mA/cm 2 , and the COD and color removal efficiencies were found to be 84 and 99.4 %, respectively. It was shown that the Cantor alloy possesses an effective removal in the EC process.

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“…For the last decade, most of the research works have been oriented towards effective treatment of coking wastewater with proper integration of biological treatment with advanced treatment techniques (Liu et al 2016;Kumar et al 2017;Xue et al 2017;Wang et al 2019). Investigation towards enhancing the biodegradability of coking wastewater has also been in the limelight of research (Duan et al 2015;Yu et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Advances in treatment of coking wastewater – a state of art review

Tamang

Paul

2021

Water Science and Technology

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Coking wastewater poses a serious threat to the environment due to the presence of a wide spectrum of refractory substances such as phenolic compounds, polycyclic aromatic hydrocarbons and heterocyclic nitrogenous compounds. These toxic substances are difficult to treat using conventional treatment methods alone. In recent years much attention has been given to the effective treatment of coking wastewater. Thus, this review seeks to provide a brief overview of recent developments that have taken place in the treatment of coking wastewater. In addition, this article addresses the complexity and the problems associated with treatment followed by a discussion on biological methods with special focus on bioaugmentation. As coking wastewater is refractory in nature, some of the studies have been related to improving the biodegradability of wastewater. The final section focuses on the integrated treatment methods that have emerged as the best solution for tackling the highly unmanageable coking wastewater. Attention has also been given to emerging microwave technology which has tremendous potential for treatment of coking wastewater.

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Treatment of coking wastewater using oxic-anoxic-oxic process followed by coagulation and ozonation

Cited by 30 publications

References 30 publications

An Overview of Coking Wastewater Characteristics and Treatment Technologies

An Overview of Coking Wastewater Characteristics and Treatment Technologies

Treatment by Electrocoagulation of Congo red from Aqueous Solution Using Cantor Alloy

Advances in treatment of coking wastewater – a state of art review

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