Anodic oxidation of coke oven wastewater: Multiparameter optimization for simultaneous removal of cyanide, COD and phenol

The integrated steel industry is considered as one of the important industrial sectors, and its outputs are inputs for other sectors including construction, engineering, medical and scientific equipment, and defence. Massive production, consumption, and export of steel signify a country's economic index. This review outlines the World's steel production quantities, the processes involved, and wastewater generation from the industry and its treatment. Wastewater generated from steel plants is highly complex and requires intensive treatment before discharge into natural water bodies. Technologies adopted for treating wastewater generated from steel industries are deliberated, focusing on coking wastewater treatment. Microbial mediated processes provide an effective means of degrading the contaminants, but the toxicity of certain compounds during higher pollutant load inhibits its further treatment. However, these processes can be integrated with either electrochemical technologies or advanced oxidation processes (AOPs), which can reduce the toxicity level. Hence, when a highly concentrated and complex mixture of contaminants is considered, an integrated approach is a resourceful option in terms of cost‐effectiveness and treatment efficiency.

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“…The optimum conditions were found as 6.7 mA cm −‐2 , initial pH range of 6—8, and NaCl concentration of 1.31 g L −1 . [ 91 ]…”

Section: Wastewater Treatment Methodsmentioning

confidence: 99%

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

Kumar

Gopinath

Ranjith

et al. 2022

CLEAN Soil Air Water

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“…The coupling of Fenton's reagent with other methods in the form of photo-Fenton, electro-Fenton, sono-Fenton, and heterogeneous Fenton processes overcomes the limitations and improves its feasibility. Electrochemical oxidation is one of those technologies which have proved to be an emerging and promising alternative for wastewater treatment in recent decades (Sasidharan Pillai & Gupta 2016;He et al 2013;Wang et al 2015a). They are considered more advantageous than other oxidation processes because of several factors such as smaller footprint, absence of secondary waste generation, mild operating conditions, free of chemicals, and versatility to combine with other treatment techniques.…”

Section: Highlights From Previous Reviews On Wastewater Treatmentmentioning

confidence: 99%

“…The coking wastewater must be pretreated followed by biological treatment and if the biologically pretreated wastewater still contains refractory substances, advance treatment can be done to bring the wastewater under safety discharge standards. Many advanced oxidation treatment techniques (He et al 2013;Sasidharan Pillai & Gupta 2016;Sharma & Philip 2016;Zhang et al 2018) have been investigated to check their potential in terms of coking wastewater treatment. Wei et al (2015) applied the ozone/Fenton process for treating coking wastewater and observed that the process was highly effective in degradation of phenol, aniline, quinoline, and ammonia in coking wastewater.…”

Section: Advanced Oxidation Processesmentioning

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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“…According to the place of generation, coking plant effluents can be divided into tar, gas cooling, benzol recovery, rectification, and tar processing. The primary chemical pollutants of coke oven effluents, apart from phenols, are organic compounds conventionally referred to as COD (chemical oxygen demand), ammonia, sulfides, and cyanides [5][6][7]. Their origin is mainly the installation of cooling and condensation of raw coke-oven gas leaving the coke-oven chambers.…”

Section: Introductionmentioning

confidence: 99%

Low- and High-Pressure Membrane Separation in the Production of Process Water for Coke Quenching

2021

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Although the time for operating mines and coking plants in many countries is coming to an end due to climate change, we must still ensure that the pollution generated by this source of the economy is minimized. Despite the several stages of treatment of the coke-oven effluent, completed with nitrification and denitrification processes preceding final sedimentation, the stream obtained does not meet the requirements of water for coke quenching. That is why the stream after biodegradation and sedimentation was treated on membrane units to ensure water reusing in the coking plant. As the subjected stream contained both solid and dissolved pollutants, a two-stage system was proposed: low- and high-pressure membrane filtration. Industrial modules were tested on pilot units operating under industrial plant conditions. In the case of the ultrafiltration process, all the tested ultrafiltration modules fulfilled the primary task. All of them separated almost completely the turbidities present in the stream, which would have disturbed the operation of the high-pressure plant. Considering the decrease in permeate flux and the possibility of cleaning, a PCI membrane made of PVDF tubes with a diameter of 12.5 mm and pore size of 20 μm was selected. Regarding the high-pressure membrane filtration, the reverse osmosis membrane was significantly better in the removal efficiency of both organic and inorganic dissolved substances. An operating pressure of 3 MPa was chosen for the system. Hence, membrane processes, which are not used as stand-alone treatment units for coke-oven effluents, function well as a final treatment stage.

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Anodic oxidation of coke oven wastewater: Multiparameter optimization for simultaneous removal of cyanide, COD and phenol

Cited by 57 publications

References 27 publications

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

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

Low- and High-Pressure Membrane Separation in the Production of Process Water for Coke Quenching

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