Water consumption and wastewater discharge in China’s steel industry

Tong, Yongjuan; Zhang, Qi; Cai, Jiuju; Gao, Chengkang; Wang, Lianyong; Li, Peng

doi:10.1080/03019233.2018.1538180

Cited by 26 publications

(19 citation statements)

References 54 publications

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“…Pretreatment technology is generally selected in accord with the treated object [9]. Common methods for removing suspended matter and oil substances include oil separation/precipitation, air floatation, and coagulation sedimentation methods [10]. Ozone-based processes do not always lead to a complete mineralization of compounds [11].…”

Section: Introductionmentioning

confidence: 99%

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Chen

Sun

2019

IJERPH

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In this study, coagulation, ozone (O3) catalytic oxidation, and their combined process were used to pretreat actual coking wastewater. The effects on the removal of chemical oxygen demand (COD) and phenol in coking wastewater were investigated. Results showed that the optimum reaction conditions were an O3 mass flow rate of 4.1 mg min−1, a reaction temperature of 35 °C, a catalyst dosage ratio of 5:1, and a O3 dosage of 500 mg·L−1. The phenol removal ratio was 36.8% for the coagulation and sedimentation of coking wastewater under optimal conditions of 25 °C of reaction temperature, 7.5 reaction pH, 150 reaction gradient (G) value, and 500 mg·L−1 coagulant dosage. The removal ratios of COD and phenol reached 24.06% and 2.18%, respectively. After the O3-catalyzed oxidation treatment, the phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds were degraded to varying degrees. Coagulation and O3 catalytic oxidation contributed to the removal of phenol and COD. The optimum reaction conditions for the combined process were as follows: O3 dosage of 500 mg·L−1, O3 mass flow of 4.1 mg·min−1, catalyst dosage ratio of 5:1, and reaction temperature of 35 °C. The removal ratios of phenol and COD reached 47.3% and 30.7%, respectively.

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Section: Introductionmentioning

confidence: 99%

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Chen

Sun

2019

IJERPH

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“…The values of the above order parameters were evaluated using Eq. (7)(8)(9)(10)(11)(12)(13)(14)(15). Most of the order parameters have a positive effect on promoting the orderly development of the calcination system, except for V 1,2 and V 2,1 .…”

Section: Synergy Model Evaluation Of the Calcination Processmentioning

confidence: 99%

“…From the perspective of thermodynamics, the calcination process of GPC in the rotary kiln is considered as an open, non-equilibrium, irreversible, nonlinear and complex system. Therefore, the detailed theory of material and energy flow analysis and synergy is crucial to improve the resource utilization and energy saving in manufacturing process [11,12]. Usually, researchers applied three sub-models to analysis the energy utilization of the system, including material and energy flows model [13,14], synergy model [15] and exergy analysis model [16].…”

Section: Introductionmentioning

confidence: 99%

A synergy model of material and energy flow analysis for the calcination process of green petroleum coke in rotary kiln

Peng

Liu

et al. 2022

THERM SCI

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The main objective of this paper is to establish a mathematical framework to analyze the complex material and energy performance of the calcinations process based on the fundamental mass and energy conservations. The synergy degree of vital order parameters was defined and evaluated to assess the status and order of the calcination process. Furthermore, the synergy model for resource utilization and energy saving has also been developed. The results show that the energy efficiencies of the drying kiln, rotary kiln, incinerator and the cooler are 63.574%, 37.709%, 76.782% and 74.758%, respectively. Meanwhile, the synergy degree of the whole calcination system is determined as 0.507. Based on the result, several suggestions were proposed to improve the resource utilization, energy-saving and synergy performance. Assessing the performance of suggested improvements, the synergy degree was re-evaluated and recorded a substantial enhancement up to 0.809. The present work provides valuable insights and comprehensive analysis tool for assessing the performance and potential optimization of the calcination process.

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“…The surface of the subsurface flow constructed wetland is covered with soil (5 cm thick). Reeds are planted on the soil with a density of around 50 plants/m 2 .…”

Section: Materials and Reactormentioning

confidence: 99%

“…The iron and steel industry is one of the pillar industries of China's national economic development, with its productivity ranking first steadily in the whole world in recent years [1,2]. In the steel production process, as great quantity of freshwater required and wastewater emitted, it's significant to improve water recycling for improving the sustainability of iron and steel industry.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Nitrogen Removal of Steel Rolling Wastewater by Constructed Wetland Combined with Sulfur Autotrophic Denitrification

Zheng

Lin

et al. 2021

Sustainability

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Constructed wetlands (CWs), an ecological treatment technology, is suitable for advanced treatment, but has an unsatisfying denitrification performance for steel rolling wastewater with low C/N ratio. This study combined sulfur autotrophic denitrification (SAD) with conventional constructed horizontal subsurface flow wetlands to treat steel rolling wastewater, exploring the feasibility of applying SAD to enhance the denitrification performance of CWs. The reactor consists of two sections, one filled with manganese sand and gravel (HFC) and another filled with ceramic, sulfur, and lime (HFSAD). Results showed that HFC had a good performance on removing turbidity, DO, COD, and TP, while the average removal efficiency of total nitrogen (TN) in HFC was just 25.6%. On this basis, HFSAD could remove 45.6% of TN subsequently, whose denitrification rate was 4–6 times as high as that of HFC. Increasing hydraulic retention time could improve removal efficiency of contaminants in HFC and HFSAD in different degrees. The analysis of microbial community structure, observation results of fillers and monitored sulfate all provided proofs for the occurrence of SAD. CWs combined with SAD can be applied in the treatment of steel rolling wastewater with low carbon, which can provide reference for ecological wastewater treatment, water saving, and recycling in iron and steel enterprises.

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Water consumption and wastewater discharge in China’s steel industry

Cited by 26 publications

References 54 publications

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

Combination of Coagulation and Ozone Catalytic Oxidation for Pretreating Coking Wastewater

A synergy model of material and energy flow analysis for the calcination process of green petroleum coke in rotary kiln

Enhanced Nitrogen Removal of Steel Rolling Wastewater by Constructed Wetland Combined with Sulfur Autotrophic Denitrification

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