Integrated process for zero discharge of coking wastewater: A hierarchical cycle-based innnovation

Ke, Xiong; Wei, Tuo; Wei, Gengrui; Chen, Acong; Cheng, Xiaoqian; Li, Zemin; Qin, Zhaohui; Pang, Zijun; Pan, Jiamin; Chen, Yao; Wei, Cong; Guan, Xianghong; He, Xuguang; Qiu, Guofu; Wu, Haixia; Wei, Chaohai

doi:10.1016/j.cej.2022.141257

Cited by 16 publications

(3 citation statements)

References 27 publications

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“…The EDS mapping further indicates that the saline water does not penetrate the hydrophobic region (Figure i). Importantly, the salt solutes can be collected from the concentrated saline water at the outlet through air drying, meeting the needs of ZLD (Figure j). − Additionally, after 8 h of operation, the water contact angles, microstructures, and salinity of SH-CP and Design-NWF were investigated in Figures S22–S24 of the Supporting Information, further demonstrating the excellent stability of Design-NWF and SH-CP.…”

Section: Resultsmentioning

confidence: 90%

Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection

Tian,

Jiang,

Zhu

et al. 2024

Environ. Sci. Technol.

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Interfacial solar vapor generation (ISVG) is an emerging technology to alleviate the global freshwater crisis. However, high-cost, low freshwater collection rate, and salt-blockage issues significantly hinder the practical application of solar-driven desalination devices based on ISVG. Herein, with a low-cost copper plate (CP), nonwoven fabric (NWF), and insulating ethylene–vinyl acetate foam (EVA foam), a multistage device is elaborately fabricated for highly efficient simultaneous freshwater and salt collection. In the designed solar-driven device, a superhydrophobic copper plate (SH-CP) serves as the condensation layer, facilitating rapid mass and heat transfer through dropwise condensation. Moreover, the hydrophilic NWF is designed with rational hydrophobic zones and specific high-salinity solution outlets (Design-NWF) to act as the water evaporation layer and facilitate directional salt collection. As a result, the multistage evaporator with eight stages exhibits a high water collection rate of 2.25 kg m–2 h–1 under 1 sun irradiation. In addition, the desalination device based on the eight-stage evaporator obtains a water collection rate of 13.44 kg m–2 and a salt collection rate of 1.77 kg m–2 per day under natural irradiation. More importantly, it can maintain a steady production for 15 days without obvious performance decay. This bifunctional multistage device provides a feasible and efficient approach for simultaneous desalination and solute collection.

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Section: Resultsmentioning

confidence: 90%

Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection

Tian,

Jiang,

Zhu

et al. 2024

Environ. Sci. Technol.

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“…1,12,13 Cyanide-containing coking wastewater with high organic matter contents, high toxicity, and high ammonia nitrogen concentrations is discharged at a rate of 270 million m 3 /year in PR China. 14 Reports showed that cyanide is toxic to aquatic life in the natural water environment. 12,13 Mansfeldt and Hohener 15 examined 37 groundwater samples that were contaminated by coking and electroplating wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Cyanide (−CN) plays a variety of roles in the water environment, such as a source for nitrogen and carbon, a reducing and complexing agent, a pseudohalogen, and a toxic compound among others, owing to its high hydrophilicity, low redox potential, and strong electron-withdrawing ability. , Cyanide is widely found in industrial wastewaters with different concentrations, e.g., those from metal surface treatment (45–300 mg/L), − noble metal ore dressing (50–500 mg/L), − petroleum refining and coking (10–1000 mg/L), − and other industrial production (somewhere between 10–4000 mg/L) (Table S1). ,, Cyanide-containing coking wastewater with high organic matter contents, high toxicity, and high ammonia nitrogen concentrations is discharged at a rate of 270 million m 3 /year in PR China . Reports showed that cyanide is toxic to aquatic life in the natural water environment. , Mansfeldt and Hohener examined 37 groundwater samples that were contaminated by coking and electroplating wastewater.…”

Section: Introductionmentioning

confidence: 99%

Function and Direction of Cyanide in Coking Wastewater: From Water Treatment to Environmental Migration

Chen,

Guan,

Pang

et al. 2023

ACS EST Water

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The secondary effluent of coking wastewater treatment plants often contains a low content but tenacious cyanides. In this study, a full-scale double physicochemical synergistic OHHO process was used to investigate the distribution of various cyanides in each unit. The cyanides tend to dissolve and be released under aerobic conditions and precipitated or be adsorbed under anaerobic/hydrolytic conditions. The toxicity and biochemical stability of cyanide conjugates bring about functional control of ammonification−nitritation−nitrification as total cyanides (TCNs) increase under polymetallic restriction. Polymetallic competitive inhibition and π bond activation between coexisting ligands (OH − , Cl − , NH 3 , and anionic dissolved organic matter (DOM)) and metal ions allowed us to maintain the balance between ionization and complexation of CN − . This paper explored the biological function and migration behavior of cyanide as an indicator in wastewater and water environments and proposed a feasible cyanide removal strategy via polymetallic competition. The synergy between competitive inhibition and activation owing to the coexistence of diverse ligands may benefit the stable occurrence of cyanides in the natural water environment, which is crucial for understanding the geochemical balance and cycle of characteristic pollutants.

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Solar driven photocatalytic disinfection by Z-scheme heterojunction of In2O3/g-C3N4: Performance, mechanism and application

Chen,

Jin,

Huang

et al. 2024

Applied Catalysis B: Environmental

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Integrated process for zero discharge of coking wastewater: A hierarchical cycle-based innnovation

Cited by 16 publications

References 27 publications

Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection

Solar-Driven Multistage Device Integrating Dropwise Condensation and Guided Water Transport for Efficient Freshwater and Salt Collection

Function and Direction of Cyanide in Coking Wastewater: From Water Treatment to Environmental Migration

Solar driven photocatalytic disinfection by Z-scheme heterojunction of In2O3/g-C3N4: Performance, mechanism and application

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