Construction and application of a <i>Water - Energy - Carbon</i> comprehensive evaluation system for emulsion treatment technologies

ZHAI Gongqi; HUANG Xiangfeng; XIONG Yongjiao; LI Lexue; ZHANG Jialu; WANG Liya; PENG Kaiming

doi:10.13205/j.hjgc.202504015

Volume 43 Issue 4

Apr. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(4): 156-164

ZHAI Gongqi, HUANG Xiangfeng, XIONG Yongjiao, LI Lexue, ZHANG Jialu, WANG Liya, PENG Kaiming. Construction and application of a Water - Energy - Carbon comprehensive evaluation system for emulsion treatment technologies[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(4): 156-164. doi: 10.13205/j.hjgc.202504015

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ZHAI Gongqi, HUANG Xiangfeng, XIONG Yongjiao, LI Lexue, ZHANG Jialu, WANG Liya, PENG Kaiming. Construction and application of a Water - Energy - Carbon comprehensive evaluation system for emulsion treatment technologies[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(4): 156-164. doi: 10.13205/j.hjgc.202504015

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Construction and application of a Water - Energy - Carbon comprehensive evaluation system for emulsion treatment technologies

doi: 10.13205/j.hjgc.202504015

1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Institute of Carbon Neutrality, Tongji University, Shanghai 200092, China

Received Date: 2023-08-19
Accepted Date: 2023-12-12
Rev Recd Date: 2023-11-20

Available Online: 2025-06-07

Publish Date: 2025-04-01

Abstract

Abstract

The treatment technologies for waste emulsions are diverse， with significant differences in technical characteristics and applicability. However， a unified standard for technology evaluation has not yet been established. Under the backdrop of carbon peaking and carbon neutrality， how to conduct a comprehensive and objective technical evaluation of waste emulsion treatment technologies has attracted great attention. In this paper， a comprehensive evaluation system of Water-Energy-Carbon was constructed， and the waste emulsion treatment technologies such as chemical demulsification， evaporation， and membrane separation were comprehensively evaluated by using influent water quality， oil reduction， electricity consumption， energy consumption carbon emissions， drug consumption carbon emissions， carbon compensation indexes， and Water-Energy-Carbon coupling index （WECCI）， and these technologies were quantitatively analyzed in combination with engineering cases.The research revealed that the traditional chemical demulsification method was the most widely applied， primarily for waste emulsions with simple compositions and low pollutants concentrations. It was characterized by low energy consumption but high chemical consumption， with an energy consumption typically below 10 kW·h/t and carbon emissions ranging from 20 to 80 kg CO₂eq/kg. Evaporation methods were also employed for waste emulsion treatment in recent years， particularly for complex， stable emulsions with high oil content. It was characterized by high energy consumption and high carbon emissions， with energy consumption reaching 60 kW·h/t and carbon emissions ranging from 10 to 40 kg CO₂eq/kg.Membrane separation technology was extensively studied experimentally. It was characterized by low energy consumption and low carbon emissions， with energy consumption typically ranging from 5 kW·h/t to 35 kW·h/t and carbon emissions below 20 kg CO₂eq/kg. This method showed promising prospects for future development. The Water-Energy-Carbon evaluation results of a waste emulsion treatment center in Jiangsu showed that the carbon emissions of mechanical vapor recompression （MVR）， coagulation air flotation， and magnetic flocculation units were 38.55， 22.87 and 13.39 kg CO₂eq/kg， respectively， and their WECCI were 0.379， 0.524， and 0.705， respectively. MVR had strong universality and good treatment effect， but the energy consumption and carbon emissions were high， and the comprehensive performance was medididare. As a new type of chemical demulsification method， magnetic flocculation had good treatment effects， low energy consumption and carbon emissions， high level of hydro-carbon coupling， indicating a better comprehensive performance. This study provides a new multidimensional method for the evaluation and selection of waste emulsion treatment technologies. Future research can expand the evaluation system by incorporating indicators such as lifecycle assessment and regional adaptability， ensuring its high applicability in diverse environments.
- waste emulsions,
- demulsification and separation technology,
- evaluation system,
- Water-Energy-Carbon,
- carbon emissions

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References(33)

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