Process development of flue gas desulphurization wastewater treatment in coal-fired power plants towards zero liquid discharge: Energetic, economic and environmental analyses
| Autor: | Zhang Dan, Zhao Shuran, Junjie Yan, Xiaoqu Han, Jiping Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Waste management
Environmental analysis Renewable Energy Sustainability and the Environment 020209 energy Strategy and Management 05 social sciences 02 engineering and technology Zero liquid discharge Industrial and Manufacturing Engineering Wastewater Waste heat 050501 criminology 0202 electrical engineering electronic engineering information engineering Environmental science Sewage treatment Cost of electricity by source Flue Zero emission 0505 law General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 261:121144 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2020.121144 |
| Popis: | Zero emission of wastewater from coal-fired power plants (CFPPs) is one of the pathways for cleaner electricity production. It is expected that low-cost and reliable zero liquid discharge (ZLD) of flue gas desulphurization (FGD) wastewater will be achieved by applying the forced circulation multi-effect distillation and crystallization (FC-MEDC) technology. In the present work, different FGD wastewater ZLD processes were compared in terms of energy consumption, economic cost and environmental impact. The results suggest that the levelized cost of water (LCOW) could be reduced by the integration of pre-concentration and waste heat utilization with FC-MEDC. Typically, the LCOW could be reduced by 9.5% and 28.8% in reverse osmosis (RO) and flue evaporation (FE) incorporation scenarios, respectively. The implementation of crystal seed technology in the FE-assisted FC-MEDC system significantly decreased the LCOW by 45.4% for chemical pretreatment cost reduction. A further parametric study was performed to examine the influence of key variables on the LCOW. Overall, a comprehensive investigation of FC-MEDC treatment of FGD wastewater was performed, resulting in cost-effective design of a thermal ZLD process with a minimum LCOW of 5.60 $/m3. Sensitivity analysis was conducted, revealing the influence of market factors on the economic viability of different schemes. In addition, environmental analysis indicates that the greenhouse gas (GHG) emissions from the FGD wastewater ZLD processes ranged from 38.1 to 86.8 kg CO2-eq/m3 in different scenarios and representative regions, and could be notably reduced by 51.7%. The methodology and results are useful for wastewater ZLD process screening to minimize costs and environmental impacts. |
| Databáze: | OpenAIRE |
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