Novel pulp mill wastewater recovery process for CO2 and SOx utilization

Hyejeong Lee, Jonghun Lim, Hyungtae Cho, Junghwan Kim

Research output: Contribution to journalArticlepeer-review


Pulping industry has a pulp mill process that emits a significant amount of carbon dioxide (CO2) and sulfur oxides (SOx). The pulp mill wastewater has a high potential for reducing pollution caused by CO2 and SOx because it contains useful mineral ions in high concentrations, such as Ca2+, Mg2+, Na+, and K+ that react with carbonate and sulfate ions. In this study, we develop a novel pulp mill wastewater recovery process for CO2 and SOx utilization. To design the CO2 and SOx capture and utilization process using pulp mill wastewater, a process model is developed based on validated experimental data. The developed process model comprises the following three steps: (1) metal ion separation of pulp mill wastewater to produce KClO4, Mg(OH)2, and Ca(OH)2; (2) SOx capture and utilization using Ca(OH)2 and SOx, utilized as desulfurization gypsum; (3) CO2 capture via generated KClO4, and the captured CO2 is utilized as carbonate using Mg(OH)2 and Ca(OH)2. Accordingly, the economic feasibility of the suggested process model is demonstrated by calculating the pay-back period in economic assessment. As a result, the desulfurization efficiency was 99% with high-purity gypsum production. In addition, ∼98.2% CO2 was captured. Furthermore, the annual profit was increased by USD 94,469, and thus, the pay-back period was determined as 8.4 y.

Original languageEnglish
Article number133298
JournalJournal of Cleaner Production
Publication statusPublished - 2022 Oct 15

Bibliographical note

Funding Information:
This work was supported by the Korean Institute of Industrial Technology within the framework of the following projects: “Development of Global Optimization System for Energy Process [grant number IR-22-0040 , IZ-22-0049 , UR-22-0031 ]” and “Development of complex parameter smart analysis modules for color customering [grant number EH-22-0011 ]”.

Publisher Copyright:
© 2022 The Authors

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering


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