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- Title
An economical process to recover sulfuric acid and tetrabutylammonium ions from acidic saline wastewater with organics.
- Authors
Jian Zhang; Dongfang Niu; Xinsheng Zhang; Shuozhen Hu
- Abstract
Wastewater containing high contents of salt, organics, acids, or other compounds pollutes the environment. It is necessary and important to treat wastewater and recover reusable materials before the discharge. Diffusion dialysis (DD), electrodialysis (ED) and bipolar membrane electrodialysis (BMED) are combined in three different ways in this study. These methods are compared on their operating time, energy consumption, as well as recovery of sulfuric acid and tetrabutylammonium (TBA) ions. Results suggest that DD-ED-BMED is the best combination with the shortest operation time and least energy consumption. The recovery of sulfuric acid reaches 99.6%, while that for TBA+ is 93.1%. An economical evaluation is discussed. To minimize the total cost of treating 150 L wastewater per hour, the total membrane area of DD process needs to be 179.4 m². Total membrane area for ED process is 85.61 m². For BMED process, 27.43 m² of bipolar membrane and 54.86 m² of anion exchange membranes and cation exchange membranes should be used. In this case, the total cost would be 142,474 $/year, of which equipment investment is 71,292 $/year and electricity is 71,182 $/year. Sulfuric acid and TBAOH can be recovered with 315.1 ton/year and 37.40 ton/year, respectively.
- Subjects
ELECTRODIALYSIS process in sewage purification; SULFURIC acid; ENERGY consumption
- Publication
Desalination & Water Treatment, 2018, Vol 129, p149
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.23077