With the pollution of freshwater sources and the continual increase in freshwater demand due to rapid industrialization and population explosion, the globe is facing an eminent danger of scarcity of freshwater. One way to increase the water supply beyond the hydrological cycle is to reuse and recycle the waste water by developing an onsite recycling/reclamation technology. Such a bench-scale treatment technology was developed to treat the cooling tower blowdown water (CTBW) from the cooling towers of California State University, Long Beach (CSULB). The CTBW was treated by using electrodialysis.
The main objective of this project was to bring down the level of total dissolved solids (TDS) of the CTBW to lower than 230 mg/L which is equivalent to the TDS level of tap water provided by the Long Beach Water Department. The secondary objective was to regenerate the hydrochloric acid using the waste ions. Two differently configured electrodialysis cells (onechambered and two-chambered cell) were used and their treatment efficiencies were compared. The one-chambered cell successfully reduced the TDS level by upto 48% for three samples tested in the setup. The two-chambered cell achieved the TDS reduction up to 93.4% for the four samples tested in the setup. The study was successful in regenerating 1.42 mol/L concentration of hydrochloric acid. An economic and water savings analysis was also performed. Calculations showed that by implementing this technology, it is possible to save 10,362,564.76 L/year which translates to $10,813.13 in economic savings. The total annual savings were estimated to be $12,984.01. The payback period for the investment in this study was 50 months, thus a profit of $15,949.48 is expected by the end of the equipment life of the setup.
|Advisor:||Hong, Jin G.|
|Commitee:||Asvapathanagul, Pitiporn, Kim, Joseph|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Chemical engineering, Environmental engineering|
|Keywords:||Cooling tower blowdown water, Electrodialysis, Treatment, Wastewater|
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