Investigation of Chemical Cost Reduction in Demineralized Water Production Process

Abstract:

The objective of this research is to reduce the chemical cost of demineralized water production process. The jar test is used to determine the optimum poly-aluminium chloride (PAC) dosage requirements. This paper investigates the effect of PAC dosage on the turbidity and the pH. Moreover, the mathematical models to predict the percentage of the turbidity and the pH removal are proposed and developed in this paper. According to the experimental results, the optimum PAC dosing not only reduces the cost of PAC, but also reduces the cost of Sodium Hydroxide (NaOH). Since the reduction of PAC causes the decrease in acidity in the raw water. Hence, the NaOH used to adjust the the pH of the raw water, has less dosage. The chemical cost of the demineralized water production process is reduced by 27.5%

• Periodical: Applied Mechanics and Materials (Volumes 253-255)
• Pages: 993-998
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.253-255.993
• Online since: December 2012
• Authors: Somkiat Tangjitsitcharoen, Bhoomchoopong Poolsuwan
• Keywords: Demineralized Water, Jar Test, pH, Poly-Aluminium Chloride (PAC), Turbidity

References

[1] EGAT Annual Report. ElectricityGenerating Authority of Thailand (2010).

[2] A. Franco, A. Russo. International Journal of Thermal Sciences 41 (2002), pp.843-859.

[3] P. Čuda, P. Pospíšil, J. Tenglerová. Desalination 198 (2006), p.41–46.

DOI: 10.1016/j.desal.2006.09.007

[4] P. Pulsawad. The Study of Chlorine Dioxide and Chlorine treatment of Algae in Water Treatment Process of Wang Noi Power Plant (2008).

[5] M. Tuntulwet. Water Supply Engineering (1995).

[6] N. Vijitjanyakool. Reduction of COD in wastewater from tannery industry by coagulation and oxidation (2000).

[7] S. Ghafari, H. A. Aziz, M. H. Isa and A. A. Zinatizadeh. Journal of Hazardous Materials. 163 (2009), p.650–656.

[8] S. Ghafari, H. A. Aziz and M. J. K. Bashir. Desalination 257 (2010), p.110–116.

[9] K. Wu, H. Wang, R. Liua, X. Zhaoa, H. Liua and J. Qua. Journal of Hazardous Materials. 185 (2010), pp.990-995.

[10] Z. Yang, B. Gao and Q. Yue. ChemicalEngineeringJournal. 165 (2010), p.122–132.

[11] Water Treatment Plant-Operation Manual. Darco Engineering Pte. Ltd. (2008).

[12] D.C. Montgomery. Design and Analysis of Experiments (2004).