Technical and Financial Feasibility Study on Recycle Water Treatment System from Wastewater: A Case Study of Automobile Manufacturer

Main Article Content

นันทชัย กานตานันทะ


The objective of this research is to study the possibility to take the wastewater from production and processes in the factory which are already treated by the wastewater treatment system to recycle in order to replace the tap water. The technical study of the recycle water treatment system from wastewater compares the properties of four membrane types including microfiltration, ultrafiltration, nanofiltration and reverse osmosis membranes to choose ones that are appropriate with the characteristics of the wastewater from the factory. The technical feasible alternative is then analyzed the financial aspects for decision making. According to the technical study result, it shows that the recycle water treatment system from wastewater should consist of two main membrane units, the pre-treatment unit with a microfiltration membrane and the purified unit with a reverse osmosis membrane regeneration. For the financial analysis at 10% discount rate, it shows that the net present value is 1,077,668.46 baht, the internal rate of return is 11.11% which is higher than the minimum attractive rate of return, the benefit/cost ratio is 1.03 and the discount payback period is 13 years and 2 months, indicating that the project is feasible to invest. The sensitivity analysis varies four factors within the range of ±25% including the capital investment cost, the benefit, the operating expenses and the discount rate. The changes in the factors that result in the infeasibility of the project are 10% increase in the capital investment cost, 10% increase in the operating expenses, 5% decrease in the benefit and 15% increase in the discount rate.


Download data is not yet available.

Article Details

Research Article


N. Atanasova, M. Dalmau, J. Comas, M. Poch, I. Rodriguez-Roda, and G. Buttiglieri, “Optimized MBR for greywater reuse systems in hotel facilities,” Journal of Environmental Management, vol. 193, pp. 503–511, May 2017.

ธีรพงศ์ สว่างรัตน์, “การศึกษาความเป็นไปได้ในการนำกลับน้ำเสียมาใช้ใหม่ในระบบชักโครกด้วยระบบกรองคาร์บอนและฆ่าเชื้อโรคด้วยคลอรีน,” วิทยานิพนธ์ วิศวกรรมศาสตรบัณฑิต (สิ่งแวดล้อม), มหาวิทยาลัยเกษตร ศาสตร์, กรุงเทพฯ, 2551.

“การวิเคราะห์โครงการ,” มหาวิทยาลัยสุโขทัยธรรมาธิราช. [ออนไลน์]. แหล่งที่มา: html. [เข้าถึงเมื่อ: 17-ก.พ.-2560].

A. Marchioni and C. A. Magni, “Investment decisions and sensitivity analysis: NPV-consistency of rates of return,” European Journal of Operational Research, vol. 268, no. 1, pp. 361–372, Jul. 2018.

ทนงศักดิ์ วัฒนา, “เรียนรู้การรีไซเคิลน้ำเพื่อการใช้น้ำที่ยั่งยืน,” วารสารส่งเสริมเทคโนโลยี, ปีที่ 39, ฉบับที่ 225, หน้า 71-74, ตุลาคม-พฤศจิกายน 2555.

I. Petrinic, J. Korenak, D. Povodnik, and C. Hélix-Nielsen, “A feasibility study of ultrafiltration/reverse osmosis (UF/RO)-based wastewater treatment and reuse in the metal finishing industry,” Journal of Cleaner Production, vol. 101, pp. 292–300, Aug. 2015.

J. Garcia-Ivars, L. Martella, M. Massella, C. Carbonell-Alcaina, M.-I. Alcaina-Miranda, and M.-I. Iborra-Clar, “Nanofiltration as tertiary treatment method for removing trace pharmaceutically active compounds in wastewater from wastewater treatment plants,” Water Res., vol. 125, pp. 360–373, Nov. 2017.

A. Suárez, P. Fernández, J. Ramón Iglesias, E. Iglesias, and F. A. Riera, “Cost assessment of membrane processes: A practical example in the dairy wastewater reclamation by reverse osmosis,” Journal of Membrane Science, vol. 493, pp. 389–402, Nov. 2015.

R. Ordóñez, D. Hermosilla, I. S. Pío, and Á. Blanco, “Evaluation of MF and UF as pretreatments prior to RO applied to reclaim municipal wastewater for freshwater substitution in a paper mill: A practical experience,” Chemical Engineering Journal, vol. 166, no. 1, pp. 88–98, Jan. 2011.