| Title |
Cost Estimate of Membrane Processes for Drinking Water Supply |
| Authors |
서연태(Youn Tae Seo),정동환(Dong Hwan Chung),임성균(Seong Kyun Lim),박규홍(Kyoo Hoon Park) |
| Abstract |
In order to estimate the cost of microfiltration(MF), ultrafiltration(UF), nanofiltration(NF), and reverse osmosis(RO) membrane processes, the operating data obtained from the existing water supplying facilities were collected and analyzed. The effect of flux, recovery, the frequency of flushing, and design capacity was investigated on the cost of membrane processes for drinking water supply. One of the best ways of maintaining the economic membrane processes is to maximize the efficiency of membrane operation. The highest flux and maximized cleaning intervals should be maintained within the range of mass transport limit, recovery must be increased in general. In the existing MF, UF, and NF plants. cost was calculated to increase quickly as the design capacity decreased below 12,000㎥/d. Above 40,000㎥/d of design capacity, the predicted decreasing rate of cost was flattened. At 40,000㎥/d, the cost of MF, UF, and NF was $0.08/㎥, $0.12/㎥, $0.23/㎥, respectively. Permeate quality for NF would be about the same as for RO, but it was much improved compared with MF and UF. Although cost of NF was twice as much as UF cost, it was only half of that in conventional ozone-GAC process with design capacity of up to 19,000㎥/d. When cost and permeate quality of NF was considered. NF seemed very competitive or less expensive than the other processes for drinking water supply. |