Pilot plant test of SWRO pre-treatment using submerged MF membrane in Changwon city, Korea

Pilot plant test of SWRO pre-treatment using submerged MF membrane in Changwon city, Korea
Issue Date
IWA Regional Conference and Exhibition on Membrane Technology and Water Reuse
Membrane pre-treatment process is hot issue in SWRO (sea water reverse osmosis) desalination because it guarantee better permeate quality and small foot-print compared to conventional pre-treatment process. However, fouling control is essential to operate membrane pre-treatment process. If it fails, operation expenditure will be increased by replacing membranes or adding more chemicals to clean it. Submerged membrane process could treat feed water of harsh quality like as membrane bioreactor in sewage treatment. In this research, to develop membrane pre-treatment system which could produce a low-fouling feed water of RO system and be operated stably in spite of the variations of sea water quality, pilot test was performed. Submerged type MF (micro filter) membrane has been tested during 1 year in pilot plant (200 m3/day) as pre-treatment process of SWRO desalination. The pilot plant is located on the shore of Changwon city, Korea and near small stream. Therefore the turbidity of feed water was shored in rainy season by mixing with surface water of high turbidity. The pilot plant is consist of two types of pre-treatment system containing conventional and membrane pre-treatment process and two separated RO systems which connected to each pre-treatment process. Conventional pre-treatment process composed of coagulation/flocculation, sedimentation and 2-stage sand filter was installed to compare the performance with membrane pre-treatment process using the same feed water. In membrane pre-treatment process, in-line flash mixer was followed by 2-stage submerged type MF membrane module. Membrane process is operated with 1) high flux condition, 2) low flux condition and 3) low flux condition with coagulation. The average turbidity of submerged MF permeate was 0.07 NTU while that of conventional process was 0.23 NTU. And the SDI value of membrane process was lower steadily than that of conventional process. RO recovery of
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