Min-Jung Jeon

Bio: Min-Jung Jeon is an academic researcher. The author has contributed to research in topics: Membrane fouling & Fouling. The author has an hindex of 1, co-authored 3 publications receiving 3 citations.

Comparison of physical cleaning applied to chemical backwashing of wastewater reuse membrane system

Abstract: Biologically treated water contains a large quantity of organic matters and microorganisms which can cause various problems to membrane. The membrane fouling occurred by these reasons is hard to control by single physical cleaning. This study analyzes the efficiency of aeration with chemical backwashing and foulants removal during chemical backwashing. The cleaning efficiency improves when the chemical concentration is high and the contact time of chemical is long. Chemical backwashing with aeration shows exceptional cleaning efficiency which leads the physical cleaning is required during chemical backwashing since it forms flow inside the membrane submerged tank. From the foulants removal analysis, the particles such as turbidity and TOC removal rate increase when the aeration is applied. Dissolved matter of DOC and UV254 removal is dependent on higher chemical concentration. According to FTIR analysis, one of major foulants, the polysaccharide is controlled by the chemical backwashing with aeration condition.

Evaluation on Chemical Cleaning Efficiency of Organic-fouled SWRO Membrane in Seawater Desalination Process

Abstract: Membrane fouling is an unavoidable phenomenon in operation of seawater reverse osmosis (SWRO) and major obstacle for economic and efficient operation. When fouling occurs on the membrane surface, the permeate flux is decreased, on the contrary, the trans-membrane pressure (TMP) is increased, therefore operation and maintaining costs and potential damage of membranes are able to the pivotal risks of the process. Chemical cleaning process is essential to prevent interruptions for effective RO membrane filtration process. This study focused on proper chemical cleaning condition for polyamide RO membranes of 4 companies. Several chemical agents were applied for chemical cleaning under numbers of operating conditions. Additionally, a monitoring tool of FEEM as autopsy analysis method is adapted for the prediction of organic bio-fouling.

A study on the Development and Evaluation of Sludge Occlusion Reduced Diffuser

Abstract: The diffuser which is conventionally adapted to MBR, has problem that decreasing the cleaning effect of membrane module by inflexible air supply due to the occlusion of sludge from diffuser hole. To solve this problem, diffuser structure of submerged module should be improved to discharge sludge which is flow into the diffuser for prevent occlusion in the diffuser. In this study, the structure of the diffuser was reformed to open lower part for preclusion the blocking. And the outlet diameter of the diffuser was drawn through the condition for the depth of water and air rate, to prevent air-leak condition of improved diffuser. Moreover, application is evaluated by comparing test with occlusion effect of the conventional and improved diffuser. From the results, air-water boundary changes are steady with changes of water depth and it shows linear relation about air rate. By using this linear numerical formula, the height of diffuser's outlet can be decided. Also, it displays that it can prevent the occlusion effect during the comparing test. Hereafter, if this diffuser is applied to practical MBR process, the occlusion problem of diffuser will be disappeared.

Evaluation of chemical cleaning efficiency of organic-fouled SWRO membrane by analyzing filtration resistance

Abstract: Membrane fouling is an unavoidable phenomenon in the operation of seawater reverse osmosis and a major obstacle to economic and efficient operation. In particular, membrane fouling by organic matter negatively affects productivity, product quality, and process cost. Therefore, a chemical cleaning process is essential to prevent interruptions for an effective RO membrane filtration process. Firstly, this study focused on the proper chemical cleaning condition for commercial polyamide RO membranes purchased from two companies. The flux decline rate of SWC5+ membrane was higher than that of SW39HRLE400 membrane regardless of organic foulants because the initial zeta potential of SWC5+ membrane (−21.17 mV) was lower than that of SW30HRLE400 membrane (−30.11 mV) and the repulsive force between membrane surface and foulants was also lower. In addition, we attempted to evaluate cleaning efficiency according to the chemical cleaning conditions and investigate the cause of fouling by analyzing membrane re...

Construction Method of Zero Discharge System for Environmental Energy Complex in Landfill

Abstract: A research was performed for zero discharge system of waste water which is produced from energy recovery process of waste and biomass. Leachate and all kinds of waste water should be separated and integrated into three categories in addition to converting existing leachate treatment facility into waste water treatment facility as well as introducing a management system of reverse osmosis membrane facility and bioreactor landfill. Following these conditions to better water treatment process, it was likely to produce over 3,000 tons of low-grade recycling water and 2,000 tons of high-grade recycling water per day when zero discharge system of waste water is applied starting from 2016. Economical efficiency was also surveyed in total treatment fee. Present system costs 18,129 million won per year, and suggested zero discharge system would cost 15,789 million won per year.