• Environmental Engineering Research
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• v.21 no.1
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• pp.45-51
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• 2016

Membrane bioreactor (MBR) and reverse osmosis (RO) membrane system was applied to the treatment and reclamation of textile wastewater in Thailand. An experiment was carried out to determine the fouling behavior and effect of anti-scalant and biocide addition to flux decline and its recovery through chemical cleaning. The RO unit was operated for one month after which the fouled membranes were cleaned by sequential chemical cleaning method. RO flux was found rapidly declined during initial period and only slightly decreased further in long-term operation. The main foulants were organic compounds and thus sequential cleaning using alkaline solution followed by acid solution was found to be the most effective method. The provision of anti-scalant and biocide in feed-water could not prevent deposition of foulant on the membrane surface but helped improving the membrane cleaning efficiencies.

• Journal of Korean Society on Water Environment
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• v.32 no.3
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• pp.303-309
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• 2016

This study aimed to assay the biological removal of TDS (total dissolved solids) from RO (reverse osmosis) rejected water. Following bio-sorption of TDS with AGS (aerobic granular sludge), the effects of TDS on biological nitrogen removal were examined. The bio-sorption of TDS after AGS treatment was confirmed by checking for TDS removal efficiency and surface analysis of microorganisms with SEM and EDS. Then, the effects of TDS on biological nitrogen removal and the denitrification efficiency were evaluated using the MBR reactor. According to the results, the bio-sorption of TDS with AGS was 0.1 mg TDS/mg AGS, and we confirmed that the microorganism surfaces had adsorbed the TDS. Biological nitrogen removal efficiency was measured at inhibiting denitrification at 4,000 mg/L of TDS-injected material. Based on this study, it is necessary to pretreat TDS-containing RO rejected water and to maintain TDS concentration lower than a specific value (≤4,000 mg/L), when considering biological nitrogen removal.

• Membrane Journal
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• v.10 no.4
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• pp.213-219
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• 2000

In order to resolve the problem of aged land[jlJ leachate treatment, limitation in removal of non-biodegradable materials and denitrification caused by carbon source shortage, we applied combined process consisted of 5MBR and RO to leachate treatment. We perfonned 5MBR pilot plant tests on Yongin City for a period of about lOOdays, demonstrated the performance of the SlVlUR process (($NH_3$-N removal efficiency; 90%). But there was also limitation to removal of non-biodegradable materials and denitrification. In full-scale plant we observed the IXrformance of combined process (SMI3R + R/O) in order to confirm the expected treatment efficiencies. Their results were approximately 98%, 94% of treatment efficiency in case of $COD_{Cr}$(<3 mg/L) and TN(<50 mg/L)respectively and the results of treatment were stable.