Assessment of online bacterial particle counts for monitoring the performance of reverse osmosis membrane process in potable reuse
| Autor: | Takahiro Fujioka, Ryo Makabe, Shane A. Snyder, Naomichi Mori, Menu Leddy |
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| Rok vydání: | 2018 |
| Předmět: |
Water reclamation
Osmosis Environmental Engineering 010504 meteorology & atmospheric sciences Particle (ecology) 010501 environmental sciences Reuse 01 natural sciences Waste Disposal Fluid Water Purification RO membrane Water Quality Potable water reuse Real-time bacterial count Environmental Chemistry Reverse osmosis Waste Management and Disposal 0105 earth and related environmental sciences Integrity monitoring Continuous monitoring Membranes Artificial Pulp and paper industry Pollution Performance monitoring Environmental science Water treatment Water quality Flow cytometer Water Microbiology Filtration |
| Zdroj: | The Science of the total environment. 667 |
| ISSN: | 1879-1026 |
| Popis: | Safety of potable reuse can be enhanced by improved water quality monitoring techniques for assessing water treatment processes. This study evaluated the efficacy of online bacterial counting for continuous monitoring of reverse osmosis (RO) membranes to remove bacteria using real-time bacteriological commercial counters and an on-site pilot-scale RO system. Prior to on-site assessments,the online bacterial counting was verified by comparing the measurement of fluorescent particles in water with flow cytometry. During a seven day pilot test of RO treatment at a water reclamation plant, online bacterial counts in RO permeate were monitored below 15 counts/mL; whereas the bacterial counts in RO feed water were approximately 2500 to 10,000 counts/mL. Removal rates of bacterial counts ranged from 2.6 to 3.1-log (average = 2.9-log) by continuously monitoring bacterial removal. This is greater than a 2-log reduction frequently determined using other water quality surrogates (i.e., electrical conductivity). Overall, the continuous monitoring of bacteria in RO feed and permeate can be implemented without the addition of chemicals to provide near real-time bacterial counts to measure their reduction after RO treatment.This can be developed for continuous performance monitoring of the RO process,providing greater assurance of microbial water quality after RO treatment. Science of the Total Environment, 667, pp.540-544; 2019 |
| Databáze: | OpenAIRE |
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