Bacterial growth in batch-operated membrane filtration systems for drinking water treatment

摘要: Abstract Membrane filtration treats drinking water by physical removal of bacteria and other particles present in the raw water. In order to study post-filtration contamination growth, filtered river wastewater were used a controlled laboratory-scale simulation batch-operated membrane system. Bacterial batch growth was analyzed following intentional initial with microbial community. Batch permeate measured online flow cytometry at high intervals during 10 successive 24-hour operational cycles, simulating repeated daily use (filtration followed stagnation). Two mechanisms influenced characteristics: (1) selection adapted conditions, (2) biofilm formation on surfaces containers. The first mechanism contributed towards stable reproducible behavior (lag phase less than 4 h, maximum rates 0.37–0.42 h −1 final total cell counts 1.5–1.8 × 10 6  cells mL ) throughout several consecutive cycles. When feed changed, bacterial communities grew rapidly proportionally amount substrate new source. Biofilm development containers resulted 20% reduction overall production five days, suggesting this be potential novel strategy controlling biological stability such systems.