The addition of a low concentration of PAC (0.5 g L−1 of sludge, i.e. a dose of 4 mg L−1 of wastewater), in combination with a relatively long SRT (50 days), to improve membrane filtration performance was investigated in two pilot-scale MBRs treating real municipal wastewater. Continuous filterability tests at high flux showed the possibility to run for 18 h at 72 L m−2 h−1 and 180 h at 50 L m−2 h−1, while significant fouling occurred without PAC. In addition, measurements of the critical flux showed an increase of 10% for this strategy. Low dosage and high retention time makes it feasible and cost effective. Further advantages with regard to permeate quality and possible micropollutants removal are currently under investigation.
- Powdered activated carbon
- Membrane fouling
- Activated sludge
- Membrane bioreactor
Remy, M., van der Marel, P., Zwijnenburg, A., Rulkens, W., & Temmink, H. (2009). Low dose powdered activated carbon addition at high sludge retention times to reduce fouling in membrane bioreactors. Water research, 43(2), 345-350. https://doi.org/10.1016/j.watres.2008.10.033