Impact of Calcium on the Membrane Fouling in Membrane Bioreactors
Fouling in submerged membrane bioreactors (MBRs) was studied under two calcium levels (280 and 830 mg/L). Two MBRs were operated on synthetic municipal wastewater at a solids retention time (SRT) of 15 days, a control at a calcium level of around 35 mg/L and a test reactor at two calcium levels of 280 and 830 mg/L. Permeability, flux, extracellular polymeric substances (EPS), Ca2+ concentration and particle size distribution were measured regularly in both reactors to investigate the cause of membrane fouling. The test reactor showed 35% higher permeability than the control at 280 mg/L of calcium. However, at 830 mg Ca2+/L feed, the permeability in the test reactor stabilized at 0.15 LMH/kPa approximately 50% lower than the control. The lower membrane fouling rate in the Ca2+ fed MBR at an influent calcium concentration of ∼ 280 mg/L can be attributed to cationic bridges with EPS within the floc. Statistical analysis was used to specify the degree of influence of each of EPS type, calcium concentration in the sludge, and mean floc size on membrane permeability. Among all these variables, the calcium concentration in sludge was proven to affect the permeability most significantly. Thus, the reduction in membrane permeability at higher calcium concentration (∼ 830 mg/L) was the result of very high Ca2+ concentrations in the sludge that contributed to significant inorganic fouling
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2007-10-01
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites