Next Article in Journal
Influence of Rainfall Characteristics on Total Suspended Solids in Urban Runoff: A Case Study in Beijing, China
Next Article in Special Issue
Optimizing Hollow Fibre Nanofiltration for Organic Matter Rich Lake Water
Previous Article in Journal
Soil Moisture Retrieval Based on GPS Signal Strength Attenuation
Article Menu

Export Article

Open AccessArticle
Water 2016, 8(7), 277; doi:10.3390/w8070277

Retention of Silica Nanoparticles in a Lab-Scale Membrane Bioreactor: Implications for Process Performance and Membrane Fouling

1
Department of Environment and Energy, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747, Korea
2
JIU Corporation, Yangcheon-ro, Gangseo-gu, Seoul 157-801, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Stephen Gray and Hideto Matsuyama
Received: 9 May 2016 / Revised: 20 June 2016 / Accepted: 27 June 2016 / Published: 4 July 2016
(This article belongs to the Special Issue Advanced Membranes for Water Treatment)
View Full-Text   |   Download PDF [2383 KB, uploaded 4 July 2016]   |  

Abstract

In conventional activated sludge (CAS) involving aerobic biological processes, the retention of silica nanoparticles (SiO2 NPs) has no detrimental effect on chemical oxygen demand (COD) and ammonia nitrogen (NH3–N) removal. However, for the membrane bioreactor (MBR) system, which is also based on the activated sludge process in addition to the membrane separation process, it has implications not only on the process performance but also on membrane fouling. To investigate these two implications in lab-scale experiments, we continuously operated a control MBR and two experimental MBRs, in which the 28 nm SiO2 NPs and 144 nm SiO2 NPs were added separately to the influent at a final concentration of 100 mg/L. Although the retention of SiO2 NPs in the MBR, as confirmed by dynamic light scattering (DLS) analysis, did not compromise the COD and NH3–N removal, it resulted in substantial increases in the transmembrane pressure (TMP) suggesting the onset of membrane fouling. Analyses by batch-dead end filtration revealed the same fouling trend as observed during the continuous MBR experiments; membrane fouling is aggravated in the presence of SiO2 NPs. This was evident from permeate flux decline of between 30% and 74% at very low TMP (5 kPa) and the further increases in the total resistance. View Full-Text
Keywords: silica nanoparticles; membrane bioreactor; membrane fouling; activated sludge respiration inhibition silica nanoparticles; membrane bioreactor; membrane fouling; activated sludge respiration inhibition
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Sibag, M.L.; Lee, S.M.; Kim, H.J.; Cho, J. Retention of Silica Nanoparticles in a Lab-Scale Membrane Bioreactor: Implications for Process Performance and Membrane Fouling. Water 2016, 8, 277.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top