Fouling mitigation in membrane bioreactors using multivalent cations

Mehrnia, Mohammad Reza; Azami, Hamed; Sarrafzadeh, Mohammad‐Hossein

doi:10.1016/j.colsurfb.2013.03.009

Cited by 25 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with the control, a slight decrease (about 9.75%) of flocculation ability was observed in the MBR-Na, which indicated that monovalent cations had a detrimental effect on flocs aggregation. This result was consistent with other studies (Mehrnia et al, 2013;Reid et al, 2006). In contract, multivalent cations exhibited a significant increase of flocculability, which could be attributable to neutralizing and stabilizing the negatively charged functional groups and forming bridges between flocs (Salehizadeh and Shokaosadati, 2001).…”

Section: Bioflocculation and Filterability Of Assupporting

confidence: 92%

“…Majority of Na + (on average 73%) was presented in the supernatant, and only about 37% in the slime, LB, TB and pellet. Previous study indicated that monovalent cations especially sodium joined with SMP and colloids and then neutralized their charge (Mehrnia et al, 2013). Neutralized SMP and colloids lean to suspend so that the sodium concentration was higher in the supernatant than that of the sludge floc.…”

Section: Distributions Of Cations In Asmentioning

confidence: 96%

“…Formation of activated sludge flocs or bioflocculation is a key property of AS in MBR systems affecting membrane fouling (Mehrnia et al, 2013), a well performing bioflocculation process is important to avoid severe membrane fouling in MBR systems (Van den Broeck et al, 2012). It was interesting to note that the cations of different valences showed different relationships to the AS flocculability (Fig.…”

Section: Bioflocculation and Filterability Of Asmentioning

confidence: 99%

See 2 more Smart Citations

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Zhang

Wang

Zhang

et al. 2014

Bioresource Technology

View full text Add to dashboard Cite

Section: Bioflocculation and Filterability Of Assupporting

confidence: 92%

Section: Distributions Of Cations In Asmentioning

confidence: 96%

Section: Bioflocculation and Filterability Of Asmentioning

confidence: 99%

See 1 more Smart Citation

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Zhang

Wang

Zhang

et al. 2014

Bioresource Technology

View full text Add to dashboard Cite

“…The trivalent cations (Al 3+ , Fe 3+ ) can serve to bind the negatively charged EPS and improve bioocculation through electrical neutralization and bridging. 19 Therefore, the activated oc size in GBD WWTP was larger than that in other WWTPs.…”

Section: Physicochemical Properties Of Sludge Ocmentioning

confidence: 95%

Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability

et al. 2015

View full text Add to dashboard Cite

Activated sludge is a highly changeable colloidal system. In this study, the dynamic variation in physicochemical characteristics, especially distribution and abundance of extracellular polymeric substances (EPS) of activated sludges from different WWTPs was investigated in order to establish the relationships between floc properties and the sludge dewatering property. Firstly, it was observed that the total EPS content of the activated sludge was significantly decreased with the rise in temperature.Three-dimensional fluorescence excitation-emission matrix (3D-EEM) spectroscopy analysis indicated that each sludge fraction (soluble EPS, loosely-bound EPS (LB-EPS), tightly bound EPS (TB-EPS) and pellet) from different WWTPs had a similar fluorescence fingerprint in the same time period. In addition, protein-like substances were found to be the dominant components in TB-EPS and pellets regardless of operating time for each WWTP sludge. At low temperatures, soluble EPS and LB-EPS also mainly contained protein-like compounds, while the amount of humic acids of them was increased significantly in the summer. According to Pearson's correlation analysis, normalized CST correlated well with the composition and content of soluble EPS, indicating that the change in soluble EPS properties caused fluctuation of sludge dewatering behavior. Finally, we proposed some operating strategies for improving the dewatering performance of activated sludge in full-scale WWTPs by regulating the soluble EPS properties.Correlation is signicant at the 0.05 level (2-tailed). bCorrelation is signicant at the 0.01 level (2-tailed). c SEPS-soluble EPS, LB-LB-EPS, TB-TB-EPS, S1-region I of soluble EPS, S2-region II of soluble EPS, S3-region III of soluble EPS, S4-region IV of soluble EPS,.This journal is

show abstract

“…In a first intention, a calcium salt was used in order to improve the formation of adsorbent materials. Since all the calcium ions are not totally consumed during EC, it is not excluded that the residual calcium has also a positive effect in mitigation of biofouling [37][38][39]. "…”

Section: Introductionmentioning

confidence: 99%

Treatment of artificial pharmaceutical wastewater containing amoxicillin by a sequential electrocoagulation with calcium salt followed by nanofiltration

Oulebsir

Chaabane

Tounsi

et al. 2020

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

The present study deals with the treatment of an artificial pharmaceutical waste which contained amoxicillin (AMX) by using successively an electrocoagulation (EC) with Ca(NO3)2 as an electrolyte and a nanofiltration (NF) with a Nanomax-50 membrane. The effect of the current intensity and of the operating pressure was investigated for separately EC and NF, respectively. The AMX removal as a function of pH and initial AMX concentration was also investigated for the separately conducted EC and NF processes. The best percentage removal of AMX by EC and NF was recorded to be 52.7% and 99.0%, respectively. In the case of the sequential processes EC followed by NF, the removal of AMX was 98.2% and J o u r n a l P r e -p r o o f 97.5% at pH 2.5 and 10, respectively. The contribution of both EC and NF towards the AMX removal efficiency in the case of the sequential process was very much significant. It is remarkable that the EC pre-treated feed into NF was explored with several benefits such as high removal efficiency, calcium involved in EC process, prolonged membrane life and reduced power consumption. The electrogenerated solids (the sediment and the cathode deposit) were characterized using Fourier Transform Infra-red spectroscopy (FTIR), Energy Dispersive Spectroscopy (EDS) coupled to Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Thermo Gravimetry Analysis (TGA). It appeared that calcium was involved in the electrogenerated solids. It gave a cathode deposit of Ca(OH)2 in which some AMX was embedded.

show abstract

Fouling mitigation in membrane bioreactors using multivalent cations

Cited by 25 publications

References 36 publications

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Impact of sludge cation distribution pattern on its filterability in membrane bioreactor

Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability

Treatment of artificial pharmaceutical wastewater containing amoxicillin by a sequential electrocoagulation with calcium salt followed by nanofiltration

Contact Info

Product

Resources

About