Exploring the essential factors of performance improvement in sludge membrane bioreactor technology coupled with symbiotic algae

Copyright © 2020. Published by Elsevier Ltd..

In this study, a coupled system of algal-sludge and membrane bioreactor (AS-MBR) was established for fouling control, and meanwhile the performance of wastewater treatment was enhanced. Results indicated that the AS-MBR increased the COD, NH4+-N, TN and PO43- -P removal efficiencies from 91.7% to 95.9%, 90.8%-96.9%, 22.0% to 34.3% and 18.4%-32.6%, respectively. Further analysis suggested that in the AS-MBR, the total specific oxygen utilization rate (SOUR), the SOUR of ammonia oxidizing bacteria and the SOUR of nitrite oxidizing bacteria were 26.6%, 58.5% and 52.4% higher than the control, respectively, indicating the improvement of microbial activities in AS-MBR. Additionally, the membrane fouling rates in the AS-MBR were 52.6% and 32.2% lower than the control in the slow and rapid fouling processes, respectively. A further mechanism investigation demonstrated that the concentrations of extracellular polymeric substance (EPS) were decreased by 19.8% and 22.1% in the mixed liquid and the fouling layer, respectively, after the inoculation of algae, which was expected to have a positive effect on the higher permeability and longer operation cycle of the membrane in the AS-MBR. More regular floc morphology was observed for the fouling layer on the membrane of AS-MBR, with the polysaccharides and proteins forming large clusters and channels in the fouling layer that likely decreased the filtration resistance. Consequently, high-throughput sequencing analysis revealed that the microbial community in the AS-MBR had higher abundances of bacteria and algae related to nutrients and organic matters degradation, which was beneficial for the improvement of wastewater treatment and alleviation of membrane fouling.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:181

Enthalten in:

Water research - 181(2020) vom: 15. Aug., Seite 115843

Sprache:

Englisch

Beteiligte Personen:

Sun, Li [VerfasserIn]
Ma, Jinxing [VerfasserIn]
Li, Lipin [VerfasserIn]
Tian, Yu [VerfasserIn]
Zhang, Zhong [VerfasserIn]
Liao, Huaiyu [VerfasserIn]
Li, Jibin [VerfasserIn]
Tang, Wangwang [VerfasserIn]
He, Di [VerfasserIn]

Links:

Volltext

Themen:

Algal-sludge membrane bioreactor
Extracellular polymeric substances
Fouling
Journal Article
Membranes, Artificial
Microbial community
Sewage
Waste Water

Anmerkungen:

Date Completed 17.06.2020

Date Revised 07.12.2022

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.watres.2020.115843

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM310050502