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Multiple draft tubes airlift loop membrane bioreactor as an efficient system for acidic 7-amino cephalosporanic acid (7-ACA) wastewater treatment
- Source :
- Bioresource Technology. 304:123014
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- In this study, a lab-scale multiple draft tubes airlift loop membrane bioreactor (Mt-ALMBR) was used for treating acidic 7-amino cephalosporanic acid (7-ACA) wastewater under different pHs (3.54–6.20) and hydraulic retention time (HRT) (48 h, 36 h, 24 h and 16 h). During about 200 days operation, under HRT of 48 h and pH condition about 6.0, the optimum average COD and BOD5 removal rates were reach to 84.4 ± 2.1% and 94.9 ± 0.8%, and the highest 7-ACA removal rate also observed as 77.6%. Biodegradation, membrane rejection, hydrolysis and sludge adsorption were the four main pathways of 7-ACA removal. With the increase of pH, biodegradation, membrane rejection and hydrolysis had significant positive impacts on 7-ACA removal, while adsorption had a negative impact. Moreover, mathematical models for 7-ACA removal rate and pH were calculated to guide the operation of Mt-ALMBR. Biodegradation was the main pathway to remove 7-ACA when pH was >4.17.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Chromatography
Sewage
Hydraulic retention time
Renewable Energy, Sustainability and the Environment
Chemistry
Amino Acids, Acidic
Airlift
Bioengineering
General Medicine
Wastewater
010501 environmental sciences
Biodegradation
Membrane bioreactor
Waste Disposal, Fluid
01 natural sciences
Hydrolysis
Bioreactors
Adsorption
Membrane
010608 biotechnology
Waste Management and Disposal
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 304
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....fe85644bed0b1aa47e717e780a5dafef