Fouling analysis of membrane bioreactor treating antibiotic production wastewater at different hydraulic retention times
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Abstract
Membrane fouling, including foulants and factors, was investigated during hydraulic retention time (HRT) optimization of a membrane bioreactor (MBR) that treated wastewater from the production of antibiotics. The results showed that HRT played an important role in membrane fouling. Trans-membrane pressure (TMP), membrane flux, and resistance were stable at −6 kPa, 76 L m−2 h−1 bar−1, and 4.5 × 1012 m−1 when HRT was at 60, 48, and 36 h, respectively. Using Fourier transform infrared spectroscopy, foulants were identified as carbohydrates and proteins, which correlated with effluent organic matter and effluent chemical oxygen demand (COD) compounds. Therefore, membrane fouling trends would benefit from low supernatant COD (378 mg L−1) and a low membrane removal rate (26 %) at a HRT of 36 h. Serious membrane fouling at 72 and 24 h was related to soluble microbial products and extracellular polymeric substances in mixed liquor, respectively. Based on the TMP decrease and flux recovery after physical and chemical cleaning, irremovable fouling aggravation was related to extracellular polymeric substances’ increase and soluble microbial products’ decrease. According to changes in the specific oxygen uptake rate (SOUR) and mixed liquor suspended solids (MLSSs) during HRT optimization in this study, antibiotic production wastewater largely inhibited MLSS growth, which only increased from 4.5 to 5.0 g L−1 when HRT was decreased from 72 to 24 h, but did not limit sludge activity. The results of a principal component analysis highlighted both proteins and carbohydrates in extracellular polymeric substances as the primary foulants. Membrane fouling associated with the first principal component was positively related to extracellular polymeric substances and negatively related to soluble microbial products. Principal component 2 was primarily related to proteins in the influent. Additional membrane fouling factors included biomass characteristics, operational conditions, and feed characteristics.
Keywords
Fouling Foulant HRT Effluent organic matter Extracellular polymeric substances Soluble microbial product Correlation analysis Principal component analysisNotes
Acknowledgments
Financial support from the Major Science and Technology Program for Water Pollution Control and Treatment of China (Nos. 2012ZX07203-002 and 2015ZX07203-005) is highly appreciated, as is support from the National High-Technology Research and Development Program (“863” Program) of China (No. 2009AA063901).
Author contributions
Yutao Chen contributes equally with Dawei Yu. All authors contributed to the writing of this manuscript and have approved the final version of this manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Supplementary material
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