Abstract
Rotating disk membrane (RDM) module with ultrafiltration (UF) was an effective alternative method to treat alfalfa wastewater and realize protein recovery and agricultural irrigation water production. A scientific investigation has been conducted to comprehend the effect of operation conditions (feed flow rate, shear rate, transmembrane pressure (TMP), and temperature) on alfalfa wastewater treatment with RDM-UF by central composite response surface methodology (CCRSM). First, the filtration behaviors of three types of UF membranes (PES20, UH030P, and PES50) were studied to select the optimized membrane (UH030P). Then, the effects and interactions of four operation conditions were studied and fitting models were established, while data on pollution reduction and protein recovery, membrane fouling behavior, and energy cost evaluation were collected. Furthermore, the optimized operation conditions calculated by CCRSM were Q = 60 L h−1, γ = 220 × 103 s−1, TMP = 5.61 bar, and T = 25 °C. In addition, the concentration test was conducted with these parameters. This work may contribute to the potential application of RDM for membrane wastewater treatment.
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Funding
The authors would like to acknowledge the Guangdong Natural Science Foundation of China (Grant Number 2017A030310540), Guangdong Provincial Education Department Youth Innovative Talents Project (Grant 17ZK0110), and Scientific Research Fund of Guangdong University of Technology (Grant 220413582).
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Zhang, W., Grimi, N., Jaffrin, M.Y. et al. Optimization of RDM-UF for alfalfa wastewater treatment using RSM. Environ Sci Pollut Res 25, 1439–1447 (2018). https://doi.org/10.1007/s11356-017-0588-8
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DOI: https://doi.org/10.1007/s11356-017-0588-8