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Operating Conditions Optimization via the Taguchi Method to Remove Colloidal Substances from Recycled Paper and Cardboard Production Wastewater
- Source :
- RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia, instname, Membranes, Vol 10, Iss 170, p 170 (2020), Membranes, Volume 10, Issue 8
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- Optimization of the ultrafiltration (UF) process to remove colloidal substances from a paper mill&rsquo<br />s treated effluent was investigated in this study. The effects of four operating parameters in a UF system (transmembrane pressure (TMP), cross-flow velocity (CFV), temperature and molecular weight cut-off (MWCO)) on the average permeate flux (Jv), organic matter chemical oxygen demand (COD) rejection rate and the cumulative flux decline (SFD), was investigated by robust experimental design using the Taguchi method. Analysis of variance (ANOVA) for an L9 orthogonal array were used to determine the significance of the individual factors, that is to say, to determine which factor has more and which less influence over the UF response variables. Analysis of the percentage contribution (P%) indicated that the TMP and MWCO have the greatest contribution to the average permeate flux and SFD. In the case of the COD rejection rate, the results showed that MWCO has the highest contribution followed by CFV. The Taguchi method and the utility concept were employed to optimize the multiple response variables. The optimal conditions were found to be 2.0 bar of transmembrane pressure, 1.041 m/s of the cross-flow velocity, 15 &deg<br />C of the temperature, and 100 kDa MWCO. The validation experiments under the optimal conditions achieved Jv, COD rejection rate and SFD results of 81.15 L&middot<br />m&minus<br />2&middot<br />h&minus<br />1, 43.90% and 6.01, respectively. Additionally, SST and turbidity decreased by about 99% and 99.5%, respectively, and reduction in particle size from around 458&ndash<br />1281 nm to 12.71&ndash<br />24.36 nm was achieved. The field-emission scanning electron microscopy images under optimal conditions showed that membrane fouling takes place at the highest rate in the first 30 min of UF. The results demonstrate the validity of the approach of using the Taguchi method and utility concept to obtain the optimal membrane conditions for the wastewater treatment using a reduced number of experiments.
- Subjects :
- Optimization
Materials science
Ultrafiltration
Filtration and Separation
02 engineering and technology
lcsh:Chemical technology
Article
INGENIERIA QUIMICA
Taguchi methods
Paper mill treated effluent
020401 chemical engineering
Chemical Engineering (miscellaneous)
lcsh:TP1-1185
0204 chemical engineering
Turbidity
lcsh:Chemical engineering
Fouling
Process Chemistry and Technology
Chemical oxygen demand
Membrane fouling
lcsh:TP155-156
021001 nanoscience & nanotechnology
Rejection rate
Pulp and paper industry
12.- Garantizar las pautas de consumo y de producción sostenibles
DoE
Taguchi method
Particle size
0210 nano-technology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia, instname, Membranes, Vol 10, Iss 170, p 170 (2020), Membranes, Volume 10, Issue 8
- Accession number :
- edsair.doi.dedup.....9e3123768befc818a24826bdb4ade469