Strategy for Flux Enhancement in Biofilm Ceramic Membrane Bioreactor Applying Prepolymerized and Non-Prepolymerized Inorganic Coagulants
| Autor: | Olga Kulesha, Knut Kvaal, Zakhar Maletskyi, Harsha Ratnaweera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:Hydraulic engineering
multivariate statistics Geography Planning and Development 02 engineering and technology factorial experimental design 010501 environmental sciences Aquatic Science Membrane bioreactor 01 natural sciences Biochemistry law.invention Membrane technology lcsh:Water supply for domestic and industrial purposes 020401 chemical engineering law lcsh:TC1-978 coagulants Bioreactor Coagulation (water treatment) 0204 chemical engineering Filtration 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 Fouling Chemistry membrane fouling Membrane fouling biofilm membrane bioreactor Ceramic membrane Chemical engineering membrane flux enhancement |
| Zdroj: | Water, Vol 11, Iss 3, p 446 (2019) Water Volume 11 Issue 3 |
| ISSN: | 2073-4441 |
| Popis: | Considering new legislative and economic restrictions caused by the water crisis, this work focuses on a more efficient wastewater treatment process, which combines biological treatment in a moving bed biofilm system with a membrane bioreactor (BF-MBR) and coagulation, particularly addressing fouling alleviation in the separation stage. The study justifies the positive impact of coagulant dosing in BF-MBR regarding membrane flux and fouling rate. Statistical techniques connect the results of coagulation and membrane separation experiments with properties of mixed liquor, obtained after biotreatment in the representative pilot plant and characteristics of prepolymerized and non-prepolymerized inorganic coagulants. Research results substantiate the need for a pH-controlled coagulation of mixed liquor in BF-MBR depending on coagulant type, which influences charge, hydrophobicity and size of flocs and organic content of the system. It is suggested, that the adsorption/charge neutralization mechanism dominates in flux enhancement in BF-MBR, giving the best results in the case of prepolymerized aluminium coagulants. Together with high quality of permeate, the application of prepolymerized aluminium chloride of medium basicity entails a tenfold increase in filtration time of the membrane separation cycle and increases net membrane flux by 30–56%. The results of the study are practically significant for the development of an automated control system for BF-MBR, optimizing treatment rates together with membrane separation efficiency. |
| Databáze: | OpenAIRE |
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