Concentration of Municipal MBBR Effluent by FO for Resource Recovery: Batch Experiments in Side-Stream Configuration
| Autor: | Kamal Azrague, Herman Helness, Edvard Sivertsen, Gema Sakti Raspati, Willy R. Thelin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Forward osmosis
Filtration and Separation 02 engineering and technology Wastewater treatment 010501 environmental sciences lcsh:Chemical technology 01 natural sciences Teknologi: 500 [VDP] Article resource recovery law.invention municipal wastewater law Municipal wastewater nutrient recovery Bioreactor Chemical Engineering (miscellaneous) lcsh:TP1-1185 lcsh:Chemical engineering Effluent Filtration 0105 earth and related environmental sciences Resource recovery Fouling Process Chemistry and Technology forward osmosis Membrane fouling lcsh:TP155-156 021001 nanoscience & nanotechnology Pulp and paper industry Rorward osmosis wastewater treatment Nutrient recovery Wastewater Environmental science 0210 nano-technology |
| Zdroj: | Membranes Membranes, Vol 11, Iss 278, p 278 (2021) Volume 11 Issue 4 |
| ISSN: | 2077-0375 |
| Popis: | A novel approach for resource recovery includes forward osmosis (FO) as a concentration step in municipal wastewater treatment. The current study investigates different pre-treatment strategies including biological treatment with a moving-bed bioreactor (MBBR) at different loading rates and particle removal by filtration and sedimentation. Membrane performance and recovery potential for energy and nutrients were investigated in laboratory-scale FO experiments in batch mode using pre-treated municipal wastewater as feed and 35 g/L NaCl as a draw solution. Initial water fluxes were in the range of 6.3 to 8.0 L/(m2·h). The baseline fluxes were modelled to account for flux decline due to concentration effects and to enable the prediction of flux decline due to membrane fouling. Fouling-related flux decline varied from 0 to 31%. Both organic fouling and precipitation of CaCO3 and CaHPO4 were identified by using SEM–EDS. High-rate flushing resulted in complete flux recovery under most conditions. Scaling could be avoided by lowering the pH. Two operation strategies were tested to achieve this: (1) applying a bioreactor with a low organic loading rate to achieve high nitrification, and (2) adding a strong acid. A low organic loading rate and the use of additional particle removal were efficient measures that reduced organic/particulate fouling. The recovery potentials for COD and phosphorous in FO concentrate were close to 100%. |
| Databáze: | OpenAIRE |
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