Efficient resource valorization by co-digestion of food and vegetable waste using three stage integrated bioprocess
| Autor: | Debkumar Chakraborty, S. Venkata Mohan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Acidogenesis Environmental Engineering Methanogenesis Zero waste Bioengineering 010501 environmental sciences engineering.material 01 natural sciences Methane chemistry.chemical_compound Bioreactors 010608 biotechnology Vegetables Biohydrogen Waste Management and Disposal 0105 earth and related environmental sciences Resource recovery Renewable Energy Sustainability and the Environment Compost Hydrolysis General Medicine Pulp and paper industry Fatty Acids Volatile Food waste chemistry Food engineering Carbohydrate Metabolism |
| Zdroj: | Bioresource technology. 284 |
| ISSN: | 1873-2976 |
| Popis: | During two-stage (Acidogenesis-Methanogenesis) process, solid organics and gaseous by-products are usually left unused. To increase resource recovery efficiency, a three stage process (Hydrolysis/Acidogenesis-Methanogenesis-Composting) was designed. Initially, co-digestion of food waste (FW) and vegetable waste (VW) was carried out in Leach Bed Reactor (LBR) for hydrolysis and acidogenesis, followed by airlift reactor (ALR) for methanogenesis for 21 days using two different feed stocks [2:3 FW:VW~FVW; FW alone]. Off gas from LBR was diverted to ALR to enhance methane recovery. Results depicted that volatile fatty acids (VFA) and biohydrogen production was more for FW fed system, while methane production was higher in FVW fed system. Three different functional zones in three separate chambers significantly accelerated organic removal rate while gas diversion increased overall methane recovery. In third stage, residual solid organic matter from LBR was subjected to aerobic composting and compost with N (%): 2.90 & 2.76; C/N ratio: 18.2 & 20.8 for FVW and FW was recovered. The three-stage process has advantages of zero waste generation and overall process stability, accounting for resource efficient circular loop. |
| Databáze: | OpenAIRE |
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