Anaerobic digestion of food waste with aerobic post-treatment: Effect of fruit and vegetable content
| Autor: | Elsy Ibrahim, Charbel Abou Khalil, Sophia Ghanimeh |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Sewage 020209 energy Chemical oxygen demand 02 engineering and technology 010501 environmental sciences Total dissolved solids 01 natural sciences Pollution Ammonia chemistry.chemical_compound Food waste Anaerobic digestion Bioreactors chemistry Fruit Vegetables 0202 electrical engineering electronic engineering information engineering Anaerobiosis Food science Psychrophile Methane Anaerobic exercise 0105 earth and related environmental sciences Mesophile |
| Zdroj: | Waste Management & Research: The Journal for a Sustainable Circular Economy. 36:965-974 |
| ISSN: | 1096-3669 0734-242X |
| DOI: | 10.1177/0734242x18786397 |
| Popis: | A mesophilic anaerobic digester, followed by a psychrophilic aerobic post-treatment, was used to treat food waste (FW) with different proportions of fruit and vegetable waste (FVW). Two types of FW were used: low fruit and vegetable mix (LFV, with 56.5% of FVW) and high fruit and vegetable mix (HFV, with 78.3% of FVW). The anaerobic digester fed with LFV failed at an organic loading rate of 1.6 g VS.L-1.d-1 (volatile fatty acid (VFA) = 6000 mg.L-1) due to high ammonia (reaching 3000 mg.L-1). It was shown that, in an unstable anaerobic environment, ammonia is highly correlated ( r2 = 0.77) with VFA and is negatively correlated with volatile solids, total solids, and chemical oxygen demand (COD) removal rates ( r2 = 0.88, r2 = 0.71, and r2 = 0.91, respectively). In contrast, the anaerobic digester fed with HFV exhibited a stable performance (VFA = 1243 mg.L-1), with limited ammonia accumulation (940 mg.L-1). Methane generation was affected by the FVW content and reached 531 ml CH4.g VS-1 (CH4 = 52%) with LFV feed and 478 ml CH4.g VS-1 (CH4 = 57.4%) with HFV. The overall TS, VS and COD removal rates (all ranging between 94% and 97%), were closely similar for LFV and HFV. Accordingly, the aerobic post-treatment seems to compensate for the reduced performance of the disturbed anaerobic system fed with LFV. |
| Databáze: | OpenAIRE |
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