Abstract
The organic fraction of the municipal solid waste is not being properly utilized and is disposed in open dumps which leads to environmental pollution. The vegetable market wastes degrade rapidly than other municipal solid waste. In our earlier report, we concluded that single-stage anaerobic digestion systems could not be operated with higher loading rates for the digestion of vegetable market wastes (VMW). Hence, in this investigation, we proposed anaerobic digestion of VMW in a two-phase semi-continuous anaerobic reactor. In this study, the effect of organic loading rates (OLR) and hydraulic retention time (HRT) in methanogenic reactors was investigated. It was found that the specific biogas production increased with an OLR from 1.5 to 4.5 gVS/L/d and decreased with further increase in OLR. Maximum specific biogas production and methane yield of 0.721 ± 0.010 L/gVSadd and 0.469 LCH4/gVSadd were obtained at OLR of 4.5 gVS/L/d and a 25-day HRT in methanogenic reactor. Kinetic parameters of maximum yield and specific growth rate were evaluated by Chen–Hashimoto model.
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Abbreviations
- FVW:
-
Fruit vegetable wastes
- MSW:
-
Municipal solid wastes
- VMW:
-
Vegetable market wastes
- LFG:
-
Landfill gas
- HRT:
-
Hydraulic retention time (day)
- OLR:
-
Organic loading rate (gVSL−1d−1)
- TS:
-
Total solids (%)
- VS:
-
Volatile Solids (%)
- VFA:
-
Volatile fatty acids (gL−1)
- S :
-
Effluent substrate concentration (mg/L)
- S o :
-
Influent substrate concentration (mg/L)
- θ :
-
Hydraulic retention time (days)
- k :
-
Dimensionless kinetic constant
- μ max :
-
Maximum specific growth rate per day
- Y :
-
Actual biogas yield at STP (L/gVSadd)
- Y ∞ :
-
Theoretical maximum methane yield at STP (L/gVSadd)
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The authors thank the Director, CLRI, Chennai, and Management of GKM College of engineering and Technology in carrying out the research work for the support and for granting permission to publish the work.
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Dhanalakshmi Sridevi, V., Rema, T. & Srinivasan, S.V. Studies on biogas production from vegetable market wastes in a two-phase anaerobic reactor. Clean Techn Environ Policy 17, 1689–1697 (2015). https://doi.org/10.1007/s10098-014-0883-8
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DOI: https://doi.org/10.1007/s10098-014-0883-8