Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7076075 | Bioresource Technology | 2014 | 9 Pages |
Abstract
Anaerobic co-digestion of multiple substrates has the potential to enhance biogas productivity by making use of the complementary characteristics of different substrates. A blending strategy based on a linear programming optimisation method is proposed aiming at maximising COD conversion into methane, but simultaneously maintaining a digestate and biogas quality. The method incorporates experimental and heuristic information to define the objective function and the linear restrictions. The active constraints are continuously adapted (by relaxing the restriction boundaries) such that further optimisations in terms of methane productivity can be achieved. The feasibility of the blends calculated with this methodology was previously tested and accurately predicted with an ADM1-based co-digestion model. This was validated in a continuously operated pilot plant, treating for several months different mixtures of glycerine, gelatine and pig manure at organic loading rates from 1.50 to 4.93Â gCOD/LÂ d and hydraulic retention times between 32 and 40Â days at mesophilic conditions.
Keywords
HRTTKNVFAsRTADM1SRBOLRAcoDCoDsC/SCODtC/NF/MVSsVolatile fatty acidsLinear programmingOptimisationBiogaschemical oxygen demandTotal solidsvolatile solidsSolids retention timehydraulic retention timeSulphate reducing bacteriasoluble chemical oxygen demandAnaerobic Digestion Model No. 1BMPVolatile suspended solidsOrganic loading rateCarbon to nitrogen ratioAnaerobic digestionAnaerobic co-digestionbiochemical methane potentialCodtotal chemical oxygen demandtotal Kjeldahl nitrogen
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Santiago GarcÃa-Gen, Jorge RodrÃguez, Juan M. Lema,