Abstract

PARRA-OROBIO, Brayan Alexis; TORRES-LOZADA, Patricia  and  MARMOLEJO-REBELLON, Luis Fernando. Influence of the mixing ratio on the anaerobic co-digestion of municipal biowaste with domestic wastewater sludge on methane production. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.199, pp.86-93. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n199.57382.

Anaerobic co-digestion (A-Co) is a viable option to overcome the disadvantages of mono-digestion. This research presents the results of biochemical methane potential assays (BMPs) assessing the A-Co of municipal biowastes (MBW) from one city which perform source separation and selective collection with domestic wastewater sludge (DWS) from a municipal wastewater treatment plant (WWTP) in different DWS: MBW mixing ratios. Besides methane production, it was evaluated the hydrolysis (through a first-order kinetics model and the modified Gompertz model), since this is the limiting step of the A-Co of solid wastes. The results showed that A-Co of DWS with MBW is feasible and that DWS: MBW mixing ratio generated a synergistic effect in the process. The mixing ratio DWS:MBW that produced the largest quantities of methane (105.6 mLCH₄·gVS^-1), optimal hydrolysis constants (K_h) and shortest lag phase (under 3.3 days) was 20:80.

Keywords : Anaerobic co-digestion; Hydrolysis; Municipal biowaste; Primary sludge; Renewable energy.

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