Synergistic co-digestion of solid-organic-waste and municipal-sewage-sludge: 1 plus 1 equals more than 2 in terms of biogas production and solids reduction

摘要: Making good use of existing water infrastructure by adding organic wastes to anaerobic digesters improves the energy balance a wastewater treatment plant (WWTP) substantially. This paper explores co-digestion load limits targeting trade-off for boosting methane production, and limiting process-drawbacks on nitrogen-return loads, cake-production, solids-viscosity polymer demand. Bio-methane potential tests using whey as model co-substrate showed diversification intensification digestion process resulting in synergistical enhancement sewage sludge methanization. Full-scale case-studies demonstrate addition up 94% resulted tripling biogas production. At 25% no significant increase cake production only minor ammonia release ca. 20% have been observed. Similar impacts were measured at high-solids digester pilot with up-stream thermal hydrolyses where loading rate was increased co-substrate. Dynamic simulations used validate synergistic impact methanization, an hydrolysis from 1.5 d(-1) 2.5 identified simulating gas rate. study demonstrates maximizing synergy step towards efficiency ultimately carbon neutrality.