IMPROVED TRADE WASTE CO-DIGESTION
IMPROVED TRADE WASTE CO-DIGESTION
The combined anaerobic digestion (co-digestion) of municipal wastewater treatment plant biosolids and trade waste (food residuals, selected industrial processing waste and grease trap waste) to biogas and dewatered sludge allows the provision of up to 100% of the heat and power requirements at municipal treatment plants.
Co-digestion of trade waste materials with high fat, oil and grease (FOG) content often results in lower waste procurement/transport costs, a higher methane yield, improved biogas quality and improved commercial viability of the co-digestion plant. However, addition of FOG trade waste increases risks for digester souring, digester foaming and fat deposition in tanks and pipework. Digester operation guidelines for FOG co-digestion therefore recommend low FOG loading rates (< 0.5 kg FOG/m3digester/day).
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