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High-rate carboxylate production in dry fermentation of food waste at room temperature.
Science of the Total Environment ( IF 6.551 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.scitotenv.2020.136695
Swakshar Saha,Hyung-Sool Lee

Dry fermentation of food waste was optimized to achieve the maximum solid loading rate for carboxylate production without clogging events in a dry fermenter run at neutral pH. High inoculum-to-substrate ratio improved food waste solubilization and carboxylate yield, but the ratio 15% completely clogged the dry fermenter. Higher leachate circulate rate tended to enhance food waste fermentation, but partial clogging was observed at 13.2 L/h of leachate circulation rate. The dry fermenter achieved carboxylate yield of 428.5 g/kg food waste and volatile solid reduction of 79% at the solid loading rate 4.82 kg volatile solids/m3-d. This study first tracks chemical oxygen demand (COD) in food waste dry fermentation, showing maximum soluble COD <60% of food waste COD with residual food waste 13.6-16.3%. The operating cost was as low as $1.7/ton FW, implying that food waste treatment will be cost-neutral if recovered carboxylate can create economic benefit over the operating cost.
更新日期:2020-01-14

 

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