Hydrothermal Hydrolysis of Food Waste and Denitrification Performance of its Liquid-phase Product
To determine the feasibility of liquid-phase product of hydrothermal hydrolysis of food waste for direct use in denitrification of wastewater,the effects of water addition rate,hydrothermal hydrolysis type(static and dynamic)and hy-drolysis duration(0～60 min)on the liquefaction performance of food waste and composition of the liquid-phase product were examined.Moreover,the denitrification performance of the liquid-phase product was compared with that of glucose.The results showed that hydrothermal hydrolysis,especially dynamic hydrothermal hydrolysis could promote the liquefaction of solid-phase organic matter.However,increasing the water addition rate had a limited effect on the liquefaction of food waste.With a 50％water addition rate and a dynamic hydrothermal hydrolysis duration of 20 mins,the liquid-phase prod-uct mainly consisted of carbohydrates and organic acids(73.2％carbohydrates and 11.5％organic acids),the VS propor-tion of the liquid-phase product was 26％and the COD concentration of the liquid-phase product reached 113310 mg·L-1.The total COD of liquid-phase product prepared from 1 kg of food waste reached 88.0 g,and the liquid-phase product had a C/N of 66,which was about double of that of carbon source of anaerobic fermentation solution.Compared to glucose,the liquid-phase product has a similar specific denitrification rate and higher denitrification potential,and can replace glucose as a slow-degrading carbon source for denitrification.
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