Effect of Particle Size on Anaerobic Fermentation Process of Vegetable Waste
A large amount of vegetable waste generated in vegetable circulation is in urgent need of harmless treatment.However,the existing"crushing+pressing+anaerobic/aerobic"treatment process used in the large-scale treatment of vegetable waste is prone to anaerobic fermentation acidification.In order to solve this problem,in the analysis of the exist-ing large-scale treatment process of vegetable waste,it was found that excessive fragmentation was the main cause of anaero-bic fermentation acidification.Because anaerobic fermentation with vegetable waste as the main raw material,acidification phenomenon often occurred due to excessive accumulation of organic acids in the system,resulting in gas production fail-ure.In order to further study the effect of particle size on the anaerobic fermentation process of vegetable waste and improve its energy efficiency,Chinese cabbage was selected as the test substrate and the effects of different particle sizes of Chinese cabbage(2 cm square pieces,whole leaves,1/4 head of cabbage)on the biogas production performance were compared under high organic load.The results show that small particle size can lead to acidification.The cumulative gas production was 68.1 L and 69.2 L,respectively,when the grain size was whole and 1/4 head,and the fermentation process was in a stable state.The acidizing gas production of the 2 cm small group was stopped,and the basic indexes were stagnated or ac-cumulated.The experiment can provide data reference for rapid processing of vegetable waste in scale.
vegetable waste treatment and utilizationparticle sizeanaerobic digestionacid inhibition