ANALYSIS OF EFFECT OF ADDITION OF CHINESE HERBAL RESIDUE ON FOOD WASTE COMPOSTING BASED ON EEM AND HIGH-THROUGHPUT SEQUENCING

Using Chinese herbal residue as a conditioner and an external carbon source, the effect of different quality ratios on the composting process of food waste and municipal sludge were investigated by EEM spectra. In addition, the microbial communities in different piles were analyzed by using high throughput sequencing technology. The results of the EEM spectra showed that the addition of Chinese herbal residue accelerated the maturity process of composting. With the increase of the dosage, the effect was continuously enhanced. According to high throughput sequencing analysis, with the increase of the dosage of Chinese herbal residue, the microbial biodiversity in the piles gradually decreased, but the microbial community richness increased. The relative abundance of Proteobacteria decreased by adding Chinese herbal residue, while the relative abundance of Firmicutes increased. Meanwhile, adding a weight ratio 5% of Chinese herbal residue could improve the number of Clostridia, so as to promote the decomposition of cellulose in the piles, and avoid the local hardening of the piles caused by the excessive addition of Chinese herbal residue. In general, the addition of 5% Chinese herbal residue had best promoting effect on the composting process of food waste and municipal sludge.