Effects of C/N on aerobic composting process and product quality of ceramic-enriched vegetable wastes
The poor structural properties of vegetable wastes are not favorable for their composting process.In this study,the effect of C/N on the aerobic composting process of pottery-enhanced vegetable waste was investigated by using pottery as a structural conditioner.The experiment was set up with four treatments,adjustment of C/N of vegetable wastes with cornstarch.The initial C/N of SP1,SP2,and SP3 were 15,20,and 25,respectively,and the C/N of SP4 without ceramics was 20.The results showed that SP4 above 50℃ lasted only 2 d,SP1-SP3 lasted 8-16 d.Ceramic pellets are beneficial to vegetable waste compost warming,which can significantly accelerate the composting process.SP2 had the fastest and highest warming speed and temperature,above 60℃ for 4 d,and the degradation rate of organic matter was 21.82％,which was also significantly higher than the other groups.The final pH of SP1-SP3 were 8.46,8.19 and 8.00,and the EC value was 3.85,3.78 and 3.79 mS·cm-1,and the C/N was less than 14,of which the final seed germination indices of SP2 and SP3 were 101.1％ and 91.4％,respectively,which reached the requirement of decomposition,and the GI value of SP1 was only 56.7％,which was not fully decomposed.And SP2 and SP3 effectively increased the total nitrogen content of the products compared with SP1,and the final total nitrogen content was 1.42 and 1.55 times of the initial value,respectively.This study showed that vegetable waste plus ceramic compost with initial C/N 20 was the optimal condition,which was conducive to accelerating the degradation and stabilization process of organic matter,and the high heap temper-ature could ensure the safety of the product.
Aerobic compostingVegetable wasteC/NCeramic granuleNitrogen loss
万方数据
维普
