Evaluation of performance and economic benefit of vegetable waste circulation composting
Vegetable waste has high water content.A large number of high carbon and low water auxiliary materials need to be added in the composting process for adjustment,resulting in high production cost and low resource utilization rate.In order to develop the aerobic composting process system suitable for consuming vegetable waste with high water content and promote the efficient resource utilization of waste,an experiment with traditional aerobic composting and recycling composting was conducted.The performance of vegetable waste recycling composting was studied,and the feasibility and economic benefits of the process were evaluated.The results showed that in the first and second cycle,the performance of the composting was stable,and the temperature of the pile was rapid,and the high temperature period lasted for 10 and 5 days,respectively.In the third cycle,the stability of the system began to fluctuate,and the ≥50℃ temperature was remained for 5 days.In the fourth cycle,the composting system deteriorated and the heap could not reach 50℃,which terminated the cycle process.The final pH value of the recycled composts material was 6.72,the EC value was 3.43 mS·cm-1,and the seed germination index was 72.0％,which met the requirements of the harmless standard and did not cause toxicity to plants.The recycling composting can dehydrate vegetable waste rapidly,and keep the water of the pile in the optimal range of 50％-60％to facilitate the degradation of organic materials.The highest degradation rates of the four recycling for vegetable waste were 92.9％,88.6％,59.4％,21.7％,respectively.The economic benefit analysis showed that,compared with conventional composting,the amount of auxiliary materials and cost of recycling composting were reduced by 48.8％.At the same time,adding the same amount of auxiliary materials,recycling composting could absorb more vegetable waste,and its profit was 7.15 times that of conventional composting.In conclusion,the process of recycling composting is feasible and stable,the maximum number of cycles is three times,the amount of auxiliary materials is less,and the profit is high.It is an economical and feasible technology for the treatment of vegetable waste with high water content.
万方数据
维普
