间歇式曝气与人工翻堆对堆肥化进程的影响

利用间歇式曝气方式,控制堆肥堆体内氧气体积分数调节堆体内有氧/无氧交替周期,与翻堆方式比较,考察不同发酵模式对堆肥化进程及堆肥性质的影响.结果表明:间歇式曝气和翻堆方法均能有效提升堆体内氧气体积分数(翻堆后可使堆体内氧气体积分数达18.5％,曝气可使堆体内氧气体积分数达15.5％).但曝气和翻堆结束后,堆体内的氧气会迅速下降,翻堆方式在27 min内耗尽氧气,间歇式曝气方式在24 min内耗尽氧气.在堆肥化过程中,间歇式曝气与翻堆相比,堆体温度提前约10 d达到室温；堆体含水量提前约18d达到稳定状态；间歇式曝气能够促进堆肥pH快速恢复至中性.堆肥化结束后,间歇式曝气方式与翻堆方式分别使堆肥物料减少51.3％和44.6％(质量分数)；总氮含量分别稳定在1.66和1.62 mg/g.可见,间歇式曝气与传统翻堆方式相比,能够促进堆肥快速达到稳定状态,缩短腐熟周期.且比连续曝气节约能源.

Effects of intermittent aerating and pile-turning on composting process

The purpose of the study is to explore the effects of different fermentation modes on the composting process and compost quality,using intermittent aeration mode,regulating aerobic fermentation and anaerobic fermentation time and alternate cycles in the compost through the control of oxygen content of the compost,and taking investigation of compost property changes,compared with pile-turn treatment.The results showed that both of the intermittent aerating and manual pile-turning treatments can increase oxygen content of the compost effectively (in the pile-turning mode,the oxygen content of the compost got up to 18.5%,and the oxygen content got up to 15.5% in the intermittent aeration mode),but at the end of the aerating or turning treatments,the oxygen content decreased rapidly,the oxygen of compost body can be depleted within 27 minutes by using the manual turning mode,and within 24 minutes by using the intermittent aeration mode.During the composting process,comparing with the turning treatment,the composting temperature reached room temperature about 10 days in advance by using the intermittent aerating treatment,and the moisture content of landfill reached a steady state about 18 days in advance.The intermittent aeration treatment can promote composting pH to be a neutral state in the mid and late composting process.At the end of the composting,the composting material decreased 51.3% and 44.6% by using the intermittent aeration treatment and the overturn treatment respectively,and the total nitrogen content was found to be stable at 1.66 mg/g and 1.62 mg/g respectively with the above two treatments.Therefore,compared with traditional turning mode,the intermittent aeratiing treatment can promote the compost to reach a steady state quickly,shorten the maturity cycle,and save energy compared with continuous aeration treatment.