EFFECTS OF OIL ON HUMIFICATION PROCESS OF AEROBIC COMPOSTING OF KITCHEN WASTE
As an important component of kitchen waste,oil has an important influence on kitchen waste composting.In this study,0％(T1),3％(T2),6％(T3),and 12％(T4)vegetable oil were added to the kitchen waste for aerobic composting.The amount of oil added was based on the dry weight of the kitchen waste added to the compost.The effects of oils on the humification of kitchen waste aerobic composting were studied by characterizing the changes in physical and chemical properties,humic acid components,and humic acid precursors in the composting process.The results showed that:After 30 days of aerobic composting of the kitchen waste with different concentrations of oil,the compost of different treatment groups reached the requirements of decomposition,and the highest temperature was 70.9 ℃,64.8 ℃,65 ℃ and 67.2 ℃,respectively.The high-temperature period of compost reached more than 7 days.The germination rates of seeds were 119.22％,113.50％,114.03％,and 120.52％,respectively.In the T2,T3,and T4 treatment groups,oil accumulation occurred at high temperatures,and the highest oil content was 1.66 times,1.99 times,and 1.76 times the initial oil content.On the 30th day of composting,the HA/FA ratio of the four treatment groups was 0.55,0.70,0.80,and 1.30,respectively.The HA/FA ratio was the highest when the oil content was 12％,indicating that the humification degree of compost was the strongest when the oil content was 12％.Adding 12％oil can prolong the high-temperature period of compost and promote the formation of precursors,thus promoting the humification process of compost.The results of redundancy analysis showed that the content of oil was positively correlated with the formation of humic acid precursors and humus components.In conclusion,when the oil content is 12％of the dry weight of food waste,the degradation of oil has the best effect on the humification process of kitchen waste aerobic compost.
kitchen wasteoilaerobic compostingumification process
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