有机生活垃圾多组分联合厌氧降解产甲烷性能研究

Impact of combined anaerobic degradation of multi-component organic domestic waste on methane production performances

为了阐明生活垃圾多组分的混合对其厌氧降解产气性能的影响,通过在中温(37±1)℃下对餐厨类、纸类和园林类垃圾组分进行单独和联合厌氧降解产甲烷实验,研究接种物来源对单组分和多组分物料厌氧降解产甲烷性能的影响,应用修正的Gompertz模型拟合和分析物料产甲烷过程动力学特征,并借鉴和发展评价混合物料联合厌氧降解性能的量化指标方法.试验与模型拟合结果均表明:接种物来源对各组分及其组合的厌氧生物可降解程度无显著影响,但对其降解速率存在明显影响.此外,尽管物料的混合对试验初期物料降解产甲烷速率存在促进作用,但仅有3组分混合试验组在最终累计甲烷产率方面表现出显著的协同促进,在2种接种物条件下,相比于3组分单独降解的甲烷产率分别增长了16%和14%.

In order to clarify whether the multi-component mixture of municipal solid waste may have an impact on its methane production performance, effects of inoculum sources on the anaerobic degradation of single and multi-component materials were studied by conducting biochemical methane potential (BMP) experiments on food waste (FW), newspaper (NP) and branch (BR) at mesophilic temperature (37±1)°C. The modified Gompertz model was used to fit and analyze the kinetic characteristics of the methanogenesis process, and a quantitative index method was developed to evaluate the impact on co-degradation performance. The results of experiments and model fitting exercises showed that the inoculum source had no significant effect on the biodegradability of single and multi-component materials, but had significant effect on its degradation rate. In addition, although the mixing of the components promoted the rate of degradation at the initial stage of the test, only the tri-component mixture test group showed a significant synergistic promotion in the final cumulative methane yield, and the methane yield increased by 16% and 14%, respectively, compared with the mono- degradation of materials with two different inocula.