果汁生产废弃烂果的产甲烷能力及厌氧消化影响因素研究

Methane Production Potential of Fruit Processing Waste and Influence Factors

为了有效处理苹果汁工业生产过程中产生的高碳氮比(C/N=51.4)和低碱度的固体废弃物烂苹果,该研究采用序批式和连续式发酵工艺,评估烂苹果的厌氧消化产甲烷能力,并考察了氮源、碱度的添加和回流工艺对反应体系稳定和产甲烷效率的影响。研究表明,烂果的比甲烷产率可到达472.1 m L·g^(-1)VS。添加40 mg·g^(-1)TSNH_4Cl和50 mg·g^(-1)TS Na_2CO_3可以补充厌氧消化反应中消耗的碱度和氮源,提高反应体系的缓冲能力,并分别提升比甲烷产率11.6%和1.2%。消化污泥的上层固体的回流有助于提高反应效率,实现资源和能量的回收利用,负荷为1.6 g TS·L^(-1)d^(-1)时烂果的比甲烷产率可以达到398.0 m L·g^(-1)VS,提高22.3%,烂苹果中89.9%的能量能以甲烷的形式回收。

Rotten apple is a kind of solid wastes with high C / N ratio and low alkalinity,generated from fruit juice processing industry. The methane production potential of rotten apple was evaluated in batch reactors,and the effect of backflow process,supplement of nitrogen source and alkalinity were investigated in a continuous digester. The results indicated that methane production potential of rotten apple was 472. 1 m L·g-1VS in batch reactor. Specific methane production（ SMP）of rotten apple increased by 11. 6% and 1. 2% after 0. 035 g·g-1TS of NH_4Cl and 0. 05 g·g-1TS of Na2CO3 were supplemented,respectively. Sludge recirculation was beneficial to enhance the digestion efficiency： SMP reached 398. 0 m L· g-1VS at organic loading rate of 1. 6 g TS· L-1d-1,increased by 22. 3% comparing with that without sludge recirculation.And 89. 9% energy could be recovered.