青岛市餐厨垃圾与菜市场垃圾混合高温厌氧消化研究

在中试规模下,研究青岛市餐厨垃圾与菜市场垃圾混合(质量比1∶1)高温厌氧消化实验,通过监测厌氧消化过程中产气量、气体组成等产气情况和消化液中pH值、SCOD、NH3-H、VFAs含量和组分等化学指标变化,确定混合厌氧消化的最大有机负荷,并分析混合高温厌氧消化技术的可行性,结果表明,(1)青岛市餐厨垃圾与菜市场垃圾混合高温厌氧消化产甲烷具有技术可行性;(2)混合厌氧消化的最大有机负荷可达4.069 kg VS/(m3.d);(3)当系统最大有机负荷时,每天每千克VS最高可产生甲烷量0.346 m3;(4)混合厌氧消化可削减氨氮对餐厨垃圾单独厌氧消化产沼气的影响。

Study on thermophilic anaerobic digestion of mixture of kitchen wastes and vegetable market wastes in Qingdao

In the pilot scale,the thermophilic anaerobic digestion of the mixture of kitchen wastes and vegetable market wastes(mass ratio=1:1)was studied. In anaerobic digestion process,chemical index changes of pH value,soluble COD(SCOD),volatile fatty acids(VFAs) and ammonia in digested liquid and gas situation like gas output and gas composition were monitored. Moreover,the biggest organic load of mixture of kitchen wastes and vegetable market wastes and the technical feasibility of anaerobic digestion of the mixture were also determined and analyzed. The results showed that(1)Anaerobic digestion of the mixture was technical feasible in Qingdao.(2)The maximum organic loading of the mixture system achieved 4.069 kg VS/(m³·d).(3)In the mixture system,0.346 m³ CH₄ were generated by one kilogram VS per day in the maximum organic loading condition.(4)Physio-chemical index and gas situation were not affected remarkable by ammonia in the mixture anaerobic digestion process compared with the food waste anaerobic digestion process.