餐厨垃圾固相物料与厨余垃圾混合中温厌氧消化工程中试研究

Pilot-scale Study on Mesophilic Anaerobic Co-digestion of Solid-phase Material of Food Waste and Kitchen Waste

试验采用有效容积为4 m^3的全混式反应器,在中温(35℃)的条件下,分别进行了单一餐厨垃圾固相物料(S1)、餐厨垃圾固相物料(S1)与厨余垃圾(S2)的混合物料(S3)(混合比为2∶1)厌氧消化工程中试。结果表明,单一餐厨垃圾固相物料(S1)厌氧消化最佳运行工况为进料有机负荷(OLR)为80 kg·d^(-1),停留时间(HRT)为50 d;当OLR增至115 kg·d^(-1)时,其平均容积产气率由2.04 m^3·m^(-3)d^(-1)降至2.02 m^3·m^(-3)d^(-1),气体甲烷含量由61.1%降至38.4%。混合物料(S3)日进料量由80 kg提升至120 kg时,平均容积产气率由2.11 m^3·m^(-3)d^(-1)升高至2.30 m^3·m^(-3)d^(-1),甲烷含量亦由61.9%升高至63.8%。因此,将餐厨垃圾固相物料与厨余垃圾进行混合可以有效改善物料厌氧性能,其有机负荷以及甲烷产率均表现出明显优势。

Under mesophilic condition(35℃),pilot-scale experiments on anaerobic digestion with sole solid phase material of food waste and mixed with kitchen waste(mixing ratio 2∶1)were carried out respectively,using a 4 m^3 full mixed reactor.The results showed that when the feedstock was the sole solid phase material of food waste,optimum operating condition was OLR of 80 kg·d^-1,HRT of 50 d.When the OLR increased to 115 kg·d^-1,the average volumetric gas production rate decreased from 2.04 m^3·m^-3 d^-1 to 2.02 m^3·m^-3 d^-1,and the methane content decreased from 61.1%to^38.4%.When the feedstock was the mixture,and when the OLR increased from 80 kg·d^-1 to 120 kg·d^-1,the average volumetric gas production rate increased from 2.11m^3·m^-3 d^-1 to 2.3 m^3·m^-3 d^-1,the methane content increased from 61.9%to 63.8%.Therefore,co-digestion could improve the anaerobic digestion performance of food waste and kitchen waste with both OLR and the methane content increased obviously.