In the research, pot experiment and field testing were conducted to study the effect of different crops, soil types, and irrigation modes on biogas slurry diges- tions. The results showed that when silage maize, sweet sorghum and Chinese cabbage were planted in purple soils, the quantities of digested biogas slurry were of 57, 157.5, and 34.5 t/hm2, respectively, while the quantities of digested biogas slurry were 70.5, 157.5 and 40.5 t/hm2 in yellow soils. Besides, the digested biogas slurries reached 36 and 27 t/hm2 as per flood irrigation and sprinkling irrigation when Chinese cabbages were planted in yellow soils. The research indicated crop variety, soil type, and irrigation method all have effects on farmland digestion of biogas slurry.
在恒温35℃和料液中ω(总固体)为5%的条件下,以农村餐厨垃圾及碱液预处理后的玉米秸秆为原料,以实验室内培养的不产气厌氧活性污泥为接种物,研究餐厨垃圾与玉米秸秆不同配比(干物质质量比分别为1∶3、1∶2、1∶1、2∶1、3∶1和1∶0)混合发酵对产气效果的影响。结果表明,餐厨垃圾与玉米秸秆以1∶2配比的处理CH4累积产量最大,平均为12 741 m L,挥发性固体(VS)CH4产率为299.9 m L·g-1。对发酵过程中p H值的测定结果表明,餐厨垃圾与玉米秸秆混合厌氧消化可以提高厌氧消化系统的缓冲性和稳定性。修正的冈珀茨模型(Gompertz)能较好地拟合餐厨垃圾-玉米秸秆混合发酵产CH4过程,并且伴随秸秆比率的提高,发酵延滞期和周期逐渐缩短。因此,在餐厨垃圾中加入秸秆可有效提高餐厨垃圾厌氧消化的产气率和生物降解效率。
