鸡粪和玉米秸秆混合干发酵制微藻培养液膨胀特性分析

Swelling Characteristics of Microalgae Culture Medium from Chicken Manure and Corn Straw Mixed by Dry Fermentation

摘要: 为提高厌氧消化系统产沼气性能，本实验通过研究在鸡粪中添加不同配比的玉米秸秆(0%、10%、20%)进行连续的厌氧发酵实验，研究了不同配比的玉米秸秆对甲烷产率等常规参数变化的影响，对其物料膨胀率、pH和VFAs变化趋势、产气特性进行分析得出最适合实际生产的物料组成。研究结果表明：10%玉米秸秆添加组获得最大甲烷的溶积产气量为227.66 ml/gVS，较纯鸡粪实验组累计产甲烷量提高了18%，且相较于20%玉米秸秆添加组拥有更低的污泥膨胀率。玉米秸秆的添加可明显提升鸡粪物料的甲烷含量和甲烷产率，在鸡粪的发酵过程中添加少量秸秆有助于调节C/N，调节微生物的营养结构以及防止氨抑制现象的产生，提高产气效率。但是随着玉米秸秆添加量增高，会使整个厌氧发酵周期变长，降低了原料的利用率，所以在实际工程应用中10%玉米秸秆添加量为最佳配比。

Abstract: In order to improve the biogas production performance of the anaerobic digestion system, this experiment conducted continuous anaerobic fermentation experiment by adding different propor-tions of corn straw (0%, 10%, 20%) to chicken manure, and studied the influence of different pro-portions of corn straw on the change of methane yield and other conventional parameters. The ex-pansion rate, pH and VFAs variation trend, gas production characteristics of the material were ana-lyzed to get the most suitable material composition for actual production. The results showed that the maximum soluble gas production of methane was 227.66 ml/gVS in the 10% corn straw group, which increased the cumulative methane production by 18% compared with that in the pure chick-en manure group, and the sludge bulking rate was lower than that in the 20% corn straw group. The addition of corn straw can significantly increase the methane content and methane yield of chicken manure materials. Adding a small amount of corn straw in the fermentation process of chicken manure is helpful to regulate C/N, regulate the nutrient structure of microorganisms, prevent the occurrence of ammonia inhibition phenomenon, and improve the gas production efficiency. However, with the increase of corn straw addition, the whole anaerobic fermentation cycle will become longer and the utilization rate of raw materials will be reduced. Therefore, 10% corn straw addition is the best proportion in practical engineering application.