pH值调控对餐厨垃圾厌氧消化效率的影响

Effect of pH Modification on Anaerobic Digestion of Kitchen Wastes

该试验对pH值调控对餐厨垃圾厌氧消化效率的影响进行了研究。在恒温(35℃)条件下,考察不同pH值(5,6,7,8)对餐厨垃圾厌氧消化过程的影响。结果表明:pH值调控对餐厨垃圾厌氧消化产气影响显著。当pH值为7.0时,餐厨垃圾厌氧发酵产沼气效率较好,产甲烷菌群活性较高,累计产气量达到3692mL,甲烷含量达到55%以上。pH值调控对维持餐厨垃圾厌氧消化系统稳定性有利。各处理在pH值的调控下趋于稳定,产甲烷菌群活性较高,反应体系运行平稳。VFAs中乙酸含量占60%以上,当pH值为7时,乙酸与丁酸所占组分百分比最高,达到77%。对消化液中氨氮的分析表明,经pH值调控后,厌氧消化系统未出现氨氮抑制现象。

Effects of pH on anaerobic digestion of kitchen wastes（ FW） were investigated. Anaerobic digestions of FW were carried out at p H of 5,6,7,8 respectively at 35℃. The results showed that pH value could affect daily biogas yield and CH4 content significantly. The optimum pH values was 7,which obtained the maximum total biogas yield of 3692 mL and CH4 content of above 55%. The acetic acid content in the total VFAs accounted for more than 60%,and content of acetic acid and butyrate achieved maximum of 77%. No inhibition of ammonia nitrogen was found in modified anaerobic digestion systems.