Influence of pH controlling on fermentation performance in kitchen waste and cow manure

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Abstract
In order to make the process more sustainability and more efficient in co-digestion of kitchen waste (KW) and cow manure (CM), the effect of pH controlling at initial fermentation time (I), first gas stagnation time (A), and combination of both times (C) were investigated. Five pH values (6.5, 7.0, 7.5, 8.0 and 8.5) were set in each case to find out the optimal way of pH regulation with the consideration of changes in biogas and methane production, volatile solid (VS) reduction, and lag-phase time. The results show that adjusting pH of the co-digestion system could significantly improve biogas production except when pH was set to 6.5 in groups I and A. Adjusting pH twice (group C) could increase the system stability. When pH value was set to 7.5 twice, highest methane production (16501.10 mL), the highest methane yield of 287.64 mL/g VSadded, and a relatively short lag-phase time (27.3d) were obtained by C7.5.
Funding Information
  • Key Scientific Research Project for University in Henan Province (17A416004)
  • Key projects in Henan Province (182102311052)
  • National Natural Science Foundation of China (81803659)

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