科研之友
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摘要
Optimal pH is critically important to maintain effective anaerobic digestion, and pH control of dairy processing waste (DPW) typically requires the use of added chemicals (buffers or bases). We studied an alternative approach for controlling pH during digestion of DPW (whey and yogurt waste) by means of comingling various municipal wastes including algae (harvested from water treatment facilities) and grass clippings. The substrates were digested in 60 L and 3800 L induced bed reactor (IBR) anaerobic digesters under mesophilic conditions. Under the conditions of the study, comingling of either algae (at 2.2% solids) or grass clippings (at 1.1% solids) promoted digestion of DPW without the use of chemicals to control pH. The algae were much easier to pump and handle but are not as generally available as grass clippings. Full-scale experimentation is needed with additional grinding and pumping equipment to optimize the amount of grass clippings to use with low pH, high oxygen demand wastes such as DWP and other food processing waste.
- 出版日期2014
