ZHANGQi,SHANGGuan,LIUQing-xin,et al.Impact of Calcium Hypochlorite on Acid Generation through Dry Fermentation of Kitchen Waste[J].China Water & Wastewater,2024,40(19):115-121.
Impact of Calcium Hypochlorite on Acid Generation through Dry Fermentation of Kitchen Waste
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第19期
Page:
115-121
Column:
Date of publication:
2024-10-01
- Keywords:
- calcium hypochlorite; kitchen waste; dry fermentation; dissolved organic matter; VFA; key enzyme activity
- Abstract:
- Aimed at the issues of low hydrolysis efficiency and dissatisfactory accumulation of volatile fatty acids (VFA) in the dry fermentation of kitchen waste, the influences of calcium hypochlorite (CH) on the accumulation of VFA in the dry digestion of kitchen waste were explored under medium temperature conditions, and the related mechanism was analyzed. CH enhanced the production of VFA from kitchen waste. The optimal dosage of CH was 9% (measured by total suspended solids), with the corresponding maximum VFA production being 14.5 g/L, and the fermentation period was 10 days. CH enhanced the accumulation of small molecular carboxylic acids such as acetate and propionate in VFA. Mechanism analysis indicated that CH facilitated the dissolution of organic matters from kitchen waste. The higher the content of CH was, the greater the release of dissolved organic matter became. Nevertheless, CH impeded methane production, and the higher the CH content was, the lower the methane accumulation became. When the CH content reached 12%, the methane accumulation was merely 125.9 mL/gVSS. The analysis of key enzyme activity revealed that CH enhanced the activity of hydrolase and acidifying enzyme, and reduced the activity of the key methanation enzyme.
Last Update:
2024-10-01