KE Shui-zhou,MO Qi-yang,MA Jing-wei,et al.Pretreatment of Kitchen Waste Wastewater and Recovery of Soluble Carbon Source by Fermentation[J].China Water & Wastewater,2021,37(17 17):1-8.
Pretreatment of Kitchen Waste Wastewater and Recovery of Soluble Carbon Source by Fermentation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
1-8
Column:
Date of publication:
2021-09-01
- Keywords:
- kitchen waste wastewater; volatile fatty acids; lactic acid; anaerobic acidification; soluble carbon source
- Abstract:
- To recover resources from kitchen waste wastewater, the kitchen waste wastewater with high lactic acid concentration was pretreated by alkyl polyglycoside (APG) and free nitrous acid (FNA), respectively, and then the carbon sources were recovered by acidogenic fermentation. Variations in concentrations of volatile fatty acids (VFAs) and lactic acid during fermentation were investigated. The soluble chemical oxygen demand (SCOD) increased by 38% when the APG was added at the optimum dosage of 0.10 g/gTS, and SCOD increased by 26% when the FNA was added at the optimum dosage of 1.66 mg/L. The main role of APG was to increase the SCOD concentration in the fermentation broth and the activities of acetic acid producing bacteria and propionic acid producing bacteria, while the FNA improved the SCOD concentration in the fermentation broth and promoted the accumulation of lactic acid. The pretreatment increased the denitrification potential and rate of dissolved carbon source, while the FNA pretreatment reduced the nitrite accumulation when the fermentation broth was used as the additional carbon source.
Last Update:
2021-09-01