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- Title
柠檬酸污泥热碱预处理厌氧发酵产酸研究.
- Authors
周子安; 孙东霞; 刘翌锶; 马子惠; 董黎明
- Abstract
The changes in volatile fatty acids (VFAs), organic matter, fluorescent fraction, nitrogen and phosphorus, as well as organic matter content, dewatering performance and microbial community in the sludge fermentation broth after thermalalkaline pretreatment of the residual sludge from citric acid wastewater generated from the food fermentation industry were analyzed, while using batch and semi-continuous operation for sludge anaerobic fermentation experiments. The results of response surface optimization determined the optimal conditions for thermal-alkaline treatment of citric acid sludge at 62 ℃, pH 10.6, and 1 h. Thermal-alkaline pretreatment increased the concentrations of dissolved chemical oxygen demand, dis⁃ solved total organic carbon, and protein (PN) and polysaccharide (PS) by 4.75, 2.94, 12.67, and 15.49 times, respectively, and accelerated the anaerobic fermentation. In order to ensure sufficient substrate for VFAs, the semi-continuous group ad⁃ justed the sludge fermentation time to 3 d and the material replacement rate to 1/ 3 (SRT=9 d), although the VFAs de⁃ creased compared with the batch group, but still showed an increasing trend and the acetic acid concentration still account⁃ ed for the VFAs were about 50% of the VFAs. Fluorescence analysis showed that tryptophan-like proteins, humic acidlike substances, and fulvic acid-like substances were the main fluorescent substances, thermal-alkali pretreatment in⁃ creases TP by 2.23 times, but decreases continuously with acid production, while NH3-N remains largely unchanged after increasing with PN degradation. The dewatering performance of sludge will directly affect the yield of VFAs, while the filtration performance and dewatering performance of sludge decreases after fermentation. The relative abundance of the dominant bacteria Firmicutes in the sludge increased to 39.50% and 48.88% during batch and semi-continuous anaero⁃ bic fermentation, respectively.
- Subjects
FOOD fermentation; FLUOROPHORES; CHEMICAL oxygen demand; BIOCHEMICAL oxygen demand; HUMUS; CITRIC acid; FLUORIMETRY
- Publication
Environmental Science & Technology (10036504), 2023, Vol 46, Issue 3, p158
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1859.22.338