期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep42887
关键词
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资金
- National Natural Science Foundation of China (NSFC) [51608345, 51378330, 51408396]
- State Key Laboratory Breeding Base of Coal Science and Technology - Shanxi Province
- State Key Laboratory Breeding Base of Coal Science and Technology - Ministry of Science and Technology, Taiyuan University of Technology [MKX201504]
- Open Project of Key Laboratory of Environmental Biotechnology, CAS [kf2016004]
- China Postdoctoral Science Foundation [2015M570241, 2016M591416]
- Key Research and Development (R&D) Project of Shanxi Province [201603D321012]
- International Science and Technology Cooperation Project of Shanxi Province [2014081007-1]
Most studies on the production of volatile fatty acids (VFAs) from waste activated sludge (WAS) digestion have focused on operating conditions, pretreatments and characteristic adjustments. Conditioning by extra carbon sources (ECS), normally added in a solid form, has been reported to be an efficient approach. However, this has caused considerable waste of monomeric sugars in the hydrolysate. In this study, the effects of two added forms (pretreated straw (S) and hydrolyzed liquid (L)) of cornstover (CS) on WAS acidification were investigated. To obtain different cellulosic compositions of CS, low-thermal or autoclaved assisted alkaline (TA or AA) pretreatments were conducted. The results showed that AA-L test achieved the highest VFAs value (653 mg COD/g VSS), followed by AA-S (613 mg COD/g VSS). These values were 12% and 28% higher, respectively, than that obtained in the TA-L and TA-S tests. Meanwhile, higher percentages of acetic acid were observed after AA pretreatment (similar to 62% versus similar to 53% in TA). The added forms of CS played an important role in structuring the innate microbial community in the WAS, as shown by high-throughput sequencing and canonical correspondence analysis. The findings obtained in this work may provide a scientific basis for the potential implementation of co-digesting WAS with ECS simultaneously obtaining energy and high value-added products.
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