期刊
BIORESOURCE TECHNOLOGY
卷 294, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122160
关键词
Alkaline fermentation; Resource recovery; Polyaluminum chloride (PACl); Chemically enhanced primary sedimentation (CEPS); Magnesium ammonium phosphate (MAP)
资金
- Major Science and Technology Program for Water Pollution Control and Treatment, China [2017ZX07203-003]
- Natural Science Found of Jiangsu Province, China [BK20160475, BK20190719]
- Natural Science Research of Jiangsu Higher Education Institutions of China [18KJB610013]
- import plan of high-level talent for innovation and entrepreneurship of Jiangsu Province, China
In this study, alkaline fermentation was applied to promote organics and P recovery from polyaluminum chloride (PACl)-enhanced primary sedimentation sludge. Coagulant results demonstrated that the optimum PACl dosage of 100 mg/L resulted in the effective concentration of 73% of organic matter and 90% of P from wastewater into sludge. Batch fermentation results highlighted the ability of alkaline fermentation in improving the biodegradability of PACl sludge. More specifically, at pH 11, 43.3% of soluble organics and 36.49% of P were released to the fermentation supernatant. Furthermore, P fractionation fermented sludge results revealed that partial Al-P dissolution and organic phosphorus hydrolysis were the main drivers of the released P. Finally, at pH 11, 85% of P was recovered as magnesium ammonium phosphate from the fermentation supernatant at the 2:1 Mg/P molar ratio. In conclusion, 24.9% of organics and 27.9% of P from raw wastewater were converted to valuable products via alkaline fermentation.
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