Journal
BIORESOURCE TECHNOLOGY
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123314
Keywords
High temperature thermal hydrolysis process (HTTHP); Anaerobic digestion (AD); High-solid sludge; Phosphorus fractions
Funding
- National Natural Science Foundation of China (NSFC) [51538008]
- Major Science and Technology Program for Water Pollution Control and Treatment, China [2017ZX07205-001]
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Transforming inactive phosphorus (P) to active P to recover it from waste activated sludge is important. The transformation of P fractions from high-solid sludge by the anaerobic digestion (AD) and acidification phase of AD (AAD) combined with a high temperature thermal hydrolysis process (HTTHP) was investigated. The results showed that the sequence of P release effects by three processes was HTTHP + AAD > AD + HTTHP > HTTHP + AD. The PO43--P release from high-solid sludge was directly affected by the temperature of HTTHP. At 140 degrees C, each process had more PO43--P release than that at 160 degrees C. The total amount of PO43--P release in AD + HTTHP was approximately 6 times that of HTTHP + AD. Based on the experimental results, a new process of mesophilic AD - post HTTHP was recommended, in which, enhancement of P release by sulfide ions was also proposed.
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