Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
Volume 19, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/ijerph192215093
Keywords
potassium ferrate; sludge reduction; anaerobic digestion; VFAs
Funding
- Jiangsu Postgraduate Practice Innovation Plan
- Suzhou University of Science and Technology [SJCX21-1406]
- Natural Science Foundation of China [51938010]
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This study investigated the effects of pH environment on the recovery of organic acid using potassium ferrate. The results showed that alkaline ferrate pretreatment significantly reduced the VSS of sludge and resulted in a higher accumulation of VFA during anaerobic digestion, without the need for additional alkaline substances.
Potassium ferrate has strong oxidation in both acid and alkali environments, which has attracted extensive attention. However, the impact of the pH environment on this coupling process with the goal of resource recovery has not received attention. Under the goal of the efficient recovery of organic acid, the changes of solid-liquid characteristics of sludge after acid and alkaline ferrate pretreatment and during anaerobic digestion were discussed. The results showed that compared with blank control groups, after alkaline ferrate pretreatment, the volatile suspended solids (VSSs) decreased the most, reaching 28.19%. After being pretreated with alkaline ferrate, the sludge showed the maximum VFA accumulation (408.21 COD/g VSS) on the third day of digestion, which was 1.34 times higher than that of the acid ferrate pretreatment. Especially in an alkaline environment, there is no need to add additional alkaline substances to adjust the pH value, and the effect of sludge reduction and acid production is the best.
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