Abstract:
:The mechanism of newly prepared alkaline ferrate (NPAF) on the process of sludge aggregates disintegration and combined with anaerobic digestion to enhance the efficiency of reduction and dewaterability of excess sludge was investigated. The results showed that under a NPAF dosage of 70 mg/g total suspended solids (TSS), the extracellular polymeric substances (EPS) structure of the sludge aggregates was disintegrated, and the sludge disintegration degree (DDSCOD) reached 22.5%. The microbial cells in the sludge aggregates were not oxidized, and the direct anaerobic digestion of pretreated sludge could realize the rapid release and degraded of organic matter in the sludge and favor enhancement of the sludge settleability and dewaterability. Compared with the original sludge, the MLVSS of the sludge treated with ferrate pretreatment combined with anaerobic digestion decreased by 40.6%. NPAF exhibited oxidation and flocculation functions rather than phosphorus removal during the pretreatment process. Compare with direct anaerobic digestion of pretreated sludge, inoculation of the raw sludge during anaerobic digestion did not accelerate the release of organic matter, but could effectively enhance the sludge dewaterability and ensure the subsequent treatment of the sludge.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Li X,Yuan Y,Jin R,Huang Y,Ma Jdoi
10.1016/j.jenvman.2019.05.032subject
Has Abstractpub_date
2019-08-01 00:00:00pages
350-357eissn
0301-4797issn
1095-8630pii
S0301-4797(19)30630-9journal_volume
243pub_type
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