Utilizing waste eggshells as a calcium precursor for contact precipitation of phosphorus from digested sludge centrate.
Sci Total Environ
; 919: 170906, 2024 Apr 01.
Article
in En
| MEDLINE
| ID: mdl-38350578
ABSTRACT
Phosphorus (P) recovery from wastewater is an essential component of the global P cycle. A contact precipitation process using chicken eggshells as a calcium (Ca) precursor was used to recover P from synthetic wastewater and real digested sludge centrate. Up to 96.4 % of P could be recovered from the digested sludge centrate after three repeated cycles of the contact precipitation process. In addition, 36.1 % of total chemical oxygen demand and 37.6 % of total ammonia nitrogen were removed from the centrate. Finally, most of the precipitates could be collected by a simple washing step. Scanning electron microscopy-energy dispersive spectroscopy and x-ray diffraction results indicated that the eggshells played three roles in this process Ca source, precipitation substrate, and filter medium. Precipitates were mainly brushite. This research provides a new perspective on P recovery from wastewater using waste eggshells, and if further optimized, has a potential for practical future applications.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sewage
/
Wastewater
Limits:
Animals
Language:
En
Journal:
Sci Total Environ
Year:
2024
Document type:
Article
Affiliation country:
Canada
Country of publication:
Netherlands