Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/3/2003
Publication Date: 11/3/2003
Citation: SZOGI, A.A., VANOTTI, M.B., ELLISON, A.Q., HUNT, P.G. REMOVAL OF SOLUBLE PHOSPHORUS IN A SWINE WASTE TREATMENT WITHOUT LAGOON: DEWATERING AND VALUE OF PHOSPHORUS PRODUCT [abstract]. AGRONOMY ABSTRACTS. 2003 CDROM.
Technical Abstract: Manure P in excess of the assimilative capacity of land available on farms is an environmental concern often linked to confined animal production. A treatment process was developed for P removal from swine wastewater to eliminate land application and use of anaerobic lagoons. The system included solid-liquid separation, biological N removal and soluble P recovery treatment. In the system without lagoon that we developed, fresh flushed manure is first treated with polyacrylamide polymer to separate >95% of suspended solids, then subjected to a nitrogen removal using nitrification and denitrification, and then phosphorus is precipitated. The treatment provides an effluent virtually free from N and P. Elemental analysis showed that the precipitate consisted of calcium phosphate. Electron microscopy and X-ray diffraction analysis identified the precipitate as amorphous calcium phosphate (ACP). Prior to dewatering, the precipitate was conditioned with an anionic organic polymer. Precipitate was dewatered using commercial 190-micron mesh polypropylene filter fabric and contained 23% P2O5. Further analysis of the dewatered precipitate indicated that P was 98% plant available. Thus, the recovered calcium phosphate can be used as fertilizer without further treatment