Treatment of strong nitrogen swine wastewater in a full-scale sequencing batch reactor.
Treatment of swine wastewater containing strong nitrogen was attempted in a full-scale SBR. The strongest swine wastewater was discharged from a slurry-type barn and called swine-slurry wastewater (SSW). Slightly weaker wastewater was produced from a scraper-type barn and called swine-urine wastewater (SUW). TCOD, NH4+-N and TSS in raw SSW were 23,000-72,000 mg/L, 3,500-6,000 mg/L and 17,000-50,000 mg/L, respectively. A whole cycle of SBR consists of 4 sub-cycles with anoxic period of 1 hr and aerobic period of 3 hr. The maximum loading rates of both digested-SSW and SUW were similar to 0.22 kg NH4+-N/m3/day whereas the maximum loading rates of raw SSW was up to 0.35 TN/m3/day on keeping the effluent quality of 60 TN mg/l. The VFAs portion of SCOD in raw SSW was about more than 60%. The VFAs in SUW and digested-SSW were about 22% and 15%, respectively. NH4+-N and PO4(3-)-P in SSW were removed efficiently compared to those in digested-SSW and DUW because SSW had high a C/N ratio and readily biodegradable organic. High concentration of organic was useful to enhance denitrification and P uptake. Also the amount of external carbon for denitrification was reduced to 5% and 10% of those for digested-SSW and SUW.
Poo
K M
KM
Department of Environmental Engineering, Pusan National University, Pusan, 609-735, Korea. kmboo@pusan.ac.kr
Jun
B H
BH
Lee
S H
SH
Im
J H
JH
Woo
H J
HJ
Kim
C W
CW
D000383:Agriculture; D000818:Animals; D019149:Bioreactors; D002244:Carbon / Q000032:analysis; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism*; D010100:Oxygen; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*
D002244:Carbon; D009584:Nitrogen; D010100:Oxygen