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 ㎎/ℓ, 3,500?6,000 ㎎/ℓ and 17,000?50,000 ㎎/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/㎥/day whereas the maximum loading rates of raw SSW was up to 0.35 TN/㎥/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 PO₄³?-P in SSW were removed fficiently 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.
Abstract<BR>Introduction<BR>Materials and methods<BR>Results and discussion<BR>Conclusions<BR>Acknowledgements<BR>References<BR>
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