嫌気ろ床と接触ばっ気法を組み合わせた農業集落排水施設の窒素除去性能に関する一考察 [in Japanese] Survey on Total Nitrogen Removal Characteristics in Rural Sewerage Facilities with Anaerobic and Aerobic Submerged Filters [in Japanese]
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T-N removal performance was investigated using observed data on rural sewerage facilities with anaerobic and aerobic submerged filters. It was found that probability distribution of T-N in influent and effluent of rural sewerage facilities obeyed normal distribution or logarithmic normal distribution, T-N removal in anaerobic filter tank was assumed to depend primarily on influent T-N concentration, influent of NO<sub>x</sub>-N/T-N rate, and SS reduction in anaerobic filter tank. Because effluent NO<sub>x</sub>-N/T-N rate of contact aeration tank also will be determined from hydraulic loading (hydraulic detention time), it is clear that recirculation ratio shall be related to influent NO<sub>x</sub>-N/T-N rate of anaerobic filter tank. It is suggested that influent NO<sub>x</sub>-N/T-N rate of anaerobic filter tank may be affected significantly by recirculation ratio so that T-N removal shall be governed from recirculation ratio. It is possible that effluent T-N concentration and influent NO<sub>x</sub>-N/T-N rate of anaerobic filter tank can be predicted by recirculation ratio and effluent NO<sub>x</sub>-N/T-N rate from flow equation tank. Consequently, it is important that control of SS and hydraulic detention time is effective to maintain T-N removal efficiency in anaerobic filter tank. T-N removal in contact aeration tank is also influenced by influent T-N and SS reduction.
- Journal of Japan Society on Water Environment
Journal of Japan Society on Water Environment 24(4), 244-250, 2001-04-10
Japan Society on Water Environment