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• 연구 방법
• 연구 결과

제안 방법

• A laboratory-scale experimental apparatus, composed of TPAD and BNR processes, was installed and operated to investigate methane production and nitrogen removal (Fig. 1). The TPAD process, consisted of CSTR followed by methanogenic UASB, was applied for high-rate digestion.
• At steady state after 100-120 days operation, denitrification with acidogenic and methanogenic sludges was tested for both investigation of denitrifying activity and recirculating strategies of the nitrified effluent. Figure 4 shows the nitrate removal at different COD/N ratios with acidogenic and methanogenic sludges.
• In this study, TPAD combined with autotrophic BNR (anammox), was tested for nitrogen removal as well as methane production. Nitrogen removal by anammox could save organic matter and promote maximum methane yield in this system.
• In this study, nitrogen removal and methane production from strong animal wastewater were observed in TPAD process combined with biologic nitrogen removal (BNR) process. Effects of denitrification on both acidogenic and/or methanogenic activities were also investigated in both batch and continuous experiments.
• ,2000; Del Pozo and Diez, 2003, 2005). These works focused on the possibility of the integrated removal of nitrogen and carbon, which mainly tended to remove nitrogen with carbon as an electron donor for denitrification rather than methane production in anaerobic process.

대상 데이터

• The raw wastewater was sampled from the primary sedimentation tank at a local piggery wastewater treatment plant. The wastewater was screened through 150 μm diameter sieve to remove grit and coarse solids.

이론/모형

• 8 mM Na₂CO₃ as eluent solution. Ammonia nitrogen was measured by Nessler method (NH₄^--N distillation method; HACH Co., Dusseldorf, Germany). COD was measured by the closed reflux and colorimetric method and other analyses were carried out according to the standard methods (APHA, 1995).

성능/효과

• 1. The conversion efficiency of TCOD to methane from a strong animal wastewater was up to 72% and overall TCOD removal efficiency in TPAD-BNR system was as high as 97%. Methane production rate in methanogenic UASB was 0.
• 4. Removal Efficiency of TN was as low as 30-50% in TPAD-BNR, without recirculation of the nitrified effluent at Run-1. However, it could be improved up to 94-96% by recirculating the nitrified effluent to methanogenic and/or acidogenic reactor.
• Nevertheless, an interesting observation reported by Barber and Stuckey (2000) was that denitrifying ABR promoted the methane production. It was based on the hypothesis, not proven, that dissimilatory nitrate reduction produced reduced nitrogen as a nutrient for methanogenic archaea and denitrification increased pH slightly, that could change the environmental condition for methanogenesis. For improvement of nitrogen removal in methanogenic reactor, Mosquera-Corral et al.

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