Commutative Multi-Influent Wastewater Treatment Process With Six Tanks For Nitrogen And Phosphorus Removal

Commutative multi-influent wastewater treatment processs with six tanks for nitrogen and phosphorus removal, a new developed process, consisted of five biochemical reaction tanks and a settling tank. Compared with conventional activated sludge process, mixed liquor recirculation was omitted and sludge recirculation was decreased. The process was characteristic of continuous influent, cyclic running and integrative design. Six phases constituted a running period. All biochemical reaction tanks experienced anaerobic, anoxic and oxic state in diverse phases. All influent underwent spatio-temporal anaerobic, anoxic and oxic condition also.Operational parameters of commutative multi-influent wastewater treatment process with six tanks for nitrogen and phosphorus removal were conducted: HRT was about 12 hours;Principal phase time and transitional phase time were about 3 hours and 2 hours respectively. Sludge return ratio and Sludge Retention Time were about 30% and 12 days respectively. The ratio of air to water was about 24.The removal efficientgcy of COD,BOD5, T-N,NH3-N,T-P were about 75%,85%,70%,90%,90% respectively.The quality of effluent can reach the National Discharge Standard GB18918-2002 of Pollutants for Municipal Wastewater Treatment Plant.Compared with orbal oxidation ditch and A2/O processes . The process run way is less cost and higher removal ratio to phosphorus and nitrogen.