Application Of UAFB-ANAMMOX On Catalytic Wastewater

Pollutants in catalyst wastewater are very special and complex,which aredifficult to be treated. Because of its high temperature, large fluctuations of waterquality, poor biodegradability, high salinity and ammonia. It becomes one of thebottlenecks restricting the development of industrial catalysts, Shortcut nitrificationcan reduce aeration energy, alkalinity consumption and the cost of carbon source fordenitrification, while anaerobic ammonium oxidation （ANAMMOX）, as a newbiological nitrogen removal technology and one of the most economical ways ofbiological denitrification, has a lot of advantages, like low oxygen demand, littlesludge produced and no need for external carbon source. By comparing thestart-up,biofilm comforming and stability of ANAMMOX reactors with differentfillers,choosing an appropriate filler as ANAMMOX reacor, composing Shortcutnitrification and ANAMMOX offer a new way to treat catalyst wastewater.The start-up of UAFB-ANAMMOX can be divided into three phases,thestart-up time is （39d,64d and54d）. In the last stage, the maximum nitrogenloading removal rates（NLRs）are1.359,1.362,0.746kgN/m3·d respectively. Thereactor1with combined filler has shorter start-up time and more stable performance.Porous polyurethane foam is not suitable for bacteria to attach, thus the system isunstable. Three-dimensional elastic fiber is susceptible to dissolved oxygen andneed more time for stat-up and increasing loading.The reactor1with combined carrier has the best performance in resistance ofhydraulic loading. The highest nitrogen removal of each reactor are1.30,0.60and0.71kgN/m³·d respectively. HLR has significant impact on the reactor2withpolyurethane foam carrier and reactor3with elastic fiber carrier. Combined fillerand polyurethane foam do not have good performance in the resistance of substrateconcentration. Three-dimensional elastic fiber has better performance in theresistance of substrate concentration shock than hydraulic loading shock. However,anammox in this reactor has no advantage at high substrate concentration （bothabove198mg/L）. NLRs of three carriers are0.62,0.63and0.82kgN/m3·d onaverage. In the case of good behavior, NO₂^--N/NH₄⁺-N are1.01,0.86and0.96andNO₃^--N/NH₄⁺-N are0.24,0.23and0.20on average.Shortcut nitrification is controlled in partial nitrosation stage in the conditionsof DO0.5¹mg/L, pH value8and the temperature about35℃. The nitritenitrogen accumulation rate is97.82%and the NO₂^--N/NH₄⁺-N ratio of effluent is1.18on average. The capacity of nitrogen removal loading is approximately42mg/（L/h）. The anammox system respond dramatically to real wastewater shock becauseof unstable stage. With the domestication ratio increases, the COD removal capacityof anammox system increased accordingly.The total nitrogen removal rate ofcatalyst wastewater is61.69%by the treatment of partial nitrosation-anammoxprocess, total COD removal rate was56.19%. Nitrite nitrogen removal rate is just20.84%.