多孔载体污泥减量工艺与机理

基于流离和多相生物反应原理开发了耦合生物反应器,考察了该反应器的脱氮效果和污泥减量效果,并在理论分析的基础上设计动态循环封闭反应器,考察多孔载体内污泥的厌氧分解情况.研究表明,耦合生物反应器在进水COD负荷为0.80~1.20 kg/(m³·d)、ρ(NH₄⁺-N)=70~90mg/L、ρ(TN)=75~110mg/L、T_HR=8 h、25℃时,采用低氧—厌氧—好氧工况较全程好氧工况具有更高的TN去除率和更低的污泥产率;在动态循环封闭反应器的液相中,ρ(TN)、ρ(TP)、ρ(TC)均有所增加,并且有CH₄气体产生,表明被多孔载体截留的污泥在其内部厌氧环境下发生了厌氧分解,从而达到污泥量少甚至不产污泥的效果.

Technology and Mechanics of Sludge Reduction by Porous Carriers

A coupling bioreactor based on the flow separate and multi-phase reaction principle is designed to study the nutrient removal and the effects of the sludge reduction.And a dynamic circular bioreactor is developed on the basis of the theory to investigate whether the sludge in the porous carriers has been decompounded in anaerobic environment or not.The influent loading of COD is from 0.80 to 1.20kg/(m~3·d),the concentration of NH_4~+-N and TN is from 70 to 90 mg/L and 75 to 110 mg/L respectively,hydraulic retention time and temperature in bioreactor is 8 hours and 25℃.The results show that the removal rate of TN is higher and the production of sludge is lower in the progress of micro-aeration+anoxic+aeration than those of whole aeration progress.The concentration of TN,TP and TC all increase and CH_4 is produced in the dynamic circular bioreactor.It can conclude that the sludge held back by the porous carriers was digested in anaerobic environment inside the porous carriers.Thereby,the sludge production is low and even has no sludge.