The Comparison Of Treatment Effect Of Two-stage BAF And MBR In Water Reuse

Thermal power plant consumes the main water consumers, and reclaimed water reuse isan effective way to make full use of the thermal power plant water. Xiangyang power plantsewage treatment station currently used DAT-IAT and biological contact oxidation process, thetail water cannot reach the town sewage treatment plant pollutant discharge standard(GB18918-2002) level of B standard, so can not be directly reuse, need to be mentionedstandard transformation, make the tail water to fulfill the requirements of reclaimed water, andin order to prevent the ammonia nitrogen on the corrosion of copper tubes, the ammonianitrogen concentration of reclaimed water must be controlled below1mg/L. At the scene of thexiangyang thermal power plant, the contrast test of small dynamic in this study selects thetwo-stage BAF and MBR.Which was conducted to provide technical support for sewagetreatment craft mentioned standard transformation and reclaimed water reuse engineeringdesign and operation.The raw water of xiangyang thermal power plant sewage treatment plant as input forthis test, respectively, compared the two BAF and MBR operating conditions at thestart-up stage; comparing the two processes running in a stable stage, under differentloadind conditions as well as different influent dissolved oxygen concentration,investigates the two processes of COD, ammonia nitrogen, TN, TP, SS removal. Analysethe water level of comprehensive of the two processes for based on the correlation of theremoval of contaminants.Got the following conclusions:The start-up phase, both processes using artificial inoculation sludge, then stuffyaeration. In the case of the inflow of0.5L/h, two kinds of process for COD, ammonianitrogen, TN and SS can achieve effluent quality requirements, but for TP removal, wasn’tup to standard.At stable operation stage, investigates the effects of input loading which was0.5L/h,1.0L/h,1.5L/h and DO which was from1.5mg/L to8mg/L for the two processes. Theoptimal operating conditions of two-stage biological aerated filter were:1.0L/h for inputloading,2~5mg/L for DO. The optimal operating conditions of membrane bioreactor were:0.5L/h for input loading,3~5mg/L for DO.Based on the relevance of value of COD, TN, ammonia water, introducing the factoranalysis model, separately carries on the analysis of two processes, formed by the interaction of three index of comprehensive water level as the standard to judge water quality.Comprehensive comparison, two-stage aeration biological filter startup more quicklythan membrane bioreactor, better for pollutant removal efficiency, also more stable, so inthe water reuse engineering, two-stage biological aerated filter is better than membranebioreactor.