Study On Application And Property Evaluation Of BIOSTYR Biological Filter In A Municipal Sewage Treatment Plant

In recent years, a lot of new water treatment techniques have been studied anddeveloped on the basis of traditional wastewater treatment processes. BAF isdeveloped based on the traditional biological membrane method; it has been widelyapplied in Europe, USA and Japan for its advantages in compact structure, hightreatment efficiency, qualified effluent and simplified process, etc. The Biostyrbiological aerated filter mentioned in this paper belongs to French company OTV.Research and explore on its operation efficiency is of great significance in its furtherapplication in our country.In this research, Qingdao Maidao sewage treatment plant was the main target,both the construction of the plant and the principle of every unit was studied, theparameters of every unit was also investigated; after the analyze and evaluation of thewhole plant, I found there were many indexes which vary from season to season, suchas influent flow rate, pH, COD, NH₃-N, TP, SS, and these indexes are alsoinvestigated for their removal from the plant.While the water-quality indexes of the influent could meet the design standards,the Biostyr in Maidao sewage treatment plant processed the wastewater well, theaverage removal rate of COD, NH₃-N, TP and SS reached67.15%、69.37%、91.74%、75.42%separately, the performance was stable and the effluent could reach the UrbanSewage Treatment Plant Emission Standards（GB18918一2002）, indicating that thiswastewater treatment process was very well capable of removing pollutants fromurban sewage.The study result of the key impact factors of BAF showed that while theHydraulic Load Effect was between2.70³.10m³/m²·h, COD in the effluent wasbasically below40mg/L, NH₃-N was below10mg/L, and the removal rate of both COD and NH₃-N reached70%, the system ran well, SS of the effluent was alwaysbelow20mg/L; while the COD volume loading is between3.16⁴.39kg/m³·d, COD inthe effluent stayed70%, the removal rate of NH₃-N reaches80%, while NH₃-Nvolume loading is between0.40⁰.63kg/m³·d, the removal rate of NH₃-N reached80%; the best temperature of the operation is16²6degrees Celsius, in this range,COD in the effluent keeps stable and reach the standard, NH₃-N removal rateincreased as the temperature went up and the best removal rate is80%at19degreesCelsius, COD and other indexes was not influenced by the temperature obviously inthis research.