Study On Water Treatment Effect Of The Moving Bed Biofilm Reactor With Fillers

With China’s economic and social development since the reform and openingup,people’s living standards gradually improved.What is following is fast increase ofwater demand,as well as industrial waste and domestic sewage.At present the waterpollution phenomenon of our country is quite serious,and part of the reason is the initialperiod have not carried on scientific development plan,resulting in a vicious circle afterpollution.Another part of the reason is that many of the technology of the waste watertreatment plant built in China in the last century,have been difficult to achieve the newemissions standards,resulting in excessive emissions of pollutants.The problem ofwater pollution has become a constraint throughout the economic and socialdevelopment,and the study on improvement of wastewater treatment processes,increasethe proportion of reclaimed water reuse in order to guarantee the sustainabledevelopment of water resources,has become an inevitable trend.In this case,the movingbed biofilm reactor（MBBR） which combines two conventional sewage treatmenttechonologies of advantages-biofilm process and activated sludge treatment has recievedmore attention.Conventional biological treatment of wastewater is made up of sewage activatedsludge and biofilm. Activated sludge process in theory and in practice is already quitemature, its typical traditional activated sludge process, extended aeration, pure oxygenaeration, oxidation ditch, and SBR method. Biofilm including biological filter, rotatingbiological, bio-contact oxidation, biological fluidized bed and moving bed biofilmreactor. Moving bed biofilm reactor referred MBBR, it is the principle of adding a certainproportion of the aeration tank of water suspended packing density close to the water, airor mechanical agitation effect, it was circulating in the aeration tank status. By addingthe filler so that the reactor type and quantity of microorganisms greatly increased,thereby enhancing the treatment effect. MBBR set two traditional wastewater treatmentmethod has the advantage, in the treatment effect, operation management, covers, etc.have improved significantly. The test uses a moving bed biofilm reactor pilot studyinvestigated three different fillers （multi-faceted hollow ball, BioM carrier and fiber balls）for the treatment effect of the reactor.Test device consists of water storage tanks, three UPVC biochemical reactioncolumn, peristaltic pumps, aeration pump, glass rotor flow meters, valves and inlet andoutlet piping components. Three UPVC reaction columns were divided into twoanaerobic and aerobic, each reaction column of the bottom third of the anaerobic stage,the upper two-thirds of aerobic aeration port was located between the two. Three reactor column anaerobic, aerobic two are respectively fill plus BioM carrier, multi-facetedhollow ball and fiber balls. Anaerobic fixed filler, filler aerobic segment with water andair flow circulation. Test procedures: three peristaltic pump raw water from the storagetank were raised to the bottom of the reaction column, through anaerobic and aerobicsegment, raw water and other organic matter and nitrogen to get degraded, and finally bythe discharge outlet located in the upper part, which was made of glass rotameter aerationcontrol. Biofilm startup phase method using intermittent mud, while making necessarybiota and water quality monitoring. When the three-column reaction of aerobic andanaerobic biofilm successfully started, continuous feeding and aeration, continuousmonitoring of water quality and biological phase, detection indicators CODcr, NH₃-N,TN, DO, T and pH.The test results indicated that the optimal process parameters were asfollows:the hydraulic retention time was6h,the dissolved oxygen concentration controlwas in about4-5mg/L,and the packing dosing ratio was50%.Moreover,the resultsshowed that BioM filers worked best,followed by the multi-surface hollow balls andfabric balls,and the average removal rate of the reactor to CODcrand NH₃-N couldreached over80%,to TN about50%.The test have shown that the application of anaerobic-MBBR could effectivelyremove CODcr;NH₃-N and TN.The process above-mentioned has the advantages of lessoccupied area,easy to operate,great buffering capacity and stable water quality and soon.And under the conditions of the water quality meet the national discharge standardof sewage,replacing the BioM padding with multi-surface hollow balls can cut theconstruction cost and reduce the energy consumption.