The Study Of Biofilter Reactor Technology From Urban River Water

The urban river pollution China has caused widespread concerns in recent years,nitrogen and phosphorus in river water exceeded seriously, black-odor phenomenonoccurred occasionally. At present. Urban river management mainly adopt the methodof ecological restoration, but water quality improvement is not obvious because of(the)urban land and wetland area is relatively scarce. Putting the inland water cycleprocess as the main research idea, this paper studies a water treatment plant withsmall footprint，simple structure and tries to establish a new type of urban river waterquality improvement techniques.Through the investigation of I I city inland water quality, this paper analyzesinland water pollution characteristics of southern plains water network region. Theresults showed that the urban river eutrophication is serious, excessive pollutionlevels is mainly from nitrogen, organic matter in water is less，CODmh indicators hasreached V water quality standard; C/N ratio is low，the low DO is also the mainfeature.Therefore, this paper aims at depth denitrification of water, puts black smelly Ariver water as sample, based on these this paper designs a kind of biofilter reactoractivated carbon Filler and study its mechanism of simultaneous nitriifcation anddcriitriifcation and the removal technology of ammonia and total nitrogen in the water,and through aeration, carbon, hydraulic loading, hydraulic retention time to adjustoperating parameters to achieve the design goals of depth denitrification.Theexperimental results showed that:(1) Activated carbon filler biofilter reactor has a capacity of COD and ammoniaremoval, using activated sludge bio film run three days, CODmh removal rate reached30%，ammonia nitrogen removal rate reached60%; In addition, the biofilter hascertain resistance to high ammonia nitrogen loading, especially when subjected tohigh ammonia load impact, it can still maintain a higher ermoval rate. (2)Simu]taneousnitrification and denitrification capacity of the reactor hasgreatly alTectecl by DO，external carbonsource, hydraulic loading and so on. Inwhich，when aeration readied0.32L/miru the reactor has a better nitrification, whenDO is below0.32L/min, it is not conducive to NO2--N converted to NO3--N，andaffect the proceeding of the Nitration reaction; To realize the water deepdcnitrification, the biological filter is required to add external carbon sourcc tostrengthen denitrification effect). Plus external carbon source and when the C/Nvalue reaches8.5to10.0，the simultaneous nitrification and denitrification effect isbetter; hydraulic load for ammonia nitrogen removal eiffciency changes not big, butfor TN the removal efifciency has obvious change, which is because as the hydraulicloading increase gradually，the denitrification effect gradually reduced in the reactor(3)The effect of the biological filter to remove phosphorus is not affected by theamount of aeration and plus the additional carbon sourcc or not. The higher theconcentration of influent TP reactor，the higher the concentration of elffuent TPreactor，however, which has little effect on the removal rate of TP.According to the above analysis，the designed biofltter reactor has certainremoval effect on nitrogen and phosphorus of the polluted river，and can realizesimultaneous nilrilication and denitrification efleet, Iherefore il has certain feasibility.