Research On Further Denitrification Treating Monosodium Glutamate Wastewater By Sequencing Batch Biofilm Reactor

Dosing the biological-modified suspended media into the traditional SBR reactor to form a Sequencing batch biofilm reactor(SBBR). Train the biofilm by monosodium glutamate(MSG) wastewater.The aiticle firstly study the growth pattern of the biofilm and the variation of microbes in the SBBR. Compare the SBBR's removal efficiency of COD, NH4+-N and TN with the SBR's. Then the paper mainly studies the several principal factors on the composite of biofilm reactor and determin the optimal control. In addition, to further optimize the biological nitrogen removel in the system,do the experiments on the pre- denitrification. These studies has certain theoretical significance to monosodium glutamate wastewater treatment.First, startup the Sequencing batch biofilm reactor successfully by training the biofilm. In the conditions of 18～25℃temperature, pH=7.0-8.0, DO=2.0-3.0 mg/L, cultivate the aerobic activated sludge to the composite reactor, using the MSG raw water to culture the biofilm. The dosing rate is 40%. After six weeks'stable operation the suspending media has grown mature biofilm, which gets thickness of 0.5～1.0 mm, and a quantity of 32～35mg/g, which makes the reactor increased nearly 2000mg/L adherent biofilm quantity.Second, contrast the system's treatment effectiveness of SBR and SBBR. Studies how the parametres(DO, pH) change during the reaction process. Combine theoretical analysis and the test data to analyses the influence of MLSS, the COD volume load, SRT in the suspended packing-activated sludge system. The results show that the SBBR system running under the condition of HRT=25h, DO= 2.0～3.0 mg/L, temperature of 17.5～21.8℃could get higher (about 2～3%) COD removal rate than traditional SBR system, and higher TN removal of 11%,while the denitrifying effect of the SBBR is more stable. Controlling the total MLSS remained around 5000mg/L, the ratio of MLSS film about 2.0, SRT of activated sludge within 10～15d would be the most appropriate. Third, the pre-denitrifying operation was designed in the SBBR system and the treatment effectiveness of monosodium glutamate wastewater was studied in order to optimize the operating mode. In the condition of HRT=20h,DO=1.2～1.8mg/L, a front 2h anoxia process, the system's TN removal was found 3.8% increase,which was conducived to the biofilm's efficient adsorption and storage on the oxygen carbon sources. The 6h-aerobic period include half 3h aeration of 500L/h oxygen and the left 3h-aeration of 250L/h. The system can achieve the best effect of nitrogen, COD, TN respectively the average removal rate 90% and 82%.