Study On The Advanced Treatment Of Municipal Wastewater By Combined Speed-changed Biobilter

In china, the Expansion of urbanization has badly burdened the urban water environment, whereas the development of water economic require more water. Water reclamation and reuse can lessen the burden of water environment and can be a stable stable secondary freshwater resource as well, so it is an important new tendency to develop technology of water reclamation and reuse in the field of wastewater treatment. The water reclamation and reuse technology of municipal wastewater using combined velocity-changeable bio-filter(CVBF) was studied through full-scale experiment under different hydraulic load conditions.In this artice, the performance parameters and model of organic removeal in the CVBF were defined and recommended through abundant examination data and analysis of purifying mechanism. Other aspects such as the startup of experiment device, observation and analysis of microorganism were studied as well.According to the experimental results, the CVBF filled with the new-type enzyme-promoted media can acquire good effect when the wastewater flow into CVBF through the smaller section and out through the bigger section. Under the condition with normal temperature, pH6.5~8.0, operation flow 200m3/d , the average removal percentage of CODcr is abvoe 38%, those of turbidity , BOD5, NH3-N,P are above 80%,42.9%,20%,20%. The quality of effluence can meet the criterion of reused water quality(GB/T18920-2002),and the quantity of effluent is fit to the consuming demand of plant district.Furthermore, the dynamic models were deduced according to the experimental data.Based on these models, the quality of effluence could be forecasted exactly according to the operation conditions and parameters.