طراحي و ساخت پايلوت تصفيه بيولوژيكي پساب حاوي فرمالن به روش لجن فعال

Pilot Design of Biological Treatment for Waste Water Containing Formalin by Activated Sludge

Biological treatment of industrial waste water with activated sludge is Knon as one of the most effective methodes in removing toxic material such as formaldehyde. In this research it is atempted to set in motion and preserved the biological formaldehyde treatment system with activated sludge and the existing microorganisems will use the formaldehy as their food to grow. That is why an aerobic reactor with the volume of 8 liter known as Bioreactor is used. The primary biologic environment is provided by the returned sludge in Zargandeh Waste Water treatment plant and the system is started in the form of Batch. The input optimum formaldehyde as well as desired retention time to obtain the most efficient way for COD elimination and output formaldehyde are provided the highest percentage of COD volume with input formaldehyde concentration 70.ppm would be when retention time is 24 hours. Input formaldehyde concentration increase or residence time decrease will result in reduction of COD and pH elimination percentage.