uASB اثر كاربرد پليمرهاي طبيعي و توليدي بر سرعت دانه سازي در سامانه

Natural and Synthetic Polymers Effect on Rate of Granulation in UASB System

In recent years, the uses of polymers have been extended in different parts of water and wastewater treatment plants and every year millions of dollars are paied for their improvement. In wastewater treatment polymers are used mainly on coagulation-flocculation, filtration and sludge dewatering steps. The use of polymers in rapid granulation is one of the new fields. The purpose of this study was to investigate the effect of three polymers including chitosan, HE and PEI on granulation considering their dosage and efficiency on wood fiber wastewater treatment using UASB in lab-scale. In order to examine the polymer effects on granulation, equal concentration of chitosan, HE and PEI were added to a definite volume of anaerobic sludge. The results indicated that HE produced more granules that were also larger, denser and more definite as compared to other polymers used in this study. It has also been observed that the supernatant liquid is clearer. But, by increasing chitosan concentration the granules become bigger. After 8 months of study, the COD removal efficiency has been increased from 50% to over 90%. This means that after granule formation and system adaptation to industrial wastewater, UASB can treat the wastewater with the organic loading rate of I to 10 kg/m3d.