Adsorption Characteristics Of Anaerobic Activated And Anaerobic Granular Sludge Under The Mesophilic Condition

The expirments were performed with anaerobic sequencing batch reactor(ASBR) using full-fat dried milk as a substrate at a constant temperature of 37℃. Initial rapid removal of the chemical oxygen demand(COD) about anaerobic activated sludge and anaerobic granular sludge were researched and conclusions were compared. Inffluent COD concentration and satic stage affecting adsorption were evaluated. Initial change about total COD, soluble COD and colloidal COD in the mixed liquid were analysed and adsorpion equilibrium time, adsorption category and adsorption isotherm were achieved.Biosorption has a better adsorption characteristics. There are a great deal of colloidal substrate in full-fat driedmilk accounting to approximate 60%. Total COD, soluble COD and colloidal COD using 0.45 u m filter and common filter were analysed and illustrated initial adsorption removal of anaerobic activated sludge and anaerobic granular sludge were very strong. 70-90% colloidal substrate were removed in initial 15 minutes. Under the same inffluent conditions, anaerobic activated granular sludge achieved higher uptake than activated sludge, especially anaerobic active granular sludge to total COD and colloidal COD removal rate were very higher. Biosorption data provided a good fit with the Freundlich isotherm model, which relative coefficient was 0.9951. But the data didn't coincided in the Langmuir isotherm. By the comparation of adsorption characteristics of active sludge and autoclaved sludge, biosorption category of anaerobic sludge to COD were achived mainly.With the influent COD concentration increased, initial uptake of sludge was increased. The more inffluent COD concentration , the more uptake of anaerobic granular sludge than anaerobic activated sludge, and change of adsorption rate were more evident. In ASBR process static stage had an effect on initialbiosoption.