Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   JULY 2003 , Volume 16 , Number 2 (TRANSACTIONS B: APPLICATIONS); Page(s) 143 To 154.
 
Paper: 

TREATABILITY EVALUATION OF MUNICIPAL WASTEWATER AND ANAEROBICALLY-TREATED INDUSTRIAL EFFLUENT IN A ROTATING BIOLOGICAL CONTACTOR

 
 
Author(s):  TORKIAN A., YAZDANI O., ALINEJAD K.
 
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Abstract: 
Performance of a rotating biological contactor (RBC) in treating municipal ‎wastewater from primary sedimentation basin and anaerobically treated industrial ‎effluent from an up flow anaerobic sludge blanket (UASB) reactor was investigated. ‎The 280-L six-stage RBC pilot was operated at different organic loading rates and ‎biodisc speeds. The overall removal efficiencies of soluble BOD decreased with ‎increasing organic loading rates. Disk rotational speed did not have significant effect ‎on performance in the range studied. The results showed that satisfactory treatment of ‎UASB effluent to meet regulatory requirement for agricultural purposes (effluent ‎BOD of 100 mg L^-1) can be achieved with sufficient margin margin of safety at ‎organic loading rate of up to 4.9±0.4g SBOD m^-2 d^-1 with SBOD removal ‎efficiency of 59±9%. For municipal wastewater, it was possible to achieve SBOD ‎effluent values of below 20 mgL^-1 all the time. Most of the organics were removed ‎in the first three stages with minimal contribution form the remaining stages of the ‎RBC reactor. There was a decrease in SBOD removal efficiency to 74±3% at OLR ‎value of 17.8±2.1g SBOD m^-2 d^-1 and 66±6% at OLR value of 4.7±1.9g SBOD ‎m^-2 d^-1 for UASB effluent and municipal wastewater, respectively. The results for ‎elimination capacity (EC) values indicated a linear relationship with first stage ‎organic loading rates without any signs of limitation in the range of OLR values ‎investigated in this study. However, average first-stage elimination capacity rates of ‎‎3.2 and 2 at OLR values of 17.8 and 11g SBOD m^-2 d^-1 for UASB effluent and 1.3 ‎and 2 at OLR values of 4.7 and 5.3g SBOD m^-2 d^-1 for municipal wastewater were ‎relatively lower than previous studies of RBC performance using domestic or ‎industrial wastewater without anaerobic pretreatment. It was suggested that the lower ‎EC values were due to the fact that a smaller fraction of UASB effluent was ‎biodegradable as reflected in SBOD/SCOD ratios of 0.47±0.04. For municipal ‎wastewater, even though SBOD/SCOD ratios were 0.49±0.03, the low EC values ‎were suggested to be contributed to lower influent concentration potential considering ‎first-order kinetics governing biochemical reactions‏.‏
 
Keyword(s): RBC, BIOFILM, FIXED-FILM TREATMENT, UASB, SLAUGHTERHOUSE, INDUSTRIAL WASTEWATER
 
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