P-Chlorophenol Removal In Sequencing Batch Biofilm Reactor
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Date
2011-12
Authors
Mohamad, Muna Mastura
Journal Title
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Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The objective of this study is to compare the performance of sequencing batch biofilm reactor (SBBR) and sequencing batch reactor (SBR) in treating p-chlorophenol (PCP) and nitrogen. The SBR and SBBR systems were operated in five sequential periods, namely FILL, REACT (aerobic and anoxic), SETTLE, DRAW and IDLE in the time ratio of 2:12:1:1:8 for a cycle time of 24 h. The SBR was used as the control reactor (RC) while the other two SBBRs, RB1 and RB2, were operated with 3 and 5% (v/v) of polyurethane foam cubes as the carrier materials, respectively. Sludge age was maintained at 40 days throughout the study. The performance of the reactors was evaluated before and after the addition of PCP by monitoring the effluent quality and the settling characteristics of the sludge. Profile studies for PCP, COD, nitrogen species, chloride, DO concentrations and pH during the REACT period were also conducted. The results show that complete PCP mineralization was attained in all the reactors with the rate of PCP removal in the SBBRs being faster than that in the SBR. Complete ammonia nitrogen (AN) removal was achieved in all the reactors before the addition of PCP. After the addition of 100 mg/L PCP, reactors RB1 and RB2 still managed to achieve an almost 100% AN removal but the AN removal efficiency for reactor RC deteriorated to 81%. When the PCP concentration was increased up to 300 mg/L, the average AN removal efficiency for reactors RC, RB1 and RB2 decreased to 37, 67 and 57%, respectively. Further addition of 400 mg/L PCP had resulted in AN removal efficiency to deteriorate to 36, 37 and 40% for RC, RB1 and RB2, respectively due to the toxicity effects on microorganisms. Based on the results, the performance of the reactor can be ranked in the following order: RB2 > RB1 > RC.
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Keywords
P-chlorophenol removal in , sequencing batch biofilm reactor