AEROBIC CHLOROPHENOL TREATMENT USING FED-BATCH AND SEQUENCING BATCH REACTORS
Treatability of 4-CP and 2,4-DCP using fed-batch and sequencing batch reactor (SBR) systems was investigated. Complete removal of 4-CP and 2,4-DCP up to the initial concentrations of 130 and 75 mg l−1, respectively, was achieved with fed-batch reactors. In order to investigate the effect of solid retention time (SRT) on the COD removal efficiency, the fed-batch reactors were operated at 8 and 15 d of SRT. It was observed that the COD removal efficiencies did not exhibit significant variations with SRT in the presence of 4-CP, whereas high fluctuations were observed in the case of 2,4-DCP, possibly due to the poor sludge settleability encountered. In SBR mode of operation, unlike fed-batch reactors, chlorophenols were introduced as a sole carbon and energy source and it was observed that complete removal of 4-CP and 2,4-DCP could be achieved in SBR receiving up to 547 and 157 mg l−1, respectively.
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Document Type: Research Article
Publication date: 2002-01-01
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