Abstract
ABSTRACT: The biodegradability of high concentrations of phenol and ocresol in wastewater and the impact of these toxicants on sludge settleability was investigated. Sequencing batch reactors were utilized to treat phenol and ocresol aerobically at a hydraulic retention time of 1 day and a solids residence time of 14 days. The reactors achieved greater than 99.5% removal of phenol and o‐cresol at toxicant loadings in the ranges of 0.1‐0.8 kg phenol/m3 · d and 0.1‐0.6 kg o‐cresol/m3 · d. The average 5‐day biochemical oxygen demand (BOD5) and chemical oxygen demand (COD) removal efficiencies were approximately 99% and 94%, respectively. High toxicant loadings were not observed to hinder the biodegradability of other waste constituents, reflected by the effluent BOD5 being consistently less than 5mg/L, or impair sludge settleability because the effluent total suspended solids (TSS) and sludge volume index (SVI) were consistently approximately 12 mg/L and 80 mL/g, respectively.
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