Treatment of Phthalic Waste by Anaerobic Hybrid Reactor
Publication: Journal of Environmental Engineering
Volume 123, Issue 11
Abstract
The anaerobic treatment performance of phthalic acid at 4,000 mg/L (dry weight) by a hybrid reactor consisting of an upflow anaerobic sludge blanket (UASB) and a biofilter was examined. Using anaerobic sewage sludge as the seed and glucose as a carbon supplement, it took 3 months to initiate phthalate degradation. After that, the glucose supplement could be discontinued. At 35°C and a phthalic loading of 20 g-COD/L-d, the chemical oxygen demand (COD) removal efficiency was nearly 95%. About 89.5% of the removed phthalic COD was converted to methane. When the phthalic loadings were increased to 26.7, 33.0, 39.7, and 46.3 g-COD/L-d, the COD removal efficiencies were progressively reduced to 78, 65, 58, and 47.7%, respectively. More than 95% of the residual effluent COD was composed of nondecomposed phthalic acid. In the hybrid reactor, 86% of the biomass was found in the UASB section while the remaining 14% was found in the biofilter section. The anaerobic sludge could lead to granulation. At 35°C and a phthalic loading of 26 g-COD/L-d, the overall specific removal rate was 0.81–0.85 g-COD/g VSS-d, and the corresponding methane production rate was 0.24–0.26 L CH4/g VSS-d.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 123 • Issue 11 • November 1997
Pages: 1093 - 1099
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Nov 1, 1997
Published in print: Nov 1997
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