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The Influence of Very Slowly Hydrolysable Fractions on the Optimization of the Operating Conditions in MBR Treatment of Tannery Wastewater

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A long term (410 d) pilot scale experiment was conducted at varying SRT (30 – 150 d) to study the application of membrane bioreactor (MBR) technology to the treatment of tannery wastewater. Two activated sludge (ASM) models were tested to simulate the production of solids. The first one, similar to the IWA ASM1 (Model 1), showed a good fit only at low SRT (<30 d); the second one (Model 2) which included a first order kinetics for the hydrolysis of the inert particulate COD (XP and XI) showed a better result in simulating the experimental data for all the values of SRT tested. On the basis of operating costs for excess sludge management and disposal and energy requirement for oxygen transfer, the optimal SRT was estimated with both models. The optimal estimated SRT was significantly different (20 d and 35 d) depending on the model.

Keywords: activated sludge modeling; excess sludge production; inert particulate COD; membrane bioreactor; operating costs; slowly hydrolysable COD; sludge retention time; solids retention time; tannery wastewater

Document Type: Research Article


Publication date: 2009-01-01

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