Membrane Bioreactors for Landfill Leachate Treatment
Hadler J., Koch Membrane Systems, Aachen, Germany
Over the last few years, there has been steady growth in the application of membrane bioreactor (MBR) technology for wastewater treatment. MBR systems with submerged membranes are increasingly used for some of the toughest wastewater treatment applications including sewage treatment for municipalities and treatment of wastewater for beverage, textile, food, paper and chemicals industries as well as landfill leachate treatment.
The membrane bioreactor concept is a combination of conventional biological wastewater treatment and membrane filtration. The concept is technically similar to that of a traditional wastewater treatment plant, except for the separation of activated sludge and treated wastewater. In a MBR installation this separation is not carried out by means of sedimentation in a secondary clarification tank, but by membrane filtration.
MBR systems are typically selected either due to the reduced footprint and civil construction costs, or due to the improved effluent quality that meets current and future discharge regulations. In addition, MBR effluent is often used for water reuse applications. MBR effluent may be used directly for reuse, or may be used as feed to a reverse osmosis system.
The process design of a complete MBR depends on many factors such as the wastewater characteristics, the required effluent requirements, the membrane system used, and numerous environmental factors. All designs have a number of common fundamental parameters and these must be addressed before the physical design of the filtration system can commence. These parameters are: the design flux for the process, the number of required membrane trains, the number of modules per train, the type of permeate extraction, the type of membrane aeration, the cleaning protocol and the membrane system location. It is important to fix these design parameters early in the system design to avoid extra work at a later date.
This presentation will discuss some practical aspects of MBRs in landfill leachate treatment. Data from an MBR system at the «De Wierde» landfill for household and industrial waste in the Netherlands will be shown.
Hadler Jan, Koch Membrane Systems, Kackert str. 10, Aachen, 52072, Germany. Tel. (241) 413-26-21, fax (241) 413-26-59. E-mail
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