Energy Efficient MBR Designs Can Significantly Reduce Operating Costs

The MBR technology is an attractive, flexible solution for plant expansion/enhancement
as well as for greenfield facilities. While capital costs of MBRs have become fairly
competitive with conventional treatment systems, the operating costs, specifically energy
requirements, require additional focus. In order to provide the most cost effective and
energy efficient system, enhancements with design, operations, and equipment selection
are required. There are several areas within the design of an MBR plant which provide the
opportunity for a cost effective design which balances capital and operating costs. These
include use of primary clarification, use of flow equalization, adjusting the balance of the
solids between biological treatment and the membrane basins, and pump configuration.
Key operational focus areas include membrane scour air operational strategies, use of flux
enhancers, optimization of the number membranes in service, and biological operating
conditions. Along with the operational strategies to reduce energy, energy efficient
equipment must be selected.