It's often the case that if you ask the price of anything at all relating to engineering, you'll get the answer 'It depends'. Trying to establish the cost of an MBR installation is no different: there are many different components of cost, and many ways of determining them.
The MBR Blog
It's inevitable that anyone choosing to write a reference text book about MBRs is going to learn a lot. Perhaps the most obvious learning point, though, is the development of MBR membrane technologies themselves: the module and process configuration.
Length, area and volume are expressed in three different units in specific flux. To resolve to a single unit of length requires converting gallons to either cubic feet or cubic inches. Then there’s the concept of 'pounds force', force being mass times gravitational acceleration...
Unless they’ve spent the last 10−15 years living in a cupboard, pretty much anyone working in municipal wastewater will at least be aware of the issue of micropollutants: trace quantities of anthropogenic materials which are onerous to the environment.
A long-standing notion regarding wastewater is its potential to provide a useful resource, rather than being viewed as a waste. This is not completely far-fetched. Wastewaters high in readily biodegradable organic carbon can be anaerobically treated to provide methane.