Design Review of a $45 million WWTP Plant Expansion

A Case Study (download )


Large International Engineering Firm

Help Requested:

Type of Treatment:

This firm implemented the design of a very large WWTP treating over 33,000 m3/d of municipal sewage in Australia. Of particular concern was the effect of large variations in influent salinity caused by tidal conditions at this seaside location. It is well known that biomass deflocculation occurs at high salinity, but the effects at intermediate and transitory concentrations are not well documented. Wastewater Experts, Inc. was asked to review and comment on the firm’s design. After much research and analysis, the following conclusions were presented: