News, views and contacts from the global Water industry
 

US city to upgrade wastewater treatment plant with new digester

16 November 2012

The US city of Pratt has decided to upgrade its waste water treatment plant by replacing the digester at the facility from anaerobic (non-oxygen) to an aerobic (oxygen) system.

The switch to an aerobic system will increase the amount of oxygen used and improve the efficiency of the microscopic organisms that process waste in the plant, reported leavenworthtimes.com.

Pratt city manager Dave Howard said that the biological microscopic bugs would eat up the waste and clean the system, similar to a body's digestive system.

The upgrade was considered by Pratt after it began to find it difficult to clean away sludge using the current system of hauling the product to area fields.

"A lot of time we can't get out to the fields because of the weather," Howard said.

"The switch to an aerobic system will increase the amount of oxygen used and improve the efficiency of the microscopic organisms that process waste in the plant."

As well as processing the sludge, the plant usually analyses it and awaits state approval before applying it to the soil.

Pratt is also adding new covers to its equalisation basins to stop algae growth and setting up a maintenance building to accommodate the new belt press, which help increase oxygen in the system.

The city plans to install an induced oxygen system pump for sending pure oxygen in to the waste system of the plant, which upon completion is expected to cater to future wastewater treatment needs in the region.

"We anticipate substantial energy cost savings in plant operations," Howard added.

The project is likely to commence in spring 2013, subject to completion of the bidding process.