There was a time when it was easy to get rid of sludge.
One such disposal route for water companies, especially those serving large urban areas, would be to load countless tons of the stuff onto barges and send it out to the middle of the North Sea where it would be dumped. We live in more enlightened times, of course, and the sea disposal route was closed off for water companies in 1998 by European legislation. The challenge then was to find cleaner and more innovative ways to solve the sludge problem.
The next time you flush in the nation’s capital, you might consider this: You — or, more precisely, whatever you have flushed — will help generate clean energy.
Quoting ingress of WaterWord article:
“One of the world's largest facilities in Davyhulme is proving the importance of thermal hydrolysis technology combined with digestion prior to sludge incineration. Bill Barber, Rick Lancaster and Harald Kleiven discuss reasons for the technology choice and results from an energy study measuring inputs and outputs.”
Quoting George Hawkins, Chief Executive Officer (CEO) and General Manager of the District of Columbia Water and Sewer Authority (DC Water):
“We have built the first CAMBI thermal hydrolysis and digester system in North America which also happens to be the largest in the world. The benefits and costs of this project are both enormous: ...”
Cambi will construct a new Thermal Hydrolysis Process (THP) plant in the city of Hengelo, the Netherlands. The Cambi THP sludge pre-treatment will approximately double the capacity of the existing egg-shaped digesters from 9,000 to 18,000 ton sludge per year.
Norway’s Industry Minister Monica Mæland and Minister of Education Thorbjorn Røe Isaksen, visited Cambi´s headquarters in Asker. The ministers wanted to learn about industrial research, higher education, and public support. Cambi used our cases in Washington, Amperverband and Oslo as examples.
Cambi CEO Per Lillebø presented suggestions as to how research and education can improve conditions in Norway.
The Greek construction company Aktor has awarded Cambi a contract for the installation of Cambi’s Thermal Hydrolysis system (CambiTHP™) at Psyttalia Island Wastewater Treatment Works in Athens. Serving 5.6 million people, Psyttalia is the largest wastewater treatment plant in Greece and one of the largest in Europe. When operational in 2015 the Cambi system will treat about 50 dry tonnes of biological sludge per day.
The Long Reach project is a first of its kind in the UK. Thames water have selected AECOM as main contractor with Cambi as its specialist sub-contractor to build an upgrade to its sludge digestion plant in at Long Reach STW, in NW Kent. The plant has sewage treatment design capacity for 840,000 people equivalent and digests its sludge for use in agriculture as a fertilizer.