US Contract Awarded for Design and Supply of Sewage Sludge Incineration System

As part of the R2E2 (Resource Recovery and Electrical Energy) project, the Green Bay Metropolitan Sewerage District in Wisconsin has selected Degrémont, a subsidiary of SUEZ ENVIRONNEMENT (France), to design and supply a Thermylis 2S thermal oxidation system for the disposal of sewage sludge.

This contract, worth $21 million (€15 million) to Degrémont, will provide the district of Green Bay’s water management authority with a new sewage sludge incineration solution to replace its current, ageing system, in spring 2017. The Thermylis 2S technology selected complies with new US regulations on sewage sludge-related air pollution (US EPA MACT 129), which are set to enter into force in 2016.

The Thermylis 2S sludge incineration installation uses a 2-stage process. It is based on the principle of energy recovery and combines drying and incineration. Exhaust energy is recovered by an exchanger and used to pre-heat the fluidisation air for the incinerator and to pre-dry the sludge. Thermylis 2S is establishing itself as a genuinely “green concept”; it is energy efficient and can treat 51 tonnes of dehydrated, digested sludge per day, provide heating and generate electricity.

This thermal oxidation system offered by Degrémont is a key component in the resource recovery and electrical energy optimisation strategy developed by consultants CH2M HILL for the Green Bay wastewater plant.

Degrémont is a pioneer in the field of thermal oxidation technology, with more than 40 plants across the world equipped with the Thermylis fluid bed system, in North America, France, Spain and China. Its position as a leader in innovative and sustainable solutions for sludge treatment saw Degrémont recognised by Frost & Sullivan in North America as company of the year in 2013, in relation to treatment of the sludge produced by urban wastewater treatment.