Innovations in municipal sludge and biosolids treatment have put SUEZ on the forefront of the Resource Revolution. From recovery to disposal and agricultural uses, we are taking steps to refine the wastewater cycle so that all steps continue to provide clean, efficient solutions for all our customers.
Challenges in Municipal Sludge Treatment

The increasing volume of sludge produced by wastewater treatment, in line with population growth and urban development, is a major concern for local authorities and operators. The role of sludge treatment companies in reducing volume and transforming it into recoverable products, whether industrial or municipal sludge management is critical to the environment. However, activated sludge management plants occupy substantial masses of land, are costly to build and operate, and demand an enormous footprint.


Wastewater sludge disposal is the inescapable byproduct of municipal sewage treatment. Globally, the production and land application of biosolids from wastewater treatment is an attractive solution, but due to concerns over the transfer of pathogens, contaminants and toxins to crops and species which come in contact with the soils, the application of biosolids reuse is restricted without proper treatment.


These biosolids management restrictions are mitigated when biosolids undergo recognized treatments to reduce or eliminate pathogen levels.  In the United States, the Environmental Protection Agency (EPA) governs biosolids under the Part 503 rule. Biosolids which are recognized to have gone through an accredited process, defined in 40 CFR Part 503 for pathogen reduction are deemed to be “Class A,” and are eligible for beneficial reuse. SUEZ uses a patented pasteurization process which is recognized under this rule, as an acceptable treatment process to produce “Class A” biosolids.

Biosolid and Sludge Solutions

Municipal leaders trust SUEZ to help them define and choose optimal sludge treatment and biosolids reuse solutions based on the sludge’s origin, composition and treatment by-products, as well as the sludge’s final destination, whether it will be recycled, recovered or destroyed.


Our solutions, which include sludge thickening, dewatering, digestion, drying and incineration, offer the following benefits:
• Increased dry content
• Long-term stabilization
• Optimal separation of water from matter
• Reduced weight and volume
• Easier recovery and disposal
• Recovery as green energy by generating biogas for beneficial use
• Reduced footprint and operating costs of facilities


Municipal wastewater operations require significant energy to operate. One beneficial reuse of biosolids is the production of biogas. But the biogas produced solely through anerobic digestion during wastewater sludge disposal isn’t typically enough to offset the electricity and heat load demand at plants. However, the advanced anaerobic sludge digestion technology pioneered by SUEZ can change the equation so municipal wastewater treatment plants (WWTPs) can get closer to energy neutrality. In some cases, they can even generate an excess. The average WWTP produces enough biogas, which can be converted to electricity or renewable natural gas, to cover 50 percent of the sludge treatment plant’s heat and energy load. At the most basic level, biological hydrolysis can get that number up to 70 percent to 80 percent. Adding biological hydrolysis and importing sludge or organics can boost that figure to as much as 150 percent, creating an energy-positive operation and providing a surplus of electricity or renewable natural gas that can be sold to the market.

Contact us to learn more about our wastewater and stormwater solutions directly from a representative.