Higher-quality biosolids that meet U.S. EPA Class A criteria can be reused nearly without limitations as a fertilizer to promote productive soils and stimulate plant growth.
Anaerobic digestion upgrades that enable clean-water plants to produce Class A material can offer multiple benefits, such as reducing the volume of biosolids so less product needs to be managed and transported.
One such upgrade is biological hydrolysis technology, which has been used for preconditioning sludge since 2002, mainly in the U.K. The technology can be installed as a retrofit ahead of existing anaerobic digesters to enhance digestion efficiency.
Beginning in 2016, SUEZ Water
