University of Massachusetts

Sukalyan Sengupta

Chen-Lu Yang

Sarina Ergas

Klaus Nüsslein

Ashish Sahu

Tabish Nawaz

Silver is recovered as Agnanoparticles from the spent solution obtained from the regeneration of an Ag-loaded ion exchange resin using electrolysis. The reclaimed regenerant solution is recycled and reused in a closed-loop scheme over multiple cycles. The recovered Agnanoparticles are monodisperse, spherical in shape, and have a mean diameter of about 6 nm.

Silver recovery as Agnanoparticles from ion-exchange regenerant solution

The invention relates to a system and method to reduce perchlorate in wastewater utilizing perchlorate-reducing bacteria, sulfur as an electron donor and mollusk shells as alkalinity agent. Embodiments of the invention include a perchlorate-reduction system comprising a bioreactor unit having perchlorate-reducing media comprising elemental sulfur, oyster shells and a microbial community, and can further include an optional pretreatment unit, wastewater-catchment and/or post-treatment components. Embodiments of the method include multiple steps utilizing the system and additional process steps that achieve enhanced perchlorate reduction.

Growing community of inventors

North Dartmouth, MA, United States of America

Sukalyan Sengupta