Purple Phototrophic Bacteria (PPB) are an emerging technology that enables the treatment of wastewater streams while producing potentially valuable feed or feed additives. PPB technology shifts waste treatment operations to a resource recovery and value-adding paradigm. The technology integrates with existing biogas technologies and has potential to reduce or eliminate problematic waste steams (waste activated sludge, DAF sludge), while producing novel and sustainable feeds for livestock and/or aquaculture.