Pulp and paper mills operations generates significant streams of wastewater and energy that contain by-products, such as black liquor from the digestion process. Oxygen is commonly used as an oxidant in a delignification, bleaching, energy and chemical recovery, and to increase DO level in wastewater treatment processes to increase treatment capacity, meet environmental regulations, improve product quality and a low-cost source of energy. PCI’s VSA technology delivers a high performing, robust, easy to operate on-site oxygen generating system helping customers to reduce operating costs, emissions and chemical consumption. Increased dissolved oxygen in wastewater treatment helps to reduce or eliminate odor problem.