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The Powell Water Microalgae System (PWMAS) provides lagoon aeration via microalgae (biological oxygen generators) that greatly improves wastewater treatment compared to both non-aerated lagoons and aerated discharging lagoons and can be done at a much lower lifetime cost compared with surface aerators.
Patent Number: US 10,358,361 B2
Issued to: Scott Wade Powell
Powell Water Systems, Inc.
Patented: Microalgae for Wastewater Treatment
Tertiary/Redundancy Treatment Using Powell Water Systems Electrocoagulation
A robust and diverse community of microalgae is used for aeration of a wastewater lagoon. Unlike the cyanobacteria that forms a surface mat on lagoons and lakes, the microalgae utilized by the PWMAS, disperses evenly within the lagoon, thus providing 100% available oxygen for microbes to remove the incoming waste product --also known as biochemical oxygen demand (BOD5).
During times of upset conditions in lagoon systems such as ice, illegal dumping of pesticides, fats, oils, and grease (FOG), electrocoagulation is used to insure towns and industrial lagoons are kept in compliance during these upset times. Electrocoagulation (EC) is also added as the final disinfection step in the PWMAS process, eliminating chemical/UV or other disinfection processes. Electrocoagulation is effective in removing 99+% or a 4-log removal of fecal coliform as well as a high removal rate of pharmaceuticals, personal care products, and viruses.
Once microalgae are cultivated and introduced into the wastewater or confined animal lagoons, they are mixed, using fine-bubble diffusers, thus creating a critical mass of microalgal cells, When this microalgae-oxygen- produced mass mixes with the microbes in the wastewater lagoon, ideal digestion and elimination of the organic waste occures.
Microalgae Nursery Under Very Controlled Environmental Conditions
Mechanical blowers only provide about 20% oxygen, is very inefficient, and is disruptive to the entire ecosystem. Every structure and supporting equipment included in the PWMAS is used to maximize the growth of the microalgae and microbes; therefore, maximizing overall wastewater treatment.