Algal Turf Scrubber® systems produce harvestable algal biomass while removing nutrients from impaired surface waters, stormwater, agricultural runoff, and selected wastewater streams. This creates an important opportunity: the same biological production that supports water quality improvement may also provide feedstock for renewable fuels, bioproducts, and resource recovery.
Algae-based biofuel research has historically focused on suspended planktonic algae systems. Attached algae systems offer a different pathway. In ATS systems, algae grow on shallow flowways as attached communities that can be harvested mechanically. This attached-growth format may reduce some of the harvesting challenges associated with suspended algae systems while allowing treatment of large flows of nutrient-containing water.
HydroMentia and its research partners have participated in ongoing work evaluating attached algae systems for carbon utilization, biomass productivity, nutrient recovery, and conversion of harvested biomass into renewable fuels and related products. Current research includes evaluation of hydrothermal liquefaction (HTL), a wet-biomass conversion pathway that can produce biocrude suitable for upgrading into renewable diesel, sustainable aviation fuel, and related fuel intermediates.
This approach is especially relevant where biomass production can be combined with environmental services. ATS and related attached algae systems can recover nitrogen and phosphorus from low-concentration waters while producing harvestable biomass. In future biorefinery applications, the value of water treatment, nutrient recovery, carbon utilization, and renewable fuel production may be combined to improve project economics and environmental performance.
Biomass quality remains an important area of research. Ash content, algal species composition, harvest frequency, water quality, and system operations can all influence conversion potential and end-product value. Current research is evaluating ways to improve biomass productivity and quality through flowway design, hydraulic operation, algal community management, and downstream processing.
Biofuels should therefore be viewed as a developing but important opportunity for ATS technology. The primary commercial value of many projects may continue to be nutrient reduction and water quality improvement, but harvested algal biomass provides a platform for renewable fuel production, carbon utilization, bioproducts, and recovery of valuable constituents where project conditions and markets support those uses.