Wastewater Systems Products
Oldcastle Precast® Decentralized Wastewater Systems
patented Algaewheel® technology
AlgaePac™ Package Wastewater Treatment Plant
AlgaePac™ combines Algaewheel technology, simple clarification processes enhanced by the natural coagulating effect of algae filaments, and disinfection to provide effluent treated to tertiary standards. Discharge can be to:
- Reuse situations
Algae, a plant that grows through photosynthesis (assimilates nitrates, phosphates, and their antecedents into plant food), produces oxygen while consuming nutrients and CO2. In the Algaewheel environment, bacteria convert organic carbon into food for the algae. In turn, algae convert inorganics into food for the bacteria. The net result is a robust ecological environment and a treatment plant that:
- Provides tertiary treatment
- Has low energy requirements due to direct usage of solar energy
- Has low maintenance due to simple technology and natural processes
The Algaewheel is at the heart of the AlgaePac™ system. Click here to learn more about Algaewheel Technology.
Typical project applications include:
- Institutional and educational facilities
- Commercial development
- Government facilities
- Resorts and hotels
- Mobile home parks
|Typical System Components
| Renewable Energy
Algae can be processed with many existing thermal technologies to create electricity. The algae biomass generated from the Algaewheel system has a higher BTU value than most biomass feed stocks. The BTU value ranges from 8,000 - 15,000 BTU per pound depending on the waste that is being treated and the resulting algae that is produced. By comparison, pure wastewater sludge has a per pound BTU value of about 3,750, agricultural byproducts about 4,200, wood about 5,000, and coal averages about 10,500. Thermal technologies to process algae include direct combustion, pyrolysis, gasification, and co-firing. Algae can also be processed using anaerobic digestion to produce biogas. These processes result in different end products (i.e. gases, steam, and heat) which then can be converted to electricity.
Combustion technologies, such as furnaces and boilers, convert biomass fuels into several forms of useful energy, including hot air, hot water, steam and electricity.
Pyrolysis is a rapid heating process in which the biomass is converted to liquid pyrolysis oil and syngas. Oil may be further refined into usable products and the syngas can be used as a fuel source.
Gasification converts biomass into a combustible gas called producer gas and char. The producer gas can be burned directly for space heat or drying, converted by catalysts to a variety of liquid bio-fuels, or it can be burned in a boiler to produce steam.
Co-firing biomass as a secondary fuel in a coal-burning power plant helps reduce sulfur dioxide and nitrogen oxide emissions, and decreases net carbon dioxide emissions from the power plant.
Anaerobic Digestion is a biochemical process in which bacteria digest biomass, resulting in the production of digester gas (primarily methane). Algae can provide meaningful secondary benefits for digesters, including significantly enhancing the digestion of other biomasses and significantly reducing digester nuisance gases.
In addition to the advantages noted above with respect to various thermal processes, using Algaewheel biomass can provide consistency, continuous supply, greater thermal value, and elimination of biomass disposal costs.