Abstract: A system-engineering is invented to install facilities for water- and energy-recycling, either in or near a city, and/or in a pre-existing or a new city park, includes one by an utility company to collect carbon emissions wherein the carbon dioxide is produced by burning of high-carbon fuels or lime, one by the same utility company to treat polluted waters and sewage-treatment discharges after the carbon emissions and polluted water are mixed in a series of water-conditioners, properly spaced to keep the mixture of the emissions and the waste-water treatment discharges at a designated value for biodynamic water-purification or for breeding of planktons as raw materials to be refined into biofuels. The system engineering renders the environment-engineering undertakings such as CCU, biodynamical water-purification, and manufacturing of biofuels enormously profitable for a public utility company.

Abstract: A system-engineering installations for water- and energy-recycling in an aqueous system, either in or near a city, and/or in a pre-existing or a new city park, includes one by an utility company to collect carbon emissions wherein the carbon dioxide is produced by burning of high-carbon fuels or lime, one by an utility company to treat waste-water and discharge treated waste-water, a series of water-conditioners, properly space to keep the mixture of the emissions and the waste-water treatment discharges slightly acidic, a small lake or large pond as aerial-bioreactor with a sufficient depth so that the surface layer is alkaline to breed cyanobacteria, with the CO2 coming up from dissolved carbon emission and the nutrients coming up from sewage-treatment discharges in the main body below the surface layer.