The lack of fresh water is one of the major threats for all living creatures. Extremely sufficient and expensive methods for saving water and wastewater treatment must be researched, applied and promoted. Conventional wastewater treatment systems rely on floating of suspended solids on the top of liquid by air bubbles. A better separation effect is obtained when air bubbles are very small (micro-bubbles and nano-bubbles). In traditional Dissolved Air Flotation (DAF) systems suspended solids and oily compounds are removed by coagulation, flocculation and removing the formed sludge by flotation by applying small air bubbles to increase buoyancy.
Green Water I technology is based on Dissolved Ozone Flotation (DOF) - a new advancement that makes Dissolved Air Flotation (DAF) and Dissolved Gas Flotation (DGF) systems more efficient for wastewater treatment. DOF uses ozone instead or air, which results in high concentration of micro-bubbles and therefore, enhancement of separation capability and effectiveness of the entire process. Ozone helps to destroy harmful substances, colours, odours, and microorganisms directly without harmful byproducts, or to create residue. Ozone also helps to remove surfactants, phenols, cyanides, and discolorations from wastewater. Ozone not only enhances coagulation, but also provides larger micro-bubble volume because the solubility of ozone in water is much higher than that of the air. Ozone enhances the separation rate by 13.6%, and turbidity by 21% in the DOF system, compared to the DAF system. Coliform and heterotrophic bacteria were removed by 54% and 57.3% respectively in the DOF system. Separation capability of the DOF system was greatly enhanced for most of the water quality parameters because ozone provides strong oxidation power with large volume of micro-bubbles.
Green Water I technology does not need costly coagulants for wastewater conditioning – using ozone promotes self-coagulation. This results in less post-flotation sludge and lower sludge dewatering costs. Green Water I system has 50% lower power consumption because of very small micro- and nano- bubbles. Additionally, practically 100% of ozone is consumed for solids separation and also for advanced oxidation of dissolved pollutants. Only less than 1% of ozone is left after DOF process and can be reused for ozone generation again, which significantly reduces the costs of ozone discharge protection.
Green Water I system reduces operating costs of wastewater treatment by almost 75%. Savings could be even higher because there are no additional costs for processing post-flotation sludge, and the disposal of metals.