Aeration involves the dispersion of air, and with that dissolved oxygen (DO), into a body of water. A certain concentration of DO is necessary to ensure the occurrence of self-purification processes and it acts as a prime indicator of the water quality for human use as well as for aquatic biota.
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Although aeration is typically an environmental process, natural aeration is not ideally suited to deliberate water treatment and/or remediation. Due to the low solubility of oxygen and consequently the low rate of oxygen transfer, the DO levels necessary to meet treatment requirements cannot typically be achieved through natural processes alone. Thus, the purification process ceases and the water can turn septic. To transfer the large quantities of oxygen that are needed, artificial aeration is employed to replicate natural processes, maintain required DO levels and replenish the used oxygen as part of the purification or remediation process. An added advantage of artificial aeration is the removal of volatile-dissolved compounds, which are ultimately responsible for tastes and odours as well as the corrosive nature of the water.
Thus, artificial aeration is a core component of the treatment of raw and/or waste water, in which air is deliberately introduced into a body of water, in order to produce clean water for drinking purposes and/or to treat municipal sewage or industrial wastewater. In the wastewater treatment process in particular, aeration can provide an aerobic environment to support the microbial degradation of organic matter. By enhancing the rate of oxygen transfer and the level of interaction between microorganisms and organic matter, the DO level is raised to allow aerobic bacteria to remove or reduce biochemical oxygen demand of the effluent.
HydroVenturi Applications
HydroVenturi is configuring its technology platform into a system with the following attributes:
- Significant financial and operational advantages
- High efficiency oxygen transfer and mixing ability
- Reduced energy cost and carbon footprint
- Low capital and operating cost
- Easily retrofitted with low maintenance requirements
- Consistent performance
Some facts...
The EU Water Framework Directive requires all inland and coastal waters to reach 'good chemical and ecological status' for surface waters and 'good status' for groundwater in terms of quality and quantity by 2015. The directive also aims to achieve elimination of hazardous substances by 2020.
Only 15% of the total length of UK rivers are healthy enough to support a vibrant ecosystem, and they're increasingly under pressure from growing human populations and the effects of climate change (WWF).
Nearly 40% of the rivers and streams in the U.S. are too polluted for fishing and swimming (American Rivers).
