What is Aeration?
In aeration, air is cycled through, combined with, or dissolved in a liquid. Thus, it is the process of bringing water and air into close proximity in order to remove dissolved gases and oxidize dissolved metals such as iron, hydrogen sulphide, and volatile organic compounds (VOCs). This procedure happens in the secondary treatment processes of activated sludge treatment in wastewater treatment facilities and is often the first significant step at drinking water treatment plants. Aeration systems, with appropriately distributed O2 supply, are critical for wastewater treatment and microbiological development.
Wastewater Treatment using Aeration
Aeration is an element of the secondary treatment process in municipal and industrial wastewater systems. The microorganisms feed on organic matter, generating flocks that settle off readily. The bacteria that create the "active sludge" flocks are continuously re-circulated back to the aeration basin after settling in a separate settling tank, increasing decomposition rates.
Water-fall aeration with spray nozzles is the most frequent type of aeration in industrial settings. Air is diffused into a receiving vessel containing counter-current running water in the air diffusion method of aeration.
Why is oxygen important in Wastewater Treatment systems?
The life processes of aerobic bacteria are dependent on oxygen. Because oxygen is only slightly soluble in water, it must be introduced to aerobic wastewater treatment systems on a regular basis to ensure proper waste treatment. Because aeration energy consumption is one of the most expensive aspects of running and maintaining a treatment system, selecting the optimal aeration type is critical.
How does oxygen get into water?
At the air/water interface, oxygen dissolves into water. At the surface, oxygen from the atmosphere spontaneously enters the water. Air bubbles moving through the water (diffuser or jet type aeration) or the mechanical action of surface aerators are used in most aerobic treatment systems to transfer oxygen.
What are the different methods of Aeration?
1: Aeration with fine-bubble diffusers
Aeration systems for wastewater treatment, using fine bubble diffusers, are energy efficient. Fine holes produce bubbles with a diameter of 0-3 millimetres. These systems distribute the dispersed gas volume to transfer the same quantity of oxygen as a coarse bubble diffuser system but these are less efficient to suspend solids and have clogging issues.
2: Aeration with coarse-bubble diffusers
Larger bubble diameters are produced by coarse bubble diffusers, which effectively displace, churn, and mix wastewater. These diffusers produce bubbles with a diameter of 3-50 millimetres.Traditional aeration, heavily loaded systems, sludge storage, aerobic digesters, and channels all benefit from coarse bubble aeration as it has a good mixing and fewer clogging problems but lower DO transfer efficiency.
3: Surface Aeration Systems
These work best in shallow water or when a high volume of oxygen is required quickly. In these systems, issues can be easily figured out. These are efficient systems for suspended solids but there are more units to service in basin.
What is the major role of Aeration systems?
1: They transfer DO with greater efficiency;
2: They keep biological solids suspended;
3: To avoid short circuiting or dead zones, they provide enough mixing.
Netsol Water provides a complete variety of standard and fully configurable aeration systems, as well as their comprehensive maintenance. Choosing a trained, accredited, and experienced wastewater system specialist will considerably boost your chances of long-term satisfaction with your overall system. Our 100% Satisfaction Guarantee promises that our technicians will completely resolve your system issues to your satisfaction.
We have qualified technicians on hand to provide a wide range of professional repair and modification services. Each system is custom-built as per the needs of our client’s.To begin the conversation, please contact us at +919650608473 or send an email to email@example.com for further information or product purchase related query.