Leaf spring diffuser | Solutions | METAWATER

Features

No clogging

Due to the large discharge port, there is no concern about clogging, unlike the membrane-type or porous-type diffuser. It requires no flexing procedure, such as blow-down and blow-up, for the prevention of clogging. Therefore, it is suited for intermittent operation.

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Hard to fail and does not degrading

It consists only of the main body, made of ABS resin that is excellent in terms of the rigidity, shock resistance, oil and grease resistance, heat resistance, and chemical resistance, as well as the leaf spring, made of SUS301. Since there is no membrane, rubber or any other material prone to degradation or swelling used, it can be used consistently over a long period of time. There are actual examples of use spanning a period of 20 years without maintenance having been required.

No orifice required for air flow rate adjustment

Since the discharge port aperture is determined by the balance between the supply air pressure and the elastic force of the leaf spring, it is compatible with a wide range of air flow rates. Owing to that characteristic, no strict air flow rate adjustment or management is required.

No check valve required

Since, once the aeration air flow is interrupted, the leaf spring itself closes the discharge port due to the effects of elastic force and water pressure, no wastewater or any other matter will flow backward to the main body and piping system of the diffuser.

Solids and slime are less likely to adhere to it

An air screen is formed around the main body as a result of the resonance of leaf spring, caused by supply air, and due to the air bubbles occurring from beneath the leaf spring diffuser. The screen prevents solids and slime from adhering to it and fibrous materials from twining.

Rubber porous air diffusers are suitable for sewage treatment and NOT for industrial wastewater treatment

Rubber porous air diffusers are commonly used for wastewater treatment all over the world. They are either rod-shaped or disk-shaped and have a rubber membrane with a lot of fine pores.
Rubber porous air diffusers were developed for sewage treatment. However they are also used for 'industrial wastewater treatment' in extremely harsh conditions compared with sewage treatment. So the weaknesses not exposed in the sewage treatment have become clear and beset by many problems. The following are the main problems of rubber porous air diffusers.

1. Clogging

Rubber porous air diffusers clog and can not be used after only a short period of time at industrial wastewater treatment plants where the concentration of activated sludge (concentration of microorganisms) is high.

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TThe activated sludge concentration in aeration tanks of sewage treatment plants is about 2,000mg/L, which is much lower than in industrial wastewater treatment plants. (The activated sludge concentration of industrial wastewater treatment plants is about 4,000 to 15,000mg/L or more.) Therefore, there are no noticeable issues as the speed of clogging is much slower at sewage treatment plants. 2. The Oxygen Transfer Rate falls significantly

Rubber porous air diffusers are generally thought to have high Oxygen Transfer Rate (OTR). However this is incorrect. Even though OTR in clean water is high, OTR in actual wastewater significantly decreases. For industrial wastewater with high activated sludge concentration, the Alpha value* drops to about 0.2 in worst cases. (*Alpha value=0.2 means that when the OTR taken in clean water is 30%, the OTR in actual wastewater decreases to 6.0%)

In addition, even in sewage treatment plants where the activated sludge concentration is very low, it has been reported from EPA in the USA that the Alpha value falls to 0.4'0.5. In other words, the OTR falls by 50'60%. This is a very serious problem. 3. Sludge accumulation in the tank bottom

Rubber porous air diffusers only discharge millimetre-sized air bubbles. Small bubbles have low buoyancy and do not rise quickly in water. Therefore the power to churn up the tank is weak and anaerobic sludge accumulates on the tank bottom.

Activated sludge concentration in aeration tanks of sewage treatment plants is very low, and it does not accumulate even with a slow water flow. Therefore this problem is not noticeable.

The above problems are unnoticeable in sewage treatment plants where the activated sludge concentration is low, so with rubber porous air diffusers it is relatively easy to obtain good results.
However, even if rubber porous air diffusers get high evaluation at the sewage treatment plants, they should not be used for industrial wastewater in extremely harsh conditions. This is because rubber porous air diffusers are not suitable for industrial wastewater.

This becomes quite obvious when analyzing 'total ability of aeration', in the case of using rubber porous air diffusers both for sewage treatment and for industrial wastewater treatment. 'Total aeration ability' can be judged by rating each item in the following analysis chart and seeing whether a large and even pentagon is formed or not. (It is the same as the nutritional balance in human meals. Even if one kind of nutrient is taken in excess, the human body can not use it. To keep good health, comprehensive nutritional balance is important. In order to maintain consistent wastewater treatment for a long time without energy loss and excess labor, it is necessary to evaluate air diffusers according to their total aeration ability.

Reference material: Can microbubble generator be used for aeration instead of air diffusers?

As a new aeration technology, there are companies advertising that microbubble generators can be used for aeration instead of conventional air diffusers. Are microbubble generators superior to air diffusers?
This is also clearly understood by judging the analysis chart of total aeration ability, as below:

Water in the aeration tank has low oxygen so the OTR reaches almost 100% regardless of what kind of microbubble technology is used. Therefore, if you focus only on 'OTR', it is always evaluated as excellent. However, the disadvantage of the microbubble generator is that it can generate only a small volume of oxygen-rich water even with a lot of energy. Even if a small volume of oxygen-rich watch is delivered to a small area, this is insignificant considering the entire aeration tank may contain hundreds to thousands of tons of wastewater. Therefore, it makes no sense if you make microbubbles in the aeration tank using large amounts of energy.

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