5 Proven Strategies to Prevent Aeration Tank Troubles

Aeration tank is the core of the whole wastewater treatment system, and the maintenance of activated sludge method is very important.
Today, we're going to talk about the problems that are often present in the actual operation of aeration pools and the coping strategies.

1. Common operation failure of aeration tank.

1). The production of liquid surface scum.

For wastewater composition is single, the activated sludge in biological phase structure is more onefold, running could not taken the easy outbreak of filamentous bacteria, filamentous fungi expansion leads to production of large Numbers of liquid surface scum in the activated sludge system.
Due to not anaerobic activated sludge to rise, so the aeration tank liquid level still and activated sludge scum color close to the color, the result of the microscope, visible within the protozoa and activated sludge of the scum protozoa difference is not very great.

2). The smell of activated sludge.

Under the condition of normal operation condition, people walk in the biochemical pool can smell the fresh activated sludge earthy taste, it is released in the process of activated sludge metabolic gaseous reactants, caused by inclusion in aeration gas overflow.
The soil odor of activated sludge tends to weaken when the activated sludge fails.
The activated sludge system may have a problem when it can't smell or smell other smells on a biochemical pool, such as a pH in a biochemical tank that emits an acidic or alkaline odor.

3). Aeration tank foam problem.

Bubble aeration for many reasons, often see a large number of outbreaks is white foam, more durable and less bubble is usually grey-brown, and also with some tiny activated sludge flocs.
A large number of bubbles can affect the aeration efficiency, which can also lead to the reduction of activated sludge treatment efficiency.

2. Analysis of common faults in aeration tank operation.

For the above operation problems, the reasons are analyzed as follows:

1). Causes of the aeration tank surface scum.

The scum is a kind of material with lower proportion than the aeration tank mixture. In practice, it is mainly due to the mixing of bubbles in the scum, which makes the scum float on the liquid surface.
The main reasons for the bubbles are:
The tiny bubbles produced by aeration are adsorbed by viscous activated sludge, and after adsorbing bubbles, the bacteria will naturally float on the surface of the liquid, resulting in the formation of scum.
When activated sludge decomposes organic matter or denitrification, it contains carbon dioxide and hydrogen gas. Such bubbles are more likely to produce scum after adsorption of viscous activated sludge.

2). Reasons for the abnormal odor of activated sludge.

In practice, it can be found that whether the activated sludge system is in a better state of operation.
A practice found that the intensity of a quake as soon as the active sludge earthy taste with the temperature, degree of activated sludge reaction and reaction intensity of biochemical system, such as under the high temperature, volatile intensified after the earthy taste of biochemical pool affected.
In addition, the pH value of too high or too low wastewater flows into the biological system, which results in the biochemical system overall activated sludge mixture pH abnormal fluctuations occur, it is easy to smell acid or alkali around the biochemical system, the adjustment of the biochemical system is very necessary, otherwise it might cause unnecessary on the biochemical system.

3). Aeration tank foam problem.

There are various reasons for the foam problems of aeration tank, and the analysis is more complicated, but there are some rules to follow, which are mainly analyzed and discussed from the following aspects.
The scum of the aeration pond is, in a way, evolved from a bubble.
Through the accumulation of foam, the scum will become thicker and thicker, and then the problem is that there is anaerobic and blackening inside the scum.
It has been reported that the scum of the aeration tank is related to the high viscosity of activated sludge, so it is also found that the production of foam is related to the viscosity of activated sludge.
When activated sludge is aged, it can produce a brown and brown foam that is fragile and easy to build up into scum and low viscosity.
In addition, when activated sludge is a large quantity of high load wastewater impact, can produce a lot of white with viscosity and easy accumulation of foam, and foam surface with no tan activated sludge scum.
When the wastewater contains detergent, surfactant or activated sludge poisoning, it will produce foam.

3. Common operation failure coping strategies of aeration tank.

1). Problem of liquid surface scum.

Due to the different reasons of scum, the coping strategies are different. The main countermeasures are as follows:
When there is a large amount of inert material in the wastewater that enters the biochemical pool, it can reduce the total amount of inert material entering the biochemical system by strengthening the coagulation and precipitation effect of the materialized section.
Meanwhile, the inert material in activated sludge can be gradually metabolized by means of sludge discharge.
For the liquid surface scum caused by the aging of activated sludge, it can be realized by adjusting the food micro ratio of the whole activated sludge system or reducing the concentration of activated sludge.
For the liquid surface scum caused by the expansion of filamentous bacteria, it is mainly aimed at the cause of the expansion of filamentous bacteria.
The commonly used treatment strategies are management process parameters such as dissolved oxygen, food micro ratio, pH value, etc.

2). Coping strategies of liquid surface foam produced by aeration tank.

The result of aeration tank foam is the same as that of scum, because there are many reasons.
The scum is mainly formed by the excessive accumulation of foam, so it is possible to refer to the scum part.
The foam of the white viscous type does not produce scum, which is usually caused by overloading, so it starts with the impact of reducing wastewater on activated sludge.
This article is posted by IROCHEM HEDP


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