Dissolved air flotation with aggregation / Sludge drying, Recycling drying

This article is about dissolved air flotation with aggregation which is one of various types of wastewater treatment. This is an advanced method of dissolved air flotation.

■ About Dissolved air flotation with aggregation


Flocculant is added to wastewater in flocculation tank and agitated to make floc by aggregating contaminants and floating matters in the wastewater. In pressure tank, pressured air is added into treated water and tiny bubbles are generated. The tiny bubbles are used in flotation tank. When bubbles are released to the atmosphere, they adhere to flocs of contaminants and floating matters, so that the flocs float up to surface. Floated flocs are called sludge(scum or floss) and collected by sludge collector. Water underneath them are discharged as treated water. Sludge separated from water (scum or floss) are collected, dehydrated and disposed, and part of treated water is sent to pressure tank and tiny bubbles are generated there. This method is often used in separation of solid and liquid for materials which have lower specific gravity than water such as oils, since it is difficult to be done with other method.

■ About Scum
Scum is a thick layer formed by the gas generated in the sludge at the drainage port or drainage channel, or generated in sludge holding tank, the septic tank, etc. Bacteria, coliform bacteria, urea splitting organism, suspended solid, fiber, oil/fat and carbonic acid gas float up, and bubbles form spongy thick films on surface.


dissolved air flotation with aggregation sludge dryer kenki dryer 15/05/2020



Dissolved air flotation / Sludge drying, Recycling drying


Types of waste water treatment / sludge drying, slurry drying, waste drying


■ Sludge drying


Water in the sludge thickened in the sludge thickener tank are removed at dehydration process to a certain degree.
However, moisture content is normally more than 80% and the sludge still has adhesiveness and stickiness. Also, latter processes are not easy because of influence of flocculants. Our drying apparatus of KENKI DRYER with international patented technology can surely dry any sticky, adhesive and viscus sludge, and also materials in liquid state like slurry, without clogging inside of the dryer. Also, because of its simple structure, its price is low and apparatus cost of the dryer can be retrieved by reducing industrial waste disposal cost within 3 years. Dried materials can be recycled as fuel, bacterial fertilizer, soil conditioner, etc. since component of the material is hardly changed because of its low-temperature drying method.
It can be applied to a system with pyrolysis apparatus as well.


Sludge drying



Please consider KENKI DRYER for drying of sticky materials, adhesive materials and materials in liquid state that no other dryer can deal with.
Initial, running and maintenance costs are low because of its simple structure based on internationally patented technology.
For sludge drying, costs of our dryers are estimated to be retrieved within 2, 3 years by reducing industrial waste disposal cost.
For raw material slurry drying, laborious works of manual operation will be decreased significantly by replacing box shaped compartment tray dryer with our dryer
In case of organic wastes drying, the waste can be recycled as fuel, fertilizer, soil conditioner and feedstuff after being dried.


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