Rotating disk method・Biofilm processes/ Sludge drying, Recycling drying

There are various activated sludge methods in wastewater treatment though, this article is about rotating disk method which is one of three types of biofilm processes.

Rotating disk method is a wastewater purifying method which make a part of rotating disk contact with wastewater and air to create biofilm, which is a film of microorganisms, on surface of the disk and to decompose organic matters exist in wastewater.It is also called rotating biofilm method.
About 40% of surface of a plastic disk is dipped into wastewater and the disk is rotated. As it rotates, microorganisms and biofilm are generated on the surface of the disk. Biofilm gets oxygen from air and gets pollution components containing organic matters from wastewater, then perform purification by decomposing with aerobic oxidation. Biofilm gets oxygen from air and gets pollution components containing organic matters from wastewater, then perform purification by decomposing with aerobic oxidation. In this process, old microorganisms are peeled off as its activity slows down while number of new microorganisms increases. The peeled microorganism is discharged as waste sludge after passing through final settling tank and disinfection apparatus. Waste sludge, on the other hand, is processed in proper ways after being condensed and dewatered. Blower apparatus which needs air volume control is not used here since aeration is not performed and there is no returning sludge process which is normally required in activated sludge method, therefore, operation management is easily done without high ability of operation management and specialized knowledge. This method is often used in wastewater treatments plants whose size is small.

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

Applications