This article is about anaerobic-aerobic method which is one of various activated sludge methods in wastewater treatment process. Anaerobic-aerobic method is a wastewater treatment method whose main purpose is to remove phosphorus from wastewater, and a method improved from conventional activated sludge process.
Method of removing phosphorus and nitrogen which cannot be taken away by conventional activated sludge process are called advanced waste water treatments method and anaerobic-aerobic method is one of them.
Red Tide in sea is caused by eutrophication that nutrient salts such as phosphorus and nitrogen flow into the sea.
|■ About anaerobic-aerobic method (AO method)|
Anaerobic-aerobic method is a waste water treatment methods aimed at removal of phosphorus and reaction tank is configured by two tanks called anaerobic tank and aerobic tank. Agitators are settled in anaerobic tanks and activated sludge in the tanks are keep being agitated. Since no air is sent into anaerobic tanks and there is no oxygen, microorganism and activated sludge become less active and release phosphorus. Inside of aerobic tank is in the state that aeration is done and oxygen are added into water. Microorganism and activated sludge take in phosphorus in aerobic tank where oxygen exists. During this process, amount of phosphorus that activated sludge take in is more than the amount which is released in anaerobic tank, and it is called excessive intake. Activated sludge containing phosphorus is sent to final settling tank and settled. Clarified water in the final settling tank is discharged after passing through disinfection apparatus and some of settled activated sludge is returned to reaction tank as returned sludge, then remained stuffs are sent to sludge thickening tank as waste sludge. Sludge thickened in thickening tank are dehydrated and treated as dehydrated sludge such as being dried.
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.
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|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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