CONVENTIONAL ACTIVATED SLUDGE (CAS)

1. Operating principle

CAS is a wastewater treatment technology based on the adhesion of microorganisms to the suspended solids in the water. Water quality depends on the settleability of the activated sludge and the size of the reaction tank.

The reaction is carried out mainly by aerobic microorganisms in the aeration (Aerotank) tank.

2. Advantages

• Low investment cost, arising mainly from construction costs and some equipment such as aerators, pumps and mixers.
• Today there are many suppliers on the market offering wastewater treatment solutions based on traditional activated sludge technology.
• Treated water can meet Column A or B, depending on the size of the treatment tanks.

3. Disadvantages

• Effluent quality depends on the settleability of the activated sludge and the size of the tanks. For good treatment quality, the system requires a larger treatment area.
• The activated sludge concentration in the system is usually kept at 3–5 g/L for good settling. If the concentration is higher, the turbidity of the effluent may increase.
• Generates a large amount of excess sludge, leading to high sludge treatment costs.
• High energy consumption to supply the oxygen needed to sustain the microorganisms
• Effluent quality can fluctuate, because sludge settleability depends on many factors such as temperature, MLSS concentration, organic loading and hydraulic loading of the influent wastewater.
• Requires a large construction area
• Requires disinfection chemicals
• Rarely achieves the standard for the ammonium (NH4) parameter

Businesses interested in wastewater treatment solutions for industrial parks and industrial clusters, please contact NGO on +84 24 7300 0890 or email office@8ngo.com for direct consultation.

This website is copyrighted by NGO International Co., Ltd (NGO International). Any use or reproduction of part or all of its content in any form is strictly prohibited without our express written permission.