Regarding the issues with flocculation sedimentation tanks
Thread Content
Hello, experts in water treatment. I’m a senior student with no work experience, so I’d like to ask you guys for some advice. Recently, I saw on a website that there were some issues with their flocculation and sedimentation tanks; PAC was being used, but no mixing device was installed in those tanks. I’m wondering whether installing a mixing device would improve the results – would it lead to a significant enhancement in the flocculation effect? At the same time, I also want to ask that if a mixing device is to be added, could it be equipped with a pipe that extends to the bottom of the tank to facilitate mixing in a manner similar to aeration? I think using a mixer might result in too high costs~~~
This truly requires engineering calculations to determine the answer……
For a simple coagulation tank, your consideration is correct. Stirring is definitely necessary. Stirring methods: hydraulic stirring, mechanical stirring, aeration stirring. Just do it in the most cost-effective way possible, provided that calculations are made. The mixing cost depends on the amount of water. This is my personal opinion for reference only.
1. Adding stirring will definitely yield better results. Methods of stirring include hydraulic, mechanical, and aeration. 2. Aeration requires an air compressor or a Roots blower; generally, an air compressor is used as it results in lower costs.
I agree with you; add it as soon as possible, and the effects will be immediate.
Flocculation generally requires stirring, and the effect will definitely be better with stirring. For mechanical stirring, it is necessary to find the appropriate stirring speed, while for aeration, it is required to calculate the aeration volume. The stirring speed or aeration volume, equipment investment, and the volume of water in the sedimentation tank all affect the costs, and specific calculations are required.
This post was last edited by zhaolijun on 2015-10-22 at 15:11. Adding a mixing device improves the flocculation effect; both mechanical stirring and air stirring can be used, with mechanical stirring yielding better results. .
Air stirring requires higher operational skills, and its performance is not as stable as that of mechanical stirring.