How is the dosage of the flocculant in the slag water determined?
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How is the dosage of the flocculant in the slag water determined?
It is generally around 60 ppm of the graywater circulation volume. After the system starts operating, water samples are taken for analysis, and then the flocculant manufacturer adjusts the formulation and dosage based on the results of those analyses
Based on flocculation sedimentation experiments, the typical addition amount is 1-2 ppm.
You are right; it is generally larger than your value. Cationic flocculants are used more often, while anionic ones are used less; the addition amount is 3–5 PPm
3–5 PPm is a bit high; here we usually keep it below 2 PPm. It might be related to the quality of the coal you use; I’m not sure if you’ve tried to reduce the amount used.
This needs to be verified through experiments, while also taking production into account. The ash content of the raw coal I have here is too high, usually around 20% (on an ash-on-base basis)
Are you using cationic ones? 5 ppm? Such a high concentration; it’s recommended that you replace it as soon as possible.
Currently, the dosage concentration of flocculants in graywater systems is generally between 1-2 ppm; these agents are single-component, with cationic polyacrylamide being the most common type. Of course, if the ash content in coal is too high, especially when the silica content is high, it can easily lead to an increase in the silica content in the ash water, turning it white, as well as causing blockages in the ash water pipelines and scaling of equipment. At this time, the two-component method can be used, yielding much better results than the single-component method.
There are already almost ten manufacturers from my side; moreover, the flocculant is also causing problems in the production department, so stop trying to deceive me! Hehe!
This post was last edited by Weiweiwei on 2016-11-24 22:57 :)
One must not add too much flocculant; generally, the amount is adjusted by trial between 1–3 ppm.