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Which factors influence on sludge dewatering?
We are the manufactory which focus on Polyacrylamide almost decade. We are TOP5 polyacrylamide exporter in China.
What factors affect polyacrylamide sludge dewatering? Important is the four points, the first filtration pressure, PH value of water quality in the second, third, product selection, and the fourth is polyacrylamide stirring speed.
1, affect the filtration pressure on the sludge specific resistance: general as filtration pressure rise, filtration speed, sludge is proportional to the ratio test and calculation method known resistance, specific resistance and filtration pressure. With the filtration pressure increases, the specific resistance of sludge continues to increase, although at this time filtration speed, but because the pressure is too large, easy to plug the filter media, filtration speed increased little. Therefore, in practice, we recommend should be based on different situations, the appropriate filter through the filter was chosen.
2, stirring speed of sludge specific resistance: polyacrylamide flocculation is a complex process of chemical power, stirring speed greater impact on the flocculation. If the stirring is insufficient, the polyacrylamide flocculant and sludge can not be fully mixed, thus affecting the flocculation effect; if stirred too strong, they would have formed floc shattered, but also on flocculation process adversely. Our field experiments when stirring speed is 100s-1 / 20s-1 ~ 200s-1 / 35s-1, less sludge than resistance, although with increasing stirring speed increased slightly, but the increase was not significant; when the stirring speed is small, when 50s-1 / 15S-1, the high specific resistance, sludge dewatering performance, low stirring speed also described flocculation disadvantage. So in practical application, it should be to determine the optimal stirring conditions by experiment, and the chemically conditioned sludge dewatering process as soon as possible.
3, pH value on the sludge specific resistance: If the solution pH changes will affect the degree of ionization sludge colloidal particles and flocculant, thus affecting the degree of stretching of the molecular chain, the solubility and gene ridicule binding capacity, and therefore system the pH of the flocculation effect has a significant impact. pH in the 6-8 range, sludge specific resistance is minimal, dehydration best performance. Our experiments measured at the customer's site concentrated sludge pH around 7, so dehydration, without adding a coagulant to adjust the pH value can be directly dehydrated, after the removal of mud, sludge moisture content is low.
4, product selection for the impact of sludge specific resistance: PAM is divided into anionic, cationic, nonionic, amphoteric ion polyacrylamide. Anionic polyacrylamide molecular weight from 800-2000 million, or molecular weight cationic polyacrylamide in the 800-1300 million, or ion degrees from 10-80%, non-ionic polyacrylamide, zwitterionic polyacrylamide. How to choose from more than 40 varieties in suitable polyacrylamide is indeed a problem. We conclude that the experiment with the effect of cationic polyacrylamide relatively high cost-effective.
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