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Sludge dewatering flocculant polyacrylamide's good or bad selection directly affects the dewatering effect of sludge. We need to go through the stages of small-scale testing, pilot testing, and debugging before normal operation. Small-scale testing refers to selecting a polyacrylamide model with better flocculation status after laboratory experiments, and then conducting on-machine debugging, which is also called pilot testing. Through comprehensive evaluation of factors such as dosage comparison, size and shape of flocculated clusters, flocculation effect, and cost, we can determine which model of product to use.
So some friends may wonder, why do we need to conduct further experiments after doing laboratory experiments and finding the model of polyacrylamide with better flocculation and dewatering effect? This is because the machines and equipment used on-site, as well as the manual dosing methods, may differ from the laboratory results. Parameters such as centrifuge speed and differential speed need to be adjusted by technicians or workers on-site according to actual conditions. All theoretical data can only serve as reference data, and practice is the only criterion for testing the truth.
When using a centrifuge as a sewage treatment machine, a key issue is the mixing of sludge and flocculant (cationic polyacrylamide is commonly used). Whether the mixing is sufficient determines the dewatering effect of sludge, the moisture content of the cake, and the amount of chemical agent used.
Because the quality of sludge and the situation of sludge wastewater are different in each factory, the type of flocculant used will also differ. Take coal washing plant wastewater treatment as an example. One plant uses anionic polyacrylamide, while another coal washing plant found through small-scale and pilot trials that non-ionic type works better for them. The same applies to the selection of sewage treatment agents.
The selection of polyacrylamide flocculant for sludge thickening directly affects the cost and effectiveness of the treatment process for enterprises. Therefore, when choosing suppliers, enterprises must carefully select manufacturers with rich experience and professional technical teams for win-win cooperation. The sludge generated by wastewater treatment has a high moisture content. Due to the characteristics of water combining with sludge particles, there are limitations to using mechanical methods to remove the water. The organic matter content and ash content of the sludge, especially the dosage of flocculant, have a significant impact on the final solid content. Generally, mechanical dewatering can achieve a solid content of 20%-30%, and the resulting sludge is called cake. The moisture content of the cake is still high, and it has fluidity, so its disposal difficulty and cost are still high. It is necessary to further reduce its volume. At this time, apart from natural air drying, only by inputting heat to achieve evaporation can large-scale volume reduction be realized. The treatment of drying using heat is called thermal drying.
