Precautions to the use of cationic polyacrylamide:
1, the size of the floc: the floc is too small will affect the speed of drainage, the floc is too large will make the floc constrain more water and reduce the degree of mud biscuits. The size of the floc can be adjusted by selecting the molecular weight of the polyacrylamide.
2. Sludge characteristics: The first point is to understand the source, characteristics and composition of sludge. Depending on the nature, sludge can be divided into organic and inorganic sludge. Cationic polyacrylamide is used for the treatment of organic sludge. The relative anionic polyacrylamide flocculant is used for inorganic sludge. Anionic polyacrylamide is used when the alkali is strong, and anionic polyacrylamide is not suitable when the acidity is strong. High-time sludge usually has a large amount of polyacrylamide.
3. Floc strength: The floc should be stable and not broken under shearing action. Advancing the molecular weight of polyacrylamide or selecting a suitable molecular structure helps to improve floc stability.
4. Ionicity of polyacrylamide: For dewatered sludge, flocculants with different ionic degrees can be selected by small test first, and the best suitable polyacrylamide can be selected, so that the best flocculant effect can be obtained. It can also minimize the amount of drug added and save money.
5. Dissolution of polyacrylamide: good dissolution can fully exert flocculation. Sometimes the need to speed up the dissolution rate, then consider the concentration of the polyacrylamide solution.
In fact, when treating sewage in peacetime, some sewage uses a single flocculant, which is not effective. It must be used in combination. It is better to treat wastewater with inorganic flocculant PAC and polyacrylamide composite flocculant. The effect, but when adding the agent, pay attention to the order, the order is not correct, it is not effective.
Post time: Sep-02-2019