How to choose polyacrylamide for sludge treatment in municipal wastewater
Source: | Author:佚名 | Published time: 2022-10-17 | 724 Views | Share:
Sludge is an inevitable product of urban sewage treatment.

1. Sludge is an inevitable product of urban sewage treatment. The first step is to understand the source, nature, composition and solids content of the sludge. Sludge can be divided into organic sludge and inorganic sludge. Generally speaking, cationic polyacrylamide is used to treat organic sludge, and anionic polyacrylamide is used for inorganic sludge. Cationic polyacrylamide is not suitable for strong alkaline conditions, and anionic polyacrylamide is not suitable for strong acidic conditions. When the solids content is high, the amount of polyacrylamide is usually large.

2. Size of flocs: Too small flocs will affect the drainage speed; By choosing the molecular weight of the polyacrylamide, the size of the flocculation can be adjusted.

3. Ionicity of polyacrylamide: For dewatered sludge, flocculants with different ionicity can be selected, and the most suitable polyacrylamide can be selected to achieve the best flocculation effect, with the smallest dosage and cost saving.

4. Flocculation strength: flocculation remains stable under shearing action without breaking. Increasing the molecular weight of polyacrylamide or selecting a suitable molecular structure can help to improve the stability of flocculation.

5. Mixing of polyacrylamide and sludge: Polyacrylamide must fully react with sludge at a certain position in the dewatering equipment. Therefore, the viscosity of the polyacrylamide solution must be suitable. Under the existing equipment conditions, the ability to fully mix with the sludge is the key factor for success. The viscosity of polyacrylamide solution is related to its molecular weight and preparation concentration.

6. Polyacrylamide dissolution: Only when the dissolution is good, the flocculation effect can be fully exerted. When the concentration of polyacrylamide solution increases, it is sometimes necessary to speed up the dissolution rate.

Shandong Welldone, as one of the top ten manufacturers of polyacrylamide in China, can provide customers with the required anionic, cationic and non-ionic polyacrylamide. If you are interested in a certain product, don’t be hesitate to contact us.