Introduction

Polyacrylamide can be divided into four types according to ionic properties: non-ionic, anionic, cationic and amphoteric polyacrylamide. According to the molecular weight, there are different specifica…

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Polyacrylamide can be divided into four types according to ionic properties: non-ionic, anionic, cationic and amphoteric polyacrylamide. According to the molecular weight, there are different specifications of molecular weight.

1. Understand the source of sludge

Sludge is an inevitable product in sewage treatment. First of all, we should understand the source, nature, composition and solid content of sludge. According to the different main components contained in 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 to treat inorganic sludge. It is not recommended to use cationic polyacrylamide when it is very alkaline, and it is not recommended touse anionic polyacrylamide when it is very acidic. When the solid content of the mud is high, the use amount of polyacrylamide is usually larger.

2. Ionic degree selection of polyacrylamide

The key to select ion degree is to check:

(1) The size of flocs

(2) floc strength (moisture content)

Strength of flocs: The flocs should remain stable without breaking under shear. Increasing the molecular weight of polyacrylamide or choosing a suitable molecular structure can help to improve the floc stability.

(3) Mixing of polyacrylamide and sludge:

Polyacrylamide must fully react with the sludge at a certain position of the dewatering equipment to cause flocculation. For this, the viscosity of the polyacrylamide solution must be suitable. The viscosity of polyacrylamide solution is related to its molecular weight and formulation concentration.