Chinese-style water treatment manufacturers must know the flocculation and settlement of polyacrylamide flocculant

2020-10-12 11:42:19 rtchem 8

Chinese-style water treatment manufacturers must know the flocculation and settlement of polyacrylamide flocculant

 

Polyacrylamide is known as all-round Auxiliary which was used in many industries. Its main function is to use as flocculant, precipitant and sludge dewatering agent in sewage treatment process. In fact, in addition to it is used as flocculant,polyacrylamide is also widely used in the manufacturing field. It is used as a thickener in the fragrant and construction industries; as a flotation agent and clarifier in the field of coal washing and mineral processing; as a sizing agent and finishing agent in textile sizing; as a paper dispersing agent in papermaking industry, as a paper retention and drainage aid Agent; protein extractant; gelatin clarifier, paint fog coagulant and other fields.

Puyang Rongtai Chemical Co., Ltd. is a professional manufacturer of water treatment chemicals, oilfield drilling mud materials, environmental protection materials and water purification materials. The main products are: anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, making-joss powder, polyaluminum chloride, carboxymethyl cellulose (CMC), PAC-141, FA-367, sulfonated asphalt powder, potassium humate and other oilfield chemical additives.The products are sold in Oilfield, papermaking, chemical, coal washing, textile printing and dyeing, coal washing, environmental water treatment, environmental protection materials, water purification materials and other industries, and won the praise from customers. In recent years, our company has been rated as “Contract-honoring and Credit-keeping” Enterprises by the Industry and Commerce Bureau. "And our products have been rated as qualified products by the Municipal Township Enterprise Administration, and have been awarded the Certificate of Qualified Enterprise by the State Bureau of Technical Supervision and the Certificate of Total Quality Management of the Ministry of Agriculture.

Our company has consistently adhered to the tenet of "Quality First, Customer Supreme, Quality Service, Credit Contract". With high quality products, good reputation and excellent service, our products are sold well in more than 30 provinces, municipalities and autonomous regions in China. We are willing to cooperate with domestic and abroad customer for win-win cooperation, common development and create brilliant!

Secondly, polyacrylamide is increasingly used in environmental protection, especially industrial sewage and domestic sewage. It is used in municipal sewage treatment plants, industrial sewage treatment plants, paper industry, food industry, textile industry, wine industry, petrochemical industry, leather manufacturing wastewater, and oil field wastewater treatment.

Polyacrylamide can be classified into four types of nonionic, anionic, cationic and amphoteric according to its ionic properties. According to the molecular weight, there are many different molecular weights, and the ionicity is derived from many models. In the face of the market's messy specification system, it is really difficult to optimize the polyacrylamide model for your own sewage system. How to choose the best types for sewage.

First, understand the source of sludge

Sludge is an inevitable product in sewage treatment. First, we should understand the source, nature, composition and solid content of sludge. According to the main components of the sludge, the sludge can be divided into organic sludge and inorganic sludge.

In general, cationic polyacrylamide is used to treat organic sludge, anionic polyacrylamide is used to treat inorganic sludge, cationic polyacrylamide is not easy to use when the alkali is strong, and anionic polyacrylamide is not suitable when the acidity is strong. When the solid content of the mud is high, the amount of polyacrylamide is usually large.

Second, the ionization choice of polyacrylamide

For the sludge to be dehydrated, the flocculant with different ionic degrees can be used to screen through the small experiment, and the best suitable polyacrylamide can be selected, so that the best flocculant effect can be obtained, and the dosage is minimized, and the cost is saved. . The key to selecting ionization is:

(1) The size of the floc

The size of the floc: the floc is too small to affect the speed of the drainage. If the floc is too large, the floc will bind more water and reduce the degree of the biscuit. The size of the floc can be adjusted by selecting the molecular weight of the polyacrylamide.

(2) floc strength (water content)

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

(3) Mixing of polyacrylamide and sludge:

The polyacrylamide must react with the sludge at a certain position in the dewatering equipment to cause flocculation. For this reason, the viscosity of the polyacrylamide solution must be suitable, and it can be thoroughly mixed with the sludge under the existing equipment conditions, and whether the two are uniformly mixed is a key factor for success. The viscosity of a polyacrylamide solution is related to its molecular weight and formulation concentration.

(4) Dissolution of polyacrylamide:

Good dissolution can fully exert flocculation. As mentioned above, the dissolution process of polyacrylamide is actually the ripening process of polyacrylamide. Sometimes it is necessary to speed up the dissolution rate. At this time, it is considered to increase the concentration of the polyacrylamide solution.

Therefore, product selection should have a laboratory beaker experiment.

Third, the molecular weight choice of polyacrylamide

Polyacrylamide molecular weight refers to the length of the molecular chain in the molecule, and the molecular weight of polyacrylamide is between 5 million and 18 million. Generally, the higher the molecular weight of the polyacrylamide product, the greater the viscosity, however, in use. At the time, the higher the molecular weight, the better the use effect. In the use, the molecular weight of the polyacrylamide should be determined according to the actual application industry, water quality, processing equipment and other conditions.


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