Introduction and instructions

Sludge dewatering usually uses polyacrylamide as a flocculant. Polyacrylamide is a water-soluble polymer compound that becomes a linear organic polyelectrolyte flocculant after being dissolved in water. It is expected that its molecular chain will only contain a certain amount of polarity. The group can absorb the suspended solid particles in the sewage and agglomerate to form a larger flocculent sludge mass, thereby accelerating the sedimentation of the sludge particles in the suspension, clarifying the solution, and promoting the pressure filtration and dehydration of the sludge. Polyacrylamide is divided into anionic and cationic types. Usually polyacrylamide is used in combination with inorganic flocculants (such as polyaluminum chloride and ferric chloride, etc.) to show greater flocculation effect.

When polyacrylamide is mixed with sludge for flocculation reaction, it is necessary to add water and fully stir to dissolve it before it can be used after it becomes a polyelectrolyte solution. Its use method and steps are as follows:

1. Selection of dissolved water: Use clean water (or tap water), which requires good water quality, free of impurities, free of salt substances, and a good pH of 6.9~7.1.
2. Selection of (PAM): Use polyacrylamide (PAM) suitable for the flocculation of the sludge properties.
3. (PAM) solution configuration: mix polyacrylamide (PAM) and water in a certain ratio into 0.1~0.05% concentration (mass percentage) aqueous solution, that is, the ratio of water to polyacrylamide is 1000: (1~0.5 ). Special attention: When pumping PAM into the water, you need to slowly sprinkle a small amount into the water, and at the same time agitate the aqueous solution to avoid the particles from sticking to each other to form a water-insoluble jelly (such as cotton mass) and waste.
4. Dissolution and stirring: Continuously stir the PAM solution for 30 minutes to 50 minutes, the stirring speed is controlled at 100~150r/min, until the PAM powder particles are completely dissolved. Please use up the stirred medicine within 24 hours. It will gradually decompose and become invalid after expiration.
5. Flocculation and mixing: Add the linear PAM solution into the sludge in a small amount at a time. At the beginning, the mixing and mixing of the sludge should be accelerated, and then the mixing speed should be slowed down to facilitate the increase and Accelerate the sedimentation and observe the effect of flocculation. The upper part of the solution gradually forms free clarified water, and the lower part forms a larger flocculation mass. If it is not flocculated at Torr, continue to add PAM solution until it is fully flocculated.

Uses:

1. Papermaking additives. Anhui Jiayun Chemical's cationic polyacrylamide and anionic polyacrylamide can be used as papermaking additives in papermaking and papermaking wastewater treatment. Among them, cationic polyacrylamide as a sludge dehydrating agent can be used in papermaking wastewater treatment.
2. Urban sewage treatment. Cationic polyacrylamide is used for urban sewage treatment, which is used as a sludge dehydrating agent.
3. Coal washing industry. Anhui Jiayun Chemical's anionic polyacrylamide can be used as a coal washing aid in the coal washing industry, but cationic polyacrylamide is sometimes used. Which type of polyacrylamide product to choose is related to the coal washing treatment process and equipment.
4. Coating industry. Anionic polyacrylamide is used as a thickener in the coating industry.
5. Oil extraction. Anionic polyacrylamide can be used in petroleum extraction, and anionic polyacrylamide can also be used in tertiary oil recovery.
6. Concrete. Anionic polyacrylamide is used as a water reducer in concrete to improve the quality of concrete.
7. Electroplating wastewater. Anionic polyacrylamide or Henan Hancheng non-ionic polyacrylamide is suitable for use in the electroplating industry.
8. Incense making. Anionic polyacrylamide as a thickener is suitable for use in perfume making.

Classification:

According to the ion model, PAM polyacrylamide can be divided into: cationic polyacrylamide CPAM, Henan Hancheng anionic polyacrylamide APAM, non-ionic polyacrylamide NPAM, and zwitterionic polyacrylamide.

Among them, according to the ion degree and molecular weight, they can be divided into:

Cationic polyacrylamide CPAM is classified by ion degree, and is divided into: Henan Hancheng cationic polyacrylamide with ion degree of 10, 15, 20, 30, 40, 50, 60.

Anionic polyacrylamide APAM is divided by molecular weight, divided into: 6 million to 18 million molecular weight anionic polyacrylamide.

Non-ionic polyacrylamide NPAM is divided by molecular weight, divided into: 6 to 12 million molecular weight non-ionic polyacrylamide.

In addition, according to the use of PAM polyacrylamide, polyacrylamide can also be divided into: ultra-high viscosity polyacrylamide, special polyacrylamide for sewage treatment, special polyacrylamide for sludge dewatering, special polyacrylamide for concentrators , Polyacrylamide for steel mills, polyacrylamide for paper mills, polyacrylamide for fragrances, polyacrylamide for coal washing plants, and polyacrylamide for printing and dyeing plants.

The working principle of the flocculant polyacrylamide:

In the field of water treatment, the flocculant polyacrylamide mainly uses its own flocculating properties to bind the impurities and other harmful substances in the waste water to be treated together to form clumps and then settle down to achieve the purpose of purifying water quality. In this process, the flocculation effect of polyacrylamide is used.

Specifically, we can summarize the flocculation principle of the flocculant Henan Hancheng polyacrylamide as: when polyacrylamide is used for flocculation, it depends on the surface properties of the flocculated substance, especially the dynamic potential, viscosity, turbidity and pH of the suspension. The value is related. The dynamic potential of the particle surface is the reason for the particle inhibition. Adding polyacrylamide with opposite surface charge can reduce the dynamic potential and agglomerate, thereby achieving the effect of flocculation.

In the process of water purification with the flocculant polyacrylamide, its treatment will not only exert flocculation, but also produce adsorption bridging, surface adsorption and enhancement. The specific principle is:

Adsorption and bridging: PAM molecular chains are fixed on the surface of different particles, and polymer bridges are formed between the particles, so that the particles form aggregates and settle.

Surface adsorption: various adsorption of polar group particles on PAM molecules.

Reinforcing effect: PAM molecular chain and the dispersed phase link the dispersed phase together through various mechanical, physical, chemical and other actions, forming a network, thereby enhancing the effect. These principles of action are the fundamental reason why the flocculant polyacrylamide can exert excellent water treatment effects.