The significance of polyacrylamide as a sewage treatment agent in the printing industry

Polyacrylamide has the following effects:

1.Principle of flocculation: When PAM is used for flocculation, it is related to the surface properties of the flocculated species, especially the kinetic potential, viscosity, turbidity and pH value of the suspension, and the dynamic potential of the surface of the particles is the particles.

The role of polyacrylamide in sewage treatment, it is also for. Remove some fungi from sewage. Can be backwashed. Then some of the water is purified and can be reused.

The role of Shouxin polyacrylamide in paper mills is:

1. It can improve the quality of paper with a fiber ruler, 2. Improve the dehydration and flushing performance of slurry, 3. Improve the retention rate of fine fibers and fillers, 4. Reduce the consumption of raw materials and environmental pollution.

The experiment proves that Shouxin brand polyacrylamide significantly improves the sedimentation performance and filtration performance of fouled high sludge, and its dehydration performance is better than that of other cationic flocculants. Polyacrylamide flocculant is used to treat wastewater, and it is found that its flocculation effect is better than that of other flocculated products; The product ** rate can be as high as the moisture content of the filter cake is reduced.

The application of polyacrylamide in the water treatment industry mainly includes three aspects: raw water treatment, sewage treatment and industrial water treatment. In raw water treatment, polyacrylamide is used in combination with activated carbon, which can be used for the cohesion and clarification of suspended particles in domestic water; In sewage treatment. Polyacrylamide can be used for sludge dewatering; In industrial water treatment, it is mainly used as a water treatment agent.

In raw water treatment, the organic flocculant is used instead of the inorganic flocculant, and the water purification capacity can be increased by more than 20% even if the sedimentation tank is not modified.

Therefore, at present, many large and medium-sized cities use their products as flocculants when the water supply is tight or the water quality is poor. In wastewater treatment, the use of water reuse cycles can be increased.

Shouxin Chemical will answer the factors that affect the dosage of polyacrylamide PAM:

1. Sewage water quality and concentration:

The water quality and concentration of sewage in different factories have a great relationship with the amount of polyacrylamide, such as the same sand washing plant, the sewage sediment content is different, the amount of polyacrylamide used is different, the same sediment content, different water quality and mud quality in different regions will also lead to different product usage. The water quality of industrial wastewater from chemical plants, pharmaceutical plants, paper mills, etc. is much more complex than that of sand washing plants, and small changes can cause changes in dosage levels.

2. On-site use conditions:

On-site use conditions include the dissolution concentration of water treatment chemicals, dissolution time, length and strength of coagulation time, and the influence of process equipment. When the dissolution concentration is high, it will increase the difficulty of coagulation, and the amount of agent used is not easy to control. The short dissolution time leads to the waste of chemicals and the increase in the amount of chemicals used.

When the coagulation time is short and the strength is low, it is not suitable to use high molecular weight or high concentration solution products, which is easy to waste agents. The influence of process equipment, such as the plate and frame machine is more drug-saving than the filter belt machine, and the equipment of different manufacturers has different water filtration performance. The above problems are just examples, and the operating conditions and equipment influence have a great impact on the amount of chemicals used in practical applications.

Third, the problem of product selection:

The polyacrylamide model determines its dosage, such as the use of anionic polyacrylamide 18 million molecular weight and anionic 8 million molecular weight, although the molecular weight is not the higher the better, but for most of the water quality high molecular weight products are used properly if the cost performance is still high, the two models are used in the same water quality The dosage is completely different, and it may be twice as bad or even worse.

Polyacrylamide has a wide range of applications, although it is now most commonly used in wastewater treatment.

1. Petroleum oil extraction.

In oil exploitation, it is mainly used for drilling mud materials and improving oil recovery rate, and is widely used in drilling, completion, cementing, fracturing, enhanced oil recovery and other oilfield exploitation operations.

It has the functions of viscosity, filtration loss, rheology adjustment, gelling, diversion, profile adjustment and so on.

2. Papermaking field.

PAM is widely used as a retention agent, filter aid, and leveling agent in the papermaking field.

3. Textile printing and dyeing industry.

In the textile industry, PAM is used as a sizing agent and finishing agent for fabric post-treatment, which can produce a protective layer that is supple, wrinkle-resistant, and mold-resistant.

4. In the field of mining and coal washing, the use of PAM as a flocculant can promote the settlement of solid matter in mining and coal washing water, make the water clear, and at the same time can be useful for solid particles to avoid pollution to the environment.

5. In the sugar industry, it can accelerate the sinking of fine particles in cane juice, promote filtration and improve the clarity of filtrate.

6. In the aquaculture industry, the water quality can be improved, and the light transmittance of water can be increased, so as to improve the photosynthesis of water. The above is only a small part of the application of polyacrylamide in various industries, and it is widely used in other fields.

1) For sludge dewatering, according to the nature of the sludge, the corresponding model of this product can be selected, which can effectively dewater the sludge before the sludge enters the filter press, when dewatering, the floc is large, the filter cloth is not sticky, the filter is not dispersed when pressing, the mud cake is thicker, the dewatering efficiency is high, and the moisture content of the mud cake is below 80%.

2) For the treatment of domestic sewage and organic wastewater, this product is positive in the matching or alkaline medium, so that the sewage with negative charge of suspended particles in the sewage is flocculated and precipitated, and the clarification is very effective. For example, the production of food alcohol wastewater, papermaking wastewater, urban sewage treatment plant wastewater, beer wastewater, monosodium glutamate factory wastewater, sugar wastewater, high organic content wastewater, feed wastewater, textile printing and dyeing wastewater, etc., the use of cationic polyacrylamide is several times or dozens of times higher than the use of anionic, nonionic polyacrylamide or inorganic salts, because this kind of wastewater is generally negatively charged.

3) The flocculant used for the treatment of tap water with river water as the water source, the dosage is small, the effect is good, the cost is low, especially the composite use effect with inorganic flocculant is better, it will become the efficient flocculant of the waterworks in the Yangtze River, the Yellow River and other basins.

4) Papermaking reinforcing agents and other additives. Improve the retention rate of fillers and pigments, and the strength of paper.

5) Used in oilfield economic and academic auxiliaries, such as clay anti-swelling agent, thickener for oilfield acidification.

6) It is used as a textile sizing agent, with stable slurry performance, less slurry, low fabric breakage rate, and smooth cloth surface.

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The amount of sewage treated with polyacrylamide is small and the efficiency is high, which is incomparable with other flocculants.

Polyacrylamide for sewage treatment is polymerized from acrylamide monomer and is a water-soluble linear polymer flocculant. It has the characteristics of fast floc formation, coarse floc, extrusion and shearing resistance, good early hole clumping and easy peeling with filter cloth. It is suitable for flocculation and sedimentation, sedimentation and clarification treatment of various sewage purification.

The amount of cationic polyacrylamide PAM added to different sludge is different, and the suitable PAM is different, some need anions, and some need cations. Before the selection of polyacrylamide, the charge properties of the sludge are measured, and the selection of PAM is determined according to the charge properties of the sludge. First of all, look at the characteristics of sludge, what kind of sludge is produced by wastewater?

In general, the PAM used for the dewatering of live land sail dry sludge is usually cationic. Polyacrylamide preparation solution is usually long, the dissolution and stirring time is relatively long, the solid PAM preparation usually needs to be stirred for more than 1 hour, and the amount of dehydrated sludge is recommended to be 20mg L wet sludge when there is no sludge sample to do the experiment (that is, the thickened sludge, the general moisture content of the thickened sludge will not reach 97%, usually more than 99%), and the dosing equipment, especially the metering pump selection, can be appropriately put into the margin for adjustment. Anionic PAM is generally used for the dewatering of physical and chemical sludge, which is more common in printing and dyeing plants, and non-ionic ones are generally used for electrolytic treatment.

If there is a mud sample, it is best to do a small test.

The above content is provided by Huaguang Polyacrylamide Factory.

In the treatment of pharmaceutical wastewater, polyacrylamide PAM can quickly and effectively precipitate suspended solids particles, residues, raw materials, etc. in pharmaceutical wastewater, reduce pollutant concentration, and improve the biodegradability of wastewater.

Pharmaceutical factory wastewater mainly includes four categories: antibiotic production wastewater, synthetic drug production wastewater, Chinese patent medicine production wastewater, and washing water and flushing wastewater in the production process of various preparations. Its wastewater is characterized by complex composition, high organic matter content, high toxicity, dark color and high salt content, especially poor biochemical properties, and intermittent discharge; At present, coagulation is used at home and abroad to treat pharmaceutical factory wastewater, and Shouxin polyacrylamide flocculant is added to its coagulation and precipitation, which can quickly and effectively precipitate suspended solids particles, drug residues, raw materials, etc. in pharmaceutical wastewater, reduce pollutant concentration, and improve the biodegradability of wastewater.

Polyacrylamide is a water-soluble linear polymer formed by the polymerization of acrylamide (AM) monomer by free radicals, which is insoluble in most organic solvents, has good flocculation, can reduce the frictional resistance between liquids, and can be divided into four types according to ionic characteristics: non-ionic, anionic, cationic and amphoteric type. Polyacrylamide, it can be said that polyacrylamide is a versatile all-encompassing chemical raw material, it can be found in almost every industry, PAM has flocculation performance mainly because the polyacrylamide molecular chain is very long, and its amide group can affinity and adsorption with many substances to form hydrogen bonds. This allows the PAM to bridge between the two adsorbed particles, forming a "bridging connection" and generating floc, which is conducive to the sinking of the particles.

It has the advantages of low dosage, outstanding effect and high cost performance, so it is also the largest amount of flocculant. Polyacrylamide can be applied to various sewage treatment (the use of polyacrylamide for domestic sewage treatment is generally divided into two processes, one is the charge neutralization of the polymer electrolyte and the particle surface; Second, the long chain of polymer electrolyte bridges with particles to form flocs. The main purpose of flocculation is to coalesce the fine suspended particles and colloidal particles in the sludge into coarser flocs by adding polyacrylamide.

With the increase of flocs, the sedimentation velocity gradually increases. In this way, the sludge can be better pressed through the filter press, and then the requirements of environmental protection treatment can be met. PAM is a polymer water-soluble organic polymer with a composition of several million to tens of millions, which forms a larger floc between the particles and the resulting huge surface adsorption.