Application of cationic polyacrylamide Zetag 8125 Zetag8127

 

Cationic polyacrylamide and granular cationic polyacrylamide (CPAM) are linear polymer compounds, which can form hydrogen bonds by affinity and adsorption with many substances due to its various active groups. Mainly flocculation negatively charged colloid, except the turbidity, decoloring, adsorption, adhesion, and other functions, suitable for dyeing, papermaking, food, building, metallurgy, mineral processing, coal, oil field, aquatic products processing and fermentation industries such as waste water treatment of organic colloid content is higher, especially suitable for urban sewage, urban sewage sludge, sludge and other industrial sludge dewatering treatment.

Product form cationic polyacrylamide can be divided into two forms according to the different form of solid material and emulsion, the most widely used on the market is solid material, and cationic polyacrylamide emulsion as a new form of product market application is less.

Technical indicators

Appearance: white particle solid content: ≥88% Molecular weight: 8-12 million water insoluble matter: ≤2%

Residual unit: ≤0.1% cationic concentration: 10-70% Dissolution time: ≤60 minutes

Features 1, water solubility is good, can also be completely dissolved in cold water. Cationic polyamide

2, add a small amount of cationic polyacrylamide products, can be subject to great flocculation effect. Generally, only 0.01~10ppm (0.01~10g/m3) is needed to give full play to the effect.

3, at the same time the use of cationic polyacrylamide products and inorganic flocculant (polymeric ferric sulfate, polymeric aluminum chloride, iron salt, etc.), can show greater effect.

The degree of hydrolysis of polyacrylamide solution refers to the weak ion in polyacrylamide solution combined with water, the formation of weak alkaline or weak acidic ability, or the formation of weak acid in polyacrylamide aqueous solution and the formation of weak base ability. For strong acids and bases, the higher the degree of ionization, the stronger the corresponding acid base, and their hydrolysis degree is weaker. For some soluble polyacrylamide, the greater the degree of ionization corresponding to ionized more ions, and their degree of hydrolysis is weaker. In general, the higher the degree of ionization, the weaker the degree of hydrolysis, conversely, the lower the degree of hydrolysis, the greater the degree of hydrolysis.

Functions due to cationic polyacrylamide has the following functions:

1, clarification and purification effect 2, settlement promotion effect; 3. Promoting effect of filtration; 4, thickening and other effects.

Therefore, it can fully meet the requirements of waste liquid treatment, sludge concentration and dehydration, mineral processing, coal washing, paper making and other aspects.

1, PAM has a unique decolorization ability, mainly used in the decolorization of dye plant wastewater with high chroma, suitable for the variety of reactive, acidic and disperse dyes. 2, can also be used for textile, printing and dyeing, printing ink and other industrial wastewater treatment. 3. The decolorization rate of the product to wastewater can reach more than 95%, and the removal rate of COD is between 40-70%.

Usage Guide 1) Polyacrylamide is an organic polymer compound, can be divided into anionic polyacrylamide, cationic polyacrylamide and non-ionic polyacrylamide, for white powder or particles, soluble in water, but the dissolution rate is very slow;

2) anionic polyacrylamide is generally used for wastewater treatment flocculant, cationic type is generally used for sludge dehydration;

3) As a flocculant, the drug dosage is generally 1-2ppm, that is, the drug dosage per 1 ton of wastewater is about 1-2G;

4) When used, anionic type is generally prepared into about 0.1% aqueous solution, cationic type can be prepared into 0.1-0.5%;

5) when preparing the solution, add water in the dissolving tank first, then open the blender, and then add PAM slowly along the vortex, PAM can not be quickly put into one time, otherwise PAM will agitate to form "fish eyes" and can not dissolve;

6) After adding PAM generally should continue to stir for more than 30 minutes to ensure that it is fully dissolved;

7) Dissolved PAM should be used as soon as possible, anionic type generally not more than 36h, cationic solution is easy to hydrolysis, should be used within 24h.

 

The way in which a drug is added

Gravity infusion and pressure infusion are used for drug infusion. Regardless of which infusion method, liquid lifting equipment should be set up from the solution pool to the solution pool to the liquid infusion point. The commonly used liquid lifting equipment is metering pump and water injector.

1. Gravity adding the use of gravity to add the agent in the water pump suction pipe or suction well suction bell mouth, the use of pump impeller mixing.

2. Pressure adding the use of water pump or water injector to add the agent to the original water pipe, suitable for adding the agent to the pressure water pipe, or need to add to the higher elevation, far from the water purification structure.

3. Pump feeding pump feeding is in the solution pool to lift the liquid to the pressure pipe, there is a direct use of metering pump and the use of acid resistance to enhance the role.

Generally before use should be made into standby 0.1% ~ 0.5% of dilute solution, it is best not to store too long to make good solution, the concentration range of solution needs to be further diluted before use as 0.01 ~ 0.05 solution, the reason is that can be more ribs in the flocculating agent in the dispersion in the suspension system, can reduce the dosage, And can get better flocculation effect!

Many sewage treatment plants use cationic polyacrylamide as sludge dewatering agent. In the sludge dewatering process at the later stage of sewage treatment, the dosage of sludge dewatering agent is different according to the sludge type.

To know the relative accuracy of the dosage of sludge dehydrating agent, first understand these parameters, the moisture content of sludge, mud cake moisture content, mud quantity, dosage, dispensing concentration, etc

Sludge moisture content: the percentage of the weight of water contained in the sludge to the total weight of the sludge is called sludge moisture content.

Mud cake moisture content: the ratio of the weight of water contained in the mud cake to the total weight of sludge is called mud cake moisture content.

It's also done by the following formulas

1. Dosage mg/L= dosage quality/treatment water quantity/dispensing concentration

2, treatment water dosage = treatment water m3/h* dosage g/m3

3. Dry mud amount = treated water * [(1- sludge moisture content)/(1- mud cake moisture content)]

4. Reagent consumption g/m3 per ton of dry mud = dosage/dry mud quantity

The above calculation results may be relatively large error, only for reference in sewage operation. Actual drug consumption should be carried out in actual machine operation test.

Introduction of cationic polyacrylamide in wastewater treatment

1. Powdery cationic polyacrylamide is often used in organic wastewater: usually let sewage suspended particles with negative charge of sewage flocculation precipitation. It is very effective to rely on the presence of positive electricity to quickly clarify wastewater in acidic or alkaline media of positive ion in flocculation unit. In addition to powdery polyacrylamide, polyaluminum chloride and anionic polyacrylamide molding materials are also widely used in organic wastewater treatment.

2. Alcohol plant waste water, brewery wastewater and gourmet powder factory wastewater, sugar refinery wastewater, meat factory waste water, beverage factory waste water, textile dyeing and all kinds of sewage in the engineering of wastewater treatment plant, with various organic solvent and inorganic and organic sulfides, hydrocarbons and chlorine gas, oil, mercury and other harmful to the environment, can use PAM flocculation after discharge. It can also be used as mud treatment agent in oilfield development process, selective water blocking agent, water injection thickening agent, textile printing and dyeing process softener, electrostatic prevention agent and general sterilization, disinfectant, etc.

3. Used for water supply purification, water/oil system demulsification, oily wastewater treatment, wastewater recycling and sludge dewatering, etc. Polyacrylamide can effectively reduce the frictional resistance of fluid, adding trace polyacrylamide in water can reduce resistance by 50-80%.

Use 1), used for sludge dewatering according to the nature of sludge can choose the corresponding model of the product, can effectively in the sludge into the pressure filter before sludge dewatering, dehydration, flocculation, non-stick filter cloth, pressure filter is not scattered, flow mud cake thick, dehydration efficiency is high, mud cake moisture content below 80%. 2), used for the treatment of domestic sewage and organic wastewater, the product in the compatibility or alkaline media are positive, so the suspended particles in sewage with negative charge of sewage flocculation precipitation, clarification is very effective. Such as the production of grain alcohol wastewater, papermaking wastewater, waste water of urban sewage treatment plant, beer wastewater, gourmet powder factory wastewater, sugar water, high organic content Waste water, waste water feed, textile printing and dyeing wastewater, etc., with cationic polyacrylamide than with anionic, nonionic polyacrylamide or inorganic salts effect is several times or tens times higher, because this kind of wastewater with negatively charged.

3), used for the treatment of tap water with river water as the source of flocculant, less dosage, good effect, low cost, especially with inorganic flocculant compound use effect is better, it will become the treatment of the Yangtze River, the Yellow River and other watershed of the tap water plant efficient flocculant.

4), strengthening agent and other additives for paper making. Improve the retention rate of filler, pigment and paper strength.

5), used for oil field economic AIDS, such as clay anti-swelling agent, oil field acidification with thickening agent.

6), used for textile sizing agent, size stable performance, less falling pulp, fabric breakage rate is low, clean cloth.

Use process: the use of polyacrylamide should follow the following principles:

1, granular polyacrylamide flocculant can not be directly added to sewage. It must be dissolved in water before use, and its aqueous solution is used to treat sewage.

2, dissolved granular polymer water should be clean (such as tap water), not sewage. Normal temperature water can, generally do not need to add temperature. Water temperature below 5℃ is very slow dissolution. The dissolution rate increases with the increase of water temperature, but above 40℃ will accelerate the degradation of polymer, affecting the use effect. Generally tap water is suitable for preparing polymer solutions. Water with strong acid, alkali and high salt content is not suitable for preparation.

3, the selection of polymer solution concentration, it is recommended to be 0.1% - 0.3%, that is, 1 liter of water add 1g - 3g polymer powder.

The following factors should be considered in the selection of PAM concentration:

Mixing tank is small and daily dosage is large. It is recommended to mix slightly stronger (e.g. 0.3%).

When the polymer molecular weight is very high, it is recommended to mix slightly thinner (such as 0.1%).

When polymer solution is thrown into sewage, if the dispersion condition is not good due to equipment reasons, it is recommended to be slightly diluted.

In short, excessive polymer concentration will cause excessive load of stirrer motor and poor dispersion after entering sewage, affecting the use effect. It helps to use it sparsely.

4, the prepared solution should not be transferred by centrifugal pump, so as to avoid shear degradation of polymer caused by high-speed rotating blades. The specific method of preparation is as follows: add a certain amount of water into the dissolving device (such as the beaker in the laboratory, and the matching tank in the factory), calculate the amount of powdery polymer required by the amount of water and concentration, and weigh the polymer.

(1) According to the polymerization formula, weigh acrylamide aqueous solution, quaternary ammonium salt monomer and deionized water into the mixing container.

(2) Stir for 15: min, and adjust pH to a predetermined value with a small amount of concentrated HCl solution.

(3) After adjusting the temperature to a predetermined value, transfer the solution into a polymeric bag in the insulation container with a certain amount of azo initiator, and install the temperature recorder. Nitrogen was blown for 30min to remove oxygen. (Initiator and dosage v65:1000mGE /L; PA - 5:20mFF /L: Per: 40mg/L: CuS04:0.25mff /L; EDTA: 0.73mg /L: NaFS: 40Rag /L.)

(4) add a certain amount of oxidant, reducing agent and other additives as required. Stop blowing nitrogen and seal.

(5) After 4h reaction, the polymeric glue was removed and cooled at room temperature. (polymerization reaction conditions reaction temperature: 20%; Reaction pH: 7.)

(6) Cut the rubber blocks into blocks and granulate them with a cooking machine.

(7) Put them into 60℃ oven for drying for 12h.

(8) Grinding, screening, bagging.

(9) Analysis of solid content, relative molecular weight and other indicators.

Cationic polyacrylamide use matters for attention: 1, the size of flocculation: flocculation is too small will affect the speed of drainage, flocculation is too large so that the flocculation constraint more water and reduce the mud biscuit degree. By choosing the molecular weight of polyacrylamide can adjust the size of the floc.

2, sludge characteristics. The first point is to understand the source, characteristics and composition of the sludge, the proportion. According to different properties, sludge can be divided into organic and inorganic sludge. Cationic polyacrylamide is used for the disposal of organic sludge, relative anionic polyacrylamide flocculant for inorganic sludge, strong alkaline with cationic polyacrylamide, and strong acid should not be used anionic polyacrylamide, high solid content of sludge usually polyacrylamide dosage is also large.

3, flocs strength: flocs should be stable and not broken under shear action. Improving the molecular weight of polyacrylamide or choosing suitable molecular structure can improve the stability of the flocculation.

4, polyacrylamide ionic degree: for dehydrated sludge, can use different ionic degree of flocculant after doing the first test stop selection, select the best suitable polyacrylamide, so that can get the best flocculant effect, and can make the dosage of the least, save money. 5, the dissolution of polyacrylamide: good solubility can give full play to flocculation. Sometimes the need to accelerate the dissolution rate, then you can think of improving the concentration of polyacrylamide solution.

Common areas 1, as flocculating agent, mainly used in industrial solid-liquid separation process, including settlement, clarification, concentration and sludge dewatering technology, application of the main industries are: urban sewage treatment, paper industry, food processing, petrochemical industry, metallurgical industry, mineral processing industry, dyeing industry and sugar industry and all kinds of industrial wastewater treatment. Used in urban sewage and meat, poultry, food processing wastewater treatment process of sludge precipitation and sludge dewatering by its organic colloid electrical group of sludge negative charge neutralization and excellent polymer bridging coagulation function, prompting colloid particles gathered into large pieces of floc, separated from the slurry. The effect is obvious and the dosage is small.

2, in the paper industry can be used as paper dry strength agent, retention agent, filter agent, can greatly improve the quality of paper, cost saving, improve the production capacity of paper mill. Can directly and inorganic salt ions, fibers and other organic polymers electrostatic bridge effect to enhance the physical strength of the paper, reduce the loss of fiber or filler, speed up water filtration, enhance, help to stay, help to filter, can also be used for white water treatment, at the same time, in the process of deinking can play a significant flocculation effect.

3, fiber mud (asbestos-cement products) can make the forming of asbestos-cement products drainage is improved, so that the strength of asbestos slab is improved; In the insulation board, the combination of additive and fiber can be improved.

4, in mining, coal preparation industry can be used as mine wastewater, coal washing wastewater clarification agent.

5, can be used for dyeing wastewater, leather wastewater, oily wastewater treatment, turbidity removal, decolorization, in order to meet the discharge standard.

6. In the purification of phosphoric acid, it is helpful to the separation of gypsum in the wet phosphoric acid process.

7. Flocculant for water treatment in waterworks with river water sources.

Flocculant polyacrylamide dissolution method and storage conditions

Polyacrylamide is a water-soluble polymer. In general, granular polyacrylamide can be stored in a dry and cool place for more than two years. After the solution is prepared, its storage time is very limited. Generally speaking, when the solution concentration is 0.1%, the non-anionic polymer solution does not exceed one week; Cationic polymer solution does not exceed