The Cause And Solution Of The Caking When Polyacrylamide Dissolves

There is a thin layer of colloidal residues and some large flocs on the wall and the bottom of the tank in many wastewater treatment plants. No matter how you stir it and how long it takes, these residues are hard to dissolve, and it will often cause unnecessary trouble if they are not properly treated.

Polyacrylamide is an organic polymer flocculant water treatment, the molecular weight is relatively large, generally in the millions of levels. When dissolve Polyacrylamide, it swells first, and then dissolves slowly. If the amount of polyacrylamide added to water in one time is large and cannot be added evenly and slowly, the polyacrylamide that touches water first begins to swell, the surface area becomes larger, and then envelops the part that does not touch the water, thus forming some insoluble polyacrylamide groups. At present, most wastewater treatment plants generally use manual dosing. It is suggested that the water should be stirred up first, and then dosing slowly and evenly distributed above the water column through the inlet. It can reduce the probability of the caking problem, when the potion is washed into the water along flow direction, and to avoid contact with the inside of the tank as much as possible.

It is suggested that the automatic continuous feeding system should be adopted as far as possible when conditions permit, which not only saves manpower and improves efficiency, but also avoids caking as much as possible When you add PAM. In addition, the quality of polyacrylamide on the market is uneven at present. Some products have quality defects, such as poor hydrophilicity, insoluble substances, poor solubility and so on, which tend to agglomerate when adding PAM.

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How To Make Polyacrylamide Work Best

The three important indexes of polyacrylamide are molecular weight, hydrolysis degree, and solid content. There are three main indicators of cationic polyacrylamide: ionicity, solid content and molecular weight. The molecular weight of anion polyacrylamide is from 6 million to 22 million, and the cationic polyacrylamide ionicity is from 20 percent to 60 percent. Recently, a number of customers in different fields have reported that adding polyacrylamide is not very effective. Water purification materials for rivers suggest that corresponding anion or cationic products should be selected according to on-site sewage treatment process and equipment.

Then, why the effluent treatment of polyacrylamide PAM fails to achieve the effect mentioned by the manufacturer? The reasons are analyzed along with the source water purification material：

1. Dissolution time: after polyacrylamide dissolves into liquid, it should be used as soon as possible. With the increase of storage time, the agent will degrade with time, and the lower the liquid viscosity, the more influence the sewage treatment effect will be. In general, polyacrylamide liquids can be stored for about 1-2 days. And the solid polyacrylamide storage time is longer, in general, customers are recommended to use polyacrylamide water solution now.

Ratio of 2, temperature influence: polyacrylamide liquid, the temperature reaches 60 ℃ began to slow degradation, 22 million molecular weight of anionic flocculant in high temperature reaches a certain degradation to around $5 million, or even destroy the molecular chain structure, effect use effect with the increase of temperature, the degradation of faster and faster.

Marketing Center: Room 603, RuiYing Building, Chengnan 1st Road, Dali Town, Nanhai District, Foshan City, Guangdong Province,China, 528231

Factory: Area A No.9, Technology Park, Sanshui District, Foshan, Guangdong, China

Tel : +86 13929123248

Email : exp006@broviecn.com

Fax : 0086-0757-85510580

Website : http://www.bv-chem.com

Is Polyacrylamide A Dangerous Chemical

Many customers or purchasers do not know about polyacrylamide products when they buy them. In addition to asking the price, there will be many questions. For example, the product specification, type, index, etc., among which the most question is whether polyacrylamide belongs to the dangerous chemicals?

First of all, is it harmful to human body? I hope I can help you by explaining these questions. Polyacrylamide product appearance is white powder, soluble in water, almost insoluble in benzene, ether, ester, acetone and other general organic solvents, its aqueous solution is almost transparent thick liquid, non-hazardous, non-toxic, non-corrosive. After entering the human body, polyacrylamide is mostly eliminated from the body in a short time, rarely absorbed by the digestive tract, so it is not toxic. Most commodities also do not irritate the skin, with only some water disintegrating likely to have residual alkali, which can irritate when exposed repeatedly and over a long period of time.

The U.S. food and drug administration considers PAM and its water breakup to be low toxicity or nontoxic. The toxicity of PAM comes from the residual acrylamide monomer and toxic metal during production. Acrylamide is a kind of neurotoxic agent that can damage the nervous system. Therefore, the health departments of all countries have stipulated the content of acrylamide remaining in industrial products of polyacrylamide, generally 0.5-0.05%. The content of acrylamide should be less than 0.2% when applied to the general purification treatment of water, and less than 0.05% for direct drinking water treatment. Currently, it is generally stipulated in major European and American countries that the residual acrylamide content in drinking water treatment and food is less than 0.05%, and the amount of PAM is strictly controlled. For flocculation of drinking water treatment, food grade products should be used as appropriate. Select food grade quality, low residual value of polyacrylamide products, can ensure the health and safety of drinking water.

Polyacrylamide in the use of water treatment process, the advantage of its strengthening flocculation and filtration processability, improving water quality, increase water quantity, cost savings are accepted by more and more water supply enterprises. Polyacrylamide applied in the field of drinking water treatment is being developed constantly, its prospects are very positive. So polyacrylamide is not belonged to the dangerous chemicals. Transportation is unregulated.

Marketing Center: Room 603, RuiYing Building, Chengnan 1st Road, Dali Town, Nanhai District, Foshan City, Guangdong Province,China, 528231

Factory: Area A No.9, Technology Park, Sanshui District, Foshan, Guangdong, China

Tel : +86 13929123248

Email : exp006@broviecn.com

Fax : 0086-0757-85510580

Website : http://www.bv-chem.com

A cost-saving method for the use of polyacrylamide

Polyacrylamide is a linear polymer, widely used in water treatment, paper, mineral processing, oil fields, etc., but the price of PAM is more expensive in the current market, so polyacrylamide need to save the use, how to reduce the cost of PAM?
1. To save cost in the use of polyacrylamide, we first need to choose the model of polyacrylamide, the principle is to choose the best effect of their own wastewater treatment. Expensive polyacrylamides are not necessarily suitable for their own factory wastewater treatment, and the cheaper one maybe lead to the treatment of wastewater effect is poor, but will increase the cost.

2.  Polyacrylamide is generally solid particles, the use of a solution that needs to be configured into a certain solubility, the concentration is usually between 0.1% and 0.3%, too thick or too thin will affect the effect, waste agents, increase the cost.
3. When the polyacrylamide is in an aqueous solution, it usually takes 30 to 50 minutes for the polyacrylamide to fully dissolve, a suitable stirring device is required for the solution, and if the temperature is low, the solution time is increased.

Marketing Center: Room 603, RuiYing Building, Chengnan 1st Road, Dali Town, Nanhai District, Foshan City, Guangdong Province,China, 528231

Factory: Area A No.9, Technology Park, Sanshui District, Foshan, Guangdong, China

Tel : +86 13929123248

Email : exp006@broviecn.com

Fax : 0086-0757-85510580

Website : http://www.bv-chem.com