Discuss the application of polyacrylamide in drinking water treatment safety is qualified Discussed the safety of polyacrylamide used in drinking water treatment is qualified Polyacrylamide itself is basically non-toxic, because it enters the body, most of the discharge in the short term In vitro, rarely absorbed into the digestive tract. Most commodities do not irritate the skin, and only some of the hydrolysates may have residual alkaloids which can be irritating when exposed repeatedly and for long periods of time. The U.S. Food and Drug Administration believes that PAM and its hydrolyzate are either low or non-toxic. The toxicity of PAM comes from the residual acrylamide monomer and the toxic metals entrained in the production process. Acrylamide is a neurotoxic agent that has a damaging effect on the nervous system. After poisoning, symptoms such as muscle weakness and ataxia are displayed. Therefore, the health authorities in all countries have provisions polyacrylamide residual acrylamide in industrial products, generally 0.5% --- 0.05%. Applied to the general purification of water, acrylamide content of 0.2% or less, for direct drinking water treatment, the need for less than 0.05%. International Health Organization, born in 1985, polyacrylamide standards that: PAM AM residues below 0.05% control and dosage, the treated water content will be less than 0.25ug / L, in line with most of the drinking water standards . At present, the major countries in Europe and America generally stipulate that the residual AM content in drinking water treatment and food-use PAM should be below 0.05% and control the amount of PAM. Certain cationic polyacrylamides are much more complex due to the amino group and other groups introduced with cationic polyacrylamides, which tend to be more toxic than anionic and nonionic in tens to hundreds of times, and they The chronic toxicity is under further study. For the flocculation of drinking water treatment should be used food-grade products as appropriate. Under the Water Supply and Drainage Standards Manual Water Treatment Standards, the non-routine use of polyacrylamide is defined as & gt; 0.1 mg / L and & lt; 0.1 mg / L for regular use. In the water treatment process coagulant applications, the amount of its use of the standard value for the maximum dosage, the purchase of food grade high quality, low residual polyacrylamide products, you can ensure the health and safety of drinking water. If a water plant to use polyacrylamide to aid coagulation, the maximum dosage of 0.09mg / L, the use of chemical polyacrylamide engineering center of Guangzhou Chemical Industry Department, filter out the water and tap water found no acrylamide monomer . Therefore, as long as we can control the quality of products and dosage, the polyacrylamide coagulation process, in terms of drinking water hygiene is safe. The near future, China's application of polyacrylamide organic products as water treatment agent, with the scope of water quality will be expanded, the national requirements for drinking water and gradually expand. For example, when a water company increased its water consumption by 97% from 1997 to about 8 times, the number of water utilities increased from one to six. The use of a coagulation, coagulation aid, help filter. According to reports, before adding polypropylene filteration 0.015 --- 0.05mg / L can be filtered to improve the production capacity of 10--16%, but in increasing the filter week, the head loss also increased at the same time, recoil time and intensity But also a corresponding increase, but in contrast, adding polyacrylamide filter aid in the economy is cost-effective, adding polyacrylamide filter aid to prevent algae from penetrating the filter, in the event of an accident, to ensure that the filter After the water quality, the domestic water supply has been applied water filtration process, received good results. Polyacrylamide organic products in the use of water treatment processes, which strengthen the flocculation and improve the filter capacity, improve water quality, increase water consumption, cost-saving advantages are more and more willing to accept the water supply enterprises, polyacrylamide in the The application of drinking water treatment field is being continuously researched and developed, and its prospect is optimistic.