- How to choose right polyacrylamide?
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How to choose right polyacrylamide?
Normally,the polyacrylamide can be divided into inorganic and organic polyacrylamide.we should choose the right polyacrylamide according to the characteristics of the wastewater.meanwhile,we should know which prosess the polyacrylamide will be added and what it is used for.
How to choose polyacrylamide depends on the concerntration of the colloid and suspended matter in the water.if the pollutants show colloidal state,we should choose inorganic polyacrylamide to make it destablization and flocculation,if the floc is small,we need to add high molecular polyacrylamide or can be used in conjuction with activated silica gel as coagulant aid。It can obviously improves the effect of coagulation and expand the application range if the inorganic floccluant be used in concert with the organic polyacrylamide.for high molecular,for the high molecular, the charge on the chain-shaped molecular is greater ,the charge is higher and the chain can be extend fully,the effective range of absorption and bridging is also bigger,the flocculent effect is better.we should consider the composition and PH value of the wastewater when choosing the inorganic polyacrylamide ,and then choose the optimum model.we should consider if it is anionic PAM or cationic PAM or nonionic PAM when choosing the organic polyacrylamide.the anionic PAM can be divided to weak ,medium and strong anionic PAM according to the different hydrolysis degree.the cationic PAM mainly used for sludge dewatering,the selection test is very important,for municipal sewage treatment,we often use cationic PAM with medium or strong ionicity.the cationic PAM with weak ionicity often be used for the sludge dewater of papermaking and dyeing plant.the cationic PAM with strong ionicity often be used for medical wastewater treatment.
Choosing the right polyacrylamide according to the following the aspects:
1.the molecular structure:the molecular structure of polyacrylamide depends on the dewatering performance be required.the structure of cationic polyacrylamide as follows:
linear structure:after choosing the right molecular weight,the dosage is small and the dewatering performance is better if we make the dewatering treatment using linear polyacrylamide.
Dendritic structure:medium dosage,can obtain better dewatering performance.
corss-linked structure:big dosage but can get special water filtering and and shear resistance performance
2.the molecular weight::The choice of molecular weight depends on the types of dewatering equipment, and molecular weight are also said the length of the polymer chain. For centrifuge equipment , the higher of the molecular weight the better of the application result, because in centrifugal dewatering engineering, floc will be subject to a large shear force. For the filter type equipment:,the lower molecular weight to the medium molecular weight polyacrylamide meet the requirement, meanwhile,we can get a good water filtering performance..
3．Choosing the polyacrylamide charged according to the type of particles in waste water. In general, we will use the polyacrylamide with negatively charged to capture the particle in inorganic sewage , treat organic particles with positively charged polyacrylamide , of course, we have to confirm the the best polyacrylamide throught simple test and pratice on machine.
4.polyacrylamide charge density (ionic degree): that mean the quantity that the polyacrylamide will be positive charge or negative charge to get the best flocculent result if the caseof minimum quantity. the charge density is related to the type of sludge, municipal sludge is often a function of the content of organic matter in the sludge,the organic content is related to the content of Volatile components.the higher of the Volatile content,the higher charge of the polyacrylamide we need.
Each kind of waste water has its own unique characteristics, nonionic polyacrylamide is mainly used in acidic condition, printing and dyeing mill often use nonionic PAM. We can only confirm the final model according to the selection test .we can confirm the economic and optimum polyacrylamide according to the dosage , flocculent and sedimentation result and the cost.