1 , flocculation : PAM allows suspended material by charge neutralization , bridging adsorption, flocculation effect .
2 , the adhesive : through mechanical, physical, chemical action , since the adhesion effect.
3 , lowering resistance : PAM can effectively reduce fluid friction , water with traces of PAM can be 50-80% reduction in resistance .
4 , thickening: PAM thickening effect in neutral and acid conditions, when the PH value above 10 PAM easily hydrolyzed . When a semi- mesh structure , thickening more obvious.
Polyacrylamide usage instructions
1 , the number of washing with the use of cationic polyacrylamide can be set from 30 kg to one hundred and ten kilograms ; wastewater usage of the chemical industry is generally between fifty to one hundred and twenty kilograms ; dyeing industry wastewater and paper industry wastewater difficult to deal with , should increase the number used to set the number to use in one hundred to three hundred kilograms more reasonable , electroplating wastewater industry and general industrial water is generally not more than fifty kilograms . Note : ( number of industries are using this number several thousand tons of wastewater each ) .
2 , sewage treatment methods depending on Desliming flocculant used is not the same .
If the process the body uses biochemical methods , that is, sludge dewatering ( probably containing some early silt ) , just as sludge dewatering agent cationic PAM can .
If the process the body uses physical methods, such as an enhanced loading magnetic separation process, the general is to add PAC quenched , then add the anionic flocculant , and finally add cationic flocculant dehydration. Specific dosage should be based on effluent quality .
There are many sewage treatment station , sludge dewatering added directly PAC or other inorganic flocculants can be, in this frame filter, especially electronics factory or a small sewage treatment plant used widely.
When PAM sludge dehydrating agent as generally used in a ratio of 0.1% water – 0.2 %. Dissolved into a glue -like liquid in the future , then vote added to the sludge mixed treatment .
And sludge ratio is generally 5% – 10% , and some less , this should be determined according to the concentration of the sludge , it is best to determine the optimal dosage and usage models beaker through field experiments . Different sludge, different agents , the treatment effect of different equipment, different management levels , the sludge is different.
3, the sewage treatment plant with a cationic polyacrylamide as sewage sludge dewatering operations agent . In the process , and customer communication , customers often asked in the process of wastewater treatment sludge dewatering , sludge dewatering agent dosage problems. To know the exact opposite sludge dewatering agent dosage , first of all understand these parameters , the moisture content of the sludge , mud cake moisture content , into the mud , into the amount of drugs, pharmaceuticals concentration.
Sludge moisture content: the percentage of moisture contained in the sludge and sludge than the weight of the total weight of the moisture content of the sludge is called .
Cake moisture content : The percentage off the sludge cake that is contained in the water weight and the ratio of the total weight of the sludge cake moisture content is called .
But also through the following formula for computing
1 dosage mg / L = Dosing Quality / Water treatment / dispensing concentration
2 , treated water dosing dose = treated water m3 / h * dosage g/m3
3 , the amount of dry sludge treated water * = [ (1 - sludge moisture content ) / (1 - cake moisture content ) ]
4 , pharmaceutical consumption per ton of dry clay dosage g/m3 = / dry mud
The above result of the calculation error may be relatively large , only made ​​with reference to water running. The actual amount of consumption of the drug you want to actually test machine operators