How to judge the overdosing of PAC and PAM?

The way to effectively prevent excessive use of PAM and PAC is experimentation.
　　
Small experiments,field trials,etc.,or use PAM to judge the amount of PAM and PAC by observing the water quality.
　　
We know that PAC is a water treatment agent that destabilizes and agglomerates colloids,and PAM is a water treatment agent that makes agglomerated tiny flocs into larger flocs.
　　

How to use PAM and the identification of its dosage:
　　
1.The higher the solid phase content,the greater the amount of flocculant used.
　　
Select the molecular weight of the flocculant according to the size of the floc required by the treatment process.
　　
The ionic type of polyacrylamide must be screened through experiments.
　　
2.The strength of the floc can be improved by increasing the molecular weight of the flocculant.
　　
The flocculant must be thoroughly mixed and dissolved with the sludge before treatment.
　　
The choice of flocculant must fully consider the requirements of the process and equipment.
　　
Steps to determine the dosage in the PAC usage method:
　　
1.According to the different conditions of the raw water,do a small test to get the best dose before use.
　　
For the convenience of calculation,the small test solution is configured according to the weight ratio (W/W),generally 2～5% is better.
　　
2.Dosing according to the best dosing amount obtained in the small test, and pay attention to observation and adjustment during operation.
　　
If you see that the sedimentation tank has little alum blooming and the residual turbidity is large,the dosage is too small;if the sedimentation tank is large and upturned,and the residual turbidity is high,the dosage is too large and should be adjusted appropriately.
　　
Why do we need to find a way to prevent overuse of PAM and PAC?
　　
Let’s understand the hazards of these overdose
　　
1.The preparation concentration of PAM is generally about 0.1-0.2%. The low concentration is good for mixing and saving medicine;
　　
2.PAC solids are customarily formulated as 10% (weight to volume ratio),which is convenient for measurement.
　　
3.Excessive PAM will reduce the coagulation effect of some water quality,and the toxicity caused by the secondary pollution of the water body cannot be ignored.For organic flocculants,the production cost is generally high,and organic flocculants (such as polyacrylamide)
　　
The degradation monomers of) cause secondary pollution to the water body,so the application of organic flocculants in water treatment is restricted,especially in the treatment of drinking water.