I. The following aspects should be considered when selecting flocculants

1. Climate change (temperature) affects flocculant selection;

2. Sludge and wastewater concentration affects flocculant selection;

3. On-site dissolved water quality also affects flocculant selection;

4. Whether to add inorganic flocculants before adding PAM, and the addition ratio, will affect flocculant selection;

5. Select the molecular weight of the flocculant according to the floc size required by the treatment process. Increasing the molecular weight of 

the flocculant can improve floc strength;

6. The selection of flocculants must fully consider the requirements of the process and equipment.

II. How to Determine if PAM Selection is Successful

The effectiveness of flocculation is mainly judged by the settling velocity, the compression ratio of the bottom sediment, and the clarity of the 

supernatant.

Settling velocity refers to the settling speed of suspended solids after the addition of polyacrylamide emulsion;

Settling ratio refers to the aggregation of sludge at the bottom and the clear separation ratio between sludge and water;

Filtrate clarity refers to the clarity of the supernatant after settling.