Polyacrylamide selection programs and precautions:
① flocculant selection must take full account of the process and equipment requirements.
② can increase the flocculant molecular weight to improve the strength of flocs.
③ flocculant charge value must be screened by experiment.
④ climate change (temperature) affect the selection of flocculants.
⑤ according to the size of flocs to process the choice of flocculant molecular weight.
⑥ flocculant before treatment must be fully mixed with the sludge dissolved.