In the laboratory, determining the optimal dosage of polyacrylamide (PAM) can usually be done through the following steps:

Prepare experimental samples: Take a certain amount of sewage sample, usually 500 milliliters, and divide it into multiple identical beakers.

Add PAM of different concentrations: Add PAM solutions of different concentrations (such as 1 ‰, 2 ‰, 3 ‰, etc.) to each beaker to ensure that the amount of PAM used in each beaker is different, in order to compare the effects.

Stirring and settling: Quickly stir the water sample with PAM added, usually for 30 seconds to 2 minutes, and then let it stand for a period of time (e.g. 2 hours) to observe the flocculation effect.

Observation effect: Observe the clarity of the supernatant in each beaker, record the amount and settling speed of the sediment. Ideally, the optimal dosage should make the supernatant as clear as possible and minimize the amount of sediment.

Measuring water quality indicators: COD, SS (suspended solids), ammonia nitrogen and other water quality indicators of the supernatant can be measured to quantify the treatment effect of different PAM dosages.

Comparison and analysis: Compare the treatment effects of PAM with different dosages, and ｓｅｌｅｃｔ the dosage with the clearest supernatant and the least sediment as the optimal dosage.

Fine tuning and confirmation: Based on the initially determined optimal dosage, fine tuning experiments can be conducted to further confirm the optimal dosage.

Through the above steps, the optimal dosage of PAM can be effectively determined to achieve the best sewage treatment effect.

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