Testing the effectiveness of polyacrylamide emulsion on treating grain oil production wastewater involves several steps, from sample collection to analysis. Here is a general procedure you can follow:

Materials Needed

• Grain oil wastewater sample
• Polyacrylamide powder (prepared as per the previous guideline)
• Beakers or containers
• Magnetic stirrer
• pH meter
• Lime water
• Flocculation testing apparatus (e.g., jar test apparatus)
• Filtration apparatus
• Chemical dosing equipment
• Spectrophotometer (for further analysis of contaminants if needed)

Testing Procedure

1. Sample Collection:

• Collect samples of grain oil production wastewater in clean containers. Ensure that the samples are representative of the wastewater being treated.

2. Initial Characterization:

• Adjust pH: Use a Lime water to adjust the initial pH of the wastewater.
• Visual Assessment: Examine the color and clarity of the wastewater. Note any visible contaminants.

3. Preparation of Polyacrylamide powder:

• Ensure that you have a prepared solution of polyacrylamide, as discussed in the previous procedure. This can be used for the flocculation process.

4. Flocculation Test (Jar Test):

• Setup: Prepare a series of beakers for different doses of polyacrylamide(e.g., 0, 5, 10, 15, 20 mg/L).
• Add Wastewater: Add equal volumes of the wastewater sample to each beaker (e.g., 500 mL).
• Add Polyacrylamide: Add the specified amount of polyacrylamide emulsion to corresponding beakers.
• Mixing: Stir the solutions at a rapid speed (e.g., 200 rpm) for about 1-2 minutes, then slow down to a lower speed (e.g., 30 rpm) for an additional 5 minutes to allow floc formation.

5. Settling Time:

• Stop stirring and allow the flocs to settle for a predetermined time.

6. Post-Treatment Analysis:

• Visual Assessment: Observe and note the clarity and color of the treated water.
• pH Measurement: Measure the final pH of the treated samples.
• Filtration: Filter the supernatant from each beaker to evaluate the effectiveness of the flocculating agent further.

7. Additional Testing (if needed):

• Use additional tests such as COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand), or specific contaminant analysis (e.g., heavy metals, dyes) using a spectrophotometer to assess the effectiveness of the treatment further and compare results with the initial values.

Safety Precautions

• Wear appropriate PPE (gloves, goggles, lab coat) while handling wastewater samples and chemical agents.
• Handle all chemicals and equipment according to safety guidelines.

Conclusion

This procedure provides a systematic approach to assessing the effectiveness of polyacrylamide on treating grain oil production wastewater. It's important to optimize the concentration of polyacrylamide based on the characteristics of the specific wastewater being treated for best results.