english 1. Optimize operating parameters
The pressure and residence time in the air dissolving tank are the key. Usually, the pressure needs to be maintained at 0.3-0.5MPa, and the residence time is controlled at 10-15 minutes to ensure that the air is fully dissolved to form high-quality dissolved air water. At the same time, the water flow rate should be stabilized to avoid uneven contact and insufficient attachment of bubbles and particles due to flow fluctuations. Generally, the fluctuation range of water flow rate is controlled within ±5%.
2. Accurately control the addition of reagents
The selection and dosage of flocculants and coagulants directly affect the treatment effect. It is necessary to screen suitable reagents through beaker tests based on the characteristics of the wastewater, such as pollutant composition, concentration, pH value, etc. For example, when treating oily wastewater, polyaluminum chloride (PAC) can be used in combination with polyacrylamide (PAM). At the same time, strictly control the dosage of the agent. The dosage of PAC is generally 50-200mg/L, and that of PAM is 1-5mg/L. Excessive or insufficient dosage will reduce the flotation efficiency.
3. Regular equipment maintenance
Perform regular inspection and maintenance on equipment such as dissolved air tanks, releasers, and scrapers. Clean impurities in the dissolved air tank in time to prevent blockage; check whether the micropores of the releaser are unobstructed. If there is blockage, high-pressure water flushing or chemical cleaning is required; ensure that the scraper operates normally to avoid the re-entry of floating scum into the water body due to untimely scraping.
4. Real-time monitoring and feedback
Use online monitoring instruments to monitor parameters such as influent water quality (such as suspended matter concentration, oil content), dissolved air tank pressure, and flotation tank water level in real time. Once an abnormality is found, such as a sudden increase in the concentration of suspended solids, immediately adjust the operating parameters or increase the dosage of the agent, and summarize the rules through historical data comparison and analysis, and continuously optimize the system operation.
