Flocculants, as the main treatment agents in the wastewater treatment industry, are known chemically as polyacrylamide and have excellent applications in the wastewater sector. Flocculants are a type of high molecular polymer, and their fields of use are continuously expanding. No content provided. Our product has been expanded in various applications, particularly in industrial wastewater and urban sewage treatment fields. Flocculants have proven to be highly effective in industrial wastewater treatment, especially for wastewater containing suspended particles, high concentrations, and positively charged particles, such as from steel mills, electroplating plants, and metallurgical processes. Coal washing The wastewater treatment has proven to be very effective.
Flocculants in the Process of Industrial Wastewater Treatment
One: Coagulation Stage: When adding polyacrylamide flocculant, it is the process of the liquid being injected into the sedimentation pool and rapidly coagulating with the raw water in an extremely short time to form fine floc. At this point, the water body becomes more turbid, and it requires the water flow to generate intense turbulence. In the beaker experiment, it is advisable to stir rapidly (250-300 rpm) for 10-30 seconds, usually not exceeding 2 minutes. The effect at this time is ideal.
Stage Two: Flocculation Phase - This is the process where the floc grows and becomes thicker, requiring an appropriate degree of turbulence and sufficient residence time (10-15 minutes). In the later stages, a significant amount of floc can be observed slowly sinking, forming a clear surface layer. The beaker test involves stirring at 150 RPM for approximately 6 minutes, followed by stirring at 60 RPM for about 4 minutes to achieve a suspension state. Check the reaction; if the results are unsatisfactory, adjust the dosage of the flocculent solution promptly.
Three: Sedimentation Phase: Treatment of domestic wastewater and organic waste. Flocculants exhibit cationic properties in both acidic and alkaline media, allowing for flocculation and sedimentation of wastewater suspended particles that carry a negative charge. This process is carried out in a sedimentation tank, requiring slow water flow. To enhance efficiency, a inclined plate sedimentation tank (using the air flotation method for separating the flocs) is generally employed. A large amount of coarse floc is blocked by the inclined plate walls and settles at the bottom of the tank, with the upper layer being clear water. The remaining fine and low-density flocs continue to descend slowly while colliding and coalescing into larger ones, resulting in relatively constant residual turbidity in the later stages. The beaker test should be performed with slow stirring at 20-30 rotations per minute for 5 minutes, followed by a 10-minute static sedimentation, and then measuring the residual turbidity to determine the appropriate dosage. This preparation is for subsequent work.
Additionally, there are certain requirements for the reaction pond when using flocculants. If there are too many polluted particles or too large impurities entering the reaction pond, it will affect the flocculation effect of the flocculant. Therefore, when in use, it is generally placed at the inlet of the reaction pond to filter out large particles of impurities, improving the reaction quality of the flocculant.
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