Method for selecting flocculant when treating sludge by sludge dewatering machine
When sewage and sludge are treated by a sludge dewatering machine, some flocculants are often needed to achieve better treatment effects. When choosing a suitable flocculant, we generally start with the following four aspects.
1. Properties of sludge
For sludge with high organic content, the more effective flocculant is cationic. The higher the organic content, the higher the degree of polymerization of cationic flocculant. For inorganic sludge, anions can be considered. The difference in sludge properties directly affects the conditioning effect, scum and excess activated sludge are more difficult to dewater, and the dewatering performance of mixed sludge is somewhere in between.
Generally speaking, the more difficult to dewater the sludge flocculating dose, the finer sludge particles will lead to an increase in flocculant consumption, and the high organic content and alkalinity in the sludge will also lead to an increase in the flocculant dosage. In addition, the solid content of sludge also affects the dosage of flocculant. Generally, the higher the solid content of sludge, the greater the dosage of flocculant when using a sludge dehydrator.
2. Sludge pH
The pH of the sludge depends on the form of the hydrolysate, and the same flocculant has very different treatment effects on sludge with different pH. The hydrolysis reaction of aluminum salt is greatly affected by the acidity and alkalinity, and the acidity and alkalinity of the condensation reaction ranges from 5 to 7. Ferric salt conditioners are less affected by pH, and the pH range is 6-11. In sludge with a pH of 8-10, ferrous salts can be oxidized into flocs with lower solubility in hydrolyzed products with higher solubility.
Therefore, when selecting inorganic salt flocculants, the specific pH of the dewatered sludge must first be considered. If the pH deviates from the range of its coagulation reaction, replace it with another one. Otherwise, it is necessary to consider adding acid or alkali to adjust the pH of the sludge before conditioning the sludge.
3. Concentration of flocculant
The concentration of the flocculant not only affects the conditioning effect, but also affects the consumption of the agent and the output rate of the sludge dewatering machine mud cake. Among them, the effect of organic polymer flocculant is more significant. Generally speaking, the lower the concentration of the organic polymer flocculant, the less the consumption of the agent and the better the conditioning effect.
However, if the preparation concentration is too high or too low, the yield of mud cake will be reduced. The conditioning effect of the inorganic polymer flocculant is almost not affected by the concentration of the formulation. The concentration of the organic polymer conditioning agent is between 0.05% and 0.1%. The concentration of ferric chloride is 10%, and the concentration of aluminum salt is between 4% and 5%.
Fourth, the temperature of the mixed treatment liquid
The temperature of the sludge directly affects the hydrolysis of the flocculant. When the temperature is low, the hydrolysis will slow down. If the temperature is lower than 10°C, the flocculation effect of the sludge dehydrator will be significantly worse. The conditioning effect can be improved by appropriately extending the flocculation time. When the temperature is low in winter, attention should be paid to the heat preservation of the sludge dewatering machine, which should not be lower than 15°C to minimize the heat loss during the sludge transportation process.
- Introduction to the use characteristics of sewage purification vehicles
- Precautions for operation of laminated sludge dewatering machine
- Selection standard of sludge dewatering machine
- The processing method of the fixed ring of the ring piece of the screw stacking machine
- How to adjust the high water content of the stacked screw sludge dewatering machine
- What does the settling time of the snail sludge dewatering machine depend on?
- Correct use of screw stacking machine
- What is the processing effect of the screw stacking machine?
- Precautions for the safe use of stacked screw sludge dewatering machine
- The difference between traditional septic tank cleaning and sewage suction purification truck cleaning
- Reasons for the high moisture content of the screw stacking machine
- Analysis on the Root Causes of Sludge Run-out of the Screw-in Type Sludge Dewatering Machine
- Reasons and solutions for the slow operation of the stacked screw sludge dewatering machine
- What factors will cause the high water content of the snail stacking machine
- The advantages of the new screw stacking machine are gathered
- What to pay attention to when using the stacked screw sludge dewatering machine
- How to choose a suitable sludge dewatering machine
- The stacked screw sludge dewatering machine removes the larger particles in the mud 3mm
- Several aspects that need to be considered when choosing a model of sludge dewatering equipment
- What is the difference between a vehicle-mounted screw stacker and a filter press