Sludge flocculation is a common problem in sewage treatment, which may be caused by various reasons. The following are some common reasons and corresponding solutions:
reason:
-Nutrient deficiency: Microorganisms in sludge require sufficient nutrients to maintain normal growth and metabolism. If the nutrients (such as nitrogen, phosphorus, etc.) in the influent are insufficient, microorganisms may not be able to grow normally due to the lack of nutrients, leading to sludge flocculation.
-Low water temperature: Low temperature can affect the activity and metabolic rate of microorganisms. When the water temperature is too low, the growth of microorganisms in the sludge is slow, which may lead to sludge flocculation.
-Abnormal pH value: Microorganisms in sludge have a certain adaptation range to pH value. If the pH value of the influent is too high or too low, exceeding the tolerance range of microorganisms, it may damage the structure of the sludge and lead to flocculation.
-Toxic substances: If the influent contains substances that are toxic to microorganisms, such as heavy metals, organic matter, etc., it may cause microbial death or inhibition of activity, leading to sludge flocculation.
-Excessive aeration: Aeration is used to provide the oxygen required by microorganisms, but if it is excessive, it can cause excessive shear force on the sludge flocs, leading to sludge disintegration.
measures:
-Supplementing nutrients: According to the water quality of the inflow, nitrogen, phosphorus and other nutrients should be reasonably supplemented to ensure that microorganisms have sufficient nutrition for growth and metabolism.
-Control water temperature: In winter or when the water temperature is low, insulation measures can be taken, such as adding insulation layers and increasing the inlet water temperature, to maintain the normal operation of the sludge system.
-Adjust pH value: Regularly monitor the pH value of the incoming water. If there are any abnormalities, take timely measures to adjust it, such as adding acid-base neutralizing agents, to maintain the pH value within the appropriate range (usually 6-9).
-Removing toxic substances: Strengthen the pre-treatment of incoming water to remove or reduce the concentration of toxic substances in the incoming water. If it cannot be completely removed, the impact of toxic substances on sludge can be reduced by increasing sludge concentration and improving microbial tolerance.
-Optimize aeration: Adjust the aeration intensity and time reasonably according to the properties and treatment requirements of the sludge to avoid excessive aeration. Appropriate aeration parameters can be determined by observing indicators such as sedimentation performance and dissolved oxygen concentration of sludge.
-Increase sludge discharge: If the sludge ages or proliferates excessively, it may also lead to flocculation. Appropriately increasing the sludge discharge volume and removing aged sludge can help maintain the activity and stability of the sludge system.
-Adding microbial agents: In cases where sludge flocculation is severe, it may be considered to add some microbial agents, such as activated sludge microbial agents, to supplement the number and types of microorganisms in the sludge and improve its treatment capacity.
In addition, it is necessary to strengthen the operation management and monitoring of the sewage treatment system, promptly identify problems, and take corresponding measures for adjustment. At the same time, regular analysis and testing of sludge are conducted to understand its properties and status, providing a basis for solving the problem of sludge flocculation. If the problem is complex or difficult to solve, it is recommended to consult professional sewage treatment technicians.
