Selecting the right sludge conditioner can effectively solve the problem of high water content of pressed mud (sludge). Too high water content of sludge will not only affect the efficiency of treatment, but also increase the cost of treatment and may have a negative impact on the environment. Sludge conditioner, as a chemical added to the sludge to improve its properties, can change the stability, rheology and moisture content of the sludge, thus making it easier to dehydrate, easier to handle and dispose of.
Selection principle of sludge conditioner
Do not increase the amount of sludge: should try to choose a conditioner that will not increase the amount of sludge, in order to reduce the cost of sludge disposal.
Easy to use: Select a conditioner that is easy to use and can be added without increasing manpower.
Small corrosion: try to choose a small corrosion, non-strong acid strong alkaline conditioner, so as not to cause personnel damage and long-term corrosion of the pipeline.
Good conditioning effect: select the sludge conditioning agent with fast feeding speed, short filtration time, thick and dry mud cake after conditioning.
Do not change the sludge properties: try to choose the conditioner that does not change the sludge properties and organic matter content.
Safety and environmental protection: Choose a sludge conditioner that is safe and environmentally friendly and does not bring load to water and sludge.
Types and functions of sludge conditioners
Sludge conditioner can be organic or inorganic, common are the following:
Inorganic conditioners: such as polymers, silicates, lime, ferric chloride (ferric sulfate or polyferric sulfate), etc. The dosage of inorganic conditioner is large, and the flocs formed are fine but strong. When using vacuum filter and plate and frame filter press to dehydrate sludge, inorganic conditioner can be considered.
Organic conditioner: such as polyacrylamide, etc. When the dosage of organic conditioner is small, the flocs formed by organic conditioner are thick but of low strength, and are more easily broken than those formed by inorganic conditioner. When using centrifugal dewatering machine and belt filter press to dewater sludge, organic conditioner can be considered.
Application effect of sludge conditioner
In practice, the use of sludge conditioner can achieve good results. For example, a factory used a sludge conditioner called SJC-08 in the wastewater treatment process, which successfully reduced the water content of the sludge from the original 83.5% to 60.3%. This not only improves the processing efficiency, but also reduces the processing cost.
Precautions
Difference in sludge properties: Different properties of sludge, the type and dosage of the selected conditioner are also very different. Therefore, when selecting a sludge conditioner, laboratory or field tests need to be carried out according to the specific nature of the sludge to determine the most suitable type, dosage and treatment conditions of the conditioner.
Mixed reaction conditions: After the mixing reaction of sludge and conditioner to form floc, it must not be destroyed again, because once the floc is damaged, it is difficult to restore to the original state. At the same time, the intensity and time of the mixed reaction also need to be controlled within a certain range to achieve a better conditioning effect.
In summary, it is an effective way to solve the problem of high water content of pressed mud to select the sludge conditioner and use it reasonably. In practical application, the most suitable sludge conditioner should be selected according to the characteristics of sludge, treatment requirements and costs.