The reasons why the plate and frame filter press mud is not formed may involve many aspects, the following is a detailed analysis of these reasons:
One. Improper sludge conditioning
Lack of sludge conditioner: the sludge is not added before entering the plate and frame filter press, resulting in the sludge is not easy to form stable floc, thus affecting the mud molding. Especially for the biochemical sludge, because the flocs formed by it are easy to deform under the action of external forces, it is easier to lead to the clogging of the filter cloth, and then affect the mud pressing effect.
Insufficient mixing of sludge and conditioner: insufficient mixing time of sludge conditioner and sludge or improper dosing method will lead to uneven mixing, thus affecting the dewatering effect of sludge.
Improper selection of sludge conditioner model: the selection of the wrong sludge conditioner model will cause insufficient rigidity of the formed floc, which is easy to deform under external force, and is also not conducive to mud pressing.
Two, sludge properties
Sludge solid content is too low: the sludge moisture content is too high, the solid content is too low, will directly affect the mud pressing efficiency. Because too much water will dilute the solid particles in the sludge, making it difficult to form a tight filter cake.
Poor water filtration of sludge: poor water filtration and specific resistance of sludge will lead to dehydration difficulties. This may be due to the fact that the sludge contains a large number of hydrophilic groups or impurities, making it difficult to separate water from the sludge.
Rigid floc is too small: if the formed floc is too small, it is similar to the filter cloth aperture, which is easy to cause clogging of the filter cloth, thus affecting the mud pressing effect.
Three, equipment factors
Improper selection of filter cloth: the material, aperture and weaving mode of filter cloth will affect its filtration effect and durability. If the filter cloth is not selected properly, it may lead to poor filtering effect or easy blockage.
Equipment blockage: During the use of the plate and frame filter press, if it is not cleaned and maintained in time, it may lead to equipment blockage, thus affecting the mud press effect.
Insufficient compression force: If the clamping force of the plate and frame filter press is insufficient, it will lead to too large a gap between the filter plates, so that the water in the sludge can not be effectively extruded, thus affecting the mud molding.
Four. Operational factors
Improper operation: The filter press is not used according to the operating procedures, such as the pressing time is too long or too short, and the pressing pressure is insufficient, which will affect the mud pressing effect.
Insufficient pretreatment: Before the sludge enters the filter press, it needs to be pre-treated, such as dehydration, drying, etc. If the pretreatment is insufficient, the moisture content of the sludge will be too high, and it is not easy to form a tight filter cake.
Other factors
Sludge contains impurities: such as soil, slag and other impurities will increase the moisture content of the sludge, thus affecting the mud pressing effect.
Equipment aging: With the increase of use time, the parts of the plate and frame filter press may age or wear, which affects its filtering effect and durability.
In summary, the reasons for the non-forming mud press of plate and frame filter press may involve sludge conditioning, sludge properties, equipment factors, operational factors and many other aspects. In order to solve this problem, it is necessary to start from multiple angles, such as selecting the right type of sludge conditioner, optimizing the sludge pretreatment process, strengthening equipment maintenance and cleaning, and standardizing the operation process.