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Kunshan Pinhong EPT Co.,Ltd
Kunshan Pinhong EPT Co.,Ltd
Add : (Qiandeng Yuanchuang Base) No. 125, Jinxing South Road, Qiandeng Town, Kunshan, Jiangsu, China
Tel : （0086）15995617314
Fax : +86-512-50130524
E-mail :lvfang@ksphxs.com
15. What are the main factors affecting the coagulation effect?
The main factors affecting the coagulation effect: water temperature, PH value and alkalinity of water, concentration of suspended solids in water and hydraulic conditions.
16. How many types of precipitation are there? What are they?
There are four types of precipitation, they are:
Free sedimentation: The particles are in a discrete state during the sedimentation process, and their shape, size, and quality do not change, and the sinking speed is not disturbed, and the sedimentation process is completed independently.
Turbulent coagulation sedimentation: During the sedimentation process, the particle size, mass and settling speed all increase with the increase of depth.
Crowded sedimentation: The concentration of particles in the water is relatively large, and they interfere with each other during the sinking process, forming an obvious interface between clear water and muddy water, and gradually moving downward.
Compression sedimentation: The concentration of particles in water is very high. During the sedimentation process, the particles contact each other and are mostly supported by the compressed objects, and the gaps of the lower particles are squeezed out.
17. According to the direction of water flow in the pool, what types of sedimentation tanks can be divided into?
According to the different flow directions in the tank, the sedimentation tank can be divided into flat flow type, obli。que flow type, radial flow type and vertical flow type.
18. What is the law of the distribution of impurities in the filter material layer?
The distribution of impurities in the filter material layer: At the beginning of filtration, the filter material is relatively clean, the pores are also large, the shear force of the water flow is small, and the adhesion is strong. At this time, the particles in the water are first intercepted by the surface filter material. As the filtration time prolongs, the impurities in the filter layer increase and the porosity gradually decreases. Especially for the fine filter material on the surface, the shear force of the water flow increases and the shedding effect increases. Finally, the adhered particles first fall off and move to the lower layer and are filtered by the lower layer. Material retention.
The result is: under a certain filtration head, the filtration rate will decrease sharply, or the loss of the head reaches the limit value under a certain filtration rate, or when the mud film is cracked due to uneven stress on the surface of the filter layer, a large amount of The water flows out from the cracks, causing impurity particles in the water to penetrate the filter layer and deteriorating the quality of the effluent.
19. What are the ways to improve the filtration efficiency?
Ways to improve filtration efficiency: In order to change this situation and increase the dirt-holding capacity of the filter layer, "reverse particle size" filter appears, that is, along the direction of water flow, the particle size of the wave material changes from large to small due to upward flow and two-way flow filter Complex structure, inconvenient flushing and other reasons.
20. What is the composition of the homogeneous filter material?
Composition of homogeneous filter material: Homogeneous filter material refers to any cross-section in the depth direction of the entire filter layer, and the composition and average particle size of the filter material are uniform, but not exactly the same particle size.
21. What is negative head phenomenon? What are the ways to avoid it?
Negative head phenomenon: During the filtration process, when the filter layer retains a large amount of impurities, so that the head loss at a certain depth below the sand surface exceeds the water depth at that point.
The way to avoid negative water head is to increase the water depth on the sand surface, or the water level of the filter tank is dry or the surface of the high-dry filter layer. This is the reason why the siphon pool and the valveless filter tank do not have angular head.
22. How many kinds of backwash water supply methods are there for ordinary fast filters?
There are two ways to supply backwash water for ordinary fast filters: flushing water pumps and water towers.