Quartz sand filter and air-water backwashing method thereof

Abstract

The invention relates to the field of water treatment devices, and relates to a quartz sand filter and a soda water backwashing method thereof. The interior of the filter layer is sequentially composed of a filter layer, a first supporting layer, a second supporting layer and a third supporting layer; in the quartz sand There is a layer of air intake pipe at the interface between the filter layer inside the filter and the first supporting layer. The air intake pipe is composed of the main air intake pipe and the auxiliary air pipe connected to the main air intake pipe. The main air intake pipe is connected to the quartz sand filter. There is an air inlet on the outer wall of the device, and an air outlet is opened on the auxiliary air pipe; an air inlet valve is arranged on the air inlet pipe. The backwashing method is as follows: (1) Let the air enter the filter layer through the air inlet pipe with a pressure less than 1.5KG / CM2 and an air intake volume of 10-15L / S.M2 to stir the polluted and agglomerated filter layer; at the same time, enter 10 -15M / H flow rate of water to achieve the purpose of steam-water mixing and cleaning; (2) Stop the air intake, and enter the water from the outlet pipe in the support layer at the bottom of the filter cylinder to effectively and thoroughly backwash the quartz sand layer. The backwashing method of the present invention has less backwashing water and short time, avoids the possibility of chaotic layers of arranged sand layers and leakage of fine sand, and can effectively and thoroughly clean the quartz sand layer of the filter.

Description

technical field [0001] The invention relates to the field of water treatment devices, in particular to a quartz sand filter and a steam water backwashing method thereof. Background technique [0002] Quartz sand filter is a pretreatment equipment in the water treatment system, and there is a quartz sand layer inside it, from top to bottom: [0003] Filter layer - quartz sand: 0.4-0.6mm (grain size) 600-800mm (height) [0004] Supporting layer - quartz sand: 0.6-1.2mm (grain size) 200-400mm (height) [0005] Supporting layer - quartz sand: 1.2-2.0mm (grain size) 200mm (height) [0006] Supporting layer - quartz sand: 3.0-5.0mm (grain size) 200mm (height) [0007] The water inlet of the quartz sand filter is located at the top of the filter cylinder, above the filter layer, and the water outlet is located at the bottom of the filter cylinder, within the supporting layer. Quartz sand is used as a filter material, so that impurities such as particles, suspended solids, sludg...

AI Technical Summary

Problems solved by technology

However, during operation, the 0.4-0.6mm quartz sand filter layer is easily polluted and agglomerated by suspended solids, sludge, colloids and other impurities in the water. It needs to be backwashed and washed with a lot of water, and the cleaning time Very long, and even then it's hard to get it back to optimal filtering

[0008] In the prior art, there is also a method of combined cleaning with steam and water. The air enters from the bottom of the quartz sand filter cylinder, but it still cannot effectively clean the polluted and agglomerated quartz sand filter layer (0.4-0.6mm filter material). Agitation (loosening), and because the filter sand layer and the supporting layer are arranged from top to bottom, from fine to coarse, the agitation of the sand layer from the bottom is likely to stir the entire sand layer, resulting in 0.4- The 0.6mm quartz sand filter layer has sand particles sinking, which reduces the filtering effect, and even small sand particles leak into the back-end system, causing irreparable losses

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