Integrated lightweight filter-material water treatment filter tank

Abstract

An integrated lightweight filter-material water treatment filter tank is characterized by comprising at least a water treatment unit. The water treatment unit comprises a tank. The tank is composed of a clear water area, a filtering area and a water inlet area which are communicated with each other through water-flow from the top to the bottom. Adjacent two areas of the above three areas are isolated through a filter board respectively. The filter board is provided with several water channels used for water flowing. The water inlet area has a water inlet used for receiving sewage to be filtrated. The filtering area holds several lightweight elastic filter material particles which have lower density than water. Particle size of the lightweight elastic filter material particles is greater than width of the water channels. After water-flowing, each lightweight elastic filter material particle forms a filter layer, and there is a gap between the filter layer and the lower filter board. The top of the clear water area is an overflow surface of clear water. The filter tank has advantages of good filtering effect, low backwashing requirement, high reliability, low cost, low operation cost, less land occupation and convenience in operation management.

Description

technical field [0001] The invention relates to the field of environmental water treatment, in particular to an integrated water treatment filter using light filter material, which is used for treating sewage after physical and chemical treatment. Background technique [0002] Filters are an indispensable and important link in the field of water purification (such as waterworks), and generally use quartz sand filter media for water treatment filters. It can also be used in the treatment of industrial water, industrial wastewater and domestic sewage. [0003] Its structure and operating principle of this existing quartz sand filter tank are as follows: [0004] The filter uses quartz sand filter material as the filter medium. The particle size of the filter material is usually 0.5~1.2mm, the specific gravity is 2.5, and the thickness of the filter layer is ~700mm. A support layer composed of small to large coarse sand to prevent the loss of the quartz sand filter material. ...

AI Technical Summary

Problems solved by technology

[0008] 1. Quartz sand filter particles are rigid filter materials. After backwashing, the filter materials with small particle diameters will be distributed in the upper part of the filter layer, and the filter materials with large particle diameters will be distributed in the lower part of the filter layer.

The upper part of the filter material layer will form a filter membrane due to the interception of fine suspended matter and colloidal matter, which can improve the filtration effect, but when the intercepted matter is too much, it will increase the resistance of the filter and reduce the water flow. Backwashing, if not backwashing in time, partial penetration of the filter layer will occur and affect the quality of the effluent

[0009] However, the primary filtration water after backwashing has not yet formed the filter membrane, and the water quality is usually poor, so it needs to be refluxed;

[0010] 2. The strength requirement of backwashing is high (~45m 3 / m 2 h), the backwash time is long (6~8 minutes / time), so the consumption of backwash water is large, and the power requirement of the backwash water pump is also high;

[0011] 3. The backwash water comes from the clean water pool. The water in the clean water pool is pumped into the bottom of the filter tank through the backwash pump, and backwashed from bottom to top. A large amount of backwash water will be discharged in a few minutes. Rivers, so facilities must be added to intercept pollutants before they are allowed to be discharged into nearby rivers, which requires a lot of investment costs

[0014] 2. The control index of discharge standard water quality is relatively low, which is generally considered unnecessary;

[0015] 3. The investment of the quartz sand filter is large, the operating cost is high, and the operation and management are troublesome;

[0016] 4. Environmental discharge requirements are gradually raised, and the rapid development of industry has caused some industrial wastewater to be discharged into domestic sewage treatment plants. The original treatment process is difficult to withstand different impact loads, making COD (chemical oxygen demand), TN (total nitrogen) , TP (Total Phosphorus) Exceeding the Standard Discharge Occurs from Time to Time

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