CN-121971894-A - Water filtering method based on light filter material

CN121971894ACN 121971894 ACN121971894 ACN 121971894ACN-121971894-A

Abstract

The invention discloses a water filtering method based on a light filter material, and relates to the technical field of sewage treatment. The filtering device comprises a filtering tank body, a filter plate, a light filter material and an aeration device, wherein the filter plate divides a filtering cavity into an upper space and a lower space, the filter material is filled in the upper space and is of a three-dimensional network columnar structure formed by cross-linking thermoplastic polymer fiber filaments, the density of the filter material is 1g/cm 3 ＜ρ＜1.8g/cm 3 , the porosity is more than 80%, and the filter plate is matched with the aeration device to realize the filtration and flushing switching. The filter bed disclosed by the invention is compact and stable, high in filtering precision, thorough in cleaning, low in energy consumption and high in automation degree, and the filter material is sunk and fluidized during flushing, thereby being suitable for treating various suspended matter-containing water bodies.

Inventors

SHANG YONGCHAO
LU JUN
ZHOU LEI
DU TINGTING
GAO HONGGUI
XIAO MEI
XU JINGJING
Tian Zhaocong

Assignees

欧仁(日照)环保装备有限公司

Dates

Publication Date: 20260505
Application Date: 20260318

Claims (10)

1. A water filtering method based on a light filter material is characterized in that a filtering cavity (4) is arranged in the filtering tank body (1), the filtering cavity (4) is communicated with the water outlet pipe (3), a filter plate (5) is arranged in the filtering cavity (4) and divides the filtering cavity (4) into an upper space and a lower space, a filter hole is formed in the filter plate (5), a filter material (6) is filled in the upper space of the filter plate (5), the filter material (6) is larger than the pore diameter of the filter hole, the filter material (6) is of a three-dimensional network columnar structure formed by cross-linking thermoplastic polymer fiber filaments (601), the length direction of the fiber filaments (601) is consistent with the length direction of the filter material (6), the density ρ of the filter material (6) is 1g/cm 3 ＜ρ＜1.8g/cm 3 , the porosity is more than 80%, and an aeration device is arranged in the lower space of the filter plate (5); the water filtration method comprises the following steps: s1, a filtering stage, namely, after water to be treated flows into a filtering tank body (1) through a water inlet pipe (2), the water flows through a filter plate (5) and a bed layer in a filtering cavity (4) to be filtered, and the filtered water is discharged through a water outlet pipe (3); And S2, a flushing stage, namely stopping water inflow, starting an aeration device, aerating the lower space of the filter plate (5), stirring and flushing the filter plate (5) and the filter material (6) by utilizing the rising of bubbles, and entering the filtering stage of the step S1 again after flushing.
2. A water filtration method based on a lightweight filter material as claimed in claim 1, characterized in that the filter plate (5) is provided with a lifting drive (7) for driving the filter plate (5) to lift in the filter chamber (4).
3. A lightweight filter based water filtration method as claimed in claim 2, comprising the steps of: The filtering stage S1 comprises the steps of lifting a filter plate (5) to a filtering high position through a lifting driving device (7), and enabling the filter plate (5) to support a filter material (6) above to form a bed layer, wherein water to be treated flows into a filtering tank body (1) through a water inlet pipe (2) and then flows through the filter plate (5) and the bed layer in a filtering cavity (4) to be filtered, and the filtered water is discharged through a water outlet pipe (3); and S2, in the flushing stage, water inflow is stopped, the lifting driving device (7) is controlled to lower the filter plate (5) to a flushing low position, the aeration device is started to aerate the space below the filter plate (5), the filter plate (5) and the filter material (6) are stirred and flushed by utilizing the rising of bubbles, and the filtering stage in the step S1 can be performed again after the flushing is completed.
4. A water filtration method based on lightweight filter material as claimed in claim 2, characterized in that the lifting drive means (7) comprise a vertically arranged electric push rod, hydraulic cylinder or ball screw driven by a motor one (8) and connected to the filter plate (5).
5. A water filtration method based on lightweight filter material as claimed in claim 2, characterized in that a sludge discharge device is provided in the filter tank body (1).
6. The lightweight filter-based water filtration method of claim 5, comprising the steps of: The filtering stage S1 comprises the steps of lifting a filter plate (5) to a filtering high position through a lifting driving device (7), and enabling the filter plate (5) to support a filter material (6) above to form a bed layer, wherein water to be treated flows into a filtering tank body (1) through a water inlet pipe (2) and then flows through the filter plate (5) and the bed layer in a filtering cavity (4) to be filtered, and the filtered water is discharged through a water outlet pipe (3); s2, a flushing stage, namely stopping water inflow, controlling a lifting driving device (7) to lower the filter plate (5) to a flushing low position, starting an aeration device to aerate the space below the filter plate (5), stirring and flushing the filter plate (5) and the filter material (6) by utilizing the rising of bubbles, and entering the filtering stage of the step S1 again after flushing is finished; And S3, a mud discharging stage, namely depositing a mud-water mixture generated by flushing into a lower space of the filter plate (5) under the action of gravity, standing to enable the mud-water mixture to be settled, starting a mud discharging device to discharge mud, then lifting the filter plate (5) to a high filtering position again through a lifting driving device (7), starting water inflow to recover filtering, and entering the filtering stage of the step S1 again.
7. The water filtering method based on the lightweight filter material as claimed in claim 5, wherein the sludge discharging device comprises a sludge discharging pipe (1001) and a conveying chain (1002) arranged at the lower space of the filter plate (5), a sludge discharging pump (1003) is arranged on the sludge discharging pipe (1001), a plurality of mud scraping plates (1004) are arranged on the conveying chain (1002) at intervals, a plurality of conveying gears (1005) are meshed on the conveying chain (1002), the conveying gears (1005) are rotatably arranged on the inner wall of the filter tank body (1), and the conveying gears (1005) are driven to rotate by a motor II (1006).
8. The water filtering method based on the lightweight filter material as claimed in claim 1, wherein the aeration device comprises an aeration pipe (1101), aeration holes are distributed on the aeration pipe (1101), and the aeration pipe (1101) is connected with an aeration fan (1102).
9. The water filtering method based on the light filter material according to claim 1, wherein a steady flow baffle plate (12) is arranged in the filter tank body (1) and positioned at the water inlet pipe (2), the top of the steady flow baffle plate (12) is higher than the water level of the filter tank body (1), and a gap exists between the bottom of the steady flow baffle plate (12) and the bottom of the filter tank body (1).
10. A water filtration method based on lightweight filter material as claimed in claim 1, characterized in that the upper part of the filtration chamber (4) is provided with a number of water collection channels (13), the water collection channels (13) being fitted with a filter screen.

Description

Water filtering method based on light filter material Technical Field The invention relates to the technical field of sewage treatment, in particular to a water filtering method based on a light filter material. Background In the field of water treatment, aiming at intermittent incoming water containing suspended solids such as rainfall runoff, industrial batch drainage and the like, solid-liquid separation is a core treatment link, screen filtering and filter material filtering are two types of technical means which are most widely applied at present, wherein a filter device based on the filter material has strong dirt interception capability and wide application range, and becomes a main stream selection of water treatment scenes of the type. In the prior art, the filter material filtering device is mainly divided into two types of fixed bed filters and suspension filter material filters, and both the two types of filter material filters depend on the pore structure of the filter material to realize suspension interception, but are limited by the characteristics of the filter material and the structural design of equipment, have obvious technical defects in actual operation, and are difficult to meet the double requirements of filtering precision, operation stability and backwashing efficiency. The fixed bed filter adopts a light filter material with the equal density of quartz sand being greater than that of water, and a supporting layer is formed by a fixed filter plate and a filter head, so that the filter material forms a dense fixed filter bed. The device has higher filtering precision, can effectively intercept tiny suspended matters, but has outstanding problems in the back flushing link that a large amount of water and air are introduced from the bottom of the filter bed during back flushing, so that the whole filter bed is expanded and fluidized to realize filter material cleaning, the device has the problems of high energy consumption and water consumption, difficult guarantee of back flushing uniformity, easy formation of cleaning dead angles in the filter bed, easy hardening of the filter material after long-term operation, reduction of the porosity and the filtering efficiency of the filter bed, blockage of the filter plate and the filter head by the intercepted suspended matters, and increase of equipment maintenance cost. The suspended filter material filter adopts a filter material with the density smaller than that of water, such as ceramsite, foaming plastic beads and the like, and the filter material does not need to be fixed with a supporting layer and forms a suspended filter bed by stacking by itself, thereby belonging to a moving bed or floating bed structure. The filtering material of the device is easier to fluidize during backwashing, the problem of hardening of the fixed bed filtering material is solved to a certain extent, but the defects of the filtering stage are particularly obvious, the filtering material floats on the upper part of a water body due to small density, the filtering bed structure is loose, the porosity is large, the stability is poor, the disturbance and uneven distribution of a filtering material layer are easily caused by water flow impact, the filtering precision is greatly reduced, the fluctuation of the water quality of effluent is large, meanwhile, the backwashing mode is fixed bottom aeration, the suspended filtering material is stirred from bottom to top by means of air flow, the inherent defects exist in the mode, firstly, the filtering material density is small, the integral stirring can be realized only by needing larger air quantity, the energy consumption is high, secondly, the filtering material and fixed parts such as a pool wall and a bottom aeration structure lack of the filtering material, the cleaning dead angle is easily formed at corners, thirdly, the filtering material is always in static relation with a supporting structure, the cleaning strength is limited, and suspended matters adhered on the surface are difficult to thoroughly strip. In conclusion, the prior art lacks a filtering technical scheme which can ensure that the filter bed is compact and stable to obtain high-precision water outlet during filtering and can realize thorough, uniform and low-consumption fluidization of the filter material during cleaning. Disclosure of Invention The invention aims to solve the technical problems of overcoming the defects of the prior art, providing a water filtering method based on a light filter material, effectively solving the core problems of difficult compromise of ' high energy consumption, unstable operation ', narrow adaptation range ' and the like of the filtering precision and the cleaning efficiency of the prior filter material filtering technology, compromise of efficient filtration and low-consumption cleaning, stable operation and flexible adaptation, and having wide application prospect in the fields of sewage treatment, rainwa