CN201288095Y

CN201288095Y - Aerating biological filter with large grain diameter light stuffing on surface layer

Info

Publication number: CN201288095Y
Application number: CNU2008202191107U
Authority: CN
Inventors: 李兴也
Original assignee: DALIAN HENGJI XINRUN WATER WORKS Co Ltd
Current assignee: DALIAN HENGJI XINRUN WATER WORKS Co Ltd
Priority date: 2008-11-12
Filing date: 2008-11-12
Publication date: 2009-08-12
Anticipated expiration: 2018-11-12

Abstract

The utility model disclosed an aeration biological filter of a light filling material whose surface layer has big granule diameter, and the filtering device thereof is provided with a bearing layer (1) and a material filtering layer (2), which are arranged from bottom to top. The aeration biological filter is characterized in that a big granule diameter light filling material layer (3) is arranged on the upper portion of the material filtering layer (2). The filtering materials with different granule diameter are used in the aeration biological filter of the utility mode, the filtering materials with bigger granule diameter are used in the bearing layer, the filtering materials with smaller diameter are used in a middle layer, a layer of light filtering materials with bigger diameter is added on the surface layer. The light filtering materials with bigger diameter on the surface layer play the pre-treating function, enable the layer to be used for the biological treatment and containing an amount of SS, greatly reduce the accumulation speed of the SS quantity of the filtering materials in the middle layer, prolong the time that the flow quantity reaches to the critical value, thereby prolonging the backwash period of the biological filter, improving the efficiency, saving the backwash water consumption, and reducing the operation cost, and the corresponding position of the structural layer of the filter after the backwash is unchanged, the water outlet is stable, and the quality is higher.

Description

Biological aerated filter with large particle-size and light-weight filler at surface layer

Technical field:

The utility model relates under a kind of sewage to stream BAF, especially a kind of BAF with three layer filtration thing.

Background technology:

Microorganism cells almost can adhere to by any suitable carrier surface in water surrounding securely, and grows thereon and breed, and makes microorganism cells form fibrous tangled structure by polymer outside the born of the same parents that stretch to the extracellular in the cell, just is referred to as microbial film.Particulate matter in the BAF water inlet is trapped within surface, filter tank and the filler space, and the excessive microorganism that grows also accumulates in surface, filter tank and the filler space, and along with the continuous service for the treatment of processes, SS increase, voidage reduce in the filler.Reach or during near design discharge, total head loss meeting is near by the necessary head of BAF or particle penetration occurs, these two kinds may situations before any occurs, BAF should be cleaned immediately.

Existing BAF operation was usually washed once in one day, and the back flushing water yield is the 3-5% of amount of inlet water, carried out smoothly to guarantee to filter.But frequent flushing can make microbial film seriously come off, and causes biomass minimizing in the packing layer, so that influences treatment effect, and easily cause breakage, the loss of filler and increase unnecessary back flushing water loss, current consumption.

Summary of the invention:

The utility model provides a kind of backwashing period that can prolong the biological filter at the above-mentioned deficiency of prior art, raises the efficiency, and reduces running cost, optimizes the biological aerated filter with large particle-size and light-weight filler at surface layer of water outlet.

Technical solution of the present utility model is: a kind of biological aerated filter with large particle-size and light-weight filler at surface layer, its filtration unit is placed with supporting layer, filter material layer from bottom to top, is provided with the large particle-size and light-weight filler layer on filter material layer top.

Described large particle-size and light-weight filler layer is to be volcanics or hard coal or the artificial haydite of 6～8mm or to constitute any mixing of above-mentioned materials that by particle diameter its thickness is 800～1200mm, preferred 1000mm.

Described filter material layer is to be that the quartz sand of 4～5mm constitutes by particle diameter, and its thickness is 1800～2200mm, preferred 2000mm.

Described supporting layer is to be made of big particle diameter material, and its thickness is 600～1000mm, preferred 800mm.

With the filtrate of different-grain diameter, with the bigger filtrate of particle diameter, the middle level increases the bigger light filter material of one deck particle diameter with the less filtrate of particle diameter, top layer in supporting layer the BAF of the present utility model.The light filter material that the top layer particle diameter is bigger plays the pre-treatment effect, this one deck not only can be carried out a biological disposal upon, and can take a large amount of SS in, slowed down the accumulating rate of middle level filtrate SS amount greatly, prolonged flow and arrived the time of threshold value, so also prolonged the backwashing period of biological filter, raised the efficiency, save backwash water, reduce running cost; And filter tank structural sheet relative position is constant after the back flushing, stable water outlet, and quality is higher.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Specific embodiment:

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

As shown in Figure 1, a kind of biological aerated filter with large particle-size and light-weight filler at surface layer, its filtration unit are placed with the supporting layer 1 of the big particle diameter of 800mm from bottom to top, and 2000mm filter material layer 2 is provided with 1000mm large particle-size and light-weight filler layer 3 on filter material layer 2 tops.Large particle-size and light-weight filler layer 3 is to be volcanics or hard coal or the artificial haydite of 6～8mm or to be constituted any mixing of above-mentioned materials by particle diameter.Filter material layer 2 is to be that the quartz sand of 4～5mm constitutes by particle diameter.

Claims

1, a kind of biological aerated filter with large particle-size and light-weight filler at surface layer, its filtration unit are placed with supporting layer (1), filter material layer (2) from bottom to top, it is characterized in that: be provided with large particle-size and light-weight filler layer (3) on filter material layer (2) top.

2, biological aerated filter with large particle-size and light-weight filler at surface layer according to claim 1; it is characterized in that: described large particle-size and light-weight filler layer (3) is to be volcanics or hard coal or the artificial haydite of 6～8mm or to be constituted any mixing of above-mentioned materials by particle diameter; its thickness is 800～1200mm, preferred 1000mm.

3, biological aerated filter with large particle-size and light-weight filler at surface layer according to claim 1 is characterized in that: described filter material layer (2) is to be that the quartz sand of 4～5mm constitutes by particle diameter, and its thickness is 1800～2200mm, preferred 2000mm.

4, biological aerated filter with large particle-size and light-weight filler at surface layer according to claim 1 is characterized in that: described supporting layer (1) is to be made of big particle diameter material, and its thickness is 600～1000mm, preferred 800mm.