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Aeration biological filter tank and arraying method of aeration filtering head

A biological aerated filter and filter head technology, applied in water aeration, sustainable biological treatment, chemical instruments and methods, etc., can solve the problem of not receiving oxygen supply, uneven distribution of process aeration, filter tank treatment Effects and other issues

Active Publication Date: 2005-11-02
安乐工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when actually operating at such a low air / water ratio, it is difficult to avoid the situation that the process aeration inlet hole in a local area is located below the air / water interface because the civil works cannot usually be built to be completely horizontal. , resulting in an uneven distribution of aeration throughout the process
[0013] Also, since the ineffective filter heads are not evenly distributed across the surface of the biofilter, but instead generate random deviations in the horizontal direction relative to the filter head layer, in many cases will form a flaky "patch", which can Areas of several square meters spread over the surface of the biological aerated filter over which no oxygen supply is received and therefore do not participate in the biodegradation process
This usually has a serious impact on the treatment effect of the filter

Method used

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  • Aeration biological filter tank and arraying method of aeration filtering head
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  • Aeration biological filter tank and arraying method of aeration filtering head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take one volume of water as 10,000m 3 / d of the domestic sewage treatment plant as an example, the post-nitrification treatment process is adopted, the average concentration of ammonia nitrogen in the influent is 10mg / l, and it changes with the peak flow or low flow. The treatment plant contains two sets of upflow biological aerated filters, each with a size of 5m x 3m and a height of 7.2m, filled with expanded clay filter material with a height of 4m, and the distance between the top of the filter material and the top of the tank is 2 Meter. A total of 820 filter heads of the present invention were installed in the filter head layer, among which 270 (33%) were high-flow filter heads and 550 (67%) were base-flow filter heads.

[0041] When the average air-to-water ratio is 1 to 1, if only the same type of filter head is used, the air distribution will not be uniform, but the uniformity of air distribution will be greatly improved by using a 67% base flow filter head s...

Embodiment 2

[0043] Take another water volume as 10,000m 3 / d, the domestic sewage treatment plant with an average influent ammonia nitrogen concentration of 10mg / l is taken as an example. The two-stage upflow biological aerated filter treatment process of pre-denitrification and post-nitrification is adopted, and the effluent of the post-stage nitrification biological filter (containing a large amount Nitrate) will return to the pre-stage denitrification biofilter. In the two-stage biofilter, the front stage will not be aerated while the latter stage will be aerated. Both are equipped with filter heads. The internal reflux of nitrate will lead to an increase in the flow rate of the biofilter, but since the concentration of ammonia nitrogen remains unchanged, the aeration requirements for industrial fabrics remain unchanged. backflow), and this uses a 50% base flow filter head and a 50% high flow filter head to ensure that the air can be evenly distributed.

Embodiment 3

[0045] Take a volume of water as 4000m 3 / d of the domestic sewage treatment plant as an example, in the upflow biological aerated filter with a size of 5 meters x 3 meters and a height of 6 meters, it is filled with an expanded clay filter material with a height of 4 meters, and the top of the filter material and The pool top distance is 2 meters, and 897 filter heads of the present invention are installed in the filter head layer, wherein 299 (33.3%) are high flow filter heads, and 598 (66.7%) are base flow filter heads.

[0046] When BOD volume load is 1.22kg / m 3 d. Ammonia nitrogen volume load is 0.2kg / m 3 d. When the nitrate reflux rate is 180%, and the gas-water ratio is 1:3, when the pre-denitrification and nitrification two-stage biological filter is used, the BOD removal rate reaches 95%, the ammonia nitrogen removal rate reaches 96%, and the total nitrogen removal rate up to 72%.

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Abstract

The present invention relates to sewage treating apparatus, and is especially the arrangement method of aerating biofiltering pond and aerating head with different kinds of filtering head. The filtering heads in the aerating biofiltering pond includes base flow filtering head and high flow filtering head, and the base flow filtering head has aeration inlet hole in the pipe wall in relatively high position compared with that of the high flow filtering head.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to an aerated biological filter tank with different types of filter heads and an arrangement method of the aerated filter heads. Background of the invention [0002] Biological aerated filter (BAF) is widely used in the treatment of municipal sewage or industrial wastewater in the world. It combines high treatment efficiency with many other advantages such as high effluent quality and high reliability. Such as figure 1 As shown, the biological aerated filter mainly includes a filter material, a tank body supporting the filter material, a filter head layer equipped with a filter head for water supply and air supply and supporting the filter material, and a filter layer below the filter head layer for introducing sewage , process aeration, backwash water and backwash air all necessary devices and structures. [0003] The removal of pollutants in BAF is mainly based on two mechanisms, na...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 康拉德胡百利
Owner 安乐工程有限公司
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