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Method for improving denitrogenation efficiency of earthworm ecological filter tank

An ecological filter, denitrification efficiency technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of total nitrogen removal rate energy consumption and low construction cost , to achieve the effect of low energy consumption and construction cost, improved removal rate, and high total nitrogen removal rate

Inactive Publication Date: 2011-11-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to improve the nitrogen removal rate of the system by changing the water distribution method and without affecting other water quality indicators, and provide a reasonable It is a sewage treatment method with good treatment effect, high total nitrogen removal rate, low energy consumption and construction cost

Method used

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  • Method for improving denitrogenation efficiency of earthworm ecological filter tank
  • Method for improving denitrogenation efficiency of earthworm ecological filter tank
  • Method for improving denitrogenation efficiency of earthworm ecological filter tank

Examples

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Embodiment 1

[0019] Example 1: Nitrogen removal effect on domestic sewage in a dormitory of Nanjing University

[0020] The size of the buffer pool is 4 meters long, 2.5 meters wide, the total depth is 1.5 meters, and the effective depth is 1.2 meters. It is made of PVC material. Construct four identical earthworm ecological filters made of PVC, wherein the structure is as follows figure 1 shown. The filter body is cylindrical, with a total height of 1.2m, a diameter of 1.20m, a filter material layer height of 1.1m, 45cm soil (earthworm density 12.5g / L soil), 35cm yellow sand, 20cm bluestone and 10cm pebbles from top to bottom; The aperture of the water distribution pipe of the type water distributor is 2mm, and the aperture of the lower water distribution pipe is 1mm. The four earthworm ecological filters are treated separately, and the operation conditions of the four are the same: pre-aeration for 10 minutes before each water intake, and when the hydraulic load is 0.6m 3 / (m 2 Under...

Embodiment 2

[0024] Example 2: Nitrogen removal effect on wastewater from a farm

[0025] The size of the buffer pool is 5 meters long, 3 meters wide, with a total depth of 1.8 meters and an effective depth of 1.5 meters, with a brick-concrete structure. The earthworm ecological filter is also a cube with a brick-concrete structure, the total height is 1.5m, the length and width of the filter are 1.2m and 0.8m respectively, the height of the filter layer is 1.3m, and the soil is 50cm from top to bottom (earthworm density 12g / L soil) , 40cm yellow sand, 30cm bluestone and 10cm pebbles; the apertures of the water distribution pipe and the lower water distribution pipe of the rotary water distributor are 2mm and 1mm respectively. The wastewater from the farm flows to the septic tank through the pipeline, and the supernatant of the septic tank enters the buffer tank for adjustment and mixing. The operating conditions of the earthworm ecological filter: the first kind of pre-aeration for 1h, h...

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Abstract

The invention discloses a method for improving denitrogenation efficiency of an earthworm ecological filter tank. The method is characterized in that: sewage is subjected to solid-liquid separation; the separated sewage is aerates through an aerator; then the resulting sewage is distributed into an earthworm ecological filter tank through a distributor, wherein the earthworm ecological filter tank sequentially comprises a cobble layer, a bluestone layer, a yellow sand layer and a soil layer containing earthworms from the bottom to the top, and adopts a alternation way of drying and wetting to carry out sewage removing treatment. The sewage is distributed into the earthworm ecological filter tank in two times in one water distribution period, wherein the first water distribution is provided for distributing the sewage into the earthworm ecological filter tank, and the second water distribution is provided for distributing the sewage from the position between the soil layer and the yellow sand layer and / or the position between the yellow sand layer and the bluestone layer into the earthworm ecological filter tank. According to the method provided by the present invention, the denitrogenation effect of the single earthworm ecological filter tank on the premise of no influence on other water quality indicators is substantially improved, the nitrogen removing rate of the system is raised. In addition, the method provided by the present invention has characteristics of reasonable water distribution, good treatment effect, high total nitrogen removing rate, low energy consuming and low construction cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for improving the denitrification efficiency of an earthworm ecological filter. Background technique [0002] With the rapid development of economy and society, a large amount of uncontrolled sewage is directly or indirectly discharged into water bodies, which greatly exceeds the environmental capacity and makes pollution more and more serious. The influx of nitrogen causes eutrophication of rivers, lakes and other water bodies. , algal blooms, so it is imminent to reduce the pressure of nitrogen pollution and eutrophication. The earthworm ecological filter is a sewage treatment system that strengthens ecological technology. It uses earthworms to move up and down during the foraging process. The loose filter material enhances the permeability of the filter layer, which is beneficial to the degradation of organic matter. Earthworms use the bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 郑正汪龙眠罗兴章梁越敢郭飞宏郑宾国张继彪王曦曦王家齐李军状
Owner NANJING UNIV