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Denitrified sewage treatment device and treatment method for artificial wetland

A technology of sewage treatment device and constructed wetland, applied in biological water/sewage treatment, water/sludge/sewage treatment, anaerobic digestion treatment, etc., can solve the problems of high cost of carbon source addition, high cost of addition, fluctuation, etc. , to meet the effluent quality requirements, solve the problem of ineffective control, and achieve the effect of reasonable resource utilization

Active Publication Date: 2015-01-21
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heterotrophic denitrification is the use of organic matter such as methanol and acetic acid as carbon sources by heterotrophic denitrifying bacteria to convert NO x Reduction to nitrogen, while generating alkalinity, requires the consumption of H + , but it has the problems of high cost of carbon source addition and residual carbon source in the effluent water quality; the sulfur limestone denitrification system in autotrophic denitrification is a good choice for removing NO due to its economy and good effluent water quality. x A common method in which sulfur denitrifying bacteria use elemental sulfur to convert NO x Reduction to nitrogen gas, while producing H + , needs to consume alkalinity (limestone), but there are problems of effluent hardness and sulfate radical increase; therefore, combining the two, the researchers developed a heterotrophic-sulfoautotrophic polytrophic denitrification process to remove nitrate in sewage , between the two can play a role in mutual adjustment of pH value, can avoid the addition of alkalinity (limestone) and reduce the generation of sulfate radicals, and at the same time, the proportion of heterotrophic and sulfur autotrophic denitrification can be adjusted according to the supply of carbon sources. Fluctuates within the range, favoring NO x effective removal of
[0005] In order to strengthen the denitrification of sewage with low C / N ratio, external carbon sources are mostly adopted. There are three types of carbon sources. One is traditional liquid carbon sources such as methanol and acetic acid, but there is a disadvantage of high cost of addition; the other is that it can be biodegradable. The polymer carbon source also has the disadvantage of high cost; the third is the natural plant carbon source containing cellulose, which is gradually used as a carbon source for strengthening denitrification because of its cheapness, easy availability, and simple operation, but its carbon source release cannot Effective control requires a long hydraulic retention time (HRT), and the effluent water quality is easily affected by the external temperature. When the plant carbon source is released more, the effluent water quality is easily affected by the carbon source released by the residual plant
[0006] In the heterotrophic-sulfoautotrophic polytrophic denitrification process, the carbon sources supplied by heterotrophic denitrification are mostly traditional liquid carbon sources such as methanol and acetic acid, and there is no plant carbon source heterotrophic-sulfoautotrophic polytrophic denitrification process Ratio NO x Report on Low C / N Ratio Sewage

Method used

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  • Denitrified sewage treatment device and treatment method for artificial wetland
  • Denitrified sewage treatment device and treatment method for artificial wetland
  • Denitrified sewage treatment device and treatment method for artificial wetland

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a constructed wetland denitrification sewage treatment device includes a sewage treatment pool, and the sewage treatment pool includes a denitrification layer 3 and a soil layer 4; the soil layer 4 is located above or below the denitrification layer 3; the sewage treatment pool The length is ≥1m, and the aspect ratio is ≥3; the two ends of the sewage treatment tank are respectively provided with a water inlet and a water outlet; plants are planted on the soil layer 4; the denitrification layer 3 is composed of sulfur particles, plant stem and leaf fragments and gravel composition.

Embodiment 2

[0034] Such as figure 1 As shown, the difference from Example 1 is:

[0035] Wherein the soil layer 4 is located above the denitrification layer 3; the sewage treatment tank also includes a lower filler layer 2, and the lower filler layer 2 is located below the denitrification layer; the water inlet is located at the front end of the sewage treatment tank The upper part, the water outlet is located at the lower part of the end of the sewage treatment pool, the front end of the sewage treatment pool is provided with a water distribution area 1, and the end is provided with a water collection area 5; the water distribution area 1 and the water collection area 5 are both Accounting for 1 / 15 to 1 / 10 of the total length of the sewage treatment pool, the water distribution area 1 and the water collection area 5 are both filled with crushed stones with a particle size of 20 to 30 mm; the height of the lower packing layer 2 is The height of the denitrification layer 3 is 20-30cm, an...

Embodiment 3

[0038] Such as figure 2 As shown, the difference between this embodiment and embodiment 2 is that

[0039] The plant carbon source heterotrophic-sulfur autotrophic denitrification filler layer is made of 1-2cm plant stem and leaf fragments and gravel with a particle size of 3-5mm, and then mixed with sulfur particles with a particle size of 3-5mm along the push flow direction It is filled alternately at equal intervals, and the interval is 10 cm; the mixing of the 1-2 cm plant stem and leaf fragments and the gravel with a particle size of 3-5 mm is uniformly mixed according to the volume ratio of 1:1-4:1.

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Abstract

The invention discloses a denitrified sewage treatment device for an artificial wetland. The device comprises a sewage treatment pond. The sewage treatment pond comprises a denitrification layer (3) and a soil layer (4), wherein the soil layer (4) is arranged above or below the denitrification layer (3); the length of the sewage treatment pond is greater than or equal to 1m and the length-width ratio is greater than or equal to 3; the sewage treatment pond is provided with a water inlet and a water outlet; plants are planted on the soil layer (4); and the denitrification layer (3) consists of sulfur particles, plant stem and leaf fragments and gravels. The invention further discloses a denitrified sewage treatment method. The denitrified sewage treatment device disclosed by the invention has the advantages of low cost and good denitrification effect of sewage.

Description

technical field [0001] The invention relates to a sewage treatment experimental device and a sewage treatment method, in particular to a constructed wetland denitrification sewage treatment device and a sewage treatment method. Background technique [0002] Nitrogen pollution is one of the main problems of surface water pollution. Wastewater with a high proportion of NOx and low C / N ratio, such as tail water from urban sewage plants and farmland receding water, is one of the main sources of nitrogen pollution in surface and groundwater bodies, which urgently needs to be treated. , to prevent water pollution and eutrophication, but also conducive to the reuse of the above-mentioned types of sewage. [0003] High proportion of NO x Sewage with low C / N ratio has the characteristics of large fluctuations in water quality and quantity, and high proportion of nitrite nitrogen and nitrite nitrogen. Due to the lack of organic carbon sources in this type of sewage, the effective rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/28
CPCC02F3/28C02F3/32C02F3/325C02F2101/16C02F2101/163C02F2101/166Y02W10/10
Inventor 王海燕储昭升周岳溪叶碧碧杭前宇苑泉常洋
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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