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Method for purifying domestic sewage with low carbon-nitrogen ratio by biological fermentation coupling artificial wetland system

A constructed wetland system and a technology for constructed wetlands, which are applied in the field of biological fermentation coupled with constructed wetland systems to purify domestic sewage with a low carbon-nitrogen ratio, can solve the problems of waste of resources and energy, poor nitrogen removal effect, and increase the cost of sewage treatment. The effect of improving nitrogen efficiency and saving floor space

Active Publication Date: 2017-11-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used method is to add organic matter such as methanol and ethanol to sewage, which will greatly increase the cost of sewage treatment and cause huge waste of resources and energy.
[0004] Chinese patent 201410170207.3 discloses a method and system for denitrifying low-carbon and high-nitrogen sewage by using plant carbon sources to strengthen constructed wetlands. The supplementary organic carbon sources are mainly plant materials soaked in soaking liquid and hydrolyzed to obtain hydrolyzate. The disadvantage is that it is only simple Adding organic carbon sources, the effect of nitrogen removal is not good

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  • Method for purifying domestic sewage with low carbon-nitrogen ratio by biological fermentation coupling artificial wetland system
  • Method for purifying domestic sewage with low carbon-nitrogen ratio by biological fermentation coupling artificial wetland system
  • Method for purifying domestic sewage with low carbon-nitrogen ratio by biological fermentation coupling artificial wetland system

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Embodiment 1

[0046] A method for purifying domestic sewage with a low carbon-to-nitrogen ratio by a biological fermentation coupled artificial wetland system, comprising the following steps:

[0047] Such as figure 1 As shown, this embodiment is a constructed wetland coupled microbial fermentation system formed in series by a biological fermenter 3 and a surface flow artificial wetland treatment system. The biological fermenter 3 is equipped with straw and composite bacterial agents, the fermenter is sealed, and the fermenter The air treatment system 4 is used to control the gas exchange of the fermentation tank, and the flow meter 9 adjusts the flow of the fermentation liquid to make the sewage mixed to achieve a reasonable carbon-nitrogen ratio. The flow meter 9 is connected to the surface flow constructed wetland treatment system through the outlet pipe 2. The constructed wetland treatment system is set up as a rectangle, and its matrix layer is all a mixture 6 of pastoral soil and yell...

Embodiment 2

[0056] Such as figure 2 As shown, this example is an integrated biological fermentation coupling artificial wetland system in which the biological fermentation tank 3 and the horizontal subsurface flow wetland treatment system are connected in series. In this system, the biological fermentation tank is immersed in the sewage mixing tank 11, which greatly saves the system. It occupies a small area and is conducive to maintaining a constant temperature in the fermenter. The biological fermentation tank 3 is equipped with straw and compound bacterial agent, the fermentation tank is sealed, the air treatment system 4 of the fermentation tank is used to control the gas exchange of the fermentation tank, and the flow meter 9 is used to adjust the flow rate of the fermentation liquid so that the sewage is mixed to achieve a reasonable carbon-nitrogen ratio. The lower part of the matrix layer of the horizontal subsurface flow constructed wetland treatment system is filled with a gra...

Embodiment 3

[0065] Such as image 3 As shown, in this embodiment, the biological fermentation tank 3 is connected in parallel with the vertical subsurface flow constructed wetland treatment system to form a constructed wetland coupled microbial fermentation system. The biological fermentation tank 3 is equipped with straw and compound bacterial agent, the fermentation tank is sealed, the air treatment system 4 of the fermentation tank is used to control the gas exchange of the fermentation tank, and the flow meter 9 is used to adjust the flow rate of the fermentation liquid so that the sewage is mixed to achieve a reasonable carbon-nitrogen ratio. The lower part of the matrix layer of the vertical subsurface flow constructed wetland treatment system is filled with gravel 8 with a thickness of 90 cm to 100 cm, and the upper part is covered with pastoral soil layer 7 with a thickness of about 15 cm to 25 cm. The microbial fermenter 3 is buried at about 30 cm.

[0066] When the system is r...

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Abstract

The invention discloses a method for purifying low-carbon-nitrogen-ratio domestic sewage by a biological fermentation coupling artificial wetland system. The system consists of a microbial fermentation system and a wetland unit which are connected in series. The method comprises the following steps: fermenting straws by adopting microorganisms to obtain a microbial fermentation broth; then adding the microbial fermentation broth into the artificial wetland; mixing the microbial fermentation broth with domestic sewage to obtain a mixed solution, and treating the mixed solution by using the artificial wetland to obtain purified domestic sewage. According to the method, the straws are fermented, so that the straws are reasonably utilized; the resource utilization rate is increased; the carbon source release capacity is high; the carbon-nitrogen ratio of the sewage is effectively improved; and the sewage treatment efficiency is improved.

Description

technical field [0001] The invention belongs to the field of sewage purification, and in particular relates to a method for purifying domestic sewage with a low carbon-to-nitrogen ratio by a biological fermentation coupling artificial wetland system. Background technique [0002] Constructed wetlands refer to wetlands that are artificially designed and constructed according to people's specific needs by simulating the structure and function of natural wetlands. The constructed wetland treatment system can be divided into: surface flow constructed wetland treatment system, horizontal subsurface flow constructed wetland treatment system and vertical subsurface flow constructed wetland treatment system. Its mechanism of action includes adsorption, retention, filtration, redox, precipitation, microbial decomposition, transformation and the action of various animals and plants. Constructed wetlands have the advantages of high pollutant removal efficiency, low investment, operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/32
CPCC02F3/28C02F3/327C02F2209/08C02F2209/16Y02W10/10
Inventor 张建杨忠臣张成禄谢慧君冯素萍王倩
Owner SHANDONG UNIV
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