Artificial wetland capable of strengthening treatment effect of salt-containing wastewater by utilizing intertidal zone bottom mud and application

A technology for artificial wetlands and saline wastewater, applied in water/sludge/sewage treatment, biological water/sewage treatment, biological treatment devices, etc. Promote the application, affect the wetland treatment effect, etc., to achieve the effect of enriching microbial diversity and salt-tolerant populations, good COD removal effect, and improved effluent COD removal rate

Inactive Publication Date: 2018-10-26
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when constructed wetlands are actually applied to the field of treating saline wastewater, wetland plants are often affected by high-load saline wastewater, which leads to stress on their physiological conditions (causing osmotic stress to plants, causing difficulties in root system water absorption, affecting plant root systems to NH 4+ plasma absorption), and ultimately affect the wetland treatment effect
[0003] At present, for the biological treatment of saline wastewater, most of them focus on the adaptability of microorganisms to high-salt stress and try to screen salt-tolerant microbial strains, while there are few studies on the application of salt-tolerant microorganisms to the saline wastewater treatment process. And the salt-tolerant microorganisms used in the application process are mostly single strains screened and purified from the saline environment
This treatment process is often unable to cope with environmental changes and contamination by alien species, so it cannot be applied on a large scale

Method used

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  • Artificial wetland capable of strengthening treatment effect of salt-containing wastewater by utilizing intertidal zone bottom mud and application
  • Artificial wetland capable of strengthening treatment effect of salt-containing wastewater by utilizing intertidal zone bottom mud and application
  • Artificial wetland capable of strengthening treatment effect of salt-containing wastewater by utilizing intertidal zone bottom mud and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Construction of Embodiment 1 Constructed Wetland

[0042] Collect wetland plants Phragmites reed, carefully wash the roots and stems of the plants with tap water, put them in clean water for 2 weeks, and then select plants with normal growth and consistent growth for transplanting; after transplanting, add tap water to dry for 3 days until the substrate is saturated, and change the Cultured with 10% Hoagland nutrient solution. After the plants survived, they were inoculated with the supernatant from the secondary sedimentation tank of the sewage treatment plant and cultured for several weeks until the system became stable, and a constructed wetland was obtained.

Embodiment 2

[0044] The structure of the constructed wetland obtained by the construction method of embodiment 1

[0045] Depend on figure 1 As shown, a constructed wetland that uses intertidal sediment to enhance the treatment effect of saline wastewater includes a water inlet pipeline 1, a wetland main body, and a water outlet pipeline 7. The water inlet pipeline 1 is located above the wetland main body, and the water outlet pipeline 7 is located at Below the main body of the wetland, the main body of the wetland includes wetland plants 2 and a wetland bed; the main body of the wetland is a subsurface artificial wetland, and the wetland plants 1 are planted on the wetland bed; the wetland bed from top to bottom is the first A sand layer 6, an intertidal bottom mud layer 5, and a filter layer; the filter layer is a second sand layer 8, a gravel layer 3, and a coarse sand layer 4 from top to bottom.

[0046] The water inlet pipe 1 is located in the middle of the top of the constructed wet...

Embodiment 3

[0048] Embodiment 3 waste water treatment

[0049] Salt-containing simulated sewage: prepared from sucrose, ammonium sulfate, potassium dihydrogen phosphate, magnesium sulfate, ferrous sulfate, calcium chloride, and tap water. The theoretical influent concentration is COD=180mg / L, NH 4 + -N=45mg / L;

[0050] The salt concentration of the influent is set at four salt concentration gradients of 0, 50, 100, and 150mM / L, and the influent is about 0.8m 3 / d, the hydraulic retention time is 3 days; design 2 groups of wetlands, respectively with plants and sediment (PA+), with plants and no sediment (PA), each group should have at least 3 parallels, and the system should be measured after 3 months of stability The relevant indicators and recorded data are shown in Table 1.

[0051] Table 1 Wastewater treatment effect

[0052]

[0053]

[0054] Summary: From Example 3, it can be seen that under the same salt concentration, the constructed wetland with intertidal bottom mud ha...

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Abstract

The invention relates to an artificial wetland capable of strengthening a treatment effect of salt-containing wastewater by utilizing intertidal zone bottom mud and application and belongs to the field of environmental protection. The artificial wetland comprises a water inlet pipeline, a wetland main body and a water outlet pipeline, wherein the water inlet pipeline is located above the wetland main body; the water outlet pipeline is located below the wetland main body; the wetland main body comprises wetland plants and a wetland bed body; the wetland main body is a subsurface flow type artificial wetland; wetland plants are planted on the wetland bed body; the wetland bed body comprises a first sand layer, an intertidal zone bottom mud layer and a filtering layer in sequence from top tobottom; the filtering layer comprises a second sand layer, a gravel layer and a rough sand layer in sequence from top to bottom. The artificial wetland can cope with changes of the environment and pollution caused by introduced species; compared with the effect of a traditional single microorganism, the artificial wetland has a better COD (Chemical Oxygen Demand) removing effect and abundant microorganism diversity and salt-resisting species groups are guarantees of effect optimization.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to an artificial wetland for enhancing the treatment effect of saline wastewater by using intertidal bottom mud. Background technique [0002] Constructed wetland is a kind of sewage ecological treatment engineering technology developed in recent decades, which combines ecological construction and sewage treatment, which not only purifies sewage effectively, but also strengthens ecological construction. Compared with traditional sewage treatment technology, constructed wetland has the advantages of low operation and management cost, good treatment effect and environmental friendliness, so it is widely used. However, when constructed wetlands are actually applied to the field of treating saline wastewater, wetland plants are often affected by high-load saline wastewater, which leads to stress on their physiological conditions (causing osmotic stress to plants, causing difficulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32
CPCC02F3/32C02F2203/006
Inventor 王倩胡彦彪刘倩曹珍凤徐薇张吉孔强徐飞杜远达赵聪聪
Owner SHANDONG NORMAL UNIV
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