Constructed wetland system for efficiently removing nitrate and/or heavy metals in underground water and operation method of constructed wetland system

A constructed wetland system and a technology for constructed wetlands are applied in the field of constructed wetland systems for efficiently removing nitrates and/or heavy metals from groundwater, and can solve problems such as affecting human health, insufficient microbial denitrification and denitrification, and increased organic matter concentration.

Inactive Publication Date: 2020-08-04
NORTHWEST A & F UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Due to the extremely low concentration of organic matter in groundwater, the carbon source that can be supplied is very small, resulting in insufficient microbial denitrification and denitrification, so that the concentration of nitrate nitrogen cannot be reduced through the groundwater system itself.
At present, some studies have used some carbon sources in the groundwater to enhance the microbial denitrification ability, but the amount of carbon sources is often not easy to control and may easily lead to secondary pollution problems such as increased organic matter concentrations.
In addition, with the rapid development of industry in recent years, a large amount of industrial wastewater has been discharged indiscriminately, resulting in higher and higher levels of heavy metals in groundwater in some industrial areas, seriously affecting human health.

Method used

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  • Constructed wetland system for efficiently removing nitrate and/or heavy metals in underground water and operation method of constructed wetland system
  • Constructed wetland system for efficiently removing nitrate and/or heavy metals in underground water and operation method of constructed wetland system
  • Constructed wetland system for efficiently removing nitrate and/or heavy metals in underground water and operation method of constructed wetland system

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preparation example Construction

[0040]In the present invention, the preparation method of the biochar particles preferably includes the following steps: carbonizing agricultural and forestry waste at 500-600° C. for 5-7 hours in a protective atmosphere, washing the obtained carbonized product with hydrochloric acid and drying, Obtain biochar particles. In the present invention, the protective atmosphere is preferably provided by nitrogen; the agricultural and forestry wastes are preferably derived from a large number of common wastes in rural areas, such as one or Several kinds. In the present invention, the agricultural and forestry wastes are preferably washed with water several times to remove surface adherents, air-dried and fully dried in an oven, crushed through a 2cm sieve, and then the resulting biomass particles are placed in a muffle furnace for carbonization; the carbonization The temperature is preferably 550°C, and the time is preferably 6h. After completing the carbonization, the present inve...

Embodiment 1

[0062] A method for preparing biochar particles, comprising the following steps:

[0063] The agricultural wastes (obtained by mixing wood chips, walnut skins and apricot cores by equal mass) were washed with water several times to remove surface adherents, air-dried and fully dried in an oven, crushed through a 2 cm sieve, and then the obtained biomass particles were placed in a horse In a Furnace, carbonization was carried out at 550°C for 6h in a nitrogen atmosphere; -1 hydrochloric acid to remove ash, and then dried to obtain biochar particles.

[0064] According to the field sampling data, using figure 1 The constructed wetland system with the structure shown was tested in a rural area of ​​Shaanxi Province. Specifically, the method of continuous water inflow and push outflow was adopted. The inflow water was groundwater polluted by nitrate and heavy metals chromium (VI) and lead (II). Among them, The concentration of nitrate nitrogen is 20.2mg / L, the concentration of c...

Embodiment 2

[0069] According to the field sampling data, using figure 1 The constructed wetland system with the structure shown was tested in a suburban industrial area in Shaanxi Province. Specifically, the method of continuous water inflow and push outflow was adopted. The inflow water was groundwater polluted by nitrate, and the concentration of nitrate nitrogen was 30mg / L. Organic matter concentration (COD) concentration is 8mg / L; According to the method for embodiment 1, described influent water is purified, and operation 60 days, the effluent index of effluent collection well 16 is: nitrate nitrogen concentration is 1.3mg / L, and ammonia nitrogen and The concentration of nitrite nitrogen is about 0.09mg / L;

[0070] After 40 days of continuous operation, heavy metal chromium (VI) pollution gradually appeared in the influent, with a maximum concentration of 2.1 mg / L. After purification by the constructed wetland system, the effluent index of the effluent collection well 16 was: the con...

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Abstract

The invention provides a constructed wetland system for efficiently removing nitrate and / or heavy metals in underground water and an operation method of the constructed wetland system, and belongs tothe technical field of water purification. The constructed wetland system comprises an underground water well, a submersible pump, a submersible pump water diversion pipe, a constructed wetland, an effluent collecting pipe and an effluent water collecting well; a planting plant, a planting fine sand layer, a surface water distribution system, an iron-carbon functional filler layer, an iron-carbonfunctional micro-aeration system, a flow guide baffle, a gravel layer, a supporting layer and a water outlet aeration system are sequentially arranged in the constructed wetland from top to bottom; awater outlet is formed in the side wall, corresponding to the joint of the supporting layer and the effluent aeration system, of the constructed wetland; the water outlet is communicated with the effluent collecting well through theeffluent collecting pipe; the submersible pump is arranged at the bottom of an underground water well and communicated with the surface water distribution system through the submersible pump water diversion pipe. The constructed wetland system provided by the invention is reasonable in structural design, and nitrate and / or heavy metals in underground water can be efficiently and economically removed.

Description

technical field [0001] The invention relates to the technical field of water body purification, in particular to a constructed wetland system for efficiently removing nitrate and / or heavy metals in groundwater and an operating method thereof. Background technique [0002] More than half of the world's population mainly uses groundwater as a source of drinking water, especially in rural areas where the dependence on groundwater is higher. Although groundwater resources are so important and scarce, groundwater has been seriously polluted in recent years, especially nitrate pollution, which has become a common problem all over the world. Due to the extremely low concentration of organic matter in groundwater, the carbon source that can be supplied is very small, resulting in insufficient microbial denitrification and denitrification, so that the concentration of nitrate nitrogen cannot be reduced through the groundwater system itself. At present, some studies have used some ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F3/34C02F3/30C02F3/12C02F101/16C02F101/20C02F101/22
CPCC02F3/32C02F3/34C02F3/1205C02F3/302C02F2101/163C02F2101/20C02F2101/22C02F2003/003C02F2003/001Y02W10/10
Inventor 吴海明贾利霞李明冯立魁李文董璐赵欣
Owner NORTHWEST A & F UNIV
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