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.
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[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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