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Technology for lakeside matrix to strengthen nitrogen and phosphorus removal

A technology for denitrification and phosphorus removal, lakeside belt, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc. The effect of strengthening hydraulic transmission and improving physical and chemical properties

Inactive Publication Date: 2019-04-16
BEIJING FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vegetation filter belt is to use the absorption and enrichment of nitrogen and phosphorus by plant growth to strengthen the removal of nitrogen and phosphorus, but this method takes a long time, and the plants also need to be harvested regularly; human intervention is to remove the sediment mechanically and add lime regularly Denitrification and the use of chemical precipitation to remove phosphorus-containing pollutants are relatively common methods. Although these measures are effective, they will destroy the original ecosystem and can only achieve short-term nitrogen and phosphorus removal effects.

Method used

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  • Technology for lakeside matrix to strengthen nitrogen and phosphorus removal
  • Technology for lakeside matrix to strengthen nitrogen and phosphorus removal
  • Technology for lakeside matrix to strengthen nitrogen and phosphorus removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: biochar: dry reed stalk: the dry mass ratio of the lakeside zone substrate is 3:1:96, planting 15 reeds / m 2 .

[0038] Wash the reed stalks, dry them at 80°C for 24 hours, and then crush them into reed powder to obtain reed powder with a particle size of 0.2-0.5mm. Under protection, after pyrolysis at high temperature for 1 hour, cool to room temperature, rinse with distilled water for 2-3 times to remove surface impurities, and dry at 80°C for 24 hours to obtain biochar; wash reed stalks and dry at 80°C for 24 hours, Cut into small sections of 5 cm; take the dry mass percentage of biochar:dried reed stalk:lakeside zone matrix as 3:1:96 after drying at 80°C for 24 hours, weigh the corresponding quality of biochar and dry reed stalk, and directly Add and mix on the substrate of the lakeside zone, the thickness of the conditioning substrate is 20cm of the substrate of the lakeside zone; then plant 15 reeds / m in the form of rhizomes on the mixed substrate 2...

Embodiment 2

[0040] Embodiment 2: biochar: dry reed stalk: lakeside zone substrate dry mass ratio is 4:1:95, plant cattail and cattail grass, mixed planting density 18 plants / m 2 .

[0041] Wash the reed stalks, dry them at 80°C for 24 hours, and then crush them into reed powder to obtain reed powder with a particle size of 0.4-0.6mm. Under protection, after pyrolysis at high temperature for 1.5h, cool to room temperature, rinse with distilled water 2-3 times to remove surface impurities, dry at 83°C for 24h to obtain biochar; wash reed stalks, and dry at 85°C for 24h , cut into small sections of 10cm; take the mass of the corresponding biochar and dry reed stalks as the percentage of dry mass after drying at 85°C for 24h: biochar:dry reed stalks:lakeside zone matrix at 4:1:95, and directly Add and mix on the lakeside substrate, and adjust the substrate thickness to 30cm of the lakeside substrate; then plant cattails and cattails in the form of rhizomes on the mixed substrate, and the mix...

Embodiment 3

[0043] Embodiment 3: biochar: dry reed stalk: lakeside zone substrate dry mass ratio is 5:2:93, plant calamus and reed, mixed planting density 15 plants / m 2 .

[0044] Wash the reed stalks, dry them at 80°C for 24 hours, and then crush them into reed powder to obtain reed powder with a particle size of 0.3-0.7mm. Under protection, after pyrolysis at high temperature for 1.5 h, cool to room temperature, rinse with distilled water 2-3 times to remove surface impurities, and dry at 82° C. for 24 h to obtain biochar. Wash the reed stalks, dry them at 84°C for 24 hours, and cut them into 8cm pieces. Weigh the corresponding biochar and dry reed stalks based on the percentage of dry mass after drying at 83°C for 24 hours: biochar:dried reed stalks: lakeside substrate: 5:2:93, and add them directly to the lakeside substrate Mix, condition the substrate thickness to 30cm of lakeside substrate. Then plant calamus and reeds in the form of rhizomes on the mixed substrate, and the mixed...

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Abstract

The invention relates to a technology for conditioning a lakeside matrix through biochar and dry reed stems conditioning to strengthen nitrogen and phosphorus removal. The dry mass percent of the charcoal, the dry reed high-temperature cracking stems and the lakeside matrix is (1-5):(0.5-2):(93-98.5). The dry reed stems are subjected to high-temperature cracking to prepare the charcoal, then the charcoal and the dry reed stems are mixed into the lakeside matrix, vascular bundle type aquatic plants are planted on the mixed matrix, and effective removal of lakeside nitrogen and phosphorus is achieved through the synergistic effect of the three. The raw materials, namely the dry reed stems, adopted in the method are cheap and easy to obtain, the technical operation is simple and feasible, andthe technology has the advantages of being low in investment cost, low in energy consumption and the like.

Description

technical field [0001] The invention relates to the field of restoration of the water ecological environment, in particular to the technology of regulating the matrix of the lakeside zone through biochar and reed straw to strengthen the removal of nitrogen and phosphorus. Background technique [0002] The lakeside zone is the transition zone between the terrestrial ecosystem and the aquatic ecosystem of lakes and rivers, and has the functions of intercepting, retaining, depositing, adsorbing, and settling pollutants. Under the influence of external factors, exogenous pollutants can only enter rivers, lakes and other water bodies through the lakeside zone. The lakeside zone can intercept a large number of land-source pollutants and filter surface runoff pollutants, thereby reducing the purification burden of entering the water body. However, the intercepted and retained nitrogen and phosphorus loads in the lakeside zone are relatively high, which often exceeds its self-purifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F101/10C02F101/16
CPCC02F3/32C02F2101/10C02F2101/16
Inventor 梁文艳李慧贤张盼月王洪杰
Owner BEIJING FORESTRY UNIVERSITY
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