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Method for blocking and absorbing nitrogen and phosphorus flowing away from paddy field by utilizing water discharging channel

A drainage ditch and paddy field technology, which is applied in the field of phosphorus non-point source pollution control and agricultural nitrogen, can solve the problems of nitrogen loss, low-efficiency interception effect, difficulty in obvious control of paddy field nitrogen and phosphorus non-point source pollution, etc., to improve transparency and increase The effect of dwell time

Active Publication Date: 2015-03-04
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method of using water plants to solve the problem that the current routine relying on aquatic plants generally only has about 10% low-efficiency interception effect on high-concentration paddy field drainage nitrogen and phosphorus in ditches, which makes it difficult to obviously control the non-point source pollution of paddy field nitrogen and phosphorus. Method for Drainage Ditch to Intercept Nitrogen and Phosphorus Loss from Paddy Fields

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  • Method for blocking and absorbing nitrogen and phosphorus flowing away from paddy field by utilizing water discharging channel
  • Method for blocking and absorbing nitrogen and phosphorus flowing away from paddy field by utilizing water discharging channel
  • Method for blocking and absorbing nitrogen and phosphorus flowing away from paddy field by utilizing water discharging channel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (screening to aquatic plant combination)

[0023] According to the concentration of nitrogen and phosphorus in general paddy field drainage, adjust the initial concentration of total phosphorus TP in sewage to 5 mg L -1 , the initial concentration of total nitrogen TN was 50 mg L -1 . Aquatic plants choose floating plants - water lily and yellow water dragon, emergent plants - Zailihua, evergreen iris and canna, submerged plants - jucao, planting density is 50 m -2 . After 15 days of experiments, it was found that the removal efficiencies of TN and TP were the highest, reaching 49.6% and 48.8% respectively ( figure 1 ); the removal rates of Zailihua, Evergreen Iris and Canna all reached more than 30%; while the removal rates of Jucao on nitrogen and phosphorus were all lower than 20%, the effect was the worst.

[0024] Considering that it is necessary to reduce the blocking effect of high-density aquatic plants on water flow in actual engineering, usin...

Embodiment 2

[0025] Embodiment 2: (screening to matrix combination)

[0026] Through the isothermal adsorption test, the adsorption characteristics of nitrogen and phosphorus on five kinds of matrices including vermiculite, fly ash, pyrolite, activated carbon and bauxite were studied. Among them, NH 4 + -N concentrations of 5, 10, 20, 40, 60 and 80 mg L -1 , with TP concentrations of 1, 2, 4, 6, 8 and 10 mg L -1 , The test was carried out for 24h. Five substrates for NH 4 + The adsorption characteristics of -N and TP were fitted by Langmuir equation. The results showed that vermiculite on NH 4 + The saturated adsorption amount of -N is the largest, but the saturated adsorption amount of TP is the smallest, the saturated adsorption amount of fly ash is the largest for TP, and the saturated adsorption amount for NH 4 + The saturated adsorption amount of -N is smaller (Table 1).

[0027] Table 1 NH of five tested matrices 4 + -N and TP isotherm adsorption curve related parameters ...

Embodiment 3

[0032]Example 3: (Method 1 of using drainage ditches to intercept and absorb nitrogen and phosphorus loss from paddy fields)

[0033] Proceed as follows:

[0034] (1) Scope of application: The ratio of the water surface area of ​​the drainage ditches to the area of ​​the paddy field is 1:1000; the average daily drainage of the paddy field is 30 tons per hectare, and the average concentration of total nitrogen in the drainage is 5.26 mg L -1 , the average concentration of total phosphorus was 0.52 mg L -1 .

[0035] (2) The structure of the drainage ditch: it is composed of the combined absorption area of ​​aquatic plants in the front section, the combined absorption area of ​​matrix in the rear section and the drainage gate at the end, wherein the length ratio of the combined absorption area of ​​aquatic plants and the combined absorption area of ​​matrix is ​​2:1 ;specifically is:

[0036] 1) Aquatic plant combined absorption area: It is composed of biological filter box, ...

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Abstract

The invention discloses a method for blocking and absorbing nitrogen and phosphorus flowing away from a paddy field by utilizing a water discharging channel, and belongs to the technical field of non-point source pollution control of nitrogen and phosphorus in agriculture. The front section of the channel is an aquatic-plant combined absorbing area; a plurality of biological filtering boxes are arranged at the bottom of the channel in an S shape, the boxes are filled with matrix, and aquatic-plant combination with high nitrogen and phosphorus absorption capability is planted in the water level of the channel and the biological filtering boxes; the rear section of the channel is a matrix combined absorption area, and a mixture of coal ash and vermiculite is laid at the bottom of the matrix combined absorption area; the tail end of the channel is provided with a gate for controlling the water discharging speed of the paddy field. The method disclosed by the invention has the advantages that the blocking rate of nitrogen and phosphorus in water discharged from the paddy field can reach 40-60%, and the transparency of a water body is obviously improved; the method is established on the basis of the original water discharging channel of the farmland, the cost of capital construction is greatly saved, and the aquatic plants and the absorbing matrix are also conveniently obtained.

Description

technical field [0001] The invention relates to the technical field of agricultural nitrogen and phosphorus non-point source pollution control, in particular to a method for intercepting and absorbing nitrogen and phosphorus loss from paddy fields by using drainage ditches. Background technique [0002] With the continuous improvement of agricultural intensification and scale, the problem of agricultural non-point source pollution has become increasingly prominent. The Bulletin of the First National Survey of Pollution Sources shows that agricultural sources are the main source of total nitrogen and total phosphorus emissions, accounting for 57.2% and 67.4% of the total emissions respectively; among them, the loss of total nitrogen in planting industry was 1.5978 million tons, and the loss of total phosphorus 108,700 tons, accounting for more than 50% of the total loss of agricultural sources. Rice is the most widely planted crop in the Taihu Lake Basin. Nitrogen and phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
CPCY02W10/10
Inventor 李华傅庆林景金富郭彬李凝玉刘琛丁能飞林义成
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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