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High-salinity agricultural irrigation back water and soil improvement constructed wetland substrate structure and constructing method

A soil improvement and artificial wetland technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., can solve problems such as inability to increase soil organic matter content, and little improvement in soil fertility , to achieve the effect of preventing water leakage, strong application value and low construction cost

Inactive Publication Date: 2014-05-14
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

At present, desulfurization gypsum is mainly used in salinized soil, but it cannot increase the content of soil organic matter, and has little effect on improving soil fertility.

Method used

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  • High-salinity agricultural irrigation back water and soil improvement constructed wetland substrate structure and constructing method
  • High-salinity agricultural irrigation back water and soil improvement constructed wetland substrate structure and constructing method

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Embodiment 1

[0018] The size of the area of ​​the present invention can be determined according to the actual situation. The substrate uses non-polluting soil, desulfurized gypsum, fly ash, coal gangue and gravel, which are respectively from bottom to top: 30cm gravel layer, 20cm coal gangue layer, 30cm fly ash and desulfurization Gypsum mixed layer, 20cm non-polluted soil layer, a total of 100cm. The quality of the soil matrix has reached the second level of the soil environmental quality standard (GB15618-1995). The ratio of fly ash and desulfurized gypsum is 1:1, so that the pH of the mixture is 7, and the top is covered with uncontaminated soil, which is conducive to the growth of wetland plants. The fly ash of the present invention can intercept the salt ions in the water body through adsorption, the desulfurization gypsum can intercept the salt ions in the water body through the displacement reaction, and the coal gangue has a pH of about 5, which can neutralize the alkalinity in the...

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Abstract

The invention discloses a high-salinity agricultural irrigation back water and soil improvement constructed wetland substrate structure and a constructing method thereof, belonging to the field of environmental protection. The substrate disclosed by the invention makes use of pollution-free soil, desulfurization gypsum, coal ash, coal gangue and gravel; wetland plant mainly includes reed and cattail; high-salinity agricultural irrigation back water serves as a receiving water body; inflow water is shut off when draining water at each time, and rest water just covers the gravel part after the drainage. Natural reoxygenation is implemented on the wetland through functions from water declining and water infiltration after the drainage. After operating an experimental wetland for one year, wetland plant is reaped and ground, and deposited sludge, matrix and plant root in the wetland are excavated and are uniformly mixed for saline-alkali soil improvement, showing that the experimental wetland achieves goals of treating wastes with wastes and recycling wastes. The wetland substrate structure disclosed by the invention is simple in structure, easily available in material and quite low in construction cost, and the structure has strong application value in respects of high-salinity agricultural irrigation back water treatment and water soil improvement.

Description

Technical field: [0001] The invention discloses a high-salt agricultural irrigation retreat water treatment and soil improvement type artificial wetland construction and a construction method, belonging to the field of environmental protection. Background technique: [0002] With the rapid development of modern agriculture, the use of chemical fertilizers and pesticides has increased year by year, and the irrigation pattern has undergone great changes, resulting in the increasingly barren soil of farmland in some large-scale agricultural irrigation areas, and the degree of salinization is becoming more and more serious, resulting in a decline in crop yield and quality. . The content of eutrophication pollutants in the agricultural irrigation water is increasing year by year, and the total salt content in the water is also increasing. At present, the use of artificial wetlands for agricultural irrigation and water return treatment is not high, and the wetland matrix is ​​not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32A01G1/00
CPCY02W10/10
Inventor 司万童刘菊梅蒋海明蔡禄王建英张雪峰
Owner INNER MONGOLIA UNIV OF SCI & TECH
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