First-class returning-water quality percolating and purifying device for farmland

Abstract

The invention relates to a first-class returning-water quality percolating and purifying device for a farmland. The first-class returning-water quality percolating and purifying device for the farmland structurally comprises a fixed support, percolating and purifying tanks, a water draining baffle plate, a nanometer purification net, water-blocking blocks, a nanometer composite material and a fixing bottom plate, wherein the fixed support is fixedly arranged on a farmland water draining port; three rows of grooves are correspondingly arranged on two sides of the support and are respectively apurification net installation groove, a baffle plate installation groove and a purification tank installation groove sequentially and correspondingly provided with the nanometer purification net, thewater draining baffle plate and the percolating and purifying tanks; during installation, the purification net installation groove is ensured to be installed on the farmland water draining inflow side; during an undrainage period of the farmland, the water draining baffle plate is inserted, and a water body pollutant near the water draining port can be degraded and removed through the nanometer purification net; during farmland drainage, the water draining baffle plate is taken down, and the water-blocking blocks are arranged in the purification tank installation groove according to a field water level requirement and are then overlapped and placed into the percolating and purifying tanks so as to form a column of percolating wall; the percolating and purifying tanks are open-type, so thatthe nanometer composite material can be conveniently updated and recovered.

Description

technical field

[0001] The invention relates to a first-stage receding water quality filtration and purification device for farmland, and belongs to the technical field of farmland non-point source pollution control. Background technique

[0002] Under the agricultural development model centered on "increasing production and income", pesticides and chemical fertilizers are widely used in agricultural production in my country, and generally only 10%-20% of the sprayed pesticides are attached to the crops, while the crop absorption rate of the applied chemical fertilizers is only 30%. %about. A considerable part of the chemical fertilizers and pesticides that are not used by crops flows into surface water bodies with the retreat of irrigated farmland or runoff after rain, and has become the main reason for the deterioration of water quality in rivers and lakes.

[0003] The concentration of pollutants in the first-level drainage ditches of farmland is high, and the first-level...

Examples

preparation example Construction

[0030] The preparation method of the nano-composite material 6 is preferably dipping-pulling method, the nano-photocatalyst is preferably nano-titanium dioxide, and the carrier material can be porous ceramsite, porous glass spheres, glass fibers, etc., and the preparation steps of the nano-composite material 6 include:

[0031] (1) Preparation of photocatalyst sol by sol-gel method: the method is the same as that of nano-purification mesh 4, and will not be repeated here.

[0032] (2) Nanophotocatalyst-carrier loading, specifically, use crucible tongs or other tools that can play a supporting role to fix the filter with carrier material, and immerse it in anatase nano-TiO 2 After 5 minutes in the load solution, lift the surface of the liquid to stand for 15 minutes, repeat 4 to 5 times, and then rinse with pure water for 10 minutes to remove the anatase nano-TiO that is not tightly attached. 2 ; Dry at room temperature for 24 hours and then roast at high temperature (the tempe...

Embodiment

[0039] A filter and purification device for first-stage backwater in farmland, the structure of which includes a fixed bracket 1, a filter purification box 2, a drainage baffle 3, a nano-purification net 4, a water-blocking block 5, a nano-composite material 6, and a fixed bottom plate 10; Among them, the fixed bracket 1 is fixedly installed at the drainage outlet of the farmland, and there are three rows of grooves corresponding to the two sides of the bracket, which are respectively the installation groove 7 of the purification net, the installation groove 8 of the baffle and the installation groove 9 of the purification box, and correspondingly install the nano purification net in turn. 4. Drainage baffle 3 and percolation purification box 2. When installing, ensure that the installation tank 7 of the purification net is on the side of the farmland drainage water; during the non-drainage period of the farmland, insert the drainage baffle 3, and the water body pollutants near ...

technical field

[0001] The invention relates to a first-stage receding water quality filtration and purification device for farmland, and belongs to the technical field of farmland non-point source pollution control. Background technique

[0002] Under the agricultural development model centered on "increasing production and income", pesticides and chemical fertilizers are widely used in agricultural production in my country, and generally only 10%-20% of the sprayed pesticides are attached to the crops, while the crop absorption rate of the applied chemical fertilizers is only 30%. %about. A considerable part of the chemical fertilizers and pesticides that are not used by crops flows into surface water bodies with the retreat of irrigated farmland or runoff after rain, and has become the main reason for the deterioration of water quality in rivers and lakes.

[0003] The concentration of pollutants in the first-level drainage ditches of farmland is high, and the first-level...

Examples

preparation example Construction

[0030] The preparation method of the nano-composite material 6 is preferably dipping-pulling method, the nano-photocatalyst is preferably nano-titanium dioxide, and the carrier material can be porous ceramsite, porous glass spheres, glass fibers, etc., and the preparation steps of the nano-composite material 6 include:

[0031] (1) Preparation of photocatalyst sol by sol-gel method: the method is the same as that of nano-purification mesh 4, and will not be repeated here.

[0032] (2) Nanophotocatalyst-carrier loading, specifically, use crucible tongs or other tools that can play a supporting role to fix the filter with carrier material, and immerse it in anatase nano-TiO 2 After 5 minutes in the load solution, lift the surface of the liquid to stand for 15 minutes, repeat 4 to 5 times, and then rinse with pure water for 10 minutes to remove the anatase nano-TiO that is not tightly attached. 2 ; Dry at room temperature for 24 hours and then roast at high temperature (the tempe...

Embodiment

[0039] A filter and purification device for first-stage backwater in farmland, the structure of which includes a fixed bracket 1, a filter purification box 2, a drainage baffle 3, a nano-purification net 4, a water-blocking block 5, a nano-composite material 6, and a fixed bottom plate 10; Among them, the fixed bracket 1 is fixedly installed at the drainage outlet of the farmland, and there are three rows of grooves corresponding to the two sides of the bracket, which are respectively the installation groove 7 of the purification net, the installation groove 8 of the baffle and the installation groove 9 of the purification box, and correspondingly install the nano purification net in turn. 4. Drainage baffle 3 and percolation purification box 2. When installing, ensure that the installation tank 7 of the purification net is on the side of the farmland drainage water; during the non-drainage period of the farmland, insert the drainage baffle 3, and the water body pollutants near ...

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