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A modular farmland drainage cascade purification total nitrogen removal system and method thereof

A purification system and farmland drainage technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of lack of pertinence in total nitrogen removal, large area of ​​constructed wetland, High operating costs and other issues, to optimize the population structure of denitrifying bacteria, improve denitrification effect, low investment and operating costs

Active Publication Date: 2020-02-07
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of constructed wetland covers a large area, requires a large investment, high operating costs, and lacks the pertinence of total nitrogen removal.

Method used

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  • A modular farmland drainage cascade purification total nitrogen removal system and method thereof
  • A modular farmland drainage cascade purification total nitrogen removal system and method thereof
  • A modular farmland drainage cascade purification total nitrogen removal system and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to Figure 1-5 , a modular farmland drainage cascade purification total nitrogen removal system, comprising a farmland 1, an S-type modular denitrification purification system 2, an ecological ditch 3 and a cascade nitrification purification system 4 connected in sequence.

[0041] The S-type modular denitrification purification system 2 includes a side baffle 2-1, a middle partition 2-2, and a denitrification purification area 2-3; the side baffle 2-1 encloses an S-shaped modular denitrification purification system , multiple intermediate partitions 2-2 divide the S-type module denitrification purification system into multiple denitrification purification zones 2-3. The section of the S-type module denitrification purification system is "L"-shaped (including two parts perpendicular to the farmland direction and along the water flow direction), arranged in steps according to the water flow direction, and descending in turn. The total length is 6-8m, of which the ...

Embodiment 2

[0066] Others are the same as embodiment 1.

[0067] 25mg / L≤TN<35mg / L, using S-type modular denitrification purification system 2, a total of 2 groups; the water quality before and after treatment is shown in Table 2.

[0068] Table 2 embodiment 2 water quality situation before and after treatment

[0069] index pH Total nitrogen content TN(mg / L) NH 3 -N (mg / L)

Embodiment 3

[0071] Others are the same as embodiment 1.

[0072] 35mg / L≤TN<40mg / L, using S-type modular denitrification purification system 2, a total of 3 groups; the water quality before and after treatment is shown in Table 3.

[0073] Table 3 embodiment 3 water quality situation before and after treatment

[0074]

[0075]

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Abstract

The invention discloses a system for removal of modular farmland drainage gradient purification total nitrogen and a method thereof. The system comprises a farmland, S-type denitrification purification systems, an ecological ditch and a gradient nitrification system which are sequentially connected, wherein each of the S-type modular nitrification purification systems includes a side surface baffle plate and denitrification purification regions separated by intermediate partition plates; the ecological ditch includes a plant purification region and an adjustment weir plate which is disposed atan end part; the gradient nitrification system includes a fixed weir plate and nitrification purification regions separated by exchangeable weir plates; ammonia nitrogen in nitrogen-containing sewagedrained by the farmland is converted into nitrate nitrogen and nitrite nitrogen in the gradient nitrification purification system, nitrate nitrogen and nitrite nitrogen are converted into nitrogen inthe S-type modular denitrification purification systems. The number of the S-type modular denitrification purification systems and the exchangeable weir plates is adjustable. According to the systemfor removal of modular farmland drainage gradient purification total nitrogen and the method thereof, the in-situ efficient denitrification purification is implemented according to local conditions, the stability is high, the operation is flexible, the investment is small, the operation cost is low, the process operation is simple and the ecological environment benefit is good.

Description

technical field [0001] The invention belongs to the fields of environmental protection and water body restoration, and in particular relates to a method for removing total nitrogen by modularized farmland drainage cascade purification. Background technique [0002] With the rapid development of my country's planting industry, the amount of chemical fertilizers used in farmland planting continues to increase, and the nitrogen content and loss of nitrogen in farmland soil continue to increase, resulting in increased water pollution around farmland and eutrophication of water. Farmland non-point source areas are large in area, wide in scope, difficult to control and long in cycle. In practice, farmers pursue high yields, and the application of nitrogen fertilizers exceeds the actual demand for plant growth, which intensifies non-point source pollution. At present, the non-point source of farmland mainly adopts water and fertilizer control technology, ecological interception te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F3/30
CPCC02F3/302C02F3/32
Inventor 沈晓笑马吴成邵孝侯
Owner HOHAI UNIV
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