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A photocatalytic system and application method for low-concentration ammonia nitrogen emission reduction in rice field drainage

A low-concentration ammonia nitrogen and photocatalytic technology, applied in the field of photocatalytic systems, can solve the problems of difficult powderization of photocatalysts, low quantum conversion efficiency, and difficulties in field power supply, and achieve the effects of wide application, low cost, and high solution cost

Active Publication Date: 2018-06-01
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photocatalytic reaction requires ultraviolet light to act, while the ultraviolet light efficiency of sunlight is low, artificial ultraviolet lamps require additional power input, and it is difficult to connect electricity to the field and the cost is high
Photocatalytic technology has limitations such as narrow photoresponse range, low quantum conversion efficiency, and difficulty in powdering photocatalysts, which to a certain extent have affected the promotion of this technology.

Method used

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  • A photocatalytic system and application method for low-concentration ammonia nitrogen emission reduction in rice field drainage
  • A photocatalytic system and application method for low-concentration ammonia nitrogen emission reduction in rice field drainage
  • A photocatalytic system and application method for low-concentration ammonia nitrogen emission reduction in rice field drainage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 A photocatalytic system for rice field drainage with low concentration of ammonia nitrogen. The effect of different catalytic time to remove ammonia nitrogen

[0045] This embodiment examines the effect of a photocatalytic system for reducing the reduction of low-concentration ammonia nitrogen in rice field drainage with different catalytic times to remove ammonia nitrogen. The initial water sample of the experiment is 50mg·L -1 The ammonia nitrogen solution. The initial water sample was adjusted under the optimized pH and reaction temperature. The UV light source was irradiated for 2 hours, and the sample was taken every 20 minutes. After filtration, the ammonia nitrogen concentration in the water sample was determined. figure 1 Where t is the reaction time, and c is the ammonia nitrogen concentration removed during the reaction t. After 120 minutes of photocatalysis, nearly 50% of the ammonia nitrogen was decomposed.

Embodiment 2

[0046] Example 2 The removal effect of photocatalyst concentration on ammonia nitrogen in a photocatalytic system with low concentration of ammonia nitrogen for rice field drainage

[0047] This embodiment examines the removal effect of photocatalyst concentration on ammonia nitrogen in a photocatalytic system for reducing low-concentration ammonia nitrogen in rice field drainage. The specific operation method of this example is similar to that of Example 1. figure 2 . The result shows that the catalyst concentration is 1.0g·L -1 At this time, the photocatalytic removal effect of ammonia nitrogen was the best, and the removal rate of ammonia nitrogen reached 46%. If the catalyst concentration is too low or too high, the ammonia nitrogen removal effect will decrease.

Embodiment 3

[0048] Example 3 The effect of the temperature of the reaction solution on the removal of ammonia in a photocatalytic system with low concentration of ammonia nitrogen for rice field drainage

[0049] This embodiment examines the effect of the temperature of the reaction solution on the removal of ammonia nitrogen in a photocatalytic system for reducing low-concentration ammonia nitrogen in rice field drainage. The specific operation mode of this embodiment is similar to that of Embodiment 1. The experimental results are as image 3 As shown, the removal rate of ammonia nitrogen increases with increasing temperature. The removal rate of ammonia nitrogen can reach 90% at 60°C and 60% at 40°C. In summer, the temperature in the field reactor can reach more than 40°C, which is a catalytic reaction. It provides suitable temperature conditions.

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Abstract

The invention discloses a photocatalytic system and an application method for reducing discharge of low-concentration ammonia nitrogen in paddy field drainage, and belongs to the field of paddy field drainage purification. The system self-catalyzes and degrades low-concentration ammonia nitrogen in paddy field drainage without applying external energy, reducing the risk of non-point source pollution caused by paddy field drainage. It includes three subsystems: solar-based power generation and electric energy storage system, paddy field drainage pretreatment system And photocatalytic reactor systems based on specific nanocatalytic materials. The power generation and electric energy storage system provides clean and continuous energy for the photocatalytic reactor system, and finally converts solar energy into ultraviolet radiation; the ammonia nitrogen drainage from the paddy field first enters the pretreatment system to remove plant residues and sediment and other substances that affect the photocatalytic reaction ; Then enter the photocatalytic reactor system, adjust the speed of the agitator and the intensity of the ultraviolet light according to the water quality and water volume, and discharge it through the drain valve after the ammonia nitrogen concentration drops, forming a green and environmentally friendly treatment method for ammonia nitrogen polluted water in paddy fields.

Description

Technical field [0001] The invention relates to a paddy field drainage purification system, in particular to a photocatalytic system that combines solar energy and photocatalysis for the reduction of low-concentration ammonia nitrogen in paddy field drainage and a method of use. Background technique [0002] Paddy field drainage [0003] In recent years, due to excessive fertilization and irrational fertilization structure, a large amount of nitrogen has been imported into rivers, rivers, and lakes, causing increasingly serious agricultural non-point source pollution problems, leading to deterioration of water quality and increasing eutrophication of water bodies. More than 50% of the nitrogen sources in lakes come from agricultural non-point source pollution. For example, in the Taihu Lake area, agricultural non-point sources account for 77% of the total nitrogen into the lake. The nitrogen loss in the farmland leakage during the rice cultivation period is mainly ammonia nitrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08
CPCY02W10/37
Inventor 冯彦房刘杨何世颖杨林章薛利红叶茂高倩
Owner JIANGSU ACAD OF AGRI SCI