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Method and reactor for removing nitrate in water

A technology for nitrate and water removal, applied in the direction of neutralized water/sewage treatment, reduced water/sewage treatment, etc., can solve the problems of poor impact load resistance, need for backflow, slow biological treatment, etc., and meet low requirements for operation management , fast reaction speed, fast denitrification effect

Inactive Publication Date: 2004-05-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using organic matter as a nutrient source or using hydrogen or sulfur as an electron donor has the characteristics of high efficiency and low consumption, but there are still some other problems, such as biological treatment is usually slow and requires reflux, and the survival and growth of bacteria are susceptible to temperature and other problems. Influenced by various factors, and a large amount of sludge is produced during the treatment process, the management requirements are relatively high, and it is not suitable for small-scale or decentralized water supply treatment.
In addition, its ability to resist impact load is poor, and it will cause bacteria and residual organic matter in the effluent. All these pollutants must be removed before the water is safe to drink, so there must be subsequent treatment processes to ensure the safety of drinking water quality

Method used

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  • Method and reactor for removing nitrate in water
  • Method and reactor for removing nitrate in water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1, add 900ml of distilled water and 2gPd-Cu / γ-Al in a closed stainless steel container with a volume of 1.5L 2 o 3 Catalyst, stir continuously at 300r / min with a magnetic stirrer, and continuously pass H in the container 2 After half an hour, add 1000mg / L NaNO 3 Solution 100ml, so that the total volume of the solution is 1000ml, the initial NaNO 3 The concentration is 100mg / L, and the reaction starts timing. The reaction temperature is 8 °C, H 2 The pressure and flow of the hydrogen generator are adjusted and controlled by the regulator and control valve at the outlet of the hydrogen generator. The pressure in the reactor was atmospheric pressure, and 0.5M HCl was used to adjust the pH to keep it at 5.2±0.2 during the reaction. When the reaction was carried out for 60 minutes, both the nitrate concentration and the nitrite concentration were less than 0.01 mg / L.

Embodiment 2

[0030] Embodiment 2, add the distilled water of 920ml and 1gPd-Cu / γ-Al in the closed stainless steel container that volume is 1.5L 2 o 3 Catalyst, stir continuously at 300r / min with a magnetic stirrer, and continuously pass H in the container 2 After half an hour, add 1000mg / L NaNO 3 solution 80ml, so that the total volume of the solution is 1000ml, the initial NaNO 3 The concentration is 80mg / L, and the reaction starts timing. The reaction temperature is 20 °C, H 2 The pressure and flow of the hydrogen generator are adjusted and controlled by the regulator and control valve at the outlet of the hydrogen generator. The pressure in the reactor was atmospheric pressure, and 0.2M HCl was used to adjust the pH to keep it at 4.0±0.2 during the reaction. When the reaction was carried out for 60 minutes, both the nitrate concentration and the nitrite concentration were less than 0.01 mg / L.

Embodiment 3

[0031] Embodiment 3, add the distilled water of 900ml and 1gPd-Cu / γ-Al in the closed stainless steel container that volume is 1.5L 2 o 3 Catalyst, stir continuously at 300r / min with a magnetic stirrer, and continuously pass H in the container 2 After half an hour, add 1000mg / L NaNO 3Solution 100ml, so that the total volume of the solution is 1000ml, the initial NaNO 3 The concentration is 100mg / L, and the reaction starts timing. The reaction temperature is 10 °C, H 2 The pressure and flow of the hydrogen generator are adjusted and controlled by the regulator and control valve at the outlet of the hydrogen generator. The pressure in the reactor is atmospheric pressure, and 0.1MH is used in the reaction process 2 SO 4 To adjust the pH to keep it at 6.0±0.2. When the reaction was carried out for 60 minutes, the nitrate concentration was 0.5 mg / L, and the nitrite concentration was <0.01 mg / L.

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Abstract

A process for removing nitrate from water includes adding carried bimetal catalyst to raw water and continuously introducing H2 in anaerobic condition to reduce the nitrate contained in water into N2. Its reactor has H2 inlet, gas outlet, pH probe, temp probe, acid solution feeding hole, and sampling hole. Its advantage is high effect (more than 99%).

Description

technical field [0001] The invention relates to a method and a reactor for removing nitrate in water, in particular to a method and a reactor for removing nitrate in groundwater, and belongs to the field of water treatment technology and equipment. Background technique [0002] Groundwater has always been one of the important sources of drinking water. Today, when surface water sources are generally polluted, the degree of dependence on groundwater will continue to increase. However, due to the application of a large amount of nitrogenous fertilizers and the unreasonable disposal of poultry manure, domestic sewage and nitrogenous industrial wastewater, the groundwater in many countries in the world has been polluted by nitrate, and there is a trend of worsening. Nitrate generated by nitrate-reducing bacteria in the human body will cause methemoglobinemia, and under the action of various nitrogen-containing organic compounds, it will form "three-caused" substances nitrosoamin...

Claims

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Application Information

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IPC IPC(8): B01J23/89C02F1/66C02F1/70
Inventor 陈英旭张燕刘宏远
Owner ZHEJIANG UNIV
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