Biological deoxidation denitrification method in oxidative environment groundwater and device thereof

A technology for oxidizing environment and groundwater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. problem, to achieve the effect of simple operation, low cost, economy and environmental protection advantages

Active Publication Date: 2012-06-27
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The solubility of hydrogen is low, the utilization rate is low, and the matrix transfer and material transfer from the gas phase to the liquid phase are limited;
[0008] 2. Injection system is required, the price of hydrogen is expensive, and the cost of engineering and operation and maintenance is high;
[0009] 3. The availability of carbon dioxide in groundwater is limited;
[0010] 4. Hydrogen reacts with O during use, transportation and storage 2 Flammable and explosive after mixing
[0014] ZVI in the form of iron shavings, nano-iron, granular iron, cast iron, iron filings and iron powder is used for NO 3 The study of -N chemical reduction and autotrophic denitrification has attracted the attention of researchers [Cheng et al., Reduction of nitrate to ammonia by zero-valent i...

Method used

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  • Biological deoxidation denitrification method in oxidative environment groundwater and device thereof
  • Biological deoxidation denitrification method in oxidative environment groundwater and device thereof
  • Biological deoxidation denitrification method in oxidative environment groundwater and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1 Biological Oxygen Removal and Denitrification Device for Groundwater in Oxygenating Environment

[0071] Such as figure 1As shown, the biological deoxygenation and denitrification device for groundwater in an oxidative environment of the present invention is a double-layer double-media osmotic reaction grid, which is composed of an upstream layer 1 and a downstream layer 2. Pine bark is added in the upstream layer 1, and pine bark is added in the downstream layer. Add zero-valent iron and sand to layer 2. The particle size of pine bark is 2.0-11.0mm. Zero-valent iron can be sponge iron, whose Fe 0 The content is >60.6%, and the particle size is 0.15-2.0mm. The sand particles can be natural river sand with a particle size of 0.45-2.0 mm. The function of the sand particles is to prevent the sponge iron plates from agglomerating and maintain the hydraulic conditions of the downstream layer unchanged. The masses of pine bark, sponge iron and sand grains are 7....

Embodiment 2

[0072] Static domestication and enrichment of embodiment 2 microorganisms

[0073] 2.1 Materials and Instruments

[0074] Pine bark: industrial grade, particle size 2.0~11.0mm, BET=0.46m 2 / g, Purchased from Beijing Zhongshu Dalin Flower Market;

[0075] Sponge Iron: Industrial Grade, Fe 0 >60.6%, the main impurity is SiO 2 , with a particle size of 0.15-2.0 mm, purchased from Beijing Kaibiyuan Co., Ltd.;

[0076] Sand: natural river sand with a particle size of 0.45-2.0mm;

[0077] NaHCO 3 : Beijing Chemical Plant (analytical pure);

[0078] NaNO 3 : Shantou Xilong Chemical Co., Ltd.;

[0079] K 2 HPO 4 : Beijing Fine Chemical Co., Ltd.;

[0080] Wide Mouth Frosted Jar (20L).

[0081] Microbial inoculum source: the inoculum source of aerobic heterotrophic bacteria, heterotrophic denitrification bacteria and autotrophic denitrification bacteria was taken from the soil in the corn field in the suburbs of Beijing (0.3m below the ground), with a particle size of 0.1...

Embodiment 3

[0091] Example 3 Preparation of Biological Oxygen Removal-Heterotrophic / Autotrophic Denitrification Double-layer Dual-Media Osmotic Reaction Grid (BD-HAD DLDM-PRB) and Its Effect on DO and NO in Groundwater 3 -N removes the application

[0092] 3.1 Materials and instruments

[0093] Pine bark: industrial grade, particle size 2.0~11.0mm, BET=0.46m 2 / g, Purchased from Beijing Zhongshu Dalin Flower Market;

[0094] Sponge iron: industrial grade, particle size 0.15-2.0mm, Fe 0 >60.6%, the main impurity is SiO 2 , BET=0.49m 2 / g, Purchased from Beijing Kaibiyuan Co., Ltd., the particle size is 0.15-2.0mm;

[0095] Sand: natural river sand with a particle size of 0.45-2.0mm.

[0096] 3.2 Preparation of BD-HAD DLDM-PRB

[0097] 1) For sieving pine bark, the selected particle size is 2.0-11.0mm; for sieving sponge iron, the selected particle size is 0.15-2.0mm; for sieving sand, the selected particle size is 0.45-2.0mm.

[0098] 2) Weigh the pine bark, sponge iron and san...

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Abstract

The invention relates to a biological deoxidation denitrification device in oxidative environment groundwater. The device is a double-layer double-media permeable reactive barrier, the permeable reactive barrier is formed by an upstream layer and a downstream layer, the upstream layer is loaded with pine barks, and the downstream layer is loaded with zero valent iron. The invention also provides a biological deoxidation-heterotrophic/autotrophic denitrification combination method in the oxidative environment groundwater. The method comprises a process that the biological deoxidation denitrification device is laid in nitrate nitrogen polluted oxidative environment groundwater pollution plumage downstream soil and an underground water layer, and the device is vertical with the flow direction of the underground water.

Description

technical field [0001] The invention relates to a method for removing oxygen and denitrification for biological restoration of polluted groundwater, in particular to a novel combined method and device for combining biological oxygen removal-heterotrophic / autotrophic denitrification. Background technique [0002] Nitrate nitrogen (NO 3 -N) is one of the most common pollutants in groundwater worldwide, and its pollution has become a worldwide environmental and health problem. High concentrations of NO were found in groundwater on 6 continents except Antarctica 3 -N. Human intake of high NO 3 -N can cause serious illness and even death. long-term exposure to NO 3 -N and nitrite nitrogen (NO 2 -N) can cause polyuria, spleen hemorrhage, "blue baby syndrome" and so on. During 1945-1970, there were 2,000 cases of "blue baby disease" in the world, of which 8% died. In addition, NO 3 -N and NO 2 -N is the precursor of nitroso compounds (N-nitroso Compounds, NOCs). NOCs can...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 刘菲黄国鑫朱玲玲胡红岩杨应钊李圣品
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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