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Permeable reaction medium material for nitrate pollution of underground water

A reaction material, nitrate technology, applied in the preparation of the above-mentioned permeable reaction medium material, in the field of permeable reaction medium material, can solve the problems of affecting groundwater repair ability, clogging of reaction wall, hardening of reaction material, etc., so as to avoid secondary pollution , rapid activation, and the effect of reducing dissolved oxygen content

Active Publication Date: 2014-05-21
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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AI Technical Summary

Problems solved by technology

But Fe 0 After being oxidized, it is easy to interact with some ions in the groundwater to form precipitation, which will cause the reaction material to harden, cause the reaction wall to be blocked, and affect the repair ability of the groundwater

Method used

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Examples

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Effect test

preparation example Construction

[0024] Preparation method of the present invention:

[0025] 1) Take quartz sand, denitrifying bacteria, chitosan, CaCl according to the mass ratio of 1~3:0.1~0.5:1~3:1.5~3:0.5~1:0.5~1.5:50 2 , sodium alginate, coated nano-iron and Na with a pH of 7 2 HPO 4 -NaH 2 PO 4 buffer solution;

[0026] 2) Fully mix sodium alginate, chitosan, 0.5-1mm quartz sand and buffer solution in an automatic mixer at a constant temperature of 30-40°C at 90-200r / min, and react for 30-40min to obtain a mixed solution , cooled to room temperature;

[0027] 3) Add coated nano-iron and denitrifying bacteria powder into the mixture, stir and mix evenly to prepare granulation slurry;

[0028] 4) Take the good CaCl 2 The solid is dissolved in pure water to produce CaCl with a mass concentration of 3-6%. 2 Aqueous solution of crosslinking agent

[0029] 5) Add the granulation slurry in step 3 dropwise to the CaCl prepared in step 4 at a rate of 1-3 drops / s 2 In the cross-linking agent aqueous so...

Embodiment 1

[0033] Weigh 2kg of sodium alginate, 2kg of chitosan, and 4kg of quartz sand (0.5mm) and mix them evenly, then pour 100L of Na 2 HPO 4 -NaH 2 PO 4 The buffer solution was reacted at 40°C and 100r / min with a constant temperature stirrer for 30 minutes to obtain a mixed solution, which was cooled to room temperature; then 0.5kg of denitrifying bacteria powder and 1kg of coated nano-iron (50nm) were added to the above mixed solution, Stir evenly to obtain a granulation slurry; then add the granulation slurry dropwise to CaCl with a mass volume concentration of 5%. 2 In the cross-linking agent aqueous solution, cross-link at room temperature for 24 hours, granulate into spherical particles with a particle size of 3-5mm; place in a ventilated place at 20°C and air-dry for 8 hours to obtain a permeable reaction medium material (3-5mm), freeze for later use .

[0034] 50kg of the prepared permeable reaction medium material and 100kg of zeolite (3mm) (mass ratio 1:2) were used as ...

Embodiment 2

[0036] Weigh 1kg sodium alginate, 4kg chitosan, 6kg quartz sand (0.5mm) into 100L pH=7 Na 2 HPO 4 -NaH 2 PO 4 The buffer solution was reacted at 40°C and 100r / min constant temperature stirrer for 30 minutes to obtain a mixed solution, which was cooled to room temperature; then 0.5kg of denitrifying bacteria powder and 1kg of coated nano-iron (50nm) were added to the above mixed solution , and stir evenly to obtain a granulation slurry; this granulation slurry is added dropwise to CaCl with a mass volume concentration of 5%. 2In the cross-linking agent aqueous solution, cross-link at room temperature for 24 hours, granulate into spherical particles with a particle size of 4-6mm; place in a ventilated place at 20°C and air-dry for 8 hours to obtain a permeable reaction medium material (4-6mm), freeze for later use .

[0037] 50kg of the prepared permeable reaction medium material and 100kg of zeolite (3mm) (mass ratio 1:2) were used as the medium material of the permeable re...

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Abstract

The invention relates to a permeable reaction material for nitrate pollution of underground water. The permeable reaction medium material consists of quartz sand, denitrifying bacteria, chitosan, CaCl2, sodium alginate, coated nano iron and a Na2HPO4-NaH2PO4 buffering solution with the pH value of 7 at a mass ratio of (1-3):(0.1-0.5):(1-3):(1.5-3):(0.5-1):(0.5-1.5):50. The invention also discloses a method for preparing the permeable reaction material. By adopting the permeable reaction medium material, not only can the carbon source be released for the growth of microorganisms, but also the reducing environment of the underground water can be enhanced, the denitrifying rate is increased, the water quality is purified, and the secondary pollution problem of the nitrate reduction product can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of groundwater pollution restoration, and in particular relates to a permeable reaction medium material used for groundwater nitrate pollution. [0002] The present invention also relates to a method for preparing the above-mentioned permeable reaction medium material. Background technique [0003] Excessive application of nitrogen fertilizers, discharge of a large amount of industrial and agricultural wastewater and waste, reclaimed water irrigation, livestock and poultry breeding, landfill and other production and lifestyles seriously threaten the groundwater environment, making nitrate pollution in groundwater increasingly prominent, which has become an environmental problem of widespread concern in the world . [0004] Biological denitrification and chemical denitrification are currently the main methods for removing nitrate in groundwater. Biological denitrification is a very ideal method, and it is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F103/06
Inventor 姜永海席北斗杨昱祝超伟安达王玉焕
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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