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Carbon emission material for renovation of nitrogen hydrogen nitrate pollution groundwater and production method

A groundwater remediation and nitrate nitrogen technology, applied in anaerobic digestion treatment and other directions, to avoid loss, slow down the release rate, and reduce the specific surface area.

Inactive Publication Date: 2010-06-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcoming in the microbial remediation technology of the existing nitrate-nitrogen polluted groundwater, and provide a novel, efficient and economically feasible nutrient-composite carbon-releasing material and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation process of nutrient composite carbon-releasing material is: glucose, sodium hypophosphite, KH 2 PO 4 , trace elements (by MgSO 4 ·7H 2 O, Fe 2 (SO 4 ) 3 , MnSO 4 ·H 2 O, ZnSO 4 ·H 2 O composition), coarse sand, and cement are mixed evenly, and after adding water, they are sent to a granulator for granulation to obtain solid particles of nutritional composite carbon-releasing materials. The mass percent of above-mentioned mixture is as follows: glucose is 25%; Sodium hypophosphite is 30%; KH 2 PO 4 5%; trace elements are 5% (of which MgSO 4 ·7H 2 O is 1.45%, Fe 2 (SO 4 ) 3 1.05%, MnSO 4 ·H 2 O is 1.30%, ZnSO 4 ·H 2 O is 1.20%); coarse sand is 15%; cement is 10%; water is 10%.

Embodiment 2

[0025] The production process of nutrient compound carbon-releasing material is: sodium citrate, ferrous sulfate, KH 2 PO 4 , trace elements (by MgSO 4 ·7H 2 O, Fe 2 (SO 4 ) 3 , MnSO 4 ·H 2 O, ZnSO 4 ·H 2 O composition), coarse sand, and cement are mixed evenly, and after adding water, they are sent to a granulator for granulation to obtain solid particles of nutritional composite carbon-releasing materials. The mass percent of above-mentioned mixture is as follows: sodium citrate is 40%; Ferrous sulfate is 19%; KH 2 PO 4 10%; trace elements 1% (of which MgSO 4 ·7H 2 O is 0.30%, Fe 2 (SO 4 ) 3 0.15%, MnSO 4 ·H 2 O is 0.40%, ZnSO 4 ·H 2 O is 0.15%); coarse sand is 10%; cement is 15%; water is 5%.

Embodiment 3

[0027] The production process of nutrient compound carbon-releasing material is: corn flour, sodium sulfite, KH 2 PO 4 , trace elements (by MgSO 4 ·7H 2 O, Fe 2 (SO 4 ) 3 , MnSO 4 ·H 2 O, ZnSO 4 ·H 2 O composition), coarse sand, and cement are mixed evenly, and after adding water, they are sent to a granulator for granulation to obtain solid particles of nutritional composite carbon-releasing materials. The mass percent of above-mentioned mixture is as follows: corn flour is 35%; Sodium sulfite is 10%; KH 2 PO 4 8%; trace elements 3% (of which MgSO 4 ·7H 2 O is 1.00%, Fe 2 (SO 4 ) 3 0.50%, MnSO 4 ·H 2 O is 0.95%, ZnSO4 ·H 2 O is 0.55%); coarse sand is 18%; cement is 13%; water is 13%.

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Abstract

The invention relates to a carbon release material for purifying groundwater polluted by nitrate nitrogen, which substantially comprises a carbon release agent, an oxygen capture agent, a KH2PO4, trace elements, coarse sand, cement and water, in which the carbon release agent provides carbon for the denitrification degradation process of the microorganism; the oxygen agent is used for capturingand consuming the dissolved oxygen in the groundwater to create an anaerobic environment; the KH2PO4 and the trace elements provide the required nutrient elements for metabolism of the microorganism;the coarse sand is used for promoting permeability of the carbon release material; the cement and the water adhere other components together in the carbon release material. A contrast test of denitrification degradation of nitrate nitrogen in the groundwater proves that the nutrition compound carbon release material in the invention can allow concentration of the dissolved oxygen in the water to decrease from 4.1mg / L to about 0.1mg / L as well as the concentration of the nitrate nitrogen to decrease from 103.4mg / L to 2.5mg / L; the degradation rate is as high as 97.6 percent while the degradationrate of the degradation rate in the contrast text is only up to 50.2 percent.

Description

technical field [0001] The invention relates to the technical field of contaminated groundwater remediation, in particular to a composite material and a preparation method for dissolved oxygen capture, carbon source and nutrient supply in the microbial remediation process of groundwater polluted by nitrate nitrogen. Background technique [0002] The degree of nitrate nitrogen pollution in groundwater is increasing year by year. Drinking water with a high concentration of nitrate nitrogen is not only fatal to pregnant women and infants, but also causes some cancers, and even directly leads to the "eutrophication" of surface water that is supplied by groundwater. [0003] At present, the groundwater polluted by nitrate nitrogen is often treated by means of extraction treatment: the polluted groundwater is pumped to the surface through pumping wells, and then various sewage treatment methods are used to remove nitrate nitrogen. According to the different removal mechanism of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
Inventor 刘涉江赵林谭欣刘秀丽齐云毛国柱
Owner TIANJIN UNIV
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