CN112979088A - Reduction barrier for treating slag acidic wastewater and application thereof - Google Patents
Reduction barrier for treating slag acidic wastewater and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention relates to the technical field of slag acidic wastewater pollution prevention and treatment, in particular to a reduction barrier for treating slag acidic wastewater and application thereof. The invention provides a reducing barrier for treating slag acid wastewater, which comprises a regulating layer and a reducing layer stacked at the bottom of the regulating layer; the material of the regulating layer comprises an alkaline adsorbing material; the material of the reduction layer comprises activated sludge. According to the invention, the pH value of the slag acidic wastewater is adjusted and heavy metals are fixed through the synergistic effect of the alkaline adsorption material of the adjusting layer and the activated sludge of the reducing layer, so that the diffusion and migration of heavy metal pollutants are effectively fixed and limited for a long time, and finally, the content and the pH value of each heavy metal in the slag acidic wastewater can reach the II-class water quality required in the underground water quality standard (GB/T14848-2017).
Description
Technical Field
The invention relates to the technical field of slag acidic wastewater pollution prevention and treatment, in particular to a reduction barrier for treating slag acidic wastewater and application thereof.
Background
With the increasing expansion of resource development scale in China, the quantity of tailing piles, tailing ponds and metal processing waste piles formed in mining and mineral processing industries and metal processing industries is increased continuously, the tailing piles formed by mining wastes are exposed to natural conditions, sulfide minerals in the tailing piles are oxidized continuously, and leachate which has strong acidity and contains a large amount of heavy metals, namely slag acidic wastewater, is generated. The acid waste water of slag causes serious pollution to soil and underground water environment. The traditional slag acid wastewater treatment method such as hydraulic barriers constructed by various cushion layers has the disadvantages of large restriction of materials by geographical positions, high cost and no contribution to economy and environmental protection.
Chinese patent CN111592186A discloses a non-metal pollution source control barrier in slag, which comprises a neutralization layer, a filtering buffer layer, a sludge reduction barrier layer and a sludge control layer which are sequentially arranged; the neutralization layer comprises fly ash, but the control barrier disclosed in the patent comprises a four-layer structure, and the structure is complicated, so that the treatment efficiency of the acidic wastewater is low.
Disclosure of Invention
In view of the above, the invention provides a reduction barrier for treating slag acid wastewater and an application thereof, the reduction barrier provided by the invention has a simple structure, and the treated water quality meets the requirement of type II water quality in the underground water quality standard (GB/T14848-2017).
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a reducing barrier for treating slag acid wastewater, which comprises a regulating layer and a reducing layer stacked at the bottom of the regulating layer;
the material of the regulating layer comprises an alkaline adsorbing material; the material of the reduction layer comprises activated sludge.
Preferably, the basic adsorption material comprises one or more of fly ash, blast furnace slag, volcanic ash and coal gangue.
Preferably, the compaction thickness of the adjusting layer is 0.5-1 cm.
Preferably, the particle size of the alkaline adsorption material is 0.038-0.075 mm.
Preferably, the compacted thickness of the reduction layer is 0.5-2 cm.
Preferably, the water content of the activated sludge is 20-40%.
Preferably, the mass ratio of the adjusting layer to the reducing layer is 1: (5-10).
The invention also provides application of the reduction barrier for treating the slag acidic wastewater in slag acidic wastewater pollution prevention.
Preferably, the slag and the regulating layer in the reduction barrier are in contact.
Preferably, the mass ratio of the slag to the reduction barrier is (1.7-5): 1.
the invention provides a reducing barrier for treating slag acid wastewater, which comprises a regulating layer and a reducing layer stacked at the bottom of the regulating layer; the material of the regulating layer comprises an alkaline adsorbing material; the material of the reduction layer comprises activated sludge. In the invention, the alkaline adsorption material is used as a raw material for constructing the adjusting layer, and contains a large amount of alkaline substances to adjust the pH value of the acidic wastewater to 6.5-8.5 so as to ensure the activity of microorganisms in the activated sludge during the subsequent reduction treatment; microorganisms in the activated sludge generate a strong reduction environment through anaerobic reaction, so that the heavy metal ions are immobilized. According to the invention, the pH value is adjusted and heavy metals are fixed through the synergistic effect of the alkaline adsorption material of the adjusting layer and the activated sludge of the reducing layer, so that the diffusion and migration of heavy metal pollutants are effectively fixed and limited for a long time, and the slag acidic wastewater is effectively treated. Moreover, the slag acid wastewater only needs to pass through a two-layer treatment structure of a regulating layer and a reducing layer, so that the treatment efficiency of the wastewater is improved; the results of the embodiment show that when the reducing barrier for treating the acid slag wastewater provided by the invention is used for treating the acid slag wastewater generated in the Bayan euphwen Yuxin copper ore tailing pile place, the treated water reaches the II-class water quality required by the underground water quality standard, and the water quality has lower chemical component content and can be suitable for various purposes.
In addition, the material selected by the reducing barrier for treating the slag acidic wastewater provided by the invention is mainly waste, and when the reducing barrier constructed by the reducing barrier is used for treating the slag acidic wastewater, the effect of treating waste by waste is achieved, and meanwhile, the reducing barrier has the characteristic of low cost.
Drawings
FIG. 1 is a schematic sectional view of a slag acid wastewater reduction barrier according to example 1 of the present invention; in the figure, 1-slag, 2-regulating layer, 3-reducing layer, 4-simulated rainwater, 5-treated water;
FIG. 2 is a diagram showing the effect of removing copper and zinc from the slag acidic wastewater reduction barrier provided in embodiments 1 to 3 of the present invention.
Detailed Description
The invention provides a reducing barrier for treating slag acid wastewater, which comprises a regulating layer and a reducing layer stacked at the bottom of the regulating layer;
the material of the regulating layer comprises an alkaline adsorbing material; the material of the reduction layer comprises activated sludge.
The reduction barrier provided by the invention comprises a regulation layer, wherein the regulation layer is constructed by raw materials comprising an alkaline adsorption material, preferably the alkaline adsorption material; in the invention, the basic adsorption material preferably comprises one or more of fly ash, blast furnace slag, volcanic ash and coal gangue, and more preferably comprises fly ash, blast furnace slag and volcanic ash; in the present invention, when the alkali-adsorbing material preferably includes two or more of the above-mentioned specific substances, the mass ratio of the specific substances is not particularly limited in the present invention.
In the invention, the particle size of the alkaline adsorption material is preferably 0.038-0.075 mm.
In the invention, the compaction thickness of the adjusting layer is preferably 0.5-1 cm, and more preferably 0.65-0.8 cm.
In the invention, the alkaline adsorption material contains a large amount of alkaline substances, and the pH value of the acidic wastewater can be adjusted to 6.5-8.5, so that the activity of microorganisms in a subsequent activated sludge layer is ensured.
The reduction barrier provided by the invention comprises a reduction layer which is arranged at the bottom of the regulating layer in a stacking manner, wherein the reduction layer is constructed by raw materials comprising activated sludge, preferably the activated sludge; the water content of the activated sludge is preferably 20-40%, and more preferably 25-35%; the pH value of the activated sludge is preferably 7.3-7.8; the content of heavy metals in the activated sludge is preferably 0mg/L, and the heavy metals in the activated sludge preferably comprise lead ions, arsenic ions, zinc ions and copper ions. In a particular embodiment of the invention, the source of the activated sludge is an industrial sewage treatment plant.
In the invention, the compacted thickness of the reduction layer is preferably 0.5-2 cm, and more preferably 1-1.5 cm.
In the invention, the microorganisms in the activated sludge realize the immobilization of heavy metal ions in the acidic wastewater through a strong reducing environment generated by anaerobic reaction.
In the present invention, the mass ratio of the adjustment layer to the reduction layer is preferably 1: (5-10), more preferably 1: (6-9), most preferably 1: (7-8.5).
The pH value of the slag acidic wastewater is adjusted through the adjusting layer, and the heavy metal in the acidic wastewater is fixed through the synergistic effect of the adjusting layer and the reducing layer, so that the diffusion and migration of heavy metal pollutants are effectively fixed and limited for a long time, and the slag acidic wastewater is effectively treated.
In the invention, the construction process of the reduction barrier for treating the slag acid wastewater is preferably as follows: sequentially spreading the reduction layer raw material and the regulation layer raw material from bottom to top, and compacting to form a reduction layer and a regulation layer; and finally filling slag. In the present invention, the above construction process is preferably performed according to the technical specification of sanitary landfill anti-seepage system engineering (CJJ 113-2007).
The invention also provides application of the reduction barrier for treating the slag acidic wastewater in slag acidic wastewater pollution prevention.
In the present invention, the slag is preferably in contact with a regulating layer in a reduction barrier; the mass ratio of the slag to the reduction barrier is (1.7-5): 1, more preferably (2.5 to 4.5): 1: most preferably (3-4): 1.
according to the invention, after the acidic slag wastewater is produced, the acidic slag wastewater sequentially passes through the adjusting layer and the reducing layer under the action of self gravity, when the acidic slag wastewater passes through the adjusting layer, the pH value of the acidic wastewater is adjusted by the alkaline adsorption material contained in the adjusting layer, so that the pH value of the wastewater reaches the adaptation degree, and after the wastewater enters the reducing layer through the adjusting layer, the heavy metal ions in the acidic wastewater are fixed by the strong sulfate reduction environment generated by the microorganisms in the activated sludge in the reducing layer through an anaerobic reaction.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
According to the requirements of technical specification of anti-seepage system engineering of sanitary landfill of domestic garbage (CJJ113-2007) and the structure shown in figure 1, firstly, activated sludge with the water content of 20% in 100g of industrial sewage treatment plant is compacted to the thickness of 1cm to form a reduction layer, and the pH value and the heavy metal content of the activated sludge are measured and listed in Table 2;
then an adjusting layer is arranged on the reduction layer, the adjusting layer is made of fly ash with the particle size of 0.038mm, the mass of the fly ash is 21.8g, the compaction thickness is 1cm, and then 200g of slag of the mine lucsin copper ore tailing yard of Bayan Yan Er city is placed on the adjusting layer.
The pH value and the heavy metal content of the wastewater generated by washing the Bayan Tenglang Yuxin copper mine tailing yard with deionized water before treatment are shown in Table 1, and the pH value and the heavy metal content of the wastewater after reduction barrier treatment are shown in Table 3.
Watch 1 Bayan Yan Lu Er city Yuxin mine tailing yard acid waste water
TABLE 2 pH and heavy metal content of activated sludge
Example 2
According to the requirements of the technical specification of the anti-seepage system engineering of the sanitary landfill of the domestic garbage (CJJ113-2007) and the structure shown in figure 1, firstly, 100g of activated sludge with the water content of 20% in an industrial sewage treatment plant is compacted to the thickness of 1.5cm to form a reduction layer, and the pH value and the heavy metal content of the activated sludge are measured and listed in Table 2;
then an adjusting layer is arranged on the reduction layer, the adjusting layer is made of fly ash with the particle size of 0.038mm, the mass of the fly ash is 21.8g, the compaction thickness is 1cm, and then 200g of slag of the mine lucsin copper ore tailing yard of Bayan Yan Er city is placed on the adjusting layer.
The pH value and the heavy metal content of the wastewater generated by washing the Bayan Tenglang Yuxin copper mine tailing yard with deionized water before treatment are shown in Table 1, and the pH value and the heavy metal content of the wastewater after reduction barrier treatment are shown in Table 3.
Example 3
According to the requirements of technical specification of anti-seepage system engineering of sanitary landfill of domestic garbage (CJJ113-2007) and the structure shown in figure 1, firstly, activated sludge with the water content of 20% in 100g of industrial sewage treatment plant is compacted to the thickness of 2cm to form a reduction layer, and the pH value and the heavy metal content of the activated sludge are measured and listed in Table 2;
then an adjusting layer is arranged on the reduction layer, the adjusting layer is made of fly ash with the particle size of 0.038mm, the mass of the fly ash is 21.8g, the compaction thickness is 1cm, and then 200g of slag of the mine lucsin copper ore tailing yard of Bayan Yan Er city is placed on the adjusting layer.
The pH value and the heavy metal content of the wastewater generated by washing the Bayan Tenglang Yuxin copper mine tailing yard with deionized water before treatment are shown in Table 1, and the pH value and the heavy metal content of the wastewater after reduction barrier treatment are shown in Table 3.
Table 3 shows the pH and heavy metal content of the acidic wastewater from slag treated by the reduction barrier provided in examples 1 to 3, and in order to more visually show the removal effect of heavy metal ions in examples 1 to 3, FIG. 2 shows the removal effect of copper and zinc in examples 1 to 3; as can be seen from table 3 and fig. 2, after the reducing barrier provided by the present invention is neutralized by the adjusting layer, the wastewater enters the reducing layer, and the sludge reducing barrier in this state not only removes heavy metal ions by its own adsorption action, but also is in a deep reduction state, wherein a large amount of anaerobic microorganisms exist and a strong sulfate reduction reaction occurs, so that heavy metal ions in the slag acidic wastewater can be more effectively immobilized. The slag acid wastewater treated by the reduction barrier constructed in the embodiments 1 to 3 of the present invention has a better treatment effect when the compacted thickness is lower, and the fixing effect on heavy metal ions can almost reach 100%, so that the water quality finally permeating into soil and groundwater can reach the water quality of class II water.
TABLE 3 detection of pH and heavy metal content of wastewater after reduction barrier treatment
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The reduction barrier for treating the slag acid wastewater is characterized by comprising a regulating layer and a reduction layer which is arranged at the bottom of the regulating layer in a stacking manner;
the material of the regulating layer comprises an alkaline adsorbing material; the material of the reduction layer comprises activated sludge.
2. The reduction barrier for treating slag acidic wastewater of claim 1, wherein the basic adsorption material comprises one or more of fly ash, blast furnace slag, pozzolan, and coal gangue.
3. The reduction barrier for treating slag acid wastewater according to claim 1, wherein the adjustment layer has a compacted thickness of 0.5 to 1 cm.
4. A reduction barrier for treating acidic slag wastewater according to any one of claims 1 to 3, wherein the particle size of the alkaline adsorption material is 0.038 to 0.075 mm.
5. The reduction barrier for treating slag acid wastewater according to claim 1, wherein the compacted thickness of the reduction layer is 0.5 to 2 cm.
6. The reduction barrier for treating acidic slag wastewater according to claim 1 or 5, wherein the activated sludge has a water content of 20 to 40%.
7. The reduction barrier for treating slag acid wastewater according to claim 1, 3 or 5, wherein the mass ratio of the regulation layer to the reduction layer is 1: (5-10).
8. Use of the reduction barrier for treating slag acidic wastewater according to any one of claims 1 to 7 in the prevention of slag acidic wastewater pollution, wherein the slag is in contact with a regulation layer in the reduction barrier.
9. The use according to claim 8, wherein the mass ratio of slag to reduction barrier is (1.7-5): 1.
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Application publication date: 20210618 |