CN111186929A - Defluorination and denitrification coupling treatment system and treatment method for mine water - Google Patents

Defluorination and denitrification coupling treatment system and treatment method for mine water Download PDF

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CN111186929A
CN111186929A CN201910111633.2A CN201910111633A CN111186929A CN 111186929 A CN111186929 A CN 111186929A CN 201910111633 A CN201910111633 A CN 201910111633A CN 111186929 A CN111186929 A CN 111186929A
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water
tank
ion exchanger
resin
communicated
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潘文刚
刘艳梅
乔宇
金鑫
陈强
孙树青
张帅
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Inner Mongolia Jingtai Environmental Science And Technology Co Ltd
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Inner Mongolia Jingtai Environmental Science And Technology Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D9/00—Nitrates of sodium, potassium or alkali metals in general
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
    • 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
    • C02F2101/12—Halogens or halogen-containing compounds
    • C02F2101/14—Fluorine or fluorine-containing compounds
    • 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
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02—Softening water by precipitation of the hardness

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Agronomy & Crop Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention discloses a defluorination and denitrification coupling treatment system for mine water, which comprises a raw water tank, a high-efficiency sedimentation tank, a sand filtration device, a security filter, a first ion exchanger, a second ion exchanger, a resin water production tank, an activated carbon adsorption device, a clean water tank, a chemical sedimentation tank, a sludge treatment unit, an evaporative crystallization system, a miscellaneous salt drying system and a regeneration liquid tank, wherein the system can realize the standard discharge of the mine water and can protect the environment; the invention also discloses a defluorination and denitrification coupling treatment method for mine water, which comprises the following steps: pretreating in the first process, filtering in the second process, removing fluorine by resin in the third process, removing nitrate by resin in the fourth process, and adsorbing by active carbon in the fifth process; the invention has the advantages of safety, reliability, stable operation and lower operation cost, avoids the damage to the environment caused by the discharge of fluorine and nitrate radical in the mine water, has great social benefit, realizes the recovery of salt in the mine water, and reduces the operation cost of the enterprise for treating the mine water.

Description

Defluorination and denitrification coupling treatment system and treatment method for mine water
The technical field is as follows:
the invention relates to the technical field of wastewater treatment, in particular to a defluorination and denitrification coupling treatment system and a treatment method for mine water.
Background art:
the mine water generally refers to all water permeating into an underground mining space in the coal mining process, a large amount of mine water is discharged, the components of the mine water are influenced by factors such as geological age, geological structure, coal-series associated mineral components, environmental conditions and the like, pollutants in the mine water comprise organic pollutants, oil pollutants, acid and alkali pollutants, fluorides, soluble salts and the like (such as chlorides, nitrates and the like), if the fluorine is directly discharged, the environment of a mining area is polluted, the health and the balance of natural ecology of people are influenced, the fluorine poisoning is caused by the excessive intake of the fluorine element by a human body, nitrate can be reduced into nitrite in a human body, on one hand, the nitrite can react with hemoglobin to generate methemoglobin, so that the oxygen transmission capability is influenced, and particularly for infants, methemoglobinemia (blue infant disease) is easy to cause; on the other hand, the nitrite is too high, and the nitrite can generate nitrosamine with protein, which belongs to a strong carcinogen and has great harm to health, so that the mining area should pay attention to the treatment of the mine water.
In addition, most areas in China face water resource shortage, and most abundant coal resources in China are distributed in the areas with insufficient water resources, so that water resources in coal mines are urgently treated and utilized reasonably in order to protect the environment, save the cost and meet the water demand of coal mine enterprises.
Research shows that mine water is only treated by simple treatment technologies such as precipitation, filtration, biochemical treatment and the like and then discharged in the prior mine enterprises, and the treatment effect is poor if biological nitrogen removal treatment is directly carried out on the mine water because the concentration of total nitrogen (the total nitrogen in most mine water mainly exists in a nitrate form) in the mine water is low; in addition, fluorine in the mine water treated by adopting the traditional chemical precipitation method cannot be effectively removed, so that the content of fluorine and total nitrogen in the treated mine water cannot reach the emission standard lower than 1 mg/L.
The invention content is as follows:
the invention aims to provide a coupled treatment system for removing fluorine and nitrogen from mine water, which has a simple process and is easy to realize.
The second purpose of the invention is to provide a safe and reliable defluorination and denitrification coupling treatment method for mine water with high treatment efficiency.
The first purpose of the invention is implemented by the following technical scheme: a coupled treatment system for defluorination and denitrification of mine water comprises a raw water tank, a high-efficiency sedimentation tank, a sand filtration device, a security filter, a first ion exchanger, a second ion exchanger, a resin water production tank, an activated carbon adsorption device, a clean water tank, a chemical sedimentation tank, a sludge treatment unit, an evaporative crystallization system, a miscellaneous salt drying system and a regeneration liquid tank,
the water outlet of the raw water tank is communicated with the water inlet of the high-efficiency sedimentation tank, the water outlet of the high-efficiency sedimentation tank is communicated with the water inlet of the sand filtering device, the water outlet of the sand filtering device is communicated with the water inlet of the security filter, the water outlet of the security filter is communicated with the water inlet of the first ion exchanger, the water producing port of the first ion exchanger is communicated with the water inlet of the second ion exchanger, the water producing port of the second ion exchanger is communicated with the water inlet of the resin water producing tank, the water outlet of the resin water producing tank is communicated with the water inlet of the activated carbon adsorption device, and the water outlet of the activated carbon adsorption device is communicated with the water inlet of the clean water tank;
a liquid outlet of the regeneration liquid tank is communicated with a regeneration liquid inlet of the first ion exchanger, a regeneration waste liquid outlet of the first ion exchanger is communicated with a water inlet of the chemical sedimentation tank, and a water outlet of the chemical sedimentation tank is communicated with a water inlet of the evaporative crystallization system;
a liquid outlet of the regeneration liquid tank is communicated with a regeneration liquid inlet of the second ion exchanger, and a regeneration waste liquid outlet of the second ion exchanger is communicated with a water inlet of the evaporative crystallization system; a mother liquor outlet of the evaporative crystallization system is communicated with a liquid inlet of the miscellaneous salt drying system;
and the sludge outlets of the high-efficiency sedimentation tank and the chemical sedimentation tank are communicated with the inlet of the sludge treatment unit.
Furthermore, a discharge hole of the evaporative crystallization system is communicated with a feed inlet of the regeneration liquid tank.
The second purpose of the invention is implemented by the following technical scheme: a fluorine and nitrogen removal coupling treatment method for mine water comprises the following steps: step one, pretreatment; step two, security filtering; step three, fluorine removal by resin; the fourth step is to remove the nitre by resin; step five, activated carbon adsorption; wherein:
step one pretreatment: the pH value in the raw water pool is 7-9, the TDS is less than or equal to 2000mg/L, F-is 5-20 mg/L, and NO3Sending the high-salinity wastewater with the concentration of 5-20 mg/L and the COD of 20-50 mg/L into a high-efficiency sedimentation tank for hardness removal treatment, and obtaining Ca after sedimentation2+≤20mg/L、Mg2+Hard water and sludge are removed at the concentration of less than or equal to 1mg/L, the hard water is sent into a first sand filtration device for filtration treatment to remove suspended matters, and suspended matter removed water with SS less than or equal to 1mg/L is obtained;
and step two, security filtering: sending the suspended matter removed water obtained by sand filtration in the pretreatment in the first step into a security filter for filtration, wherein the filtration precision of solid suspended matter impurities is 5 microns, and obtaining filtered water;
and (3) fluorine removal of resin: sending the filtered water obtained in the second security filtration into a first ion exchanger, and adsorbing and removing fluorine by using fluorine-removing resin to obtain fluorine-removing water with the F-content of less than or equal to 1 mg/L;
and step four, nitrate removal by resin: the defluorination water obtained by the defluorination of the resin in the third procedure is sent to a second ion exchanger and is adsorbed by the denitration resinAfter treatment to remove nitrate radical, NO is obtained3Denitrified water with the concentration less than or equal to 1 mg/L;
and step five, activated carbon adsorption: and (3) feeding the denitrified water obtained by resin denitration in the step four into an active carbon adsorption device, and removing COD through active carbon adsorption treatment to obtain clear water with COD less than or equal to 20mg/L, F < - > less than or equal to 1mg/L and total nitrogen less than or equal to 1 mg/L.
Further, the regenerated waste liquid generated in the first ion exchanger for resin defluorination in the third procedure is sent into a chemical precipitation tank, calcium chloride is added for chemical precipitation defluorination treatment to obtain regenerated water with the F < - > less than or equal to 10mg/L, and the regenerated water is sent into an evaporative crystallization system for treatment to obtain sodium chloride crystals.
And further, sending the regeneration waste liquid generated by the second ion exchanger in the resin denitration in the step four to an evaporation crystallization system for treatment to obtain sodium chloride crystals.
Further, sodium chloride crystals generated in the evaporative crystallization system are recycled in the regeneration liquid tank to prepare regeneration liquid of the first ion exchanger and the second ion exchanger.
Further, mother liquor generated in the evaporative crystallization system is sent to a miscellaneous salt drying system for evaporative crystallization, and sodium nitrate crystals are obtained.
The invention has the advantages that: the invention provides a defluorination and denitrification coupling treatment system for mine water, which is characterized in that the mine water sequentially passes through a high-efficiency sedimentation tank, a sand filtration device and a security filter to reduce the hardness and SS of the water, then the mine water is sequentially sent into a first ion exchanger and a second ion exchanger to be treated, the contents of fluorine and nitrate radical in the mine water can be greatly reduced through two-stage resin treatment, the water after the resin treatment is sent into an active carbon adsorption device to remove COD (chemical oxygen demand) in waste water, finally the contents of fluorine and total nitrogen in the water in a clean water tank are both lower than 1mg/L and COD is lower than 15mg/L, the regenerated waste liquid generated by the first ion exchanger is subjected to chemical precipitation, the supernatant of the chemical precipitation tank and the regenerated waste liquid generated by the second ion exchanger are sequentially sent into an evaporative crystallization system and a miscellaneous salt drying system to be subjected to evaporative crystallization, and sodium chloride crystals and sodium nitrate crystals are respectively obtained, the sodium chloride crystal can be reused for preparing regeneration liquid of the first ion exchanger and the second ion exchanger, and the system can realize the standard discharge of mine water and protect the environment;
the invention also provides a defluorination and denitrification coupling treatment method for the mine water, which is safe and reliable, stable in operation and low in operation cost, avoids the damage of the discharge of fluorine and nitrate radicals in the mine water to the environment, has great social benefit, realizes the recovery of salt in the mine water, and reduces the operation cost of enterprises for treating the mine water.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic system diagram according to embodiment 1.
FIG. 2 is a process flow diagram corresponding to example 1.
Wherein: the system comprises a raw water tank 1, a high-efficiency sedimentation tank 2, a sand filtering device 3, a security filter 4, a first ion exchanger 5, a second ion exchanger 6, a resin water production tank 7, an activated carbon adsorption device 8, a clean water tank 9, a chemical sedimentation tank 10, a sludge treatment unit 11, an evaporative crystallization system 12, a mixed salt drying system 13 and a regeneration liquid tank 14.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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:
as shown in fig. 1-2, a coupled treatment system for defluorination and denitrification of mine water comprises a raw water tank 1, a high-efficiency sedimentation tank 2, a sand filtration device 3, a cartridge filter 4, a first ion exchanger 5, a second ion exchanger 6, a resin water production tank 7, an activated carbon adsorption device 8, a clean water tank 9, a chemical sedimentation tank 10, a sludge treatment unit 11, an evaporative crystallization system 12, a miscellaneous salt drying system 13, and a regeneration liquid tank 14;
the water outlet of the raw water tank 1 is communicated with the water inlet of the high-efficiency sedimentation tank 2, the water outlet of the high-efficiency sedimentation tank 2 is communicated with the water inlet of the sand filtering device 3, the water outlet of the sand filtering device 3 is communicated with the water inlet of the cartridge filter 4, the water outlet of the cartridge filter 4 is communicated with the water inlet of the first ion exchanger 5, the water producing port of the first ion exchanger 5 is communicated with the water inlet of the second ion exchanger 6, the water producing port of the second ion exchanger 6 is communicated with the water inlet of the resin water producing tank 7, the water outlet of the resin water producing tank 7 is communicated with the water inlet of the activated carbon adsorption device 8, and the water outlet of the activated carbon adsorption device 8 is communicated with the water inlet;
a liquid outlet of the regeneration liquid tank 14 is communicated with a regeneration liquid inlet of the first ion exchanger 5, a regeneration waste liquid outlet of the first ion exchanger 5 is communicated with a water inlet of the chemical sedimentation tank 10, a water outlet of the chemical sedimentation tank 10 is communicated with a water inlet of the evaporative crystallization system 12, and the evaporative crystallization system 12 is a single-effect evaporator;
a liquid outlet of the regeneration liquid tank 14 is communicated with a regeneration liquid inlet of the second ion exchanger 6, and a regeneration waste liquid outlet of the second ion exchanger 6 is communicated with a water inlet of the evaporative crystallization system 12; a mother liquor outlet of the evaporative crystallization system 12 is communicated with a liquid inlet of a mixed salt drying system 13, and the mixed salt drying system 13 is a single-effect evaporator;
the sludge outlets of the high-efficiency sedimentation tank 2 and the chemical sedimentation tank 10 are communicated with the inlet of the sludge treatment unit 11.
The discharge port of the evaporative crystallization system 12 is communicated with the feed port of the regeneration liquid box 14.
The first ion exchanger 5 is filled with a Tulsion A-CH-32 type defluorinating resin manufactured by Kaihsia (Beijing) science and technology Limited.
The second ion exchanger 6 is filled with a model Tulsion-A-62mp nitrate-removing resin manufactured by Kohaisi (Beijing) science and technology Limited.
Example 2:
the defluorination and denitrification coupling treatment method for mine water in the embodiment 1 comprises the following steps: step one, pretreatment; step two, security filtering; step three, fluorine removal by resin; the fourth step is to remove the nitre by resin; step five, activated carbon adsorption; wherein:
step one pretreatment: pH of the raw water pool 1 is 9, TDS is 2000mg/L, F is 20mg/L, NO is added3Sending the high-salinity wastewater with the concentration of-20 mg/L and the COD of 50mg/L into a high-efficiency sedimentation tank 2 for hardness removal, and obtaining Ca after sedimentation2+＝20mg/L、Mg2+1mg/L of hard water and sludge, and sending the hard water into a first sand filter device 3 for filtering treatment to remove suspended matters, so as to obtain water with SS equal to 1mg/L of suspended matters;
and step two, security filtering: delivering the suspended matter removed water obtained by sand filtration treatment in the pretreatment in the first step into a security filter 4 for filtration treatment, wherein the filtration precision of solid suspended matter impurities is 5 mu m, and obtaining filtered water;
and (3) fluorine removal of resin: sending the filtered water obtained in the second security filtration step into a first ion exchanger 5, and adsorbing and removing fluorine by using fluorine-removing resin to obtain fluorine-removed water with F < - > 1 mg/L;
and step four, nitrate removal by resin: the defluorination water obtained by the defluorination of the resin in the step three is sent to a second ion exchanger 6, nitrate radicals are removed by the adsorption treatment of the denitrified resin, and NO is obtained30.9mg/L of denitrified water;
and step five, activated carbon adsorption: the denitrified water obtained by denitrating the resin in the step four is sent to an activated carbon adsorption device 8, and after COD is removed by activated carbon adsorption treatment, clear water with COD of 20mg/L, F of 1mg/L and total nitrogen of 1mg/L is obtained.
Sending the regenerated waste liquid generated in the first resin defluorination ion exchanger 5 in the procedure III into a chemical precipitation tank 10, adding calcium chloride for chemical precipitation defluorination treatment to obtain regenerated water with F < - > 10mg/L, and sending the regenerated water into an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
And (3) sending the regenerated waste liquid generated by the second ion exchanger 6 in the resin denitration in the step four to an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
Sodium chloride crystals generated in the evaporative crystallization system 12 are recycled in the regeneration liquid tank 14 to prepare regeneration liquid of the first ion exchanger 5 and the second ion exchanger 6.
And (3) sending the mother liquor generated in the evaporative crystallization system 12 into a mixed salt drying system 13 for evaporative crystallization to obtain sodium nitrate crystals.
Example 3:
the defluorination and denitrification coupling treatment method for mine water in the embodiment 1 comprises the following steps: step one, pretreatment; step two, security filtering; step three, fluorine removal by resin; the fourth step is to remove the nitre by resin; step five, activated carbon adsorption; wherein:
step one pretreatment: adding pH 8, TDS 1900mg/L, F18 mg/L, and NO into raw water pool 13Sending the high-salinity wastewater with the concentration of 18mg/L and the COD of 45mg/L into a high-efficiency sedimentation tank 2 for hardness removal, and obtaining Ca after sedimentation2+＝18mg/L、Mg2+Feeding the hard water into a first sand filter device 3 for filtering to remove suspended matters so as to obtain suspended matter removed water with SS being 0.9 mg/L;
and step two, security filtering: delivering the suspended matter removed water obtained by sand filtration treatment in the pretreatment in the first step into a security filter 4 for filtration treatment, wherein the filtration precision of solid suspended matter impurities is 5 mu m, and obtaining filtered water;
and (3) fluorine removal of resin: sending the filtered water obtained in the second security filtration step into a first ion exchanger 5, and adsorbing and removing fluorine by using fluorine-removing resin to obtain fluorine-removed water with F-being 0.8 mg/L;
and step four, nitrate removal by resin: the defluorination water obtained by the defluorination of the resin in the step three is sent to a second ion exchanger 6, nitrate radicals are removed by the adsorption treatment of the denitrified resin, and NO is obtained30.7mg/L of denitrified water;
and step five, activated carbon adsorption: and (3) feeding the denitrified water obtained by denitrating the resin in the step four into an activated carbon adsorption device 8, and removing COD through activated carbon adsorption treatment to obtain clear water with COD (18 mg/L), F (0.8 mg/L) and total nitrogen (0.8 mg/L).
Sending the regenerated waste liquid generated in the first resin defluorination ion exchanger 5 in the procedure III into a chemical precipitation tank 10, adding calcium chloride for chemical precipitation defluorination treatment to obtain regenerated water with F < - > 9mg/L, and sending the regenerated water into an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
And (3) sending the regenerated waste liquid generated by the second ion exchanger 6 in the resin denitration in the step four to an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
Sodium chloride crystals generated in the evaporative crystallization system 12 are recycled in the regeneration liquid tank 14 to prepare regeneration liquid of the first ion exchanger 5 and the second ion exchanger 6.
And (3) sending the mother liquor generated in the evaporative crystallization system 12 into a mixed salt drying system 13 for evaporative crystallization to obtain sodium nitrate crystals.
Example 4:
the defluorination and denitrification coupling treatment method for mine water in the embodiment 1 comprises the following steps: step one, pretreatment; step two, security filtering; step three, fluorine removal by resin; the fourth step is to remove the nitre by resin; step five, activated carbon adsorption; wherein:
step one pretreatment: pH 7, TDS 1700mg/L, F14 mg/L and NO in the raw water pool 13High-salinity wastewater with the concentration of 14mg/L and the COD of 35mg/L is sent into a high-efficiency sedimentation tank 2 for hardness removal treatment, and Ca is obtained after sedimentation2+＝15mg/L、Mg2+Feeding the hard water into a first sand filter 3 for filtering to remove suspended matters so as to obtain suspended matter removed water with SS being 0.7 mg/L;
and step two, security filtering: delivering the suspended matter removed water obtained by sand filtration treatment in the pretreatment in the first step into a security filter 4 for filtration treatment, wherein the filtration precision of solid suspended matter impurities is 5 mu m, and obtaining filtered water;
and (3) fluorine removal of resin: sending the filtered water obtained in the second security filtration step into a first ion exchanger 5, and adsorbing and removing fluorine by using fluorine-removing resin to obtain fluorine-removed water with F-being 0.6 mg/L;
and step four, nitrate removal by resin: the defluorination water obtained by the defluorination of the resin in the step three is sent to a second ion exchanger 6, nitrate radicals are removed by the adsorption treatment of the denitrified resin, and NO is obtained30.6mg/L of denitrified water;
and step five, activated carbon adsorption: and (3) feeding the denitrified water obtained by denitrating the resin in the step four into an activated carbon adsorption device 8, and removing COD through activated carbon adsorption treatment to obtain clear water with COD (15 mg/L), F (0.6 mg/L) and total nitrogen (0.8 mg/L).
Sending the regenerated waste liquid generated in the first resin defluorination ion exchanger 5 in the procedure III into a chemical precipitation tank 10, adding calcium chloride for chemical precipitation defluorination treatment to obtain regenerated water with F < - > 0.7mg/L, and sending the regenerated water into an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
And (3) sending the regenerated waste liquid generated by the second ion exchanger 6 in the resin denitration in the step four to an evaporative crystallization system 12 for treatment to obtain sodium chloride crystals.
Sodium chloride crystals generated in the evaporative crystallization system 12 are recycled in the regeneration liquid tank 14 to prepare regeneration liquid of the first ion exchanger 5 and the second ion exchanger 6.
And (3) sending the mother liquor generated in the evaporative crystallization system 12 into a mixed salt drying system 13 for evaporative crystallization to obtain sodium nitrate crystals.

Claims (7)

1. A coupled treatment system for defluorination and denitrification of mine water is characterized by comprising a raw water tank, a high-efficiency sedimentation tank, a sand filtration device, a security filter, a first ion exchanger, a second ion exchanger, a resin water production tank, an activated carbon adsorption device, a clean water tank, a chemical sedimentation tank, a sludge treatment unit, an evaporative crystallization system, a miscellaneous salt drying system and a regeneration liquid tank,
the water outlet of the raw water tank is communicated with the water inlet of the high-efficiency sedimentation tank, the water outlet of the high-efficiency sedimentation tank is communicated with the water inlet of the sand filtering device, the water outlet of the sand filtering device is communicated with the water inlet of the security filter, the water outlet of the security filter is communicated with the water inlet of the first ion exchanger, the water producing port of the first ion exchanger is communicated with the water inlet of the second ion exchanger, the water producing port of the second ion exchanger is communicated with the water inlet of the resin water producing tank, the water outlet of the resin water producing tank is communicated with the water inlet of the activated carbon adsorption device, and the water outlet of the activated carbon adsorption device is communicated with the water inlet of the clean water tank;
a liquid outlet of the regeneration liquid tank is communicated with a regeneration liquid inlet of the first ion exchanger, a regeneration waste liquid outlet of the first ion exchanger is communicated with a water inlet of the chemical sedimentation tank, and a water outlet of the chemical sedimentation tank is communicated with a water inlet of the evaporative crystallization system;
a liquid outlet of the regeneration liquid tank is communicated with a regeneration liquid inlet of the second ion exchanger, and a regeneration waste liquid outlet of the second ion exchanger is communicated with a water inlet of the evaporative crystallization system; a mother liquor outlet of the evaporative crystallization system is communicated with a liquid inlet of the miscellaneous salt drying system;
and the sludge outlets of the high-efficiency sedimentation tank and the chemical sedimentation tank are communicated with the inlet of the sludge treatment unit.
2. The coupled treatment system for removing fluorine and nitrogen of mine water according to claim 1, wherein a discharge port of the evaporative crystallization system is communicated with a feed port of the regeneration liquid tank.
3. The method for treating mine water by using the coupled treatment system for removing fluorine and nitrogen from mine water as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps: step one, pretreatment; step two, security filtering; step three, fluorine removal by resin; the fourth step is to remove the nitre by resin; step five, activated carbon adsorption; wherein:
step one pretreatment: the pH value in the raw water pool is 7-9, the TDS is less than or equal to 2000mg/L, F-is 5-20 mg/L, and NO3Sending the high-salinity wastewater with the concentration of 5-20 mg/L and the COD of 20-50 mg/L into a high-efficiency sedimentation tank for hardness removal treatment, and obtaining Ca after sedimentation2+≤20mg/L、Mg2+Hard water and sludge are removed at the concentration of less than or equal to 1mg/L, the hard water is sent into a first sand filtration device for filtration treatment to remove suspended matters, and suspended matter removed water with SS less than or equal to 1mg/L is obtained;
and step two, security filtering: sending the suspended matter removed water obtained by sand filtration in the pretreatment in the first step into a security filter for filtration, wherein the filtration precision of solid suspended matter impurities is 5 microns, and obtaining filtered water;
and (3) fluorine removal of resin: sending the filtered water obtained in the second security filtration into a first ion exchanger, and adsorbing and removing fluorine by using fluorine-removing resin to obtain fluorine-removing water with the F-content of less than or equal to 1 mg/L;
and step four, nitrate removal by resin: the defluorination water obtained by the defluorination of the resin in the third procedure is sent to a second ion exchanger, nitrate radicals are removed by the adsorption treatment of the denitrified resin, and NO is obtained3Denitrified water with the concentration less than or equal to 1 mg/L;
and step five, activated carbon adsorption: and (3) feeding the denitrified water obtained by resin denitration in the step four into an active carbon adsorption device, and removing COD through active carbon adsorption treatment to obtain clear water with COD less than or equal to 20mg/L, F < - > less than or equal to 1mg/L and total nitrogen less than or equal to 1 mg/L.
4. The coupled treatment method for defluorination and denitrification of mine water as claimed in claim 3, wherein the regenerated waste liquid produced in the first ion exchanger for defluorination of resin in the third step is sent to a chemical precipitation tank, calcium chloride is added for chemical precipitation defluorination treatment to obtain regenerated water with F < -10 mg/L, and the regenerated water is sent to an evaporative crystallization system for treatment to obtain sodium chloride crystals.
5. The coupled treatment method for removing fluorine and nitrogen from mine water according to claim 3, wherein the regenerated waste liquid generated by the second ion exchanger in the four-resin denitration process is sent to an evaporative crystallization system for treatment to obtain sodium chloride crystals.
6. The coupled treatment method for removing fluorine and nitrogen from mine water according to claim 5, wherein sodium chloride crystals generated in the evaporative crystallization system are recycled in a regeneration liquid tank to prepare regeneration liquids of the first ion exchanger and the second ion exchanger.
7. The coupled treatment method for removing fluorine and nitrogen from mine water according to claim 5, wherein the mother liquor generated in the evaporative crystallization system is sent to a miscellaneous salt drying system for evaporative crystallization to obtain sodium nitrate crystals.
CN201910111633.2A 2019-02-12 2019-02-12 Defluorination and denitrification coupling treatment system and treatment method for mine water Withdrawn CN111186929A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115448511A (en) * 2022-10-25 2022-12-09 北京华德创业环保设备有限公司 Deep treatment method for non-film mine water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115448511A (en) * 2022-10-25 2022-12-09 北京华德创业环保设备有限公司 Deep treatment method for non-film mine water

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