CN110510773B - Acidic mine water treatment system and method - Google Patents
Acidic mine water treatment system and method 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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- 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
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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
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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Abstract
The invention provides an acid mine water treatment system and method which can enhance the iron removal effect, reduce the occupied area and reduce the operation cost. An acid mine water treatment system comprises an up-flow neutralization reaction device, a neutralization clarification device and a sodium hydroxide adding device, wherein the up-flow neutralization reaction device and the sodium hydroxide adding device are respectively communicated with the neutralization clarification device through pipelines. The acidic mine water treatment system has the advantages of simple flow, small occupied area, reaction time shortening, alkali agent adding amount reduction, convenience in operation and management, and effective saving of operation cost while ensuring stable effluent quality; the upflow neutralization reaction device occupies small area and does not need frequent material changing; the neutralization and clarification device integrates multiple functions of precipitation, filtration, adsorption and the like, does not need mechanical stirring equipment, has low energy consumption, and can strengthen the iron removal and mud-water separation effects.
Description
Technical Field
The invention relates to a water treatment system and method, in particular to an acidic mine water treatment system and method, and belongs to the technical field of water treatment.
Background
High sulfur coal seam mining processFeS in medium and medium coal2A series of physicochemical and biochemical reactions occur to make the mine water acidic. If the acidic mine water is not properly treated, the surface water environment can be directly damaged by discharging, and equipment or pipelines can be corroded and scaled when the acidic mine water is reused for production. At present, the main methods for removing iron from acid mine water comprise a neutralization method, a contact oxidation filtration method and a microbiological method.
The neutralization method is most widely applied, the iron removal effect is stable, but the alkaline agent dosage is large, the sludge yield is high, the operation management is complex, and the treatment cost is high. The contact oxidation filtration process has high construction and operation cost and limited iron removal effect. The microbiological method has low operation cost and no secondary pollution, but the effluent stability needs to be improved.
The discharge standard of pollutants for the coal industry (GB 20426-2006) requires that the total iron of the effluent of a water treatment station of a newly-built coal mine is less than or equal to 6 mg/L. And most coal mines in western regions of China are in severe water shortage regions, the water receiving bodies are limited, the total iron content of part of acid mine water of the coal mines is high, and the emission concentration of the total iron needs to meet the requirements of class III (standard limit value of 0.3 mg/L) of surface water environmental quality standard (GB 3838-2002). The treatment effect is improved on the premise of not increasing the economic burden of coal mine enterprises, and the development of an economic and reasonable process system is a key problem to be solved in the field of acidic mine water treatment.
Therefore, how to provide a system and a method for treating acidic mine water to shorten the reaction time, reduce the dosage of alkaline agents and reduce the operation cost is a technical problem to be solved in the field at present.
Disclosure of Invention
The invention aims to provide an acid mine water treatment system which can enhance the iron removal effect, reduce the occupied area and reduce the operation cost, and solves the problems in the background technology.
The invention also aims to provide an acid mine water treatment method, which improves the acid mine water treatment effect while reducing the operation management intensity.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an acid mine water treatment system comprises an up-flow neutralization reaction device, a neutralization clarification device and a sodium hydroxide adding device, wherein the up-flow neutralization reaction device and the sodium hydroxide adding device are respectively communicated with the neutralization clarification device through pipelines;
the upflow neutralization reaction device comprises an upflow neutralization reaction device shell, a bearing layer and a filtering reaction layer which are sequentially arranged in the upflow neutralization reaction device shell from bottom to top, wherein the bearing layer and the filtering reaction layer divide the interior of the upflow neutralization reaction device shell into a water inlet area, a fluidization reaction area and a deceleration separation area from bottom to top;
the neutralization and clarification device comprises a neutralization and clarification device shell, a guide cylinder and an adsorption filter layer, wherein the guide cylinder is arranged in the middle of an inner cavity of the neutralization and clarification device shell;
the sodium hydroxide feeding device comprises a medicine storage box, a medicine feeding pipe and a metering pump, the medicine storage box is communicated with the neutralization reaction zone of the neutralization clarification device through the medicine feeding pipe, and the metering pump is arranged on the medicine feeding pipe;
and a buffer water tank and a pipeline booster pump are sequentially arranged between the upflow neutralization reaction device and the neutralization clarification device, and the buffer water tank and the pipeline booster pump are communicated with the upflow neutralization reaction device and the neutralization clarification device through pipelines.
Preferably, the upflow neutralization reaction device further comprises a water inlet pipe, a water collecting tank A, a water outlet pipe A and an access hole, wherein the water inlet pipe is arranged at the bottom of the upflow neutralization reaction device shell, a water distributor is arranged at the top end of the water inlet pipe, the water collecting tank A is arranged at the upper part of the upflow neutralization reaction device shell, the water collecting tank A is communicated with a buffer water tank through the water outlet pipe A, and the access hole is arranged on the outer wall of the upflow neutralization reaction device shell corresponding to the fluidization reaction zone.
Preferably, the neutralization and clarification device further comprises a drooping type automatic rotating spray head, a water collecting tank B, a water outlet pipe B, a sludge collecting hopper and a sludge discharge pipe, wherein the drooping type automatic rotating spray head is arranged at the bottom of the guide shell, the water collecting tank B is arranged at the upper part of the neutralization and clarification device shell and communicated with the water outlet pipe B, and the sludge collecting hopper is arranged at the bottom of the neutralization and clarification device shell and communicated with the sludge discharge pipe.
Preferably, the volume ratio of the fluidization reaction zone to the filtering reaction layer is 1: 0.2-0.4, the volume ratio of the filtering reaction layer to the deceleration separation zone is 1: 1.2-1.5, the filling rate of the limestone filter material A in the fluidization reaction zone is 40% -60%, and the filling rate of the limestone filter material B in the filtering reaction zone is 40% -60%.
Preferably, the particle size of the limestone filter material A is 0.5-2 mm, the particle size of the limestone filter material B is 35-40 mm, the aperture of the lower grid plate is 25mm, and the aperture of the upper grid plate is 25 mm.
Preferably, pebbles are arranged in the bearing layer, and the particle diameter of the pebbles is 20-30 mm.
Preferably, the trapping filter material is a polyvinyl alcohol porous elastic sphere with the pore diameter of 0.8-2.5 mm, and the filling rate of the trapping filter material in the adsorption filter layer is 55-65%.
A method for performing acidic mine water treatment by using the acidic mine water treatment system comprises the following steps:
(1) starting the upflow neutralization reaction device to enable the acidic mine water to flow into the device and flow through the water inlet zone, the bearing layer, the fluidization reaction zone, the filtration reaction layer and the deceleration separation zone from bottom to top in sequence; the limestone filter material A in the fluidization reaction zone and the limestone filter material B in the filtering reaction layer can both carry out neutralization reaction with the acidic mine water, and the reacted limestone filter material B can be separated from the filtering reaction layer for fluidization after the particle size of the limestone filter material B is smaller than the pore size of the upper grid plate and the lower grid plate; the limestone filter material A and the limestone filter material B move upwards under the action of the ascending water flow and the carbon dioxide air flow, and gradually recover to subside in the ascending process, and the filtering reaction layer has the function of intercepting the limestone filter material A; controlling the water flow speed of the deceleration separation area to be 30-50 m/h, and collecting and filtering supernatant fluid and flowing the supernatant fluid into a buffer water pool through a pipeline;
(2) starting a sodium hydroxide feeding device and a pipeline booster pump, enabling the effluent of a buffer water tank to enter a neutralization and clarification device, enabling the effluent to perform neutralization reaction with sodium hydroxide flowing into the neutralization and clarification device through a dosing pipe, controlling the pH to be 6.5-7.5 through a metering pump and a pH online monitoring device, enabling mine water to enter a mud-water separation zone through a guide cylinder, enabling the supernatant to pass through an adsorption filter layer, enabling a trapping filter material to move under the action of water flow and air flow to trap and adsorb suspended matters, and enabling the filtrate to flow out through a pipeline;
(3) when the liquid level of the buffer water tank rises 100-200 mm higher than the initial liquid level, stopping water inflow of the upflow neutralization reaction device, closing a pipeline booster pump and a metering pump, starting an aeration hose in the neutralization clarification device, stopping aeration after continuously aerating for 10-30 minutes, standing and precipitating for 10-20 minutes, discharging precipitated sludge out of the neutralization clarification device, recovering the normal operation of the system, and repeating the step (1) and the step (2);
(4) when the pH value in the buffer water tank is less than or equal to 4.5, opening a perforated aeration pipe in the upflow neutralization reaction device to strengthen the neutralization reaction in the filtration reaction zone and promote the scaling and falling off of the surface of the limestone filter material B; and (3) if the pH value in the buffer water tank after the aeration is finished is less than or equal to 4.5, closing the system, and repeating the step (1) and the step (2) after the limestone filter material A and the limestone filter material B in the up-flow neutralization reaction device are replaced and filled.
The invention has the beneficial effects that:
(1) the acidic mine water treatment system has the advantages of simple flow, small occupied area, reaction time shortening, alkali agent adding amount reduction, convenience in operation and management, and effective saving of operation cost while ensuring stable effluent quality;
(2) the upflow neutralization reaction device in the acidic mine water treatment system has small floor area and does not need frequent material changing;
(3) the neutralization and clarification device in the acid mine water treatment system integrates multiple functions of precipitation, filtration, adsorption and the like, does not need mechanical stirring equipment, has low energy consumption, and can strengthen the effects of iron removal and mud-water separation.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the system architecture of the present invention.
In the figure: 1. An upflow neutralization reaction device, 10, an upflow neutralization reaction device shell, 11, a water inlet area, 111, a water inlet pipe, 112, a water distributor, 12, a supporting layer, 121, pebbles, 13, a fluidized reaction area, 1311, a limestone filter material A, 1312, a manhole, 14, a filtering reaction layer, 141, a limestone filter material B, 142, a lower grid plate, 143, an upper grid plate, 144, a perforated aeration pipe, 15, a deceleration separation area, 16, a water collecting tank A, 17, a water outlet pipe A, 18, a buffer water tank, 19, a pipeline booster pump, 2, a neutralization and clarification device, 20, a neutralization and clarification device shell, 21, a pendent automatic rotary spray head, 211, pH online monitoring, 22, a neutralization reaction area, 221, a guide cylinder, 23, a muddy water separation area, 24, an adsorption and filtration layer, 241, a trapping filter material, 242, an aeration hose, 243, a lower interception net, 244 and an upper interception net, 25. water collecting tanks B and 26, water outlet pipes B and 27, sludge collecting hoppers 28, sludge discharge pipes 3, a sodium hydroxide feeding device 31, a medicine storage tank 32, a medicine feeding pipe 33 and a metering pump.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components or devices in the following examples are, unless otherwise specified, standard parts or parts known to those skilled in the art, the structure and principle of which are known to those skilled in the art through technical manuals or through routine experimentation.
Example 1
The acid mine water treatment system shown in figure 1 comprises an up-flow neutralization reaction device 1, a neutralization and clarification device 2 and a sodium hydroxide adding device 3, wherein the up-flow neutralization reaction device and the sodium hydroxide adding device are respectively communicated with the neutralization and clarification device through pipelines.
The upflow neutralization reaction device comprises an upflow neutralization reaction device shell 10, and a supporting layer 12 and a filtering reaction layer 14 which are sequentially arranged in the upflow neutralization reaction device shell from bottom to top, wherein the supporting layer and the filtering reaction layer divide the interior of the upflow neutralization reaction device shell into a water inlet area 11, a fluidization reaction area 13 and a deceleration separation area 15 from bottom to top.
An inlet pipe 111 and a water distributor 112 are arranged in the inlet area, and the water distributor is arranged at the top end of the inlet pipe and is used for distributing the acid mine water flowing in through the inlet pipe to the bottom of the inlet area. Pebbles 121 are arranged in the supporting layer. A limestone filter material A1311 is arranged in the fluidization reaction zone. The filtering reaction layer comprises an upper grid plate 143 arranged at the top of the filtering reaction layer, a lower grid plate 142 arranged at the bottom of the filtering reaction layer and a limestone filter material B141 arranged between the upper grid plate and the lower grid plate, the particle size of the limestone filter material B is larger than the pore size of the upper grid plate and the pore size of the lower grid plate, and the lower grid plate is provided with a perforated aeration pipe 144 fixedly connected with the lower grid plate.
The upflow neutralization reaction device also comprises a water collecting tank A16, a water outlet pipe A17 and a manhole 1312. The water collecting tank A is arranged on the upper part of the shell of the up-flow neutralization reaction device and is communicated with the buffer pool through the water outlet pipe A. The access hole is arranged on the outer wall of the shell of the upflow type neutralization reaction device corresponding to the fluidized reaction zone, so that the shutdown maintenance is convenient.
The neutralization and clarification device comprises a neutralization and clarification device shell 20, a pendent type automatic rotary spray head 21, a guide cylinder 221, an adsorption and filtration layer 24, a water collecting tank B25, a water outlet pipe B26, a mud collecting hopper 27 and a mud discharging pipe 28. The droop type automatic rotating nozzle is arranged at the bottom of the guide shell, the guide shell is arranged in the middle of the inner cavity of the neutralization clarification device shell, the adsorption filter layer surrounds the outer part of the guide shell and is fixedly connected with the inner wall of the neutralization clarification device shell, and the adsorption filter layer is internally provided with a trapping filter material 241 and an aeration hose 242. The guide shell divides the interior of the neutralization and clarification device shell into a neutralization reaction area 22 and a mud-water separation area 23, the neutralization reaction area is arranged in the guide shell, the mud-water separation area is arranged outside the guide shell, and the neutralization reaction area is provided with a pH on-line monitoring device 211. A lower interception net 243 and an upper interception net 244 are arranged in the adsorption filtration layer and used for limiting the range of the area, and the two interception nets are obliquely arranged and opposite in position. The water collecting tank B is arranged at the upper part of the neutralization and clarification device shell and communicated with the water outlet pipe B, and the sludge collecting hopper is arranged at the bottom of the neutralization and clarification device shell and communicated with the sludge discharge pipe.
The sodium hydroxide feeding device comprises a medicine storage box 31, a medicine feeding pipe 32 and a metering pump 33, the medicine storage box is communicated with the neutralization reaction area of the neutralization clarification device through the medicine feeding pipe, and the metering pump is arranged on the medicine feeding pipe. Be equipped with buffering pond 18 and pipeline booster pump 19 between STREAMING neutralization reaction device and the neutralization clarification device in proper order, buffering pond and pipeline booster pump pass through pipeline intercommunication STREAMING neutralization reaction device and neutralization clarification device, specifically, outlet pipe A communicates water catch bowl A and buffering pond, and the pipeline booster pump will cushion the pond and hang down formula autogiration shower nozzle intercommunication.
In this embodiment, the volume ratio of the fluidization reaction zone to the filtration reaction zone is 1:0.2, the volume ratio of the filtration reaction zone to the deceleration separation zone is 1:1.2, the filling rate of the limestone filter material a in the fluidization reaction zone is 40%, and the filling rate of the limestone filter material B in the filtration reaction zone is 60%.
The particle size of the limestone filter material A is 0.5-2 mm, the particle size of the limestone filter material B is 35-40 mm, the aperture of the lower grid plate is 25mm, and the aperture of the upper grid plate is 25 mm. Pebbles are arranged in the supporting layer, and the particle size of the pebbles is 20-30 mm. The trapping filter material is a polyvinyl alcohol porous elastic sphere with the aperture of 0.8-2.5 mm, and the filling rate of the trapping filter material in the adsorption filter layer is 55%.
A method for carrying out acidic mine water treatment by adopting the acidic mine water treatment system comprises the following steps:
(1) starting the upflow neutralization reaction device to enable the acidic mine water to flow into the device and flow through the water inlet zone, the bearing layer, the fluidization reaction zone, the filtration reaction layer and the deceleration separation zone from bottom to top in sequence; the limestone filter material A in the fluidization reaction zone and the limestone filter material B in the filtering reaction layer can both carry out neutralization reaction with the acidic mine water, and the reacted limestone filter material B can be separated from the filtering reaction layer for fluidization after the particle size of the limestone filter material B is smaller than the pore size of the upper grid plate and the lower grid plate; the limestone filter material A and the limestone filter material B move upwards under the action of the ascending water flow and the carbon dioxide air flow, and gradually recover to subside in the ascending process, and the filtering reaction layer has the function of intercepting the limestone filter material A; controlling the water flow speed of the deceleration separation zone at 30-50 m/h, collecting the neutralization filtration supernatant into a water collecting tank A, and then flowing into a buffer water tank through a water outlet pipe A;
(2) starting a sodium hydroxide feeding device and a pipeline booster pump, enabling the effluent of a buffer water tank to enter a neutralization and clarification device, enabling the effluent to perform neutralization reaction with sodium hydroxide flowing into the neutralization and clarification device through a dosing pipe, controlling the pH to be 6.89-7.37 through a metering pump and a pH online monitoring device, enabling mine water to enter a mud-water separation zone through a guide cylinder, enabling supernatant to pass through an adsorption filter layer, enabling a trapping filter material to move and trap adsorbed suspended matters under the action of water flow and air flow, enabling the filtrate to enter a water outlet pipe B through a water collecting tank B, and discharging the filtrate out of a system through the water outlet pipe B;
(3) when the liquid level of the buffer water tank rises 100-200 mm higher than the initial liquid level, stopping water inflow of the upflow neutralization reaction device, closing a pipeline booster pump and a metering pump, starting an aeration hose in the neutralization clarification device, stopping aeration after continuously aerating for 10-30 minutes, standing and precipitating for 10-20 minutes, opening a sludge discharge pipe, discharging precipitated sludge out of the neutralization clarification device, recovering the normal operation of the system, and repeating the step (1) and the step (2);
(4) when the pH value in the buffer water tank is less than or equal to 4.5, opening a perforated aeration pipe in the upflow neutralization reaction device to strengthen the neutralization reaction in the filtration reaction zone and promote the scaling and falling off of the surface of the limestone filter material B; and (3) if the pH value in the buffer water tank after the aeration is finished is less than or equal to 4.5, closing the system, and repeating the step (1) and the step (2) after the limestone filter material A and the limestone filter material B in the up-flow neutralization reaction device are replaced and filled.
Under the condition that the total hydraulic retention time is 2.19 hours, pilot test water is mine water of a certain coal mine main well, water quality monitoring data of 13 days of continuous operation by adopting the system and the method of the embodiment is shown in table 1, and the adding cost of medicaments such as limestone filter materials A, limestone filter materials B, sodium hydroxide and the like is 0.13 yuan/ton of water.
Water quality monitoring data during test runs in Table 1
| Index of water quality | System water intake | Effluent of upflow neutralization reaction device | The effluent of the neutralization and clarification device |
| pH | 2.97-3.43 | 5.13~5.46 | 6.65~7.31 |
| Total iron/(mg. L)-1) | 392~434 | 28.5~46.3 | 0.03~0.15 |
Example 2
The technical scheme of the acidic mine water treatment system shown in fig. 1 is the same as that of the embodiment 1, and is different from that of the acidic mine water treatment system shown in the embodiment 1 in that: the volume ratio of the fluidization reaction zone to the filtration reaction zone is 1: 0.4, the volume ratio of the filtration reaction zone to the deceleration separation zone is 1: 1.5, the filling rate of the limestone filter material A in the fluidization reaction zone is 60%, and the filling rate of the limestone filter material B in the filtration reaction zone is 40%.
The particle size of the limestone filter material A is 0.5-2 mm, the particle size of the limestone filter material B is 35-40 mm, the aperture of the lower grid plate is 25mm, and the aperture of the upper grid plate is 25 mm. Pebbles are arranged in the supporting layer, and the particle size of the pebbles is 20-30 mm. The trapping filter material is a polyvinyl alcohol porous elastic sphere with the aperture of 0.8-2.5 mm, and the filling rate of the trapping filter material in the adsorption filter layer is 65%.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (6)
1. A method for treating acidic mine water by using an acidic mine water treatment system is characterized by comprising the following steps: the method comprises the following steps of,
(1) starting the upflow neutralization reaction device to enable the acidic mine water to flow into the device and flow through the water inlet zone, the bearing layer, the fluidization reaction zone, the filtration reaction layer and the deceleration separation zone from bottom to top in sequence; the limestone filter material A in the fluidization reaction zone and the limestone filter material B in the filtering reaction layer can both carry out neutralization reaction with the acidic mine water, and the reacted limestone filter material B can be separated from the filtering reaction layer for fluidization after the particle size of the limestone filter material B is smaller than the pore size of the upper grid plate and the lower grid plate; the limestone filter material A and the limestone filter material B move upwards under the action of the ascending water flow and the carbon dioxide air flow, and gradually recover to subside in the ascending process, and the filtering reaction layer has the function of intercepting the limestone filter material A; controlling the water flow speed of the deceleration separation area to be 30-50 m/h, and collecting and filtering supernatant fluid and flowing the supernatant fluid into a buffer water pool through a pipeline;
(2) starting a sodium hydroxide feeding device and a pipeline booster pump, enabling the effluent of a buffer water tank to enter a neutralization and clarification device, enabling the effluent to perform neutralization reaction with sodium hydroxide flowing into the neutralization and clarification device through a dosing pipe, controlling the pH to be 6.5-7.5 through a metering pump and a pH online monitoring device, enabling mine water to enter a mud-water separation zone through a guide cylinder, enabling the supernatant to pass through an adsorption filter layer, enabling a trapping filter material to move under the action of water flow and air flow to trap and adsorb suspended matters, and enabling the filtrate to flow out through a pipeline;
(3) when the liquid level of the buffer water tank rises 100-200 mm higher than the initial liquid level, stopping water inflow of the upflow neutralization reaction device, closing a pipeline booster pump and a metering pump, starting an aeration hose in the neutralization clarification device, stopping aeration after continuously aerating for 10-30 minutes, standing and precipitating for 10-20 minutes, discharging precipitated sludge out of the neutralization clarification device, recovering the normal operation of the system, and repeating the step (1) and the step (2);
(4) when the pH value in the buffer water tank is less than or equal to 4.5, opening a perforated aeration pipe in the upflow neutralization reaction device to strengthen the neutralization reaction in the filtration reaction zone and promote the scaling and falling off of the surface of the limestone filter material B; if the pH value in the buffer water tank after aeration is finished is less than or equal to 4.5, closing the system, and repeating the step (1) and the step (2) after the limestone filter material A and the limestone filter material B in the up-flow neutralization reaction device are replaced and filled;
the acid mine water treatment system comprises an up-flow neutralization reaction device, a neutralization clarification device and a sodium hydroxide adding device, wherein the up-flow neutralization reaction device and the sodium hydroxide adding device are respectively communicated with the neutralization clarification device through pipelines; the upflow neutralization reaction device comprises an upflow neutralization reaction device shell, a bearing layer and a filtering reaction layer which are sequentially arranged in the upflow neutralization reaction device shell from bottom to top, wherein the bearing layer and the filtering reaction layer divide the interior of the upflow neutralization reaction device shell into a water inlet area, a fluidization reaction area and a deceleration separation area from bottom to top; the neutralization and clarification device comprises a neutralization and clarification device shell, a guide cylinder and an adsorption filter layer, wherein the guide cylinder is arranged in the middle of an inner cavity of the neutralization and clarification device shell; the sodium hydroxide feeding device comprises a medicine storage box, a medicine feeding pipe and a metering pump, the medicine storage box is communicated with the neutralization reaction zone of the neutralization clarification device through the medicine feeding pipe, and the metering pump is arranged on the medicine feeding pipe; a buffer water tank and a pipeline booster pump are sequentially arranged between the upflow neutralization reaction device and the neutralization clarification device, and the buffer water tank and the pipeline booster pump are communicated with the upflow neutralization reaction device and the neutralization clarification device through pipelines;
the neutralization clarification device also comprises a drooping type automatic rotating spray head, a water collecting tank B, a water outlet pipe B, a sludge collecting hopper and a sludge discharge pipe, wherein the drooping type automatic rotating spray head is arranged at the bottom of the guide shell, the water collecting tank B is arranged at the upper part of the neutralization clarification device shell and communicated with the water outlet pipe B, and the sludge collecting hopper is arranged at the bottom of the neutralization clarification device shell and communicated with the sludge discharge pipe.
2. The method of claim 1, wherein: the upflow neutralization reaction device further comprises a water inlet pipe, a water collecting tank A, a water outlet pipe A and an access hole, wherein the water inlet pipe is arranged at the bottom of the upflow neutralization reaction device shell, a water distributor is arranged at the top end of the water inlet pipe, the water collecting tank A is arranged at the upper part of the upflow neutralization reaction device shell, the water collecting tank A is communicated with a buffer pool through the water outlet pipe A, and the access hole is arranged on the outer wall of the upflow neutralization reaction device shell corresponding to the fluidization reaction zone.
3. The method of claim 1, wherein: the volume ratio of the fluidization reaction zone to the filtering reaction layer is 1: 0.2-0.4, the volume ratio of the filtering reaction layer to the deceleration separation zone is 1: 1.2-1.5, the filling rate of the limestone filter material A in the fluidization reaction zone is 40% -60%, and the filling rate of the limestone filter material B in the filtering reaction zone is 40% -60%.
4. The method of claim 1, wherein: the particle size of the limestone filter material A is 0.5-2 mm, the particle size of the limestone filter material B is 35-40 mm, the aperture of the lower grid plate is 25mm, and the aperture of the upper grid plate is 25 mm.
5. The method of claim 1, wherein: pebbles are arranged in the bearing layer, and the particle size of the pebbles is 20-30 mm.
6. The method of claim 1, wherein: the trapping filter material is a polyvinyl alcohol porous elastic sphere with the aperture of 0.8-2.5 mm, and the filling rate of the trapping filter material in the adsorption filter layer is 55-65%.
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| CN111392922A (en) * | 2020-05-18 | 2020-07-10 | 范誉委 | Coal washing wastewater and mine wastewater comprehensive treatment system |
| CN112079425A (en) * | 2020-09-05 | 2020-12-15 | 浙江联池水务设备股份有限公司 | PH physicochemical adjusting device for drinking water |
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