CN212356743U - High-concentration industrial waste liquid treatment is with high-efficient device that removes hard - Google Patents
High-concentration industrial waste liquid treatment is with high-efficient device that removes hard Download PDFInfo
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- CN212356743U CN212356743U CN202020808751.7U CN202020808751U CN212356743U CN 212356743 U CN212356743 U CN 212356743U CN 202020808751 U CN202020808751 U CN 202020808751U CN 212356743 U CN212356743 U CN 212356743U
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Abstract
The utility model discloses a high-efficiency hardness removal device for treating high-concentration industrial waste liquid, which comprises a water inlet pipeline mixer, a dosing device, a water outlet pipeline mixer and a primary sedimentation separation tank; the medicine outlet of the medicine adding device is respectively connected with the medicine adding port of the water inlet pipeline mixer and the medicine adding port of the water outlet pipeline mixer; the outlet of the water inlet pipeline is connected with the water inlet of the water inlet pipeline mixer, the water outlet of the water inlet pipeline mixer is connected with the water inlet of the tank body of the primary sedimentation separation tank, the overflow water outlet of the primary sedimentation separation tank is connected with the water inlet of the water outlet pipeline mixer, and the water outlet of the water outlet pipeline mixer is connected with the water inlet of the water outlet pipeline. With traditional stirring with step by step the sedimentation separation remove hard device than, conventional treatment facility drops into nearly does the utility model discloses a 7 times, the utility model discloses greatly reduced construction investment and construction area to reduce the medicament and put into dose, greatly reduced manufacturing cost.
Description
The technical field is as follows:
the utility model relates to a high enriched industrial waste liquid treatment field especially relates to a high enriched industrial waste liquid is handled with high-efficient hard device that removes.
Background art:
if the industrial waste liquid with high hardness content is not subjected to early hardness removal treatment, the subsequent advanced treatment efficiency can be seriously influenced, and the stable operation of subsequent equipment is influenced. At present, the conventional water treatment removes hard device and sets up agitating unit and mud scraper etc. for setting up multistage sedimentation tank in, and equipment input cost is high, and area is big, and the medicament use amount is big, and the medicament cost is high.
Taking the treatment of the fracturing flow-back fluid as an example, the fracturing flow-back fluid belongs to high-concentration industrial waste liquid generated in the process of exploiting an oil-gas field, has complex components, contains various toxic and harmful chemicals, is directly discharged, can cause serious pollution to underground water and soil, causes irreversible environmental hidden dangers, and needs to be subjected to centralized and harmless treatment. The total amount of calcium and magnesium in the effluent water of the fracturing flow-back fluid after advanced catalytic oxidation pretreatment reaches about 4500mg/L, and CaCO is easily generated3、CaSO4、MgCO3And scaling, if hardness removal treatment is not carried out, the process index of advanced treatment cannot be met, the stable operation of a rear-end biochemical treatment, Ultrafiltration (UF) treatment, Reverse Osmosis (RO) treatment and an MVR evaporation and condensation system can be directly influenced, the water yield of the system is low, and the cleaning period and the service life of equipment are prolonged.
The utility model has the following contents:
in order to overcome the technical problem, the utility model aims to provide an equipment and medicament input cost are low, area is little, and high concentration industrial waste liquid treatment that can high efficiency reduce calcium in the water, magnesium ion removes hard device with high efficiency.
The purpose of the utility model is implemented by the following technical scheme: a high-efficiency hardness removal device for treating high-concentration industrial waste liquid comprises a water inlet pipeline mixer, a dosing device, a water outlet pipeline mixer and a primary sedimentation separation tank; the medicine outlet of the medicine adding device is respectively connected with the medicine adding port of the water inlet pipeline mixer and the medicine adding port of the water outlet pipeline mixer; the outlet of the water inlet pipeline is connected with the water inlet of the water inlet pipeline mixer, the water outlet of the water inlet pipeline mixer is connected with the water inlet of the tank body of the primary sedimentation separation tank, the overflow water outlet of the primary sedimentation separation tank is connected with the water inlet of the water outlet pipeline mixer, and the water outlet of the water outlet pipeline mixer is connected with the water inlet of the water outlet pipeline.
Further, the dosing device comprises a hydrochloric acid dosing tank, a sodium carbonate dosing tank and a sodium hydroxide dosing tank, and an outlet of the sodium carbonate dosing tank and an outlet of the sodium hydroxide dosing tank are both connected with a dosing port of the water inlet pipeline mixer through pipelines; the outlet of the hydrochloric acid dosing tank is connected with the dosing port of the water outlet pipeline mixer through a pipeline.
Further, the primary sedimentation separation tank comprises a primary tank body, an overflow water outlet is formed in the upper portion of the primary tank body, a tank body water inlet is formed in the primary tank body on the lower portion of the overflow water outlet, and a sludge discharge port is formed in the bottom of the primary tank body; a central cylinder is axially arranged in the primary tank body, the outer wall of the central cylinder is fixedly connected with the inner wall of the primary tank body through a connecting piece, and the water outlet end of the central cylinder is in a horn mouth shape with a small upper part and a large lower part; an annular overflow groove is arranged in the primary tank body, the inner ring surface of the annular overflow groove is fixedly connected with the outer wall of the central cylinder, and the outer ring surface of the annular overflow groove is fixedly connected with the inner wall of the primary tank body; the water outlet of the annular overflow groove is communicated with the overflow water outlet; a water injection pipe is further arranged in the primary tank body, a water inlet of the water injection pipe is communicated with a water inlet of the tank body, and a water outlet of the water injection pipe is arranged in the central cylinder; a bellmouth-shaped settling plate with a large upper part and a small lower part is arranged below the central cylinder, and the large opening end of the bellmouth-shaped settling plate is fixedly connected with the inner wall of the primary tank body; and a sludge discharge machine is arranged at the bottom of the first-stage tank body, and an outlet of the sludge discharge machine is communicated with a sludge discharge port at the bottom of the first-stage tank body.
Further, the water injection pipe is arranged below the annular overflow groove.
Further, a water return pipe is arranged in the first-stage tank body, a tank body water return opening is formed in the upper portion of the first-stage tank body, a water inlet of the water return pipe is communicated with the tank body water return opening, and a water outlet of the water return pipe is arranged in the central cylinder.
Further, the water return pipe is arranged below the annular overflow groove.
Further, the high-efficiency hardness removal device for treating the high-concentration industrial waste liquid also comprises a secondary sedimentation separation tank; an overflow water outlet of the primary sedimentation separating tank is connected with a water inlet of a secondary tank body of the secondary sedimentation separating tank, and a secondary overflow water outlet of the secondary sedimentation separating tank is connected with a water inlet of the water outlet pipeline mixer; and a water return port at the bottom of the secondary sedimentation separation tank is connected with a water inlet of a circulating liquid lifting pump, and a water outlet of the circulating liquid lifting pump is connected with a water return port of a tank body of the primary sedimentation separation tank.
Further, the secondary sedimentation separation tank comprises a secondary tank body, a secondary overflow water outlet is formed in the upper portion of the secondary tank body, a secondary tank body water inlet is formed in the secondary tank body on the lower portion of the secondary overflow water outlet, and a bottom water return port is formed in the bottom of the secondary tank body; a secondary central cylinder is axially arranged in the secondary tank body, the outer wall of the secondary central cylinder is fixedly connected with the inner wall of the secondary tank body through a connecting piece, and the water outlet end of the secondary central cylinder is in a horn mouth shape with a small upper part and a large lower part; a secondary annular overflow groove is arranged in the secondary tank body, the inner ring surface of the secondary annular overflow groove is fixedly connected with the outer wall of the secondary central cylinder, and the outer ring surface of the secondary annular overflow groove is fixedly connected with the inner wall of the secondary tank body; the water outlet of the secondary annular overflow groove is communicated with the secondary overflow water outlet; a secondary water injection pipe is arranged below the secondary annular overflow groove, a water inlet of the secondary water injection pipe is communicated with a water inlet of the secondary tank body, and a water outlet of the secondary water injection pipe is arranged in the secondary central cylinder; and a submersible thrust stirrer is arranged at the bottom of the second-stage tank body.
The utility model has the advantages that:
the utility model adopts a chemical softening method, removes hardness by combining a pipeline mixing reactor and a two-stage settling tank sedimentation separation, reduces the hardness of calcium and magnesium by adding sodium hydroxide and sodium carbonate, precipitates and separates the hardness in water, and quickly and efficiently reduces the content of calcium and magnesium ions in water; with traditional stirring with step-by-step sedimentation separation remove hard device than, conventional treatment facility drops into nearly does the utility model discloses a 7 times, consequently, the utility model discloses greatly reduced construction investment and construction area to reduced the medicament and put into dose, greatly reduced manufacturing cost. Meanwhile, the following advantages are also provided:
1. can be continuously treated, only the medicament is needed to be added, and the interruption caused by regeneration can be avoided;
2. the hardness in the raw water is transferred to the sludge in a solid state, and the hardness can be completely removed only by sending the sludge to a sludge treatment device for concentration and dehydration;
3. the temporary hardness and the permanent hardness can be removed simultaneously, and the softening is more thorough;
4. the method is suitable for raw water with higher hardness, and the hardness change of the raw water can be responded by adjusting the dosage;
5. a regeneration system is not needed, and the operation is simple and convenient;
6. the method can adapt to raw water with higher suspended matters, and the sodium hydroxide-soda method is combined with the subsequent clarification process, so that the impact load capacity of the suspended matters is very strong, and the blockage phenomenon cannot be caused.
Description of the drawings:
FIG. 1 is a schematic view of an efficient hardness removal apparatus for treating a high concentration industrial waste liquid according to example 1;
FIG. 2 is a schematic view of an efficient hardness removal apparatus for treating a high concentration industrial waste liquid according to example 2;
FIG. 3 is a schematic cross-sectional view of an annular isopipe;
FIG. 4 is a schematic cross-sectional view of a secondary annular isopipe.
A water inlet pipeline mixer 1, a dosing device 2, a hydrochloric acid dosing tank 2-1, a sodium carbonate dosing tank 2-2, a sodium hydroxide dosing tank 2-3, a water outlet pipeline mixer 3, a primary sedimentation separation tank 4, a primary tank 4-1, an overflow water outlet 4-2, a tank water inlet 4-3, a sludge discharge port 4-4, a central cylinder 4-5, an annular overflow tank 4-6, a water injection pipe 4-7, a bell-mouth-shaped sedimentation plate 4-8, a sludge discharge machine 4-9, a water return pipe 4-10, a tank water return port 4-11, a water inlet pipeline 5, a water outlet pipeline 6, a secondary sedimentation separation tank 7, a secondary tank 7-1, a secondary overflow water outlet 7-2, a secondary tank water inlet 7-3, a bottom water return port 7-4, a secondary central cylinder 7-5, a water outlet 7-3, a secondary tank water return port 7-, 7-6 parts of a secondary annular overflow groove, 7-7 parts of a secondary water injection pipe, 7-9 parts of a submersible thrust stirrer and 8 parts of a circulating liquid lift pump.
The specific implementation mode is as follows:
example 1: as shown in fig. 1, a high-efficiency hardness removal device for treating high-concentration industrial waste liquid comprises a water inlet pipeline mixer 1, a dosing device 2, a water outlet pipeline mixer 3 and a primary sedimentation separation tank 4; wherein the medicine adding device 2 comprises a hydrochloric acid medicine adding tank 2-1, a sodium carbonate medicine adding tank 2-2 and a sodium hydroxide medicine adding tank 2-3, and an outlet of the sodium carbonate medicine adding tank 2-2 and an outlet of the sodium hydroxide medicine adding tank 2-3 are connected with a medicine adding port of the water inlet pipeline mixer 1 through pipelines; the outlet of the hydrochloric acid dosing tank 2-1 is connected with the dosing port of the water outlet pipeline mixer 3 through a pipeline.
The primary sedimentation separation tank 4 comprises a primary tank body 4-1, the upper part of the primary tank body 4-1 is provided with an overflow water outlet 4-2, the primary tank body 4-1 at the lower part of the overflow water outlet 4-2 is provided with a tank body water inlet 4-3, and the bottom of the primary tank body 4-1 is provided with a sludge discharge port 4-4; a central cylinder 4-5 is axially arranged in the primary tank body 4-1, the outer wall of the central cylinder 4-5 is fixedly connected with the inner wall of the primary tank body 4-1 through a connecting piece, the water outlet end of the central cylinder 4-5 is in a bell mouth shape with a small upper part and a large lower part, and the bell mouth-shaped outlet enables inlet water to diffuse towards the periphery below the primary tank body 4-1, so that the reaction settling time is prolonged, and the settling separation effect is improved; an annular overflow groove 4-6 is arranged in the first-stage tank body 4-1, the inner ring surface of the annular overflow groove 4-6 is fixedly connected with the outer wall of the central cylinder 4-5, and the outer ring surface of the annular overflow groove 4-6 is fixedly connected with the inner wall of the first-stage tank body 4-1; the water outlet of the annular overflow groove 4-6 is communicated with the overflow water outlet 4-2; a water injection pipe 4-7 is arranged below the annular overflow groove 4-6, the water inlet of the water injection pipe 4-7 is communicated with the water inlet 4-3 of the tank body, and the water outlet of the water injection pipe 4-7 is arranged in the central cylinder 4-5; the inlet water flows into the first-stage tank body 4-1 from the central cylinder 4-5, so that the inlet water is prevented from being stirred and mixed with the clear liquid on the upper part of the first-stage tank body 4-1, and the sedimentation separation effect is ensured. A bellmouth-shaped settling plate 4-8 with a large upper part and a small lower part is arranged below the central cylinder 4-5, and the large opening end of the bellmouth-shaped settling plate 4-8 is fixedly connected with the inner wall of the first-stage tank body 4-1; the bell-mouthed design of the water outlet end of the central cylinder 4-5 and the bell-mouthed design of the water outlet end of the central cylinder 4-5 prevent the inflow water from directly flowing into the bottom of the first-stage tank body 4-1 and stirring and floating the sediments at the bottom of the first-stage tank body 4-1; the setting of the bell-mouth-shaped settling plate 4-8 can prevent the sediments from floating upwards to be mixed with the clear liquid to a certain degree on one hand, and the sediments can be settled to the bottom of the first-stage tank body 4-1 along the bell-mouth-shaped settling plate 4-8 on the other hand; the bell mouth shape design of the water outlet end of the central cylinder 4-5 and the arrangement of the bell mouth shape sedimentation plate 4-8 are combined to ensure the sedimentation and separation effect of the water body.
The bottom of the first-stage tank body 4-1 is provided with a sludge discharge machine 4-9, and the outlet of the sludge discharge machine 4-9 is communicated with the sludge discharge port 4-4 at the bottom of the first-stage tank body 4-1.
The outlet of the water inlet pipe 5 is connected with the water inlet of the water inlet pipe mixer 1, the water outlet of the water inlet pipe mixer 1 is connected with the water inlet 4-3 of the tank body of the primary sedimentation separation tank, the overflow water outlet 4-2 of the primary sedimentation separation tank is connected with the water inlet of the water outlet pipe mixer 3, and the water outlet of the water outlet pipe mixer 3 is connected with the water inlet of the water outlet pipe 6.
By using the hardness removal method of the embodiment 1, the pretreated high-hardness wastewater is pressurized and lifted by a raw material liquid inlet lifting pump, and enters a central cylinder 4-5 of a primary sedimentation separation tank through a water inlet pipeline 5 and a water inlet pipeline mixer 1, wherein the water inlet pipeline mixer 1 is a micro-vortex pipeline mixing reactor in the embodiment; sodium hydroxide NaOH is added into the water inlet pipeline mixer 1Sodium carbonate NaCO3After mixing and primary chemical reaction, the mixture flows into a central cylinder 4-5 of a primary sedimentation separation tank 4, and is sedimentated downwards along the central cylinder 4-5, and enters the lower part of the primary sedimentation separation tank 4, further chemical reaction is carried out in the process to form calcium carbonate and magnesium carbonate precipitates, the precipitates are sedimentated downwards to the bottom of the primary sedimentation separation tank 4 through an outlet below a bell-mouthed sedimentation plate 4-8, and then the precipitates are discharged into a sludge concentration tank through a sludge discharge machine 4-9 to carry out solid-liquid separation. In the embodiment, the sludge discharge machines 4-9 are wet type built-in negative pressure sludge discharge machines.
Supernatant outside a central cylinder 4-5 of the primary sedimentation separating tank flows into an annular overflow groove 4-6 from the top edge of the annular overflow groove 4-6 and then flows into a water outlet pipeline mixer 3 through an overflow water outlet 4-2 of the primary sedimentation separating tank 4; hydrochloric acid (HCL) is added into the water outlet pipeline mixer 3 to adjust the pH value, and then the mixture enters a biochemical degradation working section. In this embodiment, the outlet pipe mixer 3 is a micro-vortex pipe mixing reactor.
Example 2: as shown in figure 2, the high-efficiency hardness removal device for treating the high-concentration industrial waste liquid is different from the embodiment 1 in that the device further comprises a secondary sedimentation separation tank 7, meanwhile, the primary sedimentation separation tank is also provided with a water return pipe 4-10, the upper part of the primary tank body 4-1 is provided with a tank body water return port 4-11, the water return pipe 4-10 is arranged below an annular overflow tank 4-6, a water inlet of the water return pipe 4-10 is communicated with the tank body water return port 4-11, and a water outlet of the water return pipe 4-10 is arranged in a central cylinder 4-5.
The secondary sedimentation separation tank 7 comprises a secondary tank body 7-1, the upper part of the secondary tank body 7-1 is provided with a secondary overflow water outlet 7-2, the secondary tank body 7-1 at the lower part of the secondary overflow water outlet 7-2 is provided with a secondary tank body water inlet 7-3, and the bottom of the secondary tank body 7-1 is provided with a bottom water return port 7-4; a secondary central cylinder 7-5 is axially arranged in the secondary tank body 7-1, the outer wall of the secondary central cylinder 7-5 is fixedly connected with the inner wall of the secondary tank body 7-1 through a connecting piece, and the water outlet end of the secondary central cylinder 7-5 is in a horn mouth shape with a small upper part and a big lower part; a secondary annular overflow groove 7-6 is arranged in the secondary tank body 7-5, the inner ring surface of the secondary annular overflow groove 7-6 is fixedly connected with the outer wall of the secondary central cylinder 7-5, and the outer ring surface of the secondary annular overflow groove 7-6 is fixedly connected with the inner wall of the secondary tank body 7-1; the water outlet of the secondary annular overflow groove 7-6 is communicated with the secondary overflow water outlet 7-2; a secondary water injection pipe 7-7 is arranged below the secondary annular overflow groove 7-6, the water inlet of the secondary water injection pipe 7-7 is communicated with the water inlet 7-3 of the secondary tank body, and the water outlet of the secondary water injection pipe 7-7 is arranged in the secondary central cylinder 7-5; the bottom of the second-stage tank body 7-1 is provided with a diving thrust stirrer 7-9.
An overflow water outlet 4-2 of the primary sedimentation separation tank 4 is connected with a secondary tank body water inlet 7-3 of a secondary sedimentation separation tank 7, and a secondary overflow water outlet 7-2 of the secondary sedimentation separation tank 7 is connected with a water inlet of the water outlet pipeline mixer 3; a water return port 7-4 at the bottom of the secondary sedimentation separation tank 7 is connected with a water inlet of a circulating liquid lift pump 8, and a water outlet of the circulating liquid lift pump 8 is connected with a tank body water return port 4-11 of the primary sedimentation separation tank 4.
The hardness removal method of the embodiment 2 is used, and is different from the embodiment 1 in that: supernatant in the primary sedimentation separation tank 4 flows into a secondary central cylinder 7-5 of a secondary sedimentation separation tank 7 through an overflow water outlet 4-2, and the supernatant prolongs the chemical reaction precipitation time in the secondary sedimentation separation tank 7, so that the effect of further removing calcium, magnesium and the like is achieved, and the process index requirements are met. The formed precipitate is stirred at regular time by a submersible thrust stirrer 7-9, lifted into a central cylinder 4-5 of a primary sedimentation separation tank 4 by a circulating liquid lifting pump 8, and mixed, reacted and precipitated in the primary sedimentation separation tank 4 together with the water inlet in the central cylinder 4-5. Supernatant outside a secondary central cylinder 7-5 of the secondary sedimentation separation tank 7 flows into a secondary annular overflow groove 7-6 from the top edge of the secondary annular overflow groove 7-6, and then flows into the water outlet pipeline mixer 3 through a secondary overflow water outlet 7-2 of the secondary sedimentation separation tank 7.
Whether the secondary sedimentation separation tank 7 needs to be added or not is determined by the content of calcium ions, magnesium ions and the like in the supernatant in the primary sedimentation separation tank 4, if the requirement of subsequent water treatment is met, the secondary sedimentation separation tank 7 does not need to be added, otherwise, the secondary sedimentation separation tank 7 needs to be added.
The embodiment is used for treating the fracturing flow-back fluid subjected to advanced catalytic oxidation pretreatment, the fracturing flow-back fluid belongs to high-concentration industrial waste liquid generated in the exploitation process of oil and gas fields, is complex in component, contains various toxic and harmful chemicals, is directly discharged and canLeading to serious pollution of underground water and soil and irreversible environmental hidden trouble, and needing centralized and harmless treatment. The total amount of calcium and magnesium in the effluent water of the fracturing flow-back fluid after advanced catalytic oxidation pretreatment reaches about 4500mg/L, and CaCO is easily generated3、CaSO4、MgCO3And scaling, if the ion exchange hardness removal treatment is not carried out, the process index of advanced treatment cannot be met, the stable operation of a rear-end biochemical treatment, Ultrafiltration (UF) treatment, Reverse Osmosis (RO) treatment and an MVR evaporation and condensation system can be directly influenced, the water yield of the system is reduced, and the cleaning period and the service life of equipment are prolonged. In order to make the back-end process operate efficiently, the high-efficiency hardness removal device for treating the high-concentration industrial waste liquid is adopted, the hardness of calcium and magnesium is reduced by adding sodium hydroxide and sodium carbonate, the hardness of water is precipitated, calcium and magnesium ions in the water are reduced rapidly and efficiently, the total amount index is less than or equal to 500mg/L, and the purpose of removal is achieved. The process index of advanced treatment is met and stabilized, the water yield of subsequent process equipment is improved, the cleaning times of Ultrafiltration (UF) treatment, Reverse Osmosis (RO) treatment and MVR evaporation and condensation systems are reduced, the service life of the equipment is prolonged, and the enterprise benefit is increased. Through the field application, the utility model discloses high enriched industrial waste liquid is handled with high-efficient except that hard device and traditional stirring add step by step the sedimentation separation and remove hard device, has reduced 80% construction investment and 90% construction area to reduced 50% medicament and thrown the dosage, practiced thrift manufacturing cost.
Principle of chemical softening and hardness removal
The chemical softening is a process of removing a hard or slightly soluble compound contained in water by applying the principle of chemical precipitation, that is, the principle of solubility product, with the action of an appropriate chemical. The most common method in water treatment is the combined precipitation of calcium and magnesium ions followed by the precipitation of the hydroxide of the metal ion. Therefore, the process is often performed simultaneously with the coagulation, precipitation or clarification process.
The chemical softening method is to adopt a sodium hydroxide-soda softening method, because the project needs to remove the permanent hardness in the wastewater and should minimize the introduction of new permanent hardness.
Sodium hydroxide is generally used to remove carbonate hardness (temporary hardness) from water in the sodium hydroxide-soda process, and soda is used to remove non-carbonate hardness (permanent hardness). The reaction principle is as follows:
1. removing temporary hardness in water:
the project designs that sodium hydroxide is added to remove the carbonate hardness (temporary hardness) in water, and the reaction principle is as follows:
2NaOH+CO2→Na2CO3+H2O
Ca(HCO3)2+2NaOH→CaCO3↓+Na2CO3+2H2O
Mg(HCO3)2+2NaOH→MgCO3+Na2CO3+2H2O
MgCO3+2NaOH→Mg(OH)2↓+Na2CO3
2. removing permanent hardness in water:
CaSO4+Na2CO3→CaCO3↓+Na2SO4
CaCl2+Na2CO3→CaCO3↓+2NaCl
MgSO4+Na2CO3→MgCO3+Na2SO4
MgCl2+Na2CO3→MgCO3+2NaCl
at higher pH, MgCO3Quick hydrolysis:
MgCO3+H2O→Mg(OH)2↓+CO2↑
sodium carbonate also removes part of the temporary hardness:
Ca(HCO3)2+Na2CO3→CaCO3↓+2NaHCO3
Mg(HCO3)2+Na2CO3→MgCO3+2NaHCO3
MgCO3+H2O→Mg(OH)2↓+CO2↑
the high-efficiency hardness removing device for treating the high-concentration industrial waste liquid has the advantages of performing a sodium hydroxide-soda softening method:
1. can be continuously treated, only the medicament is needed to be added, and the interruption caused by regeneration can be avoided;
2. the hardness in the raw water is transferred to the sludge in a solid state, and the hardness can be completely removed only by sending the sludge to a sludge treatment device for concentration and dehydration;
3. the temporary hardness and the permanent hardness can be removed simultaneously, and the softening is more thorough;
4. the method is suitable for raw water with higher hardness, and the hardness change of the raw water can be responded by adjusting the dosage;
5. a regeneration system is not needed, and the operation is simple and convenient;
6. the method can adapt to raw water with higher suspended matters, and the sodium hydroxide-soda method is combined with the subsequent clarification process, so that the impact load capacity of the suspended matters is very strong, and the blockage phenomenon cannot be caused.
Second, the experimental procedure
Meter-fracturing flow-back fluid pretreatment effluent index (unit: mg/L)
The experimental scheme is as follows: 1. taking 500ml of fracturing flow-back fluid pretreatment effluent from 5 beakers in sequence;
2. sequentially adding NaOH and NaCO into 5 beakers in different proportions3The adding amount is shown in a second table;
3. after staying for 15 hours, detecting the indexes of the supernatant, and showing in the third table;
4. and calculating the removal rate of 5 schemes, and selecting the optimal addition amount shown in the fourth table.
Watch two
Watch III
Watch four
Third, conclusion
The experiments show that although the total hardness removal rate of the scheme I and the scheme II reaches more than 97%, the residual alkalinity in a water sample is too high, so that unnecessary medicament adding waste is caused, and the method is not preferable; the total hardness of the scheme IV and the scheme V does not meet the requirement that the total hardness of the experimental target is less than or equal to 500mg/L, so that the method is not advisable; in the scheme, the addition amount of NaOH is 3 per mill and Na2CO3When the dry powder is added by 4 per mill, the reaction time is kept for 15h, the total hardness meets the requirement that the experimental purpose is less than 500mg/L, the removal rate of the total hardness is 94.83 percent, the residual carbonate in the water is 960mg/L, the alkalinity is proper, and the requirement of the alkalinity can be provided when the water is fed for biochemical treatment, so the optimum adding amount is obtained.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A high-efficiency hardness removal device for treating high-concentration industrial waste liquid is characterized by comprising a water inlet pipeline mixer, a dosing device, a water outlet pipeline mixer and a primary settling separation tank; the medicine outlet of the medicine adding device is respectively connected with the medicine adding port of the water inlet pipeline mixer and the medicine adding port of the water outlet pipeline mixer; the outlet of the water inlet pipeline is connected with the water inlet of the water inlet pipeline mixer, the water outlet of the water inlet pipeline mixer is connected with the water inlet of the tank body of the primary sedimentation separation tank, the overflow water outlet of the primary sedimentation separation tank is connected with the water inlet of the water outlet pipeline mixer, and the water outlet of the water outlet pipeline mixer is connected with the water inlet of the water outlet pipeline.
2. The high-efficiency hardness removal device for treating the high-concentration industrial waste liquid according to claim 1, wherein the dosing device comprises a hydrochloric acid dosing tank, a sodium carbonate dosing tank and a sodium hydroxide dosing tank, and an outlet of the sodium carbonate dosing tank and an outlet of the sodium hydroxide dosing tank are connected with a dosing port of the water inlet pipeline mixer through pipelines; the outlet of the hydrochloric acid dosing tank is connected with the dosing port of the water outlet pipeline mixer through a pipeline.
3. The high-efficiency hardness removal device for high-concentration industrial waste liquid treatment according to claim 1, wherein the primary sedimentation separation tank comprises a primary tank body, an overflow water outlet is formed in the upper portion of the primary tank body, a tank body water inlet is formed in the primary tank body below the overflow water outlet, and a sludge discharge port is formed in the bottom of the primary tank body; a central cylinder is axially arranged in the primary tank body, the outer wall of the central cylinder is fixedly connected with the inner wall of the primary tank body through a connecting piece, and the water outlet end of the central cylinder is in a horn mouth shape with a small upper part and a large lower part; an annular overflow groove is arranged in the primary tank body, the inner ring surface of the annular overflow groove is fixedly connected with the outer wall of the central cylinder, and the outer ring surface of the annular overflow groove is fixedly connected with the inner wall of the primary tank body; the water outlet of the annular overflow groove is communicated with the overflow water outlet; a water injection pipe is further arranged in the primary tank body, a water inlet of the water injection pipe is communicated with a water inlet of the tank body, and a water outlet of the water injection pipe is arranged in the central cylinder; a bellmouth-shaped settling plate with a large upper part and a small lower part is arranged below the central cylinder, and the large opening end of the bellmouth-shaped settling plate is fixedly connected with the inner wall of the primary tank body; and a sludge discharge machine is arranged at the bottom of the first-stage tank body, and an outlet of the sludge discharge machine is communicated with a sludge discharge port at the bottom of the first-stage tank body.
4. The high-efficiency hardness removal device for high-concentration industrial waste liquid treatment according to claim 3, wherein the water injection pipe is arranged below the annular overflow trough.
5. The high-efficiency hardness removal device for high-concentration industrial waste liquid treatment as claimed in claim 3, wherein a water return pipe is arranged in the primary tank, a tank water return port is arranged at the upper part of the primary tank, a water inlet of the water return pipe is communicated with the tank water return port, and a water outlet of the water return pipe is arranged in the central cylinder.
6. The high-efficiency hardness removal device for high-concentration industrial waste liquid treatment according to claim 5, wherein the water return pipe is arranged below the annular overflow trough.
7. The high-efficiency hardness removal device for treating high-concentration industrial waste liquid according to claim 5 or 6, further comprising a secondary sedimentation separation tank; an overflow water outlet of the primary sedimentation separating tank is connected with a water inlet of a secondary tank body of the secondary sedimentation separating tank, and a secondary overflow water outlet of the secondary sedimentation separating tank is connected with a water inlet of the water outlet pipeline mixer; and a water return port at the bottom of the secondary sedimentation separation tank is connected with a water inlet of a circulating liquid lifting pump, and a water outlet of the circulating liquid lifting pump is connected with a water return port of a tank body of the primary sedimentation separation tank.
8. The high-efficiency hardness removal device for high-concentration industrial waste liquid treatment according to claim 7, wherein the secondary sedimentation separation tank comprises a secondary tank body, a secondary overflow water outlet is formed in the upper portion of the secondary tank body, a secondary tank body water inlet is formed in the secondary tank body below the secondary overflow water outlet, and a bottom water return port is formed in the bottom of the secondary tank body; a secondary central cylinder is axially arranged in the secondary tank body, the outer wall of the secondary central cylinder is fixedly connected with the inner wall of the secondary tank body through a connecting piece, and the water outlet end of the secondary central cylinder is in a horn mouth shape with a small upper part and a large lower part; a secondary annular overflow groove is arranged in the secondary tank body, the inner ring surface of the secondary annular overflow groove is fixedly connected with the outer wall of the secondary central cylinder, and the outer ring surface of the secondary annular overflow groove is fixedly connected with the inner wall of the secondary tank body; the water outlet of the secondary annular overflow groove is communicated with the secondary overflow water outlet; a secondary water injection pipe is arranged below the secondary annular overflow groove, a water inlet of the secondary water injection pipe is communicated with a water inlet of the secondary tank body, and a water outlet of the secondary water injection pipe is arranged in the secondary central cylinder; and a submersible thrust stirrer is arranged at the bottom of the second-stage tank body.
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