CN212864438U - Recycling calcium carbonate wastewater treatment system - Google Patents
Recycling calcium carbonate wastewater treatment system Download PDFInfo
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Abstract
The utility model discloses a cyclic utilization calcium carbonate treatment effluent disposal system. This cyclic utilization calcium carbonate treatment wastewater system includes softening installation, deposits device, clarification device, sludge dewatering device, filter equipment, membrane enrichment facility, calcium carbonate calcining device, calcium oxide curing device and evaporation crystallization device, softening installation, precipitation device, clarification device, filter equipment, membrane enrichment facility and evaporation crystallization device connect gradually, sludge dewatering device with it connects to deposit the device, calcium oxide curing device with softening installation connects, calcium carbonate calcining device respectively with sludge dewatering device with clarification device the calcium oxide curing device is connected. The calcium carbonate recycling wastewater treatment system can reduce system energy consumption, reduce carbon emission, effectively recycle sludge, reduce system operation cost and realize recycling of wastewater treatment resources.
Description
Technical Field
The utility model relates to a water treatment field especially relates to a cyclic utilization calcium carbonate treatment effluent disposal system.
Background
At present, the industry in northwest areas develops rapidly, a large amount of industrial wastewater is generated in various industrial production, and the wastewater is subjected to early reverse osmosis concentration treatment or circulating cooling water evaporation to cause the concentration of inorganic salts and organic matters in the wastewater. Particularly, the increase of calcium and magnesium ions and alkalinity is remarkable, and the reduction is required to be within a limit value range no matter which treatment process is adopted subsequently. At present, zero-emission treatment process is advocated vigorously in the field of environmental protection, so an evaporative crystallization system becomes an essential workshop section in the water treatment industry.
The main treatment process for removing high hardness and high alkalinity in water at the present stage comprises the following steps: the lime softening method is characterized in that lime and sodium carbonate are added into the wastewater to remove calcium and magnesium ions, but the generated precipitation amount is large, a dosing pipeline and a sedimentation tank are easy to block, and the treatment cost and the maintenance cost are high; and secondly, the ion exchange resin reduces the content of calcium and magnesium ions in water through replacement, but the regeneration is frequent and the investment cost is high.
In addition, the pretreated wastewater enters an evaporative crystallization system through concentration salt separation, wherein the heat source of the evaporative crystallization system mainly comprises steam and electric power, and the heat source of the evaporative crystallization system is a main component of the operation cost of the evaporative crystallization system and accounts for 50-65% of the total cost, so that the cost of the existing treatment method is high.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide a cyclic utilization calcium carbonate wastewater treatment system which can reduce system energy consumption, reduce carbon emission, effectively recycle sludge, reduce system operation cost and realize wastewater treatment resource cyclic utilization.
The utility model provides a cyclic utilization calcium carbonate treatment wastewater system, includes softening installation, deposits device, clarification device, sludge dewatering device, filter equipment, membrane enrichment facility, calcium carbonate calcining device, calcium oxide curing device and evaporation crystallization device, softening installation, deposits device, clarification device, filter equipment, membrane enrichment facility and evaporation crystallization device connect gradually in proper order, sludge dewatering device with it connects to deposit the device, calcium oxide curing device with softening installation connects, calcium carbonate calcining device respectively with sludge dewatering device with clarification device calcium oxide curing device connects.
In one embodiment, the system for recycling calcium carbonate to treat wastewater further comprises a water production device, and the water production device is connected with the membrane concentration device.
In one embodiment, the water producing device is further connected with the calcium oxide curing device for calcium oxide curing.
In one embodiment, the calcium oxide slaking device comprises a slaking water inlet pump, a slaker and a limestone feeding pump, wherein the slaker is connected with a water production device through the slaking water inlet pump, and the slaker is connected with the calcium carbonate calcining device through the limestone feeding pump.
In one embodiment, the calcium carbonate calcining device comprises a calcium carbonate calcining furnace and a cyclone dust collector, the calcium carbonate calcining furnace is connected with the clarifying device through the cyclone dust collector, and the cyclone dust collector is used for collecting CO generated in the calcining process of the calcium carbonate calcining furnace2And is conveyed to the clarifying device after dust removal.
In one embodiment, the system for recycling calcium carbonate to treat wastewater further comprises a finished product bin, the finished product bin is connected with the calcium carbonate calcining device, and calcium oxide generated by calcining of the calcium carbonate calcining device enters the finished product bin after being cooled.
In one embodiment, at least one ash discharge conveying device is arranged between the finished product bin and the calcium oxide curing system and is used for conveying part of calcium oxide into the calcium oxide curing system.
In one embodiment, the system for recycling calcium carbonate to treat wastewater further comprises a heat collector, wherein the heat collector is arranged on the calcium oxide curing device and is used for collecting heat generated by calcium oxide curing and transmitting the heat to the evaporative crystallization device.
In one embodiment, the filtration device is an ultrafiltration module.
In one embodiment, the sludge dewatering device comprises a plate-and-frame filter press and a plate-and-frame discharge pump, the plate-and-frame filter press is connected with the precipitation device, and the plate-and-frame filter press is further connected with the calcium carbonate calcination device through the plate-and-frame discharge pump.
The utility model discloses a calcium carbonate treatment wastewater system can reduce the system energy consumption, reduce carbon emission, effective recycle mud, reduce system's running cost, realize waste water treatment resourceful cyclic utilization.
The utility model discloses a calcium carbonate treatment wastewater method has following beneficial effect:
1. the evaporative crystallization device does not need electric power or a steam stripping heat supply source, the running cost of the whole evaporative crystallization device is reduced by 80-95%, and the energy consumption of the whole calcium carbonate treatment wastewater system is reduced by 70%.
2. The softening device generates a large amount of sludge such as calcium carbonate to be recycled, and the process for treating wastewater by recycling calcium carbonate avoids the problem of higher operation cost caused by excessive addition of medicament on one hand and reduces the treatment cost of sludge on the other hand; compared with the traditional process, the calcium carbonate wastewater treatment method only adds a calcium carbonate calcining device and a calcium oxide curing device, and the investment cost is obviously reduced relatively.
3. The utility model discloses a heat that ripe fossil ash produced does not have secondary pollution in the calcium carbonate treatment wastewater method, has realized effective recycle, when reducing carbon emission, utilizes carbon dioxide recovery to adjust pH, reduces the system running cost.
4. The utility model discloses a calcium carbonate treatment wastewater method has realized effective recycle mud, reduces system's running cost.
5. The utility model discloses a calcium carbonate treatment wastewater method whole in-process does not have the outer row of pollutants such as mud, waste liquid, has realized waste water treatment resource cyclic utilization completely.
Drawings
FIG. 1 is a process flow diagram of a system for recycling calcium carbonate to treat wastewater according to an embodiment of the present invention;
FIG. 2 is a schematic view of a system for recycling calcium carbonate to treat wastewater according to an embodiment of the present invention.
10. A wastewater treatment system for recycling calcium carbonate; 100. a softening device; 101. a softening tank; 102. softening the stirrer; 200. a precipitation device; 201. a sedimentation tank; 202. a sludge pump; 300. a clarification device; 301. A clarification tank; 302. a clarifying stirrer; 400. a sludge dewatering device; 401. a plate-and-frame filter press; 402. a plate frame discharging pump; 500. a filtration device; 501. an ultrafiltration water intake pump; 502. an ultrafiltration membrane device; 503. an ultrafiltration water-producing tank; 600. a membrane concentration device; 601. high-pressure reverse osmosis; 602. a membrane concentration water inlet pump; 700. a calcium carbonate calcining device; 701. a calcium carbonate calcining furnace; 702. a cyclone dust collector; 800. a calcium oxide curing device; 801. a curing water inlet pump; 802. a curing device; 803. a limestone feed pump; 900. an evaporative crystallization device; 901. an evaporative heat exchanger; 902. an evaporation circulating pump; 1000. a water producing device.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In the description of the present invention, it should be understood that the terms used in the present invention are used in the description of the present invention, and it should be understood that the terms "center", "upper", "lower", "bottom", "inner", "outer" and the like used in the present invention are used as the terms of the orientation or the positional relationship shown in the drawings, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening elements, or they may be in communication within two elements, i.e., when an element is referred to as being "secured to" another element, it may be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, one embodiment of the present invention provides a system 10 for recycling calcium carbonate to treat wastewater. The system 10 for recycling calcium carbonate to treat wastewater comprises a softening device 100, a precipitation device 200, a clarification device 300, a sludge dewatering device 400, a filtering device 500, a membrane concentration device 600, a calcium carbonate calcining device 700, a calcium oxide curing device 800 and an evaporation crystallization device 900. The softening device 100, the precipitation device 200, the clarification device 300, the filtering device 500, the membrane concentration device 600 and the evaporation crystallization device 900 are sequentially connected, the sludge dewatering device 400 is connected with the precipitation device 200, the calcium oxide curing device 800 is connected with the softening device 100, and the calcium carbonate calcining device 700 is respectively connected with the clarification device 300, the sludge dewatering device 400 and the calcium oxide curing device 800.
In one particular example, the system 10 for recycling calcium carbonate to treat wastewater further includes a water producing device 1000. The water producing apparatus 1000 is connected to the membrane concentration apparatus 600.
In one particular example, the water producing device 1000 is also connected to a calcium oxide slaking device 800 for calcium oxide slaking.
In one particular example, the system 10 for recycling calcium carbonate to treat wastewater further includes a sludge dewatering discharge pump and a vibratory feeder. The sludge dewatering device 400 is connected with the calcium carbonate calcining device 700 through a sludge dewatering discharge pump and a vibrating feeder.
In one particular example, the calcium carbonate calcining apparatus 700 includes a calcium carbonate calcining furnace 701 and a cyclone 702. The calcium carbonate calcining furnace 701 is connected with the clarifying device 300 through a cyclone 702, and the cyclone 702 is used for collecting CO generated in the calcining process of the calcium carbonate calcining furnace 7012And is transported to the clarifying apparatus 300 after dust removal.
In a specific example, the system 10 for recycling calcium carbonate to treat wastewater further comprises a finished product bin, the finished product bin is connected with the calcium carbonate calcining device 700, and calcium oxide generated by calcining in the calcium carbonate calcining device 700 enters the finished product bin after being cooled.
In one specific example, the system 10 for recycling calcium carbonate to treat wastewater further comprises an ash discharge conveying device connected between the finished product bin and the calcium oxide curing device 800, wherein a part of calcium oxide in the finished product bin is conveyed into the calcium oxide curing device 800 through the ash discharge conveying device, and a part of calcium oxide is packaged and sold.
In one specific example, the system 10 for recycling calcium carbonate to treat wastewater further comprises a heat collector disposed on the calcium oxide slaking apparatus 800, the heat collector is used for collecting heat generated by slaking calcium oxide and transferring the heat to the evaporative crystallization apparatus 900.
In one particular example, the filtration device 500 is an ultrafiltration module.
Referring to FIG. 2, in another embodiment, the softening unit 100 includes a softening tank 101 and a softening blender 102 disposed within the softening tank 101.
The settling device 200 includes a settling tank 201 and a sludge pump 202 disposed in the settling tank 201.
The clarification device 300 includes a clarifier 301 and a clarification blender 302 disposed within the clarifier 301.
The filtering device 500 comprises an ultrafiltration water inlet pump 501, an ultrafiltration membrane device 502 and an ultrafiltration water generating tank 503 which are sequentially communicated.
The membrane concentration device 600 includes a high pressure reverse osmosis 601 and a membrane concentration feed pump 602.
Specifically, the evaporative crystallization apparatus 900 includes an evaporative heat exchanger 901 and an evaporative circulation pump 902.
The softening tank 101, the sedimentation tank 201, the clarification tank 301, an ultrafiltration water inlet pump 501, an ultrafiltration membrane device 502, an ultrafiltration water production tank 503, a membrane concentration water inlet pump 602, a high-pressure reverse osmosis 601, an evaporation circulating pump 902 and an evaporation heat exchanger 901 are sequentially connected.
Further, the sludge dewatering device 400 comprises a plate-and-frame filter press 401 and a plate-and-frame discharge pump 402, the plate-and-frame filter press 401 is connected with the precipitation device 200, and the plate-and-frame filter press 401 is also connected with the calcium carbonate calcining furnace 701 of the calcium carbonate calcining device 700 through the plate-and-frame discharge pump 402.
Further, the calcium oxide slaking apparatus 800 includes a slaking water feed pump 801, a slaker 802, and a limestone feed pump 803, the slaker 802 is connected to the water producing apparatus 1000 by the slaking water feed pump 801, and the slaker 802 is connected to the calcium carbonate calcining furnace 701 of the calcium carbonate calcining apparatus 700 by the limestone feed pump 803. An embodiment of the utility model provides a method for treating wastewater by recycling calcium carbonate.
The utility model discloses a calcium carbonate treatment wastewater system can reduce the system energy consumption, reduce carbon emission, effective recycle mud, reduce system's running cost, realize waste water treatment resourceful cyclic utilization.
A method for recycling calcium carbonate to treat wastewater comprises the following steps:
referring to fig. 1 and 2, the high hardness and high alkalinity wastewater enters a softening device 100, and a calcium hydroxide solution with a concentration of 3-6% is added into the softening device 100 to be stirred and reacted to form a turbid solution; the stirring reaction time is 10-20min, and the stirring speed is 100-120 rpm.
The working principle of the softening device 100, i.e. the reaction equation, is as follows:
Ca(OH)2+Ca(HCO3)2＝2CaCO3↓+2H2O；
2Ca(OH)2+Mg(HCO3)2＝2CaCO3↓+Mg(OH)2↓+2H2O；
MgSO4+Ca(OH)2＝CaSO4↓+Mg(OH)2↓；
MgCl2+Ca(OH)2＝CaCl2↓+Mg(OH)2↓。
the turbid liquid enters the precipitation device 200 through an overflow port for precipitation to realize solid-liquid separation to form precipitate and supernatant, the retention time of the precipitation device 200 is 45min, the precipitate enters the sludge dewatering device 400 through the sludge pump 202 for dewatering treatment to obtain sludge, the water content of the sludge after dewatering is 65-75%, for example, the water content of the sludge after dewatering is 65%, 68%, 70%, 75% or other numerical values.
The supernatant enters the clarifying device 300 through an overflow port, carbon dioxide is introduced into the clarifying device 300 to adjust the pH value to a preset range, and the supernatant enters the filtering device 500 through a water inlet pump of the filtering device 500 to carry out solid-liquid deep separation and partial removal of COD. The carbon dioxide is introduced into the clarifying device 300 to adjust the pH value to a predetermined range of pH value 7.0-8.3. The principle of introducing carbon dioxide into the clarification device 300 to adjust the pH value is as follows:
carbon dioxide is passed to a clarification device 300 to adjust the pH and remove suspended matter by filtration:
CO2+H2O＝H2CO3；
CO2+OH-＝HCO3 －。
the sludge (main component calcium carbonate) with the water content of 65-75% generated by the sludge dewatering device 400 is conveyed to a vibration feeder of the calcium carbonate calcining device 700 through a belt conveyor and then enters a calcining furnace of the calcium carbonate calcining device 700 for calcining, and the calcining temperature of the calcium carbonate calcining device 700 is 600-700 ℃, for example, the calcining temperature of the calcium carbonate calcining device 700 is 600 ℃, 650 ℃, 700 ℃ or other values. CO produced by calcination2Enters a cyclone dust collector 702 to be collected and conveyed to a clarifying device 300, and after calcium oxide generated by calcination is cooled, the calcium oxide enters a finished product bin and then is conveyed to a calcium oxide curing system through an ash discharging conveying device.
The calcium oxide generated by the calcium carbonate calcining device 700 enters the calcium oxide curing device 800, and the mass ratio of the calcium oxide to the water in the calcium oxide curing device 800 is 1:3.5-1:5, for example, the mass ratio of the calcium oxide to the water in the calcium oxide curing device 800 is 1:3.5, 1:4, 1:5 or other ratios.
Heating calcium carbonate to 370 c by the calcium carbonate calcination apparatus 700 decomposes calcium carbonate into calcium oxide and carbon dioxide. The reaction equation is as follows:
CaCO3→CaO+CO2↑。
calcium oxide and water are subjected to curing and heat release to generate calcium hydroxide, heat generated by the calcium carbonate calcining device 700 is collected by a heat collector and transmitted to the evaporative crystallization device 900, and the calcium hydroxide generated by the calcium oxide curing device 800 is transmitted to the softening device 100.
The slaking reaction of calcium oxide and water is as follows:
CaO+H2O→Ca(OH)2。
the effluent of the filtering device 500 directly enters the membrane concentration device 600 through a water inlet pump of the membrane concentration device 600, the turbidity of the effluent of the filtering device 500 is less than 2NTU, and the effluent is subjected to middle-high pressure reverse osmosis concentration TDS to be not less than 170000mg/L, which can only be set as required; the water produced by the membrane concentration device 600 enters the water production device 1000 and then enters the calcium oxide curing device 800 for calcium oxide curing, the concentrated water of the membrane concentration device 600 enters the evaporation crystallization device 900, the evaporation crystallization device 900 evaporates the concentrated water to generate crystal salt, the evaporation heat source of the evaporation crystallization device 900 comes from the heat generated by the calcium oxide curing device 800, and the evaporation temperature of the evaporation crystallization device 900 is 140-160 ℃.
The utility model discloses a calcium carbonate treatment wastewater method has following beneficial effect:
1. the evaporative crystallization device 900 does not need electric power or a steam stripping heat supply source, reduces the running cost of the whole evaporative crystallization device 90080-95%, and reduces the energy consumption of the whole calcium carbonate treatment wastewater system by 70%.
2. The softening device 100 generates a large amount of sludge such as calcium carbonate for repeated utilization, and the process for treating wastewater by recycling calcium carbonate avoids the problem of higher operation cost caused by excessive addition of medicament on one hand, and reduces the treatment cost of sludge on the other hand.
3. The utility model discloses a heat that ripe fossil ash produced does not have secondary pollution in the calcium carbonate treatment wastewater method, has realized effective recycle, when reducing carbon emission, utilizes carbon dioxide recovery to adjust pH, reduces the system running cost.
4. The utility model discloses a calcium carbonate treatment wastewater method has realized effective recycle mud, reduces system's running cost.
5. The utility model discloses a calcium carbonate treatment wastewater method whole in-process does not have the outer row of pollutants such as mud, waste liquid, has realized waste water treatment resource cyclic utilization completely.
Example 1
The embodiment provides a method for treating wastewater by recycling calcium carbonate.
A method for recycling calcium carbonate to treat wastewater comprises the following steps:
referring to fig. 1 and 2, the high hardness and high alkalinity wastewater enters a softening device 100, and a calcium hydroxide solution with a concentration of 3-6% is added into the softening device 100 to be stirred and reacted to form a turbid solution; the reaction time was stirred for 10min at a stirring speed of 100 rpm.
The turbid liquid enters the precipitation device 200 through an overflow port for precipitation, solid-liquid separation is realized to form precipitate and supernatant, the retention time of the precipitation device 200 is 45min, the precipitate enters the sludge dewatering device 400 through the sludge pump 202 for dewatering treatment to obtain sludge, and the water content of the sludge after dewatering is 65-75%.
The supernatant enters the clarifying device 300 through an overflow port, carbon dioxide is introduced into the clarifying device 300 to adjust the pH value to 7.0-8.3, the supernatant enters the filtering device 500 through a water inlet pump of the filtering device 500 to carry out solid-liquid deep separation and partial removal of COD, and the turbidity of the effluent of the clarifying device 300 is less than 2 NT.
The sludge (main component calcium carbonate) with the water content of 65-75 percent generated by the sludge dewatering device 400 is conveyed to a vibration feeder of a calcium carbonate calcining device 700 through a belt conveyor and then enters a calcining furnace of the calcium carbonate calcining device 700 for calcining, the calcining temperature of the calcium carbonate calcining device 700 is 600 ℃, and CO generated by calcining is calcined2The calcium oxide enters a cyclone dust collector 702 to be collected and conveyed to a clarifying device 300, after the calcium oxide generated by calcination is cooled and enters a finished product bin, a part of the calcium oxide is conveyed to a calcium oxide curing device 800 through an ash discharging conveying device, and a part of the calcium oxide is packaged and sold.
Calcium oxide generated by the calcium carbonate calcining device 700 enters the calcium oxide curing device 800, the calcium oxide and water in the calcium oxide curing device 800 are cured and released to generate calcium hydroxide, the heat generated by the calcium carbonate calcining device 700 is collected by a heat collector and then transmitted to the evaporative crystallization device 900, and the calcium hydroxide generated by the calcium oxide curing device 800 is transmitted to the softening device 100.
The effluent of the filtering device 500 directly enters the membrane concentration device 600 through a water inlet pump of the membrane concentration device 600, the turbidity of the effluent of the filtering device 500 is less than 2NTU, and the TDS is concentrated to 170000mg/L by medium-high pressure reverse osmosis; the water produced by the membrane concentration device 600 enters the water production device 1000 and then enters the calcium oxide curing device 800 for calcium oxide curing, and the redundant produced water reaches the standard and is discharged or recycled. The concentrated water of the membrane concentration device 600 enters the evaporation crystallization device 900, the evaporation crystallization device 900 evaporates the concentrated water to generate crystallized salt, the evaporation heat source of the evaporation crystallization device 900 comes from the heat generated by the calcium oxide curing device 800, and the evaporation temperature of the evaporation crystallization device 900 is 150 ℃.
In the embodiment, after the treatment, hardness and alkalinity in the wastewater are basically removed by adding calcium hydroxide, carbon dioxide generated by calcining the generated calcium carbonate precipitate is used for adjusting the pH of the supernatant in the clarifying device 300, heat generated by heat release and curing is introduced into the calcined calcium oxide, the heat is collected and used as a heat source of the evaporative crystallization device 900, then the generated calcium hydroxide feed liquid is added into a softening system to remove the alkalinity and hardness, concentrated water after membrane concentration enters the evaporative crystallization device 900 to generate crystallized salt, finally the whole process is recycled, and no wastewater or sludge is discharged in the process.
Example 2
The method for treating wastewater by recycling calcium carbonate in example 1 is used for treating high-hardness and high-alkalinity wastewater of a chemical industry enterprise, and specifically comprises the following steps:
the water quality condition of high-hardness and high-alkalinity wastewater combined with a certain chemical enterprise is as follows: 13000mg/L, Ca TDS2+＝750mg/L、Mg2+45mg/L, 1500mg/L, Na total alkalinity+＝25106.9mg/L、 Cl-＝112240.4mg/L、SO4 2-＝364.1mg/L。
Referring to fig. 1 and 2, the high hardness and high alkalinity wastewater enters the softening device 100, and the volume of the softening device 100 is 3m3The inflow rate is 10m3And h, adding a 3% calcium hydroxide solution into the softening device 100 to control the pH value of the high-hardness and high-alkalinity wastewater to be 10.8-11.2, and stirring for reaction for 10min at a stirring speed of 100rpm to form a turbid solution.
The turbid liquid enters the precipitation device 200 through an overflow port for precipitation to realize solid-liquid separation to form precipitate and supernatant, and the volume of the turbid liquid entering the precipitation device 200 is 10m3The residence time of the sedimentation device 200 is 45min, the sediment enters the sludge dewatering device 400 through the sludge pump 202 to be dewatered to obtain sludge, the sludge enters the filter press to be filter-pressed and dewatered, the water content of the sludge after dewatering is 65-75%, the processing capacity of the filter press is 1.2t/h, the working pressure is 1.5MPa, and the filtering area is 60m2CaCO, dewatered sludge3The content is more than or equal to 95 percent.
The supernatant enters a clarifying device 300 through an overflow port, carbon dioxide is introduced into the clarifying device 300 to adjust the pH value to 8.3-7.0, the mixture is stirred at the speed of 150rpm, and the volume of the clarifying device 300 is 5m3The retention time of the supernatant in the clarifying device 300 was 1.5h, and the pH of the clarified supernatant was 8.0 and Ca2+：42.5mg/L、 Mg2+: 1.3mg/L and 5NTU turbidity, and the clarified supernatant enters the filter device 500 through the water inlet pump of the filter device 500 for solid-liquid deep separation and partial COD removal.
The sludge (calcium carbonate) with the water content of 65-75% generated by the sludge dewatering device 400 is conveyed to a vibration feeder of a calcium carbonate calcining device 700 through a belt conveyor and then enters a calcining furnace of the calcium carbonate calcining device 700 for calcining, the calcining temperature of the calcium carbonate calcining device 700 is 600 +/-30 ℃ for 45min, the reaction efficiency is more than 95%, and CO is generated2The purity was 85% at 3.3kg/h, and CaO was produced at 4.2kg/h and the purity was 95% or more. CO produced by calcination2Enters a cyclone dust collector 702 to be collected and conveyed to a clarifying device 300, and after calcium oxide generated by calcination is cooled, the calcium oxide enters a finished product bin and then is conveyed to a calcium oxide curing system through an ash discharging conveying device.
Calcium oxide generated by the calcium carbonate calcining device 700 enters the calcium oxide curing device 800, the calcium oxide and water in the calcium oxide curing device 800 are cured and released to generate calcium hydroxide, the heat generated by the calcium carbonate calcining device 700 is collected by a heat collector and then transmitted to the evaporative crystallization device 900, and the calcium hydroxide generated by the calcium oxide curing device 800 is transmitted to the softening device 100.
The filtering apparatus 500 is provided with 6 effective membranes 77m2The ultrafiltration concentrated water of the filter device 500 flows back to the clarifying device 300, the effluent of the filter device 500 directly enters the membrane concentration device 600 through the water inlet pump of the membrane concentration device 600, the turbidity of the effluent of the filter device 500 is less than 0.5NTU, and the TDS is concentrated to 170000mg/L by medium-high pressure reverse osmosis; when the medium-high pressure reverse osmosis is concentrated, the medium-high pressure reverse osmosis has 18 membranes and the operating pressure is 4.5MPa, the high pressure reverse osmosis has 4 membranes and the operating pressure is 12MPa, and the recovery rate of the medium-high pressure reverse osmosis is 85 percent.
The water produced by the membrane concentration device 600 enters the water production device 1000, and the volume of the water production device 1000 is 25m2The pH value of the produced water is 6-9 and Ca2+：10mg/L、Mg2+: 2mg/L, TDS is 1000mg/L, the water produced in the water producing device 1000 enters the calcium oxide curing device 800 for calcium oxide curing, and the redundant water produced reaches the standard and is discharged or recycled. 1kg of calcium oxide reacts with the produced water to release 1160J heat, the produced steam 477.69kg enters an evaporative crystallization device 900, the curing speed is 5.55kg/h, and Ca (OH) is produced by curing2Into the softening unit 100.
The concentrated water with the TDS of 170000mg/L of the membrane concentration device 600 enters the evaporation crystallization device 900, the evaporation crystallization device 900 evaporates the concentrated water to generate crystal salt, and the heat exchange area of the evaporation crystallization device 900 is 150m2Diameter of forced circulation evaporator of evaporative crystallization apparatus 900 is 3.8m2The diameter of the crystallizer of the evaporative crystallization apparatus 900 is 3.8m2To give a crystalline salt of 0.25m2H is used as the reference value. The evaporation heat source of the evaporative crystallization device 900 is derived from the heat generated by the calcium oxide slaking device 800, and the evaporation temperature of the evaporative crystallization device 900 is 150 ℃.
In the embodiment, a large amount of calcium carbonate sludge generated by the softening device 100 is recycled, and a comparison between table 1 and table 2 shows that the method for treating wastewater by recycling calcium carbonate in the embodiment avoids the problem of high operation cost caused by excessive addition of a medicament on one hand, and reduces the treatment cost of sludge on the other hand. Compared with the traditional process, the calcium carbonate wastewater treatment method only adds the calcium carbonate calcining device 700 and the calcium oxide curing device 800, the investment cost is only increased by about 15-20 ten thousand yuan, but the annual treatment cost is lower than that of the traditional process by about 27.02 ten thousand yuan, and the cost is relatively obviously reduced.
Table 1: running cost of traditional process
Table 2: example 2 method for treating wastewater by recycling calcium carbonate
This embodiment is mainly directed to TDS 13000mg/L, Ca2+＝750mg/L、Mg2+The high hardness and high alkalinity waste water with total alkalinity of 45mg/L and 1500mg/L is treated through adding slaked lime (Ca (OH) into the softening apparatus 1002) The water is removed hardness and alkalinity, and then enters the filtering device 500 to remove suspended matters and part of COD, and then enters the membrane concentration device 600 to further concentrate various components and separate components by a membrane method, and then enters the evaporation crystallization device 900 to be evaporated to generate crystallized salt. The heat energy required by the evaporation crystallization device 900 enters the calcium carbonate calcination device 700 through the calcium carbonate precipitate generated by the device 100 to be calcined to generate calcium oxide, the calcium oxide enters the calcium oxide curing device 800 to react with water to generate a large amount of heat to be used as a heat source of the evaporation crystallization device 900, the energy is recycled, and carbon dioxide generated in the calcination process enters the clarification device 300 to adjust the pH value. Ripening produced by calcium oxide ripening apparatus 800Lime is returned to the softening unit 100 and dosed as a de-hardening agent. After the treatment method, the hardness and alkalinity in the wastewater are basically removed by adding calcium hydroxide, the generated carbon dioxide generated by calcining the calcium carbonate precipitate is used for adjusting the pH value, the calcium oxide generated by calcining is introduced into heat generated by heat release curing and collected to be used as a heat source of the evaporative crystallization device 900, the generated calcium hydroxide feed liquid is added into the softening device 100 for removing the alkalinity and the hardness, the concentrated water after membrane concentration enters the evaporative crystallization device 900 to generate crystal salt, finally the whole process realizes cyclic utilization, and no wastewater or sludge is discharged in the process.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The utility model provides a cyclic utilization calcium carbonate treatment wastewater system, its characterized in that, includes softening installation, deposits device, clarification device, sludge dewatering device, filter equipment, membrane enrichment facility, calcium carbonate calcining device, calcium oxide curing device and evaporation crystallization device, softening installation, precipitation device, clarification device, filter equipment, membrane enrichment facility and evaporation crystallization device connect gradually in proper order, sludge dewatering device with it connects to deposit the device, calcium oxide curing device with softening installation connects, calcium carbonate calcining device respectively with sludge dewatering device with clarification device calcium oxide curing device connects.
2. The system for recycling calcium carbonate-treated wastewater according to claim 1, further comprising a water-producing device connected to the membrane concentration device.
3. The system for recycling calcium carbonate wastewater according to claim 2, wherein the water production device is further connected to the calcium oxide slaking device for slaking calcium oxide.
4. The system for recycling calcium carbonate wastewater according to claim 3, wherein the calcium oxide slaking apparatus comprises a slaking feed water pump, a slaker and a limestone feed pump, the slaker is connected with the water production apparatus through the slaking feed water pump, and the slaker is connected with the calcium carbonate calcining apparatus through the limestone feed pump.
5. The system for recycling calcium carbonate wastewater according to any one of claims 1 to 4, wherein the calcium carbonate calcining device comprises a calcium carbonate calcining furnace and a cyclone dust collector, the calcium carbonate calcining furnace is connected with the clarifying device through the cyclone dust collector, and the cyclone dust collector is used for collecting CO generated in the calcining process of the calcium carbonate calcining furnace2And is conveyed to the clarifying device after dust removal.
6. The system for recycling calcium carbonate wastewater according to any one of claims 1 to 4, further comprising a finished product bin, wherein the finished product bin is connected with the calcium carbonate calcining device, and calcium oxide generated by calcining in the calcium carbonate calcining device enters the finished product bin after being cooled.
7. The system for recycling calcium carbonate wastewater according to claim 6, wherein at least one ash discharge conveying device is arranged between the finished product bin and the calcium oxide curing system, and the ash discharge conveying device is used for conveying part of calcium oxide into the calcium oxide curing system.
8. The system for recycling calcium carbonate wastewater according to any one of claims 1 to 4, further comprising a heat collector disposed on the calcium oxide slaking device, wherein the heat collector is used for collecting heat generated by slaking the calcium oxide and transferring the heat to the evaporative crystallization device.
9. The system for recycling calcium carbonate wastewater according to any one of claims 1 to 4, wherein the filtration device is an ultrafiltration module.
10. The system for recycling calcium carbonate to treat wastewater according to any one of claims 1 to 4, wherein the sludge dewatering device comprises a plate-and-frame filter press and a plate-and-frame discharge pump, the plate-and-frame filter press is connected with the precipitation device, and the plate-and-frame filter press is further connected with the calcium carbonate calcination device through the plate-and-frame discharge pump.
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| CN111762941A (en) * | 2020-05-28 | 2020-10-13 | 内蒙古久科康瑞环保科技有限公司 | System and method for treating wastewater by recycling calcium carbonate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111762941A (en) * | 2020-05-28 | 2020-10-13 | 内蒙古久科康瑞环保科技有限公司 | System and method for treating wastewater by recycling calcium carbonate |
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