CN215886607U - Low-cost resourceful coprocessing system of negative hardness waste water - Google Patents
Low-cost resourceful coprocessing system of negative hardness waste water Download PDFInfo
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- CN215886607U CN215886607U CN202121482984.3U CN202121482984U CN215886607U CN 215886607 U CN215886607 U CN 215886607U CN 202121482984 U CN202121482984 U CN 202121482984U CN 215886607 U CN215886607 U CN 215886607U
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- 238000000746 purification Methods 0.000 claims abstract description 74
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 47
- 238000005342 ion exchange Methods 0.000 claims abstract description 44
- 239000002699 waste material Substances 0.000 claims abstract description 40
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 39
- 230000008929 regeneration Effects 0.000 claims abstract description 36
- 238000011069 regeneration method Methods 0.000 claims abstract description 36
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011575 calcium Substances 0.000 claims abstract description 16
- 239000003814 drug Substances 0.000 claims abstract description 11
- 230000002195 synergetic effect Effects 0.000 claims abstract description 8
- 238000001223 reverse osmosis Methods 0.000 claims description 78
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- 238000004062 sedimentation Methods 0.000 claims description 42
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 32
- 238000004140 cleaning Methods 0.000 claims description 32
- 150000002500 ions Chemical class 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
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- 238000001914 filtration Methods 0.000 claims description 13
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 12
- 239000000920 calcium hydroxide Substances 0.000 claims description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
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- 239000000084 colloidal system Substances 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 6
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- 230000000694 effects Effects 0.000 claims description 6
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- 238000001728 nano-filtration Methods 0.000 claims description 5
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- 238000012805 post-processing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000002244 precipitate Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
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- 239000012141 concentrate Substances 0.000 abstract 1
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- 239000002033 PVDF binder Substances 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
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- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003729 cation exchange resin Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
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- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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- 239000013522 chelant Substances 0.000 description 1
- 229920001429 chelating resin Polymers 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The utility model provides a low-cost recycling cooperative treatment system for negative hardness wastewater, which comprises a primary mine wastewater purification and concentration system, an ion exchange softening system, a secondary mine wastewater purification and concentration system and a cooperative treatment system; the first-stage mine wastewater purification and concentration system purifies, concentrates and reduces mine wastewater for one time, the ion exchange softening system exchanges calcium and magnesium ions in the concentrated water of the first-stage mine wastewater purification and concentration system with ion exchange groups of resin so as to realize softening, and the cooperative treatment system mixes the concentrated water subjected to secondary purification, concentration and reduction of the second-stage mine wastewater purification and concentration system with desulfurization wastewater for cooperative softening and purification treatment. The utility model aims to solve the problems of large dosage and high energy consumption in single-line treatment of the negative-hardness mine water, the mine wastewater is softened by adopting an ion exchange method to reserve bicarbonate, and then the mine wastewater, the desulfurization wastewater and the resin regeneration waste liquid are subjected to synergistic treatment, so that the resource recycling of the bicarbonate is realized, the medicament cost is reduced, and the economic benefit is increased.
Description
Technical Field
The utility model relates to the technical field of water treatment, in particular to a low-cost recycling cooperative treatment system for negative-hardness wastewater.
Background
In recent years, national environmental protection policies are increasingly strict, the investment of thermal power enterprises and coal production enterprises in the aspect of up-to-standard discharge of sewage and wastewater is continuously increased, and particularly, local governments are required to realize zero-discharge treatment of wastewater in provinces such as inner Mongolia autonomous regions and the like. Therefore, the desulfurization wastewater zero-discharge project of the thermal power enterprise and the mine water zero-discharge project of the coal enterprise fall on the ground.
For coal-electricity integrated enterprises, as power plants and coal mines are constructed closely, wastewater sources also comprise desulfurization wastewater, mine water and the like. Calcium ions, magnesium ions and sulfate ions in the desulfurization wastewater are often higher, and bicarbonate ions and sulfate ions in mine water are often higher. In the past, aiming at wastewater treatment projects of various water sources, single-line treatment processes are mainly used, namely, a treatment process route is designed for wastewater, and the treatment process route does not intersect with each other. According to a conventional single-line treatment mode, a large amount of calcium hydroxide is required to be added for precipitating magnesium ions during the softening treatment of the desulfurization wastewater, and then a large amount of sodium carbonate is added for removing residual calcium ions; a large amount of hydrochloric acid or sulfuric acid is required to be added into the mine water, and redundant bicarbonate radicals are decomposed into carbon dioxide and water; then adding proper amount of calcium hydroxide or sodium hydroxide to precipitate calcium and magnesium ions. According to the treatment mode, a large amount of chloride ions or sulfate ions are introduced into the mine water treatment system, the salt content of wastewater is increased, the softening effect is difficult to control, the equipment corrosion resistance level is high, the energy consumption and the chemical consumption are high, and the operation cost is high.
The single-line treatment mode usually takes the components in the wastewater as the objects of pollution treatment, additionally increases treatment facilities and medicament consumption, neglects the cooperative treatment of multiple wastewater sources, and can play the roles of self-reaction of the components in the wastewater, waste stopping and resource recycling.
The prior art has the following defects:
1. the desulfurization wastewater and mine water single-line treatment mode enables a large amount of hydrochloric acid or sulfuric acid to be added into a mine water treatment system to decompose bicarbonate, a large amount of chloride ions or sulfate ions are introduced into a wastewater water body, the salt content of the wastewater is increased, and the corrosion resistance grade of equipment of the water treatment system is improved; the energy consumption required for overcoming osmotic pressure is increased; the adding cost of the medicament is high.
2. By adopting a single-wire treatment mode, the mine water treatment system treats the bicarbonate as a pollution factor to decompose, so that the bicarbonate in the mine water cannot be recycled in the desulfurization wastewater treatment system.
3. A single-wire type treatment mode is adopted, carbonate and bicarbonate in a mine water treatment system form a buffer system, redundant bicarbonate is firstly decomposed, a proper amount of calcium hydroxide or sodium hydroxide is added to precipitate calcium ions and magnesium ions, the reaction end point and the dosing amount are not easy to accurately control, the wastewater is not softened thoroughly, and the stable operation of a subsequent treatment system is influenced.
Therefore, a treatment system which has low equipment cost and stable system operation and can realize the resource recycling of sodium carbonate is needed.
Disclosure of Invention
The utility model aims to solve the problems of large dosage and high energy consumption in single-line treatment of negative-hardness mine water, and provides a low-cost recycling cooperative treatment system for negative-hardness wastewater.
The utility model provides a low-cost recycling cooperative treatment system for negative hardness wastewater, which comprises a primary mine wastewater purification and concentration system, an ion exchange softening system, a secondary mine wastewater purification and concentration system and a cooperative treatment system which are sequentially connected;
the first-stage mine wastewater purification and concentration system is used for purifying, concentrating and reducing mine wastewater for the first time, the ion exchange softening system is used for exchanging calcium and magnesium ions in concentrated water of the first-stage mine wastewater purification and concentration system with ion exchange groups of resin to realize the function of softening the wastewater, the second-stage mine wastewater purification and concentration system is used for purifying, concentrating and reducing softened first-stage mine wastewater concentrated solution of the ion exchange softening system for the second time, and the cooperative treatment system is used for mixing concentrated water of the second-stage mine wastewater purification and concentration system with desulfurization wastewater to perform cooperative softening and purification treatment;
the ion exchange softening system comprises an ion exchanger connected with a water outlet of the primary mine wastewater purification and concentration system and a regeneration waste liquid treatment system connected with a regeneration waste liquid outlet of the ion exchanger, a water inlet of the regeneration waste liquid treatment system is connected with a concentrated water outlet of the secondary mine wastewater purification and concentration system, the ion exchanger is used for exchanging calcium and magnesium ions in concentrated water of the primary mine wastewater purification and concentration system with ion exchange groups of resin to realize the function of softening wastewater, and the regeneration waste liquid treatment system is used for removing calcium and magnesium ions through precipitation under the action of bicarbonate and sulfate radicals in concentrated water of the secondary mine wastewater purification and concentration system with the resin regeneration waste liquid generated by the ion exchanger.
The utility model relates to a low-cost recycling cooperative treatment system for negative-hardness wastewater, which is characterized in that as a preferred mode, the cooperative treatment system comprises an inclined plate sedimentation tank, a triple box and a tubular ultrafiltration membrane which are sequentially connected, wherein a water inlet of the inclined plate sedimentation tank and a water inlet of the triple box are connected with a concentrated water outlet of a secondary mine wastewater purification and concentration system;
the inclined plate sedimentation tank is used for uniformly mixing concentrated water of the secondary mine wastewater purification and concentration system with desulfurization wastewater, then precipitating and removing magnesium ions, calcium ions, silicon dioxide and sulfate radicals under the action of sulfate radicals and agents in the concentrated water of the secondary mine wastewater purification and concentration system, and removing colloid particles, suspended matters and partial organic matters, the triple box is used for uniformly mixing the concentrated water of the secondary mine wastewater purification and concentration system with supernatant of the inclined plate sedimentation tank, then precipitating residual magnesium ions, calcium ions and silicon dioxide under the action of bicarbonate radicals and agents in the concentrated water of the secondary mine wastewater purification and concentration system, and the tubular ultrafiltration membrane is used for filtering effluent of the triple box in a circulating cross flow manner.
The utility model relates to a low-cost recycling cooperative treatment system for negative-hardness wastewater, which is characterized in that as an optimal mode, a primary mine wastewater purification and concentration system comprises a V-shaped filter tank, a primary self-cleaning filter, a primary ultrafiltration device and a primary reverse osmosis device which are sequentially connected, wherein a concentrated water outlet of the primary reverse osmosis device is connected with a water inlet of an ion exchanger;
the V-shaped filter tank is used for removing colloid particles, suspended matters and partial organic matters in the mine wastewater, the primary self-cleaning filter is used for removing fine suspended matters in the mine wastewater, the primary ultrafiltration device is used for filtering fine suspended matters in the mine wastewater to delay membrane pollution of the primary reverse osmosis device, and the primary reverse osmosis device is used for concentrating the mine wastewater.
According to the low-cost recycling cooperative treatment system for negative-hardness wastewater, as a preferred mode, a buffer tank is arranged between a water production port of a primary ultrafiltration device and a water inlet of a primary reverse osmosis device, the water production port of the primary ultrafiltration device is connected with the water inlet of the primary reverse osmosis device through the buffer tank, and the buffer tank is provided with a medicine adding port for adjusting pH.
The utility model relates to a low-cost recycling cooperative treatment system for negative-hardness wastewater, which is characterized in that as an optimal mode, a secondary mine wastewater purification and concentration system comprises a secondary self-cleaning filter, a secondary ultrafiltration device and a secondary reverse osmosis device which are sequentially connected, wherein a water inlet of the secondary self-cleaning filter is connected with a water outlet of an ion exchanger;
the secondary self-cleaning filter is used for removing fine suspended matters in the effluent of the ion exchange softening system, the secondary ultrafiltration device is used for filtering the fine suspended matters in the effluent of the ion exchange softening system so as to delay membrane pollution of the secondary reverse osmosis device, and the secondary reverse osmosis device is used for concentrating the effluent of the ion exchange softening system.
The low-cost recycling cooperative treatment system for negative-hardness wastewater, disclosed by the utility model, is used as an optimal mode, and a concentrated water outlet of the secondary reverse osmosis device is respectively connected with a water inlet of a regeneration waste liquid treatment system, a water inlet of an inclined plate sedimentation tank and a water inlet of a triple box;
the second-stage reverse osmosis device is used for conveying concentrated water to the inclined plate sedimentation tank, the regeneration waste liquid treatment system and the triple box.
According to the low-cost recycling cooperative treatment system for negative-hardness wastewater, as a preferred mode, a buffer tank is arranged between a water production port of a secondary ultrafiltration device and a water inlet of a secondary reverse osmosis device, a water production port of the secondary ultrafiltration device is connected with the water inlet of the secondary reverse osmosis device through the buffer tank, and the buffer tank is provided with a medicine adding port for adjusting pH.
The utility model relates to a low-cost recycling cooperative treatment system for negative-hardness wastewater, which is characterized in that as an optimal mode, a tilted plate sedimentation tank is provided with a calcium hydroxide feeding port, and a triple box is provided with a sodium hydroxide and sodium carbonate feeding port;
and a supernatant outlet of the regeneration waste liquid treatment system is connected with a water inlet of the inclined plate sedimentation tank.
According to the low-cost recycling cooperative treatment system for negative-hardness wastewater, as an optimal mode, a water outlet of a circulating pipeline of a tubular ultrafiltration membrane is connected with a water inlet of a triple box concentration tank, and chemical precipitation sludge, colloidal particles and suspended matters intercepted by the tubular ultrafiltration membrane are conveyed to a triple box through a return pipeline to form a circulating cross-flow filtration system.
The utility model relates to a low-cost recycling cooperative treatment system for negative-hardness wastewater, which comprises a preferable mode, wherein the cooperative treatment system also comprises a subsequent treatment unit connected with a water production outlet of a tubular ultrafiltration membrane, and the subsequent treatment unit comprises any one or more of the following components: a nanofiltration device, a high-pressure reverse osmosis device and an evaporative crystallization device.
The mine wastewater with negative hardness is lifted to the V-shaped filter tank through a water pump, and the effects of removing colloid particles, suspended matters and partial organic matters in the wastewater are achieved. The water produced by the V-shaped filter chamber is lifted to a first-level self-cleaning filter by a water pump, the effect of removing fine suspended matters in the wastewater is achieved, the filtering precision of the first-level self-cleaning filter is less than or equal to 100 mu m, and a motor-driven suction type self-cleaning filter is preferred. The water produced by the first-stage self-cleaning filter is conveyed to the first-stage ultrafiltration to remove fine suspended matters in the wastewater and delay the pollution of the reverse osmosis membrane, an external pressure type ultrafiltration membrane or an immersed type ultrafiltration membrane can be adopted, the external pressure type ultrafiltration membrane is preferably selected, and PVDF is preferably selected as the material of the ultrafiltration membrane. After the primary ultrafiltration produced water is collected, the PH value is adjusted to 7.5-8.0, the water is conveyed to primary reverse osmosis through a water pump to play a role in concentration and reduction, a low-pressure pollution-resistant rolled reverse osmosis membrane is adopted, the recovery rate can be designed to be 70% -75%, and a scale inhibitor is considered to be added according to the scaling tendency of calcium carbonate, magnesium carbonate, calcium sulfate, magnesium sulfate, calcium fluoride, barium sulfate and the like. And collecting the first-stage reverse osmosis produced water for reuse, and conveying the first-stage reverse osmosis concentrated water to the ion exchanger through a water pump.
The filling resin of the ion exchanger is chelating resin, the type of the filling resin is weak acid type cation exchange resin, the running flow rate is 25m/h, the downstream acid-base regeneration mode and the regeneration period are 24h, and the active groups in the resin are utilized to exchange with calcium and magnesium ions in the wastewater, so that the effects of removing the calcium and magnesium ions in the wastewater, softening the wastewater and retaining bicarbonate are achieved. The regeneration waste liquid treatment system is used for precipitating calcium ions and magnesium ions absorbed by the resin from the waste water in the regeneration waste liquid, and after the chemical sludge is precipitated and filtered, the supernatant is conveyed to the inclined plate sedimentation tank.
The water produced by the ion exchanger is lifted by a water pump to play a role in removing fine suspended matters in the wastewater, the filtering precision of the secondary self-cleaning filter is less than or equal to 100 mu m, and a motor-driven suction type self-cleaning filter is preferred. And the produced water of the secondary self-cleaning filter is conveyed to secondary ultrafiltration to remove fine suspended matters in the wastewater and delay the pollution of the reverse osmosis membrane, an external pressure type ultrafiltration membrane or an immersed type ultrafiltration membrane can be adopted, the external pressure type ultrafiltration membrane is preferably selected, and PVDF is preferably selected as the material of the ultrafiltration membrane. After the second-stage ultrafiltration produced water is collected, the PH value is adjusted to 7.5-8.0, the water is conveyed to the second-stage reverse osmosis by a water pump to play a role in concentration and reduction, an anti-pollution roll type reverse osmosis membrane is adopted, the recovery rate can be designed to be 70% -80%, and when the high recovery rate is selected, the scale inhibitor is considered to be added. Collecting and recycling secondary reverse osmosis produced water, conveying the secondary reverse osmosis concentrated water to a regeneration waste liquid treatment system, an inclined plate sedimentation tank and a triple box in proportion, determining the distribution proportion according to the precipitation reaction of calcium ions, magnesium ions, sulfate radicals, bicarbonate radicals and hydroxyl radicals in a waste water system, preferentially selecting bicarbonate radicals and sulfate radicals in the secondary reverse osmosis concentrated water to be supplemented in the regeneration waste liquid treatment system, and meeting the requirement of carbonate radicals and sulfate radicals required by the precipitation of calcium ions and magnesium ions in the resin regeneration waste liquid; secondly, sulfate radicals in the second-stage reverse osmosis concentrated water are supplemented in the inclined plate sedimentation tank, so that after calcium hydroxide is added into the inclined plate sedimentation tank, the ratio of the sum of the mole numbers of the sulfate radicals and carbonate radicals in the wastewater to the mole number of calcium ions is 1: 1, ensuring the maximum precipitation of calcium ions; and (3) conveying the residual second-stage reverse osmosis concentrated water to a triple box, mainly supplementing bicarbonate in the second-stage reverse osmosis concentrated water for precipitating residual calcium ions in the produced water of the inclined plate sedimentation tank, and if the bicarbonate in the residual second-stage reverse osmosis concentrated water is not more than the residual calcium ions in the produced water of the complete precipitation inclined plate sedimentation tank, precipitating the residual calcium ions by supplementing extra sodium carbonate.
The desulfurization wastewater is lifted to an inclined plate sedimentation tank through a water pump, concentrated water of a second-stage reverse osmosis part and the desulfurization wastewater are fully mixed in the inclined plate sedimentation tank, calcium hydroxide is added into the inclined plate sedimentation tank, the purity of the calcium hydroxide is preferably higher than 85%, the molar ratio of the added calcium hydroxide to magnesium ions in the wastewater is 1-1.5, the pH is controlled to be 10.5-12, the calcium ions, the magnesium ions, silicon dioxide and sulfate radicals are precipitated, and colloidal particles, suspended matters and part of organic matters in the wastewater are removed. Lifting the water produced by the inclined plate sedimentation tank to a triple box through a water pump, fully mixing the water produced by the inclined plate sedimentation tank and the secondary reverse osmosis residual concentrated water in the triple box, adding sodium hydroxide and sodium carbonate into the triple box, controlling the pH value to be 11-12 by adding the sodium hydroxide, and precipitating calcium ions, magnesium ions and a small amount of silicon dioxide. If the bicarbonate in the residual second-stage reverse osmosis concentrated water is sufficient, sodium carbonate does not need to be added; if the residual calcium ions in the water produced by the complete precipitation inclined plate sedimentation tank are not enough, the residual calcium ions are precipitated by supplementing additional sodium carbonate. The effluent of the triple box is conveyed to a tubular ultrafiltration membrane through a high-flow circulating pump, chemical precipitation sludge, colloidal particles and suspended matters intercepted by the tubular ultrafiltration membrane are conveyed to the triple box through a return pipeline to form a circulating cross-flow filtration system, and the material of the tubular ultrafiltration membrane is preferably PVDF; and conveying the produced water filtered by the tubular ultrafiltration membrane to a subsequent treatment unit, wherein the subsequent treatment unit can comprise a nanofiltration device, a high-pressure reverse osmosis device, an evaporative crystallization device and the like, and finally realizing zero-emission treatment.
The utility model has the following advantages:
(1) the wastewater is softened by adopting an ion exchange method, so that a large amount of chloride ions or sulfate ions are prevented from being introduced, and the corrosion resistance grade of equipment of a zero-emission system can be reduced; the energy consumption for overcoming osmotic pressure is reduced; the adding cost of the medicament is reduced.
(2) And the wastewater is softened by adopting an ion exchange method, so that the influence caused by a buffer system consisting of carbonate and bicarbonate caused by dosing treatment is avoided, and the running stability of the system is ensured.
(3) And the desulfurization wastewater and the mine water are subjected to cooperative treatment, so that the resource recycling of bicarbonate is realized, the adding cost of the medicament is reduced, and the economic benefit is increased.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of a low-cost recycling cooperative treatment system for negative-hardness wastewater;
FIG. 2 is a schematic structural diagram of an embodiment 2 and 3 of a low-cost recycling cooperative treatment system for negative-hardness wastewater.
Reference numerals:
1. a first-stage mine wastewater purification and concentration system; 11. a V-shaped filter chamber; 12. a primary self-cleaning filter; 13. a primary ultrafiltration device; 14. a first-stage reverse osmosis device; 2. an ion exchange softening system; 21. an ion exchanger; 22. a regeneration waste liquid treatment system; 3. a secondary mine waste water purification and concentration system; 31. a secondary self-cleaning filter; 32. a secondary ultrafiltration device; 33. a secondary reverse osmosis device; 4. a co-processing system; 41. a sloping plate sedimentation tank; 42. A triple header; 43. a tubular ultrafiltration membrane; 44. and a subsequent processing unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, a low-cost recycling cooperative treatment system for negative-hardness wastewater comprises a primary mine wastewater purification and concentration system 1, an ion exchange softening system 2, a secondary mine wastewater purification and concentration system 3 and a cooperative treatment system 4 which are connected in sequence;
the first-stage mine wastewater purification and concentration system 1 is used for purifying, concentrating and reducing mine wastewater for the first time, the ion exchange softening system 2 is used for exchanging calcium and magnesium ions in concentrated water of the first-stage mine wastewater purification and concentration system 1 with ion exchange groups of resin to realize the function of softening the wastewater, the second-stage mine wastewater purification and concentration system 3 is used for purifying, concentrating and reducing softened first-stage mine wastewater concentrated solution of the ion exchange softening system 2 for the second time, and the synergistic treatment system 4 is used for mixing concentrated water of the second-stage mine wastewater purification and concentration system 3 with desulfurization wastewater to carry out synergistic softening and purification treatment;
the ion exchange softening system 2 comprises an ion exchanger 21 connected with the water outlet of the primary mine wastewater purification and concentration system 1 and a regeneration waste liquid treatment system 22 connected with the regeneration waste liquid outlet of the ion exchanger 21, the water inlet of the regeneration waste liquid treatment system 22 is connected with the concentrated water outlet of the secondary mine wastewater purification and concentration system 3, the ion exchanger 21 is used for exchanging calcium and magnesium ions in the concentrated water of the primary mine wastewater purification and concentration system 1 with ion exchange groups of resin to realize the function of softening the wastewater, and the regeneration waste liquid treatment system 22 is used for precipitating and removing calcium and magnesium ions from the resin regeneration waste liquid generated by the ion exchanger 21 under the action of bicarbonate and sulfate radicals in the concentrated water of the secondary mine wastewater purification and concentration system 3.
Example 2
As shown in fig. 2, a low-cost recycling cooperative treatment system for negative-hardness wastewater comprises a primary mine wastewater purification and concentration system 1, an ion exchange softening system 2, a secondary mine wastewater purification and concentration system 3 and a cooperative treatment system 4 which are connected in sequence;
the first-stage mine wastewater purification and concentration system 1 is used for purifying, concentrating and reducing mine wastewater for the first time, the ion exchange softening system 2 is used for exchanging calcium and magnesium ions in concentrated water of the first-stage mine wastewater purification and concentration system 1 with ion exchange groups of resin to realize the function of softening the wastewater, the second-stage mine wastewater purification and concentration system 3 is used for purifying, concentrating and reducing softened first-stage mine wastewater concentrated solution of the ion exchange softening system 2 for the second time, and the synergistic treatment system 4 is used for mixing concentrated water of the second-stage mine wastewater purification and concentration system 3 with desulfurization wastewater to carry out synergistic softening and purification treatment;
the primary mine wastewater purification and concentration system 1 comprises a V-shaped filter tank 11, a primary self-cleaning filter 12, a primary ultrafiltration device 13 and a primary reverse osmosis device 14 which are connected in sequence, wherein a concentrated water outlet of the primary reverse osmosis device 14 is connected with a water inlet of an ion exchanger 21;
the V-shaped filter 11 is used for removing colloid particles, suspended matters and partial organic matters in the mine wastewater, the primary self-cleaning filter 12 is used for removing fine suspended matters in the mine wastewater, the primary ultrafiltration device 13 is used for filtering fine suspended matters in the mine wastewater to delay membrane pollution of the primary reverse osmosis device 14, and the primary reverse osmosis device 14 is used for concentrating the mine wastewater;
a buffer tank is arranged between the water producing port of the primary ultrafiltration device 13 and the water inlet of the primary reverse osmosis device 14, the water producing port of the primary ultrafiltration device 13 is connected with the water inlet of the primary reverse osmosis device 14 through the buffer tank, and the buffer tank is provided with a medicine adding port for adjusting pH;
the ion exchange softening system 2 comprises an ion exchanger 21 connected with the water outlet of the primary mine wastewater purification and concentration system 1 and a regenerated waste liquid treatment system 22 connected with the regenerated waste liquid outlet of the ion exchanger 21, the water inlet of the regenerated waste liquid treatment system 22 is connected with the concentrated water outlet of the secondary mine wastewater purification and concentration system 3, the ion exchanger 21 is used for mutually exchanging calcium and magnesium ions in the concentrated water of the primary mine wastewater purification and concentration system 1 with ion exchange groups of resin to realize the function of softening the wastewater, and the regenerated waste liquid treatment system 22 is used for precipitating and removing the calcium and magnesium ions from the resin regenerated waste liquid generated by the ion exchanger 21 under the action of bicarbonate and sulfate radicals in the concentrated water of the secondary mine wastewater purification and concentration system 3;
the cooperative treatment system 4 comprises an inclined plate sedimentation tank 41, a triple box 42, a tubular ultrafiltration membrane 43 and a subsequent treatment unit 44 connected with a water production outlet of the tubular ultrafiltration membrane 43 which are connected in sequence, wherein a water inlet of the inclined plate sedimentation tank 41 and a water inlet of the triple box 42 are connected with a concentrated water outlet of the secondary mine wastewater purification and concentration system 3;
the inclined plate sedimentation tank 41 is used for uniformly mixing concentrated water of the secondary mine wastewater purification and concentration system 3 with desulfurization wastewater, then removing magnesium ions, calcium ions, silicon dioxide and sulfate radicals under the action of sulfate radicals and agents in the concentrated water of the secondary mine wastewater purification and concentration system 3, and removing colloid particles, suspended matters and part of organic matters, the triple box 42 is used for uniformly mixing the concentrated water of the secondary mine wastewater purification and concentration system 3 with supernatant of the inclined plate sedimentation tank 41, then precipitating residual magnesium ions, calcium ions and silicon dioxide under the action of bicarbonate radicals and agents in the concentrated water of the secondary mine wastewater purification and concentration system 3, and the tubular ultrafiltration membrane 43 is used for filtering the effluent of the triple box 42 in a circulating cross flow manner;
the inclined plate sedimentation tank 41 is provided with a calcium hydroxide feeding port, and the triple box 42 is provided with a sodium hydroxide and sodium carbonate feeding port; the supernatant outlet of the regeneration waste liquid treatment system 22 is connected with the water inlet of the inclined plate sedimentation tank 41;
a water outlet of a circulating pipeline of the tubular ultrafiltration membrane 43 is connected with a water inlet of a concentration tank of the triple box 42, and chemical precipitated sludge, colloidal particles and suspended matters intercepted by the tubular ultrafiltration membrane 43 are conveyed to the triple box 42 through a return pipeline to form a circulating cross-flow filtration system;
the post-processing unit 44 includes any one or more of: a nanofiltration device, a high-pressure reverse osmosis device and an evaporative crystallization device;
the secondary mine wastewater purification and concentration system 3 comprises a secondary self-cleaning filter 31, a secondary ultrafiltration device 32 and a secondary reverse osmosis device 33 which are sequentially connected, wherein a water inlet of the secondary self-cleaning filter 31 is connected with a water outlet of the ion exchanger 21, and a concentrated water outlet of the secondary reverse osmosis device 33 is connected with a water inlet of the inclined plate sedimentation tank 41, a water inlet of the regenerated waste liquid treatment system 22 and a water inlet of the triple box 42;
the secondary self-cleaning filter 31 is used for removing fine suspended matters in the effluent of the ion exchange softening system 2, the secondary ultrafiltration device 32 is used for filtering the fine suspended matters in the effluent of the ion exchange softening system 2 so as to delay membrane pollution of the secondary reverse osmosis device 33, and the secondary reverse osmosis device 33 is used for concentrating the effluent of the ion exchange softening system 2 and conveying concentrated water to the inclined plate sedimentation tank 41, the regenerated waste liquid treatment system 22 and the triple box 42;
a buffer tank is arranged between the water producing port of the second-stage ultrafiltration device 32 and the water inlet of the second-stage reverse osmosis device 33, the water producing port of the second-stage ultrafiltration device 32 is connected with the water inlet of the second-stage reverse osmosis device 33 through the buffer tank, and the buffer tank is provided with a medicine adding port for adjusting pH.
Example 3
As shown in figure 2, the low-cost recycling cooperative treatment system for negative-hardness wastewater has the following water qualities of mine wastewater to be treated:
Ca2+＝59.2mg/L；Mg2+＝8.3mg/L，SO4 2-＝1270mg/L；HCO3 -＝238mg/L； pH＝8.15，SiO2＝4.5mg/L，TDS＝3208mg/L，SS＝8mg/L，Cl-＝643.5mg/L
the quality of the desulfurization wastewater to be treated is as follows:
Ca2+＝709.5mg/L，Mg2+＝5267.5mg/L，SO4 2-＝16030mg/L， HCO3 -＝93.8mg/L，pH＝6.5，SiO2＝122.7mg/L，TDS＝44205mg/L，SS＝62mg/L， Cl-＝15256mg/L
inflow rate of mine wastewater is 500m3H, throughAfter the mine water adjusting pool is buffered and adjusted, the mine water is lifted to a V-shaped filter pool 11 of a primary mine wastewater purification and concentration system 1 through a water inlet pump, the normal filtration speed of the V-shaped filter pool 11 is designed to be 8m/h, the turbidity of produced water is less than or equal to 2NTU, and backwashing water is collected and returned to the mine water adjusting pool at the front end of the system for circular treatment.
The water produced by the V-shaped filter 11 is pumped to a first-level self-cleaning filter 12 by a water pump, the filtering precision of the first-level self-cleaning filter 12 is less than or equal to 100 mu m, a motor-driven suction type self-cleaning filter is selected, and a filter screen is made of SS316L material.
The produced water of the primary self-cleaning filter 12 is conveyed to a primary ultrafiltration device 13, the recovery rate of the primary ultrafiltration device 13 is 92%, an external pressure type hollow fiber membrane is adopted, the ultrafiltration membrane is made of PVDF (polyvinylidene fluoride), the SDI (standard deviation index) index of the effluent is less than or equal to 3.0, the turbidity is less than or equal to 0.2NTU, and backwashing water is returned to a mine water regulation pool at the front end of the system for circulation treatment after being collected and treated.
The pH value of the produced water of the primary ultrafiltration device 13 is adjusted to 7.5-8.0, the water is lifted to a primary reverse osmosis device 14 through a booster pump and a high-pressure pump, the primary reverse osmosis device 14 adopts a low-pressure anti-pollution roll type brackish water film, the recovery rate is 75 percent, the product water is collected and recycled, and the product water flow is 375m3The TDS of the product water is 41.86 mg/L; concentrated water flow 125m3H, concentrated water SO4 2-5048mg/L, Ca2+234.65Mg/L, Mg2+32.89mg/L, Cl-2545mg/L of HCO3 -920.2mg/L, TDS 13656mg/L, SiO218mg/L, pH 7.5.
The concentrated water of the first-stage reverse osmosis device 14 is delivered to the ion exchanger 21 of the ion exchange softening system 2 by a water pump. The filling resin of the ion exchanger 21 is chelate resin and the type is weak acid type cation exchange resin, the running flow rate is 25m/h, the downstream acid-base regeneration mode and the regeneration period are 24h, and the quality SO of the produced water of the ion exchanger 214 2-5048mg/L, Ca2+Is less than or equal to 1Mg/L, Mg2+Is less than or equal to 1mg/L, Cl-2545mg/L of HCO3 -886mg/L, TDS 13348mg/L, SiO2＝18mg/L。
The produced water of the ion exchanger 21 is pumped to a secondary self-cleaning filter 31 of a secondary mine wastewater purification and concentration system 3 by a water pump, the filtering precision of the secondary self-cleaning filter 31 is less than or equal to 100 mu m, a motor is used for driving a suction type self-cleaning filter, and a filter screen is made of 2205 dual-phase steel materials.
The produced water of the second-stage self-cleaning filter 31 is conveyed to a second-stage ultrafiltration device 32, the recovery rate of the second-stage ultrafiltration device 32 is 92%, an external pressure type hollow fiber membrane is adopted, the ultrafiltration membrane is made of PVDF (polyvinylidene fluoride), the SDI (standard deviation index) index of the produced water is less than or equal to 3.0, the turbidity is less than or equal to 0.2NTU, and backwashing water is returned to a mine water regulating tank at the front end of the system for circulation treatment after being collected and treated.
The produced water of the second-stage ultrafiltration device 32 is lifted to a second-stage reverse osmosis device 8 by a booster pump and a high-pressure pump, the second-stage reverse osmosis device 8 adopts an anti-pollution roll type seawater reverse osmosis membrane, the recovery rate is 75 percent, and the product water flow is 93.75m3Collecting and recycling product water, wherein the TDS of the product water is 256 mg/L; concentrated water flow rate of 31.25m3Per, concentrated water quality SO4 2-19985mg/L, Ca2+4.3Mg/L, Mg2+Is 4.3mg/L, Cl-10000mg/L of HCO3 -3277mg/L and TDS 53845 mg/L.
The regeneration waste liquid treatment system 22 of the ion exchange softening system 2 introduces secondary reverse osmosis concentrated water, and the input amount of the secondary reverse osmosis concentrated water meets the requirement that the ratio of the sum of the mole numbers of calcium ions and magnesium ions to the sum of the mole numbers of bicarbonate radical and sulfate radical in the regeneration waste liquid treatment system 22 of the ion exchange softening system 2 is 1: 1.2, the introduction amount of the second-stage reverse osmosis concentrated water is calculated to be 4.5m3H is used as the reference value. After the chemical sludge such as calcium carbonate, magnesium sulfate, calcium sulfate, etc. is precipitated and filtered in the regeneration waste liquid treatment system 22 of the ion exchange softening system 2, the supernatant is sent to the inclined plate sedimentation tank 41.
The inlet flow of the desulfurization wastewater of the power plant is 20m3And h, after being treated by the original desulfurization wastewater treatment system of the power plant, lifting the wastewater to a desulfurization wastewater buffer tank through a water pump and flowing into an inclined plate sedimentation tank 41 of the cooperative treatment system 4, introducing second-stage reverse osmosis concentrated water into the inclined plate sedimentation tank 41, wherein the input quantity of the second-stage reverse osmosis concentrated water meets the requirement that the ratio of the sum of the molar numbers of sulfate radicals and carbonate radicals in the wastewater to the molar number of calcium ions is 1: 1,the introduction amount of the second-stage reverse osmosis concentrated water is 5.5m by calculation3The dosage of calcium hydroxide is 18.5kg/m3The calcium hydroxide had a purity of 88% and a pH of 11.5. At this time, the water production flow rate is 30m3H, water quality SO of produced water4 2-13680mg/L, Ca2+1616.75Mg/L, Mg2+Not detected, HCO3 -21.6mg/L and TDS 38702 mg/L.
The produced water in the inclined plate sedimentation tank 41 is lifted to a triple box 42 by a water pump, and the triple box 42 introduces the residual second-stage reverse osmosis concentrated water of 21.25m3And h, after the second-stage reverse osmosis concentrated water is uniformly mixed with the produced water of the inclined plate sedimentation tank 41, adding sodium hydroxide until the pH value of the wastewater is 11.5. Because the hydrogen heavy acid radical in the residual secondary reverse osmosis concentrated water is not enough to the residual calcium ion in the produced water of the complete precipitation inclined plate sedimentation tank, additional sodium carbonate is supplemented to 176g/m3And precipitating the remaining calcium ions.
The chemical precipitated sludge in the triple box 42 is conveyed to a tubular ultrafiltration membrane 43 through a high-flow circulating pump for circulating cross-flow filtration, the tubular ultrafiltration membrane is made of PVDF, the pH value of the produced water of the tubular ultrafiltration membrane 43 is adjusted to 7.0 by adding sulfuric acid, and the quality of the produced water SO is4 2-16787mg/L, Ca2+≤20mg/L，Mg2+≤20mg/L，HCO3 -Not detected, TDS was 44230 mg/L.
The produced water of the tubular ultrafiltration membrane 43 is conveyed to a subsequent treatment unit 44 comprising a nanofiltration device, a high-pressure reverse osmosis device, an evaporative crystallization device and the like through a water pump, and finally zero-emission treatment is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (10)
1. The utility model provides a low-cost resourceful cooperative processing system of negative hardness waste water which characterized in that: comprises a primary mine wastewater purification and concentration system (1), an ion exchange softening system (2), a secondary mine wastewater purification and concentration system (3) and a synergistic treatment system (4) which are connected in sequence;
the primary mine wastewater purification and concentration system (1) is used for purifying, concentrating and reducing mine wastewater for the first time, the ion exchange softening system (2) is used for exchanging calcium and magnesium ions in concentrated water of the primary mine wastewater purification and concentration system (1) with ion exchange groups of resin to realize the function of softening wastewater, the secondary mine wastewater purification and concentration system (3) is used for purifying, concentrating and reducing softened primary mine wastewater concentrated solution of the ion exchange softening system (2) for the second time, and the synergistic treatment system (4) is used for mixing concentrated water of the secondary mine wastewater purification and concentration system (3) with desulfurization wastewater to carry out synergistic softening and purification treatment; the ion exchange softening system (2) comprises an ion exchanger (21) connected with a water outlet of the primary mine wastewater purification and concentration system (1) and a regeneration waste liquid treatment system (22) connected with a regeneration waste liquid outlet of the ion exchanger (21), a water inlet of the regeneration waste liquid treatment system (22) is connected with a concentrated water outlet of the secondary mine wastewater purification and concentration system (3), the ion exchanger (21) is used for exchanging calcium and magnesium ions in concentrated water of the primary mine wastewater purification and concentration system (1) with ion exchange groups of resin to realize the effect of softening wastewater, and the regeneration waste liquid treatment system (22) is used for enabling the resin regeneration waste liquid generated by the ion exchanger (21) to react with calcium, magnesium, sulfate and the like in concentrated water of the secondary mine wastewater purification and concentration system (3) under the effects of bicarbonate and sulfate radicals, And removing magnesium ion precipitate.
2. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 1, characterized in that: the cooperative treatment system (4) comprises an inclined plate sedimentation tank (41), a triple box (42) and a tubular ultrafiltration membrane (43) which are sequentially connected, and a water inlet of the inclined plate sedimentation tank (41) and a water inlet of the triple box (42) are both connected with a concentrated water outlet of the secondary mine wastewater purification and concentration system (3);
the inclined plate sedimentation tank (41) is used for precipitating and removing magnesium ions, calcium ions, silicon dioxide and sulfate radicals under the action of sulfate radicals and medicaments in the concentrated water of the secondary mine wastewater purification and concentration system (3) after uniformly mixing the concentrated water with the desulfurization wastewater, and removing colloid particles, suspended matters and partial organic matters, the triple box (42) is used for precipitating residual magnesium ions, calcium ions and silicon dioxide under the action of bicarbonate radicals and medicaments in the concentrated water of the secondary mine wastewater purification and concentration system (3) after uniformly mixing the concentrated water of the secondary mine wastewater purification and concentration system (3), and the tubular ultrafiltration membrane (43) is used for circulating cross-flow filtration of the effluent of the triple box (42).
3. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 1, characterized in that: the primary mine wastewater purification and concentration system (1) comprises a V-shaped filter tank (11), a primary self-cleaning filter (12), a primary ultrafiltration device (13) and a primary reverse osmosis device (14) which are sequentially connected, wherein a concentrated water outlet of the primary reverse osmosis device (14) is connected with a water inlet of the ion exchanger (21);
the V-shaped filter (11) is used for removing colloid particles, suspended matters and partial organic matters in the mine wastewater, the primary self-cleaning filter (12) is used for removing fine suspended matters in the mine wastewater, the primary ultrafiltration device (13) is used for filtering the fine suspended matters in the mine wastewater to delay membrane pollution of the primary reverse osmosis device (14), and the primary reverse osmosis device (14) is used for concentrating the mine wastewater.
4. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 3, characterized in that: a buffer tank is arranged between a water producing port of the primary ultrafiltration device (13) and a water inlet of the primary reverse osmosis device (14), the water producing port of the primary ultrafiltration device (13) is connected with the water inlet of the primary reverse osmosis device (14) through the buffer tank, and the buffer tank is provided with a dosing port for adjusting pH.
5. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 2, characterized in that: second grade mine waste water purifies concentrated system (3) including the second grade self-cleaning filter (31), second grade ultrafiltration device (32) and second grade reverse osmosis unit (33) that connect gradually, the water inlet of second grade self-cleaning filter (31) with the delivery port of ion exchanger (21) links to each other, second grade self-cleaning filter (31) are used for getting rid of the tiny suspended solid of ion exchange softening system (2) play water, second grade ultrafiltration device (32) are used for filtering tiny suspended solid in ion exchange softening system (2) play water is in order to delay second grade reverse osmosis device (33) membrane pollution, second grade reverse osmosis unit (33) are used for the concentration the play water of ion exchange softening system (2).
6. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 5, wherein: a concentrated water outlet of the secondary reverse osmosis device (33) is respectively connected with a water inlet of the regeneration waste liquid treatment system (22), a water inlet of the inclined plate sedimentation tank (41) and a water inlet of the triple box (42);
the secondary reverse osmosis device (33) is used for conveying concentrated water to the inclined plate sedimentation tank (41), the regeneration waste liquid treatment system (22) and the triple box (42).
7. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 5, wherein:
a buffer tank is arranged between the water producing port of the second-stage ultrafiltration device (32) and the water inlet of the second-stage reverse osmosis device (33), the water producing port of the second-stage ultrafiltration device (32) is connected with the water inlet of the second-stage reverse osmosis device (33) through the buffer tank, and the buffer tank is provided with a dosing port for adjusting pH.
8. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 2, characterized in that: the inclined plate sedimentation tank (41) is provided with a calcium hydroxide feeding port, and the triple box (42) is provided with a sodium hydroxide and sodium carbonate feeding port;
and a supernatant outlet of the regeneration waste liquid treatment system (22) is connected with a water inlet of the inclined plate sedimentation tank (41).
9. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 2, characterized in that: and a water outlet of a circulating pipeline of the tubular ultrafiltration membrane (43) is connected with a water inlet of the concentration tank of the triple box (42), and chemical precipitation sludge, colloidal particles and suspended matters intercepted by the tubular ultrafiltration membrane (43) are conveyed to the triple box (42) through a return pipeline to form a circulating cross-flow filtration system.
10. The low-cost recycling cooperative treatment system for negative-hardness wastewater according to claim 2, characterized in that: the co-processing system (4) further comprises a post-processing unit (44) connected to the water production outlet of the tubular ultrafiltration membrane (43), the post-processing unit (44) comprising any one or more of: a nanofiltration device, a high-pressure reverse osmosis device and an evaporative crystallization device.
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