CN204417218U - A kind of softening installation processing high rigidity, low alkalinity brine waste - Google Patents
A kind of softening installation processing high rigidity, low alkalinity brine waste Download PDFInfo
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- CN204417218U CN204417218U CN201420824037.1U CN201420824037U CN204417218U CN 204417218 U CN204417218 U CN 204417218U CN 201420824037 U CN201420824037 U CN 201420824037U CN 204417218 U CN204417218 U CN 204417218U
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Abstract
A kind of softening installation processing high rigidity, low alkalinity brine waste, belong to the water treatment field in environment protection, the pond susceptor body of this device be provided with settling bowl and produce pond, inverted stirrer is provided with in settling bowl, settling bowl top is provided with effluent weir, the upper and lower of settling bowl is followed successively by hybrid reaction district and negative area, and the top of negative area is provided with micropore aeration pipe, and micropore aeration pipe is communicated by inlet pipe; The middle part of negative area is provided with water distributor, and water distributor communicates with water inlet pipe, and water inlet pipe is provided with line mixer, and line mixer is provided with chemical feed pipe; This device by adding carbonic acid gas and caustic soda in waste water, dosing, gas distribution, stirring and reaction is carried out in softening installation, make it to react with the calcium ions and magnesium ions in water, to realize the removal to the water hardness, improve utilising efficiency, avoid dust pollution, reduce energy consumption, save reagent cost, hardness removal efficiency is very high, and reaction thoroughly.
Description
Technical field
The invention belongs to the water treatment field in environment protection, relate to a kind of softening installation processing high rigidity, low alkalinity brine waste,
Background technology
Current, the removal of hardness in industrial brine waste, substantially common several treatment processs are: lime softening method, lime-soda ash tenderizer, lime-gypsum facture and Dual alkali.
Usually the hydromining lime softening method that, basicity high to hardness is high; Hydromining lime-soda ash tenderizer that, basicity high to hardness is low or Dual alkali; The negative hard water that, basicity low to hardness is high then adopts lime-gypsum facture.
Lime softening method: for avoiding adding the contamination by dust that unslaked lime (CaO) produces, usually first unslaked lime is made slaked lime (Ca (OH) 2, i.e. white lime) and use, its reaction is as follows.
CaO+H2O＝Ca(OH)2
Slaked lime drops in high hardness, can produce following reaction.
Ca(OH)2+CO2＝CaCO3↓+H2O
Ca(OH)2+Ca(HCO3)2＝2CaCO3↓+2H2O
Ca(OH)2+Mg(HCO3)2＝2CaCO3↓+Mg(OH)2↓+2H2O
Formed CaCO3 and Mg (OH) 2 be all insoluble compound, can from water Precipitation.
Lime-soda ash tenderizer: lime softening method is only applicable to hard high, forever firmly low water conditioning temporarily.The low namely forever firmly high water of, basicity high to hardness, can adopt lime-soda ash tenderizer (or Dual alkali), adds appropriate soda ash (Na2CO3, also known as soda) while namely adding lime again.Its reaction is as follows.
CaSO4+Na2CO3＝CaCO3↓+Na2SO4
CaCl2+Na2CO3＝CaCO3↓+2NaCl
MgSO4+Na2CO3＝MgCO3↓+Na2SO4
MgCl2+Na2CO3＝MgCO3↓+2NaCl
MgCO3+Ca(OH)2＝CaCO3↓+Mg(OH)2↓
Water after lime-soda ash softens, its hardness can reduce to 0.15 ~ 0.2mmol/L.In addition, forever firmly also can direct ion exchange method remove.
Lime-gypsum facture: for the negative hard water of high alkalinity, namely in water, total alkalinity is greater than the water of total hardness, and now unnecessary in water total alkalinity often exists with the form of NaHCO3 or KHCO3, often removes with lime-gypsum facture these unnecessary basicity.Its reaction is as follows.
2NaHCO3+CaSO4+Ca(OH)2＝2CaCO3↓+Na2SO4+2H2O
2KHCO3+CaSO4+Ca(OH)2＝2CaCO3↓+K2SO4+2H2O
The method of several removal hardness above, all have that reagent consumption amount is large, dosage control difficulty large, easily the shortcomings such as dust pollution are produced to surrounding environment.
Summary of the invention
For the problem existing for the current method removing hardness in industrial brine waste, the invention provides a kind of softening installation processing high rigidity, low alkalinity brine waste, this device by adding a certain amount of carbonic acid gas and caustic soda (NaOH) in the brine waste of high rigidity, low alkalinity, dosing, gas distribution, stirring and reaction is carried out in the softening installation of special facture, make it to react with the calcium ions and magnesium ions in water, to realize the removal to the water hardness.Concrete reaction is as follows.
2NaOH+CO2＝Na2CO3+H2O
CaSO4+Na2CO3＝CaCO3↓+Na2SO4
CaCl2+Na2CO3＝CaCO3↓+2NaCl
MgSO4+Na2CO3＝MgCO3↓+Na2SO4
MgCl2+Na2CO3＝MgCO3↓+2NaCl
MgCO3+2NaOH＝Na2CO3↓+Mg(OH)2↓
In order to realize object of the present invention, following for employing technical scheme is implemented by we:
A kind of softening installation processing high rigidity, low alkalinity brine waste, comprise: pond susceptor body, settling bowl, product pond, water producing pipe, shore pipe and sludge pump, pond susceptor body be arranged side by side settling bowl and produced pond, communicated by water producing pipe between settling bowl with product pond, shore pipe is communicated with the bottom of settling bowl by sludge pump, it is characterized in that: also comprise water inlet pipe, chemical feed pipe, inlet pipe, water distributor, line mixer, micropore aeration pipe, stirrer and effluent weir, wherein:
The top center point position of described settling bowl is provided with the drive unit of stirrer, and the blade of stirrer is by being arranged in settling bowl with drive unit connection for transmission axle;
The below at described settling bowl top is provided with effluent weir;
Between the bottom of settling bowl, be divided into hybrid reaction district and negative area successively below the effluent weir of settling bowl, the top of negative area is provided with micropore aeration pipe, and micropore aeration pipe is communicated by inlet pipe and settling bowl outside;
The middle part of negative area is provided with water distributor, and water distributor is communicated with settling bowl outside by water inlet pipe, the water inlet pipe of settling bowl outside is provided with line mixer, line mixer is provided with chemical feed pipe.
Further, one end of described water producing pipe communicates with settling bowl effluent weir, and the other end is arranged at and produces in water tank.
Further, described micropore aeration pipe has two at least.
Further, the top of described product pool wall of pool is provided with rising pipe.
Further, many described micropore aeration pipes are positioned at same plane, and are series relationship.
Further, be connected bottom described water distributor with water inlet pipe, top is plane, and plane is evenly equipped with posticum.
Further, posticum has five at least.
Beneficial effect
By controlling the parameter such as dosage, reaction times, gas flow rate, temperature, stir speed (S.S.) of carbonic acid gas and sodium hydroxide, utilize gas distribution equipment and medicine machine in softening installation, pass into carbon dioxide and sodium hydroxide simultaneously, when intaking total hardness (in CaCO3)≤2000mg/L, go out total hardness of water (in CaCO3) and can be controlled in below 150mg/L, calcium ion clearance >=90%, magnesium ion clearance >=95%, total hardness clearance >=92%.
In the present invention, aeration tube is laid bottom softening installation, by aeration tube, carbon dioxide is distributed in softening installation equably, make carbonic acid gas and sodium hydroxide obtain fully mixing and reaction by stirring lentamente, and the calcium ions and magnesium ions finally and in waste water react to reach the object removing hardness fully simultaneously.This gas distribution has following several advantage with the softening installation and softening method stirring coupling: the utilising efficiency that 1, improve carbonic acid gas, fully can react with sodium hydroxide and calcium ions and magnesium ions; 2, the dust pollution adding medicament and produce is avoided to a great extent; 3, by the gas distribution effect of aeration tube, serve stirring action to a certain degree, decrease the energy consumption of stirrer; 4, carbonic acid gas cost is very low, saves reagent cost; 5, hardness removal efficiency is very high, and reaction thoroughly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A structural representation of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further:
As depicted in figs. 1 and 2, the softening installation structure of process high rigidity of the present invention, low alkalinity brine waste is as follows:
A kind of softening installation processing high rigidity, low alkalinity brine waste, comprise: pond susceptor body 2, settling bowl 10, product pond 8, water producing pipe 9, shore pipe 13 and sludge pump 14, pond susceptor body 2 be arranged side by side settling bowl 10 and produced pond 8, communicated by water producing pipe 9 between settling bowl 10 with product pond 8, shore pipe 13 is communicated by the bottom of sludge pump 14 with settling bowl 10, wherein, also comprise water inlet pipe 5, chemical feed pipe 7, inlet pipe 1, water distributor 11, line mixer 6, micropore aeration pipe 3, stirrer 15 and effluent weir 4
The top center point position of described settling bowl 10 is provided with the drive unit of stirrer 15, and the blade of stirrer 15 is by being arranged in settling bowl 10 with drive unit connection for transmission axle;
The below at described settling bowl 10 top is provided with effluent weir 4;
Between the bottom of settling bowl 10, be divided into hybrid reaction district and negative area successively below the effluent weir 4 of settling bowl 10, the top of negative area is provided with micropore aeration pipe 3, and micropore aeration pipe 3 is communicated by inlet pipe 1 and settling bowl 10 outside;
The middle part of negative area is provided with water distributor 11, and water distributor 11 is communicated with settling bowl 10 outside by water inlet pipe 5, the water inlet pipe 5 of settling bowl 10 outside is provided with line mixer 6, line mixer 6 is provided with chemical feed pipe 7.
Be introduced for industrial park brine waste processing item, the mean concns of each pollutent of industry brine waste is: total hardness (in CaCO3) is 1200mg/L, total alkalinity (in CaCO3) is 200mg/L, TDS is 2500mg/L, COD is 80mg/L, and ammonia nitrogen is 5mg/L.Flooding velocity is 10m3/h.
Sodium hydroxide is joined by volume pump and chemical feed pipe 7 in the line mixer 6 on water inlet pipe 5, by water distributor 11 enters in settling bowl 10 negative area together with after mixing with water inlet, intakes to realize water distribution uniformity bottom settling bowl 10; The micropore aeration pipe 3 that carbonic acid gas is transported in settling bowl 10 in the middle part of negative area by inlet pipe 1 is evenly distributed in water, in settling bowl 10 negative area, namely calcium ions and magnesium ions in carbonic acid gas and sodium hydroxide and water starts to react, along with the rising of water level, reaction is carried out gradually completely and is generated the precipitation such as calcium carbonate, magnesium hydroxide; Under the stirring action of the stirrer 15 in settling bowl 10, reaction is carried out more thorough, and meanwhile, along with stirring lentamente, the deposit seeds that reaction generates forms rapidly block flco, is removed under the effect in follow-up tube settler and filter tank.
When sodium hydroxide dosage be 140 ~ 180g/min, flow of carbon dioxide gas amount is 40 ~ 50L/min, the reaction times is 2 ~ 4h, stir speed (S.S.) is 100 ~ 200r/min, water temperature is 15 ~ 25 DEG C, the total hardness of softening installation water outlet can remain on below 100mg/L, and delivery turbidity can remain on below 1NTU.As can be seen here, the hardness removal effect of this softening installation is very good, and evenly the flocculating effect of gas distribution and mechanical stirring coupling generation is also very good simultaneously.
The gordian technique of this softening installation is: the utilization of inlet channel mixing tank 6 ensures that sodium hydroxide is uniformly dissolved, the softening reaction of bottom of device water distribution uniformity guarantee is more rapidly with thorough, the even gas distribution of bottom of device aeration tube 3 improves the utilization ratio of carbonic acid gas, water inlet and air inlet are all flow lifting type and ensure enough reaction times and sedimentation effect, the even gas distribution of softening installation and mechanical stirring coupling ensure good flocculating settling effect, carbonic acid gas and sodium hydroxide coupling ensure that good in hard effect, carbonic acid gas and sodium hydroxide coupling high degree reduce the dust pollution of surrounding, carbonic acid gas and sodium hydroxide coupling greatly reduce medicament expense and use.
Claims (7)
1. one kind processes the softening installation of high rigidity, low alkalinity brine waste, comprise: pond susceptor body, settling bowl, product pond, water producing pipe, shore pipe and sludge pump, pond susceptor body be arranged side by side settling bowl and produced pond, communicated by water producing pipe between settling bowl with product pond, shore pipe is communicated with the bottom of settling bowl by sludge pump, it is characterized in that: also comprise water inlet pipe, chemical feed pipe, inlet pipe, water distributor, line mixer, micropore aeration pipe, stirrer and effluent weir, wherein:
The top center point position of described settling bowl is provided with the drive unit of stirrer, and the blade of stirrer is by being arranged in settling bowl with drive unit connection for transmission axle;
The below at described settling bowl top is provided with effluent weir;
Between the bottom of settling bowl, be divided into hybrid reaction district and negative area successively below the effluent weir of settling bowl, the top of negative area is provided with micropore aeration pipe, and micropore aeration pipe is communicated by inlet pipe and settling bowl outside;
The middle part of negative area is provided with water distributor, and water distributor is communicated with settling bowl outside by water inlet pipe, the water inlet pipe of settling bowl outside is provided with line mixer, line mixer is provided with chemical feed pipe.
2. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 1, is characterized in that: one end of described water producing pipe communicates with settling bowl effluent weir, and the other end is arranged at and produces in water tank.
3. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 1, is characterized in that: described micropore aeration pipe has two at least.
4. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 1, is characterized in that: the top of described product pool wall of pool is provided with rising pipe.
5. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 3, is characterized in that: many described micropore aeration pipes are positioned at same plane, and are series relationship.
6. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 1, it is characterized in that: be connected with water inlet pipe bottom described water distributor, top is plane, and plane is evenly equipped with posticum.
7. a kind of softening installation processing high rigidity, low alkalinity brine waste according to claim 6, is characterized in that: posticum has five at least.
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| CN201420824037.1U CN204417218U (en) | 2014-12-22 | 2014-12-22 | A kind of softening installation processing high rigidity, low alkalinity brine waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496041A (en) * | 2014-12-22 | 2015-04-08 | 内蒙古久科康瑞环保科技有限公司 | Softening device for treating high-hardness, low-alkalinity salt-containing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496041A (en) * | 2014-12-22 | 2015-04-08 | 内蒙古久科康瑞环保科技有限公司 | Softening device for treating high-hardness, low-alkalinity salt-containing wastewater |
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