CN111348756A - Process for removing temporary hardness of water by chemical reaction - Google Patents
Process for removing temporary hardness of water by chemical reaction Download PDFInfo
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- CN111348756A CN111348756A CN202010267671.XA CN202010267671A CN111348756A CN 111348756 A CN111348756 A CN 111348756A CN 202010267671 A CN202010267671 A CN 202010267671A CN 111348756 A CN111348756 A CN 111348756A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention provides a process for removing temporary hardness of water by chemical reaction, belongs to the field of industrial cooling wastewater treatment, and mainly solves the problem of recycling of cooling wastewater. It adopts two-stage dosing to carry out directional chemical precipitation reaction on calcium and magnesium ions in water, then carries out high-efficiency inclined tube precipitation and outputs softened water. Compared with membrane technology filtration treatment, the invention reduces energy consumption, investment and operation cost, recycles waste water and realizes zero discharge. The invention is used for treating industrial cooling wastewater in the fields of electric power, petroleum, chemical industry, coal, metallurgy, building materials, pharmacy and the like.
Description
Technical Field
The invention relates to the fields of electric power, petroleum, chemical industry, metallurgy, coking, building materials and pharmaceutical protection, in particular to a cooling wastewater recycling process.
Background
Water cooling is a very common process in the industries of electricity, petroleum, chemical industry, metallurgy, coking, building materials, pharmacy and the like. Heat exchange is usually performed by a packed cooling tower and a circulating water tank. In the water cooling process, the concentration of calcium and magnesium ions tends to rise continuously due to water evaporation and atomized water loss, and when cooling water reaches a cooling heat exchanger, calcium carbonate and magnesium carbonate crystals are formed due to thermal decomposition of bicarbonate and stay on the wall of the heat exchange pipe, namely, scaling. Controlling the calcium carbonate hardness of cooling water is an important issue for cooling water. The method for controlling the hardness of calcium carbonate generally comprises the steps of adding a scale inhibitor into a circulating water tank, discharging waste water from the inner part of the circulating water tank when the hardness of calcium carbonate in the circulating water tank reaches 300-350 mg/l, and supplementing new raw water.
The cooling water accounts for 80% of the industrial water, and the discharge amount of cooling waste water is not inconsiderable. Only once generating electricity by waste heat in building material industry, the high-salinity wastewater is discharged from hundreds of parts to thousands of parts, and once a day is discharged for 500m with less frequency3And most of the wastewater treatment systems have over thousands of aspects, so that the amount of high-salinity wastewater discharged by the power industry is more huge and is often impact load. Along with the deepening of environmental protection and ecological concepts, the discharge of cooling wastewater to the factory gradually comes into the sewage treatment supervision range, and the cyclic utilization becomes a great trend increasingly.
Disclosure of Invention
The invention aims to systematically solve the problem of recycling industrial cooling wastewater with temporary hardness reduction.
In order to achieve the aim, the invention provides a process for removing temporary hardness of water by chemical reaction, which is used for treating cooling wastewater in the electric power industry, the petroleum industry, the chemical industry, the metallurgy industry, the coking industry and the pharmaceutical industry and is characterized in that,
in the first process, cooling wastewater is brought into a buffer pool A with a certain volume, and a lift pump is used for homogenizing the pulse load into a continuous flow.
Adding a certain amount of OH-containing solution-Agent for Mg in wastewater2+Carrying out a chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament. Further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing.
Adding a certain amount of CO-containing wastewater3 2-Agent for Ga in wastewater2+Carrying out chemical precipitation reaction to generate CaCO3Suspending particles; preference is given to environmentally friendly Na2CO3A medicament. Further preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
Step four, adding coagulant into the waste water to formMg (OH)2、CaCO3Flocculating the suspended matters; this segment of the process allows for omission. Preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
And fifthly, performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting and concentrating suspended particles.
And sixthly, discharging the supernatant subjected to precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling.
And in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve.
And (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
In order to achieve the above object, the present invention provides another process for removing temporary hardness of water by chemical reaction, which is used for cooling wastewater treatment in industries such as electric power, petroleum, chemical engineering, metallurgy, coking, pharmacy, etc., and is characterized in that,
in the first process, cooling wastewater is brought into a buffer pool A with a certain volume, and a lift pump is used for homogenizing the pulse load into a continuous flow.
Adding a certain amount of OH-containing solution-Agent for Mg in wastewater2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament. Further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing.
Adding a certain amount of PO into the wastewater4 3-Agent for Ga in wastewater2Ion(s)+Carrying out chemical precipitation reaction to generate Ca3(PO4)2Suspending particles; preference is given to environmentally friendly Na3PO4、H3PO4A medicament. Further preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
Step four, adding coagulant into the wastewater to form Mg (OH)2、Ca3(PO4)2Flocculating the suspended matters; this segment of the process allows for omission. Preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
And fifthly, performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting and concentrating suspended particles.
And sixthly, discharging the supernatant subjected to precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling.
And in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve.
And (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
The invention provides a process for removing temporary hardness of water by chemical reaction, which is used for softening industrial water and is characterized in that,
in the first process, raw water is lifted by a pump from a water intake, and Mg in the raw water2+If the ion content is significant, a certain amount of OH-containing solution is added-Agent for Mg in raw water2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament. Further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing.
In the second step, a certain amount of CO-containing water is added to the raw water3 2-Agent for Ga in raw water2+Ions are subjected to chemical precipitation reaction to generate CaCO3Suspending particles; preference is given to environmentally friendly Na2CO3A medicament. Further preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
Step three, adding coagulant to the raw water to form Mg (OH)2、CaCO3The suspended matter, and the background suspended particles in the raw water are flocculated. Preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
And fourthly, performing efficient inclined-tube precipitation on the turbid liquid, performing precipitation separation and converging concentrated suspended particles.
And fifthly, discharging the supernatant after precipitation separation, and allowing the supernatant to enter a deep filtration system or directly enter a clear water buffer pool B and then be connected into a cooling water system for recycling.
And in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve.
And (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
The invention provides another process for removing temporary hardness of water by chemical reaction, which is used for softening industrial water supply and is characterized in that,
weighing one, lifting raw water from a water intake by a pump, if Mg in the raw water2+If the ion content is significant, a certain amount of OH-containing solution is added-Agent for Mg in raw water2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament. Further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing.
In the second step, a certain amount of PO is added to the raw water4 3-Agent for Ga in wastewater2+Ion is subjected to chemical precipitation reaction to generate Ca3(PO4)2Suspending particles; preference is given to environmentally friendly Na3PO4、H3PO4A medicament. Further preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
Step three, adding coagulant to the raw water to form Mg (OH)2、Ca3(PO4)2The suspended matter, and the background suspended particles in the raw water are flocculated. Preferably, a hose is adopted in the stirring tank to randomly and multi-point disperse the medicine adding device for adding the medicine.
And fourthly, performing efficient inclined-tube precipitation on the turbid liquid, performing precipitation separation and converging concentrated suspended particles.
And fifthly, discharging the supernatant after precipitation separation, and allowing the supernatant to enter a deep filtration system or directly enter a clear water buffer pool B and then be connected into a cooling water system for recycling.
And in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve.
And (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
Drawings
FIG. 1 is a schematic diagram of a process flow of carbonate chemical reaction treatment recycling of industrial cooling wastewater according to the invention.
FIG. 2 is a schematic diagram of a process flow for phosphate chemical reaction treatment and recycling of industrial cooling wastewater according to the invention.
FIG. 3 is a schematic flow diagram of a process for reducing temporary hardness of feedwater by carbonate chemical reaction treatment according to the present invention.
FIG. 4 is a schematic flow diagram of a process for reducing temporary hardness of feedwater by phosphate chemical reaction treatment according to the present invention.
Description of the reference numerals
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and are not to be construed as limiting the present invention.
The first embodiment is as follows:
an industrial cooling wastewater recycling process according to an embodiment of the present invention is described below with reference to the accompanying drawings. As in fig. 1.
Adding caustic soda and sodium carbonate into the wastewater to perform two-stage chemical reaction precipitation, and then performing high-efficiency precipitation separation.
The technical principle of the invention is as follows:
firstly, bringing the pulse load discharged by the cooling wastewater into a buffer pool A, and then uniformly conveying the pulse load by using a lifting pump.
Temporary hardness of cooling waste water from Mg2+、Ca2+Form, Mg (OH)2Has an equilibrium solubility lower than that of CaCO3The solubility of (a). So that the alkaline medicament NaOH to Mg is preferentially added2+A precipitation chemical reaction is carried out, and simultaneously, the pH of the wastewater is increased to be more alkaline, and Mg (OH) is generated2And (4) suspension.
Adding carbonate reagent Na2CO3For Ca2+Carrying out a precipitation chemical reaction to generate CaCO3And (4) suspension. In a slightly alkaline environment, CO3 2-Capture of calcium ions to produce CaCO3The capacity of the strain is obviously enhanced and can reach 100 percent.
Nascent Mg (OH)2、CaCO3The fine particles are flocculated and polymerized and then are precipitated in a next-stage efficient sedimentation tank. Calcium carbonate density 2.7g/cm3Is easy to precipitate by itself. The flocculation process can be weakened or even eliminated.
And outputting softened water to the clean water tank B. And intermittently discharging the precipitated and concentrated slurry into a buffer tank C, and further performing solid-liquid separation.
Example two:
another industrial cooling wastewater recycling process according to an embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in fig. 2.
In contrast to the first example, the second reactant was phosphate trisodium phosphate Na3PO4。
For Mg, it is to be noted that2+、Ca2+The order of precipitation by the addition of the chemical reaction can be reversed, with the only difference being a reduction in the removal efficiency.
The density of the calcium phosphate reaches 3.4g/cm3Specific calcium carbonate density of 2.7g/cm3It is easier to precipitate. The flocculation process can be weakened or even eliminated.
Example three:
a process for reducing the temporary hardness of feedwater by carbonate chemical reaction treatment according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in fig. 3.
The first place of difference between the embodiment is that water is taken from a surface water taking point, pumping is carried out, and a buffer pool A is omitted.
Example four:
a process for reducing the temporary hardness of feedwater by carbonate chemical reaction treatment according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in fig. 3.
The difference between the embodiment and the second embodiment is that water is taken from a surface water taking point, pumping is carried out, and a buffer pool A is omitted.
Advantageous effects
Compared with the prior art, the industrial cooling wastewater recycling process has the following beneficial effects:
1) compared with the membrane filtration technology, the energy consumption is low.
2) The method is focused on forming calcium and magnesium ions with temporary hardness to carry out chemical reaction treatment, and has low investment and operation cost.
3) Realizes the recycling of industrial cooling wastewater, and has remarkable environmental benefit, economic benefit and social benefit.
Claims (4)
1. A process for removing temporary hardness of water by chemical reaction for treating the cooling waste water in electric power, petroleum, chemical, metallurgical, coking, building material and pharmaceutical industries,
the method comprises the following steps that firstly, cooling wastewater is brought into a buffer pool A with a certain volume, and a lift pump is used for homogenizing pulse load into continuous flow;
in the second process, a certain amount of OH-containing medicament is added for treating Mg in the wastewater2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament; preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing;
adding a certain amount of CO-containing wastewater3 2+Agent for Ga in wastewater2+Ions are subjected to chemical precipitation reaction to generate CaCO3Suspending particles; preference is given to environmentally friendly Na2CO3A medicament; further preferably, a hose is adopted in the stirring tank to randomly feed the medicines by a multipoint dispersion medicine feeder;
step four, adding coagulant into the wastewater to form Mg (OH)2、CaCO3Suspended in waterFlocculating the substance; this segment of the process allows omission; preferably, a hose is adopted in the stirring tank to feed medicines by a multipoint random dispersing medicine feeder;
performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting concentrated suspended particles;
discharging supernatant liquid after precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling;
in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve;
and (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
2. A process for removing temporary hardness of water by chemical reaction for treating the cooling waste water in electric power, petroleum, chemical, metallurgical, coking, building material and pharmaceutical industries,
the method comprises the following steps that firstly, cooling wastewater is brought into a buffer pool A with a certain volume, and a lift pump is used for homogenizing pulse load into continuous flow;
in the second process, a certain amount of OH-containing medicament is added for treating Mg in the wastewater2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament; further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing;
adding a certain amount of PO into the wastewater4 3-Agent for Ga in wastewater2+Ion is subjected to chemical precipitation reaction to generate Ca3(PO4)2Suspending particles; preference is given to environmentally friendly Na3PO4、H3PO4A medicament; further preferably, a hose is adopted in the stirring tank to randomly feed the medicines by a multipoint dispersion medicine feeder;
step four, adding coagulant into the wastewater to form Mg (OH)2、Ca3(PO4)2Flocculation of suspended matter(ii) a This segment of the process allows omission; preferably, a hose is adopted in the stirring tank to feed medicines by a multipoint random dispersing medicine feeder;
performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting concentrated suspended particles;
discharging supernatant liquid after precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling;
in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve;
and (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
3. A process for removing temporary hardness of water by chemical reaction for softening industrial water features that the water is softened by chemical reaction,
in the first process, raw water is lifted by a pump from a water intake, and Mg in the raw water2+If the ion content is significant, a certain amount of OH-containing solution is added-Agent for Mg in raw water2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament; further preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing;
in the second step, a certain amount of CO-containing water is added to the raw water3 2-Agent for Ga in raw water2+Ions are subjected to chemical precipitation reaction to generate CaCO3Suspending particles; preference is given to environmentally friendly Na2CO3A medicament; further preferably, a hose is adopted in the stirring tank to randomly feed the medicines by a multipoint dispersion medicine feeder;
step three, adding coagulant to the raw water to form Mg (OH)2、CaCO3Flocculating suspended matters and background suspended particles in the raw water; preferably, a hose is adopted in the stirring tank to feed medicines by a multipoint random dispersing medicine feeder;
performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting concentrated suspended particles;
discharging supernatant liquid after precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling;
in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve;
and (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
4. A process for removing temporary hardness of water by chemical reaction for softening industrial water features that the water is softened by chemical reaction,
in the first process, raw water is lifted by a pump from a water intake, and Mg in the raw water2+If the ion content is significant, a certain amount of OH-containing solution is added-Agent for Mg in raw water2+Ion chemical precipitation reaction to form Mg (OH)2Suspending particles; preferred are NaOH and NH which are environment-friendly4OH (or ammonia), Ba (OH)2A medicament; preferably, a pipeline mixer and a hose random multi-point dispersion doser are adopted for dosing;
in the second step, a certain amount of PO is added to the raw water4 3-Agent for Ga in wastewater2+Ion is subjected to chemical precipitation reaction to generate Ca3(PO4)2Suspending particles; preference is given to environmentally friendly Na3PO4、H3PO4A medicament; further preferably, a hose is adopted in the stirring tank to randomly feed the medicines by a multipoint dispersion medicine feeder;
step three, adding coagulant to the raw water to form Mg (OH)2、Ca3(PO4)2Flocculating suspended matters and background suspended particles in the raw water; preferably, a hose is adopted in the stirring tank to feed medicines by a multipoint random dispersing medicine feeder;
performing high-efficiency inclined-tube precipitation on the turbid liquid, performing precipitation separation, and collecting concentrated suspended particles;
discharging supernatant liquid after precipitation separation, entering a deep filtration system or directly entering a clear water buffer pool B, and accessing a cooling water system for recycling;
in the branching process 1, the slurry of the collected suspended particles is intermittently discharged to a slurry buffer pool C under the control of a valve; and (2) a branch process, namely pumping the slurry from the slurry buffer tank C into a solid-liquid separation system to separate out a mud cake.
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Application publication date: 20200630 |
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