CN111892224B - Ammonia-nitrogen wastewater treatment system and method based on south crossing dialysis and osmotic distillation coupling - Google Patents
Ammonia-nitrogen wastewater treatment system and method based on south crossing dialysis and osmotic distillation coupling Download PDFInfo
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Abstract
The invention discloses an ammonia nitrogen wastewater treatment system and method based on south-of-the-road dialysis and osmotic distillation coupling. The system comprises a feed liquid tank, a south China dialysis component, a receiving liquid tank, a pervaporation component and a permeate liquid tank. The treatment method comprises the steps of filling ammonia nitrogen wastewater into a feed liquid tank, filling driving liquid into a receiving liquid tank, and filling acid solution into a penetrating liquid tank; starting a driving pump and adjusting the flow; calculating the migration amount of ammonia nitrogen in a certain time; when the whole system reaches the balance, the reaction is stopped, and the device is cleaned. The invention can simultaneously realize the removal and recovery of ammonia nitrogen in the wastewater, and the coupling process has better treatment efficiency than the independent process, thereby having important guiding significance for the practical application of recovering ammonia nitrogen from sewage. The driving force in the system is concentration driving, no additional energy is needed, and the system is a low-energy-consumption and low-cost ammonia nitrogen treatment and recovery system and is worthy of popularization and application.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a system and a method for treating ammonia nitrogen wastewater by a dialysis and osmotic distillation coupling process.
Background
Nitrogen is one of the most important elements in the biosphere, the value of ammonia nitrogen is very high, and the method greatly contributes to modern agriculture and industry. At present, natural nitrogen fixation cannot meet the requirements of human beings. On the one hand, people utilize the Haber-Bosch process to synthesize ammonia, obtain nitrogen resources according to the situation of ammonia nitrogen, consume huge energy and discharge a large amount of greenhouse gases. On the other hand, the unreasonable use of ammonia nitrogen also causes the damage to water, soil and ecological environment. The ammonia nitrogen is regarded as a pollutant in the current water treatment process and needs to be removed to ensure that the water quality reaches the standard. The resource value of ammonia nitrogen is ignored, and the concept is not in accordance with the sustainable development.
The existing technology (biological methods such as series technologies based on activated sludge, physical and chemical methods such as steam stripping, air stripping, ion exchange, adsorption, electrodialysis, electrochemical methods and the like) or loses the available value of ammonia nitrogen, or has high cost and energy consumption and no economic attraction, thereby restricting the proper removal and recovery of ammonia nitrogen in water. The proper water treatment technology needs to input with low energy consumption, consider the reduction of ammonia nitrogen and realize the recovery of ammonia nitrogen.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problem that ammonia nitrogen is wasted because the ammonia nitrogen cannot be recovered after the ammonia nitrogen in water is removed in the prior art, and provides a system and a method for treating and recovering ammonia nitrogen wastewater, which can enrich the ammonia nitrogen in the wastewater and then recycle the ammonia nitrogen, so that the purpose of waste utilization is achieved, and the cost for recovering the ammonia nitrogen is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
an ammonia nitrogen wastewater treatment system based on south crossing dialysis and osmotic distillation coupling comprises a feed liquid tank, a south crossing dialysis component, a receiving liquid tank, an osmotic distillation component and an osmotic liquid tank; wherein the content of the first and second substances,
the south crossing dialysis component comprises a feed liquid cavity and a receiving liquid cavity, wherein the feed liquid cavity and the receiving liquid cavity are separated by a cation exchange membrane, the feed liquid cavity and the receiving liquid cavity are respectively provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet direction of the feed liquid cavity is opposite to the liquid inlet direction of the receiving liquid cavity; the osmotic distillation assembly comprises a receiving liquid cavity and a permeating liquid cavity, wherein the receiving liquid cavity and the permeating liquid cavity are separated by a hydrophobic membrane, the receiving liquid cavity and the permeating liquid cavity are provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet direction of the receiving liquid cavity is opposite to the liquid inlet direction of the permeating liquid cavity;
the liquid inlet pipe and the liquid outlet pipe of the liquid feeding cavity of the south road dialysis component are respectively communicated with the liquid feeding tank through pipelines, the liquid inlet pipe and the liquid outlet pipe of the liquid receiving cavity of the south road dialysis component are respectively communicated with the liquid receiving tank through pipelines, and the liquid inlet pipe of the liquid feeding cavity and the liquid inlet pipe of the liquid receiving cavity are respectively provided with a driving pump; the liquid inlet pipe and the liquid outlet pipe of the liquid receiving cavity of the osmotic distillation assembly are respectively communicated with the liquid receiving tank through pipelines, the liquid inlet pipe and the liquid outlet pipe of the osmotic liquid cavity of the osmotic distillation assembly are respectively communicated with the osmotic liquid tank through pipelines, and the liquid inlet pipe of the liquid receiving cavity and the liquid inlet pipe of the osmotic liquid cavity are respectively provided with a driving pump.
Through setting up the feed liquor jar, say south dialysis subassembly, receive the fluid reservoir, pervaporation subassembly and infiltration fluid reservoir, will say south dialysis subassembly and pervaporation subassembly coupling and be arranged in ammonia nitrogen wastewater treatment system because the feed liquor direction that receives the sap cavity is opposite with the feed liquor direction in permeate liquid chamber in saying south dialysis, the feed liquor direction that receives the sap cavity is also opposite with the feed liquor direction in permeate liquid chamber in the pervaporation, and be provided with the actuating pump respectively in the feed liquor direction, therefore, in the course of the work, the velocity of flow of liquid can be controlled to the actuating pump, and liquid is cross-flow formula (flow opposite direction) structure, the concentration polarization layer of the thin film face, reduce the resistance, can effectively improve the treatment effect. The Taoism dialysis is used for enriching ammonia nitrogen from ammonia nitrogen sewage so as to reduce the material consumption of subsequent treatment; the osmotic distillation is used for recovering ammonia nitrogen, and meanwhile, the osmotic distillation can improve the enrichment rate of the ammonia nitrogen by the south of the way dialysis. The ammonia nitrogen wastewater treatment system based on the south of the road dialysis and the osmotic distillation coupling can simultaneously realize the removal and the recovery of ammonia nitrogen in wastewater, and the coupling process has better treatment efficiency than an independent process, and has important guiding significance for the practical application of recovering ammonia nitrogen from sewage. In addition, the driving force in the system is concentration driving, no additional energy is needed, and the system is an ammonia nitrogen treatment and recovery system with low energy consumption and low cost and is worthy of popularization and application.
Furthermore, the south road dialysis component and the osmotic distillation component both comprise an upper membrane plate and a lower membrane plate, the upper membrane plate and the lower membrane plate are connected through bolts, and grooves are respectively formed in corresponding positions of the lower side of the upper membrane plate and the upper side of the lower membrane plate; the liquid inlet pipe and the liquid outlet pipe are respectively arranged on two sides of the upper membrane plate and two sides of the lower membrane plate and are communicated with the grooves in the upper membrane plate and the lower membrane plate. Like this, in the south of the way dialysis subassembly, form the feed liquor chamber between the recess of upper diaphragm plate and the cation exchange membrane, form between the recess of lower diaphragm plate and the cation exchange membrane and receive the sap cavity, the ammonium ion in the feed liquor chamber of being convenient for enters into and receives the sap cavity through cation exchange membrane, and with receiving liquid reaction and generating the ammonia, the formation of ammonia can reduce the accumulation of receiving the ammonium ion concentration in the fluid reservoir simultaneously, and then impel the south of the way dialysis process to continue to take place, thereby make the treatment effect can effectively improve. In the osmotic distillation subassembly, form between the recess of upper diaphragm plate and the hydrophobic membrane and receive the sap cavity, form between the recess of lower diaphragm plate and the hydrophobic membrane and permeate the sap cavity, the ammonia in the sap cavity of being convenient for receive enters into the permeate the sap cavity through hydrophobic membrane, makes it react with the solution in the permeate the sap cavity and forms the ammonium salt that can be directly utilized.
Furthermore, an O-shaped ring is arranged between the upper diaphragm plate and the lower diaphragm plate and is positioned outside the grooves on the upper diaphragm plate and the lower diaphragm plate; on last lamina membranacea, be equipped with a seal groove corresponding this O type circle, the upside of O type circle inlays to be located in this seal groove, like this, can be sealed with the clearance between last lamina membranacea and the lower lamina membranacea through this O type circle, avoids feed liquid, receiving liquid and penetrant to reveal.
Furthermore, the upper membrane plate and the lower membrane plate are made of polyethylene materials, so that the system is durable and the reliability of the system is improved.
Furthermore, the two sides of the cation exchange membrane and the two sides of the hydrophobic membrane are respectively provided with a separation net, the periphery of the separation net is fixed with the periphery of the upper membrane plate or the periphery of the lower membrane plate respectively, and the grooves are shielded, so that liquid can uniformly pass through the separation net, the influence of a boundary layer is reduced, and the filtering effect is better.
The invention also provides an ammonia nitrogen wastewater treatment method based on the combination of southern dialysis and osmotic distillation, and a system for treating ammonia nitrogen wastewater by adopting the dialysis and osmotic distillation combination process, which comprises the following steps:
s1, filling ammonia nitrogen wastewater into a feed liquid tank, filling driving liquid into a receiving liquid tank, and filling acid solution into a penetrating liquid tank;
s2, starting a driving pump and adjusting the flow; adjusting the flow between the feed liquid tank and the south tunnel dialysis component, between the receiving liquid tank and the osmotic distillation component, and between the osmotic distillation component and the osmotic liquid tank, so that the ammonia nitrogen wastewater sequentially passes through the south tunnel dialysis component, the receiving liquid tank and the osmotic distillation component from the feed liquid tank and finally reaches the osmotic liquid tank;
s3, respectively measuring the pH values in the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, then respectively sampling from the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, measuring the concentration of ammonia nitrogen in the sample, and calculating the migration amount of the ammonia nitrogen in a certain time;
and S4, stopping the reaction and cleaning the device when the balance of the whole system is determined according to the migration quantity of ammonia nitrogen.
By adopting the ammonia nitrogen wastewater treatment method based on the south of the Yangtze river dialysis and the osmotic distillation coupling, ammonia nitrogen is enriched from ammonia nitrogen wastewater through the south of the Yangtze river dialysis so as to reduce the material consumption of subsequent treatment; the osmotic distillation is used for recovering ammonia nitrogen, and meanwhile, the osmotic distillation can improve the enrichment rate of the ammonia nitrogen by the south of the way dialysis. The conventional treatment equipment is adopted, the steps are simple and easy to operate, the ammonia nitrogen in the water is removed, the ammonia nitrogen is recycled, and the treatment cost is low.
Further, the molar concentration ratio of the cations in the driving liquid to the ammonia nitrogen in the wastewater to be treated is 1-100. Preferably 1. Therefore, the process can promote the south dialysis reaction and does not cause the waste of raw materials. The driving liquid adopts alkali liquor, can react with ammonium ions entering the receiving liquid to generate ammonia, and is directly absorbed by a penetrating fluid through the hydrophobic membrane. The preferable driving liquid adopts the waste alkali liquor generated in a factory, so as to achieve the purposes of recovering ammonia nitrogen and reducing the pH value of the waste alkali liquor.
Further, in the acid solution, H + The mol ratio of the ammonia nitrogen to the ammonia nitrogen in the wastewater to be treated is 1-2. Thus, the process of the osmotic distillation reaction can be promoted, and the waste of raw materials is avoided. The excessive driving liquid can completely react with ammonium ions entering the receiving liquid through south-of-the-road dialysis, so that ammonia nitrogen in the wastewater is thoroughly removed, and the removing effect is obvious.
The working principle of the invention is as follows:
1. in the south of the road dialysis, the greater the difference in concentration between the driver ion (sodium ion) and the target ion (ammonium ion), the higher the treatment efficiency. Under ideal conditions, the recovery rate of sodium chloride solution as the driving liquid is shown in formula (1). The higher the concentration of cations in the driving liquid, the better, i.e., the larger the molar ratio of cations to ammonium ions. When sodium ion (monovalent cation)/ammonium ion =20: the recovery rate of ammonium ions can reach 95% in 1 hour. When the driving liquid is alkali with the same concentration as the salt, the reaction of the alkali and the ammonium ions can break the southeast balance and promote the reaction to continue, so the effect of the alkali with the same concentration is better than that of the salt.
2. In the osmotic distillation, the influence factor of the treatment effect of the osmotic distillation is the partial pressure difference of ammonia gas, and is mainly influenced by pH under the isothermal condition. The partial pressure difference of ammonia is the difference between the partial pressure of ammonia on the driving liquid side and the partial pressure of ammonia on the permeate side, as shown in formula (2). The partial pressure value is related to the concentration of ammonia gas. When the partial pressure of ammonia gas on the receiving liquid side is larger and the partial pressure of ammonia gas on the permeate side is smaller (approaches 0), the larger the partial pressure difference is, the easier the reaction proceeds. Therefore, when the concentration of hydroxide in the driving liquid is higher and the concentration of hydrogen ions in the penetrating liquid is higher, the partial pressure difference of ammonia gas on two sides of the hydrophobic membrane is higher, the ammonia gas migrates through the membrane, and the ammonia gas is more easily converted into ammonium ions and forms ammonium salts.
N＝αΔP＝α(P i，f -P i，p ) (2)
Wherein α is the permeability (kg/m) of the membrane 2 s Pa)，P i，f And P i，p The vapor pressure (Pa) of the membrane surface on the driving liquid side and the permeate side, and N is the flux (kg/m) of ammonia gas 2 s)
Compared with the prior art, the invention has the following advantages:
1. the ammonia nitrogen wastewater treatment system based on the south of the road dialysis and the osmotic distillation coupling can simultaneously realize the removal and the recovery of ammonia nitrogen in wastewater, and the coupling process has better treatment efficiency than an independent process, and has important guiding significance for the practical application of recovering ammonia nitrogen from sewage. The southwest dialysis is used for enriching ammonia nitrogen from ammonia nitrogen sewage so as to reduce the material consumption of subsequent treatment, and the osmotic distillation is used for recovering the ammonia nitrogen and improving the enrichment rate of the southwest dialysis on the ammonia nitrogen. The driving force in the treatment system provided by the invention is concentration driving, no external energy is needed, and the system is an ammonia nitrogen treatment and recovery system with low energy consumption and low cost and is worthy of popularization and application.
2. Through setting up the feed liquor jar, say south dialysis subassembly, receive the fluid reservoir, pervaporation subassembly and infiltration fluid reservoir, will say that south dialysis subassembly and pervaporation subassembly coupling are arranged in the ammonia nitrogen wastewater treatment system because the feed liquor direction that receives the sap cavity is opposite with the feed liquor direction in permeate liquid chamber in saying south dialysis, the feed liquor direction that receives the sap cavity is also opposite with the feed liquor direction in permeate liquid chamber in the pervaporation, and be provided with the actuating pump respectively in the feed liquor direction, therefore, in the course of the work, the velocity of flow of liquid can be controlled to the actuating pump, and liquid is cross-flow formula (flow opposite direction) structure, the concentration polarization layer of the thin film face, reduce the resistance, can effectively improve processing speed and treatment effect.
3. According to the treatment method provided by the invention, ammonium ions are enriched from the complex components, then the complex components are migrated in the form of ammonia gas, and finally the complex components are recovered in the form of ammonium ions, so that the purposes of extracting and preparing high-purity nitrogen from sewage mixed with multiple components are achieved, and the added value of products is high. And no complex operation and management is needed, and the method is suitable for the operation of an unmanned management mode in a remote area.
Drawings
FIG. 1 is a schematic diagram of an ammonia nitrogen wastewater treatment system based on south-of-the-road dialysis and osmotic distillation coupling.
FIG. 2 is a schematic diagram (exploded view) showing the construction of a south dialysis module or a pervaporation module according to the present invention.
In the figure: the device comprises a feed liquid tank 1, a south-of-the-road dialysis component 2, a cation exchange membrane 21, a receiving liquid tank 3, a pervaporation component 4, a hydrophobic membrane 41, a permeate liquid tank 5, a driving pump 6, an upper membrane plate 71, a lower membrane plate 72, a groove 73, an O-shaped ring 74 and a separation net 75.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Referring to fig. 1, the ammonia nitrogen wastewater treatment system based on the south crossing dialysis and the osmotic distillation coupling comprises a feed liquid tank 1, a south crossing dialysis component 2, a receiving liquid tank 3, an osmotic distillation component 4 and a permeate liquid tank 5. Wherein, way south dialysis subassembly 2 includes feed liquor chamber and receipt sap cavity, feed liquor chamber separates through cation exchange membrane 21 with receiving the sap cavity, and this feed liquor chamber all has feed liquor pipe and drain pipe with receiving the sap cavity, and the feed liquor direction in feed liquor chamber is opposite with the feed liquor direction who receives the sap cavity. Osmotic distillation subassembly 4 is including receiving sap cavity and penetrant cavity, it separates through hydrophobic membrane 41 to receive sap cavity and penetrant cavity, should receive the sap cavity and have feed liquor pipe and drain pipe with the penetrant cavity, and the feed liquor direction of receiving the sap cavity is opposite with the feed liquor direction in penetrant cavity.
In specific implementation, referring to fig. 2, the south of the road dialysis module 2 and the osmotic distillation module 4 both comprise an upper membrane plate 71 and a lower membrane plate 72, and the upper membrane plate 71 and the lower membrane plate 72 are connected through bolts. Grooves 73 are respectively formed in the corresponding positions of the lower side of the upper membrane plate 71 and the upper side of the lower membrane plate 72, and the liquid inlet pipe and the liquid outlet pipe are respectively arranged on the two sides of the upper membrane plate 71 and the two sides of the lower membrane plate 72 and are communicated with the grooves 73 on the upper membrane plate 71 and the lower membrane plate 72. During the implementation, go up lamina membranacea 71 and lower lamina membranacea 72 and adopt the polyethylene material to make, preferably adopt ya keli organic glass, can run through the condition of reaction process and membrane better, durable increases the reliability of system. Thus, in the south crossing dialysis module 2, a feed liquid cavity is formed between the groove 73 of the upper membrane plate 71 and the cation exchange membrane 21, and a receiving liquid cavity is formed between the groove 73 of the lower membrane plate 72 and the cation exchange membrane 21, so that ammonia nitrogen ions in the feed liquid cavity can enter the receiving liquid cavity through the cation exchange membrane 21 and further enter the receiving liquid tank 3 to react to generate ammonia gas. In the osmotic distillation module 4, a receiving liquid cavity is formed between the groove 73 of the upper membrane plate 71 and the hydrophobic membrane 41, and a permeate liquid cavity is formed between the groove 73 of the lower membrane plate 72 and the hydrophobic membrane 41, so that ammonia gas in the receiving liquid cavity can enter the permeate liquid cavity through the hydrophobic membrane 41, and reacts with the solution in the permeate liquid cavity to form ammonium salt which can be directly utilized. The partition nets 75 are disposed on both sides of the cation exchange membrane 21 and both sides of the water-repellent membrane 41, respectively. The periphery of the separation net 75 is fixed with the periphery of the upper membrane plate 71 or the periphery of the lower membrane plate 72 respectively, and the groove 73 is shielded, so that liquid can uniformly pass through the separation net 75, the influence of a boundary layer is reduced, and the filtering effect is better. An O-ring 74 is also arranged between the upper diaphragm plate 71 and the lower diaphragm plate 72, and the O-ring 74 is positioned outside the groove 73 on the upper diaphragm plate 71 and the lower diaphragm plate 72; a sealing groove is formed in the upper membrane plate 71 corresponding to the O-shaped ring 74, the upper side of the O-shaped ring 74 is embedded in the sealing groove, and therefore the gap between the upper membrane plate 71 and the lower membrane plate 72 can be sealed through the O-shaped ring 74, and leakage of feed liquid, receiving liquid and penetrating liquid is avoided. The liquid inlet pipe and the liquid outlet pipe of the liquid cavity of the south road dialysis component 2 are respectively communicated with the liquid tank 1 through pipelines, the liquid inlet pipe and the liquid outlet pipe of the liquid receiving cavity are respectively communicated with the liquid receiving tank 3 through pipelines, and the liquid inlet pipe of the liquid receiving cavity are respectively provided with a driving pump 6. In particular, the driving pump 6 is preferably a peristaltic pump, which is an ideal tool for delivering highly aggressive fluids, and the fluid only contacts the pump tube of the peristaltic pump and does not contact the pump body, so that no additional contamination is caused. The liquid inlet pipe and the liquid outlet pipe of the receiving liquid cavity of the osmotic distillation component 4 are respectively communicated with the receiving liquid tank 3 through pipelines, the liquid inlet pipe and the liquid outlet pipe of the osmotic liquid cavity of the osmotic distillation component are respectively communicated with the osmotic liquid tank 5 through pipelines, and the liquid inlet pipe of the receiving liquid cavity and the liquid inlet pipe of the osmotic liquid cavity are respectively provided with a driving pump 6. Therefore, in the working process, the driving pump 6 can control the flow velocity of the liquid, the liquid is in a cross-flow type (opposite flow direction) structure, the concentration polarization layer on the film surface is thinned, the resistance is reduced, and the treatment effect can be effectively improved. In specific implementation, the south of the road dialysis module 2 and the osmotic distillation module 4 can also adopt other membrane modules, such as a roll-type membrane module, the cation exchange membrane 21 or the hydrophobic membrane 41 is rolled into a cylinder shape, and two kinds of liquid for exchange are respectively positioned at the inner side and the outer side of the cylinder; or a tubular membrane component is adopted, the cation exchange membrane 21 or the hydrophobic membrane 41 is made into a tubular shape, and the two liquids are respectively positioned outside and inside the tube. In specific implementation, the south road dialysis module 2 and the osmotic distillation module 4 can also adopt a roll-type membrane module, a tubular membrane module or other membrane module forms capable of achieving the purpose of the invention. The Taonan dialysis is used for enriching ammonia nitrogen from ammonia nitrogen sewage so as to reduce the material consumption of subsequent treatment; the osmotic distillation is used for recovering ammonia nitrogen, and meanwhile, the osmotic distillation can improve the enrichment rate of the ammonia nitrogen by the south of the way dialysis.
The ammonia nitrogen wastewater treatment system based on the south of the road dialysis and the osmotic distillation coupling can simultaneously realize the removal and the recovery of ammonia nitrogen in wastewater, and the coupling process has better treatment efficiency than an independent process, and has important guiding significance for the practical application of recovering ammonia nitrogen from sewage. The driving force in the system is concentration driving, no additional energy is needed, and the system is an ammonia nitrogen treatment and recovery system with low energy consumption and low cost and is worthy of popularization and application.
The invention also provides an ammonia nitrogen wastewater treatment method based on the south of the road dialysis and the osmotic distillation coupling, and a system for treating ammonia nitrogen wastewater by adopting the dialysis and the osmotic distillation coupling process specifically comprises the following steps:
s1, filling ammonia nitrogen wastewater into a feed liquid tank 1, filling driving liquid into a receiving liquid tank 3, and filling acid solution into a permeable liquid tank 5;
s2, starting a driving pump 6 and adjusting the flow; adjusting the flow between the feed liquid tank 1 and the south crossing dialysis component 2, between the receiving liquid tank 3 and the osmotic distillation component 4, and between the osmotic distillation component 4 and the osmotic liquid tank 5, so that the ammonia nitrogen wastewater sequentially passes through the south crossing dialysis component 2, the receiving liquid tank 3 and the osmotic distillation component 4 from the feed liquid tank 1 and finally reaches the osmotic liquid tank 5;
s3, respectively measuring the pH values in the feed liquid tank 1, the receiving liquid tank 3 and the permeate liquid tank 5, then respectively sampling from the feed liquid tank 1, the receiving liquid tank 3 and the permeate liquid tank 5, measuring the concentration of ammonia nitrogen in the samples, and calculating the migration volume of the ammonia nitrogen in a certain time;
and S4, stopping the reaction and cleaning the device when the balance of the whole system is determined according to the migration amount of the ammonia nitrogen.
The driving liquid is an alkali solution, common solutions such as sodium hydroxide and potassium hydroxide can be adopted, and the driving liquid is easy to obtain and low in use cost. The molar concentration ratio of the cations in the driving liquid to the ammonia nitrogen in the wastewater to be treated is 1-100. Preferably 1. Therefore, the process can promote the south dialysis reaction and does not cause the waste of raw materials. The driving liquid adopts alkali liquor, can react with ammonium ions entering the receiving liquid to generate ammonia, and is directly absorbed by a penetrating fluid through the hydrophobic membrane. The preferable driving liquid adopts the waste alkali liquor generated in a factory, so as to achieve the purposes of recovering ammonia nitrogen and reducing the pH value of the waste alkali liquor.
In the acid solution, H + The mol ratio of the ammonia nitrogen to the ammonia nitrogen in the wastewater to be treated is 1-2. Thus, the process of the osmotic distillation reaction can be promoted, and the waste of raw materials is avoided. The excessive driving liquid can completely react with ammonium ions entering the receiving liquid through south-of-the-road dialysis, so that ammonia nitrogen in the wastewater is thoroughly removed, and the removing effect is obvious.
Example 1
S1, filling 5mM NH of ammonia nitrogen wastewater into a feed liquid tank 4 Cl, 100mM NaOH as a driving liquid was charged into the receiving liquid tank, and 50mM H as an acid solution was charged into the permeate tank 2 SO 4 。
And S2, starting a driving pump, and adjusting the flow rates of 432mL/min between the feed liquid tank and the south crossing dialysis component, between the receiving liquid tank and the osmotic distillation component, and between the osmotic distillation component and the osmotic liquid tank, so that the ammonia nitrogen wastewater sequentially passes through the south crossing dialysis component, the receiving liquid tank and the osmotic distillation component from the feed liquid tank and finally reaches the osmotic liquid tank.
S3, respectively measuring the pH values in the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, then respectively sampling from the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, measuring the concentration of ammonia nitrogen in the sample, and calculating the migration quantity of the ammonia nitrogen in a certain time;
s4, after reacting for 7 hours, stopping the reaction, cleaning the device, and measuring NH in the ammonia nitrogen wastewater 4 The concentration of Cl is 0.14mM, and the removal rate of ammonia nitrogen is 97.2%.
Example 2
S1, filling 50mM NH of ammonia nitrogen wastewater into a feed liquid tank 4 Cl, 100mM NaOH as a driving liquid was charged into the receiving liquid tank, and 50mM H as an acid solution was charged into the permeate tank 2 SO 4 。
And S2, starting a driving pump, and adjusting the flow rates of 432mL/min between the feed liquid tank and the south crossing dialysis component, between the receiving liquid tank and the osmotic distillation component, and between the osmotic distillation component and the osmotic liquid tank, so that the ammonia nitrogen wastewater sequentially passes through the south crossing dialysis component, the receiving liquid tank and the osmotic distillation component from the feed liquid tank and finally reaches the osmotic liquid tank.
S3, respectively measuring the pH values in the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, then respectively sampling from the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, measuring the concentration of ammonia nitrogen in the sample, and calculating the migration quantity of the ammonia nitrogen in a certain time;
s4, after reacting for 9 hours, stopping the reaction, cleaning the device, and measuring NH in the ammonia nitrogen wastewater 4 The concentration of Cl is 7.2mM, and the removal rate of ammonia nitrogen is 85.6%.
Therefore, by adopting the ammonia nitrogen wastewater treatment system and method based on the south crossing dialysis and the osmotic distillation coupling, ammonia nitrogen is enriched from ammonia nitrogen sewage through the south crossing dialysis, the ammonia nitrogen is recovered through the osmotic distillation, the ammonia nitrogen in the ammonia nitrogen wastewater can be effectively removed, and the removal rate can reach 97.2%. The collected ammonia nitrogen is converted into ammonium salt to be recycled, the demand on ammonia nitrogen is met, the production cost of ammonia nitrogen is reduced, and the method has important guiding significance on the practical application of recycling ammonia nitrogen from sewage.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (4)
1. A method for treating ammonia nitrogen wastewater based on south-crossing dialysis and osmotic distillation coupling is characterized in that a system for treating ammonia nitrogen wastewater based on south-crossing dialysis and osmotic distillation coupling technology is adopted, and the system comprises a feed liquid tank, a south-crossing dialysis component, a receiving liquid tank, an osmotic distillation component and a permeate liquid tank; wherein, the first and the second end of the pipe are connected with each other,
the south road dialysis component comprises a feed liquid cavity and a receiving liquid cavity, the feed liquid cavity and the receiving liquid cavity are separated by a cation exchange membrane, the feed liquid cavity and the receiving liquid cavity are respectively provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet direction of the feed liquid cavity is opposite to the liquid inlet direction of the receiving liquid cavity; the osmotic distillation assembly comprises a receiving liquid cavity and a permeating liquid cavity, wherein the receiving liquid cavity and the permeating liquid cavity are separated by a hydrophobic membrane, the receiving liquid cavity and the permeating liquid cavity are provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet direction of the receiving liquid cavity is opposite to the liquid inlet direction of the permeating liquid cavity;
the liquid inlet pipe and the liquid outlet pipe of the liquid feeding cavity of the south road dialysis component are respectively communicated with the liquid feeding tank through pipelines, the liquid inlet pipe and the liquid outlet pipe of the liquid receiving cavity of the south road dialysis component are respectively communicated with the liquid receiving tank through pipelines, and the liquid inlet pipe of the liquid feeding cavity and the liquid inlet pipe of the liquid receiving cavity are respectively provided with a driving pump; the liquid inlet pipe and the liquid outlet pipe of the liquid receiving cavity of the osmotic distillation assembly are respectively communicated with the liquid receiving tank through pipelines, the liquid inlet pipe and the liquid outlet pipe of the osmotic liquid cavity of the osmotic distillation assembly are respectively communicated with the osmotic liquid tank through pipelines, and the liquid inlet pipe of the liquid receiving cavity and the liquid inlet pipe of the osmotic liquid cavity are respectively provided with a driving pump;
the method specifically comprises the following steps:
s1, filling ammonia nitrogen wastewater into a feed liquid tank, filling driving liquid into a receiving liquid tank, and filling acid solution into a penetrating liquid tank; the driving liquid is an alkali solution; the molar concentration ratio of the cations in the driving liquid to the ammonia nitrogen in the wastewater to be treated is 1 to 100; in the acid solution, H + The mol ratio of the ammonia nitrogen to the ammonia nitrogen in the wastewater to be treated is 1 to 2;
s2, starting a driving pump, and adjusting the flow between a feed liquid tank and the south crossing dialysis component, between a receiving liquid tank and the osmotic distillation component, and between the osmotic distillation component and a permeate liquid tank, so that the ammonia nitrogen wastewater sequentially passes through the south crossing dialysis component, the receiving liquid tank and the osmotic distillation component from the feed liquid tank and finally reaches the permeate liquid tank;
s3, respectively measuring the pH values in the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, then respectively sampling from the feed liquid tank, the receiving liquid tank and the penetrating liquid tank, measuring the concentration of ammonia nitrogen in the sample, and calculating the migration amount of the ammonia nitrogen in a certain time;
and S4, stopping the reaction and cleaning the device when the balance of the whole system is determined according to the migration amount of the ammonia nitrogen.
2. The ammonia nitrogen wastewater treatment method based on south-of-the-road dialysis and osmotic distillation coupling according to claim 1, wherein the south-of-the-road dialysis component and the osmotic distillation component both comprise an upper membrane plate and a lower membrane plate, the upper membrane plate and the lower membrane plate are connected through bolts, and a groove is respectively formed in the corresponding positions of the lower side of the upper membrane plate and the upper side of the lower membrane plate; the liquid inlet pipe and the liquid outlet pipe are respectively arranged on two sides of the upper membrane plate and two sides of the lower membrane plate and are communicated with the grooves on the upper membrane plate and the lower membrane plate; the upper membrane plate and the lower membrane plate are made of polyethylene materials.
3. The ammonia nitrogen wastewater treatment method based on the south crossing dialysis and the osmotic distillation coupling as claimed in claim 1, wherein an O-ring is further arranged between the upper membrane plate and the lower membrane plate, and the O-ring is positioned outside the grooves on the upper membrane plate and the lower membrane plate; on the upper diaphragm plate, a sealing groove is arranged corresponding to the O-shaped ring, and the upper side of the O-shaped ring is embedded in the sealing groove.
4. The ammonia nitrogen wastewater treatment method based on south of the road dialysis and the osmotic distillation coupling as claimed in claim 1, wherein separation nets are further respectively arranged on both sides of the cation exchange membrane and both sides of the hydrophobic membrane, and the peripheries of the separation nets are fixed with the peripheries of the upper membrane plate or the lower membrane plate respectively and shield the grooves.
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