CN110697814B - Ammonia-containing sulfate wastewater treatment system and process - Google Patents
Ammonia-containing sulfate wastewater treatment system and process Download PDFInfo
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Abstract
The invention relates to the field of ammonia nitrogen wastewater treatment, in particular to a system and a process for treating ammonia-containing sulfate wastewater, which comprises a feeding tank and a vapor compressor, wherein the feeding tank is connected with a primary evaporation chamber through a feeding pump by a liquid guide pipe, the primary evaporation chamber is connected with a lime milk tank by a feeding pump, the top of the primary evaporation chamber is connected with a condenser by a gas guide pipe, the bottom of the primary evaporation chamber is connected with a primary heat exchanger by a liquid guide pipe, the bottom of the primary heat exchanger is connected with a secondary evaporation chamber through a liquid guide pipe, the top of the secondary evaporation chamber is connected with the condenser by a gas guide pipe, the bottom of the secondary evaporation chamber is connected with a secondary heat exchanger by a liquid guide pipe, the bottom of the secondary heat exchanger is connected with a belt filter press by a liquid guide pipe, and the belt filter press is connected with a water storage tank A by a liquid guide pipe. The device can recycle ammonia in the ammonia nitrogen wastewater.
Description
Technical Field
The invention relates to the field of ammonia nitrogen wastewater treatment, in particular to a system and a process for treating sulfate wastewater containing ammonia.
Background
At present, two systems are adopted for extracting nonferrous metals by adopting an NH3 saponification organic phase, one system is a chloride system, and the other system is a sulfate system, wherein the chloride system adopts calcium hydroxide to convert ammonia-containing wastewater, the industrialization is realized, ammonia water and calcium chloride solution can be obtained, and the calcium chloride solution is directly discharged. The wastewater of the sulfate system is converted by calcium hydroxide and cannot be industrialized mainly due to the formation of CaSO4·2H2O，CaSO4·2H2O is easily scaled on the wall of the vessel, blocking the pipeline.
Conversion of sulphate System wastewater Using calcium oxide, mainly by (NH4)2SO4+Ca (OH)2→CaSO4+2NH3H2O; a reaction takes place in which NH3·H2And (3) the O is returned for saponification, the ammonia gas is equivalent to a carrier in the whole system, calcium oxide is consumed, the calcium oxide is easily obtained in nature, the cost is low, and the process has a great cost advantage compared with the saponification by adopting sodium hydroxide or ammonia water.
The waste water containing ammonia sulfate system is mainly prepared by adding calcium hydroxide to obtain CaSO4·2H2O、NH3、H2And O, the salt concentration of the generated water is low, the generated water can be directly returned to the production system for use, and the generated ammonia can be directly returned to the saponification organic phase of the production system.
CaSO is obtained by adding calcium hydroxide into the waste water containing the ammonia sulfate system4·2H2The O can be used as a cement additive, the dihydrate gypsum can be further processed into the hemihydrate gypsum, and the hemihydrate gypsum can be used for medical purpose and brings additional value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a process for treating ammonia-containing sulfate wastewater, which can well recycle ammonia in the ammonia-containing sulfate wastewater.
The invention can be realized by the following technical scheme:
the invention discloses an ammonia-containing sulfate wastewater treatment system, which comprises a feeding tank and a vapor compressor, wherein the feeding tank is connected with a primary evaporation chamber through a feeding pump by a liquid guide pipe, the primary evaporation chamber is connected with a lime milk tank through a feeding pump, the top of the primary evaporation chamber is connected with a condenser by a gas guide pipe, the bottom of the primary evaporation chamber is connected with a primary heat exchanger by a liquid guide pipe, the bottom of the primary heat exchanger is connected with a secondary evaporation chamber through a liquid guide pipe, the top of the secondary evaporation chamber is connected with the condenser by a gas guide pipe, the bottom of the secondary evaporation chamber is connected with a secondary heat exchanger by a liquid guide pipe, the bottom of the secondary heat exchanger is connected with a belt filter press by a liquid guide pipe, the belt filter press is connected with a water storage tank A by a liquid guide pipe, the condenser is connected with an ammonia water separation tank, the bottom of the ammonia water separation tank is connected with a water storage tank B by a liquid guide pipe, the upper part of the ammonia water separation tank is connected with an ammonia suction tank through an air duct, the bottom of the water storage tank B is connected with the ammonia suction tank through a liquid guide pipe, the bottom of the ammonia suction tank is connected with an ammonia water storage tank through a liquid guide pipe, one end of the condenser is connected with a condensed water tank through a liquid guide pipe, the other end of the condenser is connected with a condensed water transfer tank through a liquid guide pipe, the bottom of the condensed water transfer tank is connected with the condensed water tank through a liquid guide pipe, the condensed water transfer tank is connected with the outlet of a vapor compressor through an air duct, the vapor compressor is connected with a boiler through an air inlet pipe, and the vapor compressor is respectively connected with a heating cavity in the primary heat exchanger and a heating cavity of the secondary heat exchanger through guide pipes;
a process for treating the sewage containing ammonia sulfate includes such steps as
a. Vacuumizing a device used in the system through a vacuumizing device;
b. ammonia nitrogen wastewater generated in the feeding tank enters a primary evaporation chamber which is pumped into a negative pressure state after passing through a feeding pump;
c. adding lime milk containing 5-50% of calcium hydroxide into the primary evaporation chamber, wherein the adding amount of the lime milk is calculated according to the reaction of the amount of the calcium hydroxide contained in the lime milk and ammonium ions in the ammonia nitrogen wastewater by the theoretical ratio of 1: 1;
d. the first-stage evaporation chamber is heated by hot steam and is in a negative pressure state, the mixed solution of ammonia nitrogen wastewater and lime milk is in a boiling state at the temperature of 30-95 ℃, and the first-stage evaporation chamber is internally provided with a liquid-phase evaporatorCarrying out double decomposition reaction on calcium hydroxide and ammonium sulfate: (NH)4)2SO4+Ca (OH)2→CaSO4+2NH3·H2O；
e. The mixed liquor passes through a primary evaporation chamber and then a primary heat exchanger for primary deamination, then the mixed liquor is pumped into a secondary evaporation chamber by a pump and evaporated into a gas state to enter a secondary heat exchanger, the mixed liquor of the ammonia nitrogen wastewater and the lime milk is in a boiling state at 30-95 ℃, the mixed liquor enters the secondary heat exchanger, and the double decomposition reaction (NH) of calcium hydroxide and ammonium sulfate is continuously generated in the secondary heat exchanger4)2SO4+Ca (OH)2→CaSO4+2NH3·H2O, deep deamination is carried out;
f. pumping the mixed liquor subjected to deep deamination by the secondary heat exchanger into a belt filter press by using a pump for filter pressing to obtain a filter cake which is crude calcium sulfate;
g. mixed gas of ammonia and water vapor generated by the primary evaporation chamber and the secondary evaporation chamber comes out from the tops of the primary evaporation chamber and the secondary evaporation chamber and enters a condenser for heat exchange;
h. the condensed mixed gas of ammonia and water vapor enters an ammonia water separating tank, the ammonia gas enters an ammonia absorption tank from the upper end of the ammonia water separating tank through an air duct, the water vapor enters a water storage tank B after passing through the ammonia water separating tank, the water vapor is pumped to the top of the ammonia absorption tank through a pump at the bottom of the water storage tank B to spray the ammonia gas, and the ammonia water with the corresponding concentration is prepared and enters an ammonia water storage tank;
i. the condensate water in the condensate water tank is pumped to the condenser through a pump at the bottom of the condensate water tank for heat exchange, then the condensate water is transferred to the tank, hot water vapor in the condensate water is transferred to the compressor through an upper end air duct in the condensate water transfer tank, and water returns to the condensate water tank from a lower end liquid guide pipe of the condensate water transfer tank.
Preferably, the device also comprises a vacuum pump which is respectively connected with the condenser, the primary evaporation chamber and the secondary evaporation chamber through air ducts.
Preferably, the condenser is connected to the cooling water through a flow meter and a flow valve. The flow rate of the hot steam and the flow rate of the cold liquid are confirmed and controlled through a flow meter and a flow valve, so that the cold liquid just reaches the required temperature after passing through the condenser.
The working principle of the condenser is as follows: the machine element of refrigerating system belongs to a kind of heat exchanger, which can convert gas or vapour into liquid, and transfer the heat in the tube to the air near the tube in a quick way. The hot ammonia and the water vapor in the tube meet cold objects to exchange heat, the liquid is liquefied into liquid, the working process of the condenser is a heat releasing process, and therefore the temperature of the condenser is high.
The working principle of the first-stage evaporation chamber and the second-stage evaporation chamber is as follows: under the negative pressure state, the boiling point of the liquid is reduced, the liquid is boiled, the liquid water is changed into water vapor, the double decomposition reaction is accelerated under the boiling state, and the ammonia gas is quickly removed.
The working principle of the ammonia water separating tank is as follows: because the boiling points of ammonia and water vapor are different, most of the water vapor and a small amount of ammonia gas are condensed into liquid after the mixed gas of the ammonia gas and the water vapor is condensed into a condenser, the liquid left in the ammonia water separating tank is mostly water and only contains a small amount of ammonia; most of ammonia gas and a small amount of water vapor are still gaseous, and gaseous ammonia and water vapor can enter the ammonia suction tank from the upper end of the ammonia water separation tank through the air duct, so that the purification effect of the ammonia gas is achieved.
The working principle of the first-stage heat exchanger and the second-stage heat exchanger is as follows: devices that transfer part of the heat of a hot fluid to a cold fluid are also known as heat exchangers.
The working principle is as follows: ammonia nitrogen wastewater generated in production is stored in a feed tank, the ammonia nitrogen wastewater contains 5-45% of TDS and a small amount of organic matters at the temperature of 10-60 ℃, the ammonia nitrogen wastewater in the feed tank is pumped into a primary evaporation chamber through a feed pump, simultaneously lime milk originally stored in a lime milk tank is pumped into the primary evaporation chamber through the feed pump to be mixed with the ammonia nitrogen wastewater, mixed feed liquid is boiled in the primary evaporation chamber under the condition of negative pressure and subjected to double decomposition reaction, mixed gas of water vapor and ammonia gas is generated after double decomposition reaction is carried out in the boiling state, the gas is discharged from the upper part of the primary evaporation chamber and enters a condenser, the rest feed liquid sequentially enters a primary heat exchanger to be circularly evaporated, then the feed liquid enters the primary evaporation chamber to continue evaporation reaction, the boiling temperature is 30-95 ℃, mixed gas of water vapor and ammonia gas is generated after double decomposition reaction in a boiling state, the gas comes out from the upper part of a secondary evaporation chamber and enters a condenser, the rest material liquid continues to enter a secondary heat exchanger for continuous evaporation reaction, the material liquid in the secondary heat exchanger enters a belt filter press for filter pressing, residue after filter pressing is rough calcium sulfate, filtrate is water which can be used for production and reuse and is stored in a water storage tank A, the generated mixed gas of ammonia and water vapor enters the condenser for heat exchange through the primary evaporation chamber and the secondary evaporation chamber, the ammonia and the water vapor are separated after heat exchange and enter an ammonia water separating tank for separation, the ammonia gas enters an ammonia absorption tank from the upper end of the ammonia water separating tank, the water enters a water storage tank B after passing through the ammonia water separating tank, and is pumped to the top of the ammonia absorption tank through a pump at the bottom of the water storage tank B for spraying the ammonia gas, and preparing ammonia water with corresponding concentration and feeding the ammonia water into an ammonia water storage tank. The condensate water in the condensate water tank is pumped to the condenser through a pump at the bottom of the condensate water tank for heat exchange, then the condensate water is transferred to the tank, hot water vapor in the condensate water is transferred to the compressor through an upper end air duct in the condensate water transfer tank, and water returns to the condensate water tank from a lower end liquid guide pipe of the condensate water transfer tank. All heat sources of the system are generated by fresh steam from a boiler through a steam compressor, the generated steam enters a first-stage heat exchanger and a second-stage heat exchanger, the steam is condensed into water in the first-stage heat exchanger and the second-stage heat exchanger, the water in the water condensate tank enters a water condensate tank through a liquid guide pipe, the water in the water condensate tank condenses mixed gas of ammonia and water through a condenser, the water enters a condensate water transfer tank, the steam enters the compressor, the water returns to the water condensate tank from a liquid guide pipe at the bottom of the condensate water transfer tank, the water and the steam are recycled, and the heat application is maximized.
Compared with the prior art, the invention has the following advantages:
1. the method can recover ammonia in the wastewater, the deamination rate of the wastewater reaches more than 99%, the recovered ammonia is prepared into ammonia water, and the obtained crude calcium sulfate can also be used for preparing alpha-type hemihydrate gypsum, so that ammonia, wastewater and waste residues can be recycled, the environmental protection problem is well solved, and the economy is increased.
2. The ammonia nitrogen wastewater is treated by the MVR, the inside of the whole MVR is in a negative pressure state, and the deaminated water can be returned to the production for reuse, so that zero discharge of the wastewater is realized, and energy conservation and emission reduction are realized.
3. The calcium hydroxide in the lime milk reacts with the ammonium sulfate in the ammonia nitrogen wastewater to obtain the gypsum with low ammonia nitrogen content, and the process principle is that the calcium hydroxide in the lime milk and the ammonium sulfate generate double decomposition reaction: (NH)4)2SO4+Ca (OH)2→CaSO4+2NH3·H2The ammonia gas generated by O is condensed into ammonia water, the deamination rate of the ammonia nitrogen wastewater can reach 99.7 percent, the deaminated wastewater can be reused as production water, the slag mainly contains calcium sulfate, and the rough calcium sulfate is directly obtained by a filter press.
4. Only ammonia water, crude calcium sulfate and water which can be used for production and reuse are discharged from the whole system, the ammonia water can be recovered, and the recovered ammonia water is used for saponification of an organic phase at an extraction section; the crude calcium sulfate can be used for preparing alpha-hemihydrate gypsum; the water can be used as production water.
5. The whole system does not scale in the operation process, and the production process can recycle ammonia, waste water and waste residues, thereby well solving the environmental protection problem and increasing the economy.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1. a primary evaporation chamber; 2. a secondary evaporation chamber; 3. a compressor; 4. a primary heat exchanger; 5. a secondary heat exchanger; 6. a condenser; 7. transferring the condensed water into a tank; 8. an ammonia absorption tank; 9. an ammonia water separating tank; 10. an ammonia water storage tank; 11. a water storage tank B; 12. a condensate tank; 13. a belt filter press; 14. a water storage tank A; 15. a pump; 16. a feed tank; 17. a lime milk tank;
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:
as shown in figure 1, the invention discloses an ammonia-containing sulfate wastewater treatment system, which comprises a feed tank 16 and a vapor compressor 3, wherein the feed tank 16 is connected with a primary evaporation chamber 1 through a feed pump 15 by a liquid guide pipe, the primary evaporation chamber 1 is connected with a lime milk tank 17 through the feed pump 15, the top of the primary evaporation chamber 1 is connected with a condenser 6 through a gas guide pipe, the bottom of the primary evaporation chamber 1 is connected with a primary heat exchanger 4 through a liquid guide pipe, the bottom of the primary heat exchanger 4 is connected with a secondary evaporation chamber 2 through a liquid guide pipe, the top of the secondary evaporation chamber 2 is connected with a condenser 6 through a gas guide pipe, the bottom of the secondary evaporation chamber 2 is connected with a secondary heat exchanger 5 through a liquid guide pipe, the bottom of the secondary heat exchanger 5 is connected with a belt filter press 13 through a liquid guide pipe, the belt filter press 13 is connected with a water storage tank A14 through a liquid guide pipe, the condenser 6 is connected with an ammonia separation tank 9, the bottom of the ammonia separation tank 9 is connected with a water storage tank B11 through a liquid guide pipe, the upper part of an ammonia water separation tank 9 is connected with an ammonia suction tank 8 through an air duct, the bottom of a water storage tank B11 is connected with the ammonia suction tank 8 through a liquid guide pipe, the bottom of the ammonia suction tank 8 is connected with an ammonia water storage tank 10 through a liquid guide pipe, one end of a condenser 6 is connected with a condensed water tank 12 through a liquid guide pipe, the other end of the condenser 6 is connected with a condensed water rotary tank 7 through a liquid guide pipe, the bottom of the condensed water rotary tank 7 is connected with the condensed water tank 12 through a liquid guide pipe, the condensed water rotary tank 7 is connected with the outlet of a vapor compressor 3 through an air duct, the vapor compressor 3 is connected with a boiler (not shown) through an air inlet pipe, and the vapor compressor 3 is respectively connected with a heating cavity in a primary heat exchanger 4 and a heating cavity of a secondary heat exchanger 5 through guide pipes;
a process for treating the sewage containing ammonia sulfate includes such steps as
a. Vacuumizing the device by a vacuumizing device;
b. ammonia nitrogen wastewater generated in the feeding tank 16 passes through a feeding pump 15 and then enters the primary evaporation chamber 1 which is pumped into a negative pressure state;
c. adding lime milk containing 5-50% of calcium hydroxide into the primary evaporation chamber 1, wherein the adding amount of the lime milk is calculated according to the reaction of the amount of the calcium hydroxide contained in the lime milk and ammonium ions in the ammonia nitrogen wastewater by the theory of 1: 1;
d. the primary evaporation chamber 1 is in a boiling state of 30-95 ℃ under the state of heating by hot steam and negative pressure, and the double decomposition reaction of calcium hydroxide and ammonium sulfate is carried out in the primary evaporation chamber 1: (NH)4)2SO4+Ca (OH)2→CaSO4+2NH3·H2O；
e. The mixed liquid passes through the primary evaporation chamber 1 and then passes through the primary heat exchanger 4 for primary deamination, the mixed liquid is pumped into the secondary evaporation chamber 2 by the pump 15 and then evaporated into a gas state to enter the secondary heat exchanger 5, the mixed liquid of the ammonia nitrogen wastewater and the lime milk is in a boiling state at 30-95 ℃, the mixed liquid enters the secondary heat exchanger 5, and the double decomposition reaction (NH) of calcium hydroxide and ammonium sulfate is continuously generated in the secondary heat exchanger 54)2SO4+Ca (OH)2→CaSO4+2NH3·H2O, deep deamination is carried out;
f. pumping the mixed solution deeply deaminated by the secondary heat exchanger 5 into a belt filter press 13 by a pump 15 for filter pressing to obtain a filter cake which is crude calcium sulfate;
g. mixed gas of ammonia and water vapor generated by the primary evaporation chamber 1 and the secondary evaporation chamber 2 comes out from the tops of the primary evaporation chamber 1 and the secondary evaporation chamber 2 and enters the condenser 6 for heat exchange;
h. the condensed mixed gas of ammonia and water vapor enters an ammonia water separation tank 9, the ammonia gas enters an ammonia absorption tank 8 from the upper end of the ammonia water separation tank 9 through an air duct, the water vapor enters a water storage tank B11 after passing through the ammonia water separation tank 9, the water vapor is pumped to the top of the ammonia absorption tank 8 through a pump 15 at the bottom of a water storage tank B11 to spray the ammonia gas, and the ammonia water with the corresponding concentration is prepared and enters an ammonia water storage tank 10;
i. the condensed water in the condensed water tank 12 is pumped into the condenser 6 through the pump 15 at the bottom of the condensed water tank 12 for heat exchange, and then enters the condensed water in the rotary tank 7, the hot water vapor in the condensed water in the rotary tank 7 enters the compressor 3 through the upper end air duct in the condensed water in the rotary tank, and the water returns to the condensed water tank 12 from the lower end liquid guide pipe of the condensed water in the rotary tank 7.
Wherein, still contain vacuum pump 15, vacuum pump 15 passes through the air duct and connects condenser 6, one-level evaporating chamber 1 and second grade evaporating chamber 2 respectively.
Wherein the condenser 6 is connected with cooling water through a flow meter and a flow valve. The flow rate of the hot steam and the flow rate of the cold liquid are confirmed and controlled by a flow meter and a flow valve, so that the cold liquid just reaches the required temperature after passing through the condenser 6.
The working principle of the condenser 6 is as follows: the machine element of refrigerating system belongs to a kind of heat exchanger, which can convert gas or vapour into liquid, and transfer the heat in the tube to the air near the tube in a quick way. The hot ammonia and the water vapor inside the tubes are subjected to heat exchange when meeting cold objects, the hot ammonia and the water vapor are liquefied into liquid, the working process of the condenser 6 is a heat releasing process, and therefore the temperature of the condenser 6 is higher.
The working principle of the first-stage evaporation chamber 1 and the second-stage evaporation chamber 2 is as follows: under the negative pressure state, the boiling point of the liquid is reduced, the liquid is boiled, the liquid water is changed into water vapor, the double decomposition reaction is accelerated under the boiling state, and the ammonia gas is quickly removed.
The working principle of the primary heat exchanger 4 and the secondary heat exchanger 5 is as follows: devices that transfer part of the heat of a hot fluid to a cold fluid are also known as heat exchangers.
The working principle is as follows: ammonia nitrogen wastewater generated in production is stored in a feeding tank 16, the ammonia nitrogen wastewater contains 5-45% of TDS and a small amount of organic matters at the time, the temperature is 10-60 ℃, the ammonia nitrogen wastewater in the feeding tank 16 is pumped into a primary evaporation chamber 1 through a feeding pump 15, simultaneously lime milk originally stored in a lime milk tank 17 is also pumped into the primary evaporation chamber 1 through the feeding pump 15 to be mixed with the ammonia nitrogen wastewater, mixed feed liquid is boiled in the primary evaporation chamber 1 under the condition of negative pressure, double decomposition reaction occurs, mixed gas of water vapor and ammonia gas is generated after double decomposition reaction occurs in the boiling state, the gas is discharged from the upper part of the primary evaporation chamber 1 and enters a condenser 6, the rest feed liquid sequentially enters a primary heat exchanger 4 to be circularly evaporated, and then the feed liquid enters the primary evaporation chamber 1 to continue evaporation reaction, the boiling temperature is 30-95 ℃, mixed gas of water vapor and ammonia gas can be generated after double decomposition reaction in the boiling state, the gas comes out from the upper part of the secondary evaporation chamber 2 and enters the condenser 6, the rest material liquid continues to enter the secondary heat exchanger 5 for continuous evaporation reaction, the material liquid in the secondary heat exchanger 5 enters the belt filter press 13 for filter pressing, the residue after filter pressing is crude calcium sulfate, the filtrate is water which can be used for production and reuse and is stored in the water storage tank A14, the mixed gas of the generated ammonia and the water vapor enters the condenser 6 for heat exchange by the primary evaporation chamber 1 and the secondary evaporation chamber 2, the ammonia and the water vapor are separated after heat exchange, the ammonia and the water vapor are separated and enter the ammonia water separation tank 9, the ammonia enters the ammonia absorption tank 8 from the upper end of the ammonia water separation tank 9, the water enters the water storage tank B11 after passing through the ammonia water separation tank 9, then the ammonia is pumped to the top of the ammonia absorption tank 8 by a pump 15 at the bottom of the water storage tank B11 to spray the ammonia, and the prepared ammonia water with corresponding concentration enters an ammonia water storage tank 10. The condensed water in the condensed water tank 12 is pumped into the condenser 6 through the pump 15 at the bottom of the condensed water tank 12 for heat exchange, and then enters the condensed water in the rotary tank 7, the hot water vapor in the condensed water in the rotary tank 7 enters the compressor 3 through the upper end air duct in the condensed water in the rotary tank 7, and the water returns to the condensed water tank 12 from the lower end liquid duct of the condensed water in the rotary tank 7. All heat sources of the system are generated by fresh steam from a boiler through a steam compressor 3, the generated steam enters heating cavities of a primary heat exchanger 4 and a secondary heat exchanger 5, the steam is condensed into water in the primary heat exchanger 4 and the secondary heat exchanger 5, the water in the water condensate tank 12 enters a water condensate tank 12 through a liquid guide pipe, the water in the water condensate tank 12 condenses mixed gas of ammonia and water through a condenser 6, the water enters a condensate water transferring tank 7, the steam enters the compressor 3, the water returns to the water condensate tank 12 from the liquid guide pipe at the bottom of the condensate water transferring tank 7, the water and the steam are recycled, and the application of the heat is maximized.
The above description is only a preferred embodiment of the present invention, and it should be noted that a person skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the technical principles of the present invention, and such changes, modifications, substitutions and alterations should also be regarded as the protection scope of the present invention.
Claims (1)
1. An ammonia-containing sulfate wastewater treatment system, comprising a feed tank and a vapor compressor, characterized in that: the feeding tank is connected with a primary evaporation chamber through a feeding pump through a liquid guide pipe, the primary evaporation chamber is connected with a lime milk tank through the feeding pump, the top of the primary evaporation chamber is connected with a condenser through a gas guide pipe, the condenser is connected with cooling water through a flow meter and a flow valve, the bottom of the primary evaporation chamber is connected with a primary heat exchanger through a liquid guide pipe, the bottom of the primary heat exchanger is connected with a secondary evaporation chamber through a liquid guide pipe, the top of the secondary evaporation chamber is connected with the condenser through a gas guide pipe, the bottom of the secondary evaporation chamber is connected with a secondary heat exchanger through a liquid guide pipe, the bottom of the secondary heat exchanger is connected with a belt filter press through a liquid guide pipe, the belt filter press is connected with a water storage tank A through a liquid guide pipe, the condenser is connected with an ammonia water separation tank, the bottom of the ammonia water separation tank is connected with a water storage tank B through a liquid guide pipe, and the upper part of the ammonia water separation tank is connected with an ammonia absorption tank through a gas guide pipe, the system comprises a water storage tank B, a condensate tank, a condensate transfer tank, a condensate compressor, a steam compressor, a first-stage heat exchanger, a second-stage heat exchanger, a sulfate wastewater treatment system, a vacuum pump and a second-stage evaporation chamber, wherein the bottom of the water storage tank B is connected with the ammonia absorption tank through a liquid guide pipe;
the treatment process adopted by the ammonia-containing sulfate wastewater treatment system comprises the following steps:
a. vacuumizing a device used in the system through a vacuumizing device;
b. ammonia nitrogen wastewater generated in the feeding tank enters a primary evaporation chamber which is pumped into a negative pressure state after passing through a feeding pump;
c. adding lime milk containing 5-50% of calcium hydroxide into the primary evaporation chamber, wherein the adding amount of the lime milk is calculated according to the reaction of the amount of the calcium hydroxide contained in the lime milk and ammonium ions in the ammonia nitrogen wastewater by the theoretical ratio of 1: 1;
d. the primary evaporation chamber makes the mixed liquid of ammonia nitrogen wastewater and lime milk in a boiling state at 30-95 ℃ under the conditions of heating by hot steam and negative pressure, and makes calcium hydroxide and ammonium sulfate generate double decomposition reaction in the primary evaporation chamber: (NH)4)2SO4+Ca (OH)2→CaSO4+2NH3·H2O；
e. The mixed liquor passes through a primary evaporation chamber and then a primary heat exchanger for primary deamination, the mixed liquor is pumped into a secondary evaporation chamber by a pump and then evaporated into a gas state to enter a secondary heat exchanger, the mixed liquor of the ammonia nitrogen wastewater and the lime milk is in a boiling state at 30-95 ℃, the mixed liquor enters the secondary heat exchanger, and the double decomposition reaction (NH4) of calcium hydroxide and ammonium sulfate continuously occurs in the secondary heat exchanger2SO4+Ca (OH)2→CaSO4+2NH3·H2O, deep deamination is carried out;
f. pumping the mixed liquor subjected to deep deamination by the secondary heat exchanger into a belt filter press by using a pump for filter pressing to obtain a filter cake which is crude calcium sulfate;
g. mixed gas of ammonia and water vapor generated by the primary evaporation chamber and the secondary evaporation chamber comes out from the tops of the primary evaporation chamber and the secondary evaporation chamber and enters a condenser for heat exchange;
h. the condensed mixed gas of ammonia and water vapor enters an ammonia water separating tank, the ammonia gas enters an ammonia absorption tank from the upper end of the ammonia water separating tank through an air duct, the water vapor enters a water storage tank B after passing through the ammonia water separating tank, the water vapor is pumped to the top of the ammonia absorption tank through a pump at the bottom of the water storage tank B to spray the ammonia gas, and the ammonia water with the corresponding concentration is prepared and enters an ammonia water storage tank;
i. the condensate water in the condensate water tank is pumped to the condenser through a pump at the bottom of the condensate water tank for heat exchange, then the condensate water is transferred to the tank, hot water vapor in the condensate water is transferred to the compressor through an upper end air duct in the condensate water transfer tank, and water returns to the condensate water tank from a lower end liquid guide pipe of the condensate water transfer tank.
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