CN115367943A - Energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system and process - Google Patents

Energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system and process Download PDF

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CN115367943A
CN115367943A CN202211009944.6A CN202211009944A CN115367943A CN 115367943 A CN115367943 A CN 115367943A CN 202211009944 A CN202211009944 A CN 202211009944A CN 115367943 A CN115367943 A CN 115367943A
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CN115367943B (en
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吴嘉
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • 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
    • C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
    • 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
    • C02F1/043—Details
    • 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
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • 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
    • C02F2101/20—Heavy metals or heavy metal compounds
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery

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Abstract

The invention relates to an energy-saving system and a process for treating salt-containing heavy ammonia nitrogen-containing wastewater, belonging to the field of wastewater treatment. The system comprises a wastewater treatment subsystem and a heat pump subsystem, wherein the wastewater treatment subsystem treats wastewater through deamination, de-weighting and desalination processes, the energy of the deamination, de-weighting and desalination processes is integrated and used by the heat pump subsystem, the process energy integration level is obviously improved, and the system energy consumption is greatly reduced. The method aims at the problems of low heat integration degree and high energy consumption of the existing treatment process of the wastewater containing salt and heavy ammonia nitrogen, faces to the important requirements of energy saving and carbon reduction in the industrial process of China, effectively realizes energy conservation in the treatment process of the wastewater containing salt and heavy ammonia nitrogen, and has important significance for assisting the realization of the national double-carbon target.

Description

Energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system and process
Technical Field
The invention belongs to the technical field of waste water treatment energy conservation, and particularly relates to an energy-saving system and process for treating salt-containing heavy ammonia nitrogen-containing waste water.
Background
In chemical industry, metallurgy, electroplating, material preparation and the likeIn the production process, industrial wastewater containing heavy metal ions, inorganic salt and ammonia nitrogen is often generated. Such as: the preparation process of the ternary positive electrode material of the lithium ion battery mainly adopts a complex precipitation method to synthesize a precursor material, ammonia water is added into a mixed aqueous solution of nickel sulfate, cobalt sulfate and manganese sulfate, then NaOH solution is added to adjust the pH value of the aqueous solution, so that nickel, cobalt and manganese metal ions form hydroxide precipitate, and then the ternary precursor is obtained through filtration, dehydration and heating and aging. The waste water produced in this process contains a large amount of ammonium ions (NH) 4 + ) And free ammonia (NH) 3 ) Unprecipitated nickel, cobalt and manganese ions, and Na + And SO 4 2- Ions. In order to discharge the wastewater after reaching the standard, the wastewater must be subjected to deamination, de-weighting and desalination treatment.
Because heavy metal ions in the salt-containing heavy ammonia nitrogen-containing wastewater are complexed with ammonia, the heavy metal ions can be removed only by deamination to break the complexation of the metal ions in the wastewater, and the heavy metal ions in the inorganic salt obtained in the desalting process can not exceed the standard only by completely removing the heavy metal ions, so the treatment process of the salt-containing heavy ammonia nitrogen-containing wastewater needs deamination-heavy removal-desalting. The patent 'a processing method and processing system of ternary cathode material industrial wastewater' (ZL 202010819833.6) adopts the technology of combining membrane separation, solid-liquid separation and evaporation crystallization phase to process the saline heavy ammonia nitrogen-containing wastewater generated in the production process of the ternary cathode material precursor, firstly, sulfuric acid solution is used as an absorbent, and the ammonia nitrogen in the wastewater is converted into ammonium sulfate by adopting the membrane separation to realize deamination; removing heavy metal ions in the deamination wastewater by filtering, wherein the heavy metal ions break the complex and form precipitate with alkali; after filtration, the supernatant was crystallized by evaporation to give sodium sulfate. The method can effectively treat the saline wastewater containing heavy ammonia nitrogen generated in the production process of the ternary cathode material precursor, but the ammonia nitrogen is not completely removed by membrane separation, and the operation problems of membrane leakage, pollution and the like and the secondary environmental problems of solid waste and the like generated by an invalid membrane exist. Accordingly, the method of stripping rectification deamination, filtering de-weight and evaporative crystallization desalination is commonly adopted in the industry for treating the salt-containing heavy ammonia nitrogen wastewater at present, the wastewater is firstly adjusted in pH and then is introduced into a rectifying tower, steam is introduced into the tower bottom for heating, an ammonia water product is extracted from the tower top, the deamination wastewater is extracted from the tower bottom, the pH value of the deamination wastewater is adjusted by alkali liquor so that heavy metal ions become hydroxide precipitates, and the salt-containing waste liquid is filtered and removed to obtain salt-containing waste liquid and then is evaporated, crystallized and desalted. In the three procedures of deamination, de-weight and desalination, the energy consumption of stripping, rectifying deamination and evaporative crystallization desalination is very high.
Therefore, the development of a new technology for reducing energy consumption is the key of the technical progress of the treatment process of the wastewater containing salt and heavy ammonia nitrogen. The inventor applies a patent of 'a method and a device for treating ammonia nitrogen wastewater and recovering ammonia' (application number 202010819833.6) by adopting a closed heat pump technology of vapor compression at the top of a deamination rectifying tower, and the comprehensive energy consumption can be reduced by more than 30% compared with the prior art. The MVR evaporation process is also commonly adopted in the existing industrial evaporation, crystallization and desalination process, so that the energy consumption of the process is greatly reduced.
However, the three processes of the existing treatment process for the wastewater containing salt and heavy ammonia nitrogen are relatively independent, the heat integration degree is poor, and the main problems comprise: 1) The heat pumps of the MVR evaporation-crystallization desalination process and the heat pump deamination process are mutually independent, so that the efficiency of the compressor is not improved; 2) In the MVR evaporation-crystallization desalination process, high-temperature condensed water obtained by condensing heating steam in an evaporator is directly discharged, so that energy waste is caused; 3) The filtering and de-weighting procedure is operated at normal temperature, the deamination wastewater needs to be cooled before entering the de-weighting procedure, and the de-weighting wastewater needs to be reheated after entering the desalting procedure, so that energy loss is caused.
Therefore, aiming at the problems of low heat integration degree and high energy consumption in the existing salt-containing diazo-containing wastewater treatment process, the development of an energy-saving treatment process is urgently needed to assist the realization of the national dual-carbon target in the important requirements of energy saving and carbon reduction in the industrial process of China.
Disclosure of Invention
In view of the above, the invention aims to provide a heat integration solution for the existing treatment process of the wastewater containing salt and heavy ammonia nitrogen, and the solution can effectively realize energy conservation in treatment of the wastewater containing salt and heavy ammonia nitrogen.
In order to achieve the purpose, the invention provides the following technical scheme:
1. the utility model provides an energy-saving contains salt and contains heavy ammonia nitrogen effluent disposal system, the system includes waste water treatment subsystem and heat pump subsystem, waste water treatment subsystem includes deamination tower 01, reboiler 03, filter 04, evaporimeter 05 and vaporization separator 06, the deamination tower 01 bottom of the tower is connected with reboiler 03 cold side, the deamination tower 01 bottom of the tower loops through the pipe connection with filter 04, vaporization separator 06, evaporimeter 05 cold side is connected with vaporization separator 06, the heat pump subsystem includes primary condenser 02 and compressor 07, primary condenser hot side and deamination tower 01 top of the tower are connected, primary condenser 02 cold side, compressor 07, reboiler 03 hot side loop through the pipe connection.
Preferably, the evaporator separator 06 is connected to the inlet of the compressor 07, and the hot side of the evaporator 05 is connected to the outlet of the compressor 07.
Preferably, the wastewater treatment subsystem further comprises a raw water preheater 10, wherein the raw water preheater 10 is arranged on the raw water inlet pipeline, the hot side of the raw water preheater 10 is connected with the hot side of the evaporator 05, and the cold side of the raw water preheater is connected with the deamination tower 01.
Preferably, the wastewater treatment subsystem further comprises a secondary condenser 08 and a spray liquid cooler 09, the hot side of the secondary condenser 08 is connected with the hot side of the primary condenser 02, the hot side of the secondary condenser 08 is communicated with an ammonia water discharge pipeline and an ammonia water spray pipeline, and the spray liquid cooler 09 is arranged on the ammonia water spray pipeline.
Preferably, the wastewater treatment subsystem comprises an alkali adding device, and the alkali adding device is arranged on an inlet pipeline of the filter 04; the wastewater treatment subsystem comprises an acid adding device which is arranged on an inlet pipeline of the evaporation separator 06.
Preferably, the wastewater treatment subsystem comprises one or more evaporative separators and a corresponding one or more evaporators.
2. An energy-saving treatment process for salt-containing heavy ammonia nitrogen-containing wastewater, which comprises the following steps:
(1) The method comprises the following steps of (1) introducing salt-containing heavy ammonia nitrogen-containing wastewater into a deamination tower to carry out deamination, extracting ammonia-containing steam from the tower top, allowing the ammonia-containing steam to enter a primary condenser to exchange heat with circulating water of a heat pump, partially condensing to obtain diluted ammonia water and concentrated ammonia steam, allowing part or all of the diluted ammonia water to flow back to the deamination tower, allowing the concentrated ammonia steam to enter a secondary condenser, condensing and spraying to absorb to obtain an ammonia water product;
(2) The heat pump circulating water exchanges heat in the first-stage condenser to form heat pump circulating steam, the heat pump circulating water is pressurized and heated by a compressor to form compressed steam, and then the compressed steam enters a reboiler and exchanges heat with deamination wastewater at the bottom of the deamination tower to be condensed and then returns to the first-stage condenser;
(3) Heating a part of the wastewater after deamination at the bottom of the deamination tower in a reboiler until the part of the wastewater is vaporized, returning the part of the wastewater to the deamination tower, separating the part of the wastewater by using a filter to remove heavy metal precipitates, sequentially feeding the wastewater after the deamination into an evaporation separator and an evaporator, and respectively extracting water vapor and crystalline salt obtained after evaporation.
Preferably, the heat pump circulating steam from the first-stage condenser is mixed with the water vapor extracted from the evaporation separator, and then the mixture is pressurized and heated by the compressor to form compressed steam which is respectively used as a heat source of the evaporator and a reboiler, the compressed steam becomes condensed water after heat exchange in the evaporator and is discharged outside, and the compressed steam returns to the first-stage condenser after heat exchange and condensation in the reboiler.
Preferably, after the wastewater is deaminated in the deamination tower, adding alkali to the wastewater after the deamination at the tower bottom to adjust the pH value and then entering a filter; after the weight is removed, the wastewater is firstly added with acid to adjust the pH value and then enters an evaporation separator.
Preferably, the condensed water discharged by the evaporator exchanges heat with the feeding wastewater and is discharged after heat is recovered.
Preferably, the evaporation of the wastewater after the weight removal is single-effect evaporation or multi-effect evaporation according to actual needs.
Preferably, when the wastewater after the weight removal is subjected to multi-effect evaporation, the first effect takes compressed steam as a heat source, the wastewater is evaporated step by step, and steam generated by the last effect evaporation is introduced to the compressor for compression.
The invention has the beneficial effects that:
(1) The invention discloses an energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system, wherein heat pumps in the deamination and desalination processes of ammonia nitrogen wastewater treatment are integrated into a heat pump system, heat pump circulating water forms heat pump circulating steam after heat exchange in a first-stage condenser at the top of a deamination tower, the heat pump circulating steam and steam extracted from the top of an evaporation separator enter a compressor to be pressurized and heated, and the obtained compressed steam is respectively used as heat sources of a reboiler and an evaporator, so that the energy consumption in the wastewater treatment process is effectively reduced. The heat pump of deamination and desalination process is integrated into a heat pump system, which can obviously improve the efficiency of the heat pump compressor and realize energy conservation.
(2) High-temperature condensate water generated in the evaporator is used for preheating raw feed water, so that waste heat utilization is realized, and energy utilization efficiency is improved.
(3) Waste water after deamination discharged by the deamination tower is directly sent into a filter for removing weight without cooling, so that energy loss caused by operation at normal temperature in the weight removing process in the prior art is avoided, and the problem of energy consumption increase caused by heating before desalting the waste water after weight removing at normal temperature is also solved.
(4) The technical scheme integrates and uses the energy of the three processes of deamination, heavy removal and desalination, obviously improves the process energy integration level and greatly reduces the energy consumption of the system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a diagram illustrating an energy-saving system for treating wastewater containing salt and heavy ammonia nitrogen according to the invention;
FIG. 2 is a diagram illustrating an energy-saving system for treating wastewater containing salt and heavy ammonia nitrogen according to embodiment 1 of the invention;
FIG. 3 is a process flow used in comparative example 1;
FIG. 4 is a flow chart of the process used in comparative example 2.
Reference numerals: the device comprises a deamination tower 01, a first-stage condenser 02, a reboiler 03, a filter 04, an evaporator 05, an evaporation separator 06, a compressor 07, a second-stage condenser 08, a spray liquid cooler 09, a raw water preheater 10, a compressor 11, a crystallizer 12, a centrifugal separator 13 and a pre-filtration cooler 14.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.
In order to facilitate a better understanding of the present invention, the following examples are given to illustrate, but not to limit the scope of the present invention.
As shown in figure 1 is an energy-saving contains salt and contains heavy ammonia nitrogen effluent disposal system, the system includes waste water treatment subsystem and heat pump subsystem, waste water treatment subsystem includes deammoniation tower 01, reboiler 03, filter 04, evaporimeter 05 and vaporization separator 06, deammoniation tower 01 tower bottom is connected with reboiler 03 cold side, deammoniation tower 01 tower bottom and filter 04, vaporization separator 06 loop through the pipe connection, evaporimeter 05 cold side is connected with vaporization separator 06, heat pump subsystem includes primary condenser 02 and compressor 07, primary condenser 02 hot side and deammoniation tower 01 top are connected, primary condenser 02 cold side, compressor 07, reboiler hot side 03 loop through the pipe connection. The evaporation separator 06 is connected with an inlet of the compressor 07, and a hot side of the evaporator 05 is connected with an outlet of the compressor 07. The wastewater treatment subsystem further comprises a raw water preheater 10, the raw water preheater 10 is arranged on a raw water inlet pipeline, a hot side is connected with a hot side of the evaporator 05, and a cold side is connected with the deamination tower 01. The wastewater treatment subsystem further comprises a secondary condenser 08 and a spray liquid cooler 09, the hot side of the secondary condenser 08 is connected with the hot side of the primary condenser 02, the hot side of the secondary condenser 08 is communicated with an ammonia water discharge pipeline and an ammonia water spray pipeline, and the spray liquid cooler 09 is arranged on the ammonia water spray pipeline. The wastewater treatment subsystem comprises an alkali adding device, and the alkali adding device is arranged on an inlet pipeline of the filter 04; the wastewater treatment subsystem comprises an acid adding device which is arranged on an inlet pipeline of the evaporation separator 06. The evaporation separator 06 and the evaporator 05 are both one. The vapor compression process in the heat pump subsystem can be set as a single compressor according to actual needs, or formed by combining a plurality of compressors in series and parallel.
The energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment process adopting the energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system comprises the following steps:
(1) The method comprises the following steps of (1) introducing salt-containing heavy ammonia nitrogen-containing wastewater into a deamination tower 01 to perform deamination, extracting ammonia-containing steam from the tower top, introducing the ammonia-containing steam into a primary condenser 02 to exchange heat with circulating water of a heat pump, partially condensing to obtain dilute ammonia water and concentrated ammonia steam, partially or completely refluxing the dilute ammonia water to the deamination tower 01, introducing the concentrated ammonia steam into a secondary condenser 08, and condensing and spraying to absorb to obtain an ammonia water product;
(2) The heat pump circulating water forms heat pump circulating steam after exchanging heat in the primary condenser 02, after being pressurized and heated by the compressor 07 to form compressed steam, enters the reboiler 03, exchanges heat with deaminated wastewater at the bottom of the deamination tower 01 and condenses, and then returns to the primary condenser 02;
(3) And a part of the wastewater after deamination at the bottom of the deamination tower 01 is heated in a reboiler 03 to be partially vaporized and returns to the deamination tower 01, a part of the wastewater enters a filter 04 to be separated to remove heavy metal precipitates, the wastewater after deamination sequentially enters an evaporation separator 06 and an evaporator 05, and water vapor and crystallized salt obtained after evaporation are respectively extracted.
The heat pump circulating steam from the primary condenser 02 and the water vapor extracted from the evaporation separator 06 are mixed and then pressurized and heated by the compressor 07 to form compressed steam which is respectively used as heat sources of the evaporator 05 and the reboiler 03, the compressed steam becomes condensed water after heat exchange in the evaporator 05 and is discharged after heat exchange with feed wastewater and heat recovery, and the compressed steam returns to the primary condenser 02 after heat exchange and condensation in the reboiler 03.
After the wastewater is deaminated in the deamination tower 01, the wastewater after the deamination at the tower bottom is added with alkali to adjust the pH value and then enters a filter 04. After the weight is removed, the wastewater is added with acid to adjust the pH value and then enters the evaporation separator 06.
Application example 1
FIG. 2 shows an optimized energy-saving treatment system for wastewater containing heavy ammonia nitrogen and containing salt, and the system shown in FIG. 2 is different from the system shown in FIG. 1 in that: the heat pump subsystem shown in fig. 2 further includes a compressor 11, the cold side of the first-stage condenser 02, the compressor 07 and the hot side of the evaporator 05 are sequentially connected through a pipeline, and the hot sides of the compressor 07, the compressor 11 and the reboiler 03 are sequentially connected through a pipeline. The system shown in fig. 2 also differs from the system shown in fig. 1 in that: the system shown in fig. 2 further comprises a crystallizer 12 for further crystallization of the inorganic salt product and a centrifuge 13, said evaporator 06, crystallizer 12 and centrifuge 13 being connected in circulation.
The difference in the process is that the heat pump circulating water forms heat pump circulating steam after exchanging heat in the primary condenser 02, the heat pump circulating steam is mixed with the water vapor extracted from the evaporation separator 06 and then is pressurized and heated by the compressor 07 to form compressed steam, one part of the compressed steam is used as a heat source of the evaporator 05, and the other part of the compressed steam is pressurized and heated by the compressor 11 to form secondary compressed steam which is used as a heat source of the reboiler 03; the inorganic salt product extracted from the evaporation separator 06 is further separated and purified by the crystallizer 12 and the centrifugal separator 13 in sequence, and the separated liquid is returned to the evaporation separator 06 again for evaporation treatment.
The system shown in fig. 2 was used for removing wastewater as follows: the inflow rate of the salt-containing heavy ammonia nitrogen-containing wastewater is 120m 3 H, ammonia nitrogen content of 7005.68mg/L and Na + The content of SO is 60023.20mg/L 4 2- The content is 120004.12mg/L, and the content of heavy metal ions: ni 2+ 315.96mg/L, co 2+ 78.86mg/L, mn 3+ It was 80.97mg/L. After treatment, the ammonia nitrogen content in the obtained water is 7.82mg/L and Na + The content of SO is 344.41mg/L 4 2- The content is 546.71mg/L, and the heavy metal content: ni 2 + 0.53mg/L, co 2+ 0.72mg/L, mn 3+ Is 1.16mg/L and reaches the national first-grade emission standard. The mass concentration of the obtained ammonia water product is 20.28 percent, and the concentration requirement of industrial ammonia water is met.
The power consumption for treating each ton of ammonia nitrogen wastewater is 60.31 ℃, the steam consumption is zero, and the comprehensive energy consumption is obviously reduced.
Comparative example 1:
comparative example 1 a system as shown in fig. 3 is used, and the process difference between the comparative example 1 and the application example 1 is that the heat pump circulating steam flowing out of the first-stage condenser 02 enters the compressor 07 to be compressed and heated, and the obtained compressed steam is directly sent to the reboiler 03. The water vapor extracted from the top of the evaporation separator 06 enters the compressor 11 to be pressurized and heated to be used as a heat source of the evaporator 05.
In this embodiment, the inflow rate of the ternary cathode material precursor wastewater is 120m 3 H, ammonia nitrogen content of 7005.68mg/L and Na + The content of SO is 60023.20mg/L 4 2- The content is 120004.12mg/L, the content of heavy metal ions: ni 2+ 315.96mg/L, co 2+ 78.86mg/L, mn 3+ It was 80.97mg/L. After treatment, the ammonia nitrogen content in the deamination water is 8.12mg/L and Na + The content of SO is 352.43mg/L 4 2- The content is 556.78mg/L, and the heavy metal content: ni 2+ 0.51mg/L, co 2+ 0.72mg/L, mn 3+ It was 1.13mg/L. The mass concentration of the obtained ammonia water product is 20.57 percent, and the concentration requirement of industrial ammonia water is met.
Because the heat pumps in the deamination process and the desalination process are not integrated, the efficiency of the steam compressor is reduced compared with that of the steam compressor in the application example 1, the power consumption is increased, the power consumption for treating each ton of ammonia nitrogen wastewater is 81.73 ℃, and the steam consumption is zero.
Comparative example 2
The system shown in the figure 4 is adopted in the comparative example 2, and the difference of the process from the application example 1 is that the normal temperature filtration process is adopted for the weight removal, the water after deamination flowing out from the bottom of the deamination tower 01 is cooled to about 40 ℃ by a pre-filtration cooler 14, and then enters a filter 04 after the pH value is adjusted by alkali liquor; raw steam is passed to the hot side of the evaporator 05 to supplement the heat.
In this embodiment, the inflow rate of wastewater is 120m 3 The ammonia nitrogen content is 7005.68mg/L and Na + The content of SO is 60023.20mg/L 4 2- The content is 120004.12mg/L, and the content of heavy metal ions: ni 2+ 315.96mg/L, co 2+ 78.86mg/L, mn 3+ It was 80.97mg/L. After treatment, the content of ammonia nitrogen in the deamination water is 7.91mg/L and Na + The content of SO is 352.38mg/L 4 2- The content is 557.82mg/L, and the heavy metal content: ni 2+ 0.48mg/L, co 2+ 0.65mg/L, mn 3+ It was 1.09mg/L. The mass concentration of the obtained ammonia water product is 20.16 percent, and the concentration requirement of industrial ammonia water is met.
Because low-temperature filtration is adopted, the energy consumption of the embodiment, including the power consumption and the raw steam consumption, is increased compared with the application example 1, the power consumption for treating each ton of wastewater is 68.14 ℃, the energy consumption of the desalting process is increased because the weight removing process is carried out at low temperature, the steam generated by the heat pump subsystem can not meet the requirement of the whole system, and 0.07kg of raw steam (0.40 MPa) is additionally required for treating each ton of wastewater in the desalting process.
In conclusion, the technical scheme integrates and uses the energy in the three processes of deamination, de-weighting and desalination, obviously improves the process energy integration level and greatly reduces the system energy consumption.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (12)

1. The utility model provides an energy-saving contains salt and contains heavy ammonia nitrogen effluent disposal system, a serial communication port, the system includes waste water treatment subsystem and heat pump subsystem, the waste water treatment subsystem includes deamination tower (01), reboiler (03), filter (04), evaporimeter (05) and vaporization separator (06), deamination tower (01) tower bottom is connected with reboiler (03) cold side, deamination tower (01) tower bottom and filter (04), vaporization separator (06) loop through the pipe connection, evaporimeter (05) cold side is connected with vaporization separator (06), the heat pump subsystem includes primary condenser (02) and compressor (07), primary condenser (02) hot side is connected with deamination tower (01) top, primary condenser (02) cold side, compressor (07), reboiler (03) hot side loop through the pipe connection.
2. The energy-saving system for treating wastewater containing heavy ammonia nitrogen and containing salt according to claim 1, wherein the evaporation separator (06) is connected with an inlet of the compressor (07), and a hot side of the evaporator (05) is connected with an outlet of the compressor (07).
3. The energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system as claimed in claim 1, wherein the wastewater treatment subsystem further comprises a raw water preheater (10), the raw water preheater (10) is arranged on a raw water inlet pipeline, a hot side is connected with a hot side of the evaporator (05), and a cold side is connected with the deamination tower (01).
4. The energy-saving salt-containing heavy ammonia nitrogen-containing wastewater treatment system according to claim 1, wherein the wastewater treatment subsystem further comprises a secondary condenser (08) and a spray liquid cooler (09), the hot side of the secondary condenser (08) is connected with the hot side of the primary condenser (02), the hot side of the secondary condenser (08) is communicated with an ammonia water discharge pipeline and an ammonia water spray pipeline, and the spray liquid cooler (09) is arranged on the ammonia water spray pipeline.
5. The energy-saving system for treating the wastewater containing the salt and the heavy ammonia nitrogen according to claim 1, wherein the wastewater treatment subsystem comprises an alkali adding device which is arranged on an inlet pipeline of a filter (04); the wastewater treatment subsystem comprises an acid adding device, and the acid adding device is arranged on an inlet pipeline of the evaporation separator (06).
6. The energy-saving system for treating wastewater containing heavy ammonia nitrogen and containing salt as claimed in claim 1, wherein the wastewater treatment subsystem comprises one or more evaporation separators and one or more corresponding evaporators.
7. An energy-saving treatment process for salt-containing heavy ammonia nitrogen-containing wastewater, which is characterized by comprising the following steps:
(1) The method comprises the following steps of (1) introducing salt-containing heavy ammonia nitrogen-containing wastewater into a deamination tower to carry out deamination, extracting ammonia-containing steam from the tower top, allowing the ammonia-containing steam to enter a primary condenser to exchange heat with circulating water of a heat pump, partially condensing to obtain diluted ammonia water and concentrated ammonia steam, allowing part or all of the diluted ammonia water to flow back to the deamination tower, allowing the concentrated ammonia steam to enter a secondary condenser, condensing and spraying to absorb to obtain an ammonia water product;
(2) The heat pump circulating water exchanges heat in the primary condenser to form heat pump circulating steam, the heat pump circulating steam is pressurized and heated by a compressor to form compressed steam, and then the compressed steam enters a reboiler and exchanges heat with the deamination wastewater at the bottom of the deamination tower for condensation and then returns to the primary condenser;
(3) Heating a part of waste water after deamination at the bottom of the deamination tower in a reboiler until the part of waste water is vaporized, returning to the deamination tower, separating a part of waste water in a filter to remove heavy metal precipitate, sequentially feeding the waste water after deamination into an evaporation separator and an evaporator, and respectively extracting water vapor and crystallized salt obtained after evaporation.
8. The energy-saving treatment process of wastewater containing salt and heavy ammonia nitrogen according to claim 7, characterized in that the heat pump circulating steam from the first-stage condenser is mixed with the steam extracted from the evaporation separator and then pressurized and heated by the compressor to form compressed steam which is used as the heat source of the evaporator and the reboiler respectively, the compressed steam is condensed water after heat exchange in the evaporator and discharged outside, and the compressed steam is returned to the first-stage condenser after heat exchange and condensation in the reboiler.
9. The energy-saving treatment process of the wastewater containing salt and heavy ammonia nitrogen as claimed in claim 7, characterized in that after deamination of the wastewater in the deamination tower, the wastewater after deamination at the bottom of the tower is added with alkali to adjust the pH value and then enters the filter; after the weight is removed, the wastewater is added with acid to adjust the pH value and then enters an evaporation separator.
10. The energy-saving treatment process of the wastewater containing the salt and the heavy ammonia nitrogen, according to claim 8, characterized in that the condensed water discharged from the evaporator is discharged after exchanging heat with the feed wastewater to recover heat.
11. The energy-saving treatment process of wastewater containing heavy ammonia nitrogen and containing salt as claimed in claim 7, wherein the evaporation of the wastewater after the weight removal is single-effect evaporation or multi-effect evaporation according to actual needs.
12. The energy-saving treatment process of wastewater containing salt and heavy ammonia nitrogen as claimed in claim 11, wherein when the wastewater after heavy removal adopts multi-effect evaporation, the first effect takes compressed steam as a heat source, the wastewater is gradually evaporated, and the steam generated by the last effect evaporation is led to a compressor for compression.
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