CN209890424U - Treatment system for recycling nanofiltration concentrated solution - Google Patents
Treatment system for recycling nanofiltration concentrated solution Download PDFInfo
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- CN209890424U CN209890424U CN201822119744.1U CN201822119744U CN209890424U CN 209890424 U CN209890424 U CN 209890424U CN 201822119744 U CN201822119744 U CN 201822119744U CN 209890424 U CN209890424 U CN 209890424U
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- 238000001728 nano-filtration Methods 0.000 title claims abstract description 34
- 238000004064 recycling Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 119
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 238000001704 evaporation Methods 0.000 claims abstract description 68
- 230000008020 evaporation Effects 0.000 claims abstract description 68
- 239000003814 drug Substances 0.000 claims abstract description 53
- 239000000126 substance Substances 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 11
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 239000000701 coagulant Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 52
- 238000000034 method Methods 0.000 description 22
- 239000007787 solid Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- -1 hydroxyl ions Chemical class 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 238000011070 membrane recovery Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
- C02F1/048—Purification of waste water by 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
- C02F2303/02—Odour removal or prevention of malodour
Abstract
The utility model discloses a make processing system who receives and strains dense liquid resourceization, include: the chemical pretreatment subsystem is provided with a liquid coming tank, a fast stirring tank and a slow stirring tank which are connected in sequence, the liquid coming tank is provided with a nanofiltration concentrated liquid inlet, the fast stirring tank is respectively provided with an online pH meter and a first alkalinity medicine adding device, the first alkalinity medicine adding device is electrically connected with the online pH meter, the slow stirring tank is respectively provided with an online total alkalinity indicator and a second alkalinity medicine adding device, the second alkalinity medicine adding device is electrically connected with the online total alkalinity indicator, and the slow stirring tank is provided with a pretreated mixed liquid outlet; a mixed liquid outlet after pretreatment of the chemical pretreatment subsystem is sequentially connected with the MVR evaporation subsystem and the condensed water medicament treatment subsystem; and a reuse water outlet of the condensed water medicament treatment subsystem is connected with a circulating water replenishing port of the MVR evaporation subsystem. The system can realize the recycling of nanofiltration concentrated solution, and has low energy consumption and good treatment effect.
Description
Technical Field
The utility model relates to a concentrate field of handling especially relates to a make processing system who receives and strains concentrate resourceization.
Background
The domestic waste leachate is high-concentration organic wastewater and has the characteristics of multiple pollutant types, complex components and extremely unstable change. The leachate mainly comes from the precipitation in the landfill and the moisture contained in the garbage, and the pollution components of the leachate comprise organic matters, inorganic ions and nutrient substances. The main components are ammonia nitrogen, various dissolved ions, heavy metals, phenols, soluble fatty acids and other organic pollutants. The COD concentration of the waste leachate is generally 6000 to 30000ppm, the ammonia nitrogen concentration is generally 600 to 3000ppm, and the pH value is generally between 5 and 8.6. If the treatment is not proper, the garbage leachate can pollute the environment, harm underground water and cause serious damage to ecological civilization.
The popular percolate treatment process at the present stage comprises the following steps: the pretreatment + biochemistry + advanced treatment (membrane filtration) comprises a plurality of treatment processes such as flocculation, anaerobism, aerobism, ultrafiltration (MBR), NF/RO and the like, the system is complex, the affected factors are more, and the process can generate about 30 percent of high-concentration concentrated waste liquid and is difficult to treat due to the limited membrane recovery rate.
At present, two modes of recharging circulation treatment and evaporation treatment are generally adopted for high-concentration concentrated waste liquid. Among them, the recharge circulation treatment is easy to make the salt accumulation gradually affect the activity of the microorganism in the biological treatment process, and the cleaning period of the membrane becomes more frequent, resulting in an increase of the operation cost, which is not a long-term effective solution. And the evaporation treatment mainly adopts an evaporation mode of 'MVC + DI' to solve the high-concentration concentrated waste liquid. Because the concentrated waste liquid has the characteristics of high salt and high organic matter, a pretreatment system is not arranged before the concentrated waste liquid enters an MVC evaporation system, and the blockage of a preheater is often serious; after entering the evaporator, along with the evaporation and concentration of the high-concentration organic waste liquid, crystals such as calcium, magnesium and the like in the waste liquid are separated out and attached to the pipe wall, so that the evaporator is seriously scaled, the evaporation efficiency is seriously influenced, and the steam consumption is increased; the concentrated solution and condensed water generated by the evaporation system cannot be effectively treated after being treated by DI, and secondary pollution can be caused.
Disclosure of Invention
Based on the problem that prior art exists, the utility model aims at providing a make and receive processing system who strains dense liquid resourceization, enable to receive and strain the dense liquid and slowly dirty and extension equipment operating duration in the evaporation process, the evaporation generates the comdenstion water and reaches the reuse of reclaimed water standard after handling, realizes the dense liquid resourceization of receiving and straining of rubbish leachate.
The utility model aims at realizing through the following technical scheme:
the embodiment of the utility model provides a make processing system who receives and strains dense liquid resourceization, include:
the system comprises a chemical pretreatment subsystem, an MVR evaporation subsystem and a condensed water medicament treatment subsystem; wherein the content of the first and second substances,
the chemical pretreatment subsystem is provided with a liquid coming tank, a fast stirring tank and a slow stirring tank which are connected in sequence, the liquid coming tank is provided with a nanofiltration concentrated liquid inlet, the fast stirring tank is respectively provided with an online pH meter and a first alkalinity medicine adding device, the first alkalinity medicine adding device is electrically connected with the online pH meter, the slow stirring tank is respectively provided with an online total alkalinity indicator and a second alkalinity medicine adding device, the second alkalinity medicine adding device is electrically connected with the online total alkalinity indicator, and the slow stirring tank is provided with a pretreated mixed liquid outlet;
the pretreated mixed liquid outlet of the chemical pretreatment subsystem is sequentially connected with the MVR evaporator subsystem and the condensed water medicament treatment subsystem;
and a reuse water outlet of the condensed water medicament treatment subsystem is connected with a circulating water replenishing port of the MVR evaporation subsystem.
By the foregoing the utility model provides a technical scheme can see out, the embodiment of the utility model provides a make the processing system who receives filtration dense liquid resourceization, its beneficial effect is:
the chemical pretreatment subsystem is arranged in front of the MVR evaporation subsystem, the chemical pretreatment subsystem can control a dosing device to dose medicine and monitor the total alkalinity of the nanofiltration concentrated solution in real time according to the pH value, the alkalinity dosing device is controlled to ensure that the total alkalinity is always higher than the total hardness, granular solid suspended matters can be generated through chemical pretreatment, the suspended matters enter an evaporator of the MVR evaporation subsystem along with the nanofiltration concentrated solution, the aim of preventing and delaying the scaling of the evaporator is fulfilled through the friction of the solid suspended matters in the evaporation process, and the continuous operation of the evaporation system is ensured, so that more energy is saved; the MVR evaporation process is adopted, so that the energy is saved compared with the traditional multiple-effect evaporation; the condensed water is deeply treated in a medicament adjusting mode through condensed water medicament adjusting treatment to reach the standard of reclaimed water reuse. The system can realize the recycling of nanofiltration concentrated solution, and has low energy consumption and good treatment effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a treatment system for recycling nanofiltration concentrated solution provided by the embodiment of the present invention;
FIG. 2 is a process flow chart of a treatment method for recycling nanofiltration concentrated solution provided by the embodiment of the utility model;
in the figure: 1-a chemical pretreatment subsystem; 10-liquid coming tank; 11-a rapid stirring tank; 12-a slow stirring tank; 13-a first alkalinity dosing device; 14-online pH meter; 15-a second alkalinity dosing device; 16-on-line total alkalinity indicator; 2-MVR evaporation subsystem; 20-a buffer tank; 21-a feed pump; 22-water preheater; 23-a gas-water preheater; 24-a hot well; 25-a circulating water pump; 26-an evaporator; 27-a vapor compressor; 28-gas-liquid separator; 29-noncondensable gas absorption tower; 3-a condensed water medicament treatment subsystem; 30-a condensate pool; 31-a medicament conditioning device; 32-a filtration device; 33-condensate pump; 34-a condensing unit; 4-concentrated solution cooling treatment subsystem; 40-cooling the crystallizer; 41-a discharge pump; 42-a centrifuge; 43-coagulant dosing device; 44-sludge treatment equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a treatment system for recycling nanofiltration concentrated solution, which can make the nanofiltration concentrated solution release scale and prolong the operation time of the device during the evaporation process, and the evaporation generated condensed water reaches the reclaimed water recycling standard after being treated, thereby achieving the purpose of recycling the landfill leachate nanofiltration concentrated solution, comprising:
the system comprises a chemical pretreatment subsystem, an MVR evaporation subsystem and a condensed water medicament treatment subsystem; wherein the content of the first and second substances,
the chemical pretreatment subsystem is provided with a liquid coming tank, a fast stirring tank and a slow stirring tank which are connected in sequence, the liquid coming tank is provided with a nanofiltration concentrated liquid inlet, the fast stirring tank is respectively provided with an online pH meter and a first alkalinity medicine adding device, the first alkalinity medicine adding device is electrically connected with the online pH meter, the slow stirring tank is respectively provided with an online total alkalinity indicator and a second alkalinity medicine adding device, the second alkalinity medicine adding device is electrically connected with the online total alkalinity indicator, and the slow stirring tank is provided with a pretreated mixed liquid outlet;
the pretreated mixed liquid outlet of the chemical pretreatment subsystem is sequentially connected with the MVR evaporator subsystem and the condensed water medicament treatment subsystem;
and a reuse water outlet of the condensed water medicament treatment subsystem is connected with a circulating water replenishing port of the MVR evaporation subsystem.
Preferably, the first alkalinity dosing device adopts a sodium hydroxide pump; the second alkalinity medicine adding device adopts a sodium carbonate pump.
In the above processing system, the MVR evaporation subsystem includes:
the system comprises a buffer tank, a feed pump, a water-water preheater, a gas-water preheater, a hot well, a circulating water pump, an evaporator, a steam compressor and a gas-liquid separator; wherein the content of the first and second substances,
the water inlet of the water preheater is connected with the outlet of the pretreated mixed liquid of the chemical pretreatment subsystem through the buffer tank and the feed pump in sequence, and the water outlet of the water preheater is connected with the water inlet of the gas-water preheater;
a condensed water outlet of the water preheater is connected with the gas-liquid separator, and the gas-liquid separator is connected with the condensed water medicament treatment subsystem;
a circulating water replenishing port of the water preheater is connected with a condensed water recycling port of the condensed water medicament treatment subsystem;
the mixed liquid port of the gas-water preheater is connected with the bottom inlet of the hot well, the hot well is connected with an evaporator through a circulating water pump to form a circulating loop, and the non-condensed gas outlet of the evaporator is connected back to the gas inlet of the gas-water preheater;
the non-condensable gas outlet of the gas-water preheater is connected with the gas-liquid separator;
the evaporator is connected with the vapor compressor to form a circulating evaporation loop;
the hot well is provided with a concentrated solution outlet.
The above MVR evaporation subsystem further comprises: and the non-condensable gas absorption tower is connected with the gas-liquid separator.
In the above treatment system, the condensed water chemical treatment subsystem includes:
the device comprises a condensate water tank, a medicament conditioning device, a filtering device, a condensate water pump and a condensing device; wherein the content of the first and second substances,
the condensation water tank is connected with a gas-liquid separator of the MVR evaporation subsystem;
the condensed water tank is connected with the medicament conditioning device, the filtering device and the condensed water pump in sequence;
the evaporator of the MVR evaporation subsystem is connected with the condensate pump through the condensing device;
and the water outlet end of the condensate pump is connected with a circulating water replenishing port of a water preheater of the MVR evaporation subsystem.
The condensing device adopts an electric steam boiler or a condensed water tank;
the air outlet of the condensing unit is connected back to the evaporator of the MVR evaporation subsystem.
The processing system further comprises: and the concentrated solution cooling treatment subsystem is connected between the MVR evaporation subsystem and the liquid inlet tank of the chemical pretreatment subsystem.
The above-mentioned concentrated liquid cooling processing subsystem includes:
a cooling crystallizer, a discharge pump, a centrifuge, a coagulant dosing device and a sludge treatment device; wherein the content of the first and second substances,
the cooling crystallizer is connected with a concentrated solution outlet of an evaporator of the MVR evaporation subsystem, and the cooling crystallizer is connected with an incoming solution tank of the chemical pretreatment subsystem through the discharge pump and the centrifuge in sequence;
the coagulant dosing device is connected with the centrifuge;
and a sludge discharge port of the centrifugal machine is connected with the sludge treatment device.
Preferably, the coagulant dosing device adopts a PAM dosing pump.
The embodiment of the utility model provides a still provide a processing method that makes concentrated solution of receiving and filtering resourceization, adopt foretell system, include the following step (refer to fig. 2):
chemical pretreatment: after the treated nanofiltration concentrated solution enters a liquid tank of a chemical pretreatment subsystem of the system, the treated nanofiltration concentrated solution is firstly sent into a fast stirring tank, a sodium hydroxide solution prepared in advance is added into the nanofiltration concentrated solution through a first alkalinity medicine adding device until the pH value displayed by an online pH meter reaches 12-14, the solution is rapidly stirred in the fast stirring tank for 20 minutes, after a mixed solution enters a slow stirring tank, whether the sodium carbonate solution is added or not is determined according to an online total alkalinity indicator, the total alkalinity is always ensured to be more than 2000ppm, after the solution fully reacts for one and a half hours, the chemical pretreatment process is finished, and the mixed solution is added into an MVR evaporation subsystem;
MVR evaporation treatment: the mixed liquid after the chemical pretreatment and the full reaction sequentially undergoes preheating treatment, hot well evaporation and circulating liquid heat exchange in an MVR evaporation subsystem of the system, and condensed water generated in the evaporation process is cooled to recover heat and then is collected to a condensed water medicament treatment subsystem;
and (3) condensate water medicament adjustment treatment: and adding a medicament for removing pungent odor into the condensed water medicament treatment subsystem of the system for conditioning, and recycling the conditioned condensed water to the MVR evaporation subsystem for supplementing circulating cooling water.
In the above processing method, the MVR evaporation processing specifically includes:
the water and the gas-water preheater are sequentially fed into a buffer tank of an MVR evaporation subsystem of the system by a feed pump for preheating treatment, and then the water and the gas-water preheater enter a hot well for evaporation; the preheated mixed liquid in the gas-water preheater enters the hot well from the bottom, the granular solid settled at the bottom of the hot well is flushed to be in a suspension state, and then the granular solid is mixed with the circulating liquid and sprayed to the surface of the tube array of the evaporator, so that the scaling substances on the surface of the heat pipe bundle are ground in the falling process;
the steam generated by evaporation is heated and pressurized by a steam compressor and then enters the tubes of the evaporator to exchange heat with the circulating liquid;
the produced concentrated solution enters a concentrated solution cooling treatment subsystem from the hot well for treatment;
the malodorous gas generated in the evaporation process is absorbed by a noncondensable gas absorption tower and then is discharged;
after the condensed water generated in the evaporation process is cooled and the heat is recovered, the condensed water is collected into the condensed water tank;
in the above processing method, the MVR evaporation processing specifically includes:
the concentrated solution of MVR evaporation subsystem's hot well gets into the cooling crystallizer of concentrated liquid cooling processing subsystem, concentrated mixed liquor has a large amount of salinity to separate out after the heat transfer cooling, and the concentrated solution after will cooling is squeezed into centrifuge by the discharge pump and is carried out solid-liquid separation, and the solid is used for burning the electricity generation after sludge treatment through sludge treatment device carries out heat drying sludge treatment, contains the concentrated clear solution of the hydroxyl ion of high concentration, adds chemical pretreatment subsystem's the fluid reservoir that comes mixes with the concentrated solution of nanofiltration and decreases follow-up alkali feeding volume progressively.
The embodiments of the present invention will be described in further detail below.
As shown in fig. 1, an embodiment of the present invention provides a processing system for recycling nanofiltration concentrated solution, including: the system comprises a chemical pretreatment subsystem for chemically pretreating nanofiltration concentrated solution, an MVR evaporation subsystem and a condensed water medicament treatment subsystem for adjusting condensed water produced by evaporation, which are connected in sequence; the method can also comprise the following steps: and the concentrated solution cooling treatment subsystem is connected between the MVR evaporation subsystem and the chemical pretreatment subsystem.
The specific steps of the treatment system for treating the nanofiltration concentrated solution are as follows:
chemical pretreatment process: and (2) the nanofiltration concentrated solution enters a liquid inlet tank and is sent into a fast stirring tank, a sodium hydroxide solution with 20 to 50 percent of concentration which is prepared in advance is added into the nanofiltration concentrated solution through an alkalinity dosing pump until the pH value is about 13 displayed by an online pH meter, the mixture is rapidly stirred in the fast stirring tank for 20 minutes, after the mixed solution enters the slow stirring tank, whether the sodium carbonate solution is added or not is determined according to an online total alkalinity indicator, the total alkalinity is always ensured to be more than 2000ppm (more than the hardness), and after the mixture is fully reacted for half an hour, the chemical pretreatment process is finished.
MVR evaporation treatment: the mixed solution after full reaction is sent into water and a gas-water preheater for preheating treatment by a feed pump through a buffer tank, and then enters a hot well for evaporation; the preheated mixed liquid enters the hot well from the bottom, the granular solid settled at the bottom of the hot well is flushed to be in a suspension state, and then the mixed liquid is mixed with the circulating liquid and sprayed to the surfaces of the tubes, so that the scaling substances on the surfaces of the heat tube bundles are ground in the falling process. The steam generated by evaporation is heated and pressurized by a steam compressor and then enters an evaporator tube nest to exchange heat with the circulating liquid; the produced concentrated solution enters a cooling crystallizer from a hot well, a large amount of salt is separated out after heat exchange and cooling are carried out on the concentrated mixed solution, the cooled concentrated solution is pumped into a centrifuge by a discharge pump to carry out solid-liquid separation, the solid can be used for incineration power generation after being treated by heat drying sludge, and concentrated clear solution can enter an incoming liquid tank to be mixed with nanofiltration concentrated solution due to the fact that the concentrated clear solution contains high-concentration hydroxyl ions, so that the alkali adding amount is reduced. Malodorous gas generated by the system is absorbed by a noncondensable gas absorption tower and then is discharged; and after the condensed water generated in the evaporation process is cooled and the heat is recovered, the condensed water is collected into a condensed water tank.
And (3) condensate water medicament adjustment treatment: the condensed water enters a condensed water tank after being cooled and heat is recovered, and the effects of removing pungent smell and reducing ammonia nitrogen and COD are achieved by adding the wide-source GY-102 medicament for conditioning. Preparing a wide-source GY-102 medicament into a 5% solution, adding the solution according to the proportion of 4L solution/ton condensed water to adjust the evaporated nanofiltration concentrated solution condensed water, reacting for 15 minutes, and filtering to obtain the condensed water which can reach the standard of reclaimed water reuse and can be used for supplementing circulating cooling water, washing vehicles, greening and the like.
Compared with the prior art, the utility model at least has following advantage:
(1) the chemical pretreatment subsystem of the utility model is provided with an on-line pH meter, which can control the drug adding device to feed drug according to the pH value;
(2) the utility model discloses a chemistry preliminary treatment subsystem has set up online total basicity indicator, can real time monitoring receive and strain the total basicity of dense solution, guarantees through control basicity charge device that total basicity is greater than total hardness all the time.
(3) The utility model can generate granular suspended solid in the chemical pretreatment stage, the suspended solid enters the MVR evaporator along with the nanofiltration concentrated solution, the purpose of preventing and delaying the scaling of the evaporator is achieved through the friction of the suspended solid in the evaporation process, and the continuous operation of an evaporation system is ensured, so that the energy is saved;
(4) the utility model discloses a MVR evaporation process compares traditional multiple-effect evaporation more energy-conserving.
(5) The utility model discloses a to the advanced treatment of comdenstion water, make it reach the reuse of reclaimed water standard, realized will receive the purpose of straining dense solution resource utilization, have very high environmental protection and worth.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A treatment system for recycling nanofiltration concentrate is characterized by comprising:
the system comprises a chemical pretreatment subsystem, an MVR evaporation subsystem and a condensed water medicament treatment subsystem; wherein the content of the first and second substances,
the chemical pretreatment subsystem is provided with a liquid coming tank, a fast stirring tank and a slow stirring tank which are connected in sequence, the liquid coming tank is provided with a nanofiltration concentrated liquid inlet, the fast stirring tank is respectively provided with an online pH meter and a first alkalinity medicine adding device, the first alkalinity medicine adding device is electrically connected with the online pH meter, the slow stirring tank is respectively provided with an online total alkalinity indicator and a second alkalinity medicine adding device, the second alkalinity medicine adding device is electrically connected with the online total alkalinity indicator, and the slow stirring tank is provided with a pretreated mixed liquid outlet;
the pretreated mixed liquid outlet of the chemical pretreatment subsystem is sequentially connected with the MVR evaporator subsystem and the condensed water medicament treatment subsystem;
and a reuse water outlet of the condensed water medicament treatment subsystem is connected with a circulating water replenishing port of the MVR evaporation subsystem.
2. The treatment system for recycling a nanofiltration concentrate of claim 1, wherein the MVR evaporation subsystem comprises:
the system comprises a buffer tank, a feed pump, a water-water preheater, a gas-water preheater, a hot well, a circulating water pump, an evaporator, a steam compressor and a gas-liquid separator; wherein the content of the first and second substances,
the water inlet of the water preheater is connected with the outlet of the pretreated mixed liquid of the chemical pretreatment subsystem through the buffer tank and the feed pump in sequence, and the water outlet of the water preheater is connected with the water inlet of the gas-water preheater;
a condensed water outlet of the water preheater is connected with the gas-liquid separator, and the gas-liquid separator is connected with the condensed water medicament treatment subsystem;
a circulating water replenishing port of the water preheater is connected with a condensed water recycling port of the condensed water medicament treatment subsystem;
the mixed liquid port of the gas-water preheater is connected with the bottom inlet of the hot well, the hot well is connected with an evaporator through a circulating water pump to form a circulating loop, and the non-condensed gas outlet of the evaporator is connected back to the gas inlet of the gas-water preheater;
the non-condensable gas outlet of the gas-water preheater is connected with the gas-liquid separator;
the evaporator is connected with the vapor compressor to form a circulating evaporation loop;
the hot well is provided with a concentrated solution outlet.
3. The treatment system for recycling a nanofiltration concentrate according to claim 2, further comprising: and the non-condensable gas absorption tower is connected with the gas-liquid separator.
4. The treatment system for recycling nanofiltration concentrate of claim 1 or 2, wherein the condensed water medicament treatment subsystem comprises:
the device comprises a condensate water tank, a medicament conditioning device, a filtering device, a condensate water pump and a condensing device; wherein the content of the first and second substances,
the condensation water tank is connected with a gas-liquid separator of the MVR evaporation subsystem;
the condensed water tank is connected with the medicament conditioning device, the filtering device and the condensed water pump in sequence;
the evaporator of the MVR evaporation subsystem is connected with the condensate pump through the condensing device;
and the water outlet end of the condensate pump is connected with a circulating water replenishing port of a water preheater of the MVR evaporation subsystem.
5. The treatment system for recycling nanofiltration concentrate according to claim 4, wherein the condensation device adopts an electric steam boiler or a condensate water tank;
the air outlet of the condensing unit is connected back to the evaporator of the MVR evaporation subsystem.
6. The treatment system for recycling a nanofiltration concentrate according to claim 1 or 2, further comprising: and the concentrated solution cooling treatment subsystem is connected between the MVR evaporation subsystem and the liquid inlet tank of the chemical pretreatment subsystem.
7. The treatment system for recycling a nanofiltration concentrate of claim 6, wherein the concentrate cooling treatment subsystem comprises:
a cooling crystallizer, a discharge pump, a centrifuge, a coagulant dosing device and a sludge treatment device; wherein the content of the first and second substances,
the cooling crystallizer is connected with a concentrated solution outlet of an evaporator of the MVR evaporation subsystem, and the cooling crystallizer is connected with an incoming solution tank of the chemical pretreatment subsystem through the discharge pump and the centrifuge in sequence;
the coagulant dosing device is connected with the centrifuge;
and a sludge discharge port of the centrifugal machine is connected with the sludge treatment device.
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| CN106746129B (en) * | 2017-01-19 | 2020-08-14 | 启迪桑德环境资源股份有限公司 | Landfill leachate evaporation crystallization system |
| CN107129058A (en) * | 2017-05-08 | 2017-09-05 | 北京浦仁美华环保科技股份有限公司 | Waste water industry TPL preheats antiscaling process |
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