CN114804485A - Ammonium nitrate-containing evaporation and condensation wastewater zero-emission treatment system - Google Patents
Ammonium nitrate-containing evaporation and condensation wastewater zero-emission treatment system Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 155
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 28
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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
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a zero-emission treatment system for evaporative condensed wastewater containing ammonium nitrate, which comprises a condensed water raw water tank, a pH adjusting tank and a clarification tank; the output end of the clarification tank is connected with a multi-media filter; the output end of the multi-medium filter is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an R01 raw water tank; the output end of the R01 raw water tank is connected with an R01 device; the output end of the R01 device is respectively connected with an R02 raw water tank and an R03 raw water tank; the output end of the R02 raw water tank is connected with an R02 device; the output end of the R02 device is connected with an R02 water producing tank; the output end of the R02 water generating tank is connected with an R04 device; the output end of the R04 device is connected with an R04 water producing tank; the output end of the R03 raw material tank is connected with an R03 device; the output end of the R03 device is connected with an R03 concentration tank; the output end of the R03 concentration tank is connected with an MVR device; the invention greatly reduces the water consumption of industrial production, greatly relieves the water resource shortage and solves the problem of environmental pollution, and simultaneously, is convenient to recover solid byproducts.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to an evaporation and condensation wastewater zero-discharge treatment system containing ammonium nitrate.
Background
The waste water produced in many chemical and electronic industries of China contains ammonium nitrate. The wastewater is discharged into natural water, the content of ammonia in the water body seriously exceeds the standard, eutrophication is caused, the ecological balance of the water environment is destroyed, and serious harm is caused to the human health. The traditional methods of stripping, biochemical denitrification and the like easily cause secondary environmental pollution and high cost;
zero discharge means that the wastewater generated in the process production process can be recycled after treatment, and no waste liquid is discharged from a factory. The salt substances in the water are subjected to concentration, evaporation and crystallization to become solid and then are subjected to outsourcing treatment or are recycled as chemical raw materials. The wastewater zero discharge technology has the advantages of reducing water consumption, fully utilizing resources, saving cost, reducing environmental pollution and the like, and has obvious social, economic and environmental benefits.
The advantages of zero emission are as follows:
1. more than 90% of water can be recovered from the discharged sewage and reused for industrial production.
2. Greatly reduces the water consumption of industrial production and greatly relieves the problem of water resource shortage.
3. Thoroughly solves the problem of environmental pollution.
4. Recovering the solid by-product.
Disclosure of Invention
The invention aims to provide a zero-emission treatment system for evaporative condensation wastewater containing ammonium nitrate aiming at the defects of the prior art so as to solve the problems in the background art.
The invention is realized by the following technical scheme:
a zero-emission treatment system for evaporation and condensation wastewater containing ammonium nitrate comprises a condensed water raw water tank and a pH adjusting tank, wherein raw water obtained after cooling of a raw material liquid after pH adjustment enters a clarification tank; the output end of the clarification tank is connected with a multi-media filter; the output end of the multi-medium filter is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an R01 raw water tank; the output end of the R01 raw water tank is connected with an R01 device; the output end of the R01 device is respectively connected with an R02 raw water tank and an R03 raw water tank; the output end of the R02 raw water tank is connected with an R02 device; the output end of the R02 device is connected with an R02 water producing tank; the return end of the R02 device is connected with the R01 raw water tank (R02 concentrated water returns to the R01 raw water tank); the output end of the R02 water generating tank is connected with an R04 device; the output end of the R04 device is connected with an R04 water producing tank; the return end of the R04 device is connected with the R02 raw water tank (R04 concentrated solution returns to the R02 raw water tank); the output end of the R03 raw material tank is connected with an R03 device; the output end of the R03 device is connected with an R03 concentration tank; the return end of the R03 device is connected with the R01 raw water tank (R03 dialysate returns to the R01 raw water tank); the output end of the R03 concentration tank is connected with an MVR device.
Further, the pH adjusting device is a PE thickening plastic barrel, and the pH value of the liquid is adjusted by adopting a metering pump on-line adding medicament mode according to the feed liquid pH feedback condition.
Furthermore, the multi-media filter is a steel cylindrical tank body, quartz sand is used as a filtering medium, and the multi-media filter operates in a pressure mode.
Further, the filter backwashing water of the multi-media filter returns to the condensed water raw water pool through a pipeline.
Further, the concentrated water/backwashing water of the ultrafiltration device returns to the condensed water raw water tank through a pipeline.
Further, the R01 device, the R02 device, the R03 device and the R04 device are all reverse osmosis devices which are used for removing most ions in water by a membrane separation technology.
Further, the MVR device is used to evaporate the solution.
The invention has the beneficial effects that:
compared with the prior art, the zero discharge treatment system for the evaporation and condensation wastewater containing ammonium nitrate adopts the membrane separation technology to separate the ammonium nitrate from the wastewater, the concentrated water is finally evaporated by the MVR in the next process to obtain solid powder, the zero discharge of the wastewater is realized, the specific technical scheme comprises a pretreatment system, an R0 system and the MVR, and the total water treatment amount is 300m 3 D, the final produced water of the sewage treatment station is 270m3/d reuse water and 30m 3 D strong brine. The reclaimed water after treatment can be reused on a production line, the concentrated water is evaporated to obtain solid powder, the system can recover 90 percent of water from the discharged sewage and reuse the water for industrial production, and the reduction is greatly reducedThe water consumption of industrial production is greatly relieved, the problem of water resource shortage and environmental pollution is solved, and meanwhile, solid byproducts are convenient to recover.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of a continuous fluid separation system of the present invention;
FIG. 2 is a water quality meter of the inlet water according to the embodiment of the present invention;
FIG. 3 is a water quality chart of produced water according to an embodiment of the present invention.
In the drawings: 1-condensation water raw water pool; 2-a pH adjusting tank; 3-a clarification tank; 4-a multi-media filter; 5-an ultrafiltration device; 6-R01 raw water tank; 7-R01 apparatus; 8-R03 stock tank; 9-R03 apparatus; 10-R03 concentrating tank; 11-an MVR device; 12-R04 apparatus; 13-R04 water producing tank; 14-R02 water producing tank; 15-R02 apparatus; 16-R02 raw water tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that, unless otherwise specifically stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and can be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected through two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
As shown in fig. 1, the system for zero discharge treatment of evaporative condensed wastewater containing ammonium nitrate comprises a condensed water raw water tank 1 and a pH adjusting tank 2, wherein raw water obtained by cooling a raw material liquid after pH adjustment enters a clarification tank 3; the output end of the clarification tank 3 is connected with a multi-media filter 4; the output end of the multi-medium filter 4 is connected with an ultrafiltration device 5; the output end of the ultrafiltration device 5 is connected with an R01 raw water tank 6; the output end of the R01 raw water tank 6 is connected with an R01 device 7; the output end of the R01 device 7 is respectively connected with an R02 raw water tank 16 and an R03 raw material tank 8; the output end of the R02 raw water tank 16 is connected with an R02 device 15; the output end of the R02 device 15 is connected with an R02 water producing tank 14; the return end of the R02 device 15 is connected with the R01 raw water tank 6(R02 concentrated water returns to the R01 raw water tank 6); the output end of the R02 water generating tank 14 is connected with an R04 device 12; the output end of the R04 device 12 is connected with an R04 water producing tank 13; the return end of the R04 device 12 is connected with the R02 raw water tank 16 (the concentrated solution of R04 returns to the R02 raw water tank 16); the output end of the R03 raw material tank 8 is connected with an R03 device 9; the output end of the R03 device 9 is connected with an R03 concentration tank 10; the return end of the R03 device 9 is connected with the R01 raw water tank 6(R03 dialysate returns to the R01 raw water tank 6); the output end of the R03 concentration tank 10 is connected with an MVR device 11. The system for treating the zero discharge of the evaporation and condensation wastewater containing the ammonium nitrate separates the ammonium nitrate from the wastewater by adopting a membrane separation technology, concentrated water is finally evaporated by MVR in the next working procedure to obtain solid powder, the zero discharge of the wastewater is realized, the specific technical scheme comprises a pretreatment system, an R0 system and the MVR, and water is usedTotal treatment amount 300m 3 D, the final produced water of the sewage treatment station is 270m3/d reuse water and 30m 3 D strong brine. The normal water can be reused on the production line after treating, and the concentrated water obtains solid powder after the evaporation, guarantees that this system can retrieve 90% water from the sewage that discharges, and the reuse is in industrial production, and the industrial production's that has significantly reduced water consumption, very big release water resource deficient and solve environmental pollution's problem conveniently retrieves solid by-product simultaneously.
Specifically, in this embodiment, pH adjusting device is PE thickening plastic drum, according to the feed liquid pH feedback condition, adopts the measuring pump to add the medicament mode on line and adjusts liquid pH value.
Specifically, in the embodiment, the multi-media filter 4 is a steel cylindrical tank body, and the quartz sand is used as a filter medium, and is operated in a pressure mode. It should be noted that, in the overall treatment engineering, the multi-media filter 4 conforms to an ideal filter material with a small upper part and a large lower part, a gap distribution gradient is high in efficiency, the filtering speed can reach 8-10 m, the sewage interception capacity is large, the multi-media filter 4 can remove impurities such as silt, suspended matters and colloid in water and organisms such as algae, mechanical damage and pollution to the reverse osmosis membrane element are reduced, and the multi-media filter is widely applied to construction and reconstruction of a sewage station.
Specifically, in this embodiment, the filter backwashing water of the multi-media filter 4 is returned to the raw condensed water pool 1 through a pipeline. It should be noted that the main purpose of the pretreatment is to remove suspended matters, colloids, organic matters and other impurities which hinder the subsequent reverse osmosis operation in the raw water. The treatment facilities comprise a sedimentation water outlet tank, a raw water pump, a multi-media filter 4, a filter backwashing device and the like.
Specifically, in the embodiment of the present invention, the ultrafiltration device 5 is connected to the raw condensate water tank 1 through concentrated water and backwash water. The ultrafiltration device is composed of an ultrafiltration membrane separation technology, and the ultrafiltration membrane separation technology has the characteristics of small floor area, good effluent quality, high automation level and the like. Membrane separation techniques are a general term for a broad class of techniques. The water treatment mainly comprises micro-filtration, ultra-filtration, nano-filtration, reverse osmosis and the like. The membrane separation products all utilize the interception capability of a specially manufactured porous material to remove impurities with certain particle size in water in a physical interception mode. The filtration precision is related to the pore size of the filter membrane. Ultrafiltration can remove viruses, macromolecular substances, colloids, and the like. According to the experience of the engineering of our company, if ultrafiltration protection is not provided, electrodialysis is easily affected by bacteria/macromolecular organic matters and partial flocculated substances, finally the electrodialysis pollution risk is aggravated, and in severe cases, the membrane flux is reduced, so that online cleaning cannot be carried out.
Specifically, in this embodiment, the R01 device 7, the R02 device 15, the R03 device 9, and the R04 device 12 are all reverse osmosis devices for removing most of the ions in water by membrane separation technology. The desalination system is a key device, and the device removes most of ions, SiO2 and the like in water by using a membrane separation technology, thereby greatly reducing TDS. The R0 series device is to make part of raw water pass through the membrane along the direction vertical to the membrane, the salt and colloid substance in the water will be concentrated on the membrane surface, the rest raw water will take away the concentrated substance along the direction parallel to the membrane, and self-cleaning is carried out during the operation. The greater the water flux of the membrane element, the higher the recovery rate, the higher the concentration degree of the membrane surface, and due to the concentration effect, the different the substance concentration in the main water flow is caused by the substance solubility at the membrane surface, and the concentration polarization phenomenon is generated. Concentration polarization causes high salt concentration on the membrane surface, increases osmotic pressure of the membrane, causes salt transmittance to increase, and needs more energy consumption for increasing the pressure of feed water, and at the moment, a cleaning method is adopted for recovery.
Specifically, in this embodiment, the MVR device 11 is used to evaporate the solution.
The concentrated water may be evaporated using the process MVR device 11 to obtain a solid powder.
In conclusion, the wastewater firstly enters a pretreatment system, and the pretreatment mainly aims at removing impurities which are in the raw water and hinder the subsequent reverse osmosis operation, such as suspended matters, colloids, manganese ions, iron ions, organic matters and the like. The treatment facilities comprise a sedimentation water outlet tank, a raw water pump, a multi-media filter 4, a filter backwashing device and the like.
The wastewater treated by the pH adjusting system enters a multi-media filter 4, the multi-media filter 4 is a steel cylindrical tank body, quartz sand is used as a filtering medium, and the pressure type operation is carried out. In the whole treatment project, the filter material meets the ideal gap distribution gradient of small upper part and large lower part of the filter material, the efficiency is high, the filtering speed can reach 8-10 m, the sewage interception capacity is large, and the multi-medium filter 4 can achieve the filtering effect and can be widely applied to the construction and the reconstruction of a sewage station. The treated water amount is 15m3/h, and the outlet water ensures that NTU meets the water inlet requirement.
The effluent of the multi-medium filter 4 enters an ultrafiltration device 5, so that the NTU in the feed liquid is further reduced, and the requirement of the water quality entering the subsequent advanced treatment is ensured;
ultrafiltration can remove viruses, macromolecular substances, colloids, and the like. The type selection of the ultrafiltration membrane element selects a membrane with large water permeability, good chemical stability, good pollution resistance and good mechanical strength according to the characteristics of water quality. The ultrafiltration membrane is made of PVDF material, and has strong anti-fouling capability, good chemical stability and good mechanical strength. The pipeline of the ultrafiltration device 5 body is a UPVC pipe. The pipeline and valve in the ultrafiltration device 5 body adopt UPVC pipeline and valve, the UPVC pipeline and valve are chemical grade, 1.6 MPa. The service life of the film is more than 3 years. In any period within 3 years, the net output reaches a guaranteed value SDI less than or equal to 3. The pipeline design velocity of flow is 1.5 ~ 2.5m/s to reduce the pressure loss through the system, actual operation flux: 40 LMH. The ultrafiltration device 5 is arranged on the skid-mounted frame, the membrane elements are arranged in parallel, and a valve is arranged on each row of inlet and outlet water main pipes so as to be connected with the cleaning fluid inlet and outlet pipes during cleaning. The product water pipe, the water inlet pipe and the water outlet pipe of each ultrafiltration membrane component are provided with sampling points and necessary detection meters, and the quantity and the position can effectively supervise, diagnose and determine the defects of the system. All pipelines and joints are arranged on the frame, all brackets, fasteners, clamps and the like are included, and the frame is designed to meet the local seismic intensity. The ultrafiltration membrane module frame is provided with a leak detection device to detect the operation condition of the membrane element. And setting DCS to control full-automatic operation. The water yield of the system can meet the operation requirements of various ED working conditions. If a single membrane core goes out the problem, can cut off single row valve and change alone, do not influence the operation of other membrane cores.
And (4) the ultrafiltration effluent passes through an advanced treatment desalting unit. The advanced treatment desalination unit mainly adopts a reverse osmosis + MVR process to remove soluble solids and other substances in water, so that the produced water can meet the water requirements of reuse water.
Referring to fig. 2 and 3, the reverse osmosis membrane element is selected according to the water quality characteristics of circulating water, and is a membrane with large water permeability, high desalination rate, good chemical stability, good pollution resistance and good mechanical strength, and the membrane element is an enhanced low-pressure pollution high-desalination composite membrane of DOW company. Considering the time of membrane washing or maintenance required at ordinary times, the reverse osmosis membrane is designed according to the working time of 23 hours per day, the total water yield of reverse osmosis is 270m3/d, the water yield is 90%, and the membrane flux is 12.75 LMH.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (7)
1. The utility model provides a contain ammonium nitrate evaporation and condensation waste water zero release processing system which characterized in that: comprises a condensed water raw water tank and a pH adjusting tank, wherein raw water cooled by raw material liquid after pH adjustment enters a clarification tank; the output end of the clarification tank is connected with a multi-media filter; the output end of the multi-medium filter is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an R01 raw water tank; the output end of the R01 raw water tank is connected with an R01 device; the output end of the R01 device is respectively connected with an R02 raw water tank and an R03 raw water tank; the output end of the R02 raw water tank is connected with an R02 device; the output end of the R02 device is connected with an R02 water producing tank; the return end of the R02 device is connected with the R01 raw water tank; the output end of the R02 water generating tank is connected with an R04 device; the output end of the R04 device is connected with an R04 water producing tank; the return end of the R04 device is connected with the R02 raw water tank; the output end of the R03 raw material tank is connected with an R03 device; the output end of the R03 device is connected with an R03 concentration tank; the return end of the R03 device is connected with the R01 raw water tank; the output end of the R03 concentration tank is connected with an MVR device.
2. The system of claim 1, wherein the system is characterized in that: the pH adjusting device is a PE thickening plastic barrel, and the pH value of the liquid is adjusted by adopting a mode of adding a medicament on line by a metering pump according to the feedback condition of the pH of the feed liquid.
3. The system of claim 1, wherein the system is characterized in that: the multi-medium filter is a steel cylindrical tank body, quartz sand is used as a filtering medium, and the multi-medium filter operates in a pressure mode.
4. The system of claim 1, wherein the system is characterized in that: and the filter backwashing water of the multi-media filter returns to the condensed water raw pool through a pipeline.
5. The system of claim 1, wherein the system is characterized in that: and the concentrated water/backwashing water of the ultrafiltration device returns to the condensed water raw water tank through a pipeline.
6. The system of claim 1, wherein the system is characterized in that: the R01 device, the R02 device, the R03 device and the R04 device are all reverse osmosis devices which are used for removing most of ions in water by a membrane separation technology.
7. The system of claim 1, wherein the system is characterized in that: the MVR device is used to evaporate the solution.
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