CN212669456U - Desulfurization waste water near zero release processing system - Google Patents
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Abstract
The utility model relates to a desulfurization waste water near-zero discharge treatment system, which comprises a desulfurization waste water adjusting tank, a primary reaction tank, a desliming mixing tank, a clarification tank, a mixed crystallization mixing tank, a tubular ultrafiltration membrane, an ultrafiltration water tank, a nanofiltration mechanism, a seawater desalination mechanism, a reverse osmosis mechanism and a concentrated crystallization mechanism; a concentrated water outlet of the nanofiltration mechanism is butted with the primary reaction tank, and a fresh water outlet of the nanofiltration mechanism is butted with the seawater desalination mechanism; a concentrated water outlet of the seawater desalination mechanism is in butt joint with the reverse osmosis mechanism; the concentrated water outlet of the reverse osmosis mechanism is butted with a concentration crystallization mechanism. The mixed crystallization mixing tank is connected with a return pipe to the desliming mixing tank, and the tubular ultrafiltration membrane is connected with a concentrated water return pipe to the mixed crystallization mixing tank; the clarification tank is connected the mud back flow to elementary reaction tank, sends surplus sludge to sludge dewatering mechanism through the mud pipeline in addition, and sludge dewatering mechanism passes through the back flow and connects desulfurization waste water equalizing basin again, and the system result is industrial salt, fresh water, mud solid useless, has realized near zero release of desulfurization waste water.
Description
Technical Field
The utility model relates to a desulfurization waste water's processing system.
Background
The impurities of the desulfurization wastewater are derived from flue gas and limestone for desulfurization; as the fire coal is rich in a plurality of heavy metal elements which are subjected to a series of chemical reactions at high temperature in the furnace to generate a plurality of different compounds, one part of the compounds is discharged out of a hearth along with slag, and the other part of the compounds enters a desulfurizing tower along with flue gas and is absorbed by limestone slurry to be dissolved in the slurry. The elements contained in the coal comprise F, Cd, Hg, Pb, Ni, As, Se, Cr and the like, and the elements can be dissolved into the desulfurization slurry along with the flue gas and are enriched in the slurry in repeated circulating use, and finally, the wastewater with the concentration exceeding the discharge standard is formed. Impurities contained in the desulfurization wastewater are mainly suspended matters, supersaturated sulfite, sulfate and heavy metals; many of which are a class of pollutants that require control in national environmental standards. Because the water quality of the desulfurization wastewater is different from that of other industrial wastewater, the treatment difficulty is large, and therefore, the desulfurization wastewater must be treated separately.
Publication No. CN111268834A discloses a desulfurization wastewater treatment system capable of recycling resources, which comprises a three-header mechanism, a chemical softening mechanism, a nanofiltration mechanism, a reverse osmosis mechanism, a resin adsorption mechanism, a bipolar membrane electrodialysis mechanism and a neutralization tank. The technology can effectively avoid the generation of mixed salt and prepare hydrochloric acid and sodium hydroxide solution, and the generated acid and alkali can be recycled in a power plant, thereby realizing zero emission and resource utilization of the desulfurization wastewater. The setting of the triple box mechanism, the chemical softening mechanism and the resin adsorption mechanism also improves the service life of the membrane component to a certain extent and reduces the problem of membrane pollution.
Publication No. CN111252937A discloses a method for treating desulfurization wastewater, comprising: s1, sending the desulfurization wastewater into a desulfurization buffer tank for buffer treatment; s2, feeding the desulfurization wastewater into a neutralization box for alkalization treatment; s3, sending the desulfurized wastewater after the alkalization treatment into a settling tank for heavy metal removal treatment and precipitation; s4, sending the effluent in the settling tank into a flocculation tank for flocculation treatment; s5, sending the effluent in the flocculation tank into a clarification tank for clarification treatment; s6, adding hydrochloric acid into the effluent of the clarification tank and discharging.
SUMMERY OF THE UTILITY MODEL
The desulfurization waste water quality characteristic of power plant is taken into account comprehensively, the utility model discloses a multi-process combined method utilizes new preliminary treatment technology, the novel membrane separation technology of multiclass and TMC hot membrane coupling to divide matter crystallization salt resourceization to handle to reach the waste water zero release and handle, and the purpose of water, salt (this application is mainly sodium chloride) dual resourceization.
The technical scheme of the utility model is that: a near-zero emission treatment system for desulfurization wastewater comprises a desulfurization wastewater adjusting tank, a primary reaction tank, a desliming mixing tank, a clarification tank, a mixed crystallization mixing tank, an external tubular ultrafiltration membrane, an ultrafiltration water tank, a nanofiltration mechanism, a seawater desalination mechanism, a reverse osmosis mechanism and a concentration crystallization mechanism which are sequentially arranged; a concentrated water outlet of the nanofiltration mechanism is butted with the primary reaction tank, and a fresh water outlet of the nanofiltration mechanism is butted with the seawater desalination mechanism; a concentrated water outlet of the seawater desalination mechanism is in butt joint with the reverse osmosis mechanism, and a fresh water outlet of the seawater desalination mechanism is in butt joint with the fresh water tank; a concentrated water outlet of the reverse osmosis mechanism is in butt joint with the concentrated crystallization mechanism, a fresh water outlet of the reverse osmosis mechanism is in butt joint with the fresh water tank, and a distilled water outlet of the concentrated crystallization mechanism is in butt joint with the fresh water tank; the mixed crystallization mixing tank is connected with a return pipe to the desliming mixing tank to realize water circulation desliming; the tubular ultrafiltration membrane is connected with a concentrated water return pipe to the mixed crystallization mixing tank, so that the growth of crystals in the mixed crystallization mixing tank is realized; the clarification tank is connected with a sludge return pipe to the primary reaction tank, and part of sludge is returned to the primary reaction tank; and the clarification tank is used for conveying the residual sludge to the sludge dewatering mechanism through a sludge pipeline, and the sludge dewatering mechanism is connected with the pressure filtrate return system of the sludge through a return pipe.
Preferably, the primary reaction tank, the desliming mixing tank, the clarification tank and the mixed crystallization mixing tank are used as pretreatment process sections of the desulfurization wastewater, and different precipitating agents are added into different tanks to keep different pH values in the tanks, so that the purpose of quality-divided precipitation treatment is achieved.
Preferably, the mixed crystallization mixing tank is divided into a plurality of compartments, the front compartment is used as a reaction tank to be respectively filled with lime and soda ash so as to form an emulsion, the emulsion passes through the rear compartment, and the rear compartment is used as a reaction sedimentation tank to achieve the effect of sedimentation and sludge discharge.
Preferably, the seawater and fresh water mechanism adopts a rolled reverse osmosis membrane.
Preferably, the concentration crystallization mechanism adopts TMC thermal film coupling fractional crystallization salt, the evaporation crystallization section adopts the combination of MVR vertical falling film concentration, MVR forced circulation evaporation crystallization and cooling crystallization, and industrial-grade sodium salt is separated out from the concentrated water from the reverse osmosis mechanism.
The implementation method of the desulfurization wastewater near-zero emission treatment system comprises the following steps:
1. the desulfurization waste water equalizing basin is used for collecting desulfurization waste water incoming water, including the mud pressure filtration liquid in the system, realizes the incoming water homogeneity through setting up mechanical stirring.
2. The primary reaction tank is used for putting a precipitator to precipitate the incoming water, and the precipitator is selected from one or more of calcium hydroxide, sodium hydroxide, organic sulfur and ferric chloride.
3. The desliming mixing tank is used for throwing a flocculating agent, such as PAM, to flocculate and settle the incoming water.
4. The clarification tank is used for desliming the incoming water and clarifying the incoming water.
5. Lime and soda are added into the mixed crystallization mixing tank to crystallize and separate out scaling substances in the water to form emulsion.
6. The tubular ultrafiltration membrane is used for carrying out solid-liquid separation on the emulsion to remove suspended matters, so that the quality of the incoming water reaches the condition of entering a nanofiltration mechanism.
7. The ultrafiltration water tank is used for collecting the water quality treated by the ultrafiltration membrane and regulating the pH value to be neutral and optimal by using hydrochloric acid.
8. The nanofiltration mechanism is used for separating monovalent ions in water and separating monovalent ions, multivalent ions and organic matters with the molecular weight of 200-1000.
9. The seawater desalination mechanism is used for concentrating incoming water and improving the salt content.
10. The reverse osmosis mechanism further concentrates the total dissolved solids TDS of the incoming water.
11. The concentration and crystallization mechanism realizes the quality-divided crystallization of salt in the incoming water.
12. The fresh water tank is used for collecting recoverable fresh water in the system.
13. The sludge dewatering mechanism performs filter pressing on the sludge to obtain sludge filter pressing liquid and sludge solid waste.
Compared with the prior art, the utility model has the advantages of: the treatment system realizes the collection of solid waste, fresh water and industrial salt of the desulfurization wastewater, has no sewage discharge, and has high system treatment efficiency, small medicament addition and low energy consumption.
Drawings
FIG. 1 is a schematic view of a near-zero emission treatment system for desulfurization wastewater in an embodiment of the present invention;
FIG. 2 is a schematic diagram of osmosis;
fig. 3 is a reverse osmosis schematic.
Detailed Description
The invention will be described in further detail with reference to the following examples, which are given by way of illustration and are intended to be illustrative of the invention and should not be construed as limiting the invention.
The embodiment relates to a nearly zero release processing system of desulfurization waste water, including desulfurization waste water equalizing basin, elementary reaction tank, mixing tank 1#, depositing reservoir, mixing tank 2#, tubular milipore filter, the ultrafiltration water tank that sets gradually, NF system, SWRO system, DTRO system, concentrated crystallization mechanism, still include the sheet frame filter-pressing equipment and the fresh water tank of being connected with the depositing reservoir. The concentration and crystallization mechanism adopts a self-made complete set of equipment of MVR vertical falling film concentration, MVR forced circulation evaporation crystallization and cooling crystallization, so that the recycling of the quality-classified crystallized salt is realized, and the separation of industrial sodium salts such as sodium chloride, sodium nitrate and the like is realized.
The primary reaction tank, the mixing tank 1#, the clarification tank and the mixing tank 2# are used as pretreatment process sections, the mixing tank 2# is connected with a return pipe to the mixing tank 1# to realize continuous desliming of the incoming water, and the sludge in the incoming water can be continuously deposited and collected; the tubular ultrafiltration membrane is connected with a concentrated water return pipe to the mixing tank 2# to realize the growth of crystals in the mixing tank 2# and ensure that the crystals are deposited together with the sludge.
The clarification tank is connected with a sludge return pipe to the primary reaction tank, and part of sludge is returned to the primary reaction tank; and the clarification tank is additionally used for conveying the residual sludge to the plate and frame filter pressing equipment through a sludge pipeline, and the plate and frame filter pressing equipment is connected with the desulfurization wastewater adjusting tank through a return pipe to enable the filter pressing liquid of the sludge to flow back to the system again.
A concentrated water outlet of the NF system is butted with the primary reaction tank, and a fresh water outlet of the NF system is butted with the SWRO system; a concentrated water outlet of the SWRO system is butted with the DTRO system, and a fresh water outlet of the SWRO system is butted with the fresh water tank; a concentrated water outlet of the DTRO system is in butt joint with a concentrated crystallization mechanism, a fresh water outlet is in butt joint with a fresh water tank, and a distilled water outlet of the concentrated crystallization mechanism is in butt joint with the fresh water tank.
The principle and the implementation method of the processing system are as follows:
1. because the desulfurization waste water fluctuates greatly, a desulfurization waste water adjusting tank needs to be arranged for homogenization. Mechanical stirring is arranged in the homogenizing pool, so that sediment deposition is avoided.
Adopt neotype preliminary treatment process, this process anterior segment adopts the mixed precipitation facility of reaction of concatenating, including desliming mixing tank (mixing tank 1#), depositing reservoir, mixed crystallization mixing tank (mixing tank 2#), adds different medicaments from this in the pond of difference, adjusts different pH, throws different medicaments to reach the getting rid of treating all kinds of different pollutants by the branch matter, and can adjust at any time in every region and add the medicine kind, make and reach the best and get rid of the effect. And a mixed crystallization mixing tank is arranged behind the clarification tank and is used as a water inlet tank of the tubular ultrafiltration membrane, sodium carbonate and magnesium oxide are added into the tank, mixed crystallization is carried out in the tank, and then concentrated water after ultrafiltration continuously flows back to grow crystals, so that excessive calcium ions added at the front end can be removed, and the flushing effect of the amount of sludge entering the tubular ultrafiltration membrane on the ultrafiltration membrane can be met. The pretreatment process section is provided with a plurality of reflux parts, and the reflux parts are used for reducing the dosage of the medicament, promoting the growth of related crystal cells and realizing the removal of various salts along with the deposition of sludge, so that a sedimentation tank can be saved, the one-time collection of solid wastes is realized, and the solid waste collection rate is integrally improved.
The multistage high-efficiency reaction sedimentation tank of the pretreatment process section is developed by fully considering the chemical reaction characteristics of various substances in water according to the requirements of removing scaling substances such as temporary hardness, permanent hardness, silicate and the like and various heavy metals in water, and has the characteristics of full reaction, medicament saving, good sedimentation and separation effects, high effluent quality and the like. Compared with the traditional sedimentation tank (lime softening) technology, the multistage high-efficiency reaction sedimentation tank technology has the following advantages: 1) the chemical reaction is complete because the raw water is high-hardness and high-alkalinity wastewater containing various heavy metals and silicates. Considering the factors that the chemical adding reaction conditions of various pollutants are different, a plurality of compartments are specially arranged, through the arrangement of the compartments, a certain amount of lime and soda ash are respectively added into the first reaction tank and the second reaction tank, various scaling substances in water are crystallized and separated out, but only emulsion is formed, the effect of precipitating and discharging sludge is achieved through the third reaction sedimentation tank, and the emulsion is formed, so that the emulsion has strong adsorption and coagulation effects on various pollutants in water. 2) The device is simple, the occupied area is small, and the multiple-effect reaction tank and the sedimentation tank are combined to form a whole, so that compared with the traditional mode, the land resource and the civil engineering cost of a user are greatly saved.
2. Adopts a membrane treatment process combining a plurality of membrane technologies. The tubular ultrafiltration membrane is adopted to carry out solid-liquid separation on the pretreated wastewater, and the tubular ultrafiltration membrane element is adopted, so that suspended particles in the water can be stably removed, and the water quality requirement of a subsequent nanofiltration membrane system is completely met. Because the components of the desulfurization wastewater are complex, the concentration of various suspended solids is high, and the operation condition of the pretreatment plays a decisive role in ensuring the reasonable specification, quantity and arrangement mode of membrane elements of the subsequent nanofiltration device under the condition of ensuring the reasonable design. The project adds an external tubular ultrafiltration membrane technology as a pretreatment process of nanofiltration. Compared with the traditional mechanical filtration pretreatment technology, the tubular ultrafiltration technology has the following advantages: 1) the produced water has high quality, the filtration precision of the tubular ultrafiltration membrane is generally less than 0.1 mu m, so suspended solids in water are almost completely removed, and simultaneously, the removal efficiency of organic microorganisms in water is high (the bacteria removal rate Log 6; the removal rate of the viruses is Log4), and further ensuring the effluent SDI15<3, far higher than the nanofiltration inlet water SDI15<5, thereby greatly relieving the pollution trend of a subsequent nanofiltration system and prolonging the cleaning period; 2) is insensitive to the fluctuation of the water quality of inlet water because the tubular ultrafiltration membrane adopts cross flow filtrationTherefore, even if the quality of the raw water fluctuates greatly, the produced water can be ensured to be in the same standard, and the stable operation of a subsequent system is ensured. 3) The occupied area is small, the external tubular ultrafiltration device and the nanofiltration device are all modular assembly equipment, and the output of a single set of equipment can reach 500m3Over/h, the traditional sedimentation tank is replaced, the land resources and the civil engineering cost of a user are greatly saved, and 4) the full-automatic operation is realized, and the operation is simple.
3. In order to meet the resource utilization of sodium salt, multivalent ions in water must be removed as far as possible, the aim can be achieved by using a nanofiltration membrane of an NF system, the nanofiltration membrane intercepts organic matters and multivalent salts, concentrated water flows back to a primary reaction tank, and monovalent ions such as chloride ions and sodium ions can permeate through the nanofiltration membrane. Because of considering to retrieve the industrial salt, in order to ensure the purity of exquisite industrial salt, the utility model discloses a system of receiving strains. Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, and the pore diameter range of the nanofiltration membrane is about several nanometers. The pore diameter range of the nanofiltration membrane is between that of a reverse osmosis membrane and that of an ultrafiltration membrane, the nanofiltration membrane has high removal performance on divalent and multivalent ions and organic matters with the molecular weight of 200-1000, and the removal rate on monovalent ions and small molecules is low. Compared with the reverse osmosis process, the operating pressure of the nanofiltration process is lower, and the pressure is set to be about 1.0MPa in the embodiment; meanwhile, the nanofiltration membrane has low removal rate of monovalent ions and small molecules and smaller osmotic pressure in the process, so that the energy can be saved by about 15 percent compared with the nanofiltration membrane under the same condition.
4. Because the salt content of inlet water of the system is about 1 ten thousand mg/L and evaporation crystallization is needed in the tail end process, a section of seawater desalination system (SWRO system) is arranged to carry out primary concentration on the concentrated water after nanofiltration so as to meet the salt content before evaporation and reduce the evaporation water amount. The seawater desalination membrane adopts a roll reverse osmosis membrane. When the dilute solution and the concentrated solution with the same volume are respectively arranged at two sides of a container, the middle part of the container is blocked by a semipermeable membrane, the solvent in the dilute solution naturally penetrates through the semipermeable membrane and flows towards the concentrated solution side, the liquid level at the concentrated solution side is higher than the liquid level of the dilute solution by a certain height to form a pressure difference, and an osmotic equilibrium state is achieved, wherein the pressure difference is osmotic pressure, as shown in figure 2. If a pressure greater than the osmotic pressure is applied to the concentrate side, the solvent in the concentrate will flow to the dilute solution in the opposite direction to the original direction of osmosis, a process known as reverse osmosis, as shown in fig. 3.
5. Fresh water enters a fresh water tank for collection and reuse after seawater desalination, concentrated water enters a 160 kg DTRO membrane system to further concentrate TDS to 120000mg/L, and the 160 kg DTRO membrane system is specially used for novel products developed aiming at high-salt high-concentration organic wastewater. The method can reduce and concentrate the high-salt high-concentration organic wastewater to the maximum extent and improve the evaporation and salt precipitation effects. The fresh water that DTRO came out can mix with municipal water supply and directly carry out the recycle cooling, and the quality of water that this embodiment came out DTRO reverse osmosis system directly discharges into fresh water tank.
And 6, TMC hot film coupling quality-grading crystallization salt recycling technology. And the evaporation crystallization section adopts a self-made complete set of equipment of MVR vertical falling film concentration, MVR forced circulation evaporation crystallization and cooling crystallization. Can separate out sodium chloride, sodium nitrate and other industrial sodium salts from 160 kg of DTRO concentrated water, thereby achieving the recycling of salt resources.
7. Removing solid waste: residual sludge discharged from the clarification tank is subjected to filter pressing and dehydration through a plate frame, a corresponding hazardous waste treatment resource unit is entrusted to treat the residual sludge in a solid waste form, and filter pressing liquid flows back to the desulfurization wastewater regulating tank and circulates in the system.
Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a desulfurization waste water near zero release processing system which characterized in that: the device comprises a desulfurization wastewater adjusting tank, a primary reaction tank, a desliming mixing tank, a clarification tank, a mixed crystallization mixing tank, an external tubular ultrafiltration membrane, an ultrafiltration water tank, a nanofiltration mechanism, a seawater desalination mechanism, a reverse osmosis mechanism and a concentration crystallization mechanism which are arranged in sequence; a concentrated water outlet of the nanofiltration mechanism is butted with the primary reaction tank, and a fresh water outlet of the nanofiltration mechanism is butted with the seawater desalination mechanism; a concentrated water outlet of the seawater desalination mechanism is in butt joint with the reverse osmosis mechanism, and a fresh water outlet of the seawater desalination mechanism is in butt joint with the fresh water tank; a concentrated water outlet of the reverse osmosis mechanism is in butt joint with the concentrated crystallization mechanism, a fresh water outlet of the reverse osmosis mechanism is in butt joint with the fresh water tank, and a distilled water outlet of the concentrated crystallization mechanism is in butt joint with the fresh water tank;
the mixed crystallization mixing tank is connected with a return pipe to the desliming mixing tank to realize water circulation desliming; the tubular ultrafiltration membrane is connected with a concentrated water return pipe to the mixed crystallization mixing tank, so that the growth of crystals in the mixed crystallization mixing tank is realized; the clarification tank is connected with a sludge return pipe to the primary reaction tank, and part of sludge is returned to the primary reaction tank; and the clarification tank is used for conveying the residual sludge to the sludge dewatering mechanism through a sludge pipeline, and the sludge dewatering mechanism is connected with the pressure filtrate return system of the sludge through a return pipe.
2. The desulfurization wastewater near-zero emission treatment system of claim 1, characterized in that: the primary reaction tank, the desliming mixing tank, the clarifying tank and the mixed crystallization mixing tank are used as pretreatment process sections of the desulfurization wastewater.
3. The desulfurization wastewater near-zero emission treatment system of claim 1, characterized in that: the mixed crystallization mixing tank is divided into a plurality of compartments, the front compartment is used as a reaction tank, lime and sodium carbonate are respectively added to form emulsion, the emulsion passes through the rear compartment, and the rear compartment is used as a reaction sedimentation tank to achieve the effect of sedimentation and sludge discharge.
4. The desulfurization wastewater near-zero emission treatment system of claim 1, characterized in that: the seawater desalination mechanism adopts a roll-type reverse osmosis membrane.
5. The desulfurization wastewater near-zero emission treatment system of claim 1, characterized in that: the concentration crystallization mechanism adopts TMC thermal film coupling dual crystallization salt, the evaporation crystallization section adopts the combination of MVR vertical falling film concentration, MVR forced circulation evaporation crystallization and cooling crystallization, and industrial-grade sodium salt is separated out from the concentrated water from the reverse osmosis mechanism.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114790055A (en) * | 2022-03-21 | 2022-07-26 | 江苏海岳环境工程有限公司 | Zero-discharge system for cement desulfurization wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114790055A (en) * | 2022-03-21 | 2022-07-26 | 江苏海岳环境工程有限公司 | Zero-discharge system for cement desulfurization wastewater |
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Address after: No.7 HuanChuan Road, Huangtu Town, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: Jiangsu Kunyi Environmental Technology Co.,Ltd. Address before: No.7 HuanChuan Road, Huangtu Town, Jiangyin City, Wuxi City, Jiangsu Province Patentee before: JIANGSU KUNYI ENVIRONMENTAL ENGINEERING Co.,Ltd. |