CN207313347U - A kind of dense salt waste water divides salt treatment system - Google Patents

A kind of dense salt waste water divides salt treatment system Download PDF

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CN207313347U
CN207313347U CN201721049133.3U CN201721049133U CN207313347U CN 207313347 U CN207313347 U CN 207313347U CN 201721049133 U CN201721049133 U CN 201721049133U CN 207313347 U CN207313347 U CN 207313347U
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崔成华
韩显斌
刘艳军
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KAIDI WATER SERVICE CO Ltd WUHAN
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KAIDI WATER SERVICE CO Ltd WUHAN
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Abstract

Salt treatment system, including pretreatment unit, concentration is divided to divide salt device and evaporated crystallization device the utility model discloses a kind of dense salt waste water;Concentration divides salt device to include:Secondary concentration mechanism;Second order reaction mechanism, including three header of sequentially connected level-one, level-one clarifying basin, three header of two level and two level clarifying basin;Fen Yan mechanisms, including sequentially connected more medium filter, NF membrane concentrating and separating device and dope pond;NF membrane concentrating and separating device is connected with second medicament dispenser.The utility model divides salt device to be concentrated pretreated dense salt waste water by concentration, after concentration by second order reaction mechanism add medicament reacted, flocculation sediment, filtering, and film is carried out by NF membrane concentrating and separating device and divides salt treatment, crystallize to form pure salt in favor of recycling easy to subsequent evaporation, and NF membrane concentrating and separating device separates that the dense salt to be formed is reflowable to be used as softening agent, which obviate the processing of dense salt and reduce the injected volume of softening agent, reduce operating cost.

Description

A kind of dense salt waste water divides salt treatment system
Technical field
Water technology is the utility model is related to, divides salt treatment system more particularly, to a kind of dense salt waste water.
Background technology
With industrial expansion, water consumption and displacement are very huge, and country promulgates therewith《Economizing energy law》、《Ring Border Protection Code》With accordingly with water, drainage charge policy (water resources taxes, drainage fee, exceeded take), in the recent period with《Water pollution is prevented Only action plan》And industry-by-industry《Water-saving planning》Progressively implement Deng as defined in, environmental protection, resource circulation utilization and can hold Continuous development strategy has provided the necessary qualified discharge of industrial wastewater, advanced treating and has encouraged further processing to zero-emission, emission reduction, limit Row is until zero-emission has been the inexorable trend of policy guidance, i.e., waste water needs to carry out recycling, harmless treatment to zero-emission.
Industrial wastewater handle and reuse during, as dual treatment and step reuse string are used, waste water salt content by Edge up height, and dense salt waste water is formd when TDS values reach more than 2000mg/L.The performance shape of this dense salt waste water in the industrial production Formula mainly have the flue gas desulfurization waste-water of coal-burning boiler, desalted water produce in RO concentrated waters, recirculating water blowdown water etc., they remove saliferous Amount is high outer, and contain toward contact has one compared with the pollutants such as high suspended matter, hardness, COD, silicon, fluoride and oil, advanced treatment and reclamation Determine difficulty, advanced treatment process mainly pre-processes plus bi-membrane method (UF+RO) processing, the RO processing rate of recovery 60~75%, depth The TDS value rises that dense salt waste water is discharged after processing reach more than 5000mg/L.
The scarcity of water resource caused by developing industry production and pollution getting worse, the recycling to industrial wastewater seem It is more and more important, it is scientific research personnel's research and design reverse osmosis CRO of concentrated water, efficiently reverse osmosis in order to improve the industrial wastewater rate of recovery HERO, the electrodialysis of falling level EDR, the reverse osmosis MCRO of multistage concentrated water, the reverse osmosis DTRO of dish periosteum, vibrating membrane VESP, membrane distillation MD, change Property film WRO/STRO, positive infiltration FO etc..
The TDS values that dense salt waste water is discharged after these special membranes concentrate decrement treatment continue rise and reach 20000mg/L Above (experiment reaches as high as 200000mg/L), main component is except for sodium chloride, specific dense also containing impurity such as sodium sulphate, COD Demagnification number (decrement degree) and system intake the pollutants such as COD in (dense salt waste water), hardness, silicon, oil removal degree it is related. Belong to super density wastewater, row is big to environmental hazard outside this super density wastewater, and few suitable occasions can receive utilization, it is necessary to properly Disposal, and it has been that processing is invalid to it generally to concentrate Decrement Technique (including embrane method, electrodeionization etc.), need to use hot method etc. especially The disposal options of this super density wastewater are currently had the grey consumption of grey field punching, flue spray drying, evaporation pond, evaporation by concentration technique Crystallization etc., is described as follows:
(1) grey field punching ash consumption
This method is widely used by power plant many years ago, and desulfurization wastewater is often sprayed by conveying dedusting field.But fire in recent years Coal-fired plant uses Dry-ash System more, it is burned after lime-ash conveyed quality raw materials of the cement plant as manufacture cement.Due to dense Reduction end surpasses the components such as the chlorion of density wastewater high-content and has a great influence to Cement Quality, and dry ash passes through super density wastewater damping Afterwards, economic loss is larger, so the waste water dis posal mode does not consider further that use generally.
(2) flue is spray-dried
Flue spray drying technology is to surpass end in density wastewater atomizing spray to flue, or after partial fume is drawn The drying of waste water is realized in single spray dryer, tail end wastewater is evaporated using smoke temperature.Flue spray drying needs root According to flue gas flow, the suitable spray amount of heat Calculation flue, and according to the performance test data of nozzle, with reference to flue flow field Variation Features, preferred arrangement nozzle.The flue spray drying application of tail end wastewater is less, has uncertainty, there are certain wind Danger.After this external flue increase new process such as denitration and flue dedusting, smoke temperature has become relatively low, has tentative application case to show Show, tail end wastewater, which sprays into flue, can cause the Partial Blocking of serious fouling and flue.Since smoke temperature becomes low factor, cigarette is sprayed into The tail end wastewater in road may make the property of flue gas and flue dust change, and the operation to equipment such as dedusters can produce unfavorable shadow Ring.Therefore, tail end wastewater sprays into flue, it is necessary to solve the problems, such as that waste water evaporation drying salinity solid is settled in flue, gathered, The problems such as also needing to solve the fouling of spraying system.
(3) evaporation pond
Tail end wastewater is emitted into evaporation pond and carries out natural evaporation, can also increase on evaporation pond and be evaporated using mechanical spraying Device, makes tail end wastewater that water droplet to be dispersed as to the droplet of 100 μm or so of diameter by quick runner, the negative pressure formed by impeller The haze of high 8m, diameter 15m or so are formed, effectively increases water meter area, accelerates moisture evaporation using natural evaporation condition, The organic matters such as salinity and COD in water are fallen back in small-sized evaporation pond body, realize the zero-emission of waste water.Steamed using evaporation pond Hair, it is necessary to be evaporated area, storage pool volume calculations according to power plant's locality meteorological condition, will also to evaporation pond bottom and surrounding into Row seepage prevention design.Past factory (being usually the chemical plant of the close desert and Gobi in NORTHWEST CHINA area) builds evaporation pond and is completely dependent on Natural evaporation, factory need enough idle vacant lot (desert and Gobi area) and annual sufficiently large sunshine evaporation capacity just to examine Consider.
(4) evaporative crystallization
Evaporative crystallization is that waste water is evaporated under the high temperature conditions, and all moisture in addition to solid crystal water are with steam Form discharge system, forms high-quality fresh water after condensed, and the material such as salinity discharges system after dehydration in solid form in water System.Traditional evaporation and crystallization system mainly includes two parts, and first half is evaporator, and waste water is evaporated concentration, and 95% Waste water above can be converted into high-quality fresh water;Latter half is crystallizer, and the slurries of evaporator discharge are crystallized into crystallizer The slurries of high concentration (200,000 ppm of TDS >) are mainly processed into crystalline solid particle, crystallizer row by processing in crystallizer The dense slag of solid gone out is also needed by being dehydrated and can just pack after drying process, and the solid waste of pack is recyclable according to its component Using or landfill stabilization.At present, Europe, north America region evaporative crystallization treatment process have been successfully applied to desulfurization wastewater processing, such as The lily magnolia power plant of Las Vegas, US, the Ya Tan power plant of Missouri, USA, Enel power plant of Italy etc., realize waste water zero Discharge.Domestic thermal power plant is to tail end wastewater using the less of evaporative crystallization advanced treating, and Guangdong Province riverhead power plant is to desulfurization at present Waste water is evaporated crystallization treatment, is that domestic first hand realizes waste water zero using " pretreatment+evaporation+crystallization " treatment process The thermal power plant of discharge.But these power plant are taken up a large area using evaporative crystallization facility, and operating cost remains high, operation operation is multiple Miscellaneous, equipment maintenance cost is high.
U.S.'s " VACOM external heat exchanging types evaporative crystallization technique ", i.e., external heat exchange high power circulation Flash Type mechanical vapour are pressed again Contracting evaporation and crystallization system, first will evaporation and two high energy consumption process integration of crystallization to carrying out one-stop processing in 1 flash tank, Concentrate is arranged outside flash tank and reaches the concentration (400,000 ppm of TDS >) that magma is arranged outside crystallizer, crystallization is quickly formed after being arranged outside magma Salt solid, salt solid is can obtain after dehydration and drying.
It is comprehensive that super density wastewater is had a great influence using grey field sprinkling and evaporation pond evaporation by local environmental conditions with for, and Surrounding enviroment can be impacted, or the risk there are polluted underground water, do not consider.
Flue spray drying technology is still immature at present, super density wastewater flue is caused fouling and block the problems such as also in Conceptual phase, without good solution, and after salt solid particulate matter enters ash content, to follow-up dedusting, desulphurization denitration facility Necessarily influenced caused by meeting, lime-ash quality can also be had an impact.All above-mentioned influences, presently compared with it is difficult to predict, Need further to study.But consider that it is compared to evaporative crystallization technique, the factors such as investment and performance driving economy are good, further Fully it is contemplated that using after research demonstration.
Super density wastewater evaporative crystallization treatment process has at home and abroad had more successful case, and technology is more mature, at present The technology mainly used has multiple-effect evaporation MED, falling film type MVR, external heat exchange high power circulation Flash Type VACOM technologies:Wherein VACOM technologies belong to a kind of new MVR technologies introduced from the U.S., are used at home as a kind of new evaporative crystallization technique It is limited, it is currently under in wideling popularize.For super density wastewater after evaporative crystallization is handled, waste water almost all becomes steam condensate (SC) Utilization is collected, and the impurity such as salt in waste water all crystallizes out and forms crystal salt solid, this solid salt is removed containing a large amount of Outside sodium chloride, also containing other all kinds of impurity such as sodium sulphate, organic matter, belong to mixed salt (being also carnallite), so crude mixed salt It is difficult to be sold to the resource reusing such as salt chemical engineering company as raw material, can only be used on a small quantity as deicing salt or weaving dying agent, this The yield of kind mixed salt is per hour up to 1 ton to tens of tons, and factory floor space is limited, and long-term production is then nowhere stacked, and largely stacks one Place can form dangerous waste, and the disposal costs as dangerous waste disposal are very high (about 4000 yuan RMB/ tons), and enterprise can not bear.
So current China using evaporative crystallization technique carry out dense salt wastewater zero discharge processing project be primarily present it is following The problem of two aspects:
(1) the crystal salt solid that evaporative crystallization produces belongs to mixed salt, and the comprehensive utilization such as salt chemical engineering company does not receive this Kind mixed salt, a large amount of stack can become dangerous waste, and as the costly of dangerous waste disposal, enterprise does not almost afford to do such great number Dangerous waste disposal costs.
(2) system is because dense salt waste water quality is complicated, also cloudy containing divalence such as sulfate, calcium, magnesium in addition to sodium, chloride Cation, and containing the impurity such as all kinds of COD, silicon, oil, the technological process that this allows for processing is complicated and tediously long, thus brings and is System operating cost remains high, and the degree of automation is low, and operation operation heavy workload, the difficulty of repair and maintenance also increases, makes therewith It is difficult to obtain system operation.
As south China be avoid waste water quality pollution from having been carried out wastewater zero discharge project have Heyuan power plant, three Aquatic benefit power plant, Meishan, changxing, zhejiang Province power plant, Nantong prince's paper industry etc., have also had the more Coal Chemical Engineering Project in northern China water-deficient area also Wastewater zero discharge project is implemented, but all there are the above problem after the operation of these projects, as a result so that the project gone into operation is basic Design cannot be reached to implement purpose and become the trouble and burden of enterprise.
Therefore, handle to use when dense salt waste water is particularly super density wastewater and divide salt technology so that the salt finally obtained is consolidated Body is pure salt, and this pure salt can be sold to the resource reclaim such as salt chemical engineering company and be used, and this point of salt technology is to thoroughly real Simultaneously harmless treatment has important practical significance existing dense salt waste water reclaiming.
Utility model content
The purpose of the utility model is to overcome above-mentioned technical deficiency, and propose a kind of dense salt waste water divides salt treatment system, Solve the technical problem that dense salt wastewater treatment time-division salt difficulty is big in the prior art, operating cost is high.
To reach above-mentioned technical purpose, a kind of dense salt waste water of the technical solution of the utility model offer divides salt treatment system System, including pretreatment unit, concentration divide salt device and evaporated crystallization device;The concentration divides salt device to include:
Secondary concentration mechanism, its water inlet end be connected with the pretreatment unit and be used for by pretreated dense salt waste water into Row concentration;
Second order reaction mechanism, it is clear that it includes sequentially connected three header of level-one, level-one clarifying basin, three header of two level and two level Clear pond;Three header of level-one includes three header body of level-one and three babinets with three header body of level-one are equipped with respectively The first medicament delivery device, second medicament dispenser and the 3rd medicament delivery device;Three header of two level includes three header of two level Body and the 4th medicament delivery device and the 5th medicament delivery device being connected with three header body of two level;
Fen Yan mechanisms, it includes sequentially connected more medium filter, NF membrane concentrating and separating device and dope pond;It is described more The water inlet end of medium filter is connected with the water outlet of two level clarifying basin, the dope outlet of the NF membrane concentrating and separating device and institute State the connection of second medicament dispenser.
Compared with prior art, the utility model divides salt device that pretreated dense salt waste water progress is dense by concentration Contracting, after concentration by second order reaction mechanism add medicament reacted, flocculation sediment, filtering, it can be removed in dense salt waste water The impurity such as suspended matter, heavy metal, Ca, Mg and Fe, part COD, and film is carried out by NF membrane concentrating and separating device and divides salt treatment so that High concentration sodium chloride solution is collected in dope pond, it crystallizes to form pure salt in favor of recycling easy to subsequent evaporation, and receives Filter membrane concentrating and separating device separate the dense salt to be formed it is reflowable to three header of level-one as softening agent, which obviate dense salt processing and The injected volume of softening agent is reduced, reduces operating cost.
Brief description of the drawings
Fig. 1 is the attachment structure schematic diagram of point salt treatment system of the dense salt waste water of the utility model.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining The utility model, is not used to limit the utility model.
As shown in Figure 1, the utility model provides a kind of point salt treatment system of dense salt waste water, including pretreatment unit 1, Concentration divides salt device 2 and evaporated crystallization device 3.
Pretreatment unit 1 includes sedimentation basin 11, is built in the aeration mechanism 12 of 11 bottom of sedimentation basin, goes out arranged on sedimentation basin 11 The filler filter layer 13 of water end (W.E.) and the first ultrafilter 14 being connected with the water outlet of sedimentation basin 11, it can be right by being aerated mechanism 12 Into in sedimentation basin 11 dense salt waste water carry out Air Exposure, by dense salt give up water part COD carry out oxidation processes, pass through at the same time Part solid impurity can be removed by crossing precipitation, and 13 and first ultrafilter 14 of filler filter layer can by the suspended matter in dense salt waste water, The contaminant filters such as colloidal silicon, part COD remove.
Concentration divides salt device 2 to include secondary concentration mechanism 21, second order reaction mechanism 22 and Fen Yan mechanisms 23;Secondary concentration machine Structure 21 includes first-stage reverse osmosis film filter 211, the level-one concentrated water with the concentrated water outlet connection of first-stage reverse osmosis film filter 211 Pond 212, the water outlet for adjusting the 6th medicament delivery device 213 of pH value in level-one concentrated water pond 212 and level-one concentrated water pond 212 Second ultrafilter 214 of connection, the two-pass reverse osmosis film filter 215 and and two-pass reverse osmosis being connected with the second ultrafilter 214 The two level concentrated water pond 216 of the concentrated water outlet connection of film filter 215.The water inlet end of first-stage reverse osmosis film filter 211 and first The water outlet connection of ultrafilter 14, it can be concentrated the dense salt waste water after ultrafiltration, and the clear water then recoverable formed, Specially the water yield of first-stage reverse osmosis film filter 211 is the 30% of its inflow, the TDS of the dense salt of its concentrated water outlet discharge Value is increased to 5000-8000mg/L by 2000mg/L, and the dense salt waste water after primary concentration enters level-one concentrated water pond 212, and one The dense salt waste water in level concentrated water pond 212 can launch acid by the 6th medicament delivery device 213, and the dense salt in level-one concentrated water pond 212 is given up The pH value of water is adjusted to 6.0~6.5, and the dense salt waste water after adjusting after pH value can be filtered by the second ultrafilter 214, the second ultrafiltration Device 214 can use polysulfone hollow fiber ultrafiltration membrane system;Enter two-pass reverse osmosis film filter 215 after the filtering of second ultrafilter 214, two Level reverse osmosis membrane filt 215 can use WRO membrane reverse osmosis, it can realize low pressure equipment with high desalinization, be specially two-pass reverse osmosis film The concentrated water that filter 215 is discharged is the 30% of inflow, it may be such that the TDS into the dense salt waste water in two level concentrated water pond 216 Value is increased to 15000-24000mg/L.
Second order reaction mechanism 22 includes sequentially connected three header 221 of level-one, level-one clarifying basin 222, three header 223 of two level And two level clarifying basin 224;Three header 221 of level-one include three header body 221a of level-one and respectively with three header body of level-one The first medicament delivery device 221b, second medicament dispenser 221c and the 3rd medicament delivery device that three babinets of 221a are equipped with 221d, three header body 221a of level-one are connected with two level concentrated water pond 216, the first medicament delivery device 221b, second medicament dispenser 221c and the 3rd medicament delivery device 221d are set gradually along water (flow) direction, and the first medicament delivery device 221b is mainly used for launching stone Grey breast, second medicament dispenser 221c mainly launch organic sulfur, and the 3rd medicament delivery device 221d then launch sodium sulphate medicament and PFS flocculants and PAM flocculants, the medicament of input can fully react under stirring with dense salt waste water, the mixing after reaction Liquid, which enters in level-one clarifying basin 222, to be precipitated, and oettIed sewage enters three header 223 of two level, and precipitating sludge is then by one 222 bottom of level clarifying basin discharges and sludge is formed after being dehydrated by centrifugal dehydrator 225, and sludge can be sent outside by trolley with municipal dirty Mud is handled together;Three header 223 of two level includes three header body 223a of two level and be connected with three header body 223a of two level the Four medicament delivery device 223b and the 5th medicament delivery device 223c, three header body 223a of two level are connected with level-one clarifying basin 222, and one OettIed sewage can be to two level three into two level three header body 223a, the 4th medicament delivery device 223b in level clarifying basin 222 Input sodium carbonate liquor in header body 223a, and the 5th medicament delivery device 223c then puts into flocculant and flocculation aid, input Medicament is fully reacted and entered in two level clarifying basin 224 with sewage under stirring to be precipitated, the sludge and level-one of precipitation The sludge of clarifying basin 222 can use identical processing mode, and oettIed sewage then enters water tank 226, in water tank 226 Treated dense salt waste water is passed through in storage, it can be used for being delivered to Fen Yan mechanisms 23.
By above-mentioned second order reaction mechanism 22 add the abundant reaction treatment of medicament after, in dense salt waste water mainly contain sodium from Son, chlorion, sulfate ion and a small amount of calcium ions and magnesium ions, COD molecules.The present embodiment Fen Yan mechanisms 23 include sequentially connected More medium filter 231, NF membrane concentrating and separating device 232, nanofiltration waste liquid pool 233, three-level reverse osmosis membrane filt 234 and dope Pond 235;The water inlet end of more medium filter 231 is connected with water tank 226, it can be interior to water tank 226 after above-mentioned reaction Dense salt waste water carry out filtration treatment, the dense salt waste water after filtering enters NF membrane concentrating and separating device 232, the sodium in dense salt waste water Ion, chlorion and most of moisture both pass through NF membrane concentrating and separating device 232 and enter in nanofiltration waste liquid pool 233, and wherein Divalent salts be then retained down by the NF membrane of NF membrane concentrating and separating device 232, its cause do not pass through NF membrane dense salt in shape Into the dense salt using sodium sulphate as major solute, that is, form metabisulfite solution, therefore the NF membrane concentrating and separating device 232 of the present embodiment Dope outlet is connected with second medicament dispenser 221c, it can be back to the using the dense salt for mainly containing sodium sulphate as softening agent Two medicament delivery device 221c, it can reduce the injected volume of sodium sulphate in the 3rd medicament delivery device 221d, can also substantially reduce the 4th The injected volume of sodium carbonate, it also avoid the processing of metabisulfite solution to be formed in medicament delivery device 223b, it can reduce system fortune Capable reagent cost and the processing cost of waste liquid, while it also may be such that the predominantly sodium chloride collected in nanofiltration waste liquid pool 233 Solution, it is conducive to be subsequently formed pure salt, improves resource utilization rate, and be practically free of in sodium chloride solution divalent salts and COD, dirt and organic contamination are produced when avoiding subsequent evaporation crystallization.
The TDS values that sodium chloride solution is formed after the filtering of NF membrane concentrating and separating device 232 are generally a 22000mg/L left sides The right side, the present embodiment carry out reverse-osmosis treated, three-level reverse osmosis membrane mistake by three-level reverse osmosis membrane filt 234 to sodium chloride solution Filter 234 preferably uses STRO reverse osmosis membranes, it is the high-throughout reverse osmosis membrane of high pressure, it may be such that into dope pond 235 The TDS values of dense salt be increased to 60000mg/L, it can form ultrahigh concentration sodium chloride solution.
The present embodiment evaporated crystallization device 3 includes feed pump 31, pre- heat exchanger 32, circulation heat exchanger 33, flash tank 34, pressure Contracting machine 35, circulating pump 36, triple valve 37 and whizzer 38;The pre- heat exchanger 32 has the first heat exchanging chamber and the second heat exchange Chamber, the circulation heat exchanger 33 have the first heat exchanger tube 331 and the second heat exchanger tube 332;The water inlet end of the feed pump 31 with it is dense Liquid pool 235 connects, water outlet is connected with the first heat exchanging chamber, the water outlet of the first heat exchanging chamber and the water inlet end of the first heat exchanger tube 331 Connection, the water outlet of the first heat exchanger tube 331 are connected with flash tank 34, and 34 top of flash tank is changed by compressor 35 and second The water inlet end connection of heat pipe 332, the water outlet of the second heat exchanger tube 332 is connected with the second heat exchanging chamber, 34 bottom of flash tank and The water inlet end connection of circulating pump 36, the water outlet of circulating pump 36 are divided with the first heat exchanger tube 331 and centrifugation respectively by triple valve 37 Connected from device 38.High concentration sodium chloride solution collect enter dope pond 235 after, after high salt water quality average by feed pump 31 convey into Enter pre- heat exchanger 32, pre- heat exchanger 32 can use notification number as shell and tube disclosed in the utility model patent of 204214315 U of CN Heat exchanger, multiple tubulations of the tubular heat exchanger are interior to form the first heat exchanging chamber, and the cavity between multiple tubulations changes for second Hot chamber, the interior sodium chloride solution for low temperature of the first heat exchanging chamber of pre- heat exchanger 32, the second heat exchanging chamber are interior for high-temperature heating liquid, this reality Applying example will be preheated by feed pump 31 in sodium chloride solution the first heat exchanging chamber of input, subsequently into circulation heat exchanger 33 First heat exchanger tube 331, circulation heat exchanger 33 can use three-way guidance tape typed heat exchanger, it exchanges heat with the first heat exchanger tube 331, second 332 and the 3rd heat exchanger tube 333 of pipe, the 3rd heat exchanger tube 333 can be passed through high-temperature steam in order to the chlorination in the first heat exchanger tube 331 Sodium solution reheating, the sodium chloride solution after reheating are evaporated crystallization into flash tank 34, are formed in flash tank 34 Steam can enter compressor 35, enter the second heat exchanger tube 332 after the compression heating of compressor 35, it can be to the first heat exchanger tube Sodium chloride solution in 331 is heated, while the condensed water of the second heat exchanger tube 332 discharge still has higher temperature, therefore The water outlet of second heat exchanger tube 332 is connected with the water inlet end of the second heat exchanging chamber, it can be by the condensed water of high temperature to sodium chloride solution Preheated, its maximizing improves the utilization rate of heat;And passing through the concentrate that evaporative crystallization formation evaporation is formed can lead to Cross circulating pump 36 and deliver into triple valve 37, when the concentration of concentrate is less than setting value, triple valve 37 turn on circulating pump 36 with First heat exchanger tube 331, concentrate is delivered into the first heat exchanger tube 331 and carries out circulating-heating by circulating pump 36, and is again introduced into Evaporative crystallization in flash tank 34, when the concentration of concentrate is more than setting value, triple valve 37 turns on circulating pump 36 with centrifuging Device 38, it can be transported to whizzer 38 by circulating pump 36, and whizzer 38 has a thickener 381, enter The concentrate of whizzer 38 initially enters thickener 381, and it is further that it can be conducive to be condensed into the sodium chloride solution of magma shape Crystallization, it is after 38 centrifugal dehydration of whizzer, and then vibrated fluidized bed 39 is dried to form purity >=98.5% Level-one refining industrial salt.
The process flow for dividing salt treatment system of the dense salt waste water of the present embodiment is as follows:It is right by pretreatment unit 1 first Dense salt waste water is pre-processed, it can remove solid in dense salt waste water, suspended contamination etc., then pass through secondary concentration mechanism 21 are concentrated to improve the TDS values of dense salt waste water, and the dense salt waste water after concentration is added chemical agent so that it is fully reacted And the calcium ions and magnesium ions in waste water, a small amount of COD are removed, the waste water after reaction is subjected to nanofiltration by NF membrane concentrating and separating device 232 Processing, it may be such that monovalent ion by order to form sodium chloride solution, and the waste water after nanofiltration then forms metabisulfite solution, Its is reflowable high-purity the sodium chloride solution of the input amount of its chemical agent, formation can be formed by evaporative crystallization as medicament Spend sodium chloride.
Specific embodiment of the present utility model described above, does not form the restriction to scope of protection of the utility model. The various other corresponding changes and deformation that any technical concept according to the present utility model is made, should be included in this practicality In new scope of the claims.

Claims (6)

1. a kind of dense salt waste water divides salt treatment system, it is characterised in that divides salt device and evaporation including pretreatment unit, concentration Crystallization apparatus;The concentration divides salt device to include:
Secondary concentration mechanism, its water inlet end are connected with the pretreatment unit and are used to carry out pretreated dense salt waste water dense Contracting;
Second order reaction mechanism, it includes sequentially connected three header of level-one, level-one clarifying basin, three header of two level and two level clarification Pond;Three header of level-one includes three header body of level-one and is respectively equipped with three babinets of three header body of level-one First medicament delivery device, second medicament dispenser and the 3rd medicament delivery device;Three header of two level includes three header sheet of two level Body and the 4th medicament delivery device and the 5th medicament delivery device being connected with three header body of two level;
Fen Yan mechanisms, it includes sequentially connected more medium filter, NF membrane concentrating and separating device and dope pond;The multimedium The water inlet end of filter is connected with the water outlet of two level clarifying basin, the dope of NF membrane concentrating and separating device outlet and described the Two medicament delivery devices connect.
2. dense salt waste water according to claim 1 divides salt treatment system, it is characterised in that secondary concentration mechanism bag Include first-stage reverse osmosis film filter, with the level-one concentrated water pond of the concentrated water of first-stage reverse osmosis film filter outlet connection, for adjusting 6th medicament delivery device of pH value, the second ultrafilter being connected with the water outlet in level-one concentrated water pond and second in level-one concentrated water pond The two-pass reverse osmosis film filter of ultrafilter connection and the two level concentrated water with the concentrated water outlet connection of two-pass reverse osmosis film filter Pond;Wherein, the two level concentrated water pond is connected with three header body of level-one.
3. dense salt waste water according to claim 2 divides salt treatment system, it is characterised in that the Fen Yan mechanisms further include Three-level reverse osmosis membrane filt and nanofiltration waste liquid pool, the nanofiltration waste liquid pool is connected with the NF membrane concentrating and separating device, described Three-level reverse osmosis membrane filt one end is connected with nanofiltration waste liquid pool, the other end and dope pond.
4. dense salt waste water according to claim 3 divides salt treatment system, it is characterised in that the evaporated crystallization device bag Include feed pump, pre- heat exchanger, circulation heat exchanger, flash tank, compressor, circulating pump, triple valve and whizzer;It is described pre- to change Hot utensil has the first heat exchanging chamber and the second heat exchanging chamber, and the circulation heat exchanger has the first heat exchanger tube and the second heat exchanger tube;It is described The water inlet end of feed pump is connected with dope pond, water outlet is connected with the first heat exchanging chamber, and the water outlet of the first heat exchanging chamber is changed with first The water inlet end connection of heat pipe, the water outlet of the first heat exchanger tube is connected with flash tank, and the upper end that flashes passes through compressor and the The water inlet end connection of two heat exchanger tubes, the water outlet of the second heat exchanger tube are connected with the second heat exchanging chamber, the flash tank bottom and circulation The water inlet end connection of pump, the water outlet of circulating pump is connected with the first heat exchanger tube and whizzer respectively by triple valve.
5. dense salt waste water according to claim 4 divides salt treatment system, it is characterised in that the evaporated crystallization device is also Including the vibrated fluidized bed being connected with whizzer.
6. dense salt waste water according to claim 5 divides salt treatment system, it is characterised in that the pretreatment unit includes One sedimentation basin, the aeration mechanism for being built in sedimentation basin bottom, the filler filter layer arranged on sedimentation basin water outlet and with sedimentation basin First ultrafilter of water outlet connection.
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CN110590041A (en) * 2019-09-30 2019-12-20 大唐郓城发电有限公司 Method for treating desulfurization wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110590041A (en) * 2019-09-30 2019-12-20 大唐郓城发电有限公司 Method for treating desulfurization wastewater

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