CN209555002U - High-salt wastewater processing system - Google Patents

Abstract

The utility model discloses a kind of high-salt wastewater processing systems, belong to technical field of sewage, high-salt wastewater enters MVR evaporator after running through heat exchange equipment, the secondary steam of MVR evaporator is connected through vapour compression machine with heat exchanger, saturated salt mother liquor enters cyclone separator, and the centrifugate of cyclone separator is recycled to MVR evaporator, thickening salting liquid sequentially enters magma tank and centrifuge；The part saliferous mother liquor reflux of centrifuge is recycled to outside MVR evaporator, part saliferous mother liquor through heat pump and heat exchanger to be drained into scrapper thin film evaporator and is evaporated, and scrapper thin film evaporator steam, which carries organic matter and enters sewage plant after waste heat recycling condensation, to be handled.The utility model utilizes the combination of MVR evaporator and scrapper thin film evaporator, solve the problems, such as that high boiling point organic compound enrichment leads to the reduction of solid salt quality, entire evaporative desalination process is operated continuously, solid salt quality is improved, the desalting processing of every profession and trade high-salt wastewater can be widely applied to.

Description

High-salt wastewater processing system

Technical field

The utility model belongs to technical field of sewage more particularly to a kind of high-salt wastewater processing system.

Background technique

Currently, numerous chemical companies can generate a large amount of wastewater from chemical industry in process of production, a portion saliferous is higher Wastewater treatment difficulty is larger, such as since saliferous is higher in dyestuff, pesticide, medicine intermediate waste water, seriously polluted, it is necessary to desalination Processing could discharge.Moreover such waste component is complicated, does not have recovery value, using either physically or chemically higher cost, Therefore biological treatment is still preferred method.

It is that 0.8% or so and less salt waste water below, part are micro- that conventional biological treatment process waste water, which is generally salinity, Biology after taming can tolerate salinity be 1%-2% waste water, but be not amenable to variation water quality impact, and run it is bad when need to throw Facultative Halophiles are added to increase ton cost of water treatment, stable water outlet is difficult to ensure, and chemical production wastewater salinity is generally 5% or more To between 20%.Therefore, the biological treatment needs of high slat-containing wastewater are diluted, and usually (salinity is less than under low salt concn 1%) it runs, causes the waste of water resource, treatment facility is huge, investment increases, and operating cost improves.It needs to carry out waste water thus Desalting processing derives various ways for waste water desalination: steamer, multiple-effect evaporation, single effect evaporation and MVR mechanical steam are pressed again The technologies such as contracting are to carry out physics desalination, area in such a way that heating evaporation water carries out the final abjection inorganic salts of material concentration It is not that its energy consumption, efficiency, equipment investment are different.

Enrichment high boiling point organic compound saliferous mother liquor is generated during evaporative desalination, due to the high evaporation capacity of partial organic substances boiling point It is small and be enriched in mother liquor, and it is final be enriched with to a certain degree after due to commonly evaporate high boiling point organic compound cannot be steamed be mixed into it is solid In body salt, to influence the quality, color and purity that finally evaporate salt, it is mixed into the solid salt of high boiling point organic compound or even becomes Dangerous waste need to entrust dangerous waste relevant unit to be disposed, and increase dangerous waste related management, storage, transport, labour, account etc. at This consumption greatly increases entreprise cost.

Utility model content

The purpose of the utility model is to provide a kind of high-salt wastewater processing systems, it is intended to solve above-mentioned with high salt in the prior art Enrichment high boiling point organic compound saliferous mother liquor is generated during waste water evaporative desalination, influences the quality, the face that finally evaporate solid salt Color and purity, the solid salt for being mixed into high boiling point organic compound can become the technical issues of dangerous waste increases cost of disposal.

In order to solve the above technical problems, technical solution adopted in the utility model is:

A kind of high-salt wastewater processing system, including high-salt wastewater water inlet pipe, the high-salt wastewater water inlet pipe, which sequentially passes through, to be changed It is connected after hot equipment with MVR evaporator, the secondary steam of the MVR evaporator is connected to vapour compression machine, the MVR evaporator Saturated salt mother liquor enters cyclone separator, and the separating liquid of the cyclone separator is connected to through return pipe with MVR evaporator, the rotation The thickening salting liquid of stream separator enters magma tank, and the magma tank is connected with centrifuge, and the centrifuge isolates solid salt With saliferous mother liquor；The saliferous mother liquor is shunted by reflux branch and outlet branch, and the reflux branch is connected with heat pump, By heat pump by a part of saliferous Recycling Mother Solution to MVR evaporator；The outlet branch is connected with scrapper thin film evaporator, passes through Outlet branch dries another part saliferous mother liquor scrapper thin film evaporator for solid salt, and remaining condensate liquid enters sewage plant.

Preferably, the saliferous concentrate of the MVR evaporator is recycled to MVR evaporation through heat exchanger after branch pipe, heat pump The secondary steam of device, the MVR evaporator enters heat exchanger and the heat exchange of saliferous concentrate through vapour compression machine, after cooling condensation Secondary steam enter condensate drum.

Preferably, water inlet heat exchange in heat exchange equipment one of the condensate liquid and high-salt wastewater of the condensate drum, through heat Condensed water after exchange cooling is delivered to sewage plant by the road.

Preferably, the not condensing of the condensate drum is through vacuum pump extraction and the water inlet of high-salt wastewater in heat exchange equipment two Heat exchange, condensed water of the not condensing of the condensate drum after heat exchange cools down are delivered to sewage plant, the condensation by the road Condensed water enters sewage plant, fixed gas and enters exhaust treatment system by pipeline after heat exchange in the not condensing of flow container.

Preferably, the vapour compression machine is Roots Compressor or centrifugal compressor.

Preferably, blender is equipped in the magma tank.

Preferably, the sewage plant include the conditioning tank being sequentially communicated, Anaerobic Sequencing Bath Reactor, anaerobic pond, anoxic pond, Aerobic tank, secondary settling tank are connected to UASB reactor, and the mixed liquor of the anoxic pond is back to anaerobic pond, the mixing of the aerobic tank Liquid is back to anoxic pond, the activity sludge reflux of the secondary settling tank to anoxic pond.

Preferably, the boosted pond of the supernatant of the secondary settling tank and delivery pump are delivered to UASB reactor.

The beneficial effects of adopting the technical scheme are that compared with prior art, the utility model is by changing Hot equipment enters MVR evaporator, recompression of the MVR evaporator secondary steam through vapour compression machine after preheating to high-salt wastewater Technology provides heat source for heat exchanger, saves a large amount of steam sources, saves operating cost, and the saturated salt mother liquor after being centrifuged desalination is through revolving Stream separator thickening, thickening salting liquid is again successively by the separation of magma tank and centrifuge；The part saliferous mother liquor of centrifuge returns It flows through heat pump and heat exchanger is recycled to MVR evaporator, fractional saturation salt mother liquor outlet enters scrapper thin film evaporator and is evaporated Processing avoids the negative effect of organic matter enrichment bring (evaporation capacity reduces, energy consumption increases, goes out salt quality), scraper plate thin film evaporation Device steam carries organic matter and enters the progress sewage treatment of plant area's sewage plant after waste heat recycling condensation.The utility model utilizes MVR The combination of evaporator and scrapper thin film evaporator solves high boiling point organic compound enrichment and causes asking for solid salt quality reduction Topic operates continuously entire evaporative desalination process, improves solid salt quality, can be widely applied to the desalination of every profession and trade high-salt wastewater Processing.

Detailed description of the invention

Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.

Fig. 1 is a kind of process flow chart for the treatment of method for high-salinity wastewater provided by the utility model；

Fig. 2 is the waste water processes figure of sewage plant in Fig. 1.

Specific embodiment

Below with reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear Chu is fully described by, it is clear that and described embodiment is only a part of the embodiment of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Currently, high-salt wastewater processing mostly uses MVR evaporator, generally applied 20-40 times by Recycling Mother Solution, due to high boiling Point organic matter evaporation capacity is less and is enriched with, and the enrichment of high boiling point organic compound causes solution elevation of boiling point evaporation capacity to decline, high boiling Select organic matter enrichment evaporate afterwards to a certain extent the salt of abjection due to impurity high boiling point organic compound is excessive and it is faint yellow to show or Yellow influences the quality, appearance and purity of salt, and the standard for no longer meeting Nacl cannot be sold outside, or even need to entrust as dangerous waste Dangerous waste qualification unit is disposed, and greatly increases business processes cost.The above problem, this reality are able to solve using the utility model Process flow with the high-salt wastewater processing system of novel offer is as shown in Figure 1.

A kind of high-salt wastewater processing system as shown in Figure 1, including high-salt wastewater water inlet pipe, the high-salt wastewater water inlet pipe It is connected after sequentially passing through heat exchange equipment with MVR evaporator, the secondary steam of the MVR evaporator is connected to vapour compression machine, described The concentrate of MVR evaporator enters cyclone separator, and the separating liquid of the cyclone separator connects through return pipe and MVR evaporator Logical, the thickening salting liquid of the cyclone separator enters magma tank, and being stirred continuously in magma tank equipped with blender prevents crystallization from hanging Wall；The magma tank is connected with centrifuge, and the centrifuge isolates solid salt and saliferous mother liquor；The saliferous mother liquor passes through back Stream branch and outlet branch are shunted, and the reflux branch is connected with heat pump, by heat pump by a part of saliferous Recycling Mother Solution To MVR evaporator；The outlet branch is connected with scrapper thin film evaporator, is scraped another part saliferous mother liquor by outlet branch Dry plate thin film evaporator is solid salt, and remaining condensate liquid enters sewage plant.Wherein, the outlet part saliferous of outlet branch is female Liquid accounts for about 5% of total amount or so.

In order to realize that Recycling Mother Solution is applied, the saliferous concentrate of the MVR evaporator runs through heat exchanger after branch pipe, heat pump It is recycled to MVR evaporator, the secondary steam of the MVR evaporator enters heat exchanger through vapour compression machine and saliferous concentrate heat is handed over It changes, the condensed secondary steam that cools down enters condensate drum.

In order to make full use of the waste heat of condensate liquid, the water inlet of the condensate liquid and high-salt wastewater of the condensate drum is set in heat exchange Heat exchange in standby one, the condensed water after heat exchange cools down are delivered to sewage plant by the road.

Meanwhile the not condensing of the condensate drum is warm in heat exchange equipment two through vacuum pump extraction and the water inlet of high-salt wastewater Exchange, condensed water of the not condensing of the condensate drum after heat exchange cools down are delivered to sewage plant, the condensate liquid by the road Condensed water enters sewage plant, fixed gas and enters exhaust treatment system by pipeline after heat exchange in the not condensing of tank, at tail gas Qualified discharge after reason.

Wherein, the vapour compression machine is Roots Compressor or centrifugal compressor, with specific reference to the place of high-salt wastewater Reason amount is selected.

In a specific embodiment of the utility model, as shown in Fig. 2, the sewage plant includes the adjusting being sequentially communicated Pond, Anaerobic Sequencing Bath Reactor, anaerobic pond, anoxic pond, aerobic tank, secondary settling tank are connected to UASB reactor, the anoxic pond Mixed liquor is back to anaerobic pond, and the mixed liquor of the aerobic tank is back to anoxic pond, and the activity sludge reflux of the secondary settling tank is extremely Anoxic pond.Wherein, the boosted pond of the supernatant of the secondary settling tank and delivery pump are delivered to UASB reactor.

Above-mentioned high-salt wastewater processing system mainly comprises the steps that

A, high-salt wastewater preheats: the high-salt wastewater that salinity is 5%-20% being intake and is preheating to 50-80 DEG C by room temperature；It is with high salt The preferred mono-salt waste water of waste water (containing only a kind of inorganic salts ingredients), if containing plurality of inorganic salt salty separation should be carried out by increasing equipment With purification, otherwise need to be disposed by dangerous waste.

B, evaporation separation: the high-salt wastewater after pre-heating temperature elevation enters MVR evaporator and is evaporated concentration, at the beginning of MVR evaporator Steam pressure needed for phase starts is 0.2-0.3MPa, and temperature is 110-130 DEG C, and the evaporation temperature of high-salt wastewater is arranged in operational process Degree is 60-98 DEG C；

In evaporating concentration process, moisture and low-boiling-point organic compound are steamed with steam, are formed secondary steam and are entered vapour pressure The compression heating of contracting machine, secondary steam institute's band heat is MVR evaporator heat pump circulation fluid heating supplement through heat exchanger heat exchange after heating Separation chamber's heat maintains solution evaporating temperature in evaporation separation chamber, is not required to supplement steam or supplement trace steam；Secondary steam warp Enter condensate drum after entering heat exchanger heat exchange condensation after vapour compression machine compression heating；The saliferous concentrate of MVR evaporator passes through Branch pipe distributes a part and is recycled to MVR evaporator by heat pump and heat exchanger.Wherein, MVR evaporator by falling film evaporator and/ Or forced-circulation evaporator is composed, and selects evaporator type according to material characteristic, material characteristic includes fouling wall built-up, evaporation Temperature and material concentration etc..

High-salt wastewater material is concentrated in MVR evaporator, and concentration increases, and moisture and low-boiling-point organic compound are with steamed Out, cyclone separator being entered after material salt concentration reaches saturation state to be thickened, centrifugate is back to vapor seperator, High level salt solution after thickening enters magma tank, and being stirred continuously in magma tank equipped with blender prevents crystallization wall built-up, recycles centrifugation The solid salt that machine isolates moisture content≤4% is packed and stored；The saliferous mother liquor isolated enters step C and is further processed.

High-salt wastewater preferred concentration is the brine waste of 10%-20%, and the brine waste that salinity is 5%-10% is increase Desalination operation continuity and reduction energy consumption, can increase enriched chamber before the evaporation separation chamber of MVR evaporator, can be falling film evaporation Room, climbing-film evaporation room, circulating and evaporating room etc. are concentrated, and determine type with specific reference to the type and experiment lab scale of waste water and salt.

Condensate liquid into condensate drum is pumped into heat exchange equipment one by delivery pump, in heat exchange equipment one and high-salt wastewater Water inlet carry out heat exchange, play the role of preheating high-salt wastewater, recycling condensing water after heat exchange or enter sewage plant and handle.

The not condensing of the condensate drum is carried out using the water inlet that vacuum pump is drawn through heat exchange equipment two and high-salt wastewater Heat exchange is played the role of preheating high-salt wastewater, and the recycling condensing water or entrance sewage plant after heat exchange are handled, after heat exchange Remaining fixed gas enters exhaust treatment system.

Wherein, heat exchange equipment one and heat exchange equipment two select plate heat exchanger；Heat exchanger selects pipe heat exchanger.

C, saliferous mother liquid disposal: centrifuge is centrifuged the solution after desalination and forms saliferous mother liquor, and saliferous mother liquor is through outlet branch Outlet a part, remaining saliferous mother liquor, which is back to MVR evaporator through reflux branch, to be continued to apply；Outlet mother liquor amount accounts for saliferous mother liquor 3%-8%, outlet mother liquor continue to evaporate using scrapper thin film evaporator, are concentrated to get solid salt；Scrapper thin film evaporator steams Vapour, which carries organic matter and recycles to form condensate liquid and enter back into sewage plant through waste heat, to be handled；

The waste heat of the condensate liquid of MVR evaporator secondary steam and fixed gas, scrapper thin film evaporator condensation fluid residual heat return Receipts preheat the water inlet of high-salt wastewater, since secondary steam condensate liquid accounting is larger and secondary steam condensate temperature 85- 95 DEG C, so secondary steam condensate liquid plays main heat exchange thermogenic action, high-salt wastewater is intake, 50-80 is preheating to by room temperature DEG C, plate heat exchanger is all made of for the heat exchange equipment two of fixed gas preheating and the heat exchange equipment one for condensed water preheating；Two Secondary steam is carried out after compression heating by the steam that the saliferous mother liquor and MVR evaporator of pipe heat exchanger and reflux are diverted Heat exchange.

The vapour compression machine is preferably Roots Compressor or centrifugal compressor, when treating capacity less than 5 tons/constantly adopt With Roots Compressor, centrifugal compressor is otherwise selected.

Scrapper thin film evaporator hull outside is internal that rotatable scraper plate is housed equipped with heating steam jacket, scraper plate by The rotary shaft of cylinder center drives.After outlet mother liquor is tangentially added by evaporator top, in the drive of gravity and rotor segment Under, the film of backspin is formed along the inner wall of shell, by control inlet amount and live steam additional amount, outlet mother liquor can be steamed It is dry, solid product salt is directly obtained in bottom, secondary steam is then discharged after demister by top.Scrapper thin film evaporator is dashed forward Advantage is very strong to the adaptability of material out, and thermal resistance influences small, and heat transfer coefficient is big, to high viscosity, easily crystallization, easy fouling, high boiling Point, high viscosity or the product easily crystallized (loose state particle) containing suspended matter or have the evaporation of thermal sensitivity feed liquid concurrently and are applicable in.Due to Material is constantly spread to film by the movement of scraper plate on evaporating surface, to achieve the effect that thin film evaporation；Steam is common heat Medium can reduce the boiling point of material, enhance the effect of evaporation, can directly obtain solid product.Utilize scraper plate film High boiling point organic compound in outlet mother liquor can further be evaporated by evaporator, grasp entire evaporative desalination process continuously Make, improve out the quality of solid salt, solves the problems, such as that high boiling point organic compound enrichment causes the reduction of solid salt quality, it can be wide Model is applied to the desalting processing of every profession and trade high-salt wastewater, and sewage plant processing is entered after evaporation condensate and fixed gas UTILIZATION OF VESIDUAL HEAT IN and is set It applies, avoids pollution environment.

It is preferably exactly scheme as shown in Fig. 2, the sewage plant includes the conditioning tank being sequentially communicated, anaerobic as one kind Formula reactor, anaerobic pond, anoxic pond, aerobic tank, secondary settling tank are connected to UASB reactor, and the mixed liquor of the anoxic pond is back to Anaerobic pond, the mixed liquor of the aerobic tank are back to anoxic pond, the activity sludge reflux of the secondary settling tank to anoxic pond.Wherein, The boosted pond of the supernatant of the secondary settling tank and delivery pump are delivered to UASB reactor, the row up to standard after UASB reactor for treatment It puts.

Enter sewage plant using the condensate wastewater after above-mentioned treatment method for high-salinity wastewater evaporative desalination to handle.The master of waste water Wanting source is MVR evaporator evaporation condensate waste water and scrapper thin film evaporator evaporative condenser waste water and sanitary sewage and vehicle Between alkalinity after nitrogen oxides tail gas absorption containing nitrate absorb waste water, since condensate temperature is at 70 ~ 80 DEG C, mix other useless Water natural cooling enters biochemical treatment system after being cooled to 30 DEG C ~ 35 DEG C, and temperature fall time just combines anaerobic sequencing batch to react The not flooding time of device, sewage quality after whole mixing are as follows: CODcr value 10000mg/L or so, 200 ~ 300mg/L of ammonia nitrogen and Part organic nitrogen, 6000 ~ 8000mg/L of nitrate, through system shown in Fig. 2 processing after UCT Process for Effluent CODcr300 ~ 500mg/L, 30 ~ 60mg/L of ammonia nitrogen are lifted into UASB reactor and carry out biodegrade and denitrogenation, and UASB is anti-under normal temperature state It answers device to be discharged CODcr < 150mg/L 10 ~ 20mg/L of ammonia nitrogen, meets integrated wastewater discharge standard stabilization and meet comprehensive row's secondary standard, Dissolved oxygen gradient is successively decreased between aerobic tank control 0.7 ~ 1.8mg/L of dissolved oxygen, and end dissolved oxygen is minimum, and return sludge ratio 50% ~ 100% is good Oxygen return current ratio of the mixed liquid 150% ~ 250%, anoxic return current ratio of the mixed liquid 50% ~ 100%.

Anaerobic Sequencing Bath Reactor (Anaerobic Sequencing BatchReactor abbreviation ASBR) is the U.S. Dague teaches a kind of high-rate anaerobic reactor developed in early 1990s.ASBR is the unstable state anaerobism of intermittent duty Bioreactor, each cycle of operation were divided into water, reaction, precipitating, draining, standby 5 stages.ASBR anaerobism is compared to other Anaerobic technique has the advantage that

A. simple process integrates water inlet reaction sedimentation and drawing, and three phase separator is no longer the core of this technique, is not required to Additional clarifying basin and sedimentation basin, no sludge reflux.

B. the stage of reaction can keep higher upflow velocity 1-5m/h without considering that flow velocity crosses mud of hurrying up due to not being discharged The generation of phenomenon, contributes to form granule sludge.

C. batch mode of operation, strong shock resistance, other anaerobic techniques are since continuum micromeehanics are discharged while must be equipped with Otherwise water outlet band mud is caused sludge concentration to reduce by optimal three phase separator, and water quality and quantity changes three-phase separate when fluctuating huge Will deviate from former design size from the Angular Dimension of device, be likely to result in collecting methane be not thorough, sludge retention it is ineffective.

D. adaptable, it is thoroughly mixed mode, sludge concentration is high, adapts to impact load and high concentrated organic wastewater.

E. flexible operation is run, it can be according to the variation of waste water water, water quality, by adjusting each work in a cycle of operation Runing time and HRT, SRT of sequence and the requirement for meeting effluent quality have very strong operating flexibility.

F. good effect of separating solid from liquid, out clarification of water.It is separated by solid-liquid separation and is carried out in inside reactor, be that ASBR technique is different from it One notable feature of his anaerobic technique.Firstly, the flocculation of anaerobic organism group is similar with the mode of aerobic activated sludge process, it is by thin Bacterium causes the Finite Concentration of matrix, and F/M value has a major impact it.Low F/M value is conducive to bioflocculation, and sedimentation is fast, water outlet Suspended solid is low.When the anaerobic reactor steady state operation that one continuous feed is thoroughly mixed, F/M is certain value, and intermittently operated ASBR reactor water inlet after be high F/M, with the progress of reaction, F/M is gradually decreased, reaction terminate draining when, F/M is minimum, And gas production is minimum, the interference for the upflow velocity for being easy to be separated by solid-liquid separation, and not intaking, pure gravitational settling.Therefore, from solid-liquid point Say that the batch mode of operation of ASBR method is better than the continuous operation mode of other anaerobic process from maintenance high concentration sludge effect.

Anaerobic pond, anoxic pond, aerobic tank and the UCT technique for promoting pond composition, UCT technique (University of in Fig. 2 It Capetown) is a kind of denitrification dephosphorization technique of the Cape Town, RSA university exploitation similar to A2/O technique.UCT technique and A2/O work Skill can be prevented due to nitrate in this way the difference is that clarifier sludge flows back into anoxic pond rather than flows back into anaerobic pond Nitrogen enters anaerobic pond, destroys the anaerobic state of anaerobic pond and influences the dephosphorizing rate of system, increases from anoxic pond to anaerobic pond Mixed liquor flows back, and more dissolubility BOD is contained in the mixed liquor to flow back from anoxic pond to anaerobic pond, and nitrate is seldom, subtracts Few dissolved oxygen and entering for nitrate build good anaerobic environment, are provided by the hydrolysis of organic matter reaction carried out in anaerobism section Optimal condition, gives full play to hydrolysis, the acidification of anaerobic technique, organic matter is decomposed into small point of easy biochemical degradation Son, anoxic pond carry out nitrification liquid reflux and carry out biological denitrificaion reaction, and the nitrate nitrogen of aerobic tank, nitrite nitrogen are carried out denitrification and taken off Nitrogen out, aerobic tank carry out the degradation of organic matter and the nitration reaction of ammonia nitrogen by control dissolved oxygen, residence time, reflux ratio.

UASB reactor is de- using the degradation of the reactor of anaerobic UASB and facultative anaerobic bacteria progress organic matter and biology Nitrogen, in the lower nitrate containing ammonia nitrogen of organic concentration, UASB reactor can carry out denitrification denitrogenation using facultative anaerobic bacteria, Anti-nitration reaction is carried out in a manner of UASB continuum micromeehanics, denitrification process is NO3- → NO2- → N2, micro- life in anti-digestion process C, N element needed for object obtains energy and cell synthesis by the degradation of organic matter and ammonia nitrogen, reach discharge standard.

In conclusion the utility model is particularly suitable for for processing high-salt wastewater containing organic matter (salt content 5%-20%) Mono-salt waste water (a kind of only inorganic salts ingredients), in high-salt wastewater low-boiling-point organic compound in evaporation process with steam successively through exchanging heat Subsequent sewage plant is discharged into after device condensation, the water inlet of preheating high-salt wastewater to be handled；MVR evaporator is recompressed using secondary steam The a large amount of steam sources of techniques save save operating cost, and high-salt wastewater is after MVR evaporator evaporation and concentration, into cyclonic separation Saturated salt mother liquor after device centrifugation desalination enters back into vapor seperator circulating and evaporating, fractional saturation salt mother liquor outlet, into scraper plate Thin film evaporator carries out being evaporated processing, and outlet mother liquid disposal amount is controlled 5% or so, and it is negative to be enriched with bring to avoid organic matter (evaporation capacity reduces, energy consumption increases, goes out salt quality) is influenced, scrapper thin film evaporator steam enters plant area after waste heat recycling condensation Sewage plant carries out sewage treatment, last qualified discharge.

Elaborate many details in the above description in order to fully understand the utility model, but this is practical new Type can also be implemented using other than the one described here other way, and those skilled in the art can be without prejudice to this reality With doing similar popularization in the case where novel intension, therefore the utility model is not limited by particular embodiments disclosed above.

Claims (8)

1. a kind of high-salt wastewater processing system, it is characterised in that: including high-salt wastewater water inlet pipe, the high-salt wastewater water inlet pipe according to Secondary to be connected after heat exchange equipment with MVR evaporator, the secondary steam of the MVR evaporator is connected to vapour compression machine, the MVR The saturated salt mother liquor of evaporator enters cyclone separator, and the separating liquid of the cyclone separator connects through return pipe and MVR evaporator Logical, the thickening salting liquid of the cyclone separator enters magma tank, and the magma tank is connected with centrifuge, the centrifuge separation Solid salt and saliferous mother liquor out；The saliferous mother liquor by reflux branch and outlet branch shunted, the reflux branch and Heat pump is connected, by heat pump by a part of saliferous Recycling Mother Solution to MVR evaporator；The outlet branch and scrapper thin film evaporator Be connected, dried another part saliferous mother liquor scrapper thin film evaporator for solid salt by outlet branch, remaining condensate liquid into Enter sewage plant.

2. high-salt wastewater processing system according to claim 1, it is characterised in that: the saliferous of the MVR evaporator is concentrated Liquid is recycled to MVR evaporator through heat exchanger after branch pipe, heat pump, and the secondary steam of the MVR evaporator is through vapour compression machine Into heat exchanger and the heat exchange of saliferous concentrate, the condensed secondary steam that cools down enters condensate drum.

3. high-salt wastewater processing system according to claim 2, it is characterised in that: the condensate liquid and height of the condensate drum The water inlet of salt waste water heat exchange in heat exchange equipment one, the condensed water after heat exchange cools down are delivered to sewage plant by the road.

4. high-salt wastewater processing system according to claim 2, it is characterised in that: the not condensing of the condensate drum is through true Empty pumping goes out water inlet heat exchange in heat exchange equipment two with high-salt wastewater, and the not condensing of the condensate drum cools down through heat exchange Condensed water afterwards is delivered to sewage plant by the road, and condensed water enters sewage after heat exchange in the not condensing of the condensate drum It stands, fixed gas by pipeline enters exhaust treatment system.

5. high-salt wastewater processing system according to claim 1, it is characterised in that: the vapour compression machine is roots-type pressure Contracting machine or centrifugal compressor.

6. high-salt wastewater processing system according to claim 1, it is characterised in that: be equipped with blender in the magma tank.

7. high-salt wastewater processing system according to claim 1-6, it is characterised in that: the sewage plant include according to Conditioning tank, Anaerobic Sequencing Bath Reactor, anaerobic pond, anoxic pond, aerobic tank, the secondary settling tank of secondary connection are connected to UASB reactor, The mixed liquor of the anoxic pond is back to anaerobic pond, and the mixed liquor of the aerobic tank is back to anoxic pond, the work of the secondary settling tank Property sludge reflux is to anoxic pond.

8. high-salt wastewater processing system according to claim 7, it is characterised in that: the supernatant of the secondary settling tank is boosted Pond and delivery pump are delivered to UASB reactor.