CN104609631A - High-salt iron phosphate liquid waste zero-emission treatment device and method - Google Patents
High-salt iron phosphate liquid waste zero-emission treatment device and method Download PDFInfo
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- CN104609631A CN104609631A CN201510024867.5A CN201510024867A CN104609631A CN 104609631 A CN104609631 A CN 104609631A CN 201510024867 A CN201510024867 A CN 201510024867A CN 104609631 A CN104609631 A CN 104609631A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a high-salt iron phosphate liquid waste zero-emission treatment device. The device structurally comprises a pre-treatment (PT) system, a reverse osmosis (RO) treatment system and an evaporative crystallization (VC) treatment system. The high-salt iron phosphate liquid waste zero-emission treatment device has the advantages as follows: the device is designed for high salt of the high-salt iron phosphate liquid waste, the high-salt iron phosphate liquid waste is subjected to pre-treatment to remove part of suspended solids and is subjected to reverse osmosis desalination, concentration reduction and reverse osmosis producing water recycling, reverse osmosis concentrated water is subjected to evaporative crystallization treatment finally, condensate water produced through evaporative crystallization is recycled, waste salt is conveyed outwards, and the purpose of zero liquid emission is achieved. The high-salt iron phosphate liquid waste zero-emission treatment device has the specific advantages as follows: pre-treatment, reverse osmosis and evaporative crystallization are organically combined; 2, the reverse osmosis is adopted for concentration reduction, so that the cost of follow-up evaporative crystallization is reduced; 3, an evaporative crystallization technology combining falling film evaporation and MVR (mechanical vapor recompression) is adopted, energy is saved, the efficiency is high, and the operation cost is reduced; 4, the purposes of water recycling and zero liquid emission are achieved.
Description
Technical field
What the present invention relates to is tertiary iron phosphate height bisulfate waste liquor zero discharge treatment devices and methods therefor, belongs to the technical field of Industrial Wastewater Treatment.
Background technology
Tertiary iron phosphate is the desirable precursor material of anode material for lithium-ion batteries, a large amount of tertiary iron phosphate waste water can be produced in the production process of tertiary iron phosphate, it contains heavy metal, nitrogen, phosphorus, other inorganic salt, meeting serious environment pollution, several years ago because project is little, can directly utilize lime method by heavy metal precipitation, produce a large amount of mud, by nitrogen useful in water, phosphoric is wasted, at present, along with the production-scale expansion of tertiary iron phosphate, tertiary iron phosphate method of wastewater treatment originally can not meet actual needs, just inquiring into the nitrogen utilized in tertiary iron phosphate waste water, phosphoric, generate ammonium sulfate and magnesium ammonium phosphate fertilizer, nitrogen in water, phosphorus can qualified discharge, but ferric sulfate height bisulfate waste liquor can be produced, if around sewage work or receiving water body can not accept a large amount of salts, this needs to carry out liquid zero emission process to tertiary iron phosphate height bisulfate waste liquor.
Summary of the invention
What the present invention proposed is a kind of tertiary iron phosphate height bisulfate waste liquor zero discharge treatment devices and methods therefor, its objective is for remaining tertiary iron phosphate height bisulfate waste liquor after tertiary iron phosphate waste water extraction chemical fertilizer, be intended to utilize pre-treatment, reverse osmosis treatment system, evaporative crystallization treatment system to carry out liquid zero emission process to tertiary iron phosphate height bisulfate waste liquor.Tertiary iron phosphate height bisulfate waste liquor TDS 30000 ~ 70000mg/L before process, water outlet TDS 60 ~ 140mg/L after process, clearance reaches 99.8%, it not only solves the pollution problem of tertiary iron phosphate height bisulfate waste liquor, process water outlet reaches the requirement of water of productive use and in addition reuse, reaches the object of liquid zero emission.
Technical solution of the present invention: tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device, its structure comprises preprocessing system (PT), reverse osmosis treatment system (RO), evaporative crystallization treatment system (VC); The wherein PT of preprocessing system (PT)
oUTthe RO of water outlet and reverse osmosis treatment system
iNwater-in connects, the RO of reverse osmosis treatment system (RO)
oUTdense water water outlet connects with the dense water water-in of the CW of evaporative crystallization treatment system (VC), the PW water of condensation water-in of reverse osmosis treatment system (RO) and the PW of evaporative crystallization
2water of condensation water outlet connects; Described preprocessing system (PT) connects tertiary iron phosphate height bisulfate waste liquor pipe (WW), more medium filter backwash water rising pipe (SW) respectively; Evaporative crystallization treatment system (VC) connects the salt-pepper noise (CC) of fresh vapour pipe (ST), outward transport respectively.
Tertiary iron phosphate height bisulfate waste liquor Zero discharge treatment method, comprises the steps:
1) tertiary iron phosphate height bisulfate waste liquor removes part suspended substance by preprocessing system, and backwash draining returns waste water processing station;
2) by the further desalting treatment of reverse osmosis treatment system, reverse osmosis produced Water circulation, reverse osmosis concentrated water concentrates decrement;
3) carry out evaporative crystallization process by evaporative crystallization treatment system, abraum salt is sent outside, recycling condensing water, finally reaches the object of liquid zero emission.
Feature of the present invention, the design that the high salinity that the present invention be directed to tertiary iron phosphate height bisulfate waste liquor carries out, tertiary iron phosphate height bisulfate waste liquor first divides suspended substance through pre-treatment removal unit, again through reverse osmosis desalination, concentrated decrement, reverse osmosis produced Water circulation, reverse osmosis concentrated water finally by evaporative crystallization process, the recycling condensing water of evaporative crystallization, abraum salt is transported outward, and reaches the object of liquid zero emission.Concrete advantage is: 1. pre-treatment, reverse osmosis, evaporative crystallization are organically combined, 2. reverse osmosis is utilized to carry out concentrated decrement, reduce the expense of subsequent evaporation crystallization, 3. falling film evaporation is utilized to recompress with MVR(steam mechanical) evaporative crystallization technique that combines, efficient energy-saving, reduce working cost and 4. both reached Water circulation, reach again the object of liquid zero emission.
Accompanying drawing explanation
Accompanying drawing 1 is the overall structure schematic diagram of tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device.
Accompanying drawing 2 is structural representations of tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device.
Accompanying drawing 3 is structural representations of the evaporation and crystallization system of tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device.
Accompanying drawing 4 is embodiment water balance figure of tertiary iron phosphate height bisulfate waste liquor zero discharge treatment devices and methods therefor.
In accompanying drawing 1 represents that raw water box, 2 represents that more medium filter, 3 represents that intermediate water tank, 4 represents that the cartridge filter, 5 of reverse osmosis represents that reverse osmosis unit, 6 represents that the product water tank, 7 of reverse osmosis represents that the dense water tank, 8 of reverse osmosis represents that evaporation and crystallization system, 9 represents scale inhibitor dosing system; WW represents tertiary iron phosphate height bisulfate waste liquor pipe (sending here after waste water processing station nitrogen, phosphorus recycling), SW represents more medium filter backwash water rising pipe (returning waste water processing station), PT
oUTrepresent water outlet, the RO of preprocessing system
iNrepresent water-in, the RO of reverse osmosis treatment system
oUTrepresent that dense water water outlet, the CW of reverse osmosis treatment system represent the dense water water-in of evaporative crystallization treatment system, ST represents fresh vapour pipe, ST
1represent the fresh steam of 1#, ST
2represent the fresh steam of 2#, PW
1represent product water, the PW of reverse osmosis
2represent the water of condensation water outlet of evaporative crystallization treatment system, PW represents the water of condensation water-in of reverse osmosis treatment system, CC represents salt-pepper noise, PT represents preprocessing system, RO represents reverse osmosis treatment system, VC represents evaporative crystallization treatment system 8; B
1represent backwash blower fan, the P of more medium filter
1represent raw water pump, P
2represent backwashing pump, the P of more medium filter
3represent topping-up pump, the P of reverse osmosis
4represent high-pressure pump, the P of reverse osmosis
5represent the transferpump of reverse osmosis concentrated water.H
1represent distilled water preheater, H
2represent feed preheater, H
3represent mother liquor preheater, V
1represent Falling film heat transfer device, V
2represent pump feed evaporator, S
1represent falling film separator, S
2represent crystal separator, S
3represent whizzer, B
2represent vapour compressor, T
1represent distilled water tank, T
2represent feed liquid concentration tank, T
3represent mother liquor case, P
8-1represent falling liquid film recycle pump, P
8-2represent forced circulation pump, P
8-3represent discharging pump, P
8-4represent mother liquor pump, P
8-5represent distilled water pump.
Embodiment
Contrast accompanying drawing 1, tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device, its structure comprises preprocessing system PT, reverse osmosis treatment system RO, evaporative crystallization treatment system VC; The wherein water outlet PT of preprocessing system PT
oUTwith the water-in RO of reverse osmosis treatment system
iNconnect, the dense water water outlet RO of reverse osmosis treatment system
oUTconnect with the dense water water-in CW of evaporative crystallization treatment system VC, the water of condensation water outlet PW of evaporative crystallization
2connect with the water of condensation water-in PW of reverse osmosis treatment system; Described preprocessing system PT is connected to tertiary iron phosphate height bisulfate waste liquor pipe WW, more medium filter backwash water rising pipe SW respectively; Evaporative crystallization treatment system VC is connected to the salt-pepper noise CC of fresh vapour pipe ST, outward transport respectively.
Contrast accompanying drawing 2, preprocessing system PT, its structure comprises raw water box 1, more medium filter 2, intermediate water tank 3, raw water pump P
1, more medium filter backwashing pump P
2, more medium filter backwash blower fan B
1; After waste water processing station nitrogen, phosphorus recycling, wherein (send) water-in that tertiary iron phosphate height bisulfate waste liquor pipe WW receives raw water box 1 here, raw water box 1 water outlet is by raw water pump P
1receive the water-in of more medium filter 2, the water outlet of raw water box 1 is also by the backwashing pump P of more medium filter
2be connected to the backwash water-in of more medium filter 2, the backwash blower fan B of more medium filter
1be connected to the backwash blast inlet of more medium filter 2, the backwash water port of more medium filter 2 connects more medium filter backwash water rising pipe SW(and returns waste water processing station), the water outlet of more medium filter 2 connects the water-in of intermediate water tank 3, and the water outlet of intermediate water tank is connected to the water outlet PT of preprocessing system
oUT.
Contrast accompanying drawing 2, reverse osmosis treatment system RO, its structure comprises the topping-up pump P of the cartridge filter 4 of reverse osmosis, reverse osmosis unit 5, the product water tank 6 of reverse osmosis, the dense water tank 7 of reverse osmosis, scale inhibitor dosing system 9, reverse osmosis
3, reverse osmosis high-pressure pump P
4, reverse osmosis concentrated water transferpump P
5; The wherein water-in RO of reverse osmosis system
iNby the topping-up pump P of reverse osmosis
3be connected to the water-in of the cartridge filter 4 of reverse osmosis, scale inhibitor dosing system 9 is also connected to the water-in of the cartridge filter 4 of reverse osmosis, and the water outlet of cartridge filter 4 passes through the high-pressure pump P of reverse osmosis
4be connected to the water-in of reverse osmosis unit 5, the product water PW of reverse osmosis
1connect the water-in of the product water tank 6 of reverse osmosis, the dense water water outlet of reverse osmosis unit 5 connects the water-in of the dense water tank 7 of reverse osmosis, and the water outlet of the dense water tank 7 of reverse osmosis passes through the transferpump P of reverse osmosis concentrated water
5be connected to the dense water water outlet RO of reverse osmosis system
oUT, the water of condensation water-in PW of reverse osmosis treatment system is also connected to the water-in of the product water tank 6 of reverse osmosis.
Contrast accompanying drawing 3, evaporation and crystallization system VC, its structure comprises distilled water preheater H
1, feed preheater H
2, mother liquor preheater H
3, Falling film heat transfer device V
1, pump feed evaporator V
2, falling film separator S
1, crystal separator S
2, whizzer S
3, vapour compressor B
2, distilled water tank T
1, feed liquid concentration tank T
2, mother liquor case T
3, falling liquid film recycle pump P
8-1, forced circulation pump P
8-2, discharging pump P
8-3, mother liquor pump P
8-4, distilled water pump P
8-5.Wherein the dense water water-in CW of evaporative crystallization treatment system connects distilled water preheater H
1dense water inlet, distilled water preheater H
1dense water out connect feed preheater H
2dense water inlet, feed preheater H
2dense water out connect Falling film heat transfer device V
1liquor inlet, Falling film heat transfer device V
1side material liquid outlet connect falling film separator S
1fluid inlet, Falling film heat transfer device V
1end material liquid outlet through falling liquid film recycle pump P
8-1connect Falling film heat transfer device V
1circulation liquor inlet, be connected to forced circulation pump P simultaneously
8-2import, falling film separator S
1liquid outlet be also connected to falling liquid film recycle pump P
8-1import, falling film separator S
1vapour outlet and crystal separator S
2vapour outlet together through vapour compressor B
2compression receives Falling film heat transfer device V after heating up
1with pump feed evaporator V
2steam inlet, crystal separator S
2circulation material liquid outlet by forced circulation pump P
8-2connect pump feed evaporator V
2fluid inlet, pump feed evaporator V
2liquid outlet connect crystal separator S
2circulation fluid inlet, crystal separator S
2discharge port through discharging pump P
8-3connect feed liquid concentration tank T
2opening for feed and crystal separator S
2feedback outlet, feed liquid concentration tank T
2discharge port connect whizzer S
3opening for feed, feed liquid concentration tank T
2liquid outlet and whizzer S
3liquid outlet connect mother liquor case T
3fluid inlet, whizzer S
3discharge port connect salt-pepper noise CC, mother liquor case T
3liquid outlet through mother liquor pump P
8-4connect mother liquor preheater H
3fluid inlet, mother liquor preheater H
3liquid outlet be also connected to forced circulation pump P
8-2import, Falling film heat transfer device V
1vapor condenses water out, pump feed evaporator V
2vapor condenses water out and mother liquor preheater H
3vapor condenses water out be all connected to distilled water tank T
11# vapor condenses water inlet, fresh vapour pipe ST is divided into the fresh steam ST of 1#
1steam ST fresh in 2#
2, the fresh steam ST of 2#
2connect mother liquor preheater H
3steam inlet, the fresh steam ST of 1#
1connect feed preheater H
2steam inlet, feed preheater H
2vapor condenses water out connect distilled water tank T
12# vapor condenses water inlet, distilled water tank T
1distilled water (steam condenses) outlet through distilled water pump P
8-5be connected to distilled water preheater H
1distilled water import, distilled water preheater H
1distilled water outlet connect the water of condensation water outlet PW of evaporative crystallization treatment system
2.
Acid iron height bisulfate waste liquor Zero discharge treatment method, comprises the steps:
1) tertiary iron phosphate height bisulfate waste liquor removes part suspended substance by preprocessing system, and backwash draining returns waste water processing station;
2) by the further desalting treatment of reverse osmosis treatment system, reverse osmosis produced Water circulation, reverse osmosis concentrated water concentrates decrement;
3) carry out evaporative crystallization process by evaporative crystallization treatment system, abraum salt is sent outside, recycling condensing water, finally reaches the object of liquid zero emission.
Described 1) tertiary iron phosphate height bisulfate waste liquor is by preprocessing system, and specifically tertiary iron phosphate height bisulfate waste liquor passes through raw water box, raw water pump, more medium filter, intermediate water tank successively until the water outlet of preprocessing system.Wherein raw water box receives tertiary iron phosphate height bisulfate waste liquor; The water outlet of raw water box is pressurizeed through raw water pump, and filter suspended substance by more medium filter, more medium filter regularly carries out air water backwash, the suspended substance that backwash is fallen to retain through the backwash water pump of more medium filter and backwash blower fan, ensures the normal work of more medium filter; The backwash draining of more medium filter returns waste water processing station.
Described 2) by reverse osmosis treatment system, specifically preprocessing system water outlet successively by the high-pressure pump of the topping-up pump of reverse osmosis, cartridge filter, reverse osmosis, reverse osmosis unit to the product water tank of reverse osmosis; The dense water of reverse osmosis unit successively by the dense water tank of reverse osmosis, the transferpump of reverse osmosis concentrated water to the dense water water outlet of reverse osmosis system.Wherein cartridge filter is protected reverse osmosis unit; Scale inhibitors is added to prevent reverse osmosis membrane fouling before reverse osmosis unit; The high-pressure pump of reverse osmosis provides 25 ~ 140 kg/cm
2pressure ensure that the separation of reverse osmosis unit to tertiary iron phosphate height bisulfate waste liquor concentrates, can containing the tertiary iron phosphate height bisulfate waste liquor process of TDS 30000 ~ 70000mg/L to water outlet TDS 60 ~ 140mg/L, TDS clearance reaches 99.8%, the reuse as water of productive use; According to tertiary iron phosphate height bisulfate waste liquor TDS 30000 ~ 70000mg/L, choose the reverse osmosis rate of recovery 75 ~ 56.25%, dense water TDS 120000 ~ 160000mg/L, so that the evaporative crystallization of next step economy.
Described 3) by evaporative crystallization treatment system, specifically the reverse osmosis concentrated water of reverse osmosis treatment system carries out evaporative crystallization by distilled water preheater, feed preheater, Falling film heat transfer device, falling film separator, falling liquid film recycle pump, forced circulation pump, pump feed evaporator, crystal separator, discharging pump, feed liquid concentration tank, whizzer successively; Wherein distilled water preheater utilizes distilled water to carry out preheating to reverse osmosis concentrated water; And then utilize fresh steam to carry out preheating through feed preheater, improve the temperature of feeding liquid as far as possible; Falling film heat transfer device utilizes steam to evaporate feeding liquid, the feed liquid that Falling film heat transfer device evaporates is separated by falling film separator, the end liquid of isolated feed liquid and Falling film heat transfer device is returned Falling film heat transfer through falling liquid film recycle pump and is thought highly of new evaporation, simultaneously, after circulation feed liquid reaches predetermined concentration, utilize falling liquid film recycle pump to be discharged to pump feed evaporator, the isolated steam of falling film separator and the crystal separator steam of discharging through vapour compressor pressurize heat up after be supplied to Falling film heat transfer device and pump feed evaporator as evaporating thermal source; The isolated feed liquid of falling film separator, crystal separator circulation discharging and the mother liquor after the heating of mother liquor preheater are squeezed into pump feed evaporator through forced circulation pump together and are evaporated further, and utilize crystal separator to carry out Crystallization Separation, discharging is discharged to feed liquid concentration tank through discharging pump and concentrates further, isolate salt-pepper noise outward transport through whizzer again, part discharging returns crystal separator Crystallization Separation again; The fluid of feed liquid concentration tank and the fluid of whizzer are all recovered to mother liquor case, then through the pressurization of mother liquor pump, utilize enter pump feed evaporator after fresh steam preheating and evaporate through mother liquor preheater; Feed preheater and mother liquor preheater all utilize fresh steam as thermal source; The steam condensate of Falling film heat transfer device, pump feed evaporator, feed preheater and mother liquor preheater is all recovered to distilled water tank, and through distilled water pump forced feed distilled water preheater as thermal source.
Embodiment
For certain new forms of energy enterprise produces the project assorted tertiary iron phosphate height bisulfate waste liquor zero discharge treatment project of 30,000 tons of tertiary iron phosphates per year.In tertiary iron phosphate wastewater treatment process, extract remaining tertiary iron phosphate height bisulfate waste liquor after chemical fertilizer and enter native system and carry out liquid zero emission process.
1. water quality treatment, the water yield
Influent quality, water yield Main Numerical are as follows:
2. reverse osmosis produced water and reverse osmosis concentrated liquid water quality, the water yield
Reverse osmosis produced water and reverse osmosis concentrated liquid water quality, the water yield are as follows:
Reverse osmosis concentrated liquid carries out evaporative crystallization process again.
3. technical process and water balance
Technical process and water balance figure are shown in accompanying drawing 4.
4. system main design parameters
(1) preprocessing system comprises:
The reverse osmosis of STRO(ductwork type) former pond: V=100m
3anticorrosion 1 of carbon steel;
STRO raw water pump: Q=120m
3/ h, H=30m, N=15kW 2 (1 is standby with 1);
STRO pre-treatment more medium filter: Q=60m3/h, φ 3200mm × (straight section) 1800mm × 12mm(end socket 14mm), filling filtrate and bed course have: hard coal: particle diameter 0.8 ~ 1.2mm, H=300mm, fine quartz sand: particle diameter 0.45 ~ 0.6mm, H=800mm, rubble sand: particle diameter 1 ~ 2mm, H=100mm, carbon steel line with rubber material 3 (2 is standby with 1);
More medium filter backwash water pump: Q=440m3/h, H=25m, N=55KW 2 (1 is standby with 1);
The backwash blower fan of more medium filter: Q=25Nm3/min, P=0.07MPa, N=45KW 2 (1 is standby with 1);
Intermediate water tank: V=100m
3anticorrosion 1 of carbon steel.
(2) reverse osmosis treatment system comprises:
Reverse osmosis membrane assembly is most important parts in reverse osmosis units.Feature for tertiary iron phosphate height bisulfate waste liquor is selected " ductwork type reverse osmosis " (i.e. STRO), because ductwork type reverse osmosis membrane assembly combines the advantage of ductwork type passage and the design of rolled membrane module two aspect, there is the narrow and passage of pipe network, overcome the shortcoming of other ordinary RO membrane assembly, flow dynamics is optimized greatly, decreases pollution common in other reverse osmosis membrane assembly and scale problems to a great extent.
STRO topping-up pump: Q=35m3/h, H=45m, N=15KW, flow passage components 2205 material 5 (4 is standby with 1);
STRO chemicals dosing plant is as follows:
1. STRO Scale inhibitors chemicals dosing plant: Scale inhibitors batch meter (joining agitator): V=1000L, PE material 2, anti-sealant dosing pump (band frequency conversion): rice pauses sieve GM0050 type, Q=50L/h, P=1.0MPa, N=0.37kW, pump head PVC material 5 (4 is standby with 1), and supporting y-type filter, pulse buffer, safety valve, reverse checkvalve etc., the anticorrosion frame of carbon steel, local control box 1 overlap;
2. STRO matting chemicals dosing plant: cleaning water tank (band N=0.55kW, SS316L material stirring device): V=5000L, PE material 1, flushing water pump: Q=80m
3/ h, H=40m, N=22kW, SUS316 material 3 (2 is standby with 1), 1# clean-out system batch meter (joining agitator): V=1000L, PE material 1, 1# clean-out system volume pump (band frequency conversion): rice pauses sieve GM0500 type, Q=500L/h, P=0.7MPa, N=0.75kW, pump head PVC material 2 (1 is standby with 1), 2# clean-out system batch meter (joining agitator): V=1000L, PE material 1, 2# clean-out system volume pump (band frequency conversion): rice pauses sieve GM0500 type, Q=500L/h, P=0.7MPa, N=0.75kW, pump head PVC material 2 (1 is standby with 1), acid volume pump (band frequency conversion): rice pauses sieve GM0050 type, Q=50L/h, P=1.0MPa, N=0.37kW, pump head PVC material 3 (2 is standby with 1), supporting y-type filter, pulse buffer, safety valve, reverse checkvalve etc., the anticorrosion frame of carbon steel, local control box,
STRO cartridge filter: Q=35m3/h, SS304 material 4, supporting large flux foldable filter element: RIZONFLOW type, L=40 ", external diameter Φ=152mm, filtering accuracy be 10 μm, PP material 1/platform;
STRO high-pressure pump (band frequency conversion): CAT plunger tpe, Q=35m3/h, H=1200m, N=140kW, flow passage components 2507 material 4;
STRO recycle pump (band frequency conversion): Grandfos is vertical, Q=90m3/h, H=35m, N=18.5kW, flow passage components 2507 material 8;
STRO system: be divided into 4 cover systems, often overlapping treatment capacity is 32.5 m
3/ h; STRO film selects German Tenche STRO film, membrane area 25m
2/ only, nominal pressure 120Bar.System is one-level one section, and every cover system is divided into 2 groups, every 5 film cascades, and often organize 55 films, every cover system is totally 110 films, and 4 cover systems are totally 440 films; Permeant flux is 8 LMH; Working pressure 105 ~ 110 bar during operation; Often organize STRO membranous system to arrange recycle pump and reflux in order to dense water section, to meet the requirement of membranous system flooding quantity; The rate of recovery of STRO system is set to 70%; Frame carbon steel is anticorrosion, and often cover is equipped with independently high-pressure pump, pipe valve, automatically controlled and instrument etc.;
The dense water tank of STRO: V=50m
3anticorrosion 1 of carbon steel;
The transferpump of the dense water of STRO: Q=40m
3/ h, H=30m, N=5.5kW flow passage components 316L material 2 (1 is standby with 1).
(3) evaporative crystallization treatment system comprises:
Evaporative crystallization treatment system adopts MVR system to reach energy-conservation object, has selected MVR coupling falling liquid film+forced circulation evaporation crystal system; The floor space of this vapo(u)rization system is less than traditional multiple-effect evaporator, compact construction, and evaporation area is also few than conventional evaporator, improves evaporation effect and the work-ing life of vaporizer.
Distilled water preheater: plate-type heat exchanger heat interchanging area F=25m
2, Q=120 m
3/ h, the temperature difference 25 DEG C, 1.0MPa, material contact material 316L 1;
Feed preheater: plate-type heat exchanger heat interchanging area F=25m
2, Q=120 m
3/ h, the temperature difference 25 DEG C, 1.0MPa, material contact material 316L 1;
Falling film heat transfer device: heat interchanging area F=800m
2, material contact material 316L 1 overlap;
Falling film separator: diameter=2400mm, material contact material 316L 1 overlaps;
Vapour compressor (band frequency conversion): German Piller, N=1250kW, impeller 2205, housing 316L 1 overlap (2 series connection);
Falling liquid film recycle pump: Q=100m3/h, H=25m, N=15kW, material contact material 316L 2 (1 is for subsequent use with 1 warehouse);
Forced circulation pump: Q=4000m3/h, H=4m, N=90kW, material contact material 316L 2 (1 is for subsequent use with 1 warehouse);
Pump feed evaporator: heat interchanging area F=1500m
2, material contact material 316L 1 overlap;
Crystal separator: diameter=2800mm, material contact material 316L 1 overlaps;
Discharging pump: Q=30m3/h, H=20m, N=5.5kW, material contact material 316L 2 (1 is for subsequent use with 1 warehouse);
Feed liquid concentration tank (band stirs): V=20m
3, 316L material 1;
Whizzer: HR400-N type Horizontal two-stage piston push rod whizzer, roller diameter 400/337mm, filtrating area length 145/155mm, maximum speed 1500 ~ 2200r/min, pusher stroke 40mm, mair motor N=11kW, Oil pump electrical machinery N=5.5kW, throughput 1 ~ 8T/h 1;
Mother liquor case: V=20m
3, 316L material 1;
Mother liquor pump: Q=30m3/h, H=20m, N=5.5kW, material contact material 316L 2 (1 is for subsequent use with 1 warehouse);
Mother liquor preheater: coil tube type heat interchanging area F=10m
2, Q=30 m
3/ h, the temperature difference 25 DEG C, 1.0MPa, material contact material 316L 1;
Distilled water tank: V=50m
3, SS304 material 1;
Distilled water pump: Q=100m3/h, H=25m, N=15kW, material contact material SS304 2 (1 is standby with 1).
(4) supporting in addition:
Operation system setting 1 volume is 3m
3technique compressed air reservoir and 1 volume be 5m
3instrument valve air reservoir, storage tank material is Q345R; Supporting DCS Controlling System, instrument, valve, pipeline, installing material etc.
Claims (8)
1. tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device, is characterized in that comprising preprocessing system (PT), reverse osmosis treatment system (RO), evaporative crystallization treatment system (VC); The wherein PT of preprocessing system (PT)
oUTthe RO of water outlet and reverse osmosis treatment system
iNwater-in connects, the RO of reverse osmosis treatment system (RO)
oUTdense water water outlet connects with the dense water water-in of the CW of evaporative crystallization treatment system (VC), the PW water of condensation water-in of reverse osmosis treatment system (RO) and the PW of evaporative crystallization
2water of condensation water outlet connects; Described preprocessing system (PT) connects tertiary iron phosphate height bisulfate waste liquor pipe (WW), more medium filter backwash water rising pipe (SW) respectively; Evaporative crystallization treatment system (VC) connects the salt-pepper noise (CC) of fresh vapour pipe (ST), outward transport respectively.
2. tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device according to claim 1, it is characterized in that described preprocessing system (PT), its structure comprises raw water box (1), more medium filter (2), intermediate water tank (3), P
1the P of raw water pump, more medium filter
2backwash blower fan (the B of backwashing pump, more medium filter
1); Tertiary iron phosphate height bisulfate waste liquor wherein after waste water processing station nitrogen, phosphorus recycling, connect the water-in of raw water box (1) by tertiary iron phosphate height bisulfate waste liquor pipe (WW), the water outlet of raw water box (1) passes through P
1raw water pump connects the water-in of more medium filter (2), and the water outlet of raw water box (1) is also by the P of more medium filter
2backwashing pump connects the backwash water-in of more medium filter (2), the backwash blower fan of more medium filter connects the backwash blast inlet of more medium filter (2), the backwash water port of more medium filter (2) connects more medium filter backwash water rising pipe (SW), return waste water processing station, the water outlet of more medium filter (2) connects the water-in of intermediate water tank (3), and the water outlet of intermediate water tank connects the water outlet (PT of preprocessing system
oUT).
3. tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device according to claim 1, is characterized in that the water-in (RO of the reverse osmosis system in described reverse osmosis treatment system (RO)
iN) by the P of reverse osmosis
3topping-up pump connects the water-in of cartridge filter (4) of reverse osmosis, and scale inhibitor dosing system (9) connects the water-in of the cartridge filter (4) of reverse osmosis, and the water outlet of cartridge filter (4) is by the P of reverse osmosis
4high-pressure pump connects the water-in of reverse osmosis unit (5), the PW of reverse osmosis
1produce the water-in of product water tank (6) that water connects reverse osmosis, the dense water water outlet of reverse osmosis unit (5) connects the water-in of the dense water tank (7) of reverse osmosis, and the water outlet of the dense water tank (7) of reverse osmosis is by the P of reverse osmosis concentrated water
5transferpump connects the dense water water outlet (RO of reverse osmosis system
oUT), the water-in of the water of condensation water-in (PW) of reverse osmosis treatment system, the product water tank (6) of reverse osmosis.
4. tertiary iron phosphate height bisulfate waste liquor zero discharge treatment device according to claim 1, it is characterized in that the dense water water-in (CW) in described evaporative crystallization treatment system connects the dense water inlet of distilled water preheater, the dense water out of distilled water preheater connects the dense water inlet of feed preheater, the dense water out of feed preheater connects the liquor inlet of Falling film heat transfer device, the side material liquid outlet of Falling film heat transfer device connects the fluid inlet of falling film separator, and the end material liquid outlet of Falling film heat transfer device is through P
8-1falling liquid film recycle pump connects circulation liquor inlet, the P of Falling film heat transfer device
8-2the import of forced circulation pump, the liquid outlet of falling film separator also connects P
8-1the import of falling liquid film recycle pump, the vapour outlet of falling film separator and the vapour outlet of crystal separator through vapour compressor compress heat up after receive the steam inlet of Falling film heat transfer device and pump feed evaporator, the circulation material liquid outlet of crystal separator passes through P
8-2forced circulation pump connects the fluid inlet of pump feed evaporator, and the liquid outlet of pump feed evaporator connects the circulation fluid inlet of crystal separator, and the discharge port of crystal separator is through P
8-3discharging pump connects the opening for feed of feed liquid concentration tank and the feedback outlet of crystal separator, the discharge port of feed liquid concentration tank connects the opening for feed of whizzer, the liquid outlet of feed liquid concentration tank is connected the fluid inlet of mother liquor case with the liquid outlet of whizzer, the discharge port of whizzer connects salt-pepper noise, and the liquid outlet of mother liquor case is through P
8-4mother liquor pump connects the fluid inlet of mother liquor preheater, and the liquid outlet of mother liquor preheater also connects P
8-2the import of forced circulation pump, the vapor condenses water out of Falling film heat transfer device, the vapor condenses water out of pump feed evaporator and mother liquor preheater H
3vapor condenses water out be all connected to distilled water tank T
11# vapor condenses water inlet, fresh vapour pipe is divided into the fresh steam of 1# and the fresh steam of 2#, and the fresh steam of 2# connects mother liquor preheater H
3steam inlet, the fresh steam of 1# connects the steam inlet of feed preheater, and the vapor condenses water out of feed preheater connects the 2# vapor condenses water inlet of distilled water tank, and the distilled water outlet of distilled water tank is through P
8-5distilled water pump connects the import of distilled water preheater distilled water, and the distilled water outlet of distilled water preheater connects the PW of evaporative crystallization treatment system
2water of condensation water outlet.
5. sour iron height bisulfate waste liquor Zero discharge treatment method as claimed in claim 1, is characterized in that comprising the steps:
1) tertiary iron phosphate height bisulfate waste liquor removes part suspended substance by preprocessing system, and backwash draining returns waste water processing station;
2) by the further desalting treatment of reverse osmosis treatment system, reverse osmosis produced Water circulation, reverse osmosis concentrated water concentrates decrement;
3) carry out evaporative crystallization process by evaporative crystallization treatment system, abraum salt is sent outside, recycling condensing water, finally reaches the object of liquid zero emission.
6. sour iron height bisulfate waste liquor Zero discharge treatment method as claimed in claim 5, it is characterized in that described step 1) tertiary iron phosphate height bisulfate waste liquor is by preprocessing system, specifically tertiary iron phosphate height bisulfate waste liquor passes through raw water box, raw water pump, more medium filter, intermediate water tank successively until the water outlet of preprocessing system; Wherein raw water box receives tertiary iron phosphate height bisulfate waste liquor; The water outlet of raw water box is pressurizeed through raw water pump, and filter suspended substance by more medium filter, more medium filter regularly carries out air water backwash, the suspended substance that backwash is fallen to retain through the backwash water pump of more medium filter and backwash blower fan, ensures the normal work of more medium filter; The backwash draining of more medium filter returns waste water processing station.
7. sour iron height bisulfate waste liquor Zero discharge treatment method as claimed in claim 5, it is characterized in that described step 2) by reverse osmosis treatment system, specifically preprocessing system water outlet successively by the high-pressure pump of the topping-up pump of reverse osmosis, cartridge filter, reverse osmosis, reverse osmosis unit to the product water tank of reverse osmosis; The dense water of reverse osmosis unit successively by the dense water tank of reverse osmosis, the transferpump of reverse osmosis concentrated water to the dense water water outlet of reverse osmosis system; Wherein cartridge filter is protected reverse osmosis unit; Scale inhibitors is added to prevent reverse osmosis membrane fouling before reverse osmosis unit; The high-pressure pump of reverse osmosis provides 25 ~ 140 kg/cm
2pressure ensure that the separation of reverse osmosis unit to tertiary iron phosphate height bisulfate waste liquor concentrates, can containing the tertiary iron phosphate height bisulfate waste liquor process of TDS 30000 ~ 70000mg/L to water outlet TDS 60 ~ 140mg/L, TDS clearance reaches 99.8%, the reuse as water of productive use; According to tertiary iron phosphate height bisulfate waste liquor TDS 30000 ~ 70000mg/L, choose the reverse osmosis rate of recovery 75 ~ 56.25%, dense water TDS 120000 ~ 160000mg/L, so that the evaporative crystallization of next step economy.
8. sour iron height bisulfate waste liquor Zero discharge treatment method as claimed in claim 5, it is characterized in that described step 3) is by evaporative crystallization treatment system, specifically the reverse osmosis concentrated water of reverse osmosis treatment system carries out evaporative crystallization by distilled water preheater, feed preheater, Falling film heat transfer device, falling film separator, falling liquid film recycle pump, forced circulation pump, pump feed evaporator, crystal separator, discharging pump, feed liquid concentration tank, whizzer successively; Wherein distilled water preheater utilizes distilled water to carry out preheating to reverse osmosis concentrated water; And then utilize fresh steam to carry out preheating through feed preheater, improve the temperature of feeding liquid as far as possible; Falling film heat transfer device utilizes steam to evaporate feeding liquid, the feed liquid that Falling film heat transfer device evaporates is separated by falling film separator, the end liquid of isolated feed liquid and Falling film heat transfer device is returned Falling film heat transfer through falling liquid film recycle pump and is thought highly of new evaporation, simultaneously, after circulation feed liquid reaches predetermined concentration, utilize falling liquid film recycle pump to be discharged to pump feed evaporator, the isolated steam of falling film separator and the crystal separator steam of discharging through vapour compressor pressurize heat up after be supplied to Falling film heat transfer device and pump feed evaporator as evaporating thermal source; The isolated feed liquid of falling film separator, crystal separator circulation discharging and the mother liquor after the heating of mother liquor preheater are squeezed into pump feed evaporator through forced circulation pump together and are evaporated further, and utilize crystal separator to carry out Crystallization Separation, discharging is discharged to feed liquid concentration tank through discharging pump and concentrates further, isolate salt-pepper noise outward transport through whizzer again, part discharging returns crystal separator Crystallization Separation again; The fluid of feed liquid concentration tank and the fluid of whizzer are all recovered to mother liquor case, then through the pressurization of mother liquor pump, utilize enter pump feed evaporator after fresh steam preheating and evaporate through mother liquor preheater; Feed preheater and mother liquor preheater all utilize fresh steam as thermal source; The steam condensate of Falling film heat transfer device, pump feed evaporator, feed preheater and mother liquor preheater is all recovered to distilled water tank, and through distilled water pump forced feed distilled water preheater as thermal source.
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