CN104402160B - A kind of energy-saving coal wastewater from chemical industry advanced treatment system and processing method thereof - Google Patents
A kind of energy-saving coal wastewater from chemical industry advanced treatment system and processing method thereof Download PDFInfo
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- CN104402160B CN104402160B CN201410713950.9A CN201410713950A CN104402160B CN 104402160 B CN104402160 B CN 104402160B CN 201410713950 A CN201410713950 A CN 201410713950A CN 104402160 B CN104402160 B CN 104402160B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
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Abstract
A kind of energy-conservation coal chemical industrial wastewater processing system and processing method thereof, this system includes forward osmosis membrane enrichment facility and multi-effect evaporator, forward osmosis membrane enrichment facility includes the airtight commuting case of FO film, draw liquid recycle device and clean water recovery device, the airtight commuting case of FO film is at least provided with one-level, draw liquid recycle device to be connected respectively through electrically operated valve with the airtight commuting cases of FO film at different levels, clean water recovery device is connected with drawing liquid recycle device, the airtight commuting cases of FO film at different levels pass sequentially through discharge opeing electrically operated valve and connect, and be connected with mother solution incinerator each through surmounting electrically operated valve.The method for the hyperosmosis characteristic of coal chemical industrial waste water, by prepare colligative property higher draw liquid, the permeable pressure head utilizing colligative properties of solution difference to bring, make coal chemical industrial waste water obtain recycle and reuse water resource while efficient concentration, produce electric energy；Running realizes automatic interlock control, can adjust the method for operation according to different flow conditions.
Description
Technical field
The present invention relates to a kind of advanced treatment system for coal chemical industrial waste water and method thereof, belong to wastewater treating technology field.
Background technology
So-called Coal Chemical Industry is with coal for raw material, by the reaction of a series of chemical technologies, is translated into gas, liquid, solid fuel and produces the industry of various chemical product.
China's richness coal, energy resource structure oil-poor, gas less determine developing rapidly of Chemical Industry, especially New Coal Chemical Industry.Traditional coal chemical industry refers to coal gasification, liquefaction, coking and tar production, carbide acetylene chemical industry etc., also includes with coal for waste carbon materials and coal-based macromolecular material etc..New Coal Chemical is leading with coal gasification, including ammonia from coal, acetic acid, dimethyl ether etc..Coal chemical industry brings relatively overall situation problem while developing rapidly.
Coal Chemical Industry mainly includes a chemical process, secondary chemical process and the degree of depth chemical process of coal, coal gasification, liquefaction and coking, the synthesis gas chemical industry of coal, tar chemical industry and carbide acetylene chemical industry etc..Based on the difference of production technology Yu output product, Coal Chemical Industry process is broadly divided into coking of coal, coal carbide, coal gasification and coal liquefaction etc., and coal chemical industrial waste water is just mainly derived from this 4 production chains.
The feature main manifestations of coal chemical industrial waste water is: complicated components, all significantly high containing poisonous and harmful substances, COD value and colourities such as a large amount of solid suspended particles, volatile phenol, condensed-nuclei aromatics, pyrroles, furan, imidazoles, naphthalene, nitrogenous, the heterocyclic compound of oxygen, sulfur, cyanogen, oil, ammonia nitrogen and sulfide.Although the difference due to raw coal composition and manufacturing condition, Pollutants in Wastewater content and kind are not quite similar, but on the whole, the COD value of coal chemical industrial waste water is typically in 2000～5000mg/L, pH is 7.0～10.0, ammonia nitrogen is at 200～600mg/L, and volatile phenol is at 300～500mg/L, and cyanide is at 10～30mg/L.Owing to this pollutant levels such as waste water quality complicated component and ammonia nitrogen, volatile phenol, cyanide are high, there is the organic pollution of the multiple very difficult degradations such as pyridine, carbazole, biphenyl to exist in addition, up to standard bring bigger difficulty for processing.
The improvement of coal chemical industrial waste water and reuse technology progressively become the bottleneck that coal chemical industry develops rapidly, seek cost-effective method of wastewater treatment and are of great significance.
Coal chemical industrial waste water is that first kinds of pollution matter kind is many, the high concentrated organic wastewater of complicated component, depends merely on traditional physics and chemical method processes, it tends to be difficult to reach discharge standard.For the process of this waste water, it is commonly divided into coagulation, two stage treatment and advanced treating.
Coagulation and pretreatment, mainly include the methods such as coagulation, chemical precipitation, air supporting, to remove part lime-ash and oils, and the valuable materials such as the phenols in waste water and ammonia nitrogen is recycled；
Two stage treatment is mainly biochemical treatment, mainly includes A/O, A2/ O, SBR, UASB etc. and some emerging technique；
Deep treatment method mainly has active carbon adsorption, Ozonation, Wet Catalytic Oxidation Method and the Fenton reagent oxidizing process received much concern in recent years, nano-TiO2Photocatalytic oxidation and ultrasound cavitation effect etc..
Although in recent years for the process of different industries waste water, emerging many effective, the new technique of frontier nature, what have has application in actual production.But it is seen that, the drawback that some method exists due to self, its application receives certain restriction.Such as: the thorough degradation of contaminant of Physical, it is by a phase transfer to another phase by it；Chemical method is due to the needs amount of having high input chemical agent so that operating cost is higher, it is difficult to large-scale promotion, simultaneously it is also possible to produce secondary pollution.Biochemical method is less expensive, is a kind of method for treating water being widely adopted at present, but it be limited in that: 1) degradation speed is slower；2) selectivity of bacterial action is stronger；3) degraded is not thorough, it is possible to create poisonous intermediate product；4) partial aromatic compounds of group is difficult to be degraded.AogatePR research is pointed out, the treatment effect of some its single methods of deep oxidation method is unsatisfactory, even if satisfactory for result, price also costly, is difficult to promote.
Chinese patent literature CN102211839A disclosed " a kind of coal chemical industry wastewater treating method ", CN103880242A disclosed " a kind of coal chemical industrial waste water advanced treatment process ", CN103466903A disclosed " method utilizing microbial treatments coal chemical industrial waste water ", CN103833175A disclosed " coal chemical industrial waste water is processed into covering device ", CN101560045 disclosed " a kind of coal chemical wastewater treating technique ", CN102674634B disclosed " coal chemical wastewater treating technique " and CN101503267B disclosed " a kind of coal chemical industry wastewater treating method ", it it is mostly the improvement to conventional method, treatment effect has much room for improvement.
For this reason, it is necessary to reanalyse the characteristic of coal chemical industrial waste water, on the basis of biochemical treatment, develop coal chemical industrial waste water further treatment technique energy-conservation, efficient.
Osmosis is that the solution of two kinds of variable concentrations is every passing through the phenomenon semipermeable membrane entrance highly concentrated solution with semipermeable membrane (allowing solvent molecule to pass through, not allow the film that solute molecule passes through), hydrone or other solvent molecule from the solution of low concentration.The condition of its generation has two: one to be have semipermeable membrane, and two is that semipermeable membrane both sides have substance withdrawl syndrome poor.
Osmosis can be divided into again just permeates (FO), reverse osmosis (RO) and pressure damping infiltration (PRO).
(FO) process of just permeating is with the permeable pressure head of semipermeable membrane both sides for driving force, hydrone in solution is transmitted to low water chemistry gesture district (high ion concentration solution) from high water chemistry gesture district (low ion concns solution) by semipermeable membrane, and a kind of process of osmosis that solute molecule or ion are blocked.
Reverse osmosis (RO) process, is a kind of with pressure differential for motive force, isolates the membrance separation operation of solvent from solution.Because it is in opposite direction with what just permeating, therefore claims reverse osmosis.The osmotic pressure difference of different material can be utilized, use more than the reverse osmosis pressure of osmotic pressure, reach the purpose of separation, extraction, purification and concentration.
Pressure damping infiltration (PRO) is between just permeating the pilot process with reverse osmosis process, refer to that the in the reverse direction at permeable pressure head applies pressure, similar to reverse osmosis process, but hydrone remains and is diffused into high ion concentration side, similar to positive process of osmosis.
The colligative property that weak solution (comprises coal chemical industrial waste water) refers to the numerical value of the reduction of the vapor pressure lowering of solvent in weak solution, freezing point, the elevation of boiling point and osmotic pressure, only relevant with the amount of solute in solution, unrelated with the person's character of solute, colligative properties of solution draws liquid for exploitation special type and provides theoretical foundation, as long as namely configuration is necessarily colligative draws liquid, make its osmotic pressure higher than pending coal chemical industrial waste water, utilize osmosis, it is possible to concentrated further by coal chemical industrial waste water.
For this, need badly on the basis of biochemical treatment, develop energy-conservation coal chemical industrial waste water advanced treatment system, osmosis is utilized especially just to permeate the permeable pressure head that (FO) effect brings with colligative properties of solution difference, realize while coal chemical industrial waste water effectively disposes, recycles water resource, make full use of and just permeate the pressure reduction acquisition electric energy that (FO) produces, save the energy.
Summary of the invention
The present invention is directed to the deficiency that existing coal chemical industrial waste water treatment technology exists, according to the characteristic of coal chemical industrial waste water after biochemical treatment, utilize colligative properties of solution, it is provided that a kind of high treating effect, energy-conservation coal chemical industrial waste water advanced treatment system.This system a kind of deep treatment method to coal chemical industrial waste water is provided simultaneously.
The energy-saving coal wastewater from chemical industry advanced treatment system of the present invention, by the following technical solutions:
This system, including forward osmosis membrane enrichment facility and mother solution incinerator, forward osmosis membrane enrichment facility includes the airtight commuting case of FO film, draws liquid recycle device and clean water recovery device, the airtight commuting case of FO film is at least provided with one-level, draw liquid recycle device to be connected respectively through electrically operated valve with the airtight commuting cases of FO film at different levels, clean water recovery device is connected with drawing liquid recycle device, the airtight commuting cases of FO film at different levels pass sequentially through discharge opeing electrically operated valve and connect, and are connected with mother solution incinerator each through surmounting electrically operated valve.Mother solution incinerator is configured with combustion-supporting fuel (natural gas, diesel oil or coke-stove gas etc.) burner and exhaust gas cleaner.
The inside of the airtight commuting case of FO film arranges membrane component, and membrane component will be divided into mother solution district and draws liquid zone inside airtight for FO film commuting case, the top in mother solution district is provided with water inlet pipe, this water inlet pipe is provided with into water electrically operated valve；In the airtight commuting case of upper level FO film, the bottom in mother solution district is connected with the top in mother solution district in the next stage airtight commuting case of FO film by discharge opeing electrically operated valve, and in every airtight commuting case of one-level FO film, the bottom in mother solution district is connected with mother solution incinerator each through surmounting electrically operated valve simultaneously；Drawing the top of liquid zone in every airtight commuting case of one-level FO film and be connected with the liquid commuting case that draws drawing in liquid recycle device respectively through drawing liquid conveying pipe, the respective liquid that draws is carried to be provided with on pipe and is drawn liquid outlet electric valve door；Every airtight commuting case of one-level FO film draws the bottom of liquid zone be provided with and draw liquid and compensate electrically operated valve, and compensate pipe is connected by draw liquid between liquid compensation box with drawing drawing in liquid recycle device, draw liquid and compensate pipe is connected to and draw liquid compensation pump.
Draw the outside of liquid zone be provided with connect draw upper and lower, liquid zone draw liquid circulation pipe, draw liquid circulation pipe is provided with and draw liquid circulating pump.By draw liquid circulating pump will draw liquid drawing upper and lower, liquid zone formed circulation.
Mother solution district is provided with agitator and temperature-adjusting device with drawing in liquid zone.
Mother solution district is provided with COD on-line computing model, draws liquid zone and is provided with ionometer.
Draw liquid recycle device to include drawing liquid commuting case, draw liquid intermediate box, draw liquid multi-effect evaporator, draw liquid dissolving case, draw liquid compensation box and molten medicine-chest, draw liquid commuting case top and be provided with commuting case electrically operated valve and commuting case electric-powered air release valve, and be connected with drawing liquid intermediate box by commuting case electrically operated valve；Draw the bottom of liquid commuting case surmount pipe electrically operated valve by commuting case and draw liquid intermediate box and be connected；Draw liquid intermediate box top and be provided with intermediate box electric-powered air release valve, draw liquid intermediate box and draw liquid multi-effect evaporator and be connected；Draw liquid dissolving case to be connected with drawing liquid multi-effect evaporator,；The bottom drawing liquid compensation box is connected with the bottom drawing liquid dissolving case by compensation box import electrically operated valve；The bottom of molten medicine-chest is connected with the bottom drawing liquid compensation box by molten medicine outlet electric valve door.
Draw in liquid dissolving case and molten medicine-chest and be provided with agitator and ionometer.
Draw in liquid compensation box and be provided with ionometer.
Clean water device includes filtered water tank, clarified water pump and clear water pipe, and filtered water tank is connected with drawing liquid multi-effect evaporator, and clear water pipe is connected with filtered water tank, and clarified water pump is connected on clear water pipe, and clear water pipe is connected with molten medicine-chest.
Said system, also include infiltration energy utilization device, this device includes airtight rotor casing and turbine generation unit, turbine wheel it is provided with in rotor casing, turbine wheel is connected with turbine generation unit, the bottom of rotor casing is provided with rotor casing electric-powered air release valve, and rotor casing is connected with drawing liquid commuting case by rotor casing water inlet electrically operated valve, while rotor casing also with draw liquid intermediate box and be connected.
The processing method of said system, be:
First infiltration substance withdrawl syndrome (the ionic state amount of substance in solution and the molecular state amount of substance sum) S of analytical calculation coal chemical industrial waste water1According to required osmotic pressure (△ π, by whether determining for actual demands such as generatings), (with the approximate conversion of COD on-line computing model video data in running), show that the required airtight commuting case of first order FO film draws the ion concentration J of liquid1, J1More than S1, and draw the progression n of the airtight commuting case of FO film of needs and the number i of every grade of airtight commuting case of FO film；Then pass through and draw liquid recycle device preparation ion concentration J1Draw liquid, make to draw liquid and be full of the airtight commuting case of first order FO film；Open coal chemical industrial waste water water inlet electrically operated valve, coal chemical industrial waste water flows in the airtight commuting case of first order FO film, exchange with drawing liquid, make the hydrone in coal chemical industrial waste water freely reach and draw liquid, after dilution, the liquid that draws of volume increase realizes drawing liquid solute (normally gaseous) and the separation of water (solvent) by the multi-effect evaporator drawing in liquid recycle device, realize drawing the recycling and reuse of liquid solute, unnecessary water enters clean water device, it is achieved the recycling of water resource；Coal chemical industrial waste water is concentrated by the airtight commuting case of FO film step by step, finally cannot reconcentration or as required without further concentrate (general COD is when more than 600000mg/L) mother solution enter mother solution incinerator carry out burning disposal.
The present invention is directed to the hyperosmosis characteristic of coal chemical industrial waste water, by prepare colligative property higher draw liquid, the permeable pressure head utilizing colligative properties of solution difference to bring, while making coal chemical industrial waste water obtain efficient concentration, recycle and reuse water resource, produce electric energy；Meanwhile, running realizes automatic interlock control, can adjust the method for operation according to different flow conditions, it is simple to implement.Have the following characteristics that
1. make full use of colligative properties of solution, by prepare colligative property higher draw liquid (such as NH4HCO3Deng), utilize the Thief zone pressure reduction of itself and coal chemical industrial waste water, it is achieved while coal chemical industrial waste water efficient concentration, recyclable great lot of water resources；
2. it is big that the FO film adopted has membrane flux, the characteristic that concentration polarization phenomenon is few, can ensure the smooth realization of infiltration function；
3. the mother solution incinerator adopted is common apparatus, and special disposal high concentrated organic waste liquid utilizes high temperature (850-1100 DEG C) pyrolysis, can the fully Organic substance in decomposing wasting liquid and hazardous compound chloride, benzene, phenols, and have the following characteristics that
(1) tiny structure design, combustion safety is high, is provided with in stove and is not excluded for, before igniting, the function that flammable explosive gas cannot be lighted a fire, with gas explosion-proof in control program；
(2) automaticity is high, comprehensive online detection and control, flameholding.
(3) adopt atomizing lance, spray imperceptible granule, it is ensured that gasify in the air in stove, oxidation Decomposition, will not drip.
(4) adopting tangent line combustion atomization device internal mix formula twin fluid atomization device, its mixability, atomizing effect burning velocity is high, and excess air is low, can save a large amount of fuel.
(5) venturi effect is good, and the burning holdup time reaches more than 2 seconds, and burning is without dead angle.
(6) low-NO_x combustion technology, smokeless and odorless, without harmful gas, can burn organic exhaust gas and a small amount of solid simultaneously.
(7) comprehensive rational vent gas treatment purifier, it is ensured that environment protection emission is up to standard.
4. the osmotic energy that system produces can be converted into electric energy by the infiltration energy utilization device adopted, thus reducing cost for wastewater treatment；
5. make running realize automatic interlock control by automation instrument, it is simple to adjust the method for operation according to different flow conditions；
6. modularized design, according to coal chemical industrial waste water actual concentrations and other implementation conditions, independent assortment, can have stronger motility.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the energy-efficient coal chemical industrial wastewater processing system of the present invention.
nullIn figure: 1、Water inlet electrically operated valve，2、The airtight commuting case of FO film，3、Coal chemical industrial waste water agitator，4、Draw liquid agitator，5、Film frame，6、Membrane component，7、Coal chemical industrial waste water COD on-line computing model，8、Draw liquid ionometer，9、Temperature-adjusting device，10、Draw liquid delivery gauge，11、Draw liquid outlet electric valve door，12、Draw liquid circulating pump，13、Draw liquid commuting case，14、Commuting case Pressure gauge，15、Commuting case electrically operated valve，16、Airtight rotor casing，17、Turbine wheel，18、Turbine generation unit，19、Draw liquid intermediate box，20、Intermediate box electric-powered air release valve，21、Draw liquid multi-effect evaporator，22、Intermediate box overflow pipe，23、Draw liquid and dissolve case，24、Dissolve box mixer，25、Dissolve case ionometer，26、Compensation box import electrically operated valve，27、Draw liquid compensation box，28、Compensation box ionometer，29、Molten medicine outlet electric valve door，30、Molten medicine-chest，31、Molten medicine agitator，32、Draw liquid ionometer，33、Air-washer，34、Filtered water tank，35、Clarified water pump，36、The first order surmounts pipe electrically operated valve，37、Discharge opeing electrically operated valve，38、The second level surmounts pipe electrically operated valve，39、Mother solution incinerator import electrically operated valve，40、Mother solution incinerator，41、Draw liquid and compensate pump，42、Draw liquid and compensate electrically operated valve，43、Commuting case surmounts pipe electrically operated valve，44、Water supply pipe，45、Commuting case electric-powered air release valve，46、Rotor casing electric-powered air release valve，47、Rotor casing water inlet electrically operated valve，48、Hydraulic barrier，49、Combustion-supporting fuel burner，50、Exhaust gas cleaner.
Detailed description of the invention
The energy-efficient coal chemical industrial wastewater processing system of the present invention mainly includes forward osmosis membrane enrichment facility, mother solution incinerator 40 and infiltration energy utilization device, and each device is sequentially connected with by pipeline.The concrete structure of each device is as shown in Figure 1.
Forward osmosis membrane enrichment facility, including the airtight commuting case 2 (being provided with 3 grades in Fig. 1) of at least one-level FO film, draws liquid recycle device and clean water recovery device.
The bosom of the airtight commuting case 2 of single-stage FO film is provided with film frame 5, is provided with membrane component 6 in film frame 5.Airtight for FO film commuting case 2 is divided into mother solution district, left side (coal chemical industrial waste water district) and right side to draw liquid zone two parts by film frame 5, and twoth district, for being completely independent region, carry out mass transfer merely by membrane component 6.The top in mother solution district is provided with coal chemical industrial waste water water inlet pipe, this water inlet pipe is provided with into water electrically operated valve 1, coal chemical industrial waste water agitator 3, coal chemical industrial waste water COD on-line computing model 7 and temperature-adjusting device 9 (being arranged on bottom mother solution district) it is provided with in mother solution district, temperature-adjusting device 9 can be electric drive, it is also possible to be exchanger.Draw to be provided with in liquid zone and draw liquid agitator 4, draw liquid ionometer 8 and heater (be arranged on and draw bottom liquid zone), draw the outside of liquid zone be provided with connect its upper and lower draw liquid circulation pipe, draw liquid circulation pipe is provided with and draw liquid circulating pump 12, liquid will be drawn drawing the formation circulation of upper and lower, liquid zone by drawing liquid circulating pump 12, accelerate mass transfer.
In the airtight commuting case of upper level FO film 2, the bottom in mother solution district is connected with the top in mother solution district in the next stage airtight commuting case of FO film by discharging tube, discharging tube is provided with discharge opeing electrically operated valve 37, the bottom simultaneously concentrating liquid zone in every airtight commuting case of one-level FO film is connected with mother solution incinerator 40 each through surmounting pipe, surmount and pipe arranges electrically operated valve (first order in Fig. 1 surmounts pipe electrically operated valve 36 and the second level surmounts pipe electrically operated valve 38), surmount pipe and be connected with mother solution incinerator 40 by mother solution incinerator import electrically operated valve 39.Mother solution incinerator 40 is configured with combustion-supporting fuel (natural gas, diesel oil or coke-stove gas etc.) burner 49 and exhaust gas cleaner 50.Every airtight commuting case of one-level FO film draws the top of liquid zone and is connected with the airtight liquid commuting case 13 that draws respectively through drawing liquid conveying pipe, respective draw liquid conveying pipe is provided with draw liquid delivery gauge 10 and draw liquid outlet electric valve door 11.Every airtight commuting case of one-level FO film is drawn the bottom of liquid zone be provided with and draw liquid and compensate electrically operated valve 42, and with draw between liquid compensation box 27 by draw liquid compensate pipe be connected, draw liquid compensation pipe is connected to and draw liquid compensation pump 41, draw and liquid compensation box 27 is provided with compensation box ionometer 28.
Drawing liquid recycle device to include drawing liquid commuting case 13, draw liquid intermediate box 19, draw liquid multi-effect evaporator 21, draw liquid dissolving case 23, draw liquid compensation box 27 and molten medicine-chest 30, it is all airtight for drawing liquid commuting case 13, drawing liquid intermediate box 19, draw liquid multi-effect evaporator 21, draw liquid dissolving case 23 and draw liquid compensation box 27.It is airtight for drawing liquid commuting case 13, and its top is provided with commuting case Pressure gauge 14, commuting case electrically operated valve 15 and commuting case electric-powered air release valve 45, and is connected with the top drawing liquid intermediate box 19 by commuting case electrically operated valve 15；Draw the bottom of liquid commuting case 13 to surmount pipe electrically operated valve 43 by commuting case and be connected with the bottom drawing liquid intermediate box 19.Drawing liquid intermediate box 19 and be internally provided with hydraulic barrier 48, its top is provided with intermediate box electric-powered air release valve 20.Draw liquid intermediate box 19 and draw liquid multi-effect evaporator 21 bottom and be connected, and top is connected to intermediate box overflow pipe 22.Draw liquid dissolving case 23 to be connected with drawing liquid multi-effect evaporator 21, draw and be provided with dissolving box mixer 24 in liquid dissolving case 23 and dissolve case ionometer 25, draw and be connected to air-washer 33 (aeration tower) bottom liquid dissolving case 23.The bottom drawing liquid compensation box 27 is connected with the bottom drawing liquid dissolving case 23 by compensation box import electrically operated valve 26, draws and is provided with compensation box ionometer 28 in liquid compensation box 27.The bottom of molten medicine-chest 30 is connected with the bottom drawing liquid compensation box 27 by molten medicine outlet electric valve door 29, and molten medicine-chest 30 is connected with water supply pipe 44, and is provided with molten medicine agitator 31 in it and draws liquid ionometer 32.Multi-effect evaporator is common apparatus.
Clean water device includes filtered water tank 34, clarified water pump 35 and clear water pipe, and filtered water tank 34 is connected with drawing liquid multi-effect evaporator 21, and clear water pipe is connected with filtered water tank 34, and clarified water pump 35 is connected on clear water pipe.Clear water pipe can pass through valve and be connected with molten medicine-chest 30, so that the clear water drawing liquid multi-effect evaporator 21 generation to be utilized.
Infiltration energy utilization device, including airtight rotor casing 16 and turbine generation unit 18, is provided with turbine wheel 17 in rotor casing 16, turbine wheel 17 is connected with turbine generation unit 18, and the bottom of rotor casing 16 is provided with rotor casing electric-powered air release valve 46.Rotor casing 16 is connected with drawing liquid commuting case 13 by rotor casing water inlet electrically operated valve 47, simultaneously also with draw liquid intermediate box 19 and be connected.
The running of said system, as described below.
Before operation, it is first determined following items important parameter:
1, the osmotic pressure π (coal chemical industrial waste water) of coal chemical industrial waste water before processing
First coal chemical industrial waste water before processing is carried out detection to analyze, calculate infiltration substance withdrawl syndrome therein (the ionic state amount of substance molecular state amount of substance sum in solution) (S1, with mol L-1Meter), adopt Fan Tuofu (van ' tHoff) formula calculate process before the osmotic pressure π (coal chemical industrial waste water) of coal chemical industrial waste water:
π (coal chemical industrial waste water)=cBRT≈S1RT
Wherein: π (coal chemical industrial waste water) is the osmotic pressure of coal chemical industrial waste water before processing；
For electrolyte solution, cBIt is the solute molecule that can produce osmotic effect in 1L solution and the total amount of substance of ion, c hereinB≈S1, it is called infiltration substance withdrawl syndrome；
R is gas constant；
T is absolute temperature.
In running, the infiltration substance withdrawl syndrome in FO films at different levels airtight commuting case mother solution district (or claiming concentration liquid zone) is by the approximate conversion of the waste water COD on-line computing model video data arranged on it；
2, the airtight commuting case of first order FO film draws the ion concentration J of liquid1
According to required permeable pressure head (△ π by whether is determined for actual demands such as generatings), adopt Fan Tuofu (van ' tHoff) formula π=cBRT calculates the required airtight commuting case of first order FO film and draws the ion concentration J of liquid1:
J1≈cB=π (draws liquid)/RT
π (draws liquid)=π (coal chemical industrial waste water)+△ π
π (coal chemical industrial waste water) ≈ S1RT
Wherein, π (draws liquid) for drawing the osmotic pressure of liquid, the osmotic pressure that π (coal chemical industrial waste water) is coal chemical industrial waste water；
For electrolyte solution, cBIt is the solute molecule that can produce osmotic effect in 1L solution and the total amount of substance of ion, c hereinB≈J1, it is called infiltration substance withdrawl syndrome；
R is ideal gas constant；
T is absolute temperature.
In running, the airtight commuting cases of FO film at different levels draw the infiltration substance withdrawl syndrome of liquid zone by the waste water ionometer video data approximate calculation arranged on it；
For improving efficiency, it is generally adopted and draws liquid close to saturated concentration.
3, the progression n (serial number) of the airtight commuting case of FO film
To draw the ion concentration J of liquid1Being example for drawing the saturated concentration of liquid solute under normal temperature and pressure conditions, its osmotic pressure is definite value π (drawing liquid)Saturated；
Due to the effect of agitator and circulating pump, with mother solution (or claiming concentrated solution) concentration of the airtight commuting case of one-level FO film with draw liquid concentration and may be considered homogeneous；
When system is properly functioning, along with the continuous concentration of mother solution (or claiming concentrated solution), the mother solution district infiltration substance withdrawl syndrome of the airtight commuting case of FO film not at the same level can be more and more higher, and Sn+1> Sn(SnBeing infiltration substance withdrawl syndrome in the mother solution of n-th grade of airtight commuting case of FO film, n is the progression of the airtight commuting case of FO film), itself and the permeable pressure head △ π drawing liquid also can be gradually reduced, and in theory, work as SnClose to the saturated concentration of mother solution solute, close to drawing liquid ion concentration J1 and equal to when drawing liquid ion concentration J1, the mother solution of FO film both sides and draw liquid and be absent from permeable pressure head △ π, the now greatest measure that progression is n of the airtight commuting case of FO film.
The reduction of permeable pressure head △ π can affect membrane flux and osmotic efficiency, the work of electromotor also can be affected during for generating electricity, for this, generally according to practical factors such as membrane flux, osmotic efficiency and generator impeller desirable pressure, comprehensively determine the progression n of the airtight commuting case of FO film.
4, the number i (quantity in parallel) of every grade of airtight commuting case of FO film
The number i of every grade of airtight commuting case of FO film is estimated by below equation:
I=Q/ (Q ' S).
Wherein: Q is wastewater treatment scale (m3·S-1)；
Q ' is FO membrane flux (m3·S-1·m-2)；
S is effective forward osmosis membrane area (m of the single airtight commuting case of FO film2)。
Determine above-mentioned important parameter, it is meant that determine the configuration of system.
Open water supply pipe 44, make addition tap water in molten medicine-chest 30, and (infiltration substance withdrawl syndrome is J to pour liquid drawing liquor in molten medicine-chest 300, J0> J1, market purchasing) or solid draw liquid solute powder (market purchasing), stirred by molten medicine agitator 31, preparation ion concentration is J1Draw liquid, by draw liquid ionometer 32 detection preparation draw liquid ion concentration.Open molten medicine outlet electric valve door 29, make to draw liquid stream and enter to draw liquid compensation box 27, then the liquid that draws opening the first order successively compensates electrically operated valve 42 and draws liquid compensation pump 41, make to draw liquid and be full of the airtight commuting case 2 of first order FO film, then close successively and draw liquid compensation pump 41, the liquid that draws of the first order compensates electrically operated valve 42, molten medicine outlet electric valve door 29 and molten medicine agitator 31, check simultaneously and determine that all the other electrically operated valves are in closed mode, each air bleeding valve is in opening, finally carries out the process preparation before system is run.
After above-mentioned job done, opening coal chemical industrial waste water water inlet electrically operated valve 1, coal chemical industrial waste water flows into the mother solution district of the airtight commuting case 2 of first order FO film, owing to the ion concentration (J of liquid zone is drawn in membrane component 6 side1) more than the infiltration substance withdrawl syndrome (S in mother solution district1) permeable pressure head (△ π) that formed, make the hydrone in mother solution district coal chemical industrial waste water freely reach through membrane component 6 and draw liquid zone, being closed structure owing to drawing liquid zone, what after dilution, volume increased draw, and liquid can pass through draws liquid and compensate pipe and enter and airtight draw liquid commuting case 13.Draw after liquid commuting case 13 is full of, close commuting case electric-powered air release valve 45.Drawing liquid generate electricity as utilized, then close commuting case and surmount pipe electrically operated valve 43, open rotor casing water inlet electrically operated valve 47, rare after dilution draws liquid, and (ion concentration is J1’,J1' < J1) enter airtight rotor casing 16, promote turbine wheel 17 to do work, export electric energy by turbine generation unit 18, rare after generating draws liquid and enters and draw liquid intermediate box 19.As without generating, then close rotor casing water inlet electrically operated valve 47, open commuting case surmount pipe electrically operated valve 43, make rare draw liquid enter draw liquid intermediate box 19, subsequently into drawing liquid multi-effect evaporator 21.By multi-effect evaporator 21, liquid solute (normally gaseous) and the separation of water (solvent) are drawn in realization, solute therein enters and draws liquid dissolving case 23, open and dissolve box mixer 24, dissolving case ionometer 25 is utilized to control solution concentration, it is achieved to draw the recycling and reuse of liquid solute；Unnecessary water enters filtered water tank 34, clarified water pump 35 be delivered to molten medicine-chest 30 or be back to plant area other is arranged with water, it is achieved the recycling of water resource.
Coal chemical industrial waste water after concentration enters the airtight commuting case of FO film of next stage step by step by discharge opeing electrically operated valve 37, by above-mentioned process flow operation.Every grade of airtight commuting case of FO film utilizes the temperature-adjusting device 9 bottom it, the temperature of conservative control coal chemical industrial waste water so that it is concentration reaches the saturated concentration at this temperature.Finally cannot reconcentration or as required without further concentrate (general COD is when more than 600000mg/L) mother solution enter mother solution incinerator 40 carry out burning disposal.
Claims (1)
1. an energy-conservation coal chemical industrial wastewater processing system, including forward osmosis membrane enrichment facility and mother solution incinerator, it is characterized in that: forward osmosis membrane enrichment facility includes the airtight commuting case of FO film, draw liquid recycle device and clean water recovery device, the airtight commuting case of FO film is at least provided with one-level, draw liquid recycle device to be connected respectively through electrically operated valve with the airtight commuting cases of FO film at different levels, clean water recovery device is connected with drawing liquid recycle device, the airtight commuting cases of FO film at different levels pass sequentially through discharge opeing electrically operated valve and connect, and be connected with mother solution incinerator each through surmounting pipe electrically operated valve；
The inside of the described airtight commuting case of FO film arranges membrane component, and membrane component will be divided into mother solution district and draws liquid zone inside airtight for FO film commuting case, the top in mother solution district is provided with water inlet pipe, this water inlet pipe is provided with into water electrically operated valve；In the airtight commuting case of upper level FO film, the bottom in mother solution district is connected with the top in mother solution district in the next stage airtight commuting case of FO film by discharge opeing electrically operated valve, and in every airtight commuting case of one-level FO film, the bottom in mother solution district is connected with mother solution incinerator each through surmounting pipe electrically operated valve simultaneously；Drawing the top of liquid zone in every airtight commuting case of one-level FO film and be connected with the liquid commuting case that draws drawing in liquid recycle device respectively through drawing liquid conveying pipe, the respective liquid that draws is carried to be provided with on pipe and is drawn liquid outlet electric valve door；Every airtight commuting case of one-level FO film draws the bottom of liquid zone be provided with and draw liquid and compensate electrically operated valve, and compensate pipe is connected by draw liquid between liquid compensation box with drawing drawing in liquid recycle device, draw liquid and compensate pipe is connected to and draw liquid compensation pump；
The described outside drawing liquid zone be provided with connect draw upper and lower, liquid zone draw liquid circulation pipe, draw liquid circulation pipe is provided with and draw liquid circulating pump.
The described liquid recycle device that draws includes drawing liquid commuting case, draws liquid intermediate box, draws liquid multi-effect evaporator, draws liquid dissolving case, draws liquid compensation box and molten medicine-chest, draw liquid commuting case top and be provided with commuting case electrically operated valve and commuting case electric-powered air release valve, and be connected with drawing liquid intermediate box by commuting case electrically operated valve；Draw the bottom of liquid commuting case surmount pipe electrically operated valve by commuting case and draw liquid intermediate box and be connected；Draw liquid intermediate box top and be provided with intermediate box electric-powered air release valve, draw liquid intermediate box and draw liquid multi-effect evaporator and be connected；Draw liquid dissolving case to be connected with drawing liquid multi-effect evaporator；The bottom drawing liquid compensation box is connected with the bottom drawing liquid dissolving case by compensation box import electrically operated valve；The bottom of molten medicine-chest is connected with the bottom drawing liquid compensation box by molten medicine outlet electric valve door；
First the infiltration substance withdrawl syndrome S of analytical calculation coal chemical industrial waste water1, show that the required airtight commuting case of first order FO film draws the infiltration substance withdrawl syndrome J of liquid according to required osmotic pressure1, J1More than S1, and draw the number i of the sum of series every grade airtight commuting case of FO film of the airtight commuting case of FO film of needs；Then pass through and draw liquid recycle device preparation ion concentration J1Draw liquid, make to draw liquid and be full of the airtight commuting case of first order FO film；Open coal chemical industrial waste water water inlet electrically operated valve, coal chemical industrial waste water flows in the airtight commuting case of first order FO film, exchange with drawing liquid, make the hydrone in coal chemical industrial waste water freely reach and draw liquid, after dilution, the liquid that draws of volume increase realizes drawing the separation of liquid solute and water by the multi-effect evaporator drawing in liquid recycle device, realizing drawing the recycling and reuse of liquid solute, unnecessary water enters clean water device, it is achieved the recycling of water resource；Coal chemical industrial waste water is concentrated by the airtight commuting case of FO film step by step, finally cannot reconcentration or enter mother solution incinerator without the mother solution that concentrates further as required and carry out burning disposal.
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| CN104326616B (en) * | 2014-11-28 | 2016-07-20 | 山东省环科院环境工程有限公司 | A kind of energy-conservation Fine Chemistry Wastewater advanced treatment system and processing method thereof |
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| CN107055693B (en) * | 2016-11-11 | 2019-06-14 | 张英华 | Positive osmosis industry sewage disposal device and positive osmosis industry sewage water treatment method |
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