CN207811478U - A kind of gas field wastewater desulfurization desalting processing system containing surfactant - Google Patents

Abstract

A kind of gas field wastewater desulfurization desalting processing system containing surfactant,It can be to integrate the technology continuous processing gas field wastewater of low energy consumption operation,Pretreatment unit is filtered including sequentially connected coagulation air-float,Mesoporous media absorbing unit,Evaporative crystallization unit and oxidation unit,The evaporative crystallization unit includes heater,Vapour liquid separator,Detach crystallizer and compressor,The heater has reuse steam inlet and the 11st processing water out,The reuse steam inlet connect the compressor by compression reuse steam (vapor) outlet,The compressor connects the reuse steam (vapor) outlet of the vapour liquid separator,The 11st processing water out connects the vapour liquid separator,The vapour liquid separator has separation liquid outlet,First evaporative condenser water out and Recycling Mother Solution entrance,The separation liquid outlet connects the separation crystallizer,The separation crystallizer has solid salt outlet and Recycling Mother Solution outlet,The Recycling Mother Solution outlet connects the Recycling Mother Solution entrance.

Description

A kind of gas field wastewater desulfurization desalting processing system containing surfactant

Technical field

The further treatment technique of gas field recovered water, that is, gas field wastewater in being developed the present invention relates to natural gas field, especially one Gas field wastewater desulfurization desalting processing system and method for the kind containing surfactant, can be to integrate the supporting technology of low energy consumption operation Comprehensive processing continuously is carried out to gas field wastewater, is conducive to the environmental protection in gas field development region, reduces or eliminates gas field extraction Pollution of the water to environment.

Background technology

Gas field recovered water is the water flooding being plucked out of with gas production operation to ground.Since the pressure of gas reservoir in exploitation is continuous It reduces, underground water, crude oil, mud gradually invade gas reservoir, and as natural gas is plucked out of together, form gas field recovered water.Gas field Recovered water, that is, gas field wastewater, waste water point source because of gas well are counted mostly and are disperseed.The water of gas field recovered water is with mining time Increase and increase, the constituent of water quality is complicated and changeable due to gas production region difference.Generally speaking, gas field wastewater has chemistry Complicated components, high salinity, highly corrosive, contain oily substance, are high high and biochemical containing surfactant, COD concentration high concentrtion The features such as property is poor, meanwhile, contain the organic pollutions such as aldehydes, alcohols, phenols and sulfide and heavy metal substance.Since gas field is adopted Water outlet exists and is mutually coexisted for a long time with natural gas in the earth formation, so still remaining multiple-microorganism perhaps and thin in waste water Bacterium.

Gas field recovered water can consume a large amount of dissolved oxygen in water after being discharged into surface water body, lead to the biochemical oxygen demand (BOD) in water body It increased dramatically, water body blackening can be made to foul, cause seriously to pollute.The inventors discovered that gas field wastewater is a kind of high containing surface work Property agent waste water, contained by a large amount of foaming agents be difficult to degrade in existing environment, have chronic toxic action, water body can be made Growth stage pollutes.Sulfide in gas field wastewater and heavy metal substance can make the harmful metal elements content in surface deposit Increase, there is certain toxic effect to the biology in water body.A large amount of suspended matters contained by gas field wastewater are easy to cause water body muddy, Influence the photosynthesis of water plant.Different kinds of petroleum hydrocarbon contained in gas field wastewater is the object of " carcinogenic, mutagenesis, teratogenesis " Matter is difficult to natural degradation after being discharged into water body, can be enriched in the aquatic animals and plants body such as shellfish, fish, algae, and pass through food chain Human body is damaged.Meanwhile gas field wastewater is high-chloride wastewater, the salinization of soil it is former to be changed soil by a large amount of chlorions Some physico-chemical properties influence the growing environment of plant.Oil pollution substance such as phenol, benezene material in gas field wastewater etc. can draw The symptoms such as dizziness, nausea, headache are played, tremendous influence is generated to health, brings serious harm.As the construction of natural gas fields is advised The gradual of continuous expansion and the construction of natural gas fields work of mould gos deep into, and the water of gas field recovered water also gradually increases, especially The extensive application of the medicaments such as various foaming agents, corrosion inhibiter, hydrate inhibitor, antifoaming agent causes the water quality of gas field wastewater to form It becomes increasingly complex, difficulty of governance is also increasing.Therefore, Natural Gas Enterprises are providing the same of a large amount of industrial chemicals and clean fuel When also bring severe problem of environmental pollution.Inventors believe that, if it is possible to integrate the supporting technology of low energy consumption operation Comprehensive processing continuously is carried out to gas field wastewater, for example, desalination desulfurization, sterilization, degradation of organic substances etc., then can be changed to give up and be Treasured, making that treated, gas field wastewater becomes beneficial available water, for example, be system circulation cooling water by its reuse, in gas field its His industrial water or green area irrigation water etc..In view of this, the present inventor completes the present invention.

Invention content

The present invention is in view of the deficiencies in the prior art or insufficient, and it is de- to provide a kind of gas field wastewater containing surfactant Sulphur desalting processing system and method continuously can carry out comprehensive place with the supporting technology for integrating low energy consumption operation to gas field wastewater Reason, is conducive to the environmental protection in gas field development region, reduces or eliminates pollution of the gas field recovered water to environment.

Technical scheme is as follows：

A kind of gas field wastewater desulfurization desalting processing system containing surfactant, which is characterized in that including sequentially connected Coagulation air-float filters pretreatment unit, Mesoporous media absorbing unit, evaporative crystallization unit and oxidation unit, the coagulation air-float mistake Pretreatment unit is filtered with gas field wastewater entrance, the oxidation unit includes with water purification water outlet, the evaporative crystallization unit Heater, vapour liquid separator, separation crystallizer and compressor, the heater have reuse steam inlet and the 11st processing water Outlet, the reuse steam inlet connect the compressor by compression reuse steam (vapor) outlet, the compressor connects the vapour The reuse steam (vapor) outlet of liquid/gas separator, the 11st processing water out connect the vapour liquid separator, the vapour liquid separator With separation liquid outlet, the first evaporative condenser water out and Recycling Mother Solution entrance, described point of the separation liquid outlet connection From crystallizer, there is the separation crystallizer solid salt outlet and Recycling Mother Solution outlet, the Recycling Mother Solution outlet to connect the mother Liquid loop head.

The reuse steam is inhaled into the compressor by compressing to form described pressed after being pressurized and being heated up Retraction steam, it is described by compression reuse steam by the reuse steam inlet enter the heater substitute start heating when Primary steam after formed reuse steam circulation, it is no longer necessary to primary steam.

The solid salt outlet connection sludge storage tank.

Tenth processing water out of the heater connection preheater, the preheater connect first evaporation condensed water Outlet, the preheater have the second evaporative condenser water out, and the second evaporative condenser water out connects condenser, described cold Condenser connects condensate water pot by the water out that is condensed, and the condensate water pot connects oxidation unit by condensation-water drain.

The oxidation unit is ozone catalytic oxidation unit.

The Mesoporous media absorbing unit includes pre-coating film diatomaceous earth filter, active carbon adsorption filter and the second buffering There is backwash water out and the 7th processing water out, the 7th processing water out to connect for tank, the pre-coating film diatomaceous earth filter The active carbon adsorption filter is connect, the active carbon adsorption filter has backwash water out and the 8th processing water out, institute It states the 8th processing water out and connects second surge tank, there is second surge tank sludge outlet and the 9th processing water to go out Mouthful, the 9th processing water out connects preheater, on the pipeline between the preheater and the 9th processing water out It is provided with antisludging agent adding set, ammonia nitrogen removal agent adding set, the dirt of second surge tank are provided on the preheater Mud outlet connection sludge storage tank.

The coagulation air-float filtering pretreatment unit includes oil separator, adjusts storage tank, first order air-floating apparatus, second level air supporting Device, the first surge tank and more medium filter, the oil separator have gas field wastewater entrance, sludge outlet, backwash water inlet With the first processing water out, the first processing water out connects the tune storage tank, and the tunes storage tank is with sludge outlet and the Two processing water outs, the second processing water out connect the first order air-floating apparatus, and the first order air-floating apparatus has Sludge outlet and third handle water out, and the third processing water out connects the second level air-floating apparatus, the second level There is air-floating apparatus sludge outlet and fourth process water out, the fourth process water out to connect first surge tank, institute The first surge tank is stated with sludge outlet and the 5th processing water out, the 5th processing water out connects the multi-medium filtering Device, the more medium filter have backwash water out and the 6th processing water out, and the described 6th is handled described in water out connection Mesoporous media absorbing unit.

The second processing water out for adjusting storage tank is provided with on the connecting line of the first order air-floating apparatus Fenton reagent adding set, the first order air-floating apparatus upper edge water (flow) direction are disposed with adsorbent adding set, mix Solidifying agent adding set and flocculation aid adding set.

A kind of gas field wastewater desulfurization desalting processing method containing surfactant, which is characterized in that including passing through following step Suddenly the gas field wastewater containing surfactant is handled：Step 1 is coagulation air-float filtering pretreatment, and step 2 is Mesoporous media Adsorption treatment, step 3 are evaporative crystallization processing, and step 4 is oxidation processes, and the oxidation processes are catalytic ozonation processing, The evaporative crystallization processing includes that preheating, heating, vapor-liquid separation, separation crystallization, condensation and the compression of reuse steam are pressurized heating, The reuse steam is formed in the vapor-liquid separation, and the reuse steam is inhaled into compressor and is pressurized by compressing With formation after heating by compression reuse steam, the initial steaming entered by compression reuse steam when heater substitutes startup heating Reuse steam circulation is formed after vapour, it is no longer necessary to primary steam；Waste water carries out vapor-liquid separation, the crystalline substance of precipitation in vapour liquid separator Grain suspends in a liquid makees fluidization campaign, and small crystal grain is gradually increasing, and is discharged from top with liquid, sucks and recycle through pipeline Pump, is again introduced into heater and carries out heating concentration；Big crystal gradually sinks, and is discharged into separation crystallizer by discharging pump, It is collected into crystal after being centrifuged and consolidates salt, remaining mother liquor comes back to evaporative crystallization in vapour liquid separator；Vapour liquid separator The generation condensation water collection of middle generation enters condensate water pot；Condensed water is by the catalytic ozonation in the condensate water pot Become water purification after reason.

The Mesoporous media adsorption treatment includes pre-coating film diatomite filtration treatment and active carbon adsorption filtration treatment, described Coagulation air-float filtering pretreatment uses oil removal, air supporting and multi-medium filtering technique.

The technique effect of the present invention is as follows：The present invention was adsorbed by using coagulation air-float filtering pretreatment, Mesoporous media Filter processing, evaporative crystallization processing, i.e. four cell process of catalytic ozonation processing it is integrated, form and a kind of being directed to natural gas The desulfurization desalination depth comprehensive processing technique of gas field wastewater of the gas field height containing surfactant, the technique have high treating effect and Stable, easy to operate, MVR (mechanical vapor recompression) evaporator floor space is small, and required space is small, The features such as comprehensive energy consumption is low, cost of water treatment is low, the technique are especially suitable for water supply capacity deficiency, the gas field wastewater that the space is insufficient Standard discharge processing.

A kind of gas field wastewater desulfurization desalting processing system and method containing surfactant of the present invention, can make gas field wastewater Treated that effluent quality reaches by whole《Integrated wastewater is discharged into standard》(GB8978-1996) primary standard,《Industrial cycle Cold water process design specification》(GB50050-2007)、《Agricultural irrigation water quality standard》(GB5084-2005).After water quality reaching standard Can reuse be system circulation cooling water, other industrial waters or greening, irrigation in gas field, pollutant is in the form of crystal salt from dirt It is precipitated in water, crystal salt carries out landfill stabilization or recycling.

Gas field wastewater by oil separator enter coagulation air-float filter pretreating process unit, go water removal in oil slick, part After suspended matter, partial organic substances and sulfide, Mesoporous media is lifted by pump and absorbs and filter unit, this element handle water by into Material pump enters evaporative crystallization unit, and this element outlet condensed water is promoted by pumping into surge tank, then is lifted into advanced oxidation by pump Unit, water reuse up to standard is system circulation cooling water, other industrial waters or greening, irrigation in gas field, and pollutant is with crystal salt Form be precipitated from sewage, crystal salt carries out landfill disposal or recycling；By coagulation air-float filtering pretreatment unit, evaporation The sludge that crystalline element generates is promoted to sludge concentration tank by pump, after carrying out gravity concentration and mechanical dehydration, to dewatered sludge Carry out landfill or burning disposal.

The pretreating process of gas field wastewater filters pretreating process using coagulation air-float.The unit includes oil separator, adjusts storage Tank, level-one air supporting, secondary air-floatation, surge tank, more medium filter, play homogeneous, oil removing, removal of impurities, except part surface activating agent, The effect of sulphide removal.This unit oil removal rate 90%, COD (Chemical Oxygen Demand) removal rate 30%~ 50%, removal of impurity 95%, removal of surfactant rate 25~45%, desulphurizing ratio 99.9%.The sludge that this unit generates is logical It crosses pump and is promoted to sludge concentration tank, after carrying out gravity concentration and mechanical dehydration, landfill or burning disposal are carried out to dewatered sludge.

The removal design of the organic steams such as high surfactant, phenols is single using Mesoporous media adsorption filtration in gas field wastewater Member.Mesoporous media absorbing unit is made of two adsorbent equipments, when pre-coating film kieselguhr adsorption filter, second is that coconut activated Carbon adsorption filter.This unit COD removal rates 60%~80%, removal of surfactant rate 90%.

Desalination in gas field wastewater uses MVR (mechanical vapor recompression) evaporative crystallization technique. The technology is will to be delivered to by feed pump after preheater preheated by Mesoporous media absorbing unit treated gas field wastewater Into heater, evaporation is detached into vapour liquid separator with after heating steam heat-exchanging in tube side, separating obtained indirect steam by Indirect steam pipeline is sucked heat pump compression set by force at the top of second-stage separator, compressed, and pressure, temperature increase, and heat content increases Add, reenters heating device and gas field wastewater is heated.Package unit low-temperature evaporation under condition of negative pressure.It is deposited in liquid crystal The brine waste magma of separator bottom is transported to crystal separator, and after being centrifuged, the solid salt of separation collects outer row, centrifugation Mother liquor afterwards reenters the concentration of evaporation and crystallization system evaporative crystallization.In surface condenser not condensable gas in the form of water vapour It separates, enters air through vacuum pumped heel row.Enter advanced oxidation unit after the condensation water collection evaporated.

Organic matter difficult to degrade design uses advanced oxidation unit in waste water.This unit uses the advanced oxygen of catalytic ozonation Change technology, using the high oxidation-reduction potential of the OH free radicals of ozone decomposed generation and to the progress of organic matter non-selectivity Redox reaction removes COD.

In country and environmental protection administration to gas water water standard and management further normalization, and require increasingly tighter feelings Under condition, there is an urgent need to explore the new technology for administering gas water, sustainable development is realized, for this purpose, the present invention provides complete effective A kind of series technique solution, that is, gas field wastewater desulfurization desalting processing system and method containing surfactant.

Description of the drawings

Fig. 1 is to implement a kind of gas field wastewater desulfurization desalting processing system structure diagram containing surfactant of the present invention.

Reference numeral lists as follows：1- gas field wastewater entrances；2- oil separators；3- first handles water out；4- sludge outlets； 5- backwash water inlets；6- tune storage tanks；7- second processing water outs；8-Fenton reagents adding set (hydrogen peroxide and catalyst The oxidation system that Fe2+ is constituted is commonly referred to as Fenton reagent)；9- adsorbent adding sets；10- coagulant adding sets； 11- Flocculation aid adding set；12- first order air-floating apparatus；13- thirds handle water out；The second level 14- air-floating apparatus；15- the 4th Handle water out；The first surge tanks of 16-；17- the 5th handles water out；18- more medium filters；19- backwash water outs；20- 6th processing water out；21- coagulation air-floats filter pretreatment unit；22- Mesoporous media absorbing units；23- pre-coating film diatomite Filter；24- the 7th handles water out；25- active carbon adsorption filters；26- the 8th handles water out；27- second is buffered Tank；28- the 9th handles water out；29- evaporative crystallization units；30- antisludging agent adding sets；31- preheaters；32- ammonia nitrogen removals Agent adding set；33- the second evaporative condenser water outs；34- the tenth handles water out；35- heaters；36- reuse steam enters Mouthful；37- the 11st handles water out；38- vapour liquid separators；39- the first evaporative condenser water outs；40- Recycling Mother Solution entrances； 41- reuse steam (vapor) outlets；42- detaches liquid outlet；43- detaches crystallizer；44- Recycling Mother Solutions export；45- consolidates salt outlet； 46- compressors；47- is by compression reuse steam (vapor) outlet；48- condensers；49- is condensed water out；50- condensate water pots；51- is cold Condensate exports；52- oxidation units；53- water purification water outlets；54- sludge storage tanks.

Specific implementation mode

Below in conjunction with the accompanying drawings (Fig. 1) and examples illustrate the present invention.

Fig. 1 is to implement a kind of gas field wastewater desulfurization desalting processing system structure diagram containing surfactant of the present invention. As shown in Fig. 1, a kind of gas field wastewater desulfurization desalting processing system containing surfactant, including sequentially connected coagulation air-float Filter pretreatment unit 21, Mesoporous media absorbing unit 22, evaporative crystallization unit 29 and oxidation unit 52, the coagulation air-float mistake Filtering pretreatment unit 21, there is gas field wastewater entrance 1, the oxidation unit 52 to have water purification water outlet 53, the evaporative crystallization list Member 29 includes heater 35, vapour liquid separator 38, separation crystallizer 43 and compressor 46, and the heater 35 has reuse steam Entrance 36 and the 11st handle water out 37, the reuse steam inlet 36 connect the compressor 46 by compression reuse steam Outlet 47, the compressor 46 connect the reuse steam (vapor) outlet 41 of the vapour liquid separator 38, the 11st processing water out The 37 connection vapour liquid separators 38, the vapour liquid separator 38 have separation liquid outlet 42, the first evaporative condenser water out 39 and Recycling Mother Solution entrance 40, the separation liquid outlet 42 connects the separation crystallizer 43, and the separation crystallizer 43 has There are solid salt outlet 45 and Recycling Mother Solution outlet 44, the Recycling Mother Solution outlet 44 to connect the Recycling Mother Solution entrance 40.Described time It is described by compression reuse steam, institute to be formed after being pressurized and being heated up to be inhaled into the compressor 46 by compressing with steam It states and the initial steaming started when heating is substituted into the heater 35 by the reuse steam inlet 36 by compression reuse steam Reuse steam circulation is formed after vapour, it is no longer necessary to primary steam.The 45 connection sludge storage tank 54 of solid salt outlet.

The heater 35 connects the tenth processing water out 34 of preheater 31, and the preheater 31 connects described first and steams Condensation-water drain 39 is sent out, the preheater 31 has the second evaporative condenser water out 33, the second evaporative condenser water out 33 Condenser 48 is connected, the condenser 48 connects condensate water pot 50 by the water out 49 that is condensed, and the condensate water pot 50 passes through Condensation-water drain 51 connects oxidation unit 52.The oxidation unit 52 is ozone catalytic oxidation unit.The Mesoporous media absorption Unit 22 includes pre-coating film diatomaceous earth filter 23, active carbon adsorption filter 25 and the second surge tank 27, the pre-coating film silicon There is diatomaceous earth filter 23 backwash water out 19 and the 7th to handle water out 24, and the 7th processing water out 24 connects described There is backwash water out 19 and the 8th to handle water out 26 for active carbon adsorption filter 25, the active carbon adsorption filter 25, The 8th processing water out 26 connects second surge tank 27, and second surge tank 27 has sludge outlet 4 and the 9th Water out 28 is handled, the 9th processing water out 28 connects preheater 31, and water is handled in the preheater 31 and the described 9th It is provided with antisludging agent adding set 30 on pipeline between outlet 28, ammonia nitrogen removal agent addition dress is provided on the preheater 31 32 are set, the sludge outlet 4 of second surge tank 27 connects sludge storage tank 54.

The coagulation air-float filtering pretreatment unit 21 includes oil separator 2, adjusts storage tank 6, first order air-floating apparatus 12, second There is gas field wastewater entrance 1, sludge to go out for grade air-floating apparatus 14, the first surge tank 16 and more medium filter 18, the oil separator 2 Mouth 4, backwash water inlet 5 and first handle water out 3, and the first processing water out 3 connects the tune storage tank 6, the tune storage There is tank 6 sludge outlet 4 and second processing water out 7, the second processing water out 7 to connect the first order air-floating apparatus 12, the first order air-floating apparatus 12 has sludge outlet 4 and third handles water out 13, and the third processing water out 13 connects The second level air-floating apparatus 14 is connect, the second level air-floating apparatus 14 has sludge outlet 4 and fourth process water out 15, institute It states fourth process water out 15 and connects first surge tank 16, first surge tank 16 has at sludge outlet 4 and the 5th Water out 17 is managed, the 5th processing water out 17 connects the more medium filter 18, and the more medium filter 18 has Backwash water out 19 and the 6th handles water out 20, and the 6th processing water out 20 connects the Mesoporous media absorbing unit 22.It is provided with Fenton on the connecting line of the second processing water out 7 for adjusting storage tank 6 and the first order air-floating apparatus 12 Reagent adding set 8,12 upper edge water (flow) direction of the first order air-floating apparatus are disposed with adsorbent adding set 9, coagulation Agent adding set 10 and flocculation aid adding set 11.

A kind of gas field wastewater desulfurization desalting processing method containing surfactant, including lived by following steps to containing surface The gas field wastewater of property agent is handled：Step 1 is coagulation air-float filtering pretreatment, and step 2 is Mesoporous media adsorption treatment, step 3 are handled for evaporative crystallization, and step 4 is oxidation processes, and the oxidation processes are catalytic ozonation processing, the evaporative crystallization Processing includes preheating, heating, vapor-liquid separation, separation crystallization, condensation and the compression of reuse steam supercharging heating, the reuse steam It is formed in the vapor-liquid separation, the reuse steam is inhaled into compressor by compressing to be formed after being pressurized and being heated up By compression reuse steam, it is described entered after heater substitutes primary steam when starting heating by compression reuse steam form reuse Steam circulation, it is no longer necessary to primary steam；Waste water carries out vapor-liquid separation in vapour liquid separator, and the crystal grain of precipitation hangs in a liquid Floating to make fluidization campaign, small crystal grain is gradually increasing, and is discharged from top with liquid, is sucked circulating pump through pipeline, be again introduced into and add Hot device carries out heating concentration；Big crystal gradually sinks, and is discharged into separation crystallizer by discharging pump, is received after being centrifuged Collect crystal and consolidate salt, remaining mother liquor comes back to evaporative crystallization in vapour liquid separator；The generation generated in vapour liquid separator is cold Condensed water collection enters condensate water pot；Condensed water becomes water purification after catalytic ozonation processing in the condensate water pot. The Mesoporous media adsorption treatment includes pre-coating film diatomite filtration treatment and active carbon adsorption filtration treatment, the coagulation air-float Filtering pretreatment uses oil removal, air supporting and multi-medium filtering technique.

The present invention solves the problems, such as a kind of high gas containing surfactant the technical solution adopted is that natural gas field exploitation Field waste water desulfurization desalination advanced treatment process, including steps are as follows：Gas water sequentially enters coagulation air-float filtering pretreatment unit- Mesoporous media absorbing unit-evaporation element-advanced oxidation unit.

(1) coagulation air-float filters pretreatment unit：Pretreating process filters pretreating process using coagulation air-float.Specifically adopt With the technique of " adjusting storage buffering+secondary air-floatation+level-one fine filtering ".By oily removal rate 90% in the gas field wastewater of the unit, COD removal rates 30%~50%, removal of impurity 95%, removal of surfactant rate 25%~45%, desulfurization degree 99.9%. The sludge that this unit generates is promoted to sludge concentrating pot by pump, after carrying out gravity concentration and mechanical dehydration, to dewatered sludge into Row landfill or burning disposal.Backwash water enters oil separator.

(2) Mesoporous media absorbs and filter unit：This technique is to the high surfactant in gas field wastewater, phenols, alcohols etc. The removal design of organic steam absorbs and filter unit using Mesoporous media.Coagulation air-float filters pretreatment unit water outlet and is promoted by pump Unit is absorbed and filter into Mesoporous media, a large amount of surfactant and phenols, the organic steams such as alcohols, surface in water is removed and lives Removal rate 90%, the COD removal rates 60~80% of property agent

(3) evaporation element：This technique steams removing design with high salt in gas field wastewater of the height containing surfactant using MVR Send out crystallization technique.Mesoporous media adsorption filtration unit water outlet is pumped into evaporative crystallization unit by feed pump, and this element exports condensed water It is promoted into condensate water pot by pump, pollutant is precipitated in the form of crystal salt from sewage, and crystal salt carries out landfill disposal or recycling It utilizes.

(4) advanced oxidation unit：Catalytic ozonation high-level oxidation technology is used to organic matter difficult to degrade in gas water. Evaporation element outlet condensed water is lifted into catalytic ozonation advanced oxidation unit by pumping.Catalytic ozonation oxidation not only has Good quick sterilization, disinfection property, and with the high organic ability with inorganic compound of oxidation, remove difficult drop in water The organic matter of solution reduces COD.

A kind of a kind of high gas field wastewater desulfurization desalination advanced treating containing surfactant for natural gas field exploitation Technique comprises the following specific steps that：

Step 1: coagulation air-float filters：Gas field wastewater enters tune storage tank by oil separator, and natural quiescent settling is gone in water removal Oil slick, partial suspended thing, partial organic substances, while playing the role of homogeneous water, Fonton be then added into waste water first Reagent, then be sequentially added into adsorbent, coagulant and flocculation aid and be lifted into an airfloat equipment, secondary air-floatation equipment successively, Air supporting water outlet enters surge tank, is then lifted out into more medium filter, removes oil slick, fine suspension, colloid, part in water Surfactant and sulfide.The backwash water of filter enters oil separator.Sludge, the dross of secondary air-floatation in tune storage tank, dirt Mud is collected to sludge concentrating pot, and after carrying out gravity concentration and mechanical dehydration, landfill or burning disposal are carried out to dewatered sludge.Air supporting Operation principle：Air can be soluble in water under a certain pressure and be in saturation state, then makes pressure drop in water, the air of dissolving It is precipitated from water with small bubble, so that it is adhered to close to the solia particle of water with grain size in sewage, reach miscellaneous in water removal The purpose of matter.

Step 2: Mesoporous media absorbs and filter：This technique is residual in pretreated gas field wastewater to being filtered by coagulation air-float The design of the organic matters such as surfactant, phenols, the aldehydes deposited uses Mesoporous media adsorption filtration technique.The design principle of the unit The microcellular structure for mainly relying on mesoporous material highly developed and big specific surface area absorption surface activity and organic substance are to reach To the purpose of removal.Pre-coating film diatomaceous earth filter operation principle：One layer of diatomite filter membrane is coated in cartridge surface first, is utilized The absorption of filter membrane and interception performance, further to reach control oil-containing, suspended matter purpose.As filter membrane adsorbs the pollution with interception The amount of object is continuously increased, and filtration pressure difference also becomes larger therewith, reversely empty using compressed air when filtration pressure difference is more than 1.5bar Quick-fried effect, diatomite filter membrane, blowback is got off from filter core, then with purification sewage backwash filter core, is then coated on filter core again Filter membrane, Reusability.Its diatomaceous grain size is 200mash, and it is 0.8Kg that every square metre plus soil, which are measured, forms filter membrane, filter membrane is with 3- The filtering velocity of 5m/h is filtered sewage.

Step 3: evaporative crystallization：The desalination of high saliferous gas field wastewater uses MVR evaporative crystallization techniques.90 DEG C of evaporating temperature, Compressor temperature rises 16 DEG C.The operation principle of MVR evaporative crystallizations：Material is existed in a falling film evaporator by Matter Transfer pump Cycle in heating tube.Primary steam live steam outside pipe to heat, by solution ebuillition of heated generate indirect steam, the two of generation Secondary steam is sucked by turbine boosted fan, and after supercharging, indirect steam temperature improves, and enters heating room cycle as heat source Evaporation.MVR evaporative crystallization techniques are heated using electric energy heating instead of steam, and low power consumption, the indirect steam for evaporating generation are pressed It contracts and is fully utilized, the output thermal energy of each concentrate of condensed water and stoste are carried out heat by steam almost free of losses in system It exchanges, fixed gas exchanges heat with stoste, and compressor electric motor uses rotating speed frequency control, thus compact with evaporation equipment, accounts for The characteristics of ground area is small, required space is also small, and low energy consumption.Specific working mode：Vaporising device by preheating device, heating device, Vapour liquid separator, separation crystallizer, five part of condenser composition.By suitable in waste water after Mesoporous media adsorption filtration cell processing After antisludging agent, ammonia nitrogen removal agent is added in sequence, enter heater after preheated, according to specific flow velocity and steam under the action of pump Heat exchange is carried out, waste water carries out vapor-liquid separation in vapour liquid separator, and the crystal grain of precipitation suspends in a liquid makees fluidization campaign, Small crystal grain is gradually increasing, with liquid from top be discharged, through pipeline suck circulating pump, be again introduced into heater heat it is dense Contracting；Big crystal gradually sinks, and is discharged into separation crystallizer by discharging pump, and most crystalline substance is collected into after being centrifuged Gu body-salt generates a small amount of mother liquor and comes back to vapo(u)rization system evaporative crystallization；The steam of generation is inhaled by turbo-compressor Enter, after supercharging improves temperature, enters heater circulating and evaporating as heat source.It generates condensation water collection and enters condensed water Tank.

Step 4：Advanced oxidation：This technique is degraded organic matter difficult to degrade using heterogeneous catalytic ozonation.Utilize work Property carbon as carrier, transition-metals and their oxides in load, ozone under the effect of the catalyst, produces OH, and oxidation is also Former current potential is up to 2.80V, and OH free radicals make organic matter rapid oxidation be decomposed into CO as secondary oxidation agent₂And H₂O and its He is discharged COD20~40mg/L by nontoxic small molecule acid to reduce the COD of gas water.

It is hereby stated that described above contribute to those skilled in the art understand that the invention, but not limit the present invention The protection domain of creation.It is any that equivalent replacement described above, modification are improved without disengaging the invention substantive content And/or delete numerous conform to the principle of simplicity and the implementation that carries out, each fall within the protection domain of the invention.

Claims (8)

1. a kind of gas field wastewater desulfurization desalting processing system containing surfactant, which is characterized in that including sequentially connected mixed Solidifying air-float filtration pretreatment unit, Mesoporous media absorbing unit, evaporative crystallization unit and oxidation unit, the coagulation air-float filtering Pretreatment unit has gas field wastewater entrance, and it includes adding that the oxidation unit, which has water purification water outlet, the evaporative crystallization unit, There is reuse steam inlet and the 11st processing water to go out for hot device, vapour liquid separator, separation crystallizer and compressor, the heater Mouthful, the reuse steam inlet connect the compressor by compression reuse steam (vapor) outlet, the compressor connects the vapour-liquid The reuse steam (vapor) outlet of separator, the 11st processing water out connect the vapour liquid separator, the vapor-liquid separation utensil There are separation liquid outlet, the first evaporative condenser water out and Recycling Mother Solution entrance, the separation liquid outlet to connect the separation There is solid salt outlet and Recycling Mother Solution outlet, the Recycling Mother Solution outlet to connect the mother liquor for crystallizer, the separation crystallizer Loop head.

2. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute Stating reuse steam, to be inhaled into the compressor by compressing described by compression reuse steam to be formed after being pressurized and being heated up, The primary steam entered by the reuse steam inlet by compression reuse steam when the heater substitutes startup heating Reuse steam circulation is formed afterwards, it is no longer necessary to primary steam.

3. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute State solid salt outlet connection sludge storage tank.

4. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute The tenth processing water out of heater connection preheater is stated, the preheater connects the first evaporative condenser water out, described There is preheater the second evaporative condenser water out, the second evaporative condenser water out to connect condenser, and the condenser passes through The water out that is condensed connects condensate water pot, and the condensate water pot connects oxidation unit by condensation-water drain.

5. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute It is ozone catalytic oxidation unit to state oxidation unit.

6. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute It includes pre-coating film diatomaceous earth filter, active carbon adsorption filter and the second surge tank to state Mesoporous media absorbing unit, described pre- There is film diatomaceous earth filter backwash water out and the 7th processing water out, the 7th processing water out to connect the activity Carbon adsorption filter, the active carbon adsorption filter have backwash water out and the 8th processing water out, the 8th processing Water out connects second surge tank, and second surge tank has a sludge outlet and the 9th processing water out, and the described 9th It handles water out and connects preheater, antisludging agent is provided on the pipeline between the preheater and the 9th processing water out Adding set, ammonia nitrogen removal agent adding set is provided on the preheater, and the sludge outlet connection of second surge tank is dirty Mud storage tank.

7. the gas field wastewater desulfurization desalting processing system according to claim 1 containing surfactant, which is characterized in that institute Coagulation air-float filtering pretreatment unit is stated to include oil separator, adjust storage tank, first order air-floating apparatus, second level air-floating apparatus, first Surge tank and more medium filter, the oil separator have gas field wastewater entrance, sludge outlet, backwash water inlet and the first processing Water out, the first processing water out connect the tune storage tank, and there is the tune storage tank sludge outlet and second processing water to go out Mouthful, the second processing water out connects the first order air-floating apparatus, the first order air-floating apparatus have sludge outlet and Third handles water out, and the third processing water out connects the second level air-floating apparatus, the second level air-floating apparatus tool There are sludge outlet and fourth process water out, the fourth process water out to connect first surge tank, first buffering Tank has sludge outlet and the 5th processing water out, and the 5th processing water out connects the more medium filter, described more There is medium filter backwash water out and the 6th processing water out, the 6th processing water out to connect the Mesoporous media and inhale Coupon member.

8. the gas field wastewater desulfurization desalting processing system according to claim 7 containing surfactant, which is characterized in that institute It states and is provided with Fenton reagent addition on the connecting line of the second processing water out with the first order air-floating apparatus of adjusting storage tank Device, the first order air-floating apparatus upper edge water (flow) direction be disposed with adsorbent adding set, coagulant adding set and Flocculation aid adding set.