CN109928563A - A kind of shale gas well-drilling waste water processing method - Google Patents
A kind of shale gas well-drilling waste water processing method Download PDFInfo
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Abstract
The present invention provides a kind of shale gas well-drilling waste water processing methods, include the following steps, S1: well-drilling waste water pH being adjusted to 8~11, coagulant and flocculation aid is added, staticly settles, is then separated by solid-liquid separation after mixing evenly；S2: S1 is separated by solid-liquid separation the clear liquid pH obtained and is adjusted to 2~5, hydrogen peroxide and Fe/C filler is added, and be pumped into 1.5~2h of air reaction；S3: by S2, treated that wastewater pH is adjusted to 9~11, and chemical precipitation agent is added, temperature is controlled at 80 DEG C, stirs evenly and reacts 20~40min, be then separated by solid-liquid separation；S4: the clear liquid pH for being separated by solid-liquid separation acquisition in S3 is adjusted to 7~9, ammonia nitrogen removal agent is added, reacts 20~30min；S5: the processing of cryogenic vacuum evaporation is carried out to S4 treated waste water, obtains condensed water and concentrate.The present invention successively carries out coagulating sedimentation to shale gas well-drilling waste water, Fenton oxidation-light electrolysis, chemical precipitation, removes ammonia nitrogen and four-effect evaporation processing, and conventional index can reach the primary standard of integrated wastewater discharge standard in well-drilling waste water after processing.
Description
Technical field
The invention belongs to well-drilling waste water processing technology fields, and in particular to a kind of shale gas well-drilling waste water processing method.
Background technique
Shale gas well-drilling waste water complicated composition, containing the various components in mud, wherein major pollutants have: with bentonite
Based on suspended matter, petroleum-type, heavy metal, organic matter and chloride etc., composition and concentration with mud system, drilling well well depth and
The variation of drilling stratum and change, be the dilution of mud and the mixture of oils.Generally speaking, shale gas well-drilling waste water has
Following characteristics:
It is the liquid of dark brown or dark thick shape under normal circumstances 1. coloration is big, viscosity is big, complex chemical composition,
Biochemical treatment is poor；
2. moisture content is high, it is not easy to be dehydrated, pH is generally higher than 7；
3. containing more solid matter, such as clay, bentonite, landwaste；
4. certain speciality drilling fluids are because oil content is very high, so oil content is also higher in well-drilling waste water；
5. high COD, high organic concentration and containing heavy metal etc. be well-drilling waste water pollution key property, certain drilling wells
The COD content of waste water may be up to hundreds of thousands milligrams per liter.
Shale gas exploitation is deposited in water quality as domestic new industry, well-drilling waste water with conventional gas well-drilling waste water
It is varied for the method for various wastewater treatments at present in larger difference, it is related to coagulant sedimentation, chemical oxidization method, physics
Absorption method and gas floatation process etc., the treatment effect obtained according to environmental requirement using different method for waste water and combinations thereof is different, but
Targetedly the technology of processing shale gas well-drilling waste water is less, therefore, it is useless to seek viable economically, technically feasible drilling well
The Treatment process of water is imperative.
Summary of the invention
In view of the deficienciess of the prior art, the present invention proposes that a kind of shale gas well-drilling waste water processing method utilizes this method
Coagulating sedimentation is successively carried out to shale gas well-drilling waste water, Fenton oxidation-light electrolysis, chemical precipitation, removes ammonia nitrogen and four-effect evaporation
It handles, conventional index reaches national sewage comprehensive emission standard, chloride in shale gas well-drilling waste water after treatment by using the treatment method
Meet agricultural irrigation water quality standard.
The invention is realized by the following technical scheme:
A kind of shale gas well-drilling waste water processing method, the well-drilling waste water generated in shale gas drilling process are introduced into wastewater disposal basin
It is temporary, substep is carried out to the well-drilling waste water in wastewater disposal basin and is handled by different level, comprising the following steps:
Step 1: the well-drilling waste water in wastewater disposal basin being introduced into coagulative precipitation tank by pipeline, by the drilling well in coagulative precipitation tank
PH value of waste water is adjusted to 8~11, and coagulant and flocculation aid is added, staticly settles, is then separated by solid-liquid separation after mixing evenly, obtained
To the primary wastewater of first removal COD and SS, primary wastewater is introduced into Fenton oxidation-micro cell by pipeline；In drilling well
After coagulant and flocculation aid is added in waste water, the stirring of progress is to mix slowly, to promote coagulating sedimentation；
Step 2: the primary wastewater pH value in Fenton oxidation-micro cell being adjusted to 2~5, hydrogen peroxide and Fe/ is added
C filler, and it is pumped into air, the secondary waste water of secondary removal COD is obtained after reacting 1.5~2h, secondary waste water is drawn by pipeline
Enter chemical precipitation pond；Fe/C light electrolysis forms nascent state [H] under acidic conditions, has greater activity, acid stronger, newborn
[H] of state is more easy to form, and the increase of [H] is conducive to the degradation of organic matter, and can effectively overcome anode pole in acid condition
Change effect, generates more Fe2+, and then promote H2O2Advanced oxidation chain reaction generation, which occurs, more has Strong oxdiative ability
Hydroxyl radical free radical；By Fenton oxidation-micro-electrolysis reaction, higher COD removal rate can be obtained.
Step 3: the secondary waste water pH value in chemical precipitation pond being adjusted to 9~11, chemical precipitation agent is added, by temperature control
System stirs evenly and reacts 20min~40min at 80 DEG C, be then separated by solid-liquid separation, and obtains removal Ca2+And Mg2+Three-level
Three-level waste water is introduced ammonia nitrogen reaction tank by pipeline by waste water；Reaction temperature control can promote Ca for 80 DEG C2+And Mg2+Precipitating,
Remove Ca2+And Mg2+Equipment normal operation provides safeguard when can be the evaporation of subsequent waste water, and drilling well is useless when can reduce evaporation process
Extent of corrosion of the water to evaporator；
Step 4: the three-level pH value of waste water in ammonia nitrogen reaction tank being adjusted to 7~9, ammonia nitrogen removal agent is added, reacts 20min
~30min obtains the level Four waste water of removal ammonia nitrogen, level Four waste water is adjusted to neutrality and is introduced into evaporator by pipeline；
Step 5: the processing of cryogenic vacuum evaporation is carried out to level Four waste water in evaporator, obtains condensed water and concentrate,
Waste water makes COD, ammonia nitrogen and chloride that can reach discharge standard after evaporation process.
The amount that coagulant is added in the step 1 as a preferred technical solution, is 0.8~1.2kg/m3, i.e., every cube
0.8~1.2kg coagulant is added in rice well-drilling waste water, the amount that flocculation aid is added is 0.025~0.075kg/m3, i.e., every cubic metre
0.025~0.075kg flocculation aid, such design, it can be ensured that in coagulative precipitation tank in well-drilling waste water are added in well-drilling waste water
COD and SS removal rate maximize, save material, ensure COD and SS removal efficiency in well-drilling waste water.
The amount that 30% hydrogen peroxide is added in the step 2 as a preferred technical solution, is 4~8L/m3, i.e., every cubic metre
The hydrogen peroxide of 30% concentration of 4~8L is added in primary wastewater, the amount that Fe/C filler is added is 300~500kg/m3, i.e., often stand
The Fe/C filler of 300~500kg is added in square rice primary wastewater, chooses suitable 30% hydrogen peroxide and Fe/C filler, can ensure that
COD removal rate in Fenton oxidation-micro cell in primary wastewater maximizes, 30% hydrogen peroxide and Fe/C filling adding amount mistake
Less or excessively, it is low to will lead to COD removal rate.
Aerator is equipped in Fenton oxidation-micro cell as a preferred technical solution, one in the step 2
Grade waste water is added after hydrogen peroxide and Fe/C filler, controls the air amount of being pumped into, and making gas-water ratio control is 5:1~10:1；It is appropriate to increase
Add gas-water ratio that can effectively remove the passivation layer of waste iron filing and activated carbon surface deposition, increase primary wastewater is effective with Fe/C filler
Time of contact and contact area reduce the hardened probability of Fe/C filler, and whole system is promoted to generate more small primary batteries
With the hydroxyl radical free radical with Strong oxdiative ability, so that higher pollutants removal rate is obtained, when gas-water ratio is excessive, in waste water
Oxygen supersaturation, time of contact and contact area between waste water and Fe/C filler tail off, and lead to the reduction of COD removal rate；It chooses
Suitable gas-water ratio can ensure that the COD removal rate in Fenton oxidation-micro cell in primary wastewater maximizes.
The chemical precipitation agent in the step 3 is potassium carbonate or sodium carbonate as a preferred technical solution, and dosage is
2.0~4.0kg/m3, i.e. 2.0~4.0kg chemical precipitation agent, reaction time 30min are added in every cubic metre of secondary waste water；It is suitable
The chemical precipitation agent of amount can ensure that Ca2+And Mg2+Removal effect, and save material, excessive chemical precipitation agent can't be significant
Improve Ca2+And Mg2+Removal rate, the precipitation process of calcium carbonate and magnesium carbonate is a fast reaction process, within a short period of time
Available higher removal effect, and the longer the better for non-reaction time.
Ammonia nitrogen removal agent is added as sodium hypochlorite in three-level waste water in the step 4 as a preferred technical solution, and dosage
For 0.5~0.8kg/m3, i.e. the agent of 0.5~0.8kg ammonia nitrogen removal, suitable ammonia nitrogen removal are added in every cubic metre of three-level waste water
Agent can ensure that ammonia nitrogen removal frank maximizes in three-level waste water, and in the case where ensuring water quality reaching standard, obtain ammonia nitrogen removal agent
Minimum dosage, to reduce cost as far as possible.
Evaporator is four-effect evaporator in the step 5 as a preferred technical solution, and cryogenic vacuum evaporation is quadruple effect
Evaporation, including effect processing, the processing of two effects, triple effect processing and quadruple effect processing, wherein treatment conditions are: at an effect processing to quadruple effect
Heter temperature in reason is respectively 155 DEG C~165 DEG C, 95 DEG C~105 DEG C, 80 DEG C~90 DEG C, 65 DEG C~75 DEG C, and heater is exhausted
Pressure is respectively 95kPa~105kPa, 95kPa~105kPa, 55kPa~65kPa, 25kPa~35kPa；One effect is handled to quadruple effect
Separator temperature in processing is respectively as follows: 95 DEG C~105 DEG C, 80 DEG C~90 DEG C, 65 DEG C~75 DEG C, 50 DEG C~60 DEG C, separator
Absolute pressure is respectively 95kPa~105kPa, 55kPa~65kPa, 25kPa~35kPa, 10kPa~20kPa；Such design, energy
Ensure that four-effect evaporation maximizes the efficiency of level Four wastewater treatment and Economic optimization, COD in waste water after processing, ammonia nitrogen,
Chloride content or index can reach standard.
As a preferred technical solution, in the step 5 four-effect evaporation processing one effect treatment process in, heating source with
Conduction oil heats level Four waste water, such design, and conduction oil can be made to carry out heating to level Four waste water and replace raw steam
Level Four waste water is heated, without the concern for the water quality at water source, boiler maintenance is convenient.
Concentrate obtained in the step 5 is dehydrated and is dried as a preferred technical solution, obtain crystal salt and
Mother liquor carries out recycling recycling to crystal salt, and mother liquor re-injection to wastewater disposal basin is reprocessed；Such design, is avoided that mother
Liquid outlet reduces the risk of pollution environment.
Change as a preferred technical solution, by the solid-phase material precipitated in coagulative precipitation tank in the step 1 and in step 3
It learns the solid-phase material after being separated by solid-liquid separation in sedimentation basin and carries out recycling recycling respectively；Such design, can be by blocks of solid
Be fabricated to the products such as brick, cement, make resource again using and reduce pollution to environment.
As shown from the above technical solution, a kind of shale gas well-drilling waste water processing method provided by the invention, beneficial effect exist
In:
1, present invention process process is simple, can handle pollutant component and the more complex shale gas well-drilling waste water of concentration, place
Mother liquor re-injection after reason is recycled to wastewater disposal basin reprocesses, and does not need individual processing unit；
2, the present invention pre-processes shale gas well-drilling waste water using coagulant sedimentation, reduces the COD in well-drilling waste water, largely
Eliminate solid suspension object, colloidal organic matter, oils and the heavy metal etc. in water；
3, the present invention further removes the COD in well-drilling waste water using Fenton oxidation-light electrolysis, it is ensured that well-drilling waste water
The removal rate of middle COD；
4, the present invention reduces the metal ions such as calcium and the magnesium in shale gas well-drilling waste water before the evaporation, will evaporate influent quality
Calcium carbonate hardness control hereinafter, improve the purity of multiple-effect evaporation stages Nacl crystal salt, prevents in evaporator in 200mg/L
Portion's fouling reduces the corrosion of evaporator；
5, it uses sodium hypochlorite as ammonia nitrogen removal agent in the present invention, ammonia nitrogen in shale gas well-drilling waste water can not only be reduced
Content, moreover it is possible to reduce the COD in waste water, improve the purity of multiple-effect evaporation stages Nacl crystal salt；
6, in the present invention when four-effect evaporation, four that raw steam is handled an effect as heat transport medium are replaced using conduction oil
Grade waste water is heated, and without the concern for the water quality at water source, boiler maintenance is convenient；
7, the present invention shale gas well-drilling waste water is successively carried out coagulating sedimentation, Fenton oxidation-light electrolysis, chemical precipitation,
Except ammonia nitrogen and four-effect evaporation are handled, shale gas well-drilling waste water conventional index such as COD and ammonia nitrogen etc. can reach integrated wastewater after processing
The primary standard of discharge standard, chloride content are lower than 350mg/L, meet agricultural irrigation water quality standard.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is a kind of process flow diagram of shale gas well-drilling waste water processing method embodiment of the present invention.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be only used as example, and cannot be used as a limitation and limit protection model of the invention
It encloses.
It is handled based on the well-drilling waste water generated in the shale gas well drilling process of Chongqing, processing technological flow such as Fig. 1
It is shown.
Embodiment 1, a kind of shale gas well-drilling waste water processing method, comprising the following steps:
Step 1: the well-drilling waste water in wastewater disposal basin being introduced into coagulative precipitation tank by pipeline, by the drilling well in coagulative precipitation tank
PH value of waste water is adjusted to 8, and coagulant and flocculation aid is added, and coagulant additional amount is 0.8kg/m3, flocculation aid additional amount is
0.025kg/m3, staticly settle after mixing slowly uniformly, be then separated by solid-liquid separation, obtain the level-one for removing COD and SS for the first time
Waste water, by primary wastewater by pipeline introduce Fenton oxidation-micro cell, by the solid-phase material precipitated in coagulative precipitation tank into
Row recycling recycles；
Step 2: the primary wastewater pH value in Fenton oxidation-micro cell being adjusted to 2, hydrogen peroxide is added and Fe/C is filled out
Material, the amount that 30% hydrogen peroxide is added is 4L/m3, the amount that Fe/C filler is added is 300kg/m3, and it is pumped into air, gas-water ratio control
For 8:1, the secondary waste water of secondary removal COD is obtained after reacting 2h, secondary waste water is introduced into chemical precipitation pond by pipeline；
Step 3: the secondary waste water pH value in chemical precipitation pond being adjusted to 9, chemical precipitation agent sodium carbonate is added, and be added
Amount is 2kg/m3, temperature is controlled at 80 DEG C, stirs evenly and reacts 20min, be then separated by solid-liquid separation, obtains removal Ca2+
And Mg2+Three-level waste water, by three-level waste water by pipeline introduce ammonia nitrogen reaction tank, will in chemical precipitation pond be separated by solid-liquid separation after consolidating
Phase materials carry out recycling recycling respectively；
Step 4: the three-level pH value of waste water in ammonia nitrogen reaction tank being adjusted to 7, ammonia nitrogen removal agent sodium hypochlorite is added and adds
Entering amount is 0.5kg/m3, 20min is reacted, the level Four waste water of removal ammonia nitrogen is obtained, level Four waste water is adjusted to neutrality and passes through pipe
Road is introduced into evaporator；
Step 5: the evaporator is quadruple effect downflow type centor circling evaporator, and temperature and pressure is all made of PLC control,
Automatic feed, level Four waste water enter from an effect processing, then sequentially enter the processing of two effects, triple effect processing and quadruple effect processing, by quadruple effect
Processing discharging, the heat transport medium using conduction oil as an effect processing, the processing of two effects, triple effect processing and quadruple effect processing are adopted respectively
Use the steam of effect processing, two effect processing and triple effect processing generation as heat source, the heater of an effect processing and the temperature of separator
Degree is respectively 155 DEG C and 95 DEG C, and pressure is 100kPa, the heater of two effect processing and the temperature of separator be respectively 95 DEG C with
80 DEG C, pressure is respectively 100kPa and 55kPa, and the heater of triple effect processing and the temperature of separator are respectively 80 DEG C and 65 DEG C,
Pressure is respectively 55kPa and 26kPa, and the heater of quadruple effect processing and the temperature of separator are respectively 65 DEG C and 50 DEG C, pressure point
Not Wei 26kPa and 12kPa, concentration is evaporated to waste water under the above conditions respectively, steam carries out cooling shape by condenser
At condensed water, the concentrate obtained is handled through quadruple effect, crystal salt is formed by centrifuge separation and drying, the mother liquor re-injection isolated
It recycles and reprocesses to wastewater disposal basin.
Embodiment 2, a kind of shale gas well-drilling waste water processing method, comprising the following steps:
Step 1: the well-drilling waste water in wastewater disposal basin being introduced into coagulative precipitation tank by pipeline, by the drilling well in coagulative precipitation tank
Waste water 9, is added coagulant and flocculation aid, and coagulant additional amount is 1kg/m3, flocculation aid additional amount is 0.05kg/m3, mix slowly
It staticly settles after uniformly, is then separated by solid-liquid separation, obtain the primary wastewater for removing COD and SS for the first time, primary wastewater is passed through
Pipeline introduces Fenton oxidation-micro cell, and the solid-phase material precipitated in coagulative precipitation tank is carried out recycling recycling；
Step 2: the primary wastewater pH value in Fenton oxidation-micro cell being adjusted to 3, hydrogen peroxide is added and Fe/C is filled out
Material, the amount that 30% hydrogen peroxide is added is 6L/m3, the amount that Fe/C filler is added is 500kg/m3, and it is pumped into air, gas-water ratio control
For 5:1, the secondary waste water of secondary removal COD is obtained after reacting 2h, secondary waste water is introduced into chemical precipitation pond by pipeline；
Step 3: the secondary waste water pH value in chemical precipitation pond being adjusted to 10, chemical precipitation agent sodium carbonate is added, and add
Entering amount is 3kg/m3, temperature is controlled at 80 DEG C, stirs evenly and reacts 30min, be then separated by solid-liquid separation, obtains removal Ca2 +And Mg2+Three-level waste water, by three-level waste water by pipeline introduce ammonia nitrogen reaction tank, by chemical precipitation pond be separated by solid-liquid separation after
Solid-phase material carries out recycling recycling respectively；
Step 4: the three-level pH value of waste water in ammonia nitrogen reaction tank being adjusted to 8, ammonia nitrogen removal agent sodium hypochlorite is added and adds
Entering amount is 0.8kg/m3, 30min is reacted, the level Four waste water of removal ammonia nitrogen is obtained, level Four waste water is adjusted to neutrality and passes through pipe
Road is introduced into evaporator；
Step 5: the evaporator is quadruple effect downflow type centor circling evaporator, and temperature and pressure is all made of PLC control,
Automatic feed, level Four waste water enter from an effect processing, then sequentially enter the processing of two effects, triple effect processing and quadruple effect processing, by quadruple effect
Processing discharging, the heat transport medium using conduction oil as an effect processing, the processing of two effects, triple effect processing and quadruple effect processing are adopted respectively
Use the steam of effect processing, two effect processing and triple effect processing generation as heat source, the heater of an effect processing and the temperature of separator
Degree is respectively 160 DEG C and 100 DEG C, and pressure is 100kPa, and the heater of two effect processing and the temperature of separator are respectively 100 DEG C
With 85 DEG C, pressure is respectively 100kPa and 58kPa, and the heater of triple effect processing and the temperature of separator are respectively 85 DEG C and 70
DEG C, pressure is respectively 58kPa and 31kPa, and the heater of quadruple effect processing and the temperature of separator are respectively 70 DEG C and 55 DEG C, pressure
Respectively 31kPa and 16kPa, is evaporated concentration to waste water under the above conditions respectively, and steam is cooled down by condenser
Condensed water is formed, the concentrate obtained is handled through quadruple effect and crystal salt is formed by centrifuge separation and drying, the mother liquor isolated returns
Note is recycled to wastewater disposal basin and is reprocessed.
Embodiment 3, a kind of shale gas well-drilling waste water processing method, comprising the following steps:
Step 1: the well-drilling waste water in wastewater disposal basin being introduced into coagulative precipitation tank by pipeline, by the drilling well in coagulative precipitation tank
PH value of waste water is adjusted to 11, and coagulant and flocculation aid is added, and coagulant additional amount is 1.2kg/m3, flocculation aid additional amount is
0.075kg/m3, staticly settle after mixing slowly uniformly, be then separated by solid-liquid separation, obtain the level-one for removing COD and SS for the first time
Waste water, by primary wastewater by pipeline introduce Fenton oxidation-micro cell, by the solid-phase material precipitated in coagulative precipitation tank into
Row recycling recycles；
Step 2: the primary wastewater pH value in Fenton oxidation-micro cell being adjusted to 5, hydrogen peroxide is added and Fe/C is filled out
Material, the amount that 30% hydrogen peroxide is added is 8L/m3, the amount that Fe/C filler is added is 500kg/m3, and it is pumped into air, gas-water ratio control
For 10:1, the secondary waste water of secondary removal COD is obtained after reacting 2h, secondary waste water is introduced into chemical precipitation pond by pipeline；
Step 3: the secondary waste water pH value in chemical precipitation pond being adjusted to 11, chemical precipitation agent sodium carbonate is added, and add
Entering amount is 4kg/m3, temperature is controlled at 80 DEG C, stirs evenly and reacts 40min, be then separated by solid-liquid separation, obtains removal Ca2 +And Mg2+Three-level waste water, by three-level waste water by pipeline introduce ammonia nitrogen reaction tank, by chemical precipitation pond be separated by solid-liquid separation after
Solid-phase material carries out recycling recycling respectively；
Step 4: the three-level pH value of waste water in ammonia nitrogen reaction tank being adjusted to 9, ammonia nitrogen removal agent sodium hypochlorite is added and adds
Entering amount is 0.8kg/m3, 30min is reacted, the level Four waste water of removal ammonia nitrogen is obtained, level Four waste water is adjusted to neutrality and passes through pipe
Road is introduced into evaporator；
Step 5: the evaporator is quadruple effect downflow type centor circling evaporator, and temperature and pressure is all made of PLC control,
Automatic feed, level Four waste water enter from an effect processing, then sequentially enter the processing of two effects, triple effect processing and quadruple effect processing, by quadruple effect
Processing discharging, the heat transport medium using conduction oil as an effect processing, the processing of two effects, triple effect processing and quadruple effect processing are adopted respectively
Use the steam of effect processing, two effect processing and triple effect processing generation as heat source, the heater of an effect processing and the temperature of separator
Degree is respectively 165 DEG C and 105 DEG C, and pressure is 100kPa, and the heater of two effect processing and the temperature of separator are respectively 105 DEG C
With 85 DEG C, pressure is respectively 100kPa and 65kPa, and the heater of triple effect processing and the temperature of separator are respectively 90 DEG C and 75
DEG C, pressure is respectively 65kPa and 35kPa, and the heater of quadruple effect processing and the temperature of separator are respectively 75 DEG C and 60 DEG C, pressure
Respectively 35kPa and 20kPa, is evaporated concentration to waste water under the above conditions respectively, and steam is cooled down by condenser
Condensed water is formed, the concentrate obtained is handled through quadruple effect and crystal salt is formed by centrifuge separation and drying, the mother liquor isolated returns
Note is recycled to wastewater disposal basin and is reprocessed.
Embodiment 1, embodiment 2 and embodiment 3 are respectively handled same a bite shale gas well well-drilling waste water, after processing
Waste water in various pollutants content be shown in Table 1:
Table 1
According to " integrated wastewater discharge standard " (GB8978-1996) primary standard and " agricultural irrigation water quality standard "
(GB5084-2005), water should meet pH value after processing: 6.0~9.0, COD≤100mg/L, salinity≤1000mg/L, chloride
≤ 350mg/L, ammonia nitrogen≤15mg/L.
As shown in Table 1, after being handled by embodiment 1, embodiment 2 and embodiment 3 shale gas well-drilling waste water, processing
Water quality afterwards meets " integrated wastewater discharge standard " (GB8978-1996) primary standard and " agricultural irrigation water quality standard "
(GB5084-2005), the index and after processing in water is much smaller than " integrated wastewater discharge standard " (GB8978-1996) primary standard
And the index in " agricultural irrigation water quality standard " (GB5084-2005)；By being compared to each other, embodiment 2 handles shale gas drilling well
The effect of waste water is preferable.
Therefore, present invention process process is simple, can handle pollutant component and the more complex shale gas well-drilling waste water of concentration,
Mother liquor re-injection that treated is recycled to wastewater disposal basin and is reprocessed, and does not need individual processing unit；The present invention uses coagulant sedimentation
Shale gas well-drilling waste water is pre-processed, reduces the COD in well-drilling waste water, solid suspension object, the colloid largely eliminated in water has
Machine object, oils and heavy metal etc.；The present invention further removes the COD in well-drilling waste water using Fenton oxidation-light electrolysis, it is ensured that
The removal rate of COD in well-drilling waste water；The present invention reduces the metal ions such as calcium and magnesium in shale gas well-drilling waste water before the evaporation,
By evaporation influent quality calcium carbonate hardness control in 200mg/L hereinafter, improving the pure of multiple-effect evaporation stages Nacl crystal salt
Degree, prevents evaporator internal incrustation, can reduce the corrosion of evaporator；Using sodium hypochlorite as ammonia nitrogen removal agent in the present invention,
The content of ammonia nitrogen in shale gas well-drilling waste water can not only be reduced, moreover it is possible to reduce the COD in waste water, improve multiple-effect evaporation stages work
The purity of industry salt crystal salt；In the present invention when four-effect evaporation, raw steam is replaced to imitate as heat transport medium to one using conduction oil
The level Four waste water of processing is heated, and without the concern for the water quality at water source, boiler maintenance is convenient；The present invention is useless to shale gas drilling well
Water successively carries out coagulating sedimentation, Fenton oxidation-light electrolysis, chemical precipitation, removes ammonia nitrogen and four-effect evaporation processing, shale after processing
Gas well-drilling waste water conventional index such as COD and ammonia nitrogen etc. can reach the primary standard of integrated wastewater discharge standard, and chloride content is low
In 350mg/L, meet agricultural irrigation water quality standard.
Above-described embodiment is merely exemplary to illustrate the principle of the present invention and its effect, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, all those of ordinary skill in the art are completed without departing from the spirit and technical ideas disclosed in the present invention
All equivalent modifications or change, should be covered by the claims of the present invention.
Claims (9)
1. a kind of shale gas well-drilling waste water processing method, it is characterised in that: the well-drilling waste water generated in shale gas drilling process draws
Enter in wastewater disposal basin and keep in, substep is carried out to the well-drilling waste water in wastewater disposal basin and is handled by different level, comprising the following steps:
S1: the well-drilling waste water in wastewater disposal basin is introduced into coagulative precipitation tank by pipeline, by the well-drilling waste water pH in coagulative precipitation tank
Value is adjusted to 8~11, and coagulant and flocculation aid is added, staticly settles, is then separated by solid-liquid separation after mixing evenly, obtains first
Primary wastewater is introduced Fenton oxidation-micro cell by pipeline by the primary wastewater for removing COD and SS；
S2: the primary wastewater pH value in Fenton oxidation-micro cell being adjusted to 2~5, hydrogen peroxide and Fe/C filler is added,
And it is pumped into air, the secondary waste water of secondary removal COD is obtained after reacting 1.5~2h, secondary waste water is introduced into chemistry by pipeline
Sedimentation basin；
S3: the secondary waste water pH value in chemical precipitation pond is adjusted to 9~11, chemical precipitation agent is added, temperature is controlled 80
DEG C, 20min~40min is stirred evenly and reacted, is then separated by solid-liquid separation, removal Ca is obtained2+And Mg2+Three-level waste water, will
Three-level waste water introduces ammonia nitrogen reaction tank by pipeline；
S4: the three-level pH value of waste water in ammonia nitrogen reaction tank is adjusted to 7~9, is added ammonia nitrogen removal agent, and reaction 20min~
30min obtains the level Four waste water of removal ammonia nitrogen, level Four waste water is adjusted to neutrality and is introduced into evaporator by pipeline；
S5: the processing of cryogenic vacuum evaporation is carried out to level Four waste water in evaporator, obtains condensed water and concentrate.
2. a kind of shale gas well-drilling waste water processing method according to claim 1, it is characterised in that: be added in the S1 mixed
The amount of solidifying agent is 0.8~1.2kg/m3, the amount that flocculation aid is added is 0.025~0.075kg/m3。
3. a kind of shale gas well-drilling waste water processing method according to claim 1 or 2, it is characterised in that: add in the S2
The amount for entering 30% hydrogen peroxide is 4~8L/m3, the amount that Fe/C filler is added is 300~500kg/m of primary wastewater total amount3。
4. a kind of shale gas well-drilling waste water processing method according to claim 3, it is characterised in that: level-one is useless in the S2
Water is added after hydrogen peroxide and Fe/C filler, controls the air amount of being pumped into, makes gas-water ratio 5:1~10:1.
5. a kind of shale gas well-drilling waste water processing method according to claim 1 or 4, it is characterised in that: in the S3
Chemical precipitation agent is potassium carbonate or sodium carbonate, and dosage is 2.0~4.0kg/m3, reaction time 30min.
6. a kind of shale gas well-drilling waste water processing method according to claim 5, it is characterised in that: three-level is useless in the S4
It is sodium hypochlorite that ammonia nitrogen removal agent, which is added, in water, and dosage is 0.5~0.8kg/m3。
7. a kind of shale gas well-drilling waste water processing method according to claim 1 or 6, it is characterised in that: steamed in the S5
Hair device is four-effect evaporator, and cryogenic vacuum evaporation is four-effect evaporation, including effect processing, the processing of two effects, triple effect processing and four
Effect processing, wherein treatment conditions are: heter temperature of the effect processing into quadruple effect processing is respectively 155 DEG C~165 DEG C, 95 DEG C
~105 DEG C, 80 DEG C~90 DEG C, 65 DEG C~75 DEG C, heater absolute pressure be respectively 95kPa~105kPa, 95kPa~105kPa,
55kPa~65kPa, 25kPa~35kPa；One effect processing to quadruple effect processing in separator temperature be respectively as follows: 95 DEG C~105 DEG C,
80 DEG C~90 DEG C, 65 DEG C~75 DEG C, 50 DEG C~60 DEG C, separator absolute pressure be respectively 95kPa~105kPa, 55kPa~65kPa,
25kPa~35kPa, 10kPa~20kPa.
8. a kind of shale gas well-drilling waste water processing method according to claim 7, it is characterised in that: obtained in the S5
Concentrate is dehydrated and is dried, and crystal salt and mother liquor are obtained, and crystal salt recycling recycles, and mother liquor re-injection to wastewater disposal basin carries out
Reprocessing.
9. a kind of shale gas well-drilling waste water processing method according to claim 1 or claim 7, it is characterised in that: will be in the S1
Solid-phase material after being separated by solid-liquid separation in chemical precipitation pond in the solid-phase material and S3 precipitated in coagulative precipitation tank carries out resource respectively
Change and recycles.
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