CN101538096B - Method for processing waste slurry - Google Patents
Method for processing waste slurry Download PDFInfo
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- CN101538096B CN101538096B CN2009100829305A CN200910082930A CN101538096B CN 101538096 B CN101538096 B CN 101538096B CN 2009100829305 A CN2009100829305 A CN 2009100829305A CN 200910082930 A CN200910082930 A CN 200910082930A CN 101538096 B CN101538096 B CN 101538096B
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Abstract
The invention discloses a method for processing waste slurry, comprising the following steps: firstly, a sand-stone segregation apparatus separates, washes and discharges the drill cuttings sand and stone in the slurry; the pH value of the remaining slurry is adjusted and the COD value thereof is reduced; the solid and the liquid are separated from each other in a way of composite flocculating; water solution is separated out from the solid in a way of mechanical drying; the dried solid isolate meets the relative standard so as to be processed in a way of stacking or land filling; finally the separated water solution is processed in a way of filtration and reverse osmosis so as to obtain fresh water which is recycled or discharged on the spot. The method can be carried out by matching with an unit device and make continuously impending treatment of the well drilling waste slurry during drilling synchronously with normal well drilling production so as to continuously process the efflux hazardous waste to meet the discharge standard with out loading in the well drilling of oil-gas field, change the prior traditional whole efflux curingprocess mode, and fills the gap of an environmentally friendly governing field of oil drilling in the domestic.
Description
Technical field
The present invention relates to efflux in the oilfield drilling process danger treatment of wastes produced, particularly a kind of treatment process innoxious up to standard of drilling well discarded slurry.
Background technology
In the drilling process of oil gas well, the drilling fluid of adapted complicated chemical medicament, effluxes from well head from underground a large amount of landwaste and the sandstone of carrying out through after high temperature, highly compressed physical change under thousands of meters, becomes the danger refuse of underflow shape.For a long time, China to oilfield drilling the endanger processing of refuse (discarded slurry, efflux mud, drilling cuttings) adopt first centralized collection near the dirty mud sump that rig, digs block, be cured the method for burying again and handle.This method has not only taken a large amount of land resources (every mouthful of well takes up an area of 2-5 mu), construction cost and processing costs height, and in fact not to the danger refuse--the drilling well discarded slurry, efflux mud and drilling cuttings (listing national environmental protection portion 2008 solids danger refuse register in) carries out innoxious processing up to standard, promptly, its source of pollution exist all the time, because of excessive, seepage cause direct pollution to environment, or become physical environment, underground water source and ecological pollution hidden trouble.
30% is that drilling fluid is from underground landwaste that carries out and sandstone in drilling process in the drilling well discarded slurry, and these landwaste and sandstone are wrapped up by the mud that contains the large amount of complex chemical agent, and efflux with these mud, becomes solid danger refuse.If when mud effluxes, can earlier these landwaste and sandstone be separated from mud, and it is washed, making it to reach innoxious emission standard discharges or recycling, just can reduce the total content that the drilling well discarded slurry effluxes solid particulate matter in the thing, reduce the slurry denseness of discarded slurry, make the residue waste mud become flowability fluid thin pulp preferably, entering down one continuous processing technique program handles, thereby for realizing that whole discarded slurry does not land (promptly, no longer discarded slurry being drained in the discarded slurry pond) continuous processing up to standard plays crucial effect, and then change present traditional integral and efflux the solidification treatment pattern, fill up the blank in domestic petroleum drilling well environment protection treating field.
Summary of the invention
The objective of the invention is to change at present oilfield drilling is effluxed the dig pit processing present situation of collection, integrally curing, emergency burial of danger refuse, provide a kind of and can direct reception the in continuous and effective ground efflux discarded slurry, and it is carried out the method for continuous comprehensive treating process by the series of process program, finally discharge objectionable impurities and resource is recycled.
Technical scheme of the present invention is as follows:
A kind of treatment process of discarded slurry comprises the following steps:
1) utilizes sandstone tripping device reception discarded slurry, wherein separation of drilling cuttings sandstone and washing back are discharged, and the mud after washing the slurry of generation and removing the drilling cuttings sandstone enters step 2 after mixing);
2) mud behind the removal drilling cuttings sandstone is regulated the pH value and reduced its COD value, carry out composite flocculation then, solid, liquid is separated, adopting machinery to take off drying method at last separates out the aqueous solution from solids, the solid isolate that takes off after doing is up to standard, can stack or landfill disposal, and the aqueous solution of separating enters step 3);
3) aqueous solution is filtered and reverse-osmosis treated, the fresh water that obtains is recycled or on-the-spot discharging.
Above-mentioned steps 1) be to realize that drilling well effluxes discarded slurry and do not land the key of continuous processing up to standard.By discharge on the drilling well vibrating screen panel the danger waste mud directly enter or be equipped with (as worm conveyor etc.) by preceding extending and enter the sandstone tripping device, the particulate separation such as a large amount of drilling cuttings sandstones that contain in the mud are come out, alleviate and reduce of the influence of such material subsequent disposal.
The sandstone tripping device that the present invention adopts is that a screen basket is set in a tank body, this screen basket is communicated with a worm conveyor (claiming auger again), effluxing the danger waste mud flows in the screen basket earlier, thin slurry filters screen cloth and enters in the outer tank body of screen basket, big particulate matter (being the drilling cuttings sandstone) then enters in the worm conveyor, worm conveyor carries out spray washing to it when carrying the drilling cuttings sandstone, at last that washed drilling cuttings sandstone drain tank is external, and the slurry that washing produces flows in the tank body.
The screen basket of above-mentioned sandstone tripping device can be stationary screen or trommel screen.The screen-aperture size of screen basket generally is 0.1～10mm, and preferred 1～5mm, screen-aperture select to adapt to follow-up mud and take off dried processing apparatus.As take off and do equipment choosing vacuum band filter, for the water filtering performance that improves mud should be chosen the upper limit; Select pressure type band filter if take off dried equipment, for the protection strainer should be chosen lower limit.
For the screen basket of stationary screen form, usually an agitator need be set in screen basket, to increase the flowability of mud, avoid stopping up sieve aperture.Described agitator is preferably anchor stirrer.The screen basket of stationary screen form is usually designed to funnel-form, and its upper port receives mud, and lower port is communicated with worm conveyor.And the screen basket of trommel screen form generally is with the oblique placement of trommel screen, goes into sieve mouthful at a high end, and screening mouth is at a low end, and screening mouth is communicated with described worm conveyor.Worm conveyor also is oblique placement usually, and low side is provided with the sandstone inlet, and the high-end sandstone that is provided with exports, and the sandstone outlet is positioned at outside the tank body.
After sandstone entered worm conveyor, the flight in worm conveyor carried out spray washing to sandstone when promoting sandstone.Can carry out spray washing to the sandstone in promoting by one or more washing mouth spray water sprays that are arranged on the middle part of worm conveyor, reach the effect of cleaning.Simultaneously, the bottom of worm conveyor is a mesh-like, and the slurry that washing produces also flows in the tank body, and the slurry denseness is reduced becomes liquid preferably, reaches the purpose of pulping.
Above-mentioned tank body is generally box-shaped, and filter is gone into jar intravital slurry and kept flow state by one or more agitators stirrings, and by slush pump output tank body, delivers to next processing unit.
Step 1) can make drilling well efflux in the discarded slurry about 30% solids (mainly being the drilling cuttings sand grains of particle diameter more than 1mm) to break away from slurry, and the drilling cuttings sandstone behind the separating, washing can reach emission standard, and (carry out detection method: GB5086.2-1997 solid waste leaches toxicity, leaching method--horizontal succusion; The first class index of operative norm " integrated wastewater discharge standard---GB8978-1996 ").Simultaneously, residue slurry denseness is reduced becomes liquid preferably, by slush pump output, enters into step 2) handle.
Because the difference of geologic condition, mud carries out hazardous substances such as multiple bases, salt, petroleum-type, heavy metal class in the thousands of meters drilling process, and the amount of carrying alters a great deal.Must use multiple physics, chemical means to remove step by step.
Step 2) at first mud being carried out pH adjusts and forced oxidation.The mud of getting rid of from the sandstone tripping device is introduced into the mud storage stirred pot, adds first treatment agent simultaneously and stirs.First treatment agent has two classes: a class is acid or alkali, and in order to adjust the pH value of mud, what select for use usually is hydrochloric acid or sodium hydroxide (caustic soda), and injected volume is as the criterion to reach pH6～9; One class is an oxygenant, can adopt hydrogen peroxide or clorox (chlorinated lime), in order to reduce the COD and the BOD of mud.The injected volume of oxygenant will be according to adjusting follow-up detected result of taking off the mud cake that dry-cure obtains, and target is to make the mud cake that takes off after the dry-cure can reach national environmental standard, requires to detect gained COD value arrival≤100mg/L usually.
For guaranteeing the reaction times of first treatment agent, mud storage stirred pot capacity should take off 5～10 times that do the device processes amount greater than follow-up, and will add first treatment agent when mud enters mud storage stirred pot in batches.
For the continuity and the stability of follow-up system work, must the control concentration of hydraulic mixture stable, concentration of hydraulic mixture general requirement solids content is controlled at 1%～10% (weight percentage), need specifically set according to the requirement that follow-up machinery takes off dried equipment.Control for concentration of hydraulic mixture is that the mud that mud is stored in the stirred pot is pumped in the mud material-compound tank with pump, carries out in the mud material-compound tank by adding reuse water (or clear water).The addition of water generally is about 1 times of mud amount that enters the mud material-compound tank.
Because mud exists with colloidal state, the aqueous solution is difficult for directly sloughing, thereby makes organic class and other chemical substance in the mud also be difficult to remove.Step 2) also to carry out composite flocculation, realize breaking surely, solid, liquid is separated mud.Concrete way is water (reuse water or clear water) dissolving two kind of second treatment agent (being flocculation agent and flocculation agent) in different dispensing canisters at first respectively, after the mud of adjusting concentration injects the slurry reaction jar, pump into flocculation agent and flocculant solution respectively, stirred 10～15 minutes.
Flocculation agent can adopt polymerize aluminum chloride or poly-ferric chloride, obtain solution concentration 3～8wt%, and preferred 5wt% adds ratio about 15%, by the weight ratio of flocculation agent solution based on handled mud.
Flocculation agent can adopt polyacrylamide (molecular weight 8,000,000～1,200 ten thousand) or diallyl dimethyl ammoniumchloride (molecular weight 8,000,000), and obtain solution concentration about 0.2% adds ratio 5%, by the weight ratio of flocculant solution based on handled mud.
Mud stops to stir after dispensing is stirred 10～15 minutes, and the very fast come-up of clear liquid illustrates that the dispensing ratio is fit to.If the solid-liquid inferior separating effect then need be adjusted the dispensing ratio.In different areas, the different drilling depth dispensing ratios of areal are discrepant, need to determine by test.
When mud continue to stir, with slush pump to taking off dried equipment slurry conveyed.
Step 2) after flocculation, adopt machinery take off dried method water and chemical substance mutually blended solution from solids, separate out.It can be to utilize vacuum suck method or centrifugal separation or extruding to take off dry method the aqueous solution is deviate from that described machinery takes off dried method, take off dried equipment and can select vacuum suck band filter or ceramic plate filter, centrifugal centrifugal dry machine, screw extrusion centrifugal dry machine etc. for use, the solids separation thing (mud cake) that takes off after doing has reached innoxious, can stack or landfill disposal, and the aqueous solution of separating collect the back by pump delivery to the subsequent disposal unit.
Step 2) carries out, the hazardous substance in the discarded slurry is substantially all focused on the aqueous solution.
Above-mentioned steps 3) taking off the dried sewage of separating is the aqueous solution that contains the number of chemical material, common treatment process is at first by setting tank (or settling tank) it to be precipitated, cascade filtration then, and can in setting tank (or settling tank), install air-floating apparatus additional.After the organic contamination degree of suspended substance that in removing water, contains and reduction sewage, enter reverse osmosis system again and carry out concentration.
Sewage is carried out can also adding smart filter ultra-filtration process behind the cascade filtration, and then enter the two-section type reverse osmosis system and handle, remove chlorion and other chemical substance in anhydrating, make water water quality after the processing reach primary standard in " national sewage comprehensive emission standard ".
The fresh water that reverse osmosis is come out enters the reuse water tank, because this portion water water quality reached even be better than emission standard, so available pump promotes and delivers to the local or discharging that needs the fresh water reuse; And the liquid after concentrating can the reuse drilling well or adopt dense batch can to collect after focus on.Because the difference of drilling depth, therefore the mud character that produces is also incomplete same.Different mining according to drilling depth is handled with different reverse osmosis unit (installing thoroughly as fresh water reverse osmosis and seawater reverse osmosis).
The present invention adopts physics and chemofacies bonded method, has realized that oilfield drilling effluxes the danger refuse and do not land continuous processing up to standard, changes present traditional integral and effluxes the solidification treatment pattern, fills up the blank in domestic petroleum drilling well environment protection treating field.The inventive method is by adopting the cell arrangement matching running, the drilling well discarded slurry is handled with boring continuously, carry out synchronously with normal drilling well production, especially the drilling well discarded slurry can be carried out sandstone separation, solid-liquid separation, take off dry-cure, water circulation use and processing, finish solid formation, water qualified discharge (reaching solid useless, the sewage drainage standard of country) or utilization again in finally drilling fluid being effluxed.The present invention has realized environmental protection, energy-saving and emission-reduction, has economized the land resource and utilization of waste material, is the new technology that the dangerous poisonous pollution waste in the oil-gas field probing exploitation is administered.
The present invention compares with present solidification processing method, has outstanding technical superiority:
(1) landwaste of handling out with brill, disintegrating slag, mud cake have reached innoxiously, combine with local environmental administration, and mud cake, disintegrating slag etc. can be used for paving the way, place mat well site or recycling;
(2) be excused from a college course the discarded slurry pond, the useless admittedly volume of handling has reduced (traditional curing generally will increase by 30% volume because of adding cured article), and no longer needs the useless admittedly field of stacking, and can save a large amount of land resources;
(3) eliminated the environmental pollution risk;
(4) adopt the mechanical transfer of mud and drilling cuttings, reduced the weevil's of drill crew labour intensity greatly;
(5) with the cycling utilization of wastewater that bores after handling, the concentrated solution that contains chemical ingredients or chlorion can and become the Industrial Salt raw material by drilling team's recovery.
(6) remarkable in economical benefits, after drill crew adopts method of the present invention, compare with curing in the past, individual well (every mouthful of well discarded slurry is in 4000 sides) processing cost descends greatly: with the drilling well of STRUCTURES IN EAST SICHUAN gas well is example, the individual well processing cost about 1,720,000 of original method, and the inventive method is about 950,000, and individual well is saved cost 770,000.
In addition, method of the present invention not only can be used for the processing that oilfield drilling effluxes the danger waste mud, can also be used for the processing of other drilling wells, drilling project (for example geological prospecting, boring bridge pier etc.), muddy water pressurization shielding method driving (for example subway, river-crossing tunnel, municipal plumbing etc.) discarded slurry, and the processing of other industry and sanitary wastewater waste residue, be widely used in fields such as oil, metallurgy, mine, coal, building, chemical industry, electric power, water conservancy, traffic.
Description of drawings
Fig. 1 is the longitudinal section organigram of stationary screen sandstone tripping device in the embodiment of the invention.
Fig. 2 is the structural representation of embodiment of the invention intermediate roll sieve sandstone tripping device.
Fig. 3 is that the embodiment of the invention effluxes the schema that the danger waste mud is handled to drilling well.
Among the figure:
1. tank body 2. stationary screens 3. stationary screen agitators 4. augers 5. are washed mouth sprays
6. sandstone exports 7. slurry agitators, 8. slush pump, 9. auger motors, 10. trommel screens
10-1. go into sieve mouthful 10-2. screening mouth 10-3. transmission rig
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Present embodiment adopts three processing units to realize entire treatment technology, treatment scheme as shown in Figure 3:
One, first module is mainly used to collect the drilling well danger waste mud that is effluxed by rig, at first enter worm conveyor, conveying stirring by spiral enters the sandstone tripping device, after agitator treating and spiral separation, a large amount of inorganic particles of containing in the mud are separated out with little rock piece, landwaste etc., alleviate and reduce of the influence of such material subsequent disposal.
Fig. 1 is the synoptic diagram of the sandstone tripping device of stationary screen form, comprises the tank body 1 of a box-shaped, is provided with the funnelform stationary screen 2 of a cylinder in tank body 1, and the stationary screen agitator 3 of anchor formula is housed in the stationary screen 2; It is auger 4 that the lower part outlet of stationary screen 2 is communicated with worm conveyor, and auger 4 does not have an auger for tubular type, is obliquely installed, and the bottom is arranged in tank body 1, and stretch out outside the tank body 1 on top; Auger motor 9 places the top of auger 4, and it drives the flight rotation in the auger 4; Auger 4 tops also are provided with sandstone outlet 6, and auger 4 middle parts are provided with washing mouth spray 5, and auger 4 bottoms are mesh-like; Also be provided with slurry agitator 7 in tank body 1, tank body 1 bottom is provided with slush pump 8.
Fig. 2 is the structural representation of the sandstone tripping device of trommel screen form, comprises the tank body 1 of a box-shaped; The oblique trommel screen 10 that is provided with in tank body 1, diameter of cylinder 1400mm, long 1400mm, about 10 degree in angle of inclination are gone into sieve mouthful 10-1 high-end at trommel screen, and screening mouth 10-2 is at low side, trommel screen 10 drives through transmission rig 10-3 by motor and rotates; The trommel screen 10 laterally inclined worm conveyors that are provided with, promptly tubular type does not have an auger 4.Except that screen basket, other structures of the sandstone tripping device of trommel screen form are identical with the stationary screen form.
Effluxing the danger waste mud is introduced in the screen basket (being stationary screen 2 or trommel screen 10) in the tank body 1, stir the rolling that forms eddy flow or pass through trommel screen 10 by anchor formula stationary screen agitator 3 and form eddy flow, it is in the tank body 1 that thin slurry filtration screen cloth enters mud pit, the tubular type that big particulate matter (drilling cuttings sandstone) falls under the screen basket does not have in the auger 4, drive through auger motor 9, the drilling cuttings sandstone promotes by the auger flight, discharges from the sandstone outlet 6 at auger 4 tops.Be equipped with washing mouth spray 5 at the middle part of tubular type auger, drilling cuttings sandstone in auger 4 promotes is carried out spray washing, reach the effect of cleaning, so just the drilling cuttings sandstone separating, washing in the mud is come out, make the solids (mainly being the drilling cuttings sand grains of particle diameter more than 1mm) about 30% in the discarded slurry break away from slurry, and the drilling cuttings sandstone that effluxes after the separation can reach emission standard (execution detection method: GB 5086.2-1997 solid waste leaching toxicity, leaching method--horizontal succusion; The first class index of operative norm " integrated wastewater discharge standard---GB8978-1996 ").Simultaneously, bath water flows into the tank body from the auger bottom, and residue slurry denseness is reduced becomes liquid preferably, reaches the purpose of pulping.Agitator in the tank body makes slurry keep flow state, and slush pump 8 outputs by tank base enter into down together processing unit continuously.And the drilling cuttings sandstone that effluxes can be used for place mat road place usefulness, has realized environmental protection and utilization of waste material.
Below table 1,2 and 3 listed be the specification and the main operating parameter thereof of the sandstone tripping device in the practical application of the present invention.
Table 1.HD sand-stone separator model and specification thereof
| Box sizes m | Screen basket (mm) | Sieve aperture (mm) | Mud capacity (t/h) | |
| HD-I (stationary screen) | 3.6×1.6×1.4 | Φ1400×700 | Φ0.1~ |
5～10 |
| HD-II (stationary screen) | 4.5×2.0×1.4 | Φ1800×700 | Φ0.1~ |
10～20 |
| HD-III (trommel screen) | 3.6×1.6×1.1 | Φ1400×1400 | Φ0.1～ |
5～10 |
Table 2.HD-I and HD-II sand-stone separator significant parameter
| The stationary screen power of agitator | The stationary screen mixing speed | Tubular type auger power | Tubular type auger rotating speed | The spray washing flow |
| N＝2.2/3.0kw | N=20 rev/min | N＝3.0/5.0kw | N=30 rev/ |
1=10～151/ minute |
Table 3.HD-III sand-stone separator significant parameter
| The trommel screen power of motor | The trommel screen rotating speed | Tubular type auger power | Tubular type auger rotating speed | The spray washing flow |
| N＝5.0kw | N=15 rev/min | N＝3.0kw | N=30 rev/ |
1=10～501/ minute |
Table 4. goes out machine sandstone detected result
Annotate: GB5085.3-1996 " Hazardous wastes judging standard-leaching toxicity is differentiated ";
GB8978-1996 " sewage discharge comprehensive standard " primary standard.
Two, Unit second will be sent in the mud storage stirred pot through the mud after the sandstone separating treatment, add first treatment agent, after mixing reaction, allocating concentration of hydraulic mixture with reuse water by being pumped in the mud material-compound tank, and then send in the slurry reaction jar, add second treatment agent simultaneously, finish coagulation and help with fixed attention and solid-liquid separation, and then centrifugal dry machine carries out mud, water sepn is taken off dried by being pumped into.
Table 5. treatment of mud assay
Up to standard after the solids separation in the mud, can stack or fill out the hole and pave the way.The water of separating enters water tank and collects, and is promoted by pump then and send the 3rd processing unit.
Three, Unit the 3rd carries out cascade filtration to the sewage elder generation post precipitation of separating through centrifugal dry machine earlier, after removing suspended substance that contains in the water and the organic contamination degree that reduces waste water, carry out essence filter ultrafiltration again, enter the two-section type reverse osmosis system at last and carry out concentration.The reverse osmosis fresh water that comes out enters the reuse water tank, because this portion water reached even has been better than emission standard, and therefore can be by drilling team's reuse or discharging; And the liquid after concentrating can the reuse drilling well or adopt dense batch can to collect after focus on, can build that incinerator focuses on or evaporative crystallization is handled, crystal salt can be sold to salt chemical engineering manufacturing enterprise, changing waste into valuable.Because the difference of drilling depth, therefore the mud character that produces is also incomplete same.Different mining according to drilling depth is handled with different reverse osmosis unit (fresh water reverse osmosis and seawater reverse osmosis are saturating).
Table 6. water treatment assay
Annotate: 1. except that chromaticity unit be times and the pH value, all the other project units are mg/L;
2. after taking from one-level before the sample preparation and filtering (sand filtration), take from two-pass reverse osmosis after the sample preparation after.
The treatment scheme of present embodiment is referring to Fig. 3, the discarded slurry that drilling well produces is by unit equipment collection, separating, washing sandstone, pulping, broken firm liquid separation, solid formation dehydration, sewage water filtration, reverse-osmosis treated program, making post-treatment solid phase thing (landwaste, sandstone, sandy soil) and water reach innoxious emission standard discharges or recycling, that has realized whole drilling well discarded slurry does not land (that is, no longer discarded slurry being drained in the discarded slurry pond) continuous processing up to standard.
Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration, but it will be appreciated by those skilled in the art that: in the spirit and scope that do not break away from the present invention and claims, various replacements, variation and modification all are possible, therefore, scope of the present invention is not limited to embodiment and the disclosed content of accompanying drawing.
Claims (9)
1. a method for processing waste slurry comprises the steps:
1) utilize the sandstone tripping device to receive discarded slurry, described sandstone tripping device is that a screen basket is set in a tank body, this screen basket is communicated with a worm conveyor, described worm conveyor tilts to insert in the tank body, low side is provided with the sandstone inlet, the high-end sandstone that is provided with exports, the sandstone outlet is positioned at outside the tank body, discarded slurry flows in the screen basket earlier, thin slurry filters screen cloth and enters in the tank body, the drilling cuttings sandstone then enters in the worm conveyor, worm conveyor carries out spray washing to it when carrying the drilling cuttings sandstone, at last that washed drilling cuttings sandstone drain tank is external, enter step 2 and wash in the slurry inflow tank body that produces and after the mud mixing behind the removal drilling cuttings sandstone);
2) regulate the pH value of mud and reduce its COD value, carry out composite flocculation then, solid, liquid is separated, adopt machinery to take off drying method again the aqueous solution is separated out from solids, the solid isolate that takes off after doing is stacked or landfill disposal, and the aqueous solution of separating enters step 3);
3) aqueous solution is filtered and reverse-osmosis treated, obtain fresh water.
2. treatment process as claimed in claim 1 is characterized in that, described screen basket is stationary screen or trommel screen, and the screen-aperture size of screen basket is 0.1～10mm, is provided with an agitator in the wherein said stationary screen.
3. treatment process as claimed in claim 1 is characterized in that, the bottom of described worm conveyor is a mesh-like, is provided with one or more washing mouth sprays in the middle.
4. treatment process as claimed in claim 1, it is characterized in that, step 2) earlier mud is put into mud storage stirred pot, added first treatment agent simultaneously and stir, described first treatment agent comprises acid or the alkali of regulating pH value usefulness and the oxygenant that is used for reducing COD; Then mud is transferred to and added water in the mud material-compound tank and regulate concentration of hydraulic mixture, requiring solids content to be controlled at weight percentage is 1%～10%; Again the mud that regulates concentration is carried out composite flocculation.
5. treatment process as claimed in claim 4, it is characterized in that, step 2) specific practice to the mud composite flocculation is: use earlier water dissolution flocculation agent and flocculation agent respectively, after regulating the mud injection slurry reaction jar of concentration, add flocculation agent and flocculant solution respectively, stirred 10～15 minutes.
6. treatment process as claimed in claim 5 is characterized in that, described flocculation agent is polymerize aluminum chloride or poly-ferric chloride, and described flocculation agent is polyacrylamide or diallyl dimethyl ammoniumchloride.
7. treatment process as claimed in claim 1 is characterized in that step 2) in machinery to take off drying method be to utilize vacuum suck method or centrifugal separation or extruding to take off dry method the aqueous solution is deviate from.
8. treatment process as claimed in claim 7 is characterized in that, the equipment that described machinery takes off the drying method employing is selected from: vacuum suck band filter, ceramic plate filter, centrifugal centrifugal dry machine and screw extrusion centrifugal dry machine.
9. treatment process as claimed in claim 1 is characterized in that, described step 3) precipitates the aqueous solution earlier, carries out cascade filtration, smart filter ultrafiltration and two-section type reverse-osmosis treated then successively.
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| PCT/CN2009/000479 WO2010121399A1 (en) | 2009-04-24 | 2009-04-30 | Method and device for treating waste mud |
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