CN104609601A - Treatment method for quickly clarifying oilfield produced water through micro-sand circulation - Google Patents
Treatment method for quickly clarifying oilfield produced water through micro-sand circulation Download PDFInfo
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- CN104609601A CN104609601A CN201510040432.XA CN201510040432A CN104609601A CN 104609601 A CN104609601 A CN 104609601A CN 201510040432 A CN201510040432 A CN 201510040432A CN 104609601 A CN104609601 A CN 104609601A
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Abstract
The invention relates to the technical field of treatment methods for oilfield produced water, in particular to a treatment method for quickly clarifying oilfield produced water through micro-sand circulation. The method comprises the following steps: firstly, separating floating oil from the oilfield produced water in a de-oiling device to obtain mixed liquor; secondly, pumping the mixed liquor in the de-oiling device into a coagulating basin through a lifting pump, adding a coagulant into the coagulating basin, and stirring uniformly to obtain first suspension, wherein the concentration of the coagulant in the first suspension is 30-50 mg/L and the first suspension enters a sand-adding tank. Compared with an existing treatment process for the oilfield produced water, the treatment method for quickly clarifying the oilfield produced water through the micro-sand circulation has the characteristics that the treatment capacity of the oilfield produced water is high, the treatment efficiency is high, the quality of purified water is good, the dosages of the coagulant and a coagulant aid are reduced, the discharge amount of water oil sludge is reduced, and the soil pollution is alleviated; meanwhile, micro-sand is high in separation efficiency and can be recycled, so that the production cost is reduced.
Description
Technical field
the present invention relates to method for treating water cut out from oil field technical field, is a kind of micro-sand circulation High-speed clarification method for treating water cut out from oil field.
Background technology
oil field produced water treatment system is the important component part of oilfield surface engineering facility, is the important content of field produces operational management.Current domestic each oil field, according to respective recovered water different in kind, defines the Treatment Techniques of Extracted Water from Crude Oil Production that comparative maturity shows unique characteristics, and substantially achieves the resource utilization application that the process re-injection of oil field extracted water, qualified discharge and reuse injection-steam boiler feed water.
it is as follows that oil field at home commonly uses produced water disposal technical process:
1) reuse oil-field flooding technical process has following several: 1. recovered water → gravity oil-removing → coagulant precipitation → filter → go water-injection plant; 2. recovered water → gravity oil-removing → air supporting select → filter → remove water-injection plant; 3. recovered water → gravity oil-removing → cyclonic separation → filter → go water-injection plant; 4. recovered water → water-and-oil separator → (adding emulsion splitter) → hydrocyclone → water filling (U.K. North Sea ULa oil field); 5. recovered water → primary oil water separator → secondary water-and-oil separator → air supporting → water filling (the northern oil field of Kuwait); Reuse oil-field flooding technical process 1. domestic and international application accounts for more than 50%, and 2. flow process is applied and accounted for 30%, and the application of all the other flow processs accounts for 20%.
2) technical process of reuse heavy oil development wet steam generator has following several: 1. recovered water pre-treatment → cascade filtration → ion-exchange → remove heating plant; 2. recovered water pre-treatment → stripping tower desulfurization → lime soften for sewage → cascade filtration ion-exchange → reuse boiler; The pre-treatment of reuse heavy oil development wet steam generator technical process recovered water is mainly coagulant precipitation and gas flotation process, and coagulant precipitation domestic and international application accounts for more than 70%, and flow process gas flotation applications accounts for 30%.
coagulant precipitation art breading effect quality depends on that factor is a lot; Screening Water purification medicament whether satisfy the need, recovered water temperature, oil field produced oil-in-water and suspension content, unstable ion content, salinity height etc.; And the flco usually formed is little and loose, settlement separate difficulty.The key of therefore produced water disposal technology and core are to solve a settling of floccus difficult problem.
the process of oil field at home recovered water coagulant precipitation is commonly used solution and is mainly contained: add excessive flocculation agent and coagulant aids, add positively charged particulate matter (as wilkinite), water quality modification technology (feeding lime) etc., as:
publication number is that the Chinese patent literature of CN101050008A discloses a kind of method for treating water cut out from oil field, it is characterized in that: the first step adds heavy nucleus agent, and second step adds catalyzer, and the 3rd step adds water purification agent, and the 4th step adds coagulant aids and obtains water purification.
publication number is that the Chinese patent literature of CN101254959A discloses a kind of bentonite sewage water treating method, it is characterized in that: calcium base or sodium base or Acidic Bentonite are ground into 10 order to 600 orders, pour in treatment sewage and stir, again by the octadecyl trimethyl ammonium chloride of 24%, pour in sewage, stir, pour flocculation agent into again, stir, sedimentation, carries out water and soil separation, microbiological treatment, qualified discharge.
publication number is that the Chinese patent literature of CN101016181A discloses the agent of a kind of silt coagulation and silt coagulation separation method, it is characterized in that each component of getting coagulation agent by the proportioning of coagulation agent, and be mixed with solution, ferric-polysilicate solution is added successively in the silt of process, sodium carbonate solution, polyacrylamide solution, and carry out stirring generation turbulent fluctuation, mix 0.5min under flow turbulence effect after, water will be separated with silt flocs unit, the suspension bed sediment of a large amount of high densitys occurred in silt engineering can be assembled sedimentation rapidly and utilized, reach the object improving sediment usage rate.
publication number is that the Chinese patent literature of CN102531123A discloses a kind of micro-sand synergy caked flocculation integrated water quality purification device, for city water process.This equipment for core, by adding micro-sand as carrier, improves conglomeration volume density with caking flocculation technology further, and strengthening caking flocculation, to the decontamination effect improving of low-cloudy water, achieves the high-efficient purification to algae blooms water.This equipment provides two kinds of different rotating speeds drive reaction stir shaft respectively and be separated stir shaft by internal wheel engagement by same drive-motor, is separated, improves the integrated level of main equipment for caking flocculation with silt particle; In main equipment, realize silt particle be separated simultaneously.
publication number is that the Chinese patent literature of CN201510784U discloses a kind of micro-sand circulation efficient precipitation device, and this device is used for city tap-water factory.Comprise coagulation district, flocculation zone, tube settling district, water outlet distributing flue, in described coagulation district built with the first stirrer, this utility model also comprises micro-sand recycle system, and this micro-sand recycle system comprises sludge refluxing apparatus, hydro-cyclone splitter, discharger and sediment outflow pipe.
although oil field produced water treatment achieves good effect at present on oil field, but still Shortcomings, the chemical feeding quantity of coagulating agent and coagulant aids is large, by product band water greasy filth amount after process is large, by product band water greasy filth common method is carried out burying process by band water greasy filth, causes certain pollution to soil; And the water purification water quality inferiority obtained.
Summary of the invention
the invention provides a kind of micro-sand circulation High-speed clarification method for treating water cut out from oil field, overcome the deficiency of above-mentioned prior art, it effectively can solve existing treatment Technology for Petroleum Water Flooding, and to there is the chemical feeding quantity of coagulating agent and coagulant aids large, the problem of the large and water purification water quality inferiority of the by product band water greasy filth amount after process.
technical scheme of the present invention is realized by following measures: a kind of micro-sand circulation High-speed clarification method for treating water cut out from oil field, carry out as follows: the first step, oil field extracted water obtains mixed solution be separated oil slick in oil removal plant after, second step, mixed solution in oil removal plant enters in coagulation basin through lift pump, in coagulation basin, add coagulating agent and stir and obtain the first suspension, the concentration of coagulating agent in the first suspension is 30mg/L to 50mg/L, first suspension enters and adds Sha Chizhong, add sand stir and obtain the second suspension in a subtle way adding Sha Chizhong, the concentration of micro-sand in the second suspension is 5g/L to 15g/L, second suspension enters educates Hua Chizhong, add coagulant aids and stir and obtain the 3rd suspension educating Hua Chizhong, the concentration of coagulant aids in the 3rd suspension is 1.5mg/L to 2mg/L, 3rd suspension enters in settling tank and precipitates, supernatant liquor in precipitation final settling tanks is discharged by the top of settling tank and is obtained water purification, 3rd step, the throw out in precipitation final settling tanks enters in mixing tank through sludge pump, adds solvating agent in a mixer and stir to obtain mixture, and solvating agent concentration is in the mixture 2mg/L to 5mg/L, 4th step, mixture enters in silt particle tripping device and is separated, and obtain micro-sand and band water greasy filth after separation respectively, the micro-sand after separation adds Sha Chizhong, and the band water greasy filth after separation is discharged.
here is the further optimization and/or improvements to foregoing invention technical scheme:
above-mentioned coagulating agent is polymerize aluminum chloride.
above-mentioned coagulant aids is polyacrylamide.
above-mentioned solvating agent is diesel oil.
in above-mentioned oil field extracted water, oleaginousness is 500mg/L to 1000mg/L, and in oil field extracted water, suspended substance is 250mg/L to 300mg/L.
in above-mentioned water purification, the content of suspended substance is 8mg/L to 10mg/L, and the content of clean oil-in-water is 5mg/L to 10mg/L.
above-mentioned settling tank is tube settler, and the liquid level load of settling tank is 15m
3
/ m
2
h to 25m
3
/ m
2
h.
the particle diameter of above-mentioned micro-sand is 80 μm to 120 μm; Or/and oleaginousness is 150mg/L to 250mg/L in the mixed solution in oil removal plant, in the mixed solution in oil removal plant, the content of suspended substance is 100mg/L to 150mg/L.
stir speed (S.S.) in above-mentioned coagulation basin is 210r/min to 230r/min, and churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) added in sand pond is 210r/min to 230r/min, and churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) in educating pond is 210r/min to 230r/min, churning time is 3.0min to 5.0min.
above-mentioned oil removal plant is oil removing pot or oil trap; Or/and silt particle tripping device is hydrocyclone.
the more existing treatment Technology for Petroleum Water Flooding of the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field, oil field extracted water treatment capacity is large, processing efficiency is high, the water quality of water purification is good, reduce the chemical feeding quantity of coagulating agent and coagulant aids, decrease the quantity discharged of band water greasy filth, reduce pollution to soil; Simultaneously the separation efficiency of micro-sand is high and can recycle, reduces production cost.
Accompanying drawing explanation
accompanying drawing 1 is process flow diagram of the present invention.
Embodiment
the present invention by the restriction of following embodiment, can not determine concrete embodiment according to technical scheme of the present invention and practical situation.
in the present invention, for convenience of description, the description of the relative position relation of each parts is all be described according to the Butut mode of Figure of description 1, as: the position relationship of forward and backward, upper and lower, left and right etc. determines according to the Butut direction of Figure of description 1.
below in conjunction with embodiment and accompanying drawing, the invention will be further described:
embodiment 1, as shown in Figure 1, this micro-sand circulation High-speed clarification method for treating water cut out from oil field, carry out as follows: the first step, oil field extracted water obtains mixed solution be separated oil slick in oil removal plant after, second step, mixed solution in oil removal plant enters in coagulation basin through lift pump, in coagulation basin, add coagulating agent and stir and obtain the first suspension, the concentration of coagulating agent in the first suspension is 30mg/L to 50mg/L, first suspension enters and adds Sha Chizhong, add sand stir and obtain the second suspension in a subtle way adding Sha Chizhong, the concentration of micro-sand in the second suspension is 5g/L to 15g/L, second suspension enters educates Hua Chizhong, add coagulant aids and stir and obtain the 3rd suspension educating Hua Chizhong, the concentration of coagulant aids in the 3rd suspension is 1.5mg/L to 2mg/L, 3rd suspension enters in settling tank and precipitates, supernatant liquor in precipitation final settling tanks is discharged by the top of settling tank and is obtained water purification, 3rd step, the throw out in precipitation final settling tanks enters in mixing tank through sludge pump, adds solvating agent in a mixer and stir to obtain mixture, and solvating agent concentration is in the mixture 2mg/L to 5mg/L, 4th step, mixture enters in silt particle tripping device and is separated, and obtain micro-sand and band water greasy filth after separation respectively, the micro-sand after separation adds Sha Chizhong, and the band water greasy filth after separation is discharged.Like this, micro-sand can strengthen oil field extracted water flocculation sediment effect, improves effluent quality, add micro-sand as heavy nucleus, the formation of induction of flocculation body, and then flocs unit particle is shot up, considerably increase the density of flocs unit simultaneously, accelerate the settling velocity of flocs unit; The oil field extracted water treatment capacity of the more existing treatment Technology for Petroleum Water Flooding of oil field extracted water treatment capacity of the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field on average doubles; The present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field decreases 30% to 50% by coagulating agent after adding micro-sand and the more existing treatment Technology for Petroleum Water Flooding coagulating agent of chemical feeding quantity of coagulant aids and the chemical feeding quantity of coagulant aids, the band water greasy filth that the more existing treatment Technology for Petroleum Water Flooding of the band water greasy filth that the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field produces produces decreases 1/3, thus decreases band water greasy filth to the pollution of soil; And the separation efficiency of micro-sand on average can reach 95%, micro-sand can recycle, reduces production cost.
embodiment 2, as shown in Figure 1, this micro-sand circulation High-speed clarification method for treating water cut out from oil field, carry out as follows: the first step, oil field extracted water obtains mixed solution be separated oil slick in oil removal plant after, second step, mixed solution in oil removal plant enters in coagulation basin through lift pump, in coagulation basin, add coagulating agent and stir and obtain the first suspension, the concentration of coagulating agent in the first suspension is 30mg/L or 50mg/L, first suspension enters and adds Sha Chizhong, add sand stir and obtain the second suspension in a subtle way adding Sha Chizhong, the concentration of micro-sand in the second suspension is 5g/L or 15g/L, second suspension enters educates Hua Chizhong, add coagulant aids and stir and obtain the 3rd suspension educating Hua Chizhong, the concentration of coagulant aids in the 3rd suspension is 1.5mg/L or 2mg/L, 3rd suspension enters in settling tank and precipitates, supernatant liquor in precipitation final settling tanks is discharged by the top of settling tank and is obtained water purification, 3rd step, the throw out in precipitation final settling tanks enters in mixing tank through sludge pump, adds solvating agent in a mixer and stir to obtain mixture, and solvating agent concentration is in the mixture 2mg/L or 5mg/L, 4th step, mixture enters in silt particle tripping device and is separated, and obtain micro-sand and band water greasy filth after separation respectively, the micro-sand after separation adds Sha Chizhong, and the band water greasy filth after separation is discharged.
embodiment 3, as the optimization of above-described embodiment, coagulating agent is polymerize aluminum chloride.Polymerize aluminum chloride can better compress colloid diffusion layer, in and electric charge, micro-wadding particle shape is become, add positively charged micro-sand again, in and colloid electrical, and as the absorption heavy core of micro-wadding grain, make the flco reacting rear formation closely knit, settling velocity is fast, thus realizes oil field extracted water fast purification.
embodiment 4, as the optimization of above-described embodiment, coagulant aids is polyacrylamide.Add polyacrylamide educating Hua Chizhong, make to form large and loose flco alumen ustum in the 3rd suspension, the formation large and loose flco alumen ustum of formation is combined more closely knit with micro-sand, and proportion is larger.
embodiment 5, as the optimization of above-described embodiment, solvating agent is diesel oil.Diesel oil makes oil from micro-sand sur-face peeling, then enters in silt particle tripping device, is convenient to micro-sand and is with water greasy filth more easily separated, make the not contaminated recycle of micro-sand.
embodiment 6, as the optimization of above-described embodiment, in oil field extracted water, oleaginousness is 500mg/L to 1000mg/L, and in oil field extracted water, suspended substance is 250mg/L to 300mg/L.In oil field extracted water, oil-containing exists with oil slick, dispersed oil, oil in water emulsion and dissolving oil form; In oil field extracted water, suspended solids exists with shale, opaque and chiltern form.
embodiment 7, as the optimization of above-described embodiment, in water purification, the content of suspended substance is 8mg/L to 10mg/L, and the content of clean oil-in-water is 5mg/L to 10mg/L.In the water purification that existing treatment Technology for Petroleum Water Flooding obtains, the content of suspended substance is 20mg/L to 25mg/L, and in water purification, oleaginousness is 20mg/L to 25mg/L; Illustrate that the water quality of the water purification that the more existing treatment Technology for Petroleum Water Flooding of water purification that the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field obtains obtains improves a lot.
embodiment 8, as the optimization of above-described embodiment, settling tank is tube settler, and the liquid level load of settling tank is 15m
3
/ m
2
h to 25m
3
/ m
2
h.Alumen ustum flco in educating pond after micro-sand increases the weight of enters tube settler, the closely knit alumen ustum of major part before the inclined tube entering tube settler with regard under rapid precipitation, the little flco alumen ustum of small part is through inclined tube, utilize the shallow pool principle of inclined tube, multiple impacts, coalescent, grow up, final settlement is got off, and the alumen ustum that micro-sand increases the weight of and mud mix, be collected bottom settling tank, and extracted out from bottom by sludge pump.In the existing treatment Technology for Petroleum Water Flooding of identical scale, the liquid level load of settling tank is 9m
3
/ m
2
h to 11m
3
/ m
2
h, illustrate that the treatment capacity of the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field is large, processing efficiency is high.
embodiment 9, as the optimization of above-described embodiment, the particle diameter of micro-sand is 80 μm to 120 μm; Or/and oleaginousness is 150mg/L to 250mg/L in the mixed solution in oil removal plant, in the mixed solution in oil removal plant, the content of suspended substance is 100mg/L to 150mg/L.Like this, when the particle diameter of micro-sand is 80 μm to 120 μm, effects of purification quality is better, and micro-sand grains footpath is too small or be excessively mostly unfavorable for settling of floccus; In mixed solution in oil removal plant, oil-containing is mainly based on oil in water emulsion and dissolving oil, and in the mixed solution in oil removal plant, suspended substance is mainly based on opaque and shale suspended solid, the stable in properties of this kind of material, and proportion, close to water, cannot be separated by natural subsidence.
embodiment 10, as the optimization of above-described embodiment, the stir speed (S.S.) in coagulation basin is 210r/min to 230r/min, and churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) added in sand pond is 210r/min to 230r/min, and churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) in educating pond is 210r/min to 230r/min, churning time is 3.0min to 5.0min.
embodiment 11, as the optimization of above-described embodiment, oil removal plant is oil removing pot or oil trap; Or/and silt particle tripping device is hydrocyclone.In oil field extracted water, oil-containing exists with oil slick, dispersed oil, oil in water emulsion and dissolving oil form; In oil field extracted water, suspended solids exists with shale, opaque and chiltern form; Oil slick, dispersed oil are separated with chiltern suspended solid can be removed by gravity natural subsidence, and this part pollution substance adopts oil removing pot or oil trap to remove through gravity natural separation usually.Mixture is sent to hydrocyclone, under centrifugal action, make lighter band water greasy filth and the higher micro-sand of density separated, micro-sand is discharged bottom hydrocyclone, is rejoined and adds in sand pond, re-uses.The band water greasy filth that density is lighter is discharged from the top of hydrocyclone.
in sum, the more existing treatment Technology for Petroleum Water Flooding of the present invention's micro-sand circulation High-speed clarification method for treating water cut out from oil field, oil field extracted water treatment capacity is large, processing efficiency is high, the water quality of water purification is good, reduce the chemical feeding quantity of coagulating agent and coagulant aids, decrease the quantity discharged of band water greasy filth, reduce pollution to soil; Simultaneously the separation efficiency of micro-sand is high and can recycle, reduces production cost.
above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations.
Claims (10)
1. a micro-sand circulation High-speed clarification method for treating water cut out from oil field, it is characterized in that carrying out as follows: the first step, oil field extracted water obtains mixed solution be separated oil slick in oil removal plant after, second step, mixed solution in oil removal plant enters in coagulation basin through lift pump, in coagulation basin, add coagulating agent and stir and obtain the first suspension, the concentration of coagulating agent in the first suspension is 30mg/L to 50mg/L, first suspension enters and adds Sha Chizhong, add sand stir and obtain the second suspension in a subtle way adding Sha Chizhong, the concentration of micro-sand in the second suspension is 5g/L to 15g/L, second suspension enters educates Hua Chizhong, add coagulant aids and stir and obtain the 3rd suspension educating Hua Chizhong, the concentration of coagulant aids in the 3rd suspension is 1.5mg/L to 2mg/L, 3rd suspension enters in settling tank and precipitates, supernatant liquor in precipitation final settling tanks is discharged by the top of settling tank and is obtained water purification, 3rd step, the throw out in precipitation final settling tanks enters in mixing tank through sludge pump, adds solvating agent in a mixer and stir to obtain mixture, and solvating agent concentration is in the mixture 2mg/L to 5mg/L, 4th step, mixture enters in silt particle tripping device and is separated, and obtain micro-sand and band water greasy filth after separation respectively, the micro-sand after separation adds Sha Chizhong, and the band water greasy filth after separation is discharged.
2. micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1, is characterized in that coagulating agent is polymerize aluminum chloride.
3. micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 and 2, is characterized in that coagulant aids is polyacrylamide.
4. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3, is characterized in that solvating agent is diesel oil.
5. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4, it is characterized in that in oil field extracted water, oleaginousness is 500mg/L to 1000mg/L, in oil field extracted water, suspended substance is 250mg/L to 300mg/L.
6. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that in water purification, the content of suspended substance is 8mg/L to 10mg/L, the content of clean oil-in-water is 5mg/L to 10mg/L.
7. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that settling tank is tube settler, the liquid level load of settling tank is 15m
3/ m
2h to 25m
3/ m
2h.
8. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, is characterized in that the particle diameter of micro-sand is 80 μm to 120 μm; Or/and oleaginousness is 150mg/L to 250mg/L in the mixed solution in oil removal plant, in the mixed solution in oil removal plant, the content of suspended substance is 100mg/L to 150mg/L.
9. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, it is characterized in that the stir speed (S.S.) in coagulation basin is 210r/min to 230r/min, churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) added in sand pond is 210r/min to 230r/min, and churning time is 2.0min to 3.0min; Or/and the stir speed (S.S.) in educating pond is 210r/min to 230r/min, churning time is 3.0min to 5.0min.
10. the micro-sand circulation High-speed clarification method for treating water cut out from oil field according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, is characterized in that oil removal plant is oil removing pot or oil trap; Or/and silt particle tripping device is hydrocyclone.
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| CN104944552A (en) * | 2015-07-03 | 2015-09-30 | 江苏省环境科学研究院 | Flocculent precipitate water processing method adopting slag or abrasive blasting scrap as micro sand |
| CN104961266A (en) * | 2015-07-06 | 2015-10-07 | 新疆石油勘察设计研究院（有限公司） | Mud-sand separation cyclic utilization apparatus |
| CN112159018A (en) * | 2020-09-25 | 2021-01-01 | 中国石油天然气股份有限公司 | Pretreatment method for emulsified produced water containing oil and alcohol in gas field |
| CN116986769A (en) * | 2023-09-06 | 2023-11-03 | 上海世尼环保技术有限公司 | Micro-sand ballast precipitation device with deep oil removal function |
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| CN116986769B (en) * | 2023-09-06 | 2024-05-17 | 上海世尼环保技术有限公司 | Micro-sand ballast precipitation device with deep oil removal function |
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| CN104609601B (en) | 2016-09-14 |
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