CN111925782B - Sand-containing polymer-containing oil field waste liquid profile control recycling treatment method - Google Patents
Sand-containing polymer-containing oil field waste liquid profile control recycling treatment method Download PDFInfo
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Abstract
The invention discloses a sand-containing polymer-containing oil field waste liquid profile control recycling treatment method, which comprises the following steps: the first-stage crushing treatment of the sand-containing polymer-containing waste liquid comprises the steps of adopting a colloid crusher to preliminarily crush large colloids in the waste liquid into small-size colloid particles; diluting, namely, after the primary crushing treatment, the waste liquid has extremely high viscosity, enters a stirring tank and is diluted by adding water into the stirring tank; a step of desanding treatment of the waste liquid containing sand and polymer ensures that no sand grains enter a next grinding device; a step of secondary crushing and grinding treatment, wherein the polymer waste liquid after sand removal treatment enters a secondary colloid grinding and crushing device for grinding and crushing treatment; preparing the composite profile control agent. The method can effectively separate sand and glue in the sand-containing polymer-containing waste liquid, and the viscoelastic glue blocks are crushed into the particle plugging agent for recycling, so that the effective utilization of the sand-containing polymer-containing waste liquid is realized.
Description
Technical Field
The invention relates to the field of oilfield waste liquid treatment, in particular to a profile control recycling treatment method for sand-containing polymer-containing oilfield waste liquid.
Background
With the continuous deepening of oil field development work, chemical flooding has become an indispensable important means for winning the stable yield of the oil field in the old area, particularly, polymer flooding with the continuously mature technology is the main power of chemical flooding, the scale of the polymer flooding is continuously enlarged, but the polymer flooding achieves outstanding results, and meanwhile, the problem of treating various waste liquids generated in development and production is increasingly outstanding.
Through investigation and research, the sand-containing and polymer-containing waste liquid of the existing victory oil field mainly has three sources: first, annotate the waste liquid that gathers district well-flushing, operation produced, contain the polymer of certain concentration in this type of waste liquid, contain a large amount of polymer gum piece and indefinite amount oil, mud, sand simultaneously, the polymer gum piece of isolating easily causes environmental pollution, gets into to influence pipe network, quality of water great behind the sewage treatment system, and the jelly influences sewage treatment system's normal operating, causes the regional water injection well water absorbing capacity of recharge to descend. And the waste liquid generated in the operation process of the polymer injection station contains a small amount of polymers and mechanical impurities, and is generally placed in a waste liquid pool of the polymer injection station and cannot be treated. Thirdly, polymer-containing waste liquid is generated after the produced liquid of the polymer injection area is treated in the united station, the waste liquid generally contains a large amount of polymer gel blocks and a large amount of oil sludge sand at the bottom of a settling tank, the oil content is less and the relative content accounts for 4.1%, the solid content of the oil sludge sand accounts for 18.2%, and the waste liquid is mainly cured in a waste liquid tank of the united station due to the fact that random discharge is strictly forbidden at present. In view of the problems of strong pollution of waste liquid in an injection and polymerization area and high treatment difficulty, research on recycling technology is also developed in various oil fields in recent years, but the problems of secondary pollution to the environment or higher treatment cost caused by incomplete treatment exist.
The existing polymer-containing waste liquid treatment method for the Shengli oil field can treat and recycle polymer-containing waste liquid without sand at a single well mouth to prepare a profile control agent to be reinjected to a stratum, thereby achieving the aim of harmless treatment. However, the method is difficult to treat the sand-containing polymer-containing waste liquid, the separation of jelly sand and glue in the sand-containing polymer-containing waste liquid generated in the injection well, the well washing, the operation and the combination station is difficult, when the jelly of the sand-containing polymer is crushed, the inner part of the colloid crushing device is seriously abraded, a cutter needs to be frequently replaced, the treatment cost is high, and the economic and reasonable treatment and utilization are achieved.
In order to meet the requirement of carrying out innocent treatment and recycling on the sand-containing polymer-containing waste liquid, an economical and reasonable treatment method is explored, and the research on the treatment and recycling method of the sand-containing polymer-containing waste liquid is developed. The sand-containing polymer-containing waste liquid is subjected to sand removal and crushing treatment at a single well mouth and then compounded to prepare a profile control agent which is injected back to the stratum, so that the aim of harmless treatment is fulfilled.
Application No.: 201310109093.7 discloses an oil field measure waste liquid skid-mounted treatment device, and belongs to the technical field of oil field measure waste liquid treatment. The device cyclone separation equipment is connected with a micro-electrolysis device, the micro-electrolysis device is connected with an oxidation device, the oxidation device is connected with separation equipment, the separation equipment is connected with plate frame dehydration equipment, chemical medicine equipment is fixed at the top of the oxidation device, the plate frame dehydration equipment is fixed at the left end of the device, and single-screw air compression equipment is connected with the oxidation device through an ejector. The cyclone separation equipment, the micro-electrolysis device, the oxidation device, the separation equipment, the plate frame dehydration equipment and the single-screw air compression equipment are all arranged on a prying device. The invention has the advantages of simple equipment, convenient operation, obvious effect and strong wastewater treatment capability.
Application No.: 201721870728.5 relates to an oil field waste liquid treatment station. Comprises a waste liquid treatment system, a coagulation dosing system and a sewage discharge system which are respectively connected with the waste liquid treatment system; the waste liquid treatment system is of a skid-mounted structure and comprises a waste liquid storage tank, an ozone air flotation and inclined plate coalescence linkage oxidation degreasing pretreatment device, an inclined plate sedimentation device, an adjusting tank, a filtering device and a clear liquid storage tank which are sequentially arranged; the coagulation dosing system comprises a coagulant drug dissolving dosing device, a flocculant drug dissolving dosing device and a regulator drug dissolving dosing device. The invention provides an oil field waste liquid treatment station which is skid-mounted, flexible to move, convenient to transport and install and small in occupied area.
Application No.: 201320744801.X relates to a double prying device for treating oil field waste liquid. Comprises a dosing device, a settling tank, a filtering lift pump and a multi-stage sewage filtering device which are arranged in sequence according to the sewage flow direction; the multistage sewage filtering device comprises a sewage filtering device, a sewage inlet pipe, a sewage outlet pipe and a discharge pipe for discharging filtered waste liquid; the sewage filtering device comprises a filter bag type filter group, a filter element type filter and a control switch for controlling the filter bag type filter group and the filter element type filter which are connected in series; one end of the settling tank is provided with a plate-and-frame filter pressing device; the medicine adding device comprises at least one medicine adding tank and a control switch for controlling the medicine adding tank. The invention provides the oil field waste liquid treatment double-prying device which is low in cost, flexible and changeable in operation and simple in structure.
Application No.: 201310338278.5 discloses a skid-mounted multifunctional integrated oil field water treatment device, which is characterized by comprising a cable winch, a pressure reducing component, a lifting pump, an oil sand liquid separation tank, a coarse treatment tank, a back washing pump, a fine treatment tank, a flow meter, a filter material circulating pump, an air compressor, an air storage tank, an electric control cabinet and a connecting pipe valve which are integrated and then placed on a skid or a vehicle.
Application No.: 201510121407.4 discloses a method and a device for treating polymer-containing waste liquid and fracturing flowback liquid, wherein the method comprises the following steps: 1) Carrying out ultrasonic ozonization treatment on the polymer-containing waste liquid and the fracturing flow-back liquid; 2) Carrying out catalytic oxidation treatment on the waste liquid after ultrasonic ozonization treatment; 3) And carrying out coagulation, precipitation and filtration treatment on the waste liquid after the catalytic oxidation treatment to obtain the liquid meeting the oil field water-based fracturing fluid preparation standard and the reinjection water standard. The device is mainly formed by sequentially connecting an ultrasonic ozonization unit, a catalytic oxidation unit, a dosing unit and a coagulation-precipitation-filtration unit. The treatment method is simple, the device is practical, the dosing system is relatively safe, oil, suspended matters and other harmful substances in water can be efficiently separated under the condition of no filler, and the recycling of waste liquid is ensured.
Application No.: 201110443576.1 relates to a method and a system for treating oil extraction wastewater of a high polymer-containing oil field; performing oil-water separation on the oil field oil extraction wastewater containing the polymer to obtain oil-removed sewage and product oil; mixing the deoiled sewage with a catalyst circulating liquid phase, standing and separating to obtain lower-layer slag-containing water and upper-layer middle effluent; filtering the intermediate effluent to obtain filter residue and final effluent; washing the solid jelly with a small amount of final effluent to obtain a washing solution and washed solid jelly; drying and crushing the washed solid jelly to obtain a product jelly; removing the gel and regenerating to obtain catalyst circulating liquid; the catalyst regeneration cycle of the invention can reduce the catalyst input by more than 90 percent, the slag productization only relates to one treatment agent of acid, thereby greatly reducing the treatment cost, and the water yield in the slag is released and recovered by the treatment of the slag, thereby leading the water yield to reach 100 percent, and avoiding the secondary pollution problem because the slag is converted into a solid gum product.
The method is characterized in that the waste liquid in the oil field is various, the treatment modes of various waste liquids are different, namely the treatment modes of the same waste liquid are different, so that after retrieval, treatment equipment for treating the waste liquid in the oil field and treatment mode publications are various, but the waste liquid in the sand-containing polymer-containing oil field is changed into a brand-new product, such as a profile control agent or a plugging agent, after treatment, the waste liquid is fully reused, and the publication documents do not exist basically, so that the retrieved publication documents do not have any technical inspiration for the application.
The technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The invention aims to provide a sand-containing polymer-containing oil field waste liquid profile control recycling treatment method, which can effectively separate sand and glue in the sand-containing polymer-containing waste liquid, smash viscoelastic glue blocks into particle plugging agents for recycling, and realize effective utilization of the sand-containing polymer-containing waste liquid.
In order to achieve the purpose, the invention adopts the following technical scheme that the sand-containing polymer-containing oil field waste liquid profile control recycling treatment method comprises the following steps:
the method comprises the following steps: the first-stage crushing treatment of the sand-containing polymer-containing waste liquid comprises the steps of primarily crushing large colloid in the waste liquid into small-size colloid particles by a colloid crusher;
step two: diluting, namely, after the primary crushing treatment, the waste liquid has extremely high viscosity, enters a stirring tank, and is diluted by adding water into the stirring tank, so that the viscosity of the waste liquid is diluted to be below 20mPa & s, and the sand is removed by a sand remover;
step three: the sand-containing polymer-containing waste liquid is subjected to desanding treatment by adopting a desanding cyclone separator, and the desander is used for performing cyclone desanding on the diluted sand-containing polymer-containing waste liquid to ensure that no sand grains enter a next grinding device;
step four: a step of secondary crushing and grinding treatment, which is to send the polymer waste liquid after sand removal treatment into a secondary colloid grinding and crushing device for grinding and crushing treatment, and crush the crushed colloid blocks into colloid particles with specified particle size;
step five: and (3) preparing the composite profile control agent, namely conveying the crushed waste liquid containing the polymer particles to a profile control agent preparation tank, namely a profile control agent preparation tank, adding an additive into the preparation tank, uniformly mixing to form the composite profile control agent, and finally injecting the composite profile control agent into a profile control well through an injection pump.
Before the first step, the sources of the sand-containing polymer-containing waste liquid comprise a polymer injection area well washing, the sand-containing polymer-containing waste liquid generated by operation, the sand-containing polymer-containing waste liquid generated by polymer injection station cleaning and the sand-containing polymer-containing waste liquid generated by united station tank cleaning, and the waste liquids are pulled to a water well site for profile control by a tank truck.
In the one-level crushing treatment, the crusher is used for primarily crushing large colloid in the waste liquid into small-size colloid so as to improve the cyclone desanding efficiency. In the technical field, a large colloid generally refers to a colloid block with one of length, width and height being more than 5 cm, and the colloid particles crushed into small size are the colloid particles crushed into small size with length, width and height or with diameter or particle size being less than 5 cm.
During desanding, a proper desander is selected, the desander is a cyclone desander or a cyclone separator, the prior cyclone is comprehensively optimized and selected from the aspect of improving the desanding efficiency, and the cyclone separator capable of effectively removing sand grains in the polymer waste liquid is preferably selected.
In the grinding step, the rubber blocks in the waste liquid are ground into colloid particles with different particle size ranges of 1-4mm, so that the use requirement of the particle plugging agent is met.
In the step of preparing the composite profile control agent, the additives are polyacrylamide and resin cross-linking agent.
The method for compounding the profile control agent comprises the following steps: 0.25 weight part of HPAM aqueous solution, namely polyacrylamide, and 0.18 weight part of resin cross-linking agent are simultaneously put into the waste liquid containing the polymer particles after grinding and crushing treatment, and the composite profile control agent is formed after uniform stirring, wherein the waste liquid containing the polymer particles after grinding and crushing treatment contains 0.3 weight part of crushed colloid particles.
Compared with the prior art, the invention has the following beneficial effects:
the sand-containing polymer-containing waste liquid profile control recycling treatment method is characterized in that the sand-containing polymer-containing waste liquid contains polymer gel blocks and sand, the sand-containing waste liquid is desanded and is converted into a profile control agent for use after the sand-containing waste liquid is desanded by adopting a treatment process of two-stage crushing, so that the purpose of recycling the sand-containing polymer-containing waste liquid is achieved, and the sand-containing polymer-containing waste liquid profile control recycling treatment method mainly comprises a sand-containing polymer-containing waste liquid desanding treatment method and a crushing and grinding treatment method.
The sand-containing polymer-containing waste liquid desanding treatment method comprises the following steps: the sand-containing polymer-containing waste liquid is firstly subjected to crushing treatment by a primary crushing device, large colloid is preliminarily crushed into small-size colloid particles, the crushed waste liquid enters a buffer tank and is added with water to be mixed into fluid with a cyclone desanding condition, and large-size sand grains in the waste liquid are separated by the cyclone desanding device.
The method for crushing and grinding the sand-containing polymer-containing waste liquid comprises the following steps: in the waste liquid got into second grade reducing mechanism after the degritting, further grind the granule stifled agent that smashes into possessing the profile control condition with the viscoelastic colloid in the waste liquid, at last advance to join in marriage waste liquid in the tank and prepare granule stifled agent or gel stifled agent in proportion, pour into in the profile control well to reach and gather the purpose that gathers the whole reinjection stratum of polymer waste liquid, make and gather that the waste liquid is innoxious, recovery recycle, adapt to clean environmental protection development production work demand.
Drawings
FIG. 1 is a flow chart of a treatment method for profile control and recycling of waste liquid of a sand-containing polymer-containing oil field according to the present invention;
FIG. 2 is a connection diagram of the apparatus used in the treatment method for profile control and recycling of waste liquid of a sand-containing polymer-containing oilfield.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to fig. 2, the present invention provides a technical solution:
a profile control recycling treatment method for sand-containing polymer-containing oilfield waste liquid comprises the following steps:
1. and (3) carrying out well washing in the polymer injection area, collecting polymer-containing waste liquid containing sand generated by operation, collecting polymer-containing waste liquid containing sand generated by cleaning in the polymer injection station, and collecting polymer-containing waste liquid containing sand generated by cleaning the tank in the united station by pulling to a water well site for profile control.
2. Primary crushing treatment of the sand-containing polymer-containing waste liquid: the colloid crusher is adopted to crush massive colloid in the waste liquid into small-size colloid preliminarily so as to improve the desanding efficiency of the cyclone desander in the next step and reduce cutter abrasion in the later grinding process. In the technical field, a large colloid generally refers to a colloid block with one of length, width and height being more than 5 cm, and the colloid particles crushed into small size are the colloid particles crushed into small size with length, width and height or with diameter or particle size being less than 5 cm.
3. Dilution treatment: the waste liquid after the first-stage crushing treatment has extremely high viscosity, enters a stirring tank and is diluted by adding water to the viscosity to be below 20 mPa.s, so as to achieve relatively ideal sand removing effect.
4. Desanding treatment of the sand-containing polymer-containing waste liquid: and desanding is carried out by adopting a desanding cyclone separator. The cyclone separator which can effectively remove sand grains in the polymer waste liquid is preferably selected from the angle of improving the desanding efficiency, and the diluted polymer-containing waste liquid is subjected to cyclone desanding to ensure that no sand grains enter the next grinding device.
5. Secondary crushing and grinding treatment: and (3) the polymer waste liquid after sand removal treatment enters a secondary colloid grinding and crushing device for grinding and crushing treatment, and the crushed colloid blocks are crushed into colloid particles with specified particle sizes, such as 1-2mm, 2-3mm and 3-4mm or directly colloid particles with different particle size ranges of 1-4mm, so that the use requirement of the particle plugging agent is met.
6. And conveying the crushed waste liquid containing the polymer particles to a profile control agent preparation tank, namely a profile control agent preparation tank, adding an additive to form a composite profile control agent, and injecting the composite profile control agent into a profile control well through an injection pump. The additive is polyacrylamide and resin cross-linking agent.
The disposal of the waste liquid containing polymer particles and additives in the disposal tank is a conventional disposal method in the art. The method for compounding the profile control agent comprises the following steps: 0.25 parts by weight of an aqueous solution of HPAM, i.e., polyacrylamide, and 0.18 parts by weight of a resin crosslinking agent were simultaneously put into a ground and pulverized polymer particle-containing waste liquid containing 0.3 parts by weight of pulverized colloidal particles, and the mixture was uniformly stirred to obtain a composite profile control agent.
A crusher: for one-level colloid breaker, adopt special vertical colloid breaker, inside uses multiunit cutter combination, and the upper cutter adopts shear type cutter, can be broken high viscoelastic polymer rubber powder, and lower floor's cutter adopts abrasive type cutter, with the preliminary broken small-size colloidal particle of becoming of bold colloid, improves whirl desander degritting efficiency, reduces the cutter wearing and tearing in the later stage grinding process.
Adding a water pump: the sand-containing polymer-containing waste liquid after the primary treatment has extremely high viscosity and can not be directly treated, and a water pump is adopted to add water for dilution.
A stirring pump: adopt the agitator pump, will add the primary treatment waste liquid stirring of water dilution, guarantee the desanding effect.
Axial-flow pump: and conveying the sand-containing polymer-containing waste liquid subjected to the primary treatment to a desander.
A sand remover: and desanding is carried out by adopting a desanding cyclone separator.
Certainly, in order to better improve the desanding efficiency, the selection method of the type of the desander can adopt the following scheme, the cyclone separation process of sand colloid is researched by means of a numerical simulation technology, the separation performance of the cyclone is calculated and analyzed, the type of the existing cyclone is comprehensively optimized from the angle of improving the desanding efficiency, sand grains in waste liquid are effectively removed, and no sand grains enter the grinding device.
Grinder or grinder pump: second grade colloid reducing mechanism adopts vertical structure, uses multilayer cutter combination, and upper cutter adopts shearing type cutter, can be broken high viscoelastic polymer rubber powder, and lower floor's cutter adopts grinding type cutter, can grind the micelle of smashing to certain particle diameter with broken gluey piece.
A filter: and further filtering the treated waste liquid to remove impurities.
All the components are conventional in the technical field and can be directly connected for use.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A profile control recycling treatment method for sand-containing polymer-containing oilfield waste liquid is characterized by comprising the following steps:
step 1, carrying out well washing in a polymer injection area, carrying out operation to generate sand-containing polymer-containing waste liquid, carrying out cleaning in a polymer injection station to generate sand-containing polymer-containing waste liquid, and carrying out pulling transportation on the sand-containing polymer-containing waste liquid generated by tank cleaning in a united station to a water well site for profile control;
step 2, primary crushing treatment of the sand-containing polymer-containing waste liquid: the method comprises the following steps of (1) primarily crushing large colloid in waste liquid into small-size colloid by using a colloid crusher, wherein the large colloid refers to colloid blocks with one of length, width and height being more than 5 cm, and the small-size colloid particles obtained by crushing the large colloid into small-size colloid particles with the length, width and height or the diameter or the particle size being less than 5 cm;
and step 3, dilution treatment: the waste liquid after the first-stage crushing treatment has extremely high viscosity, enters a stirring tank and is diluted by adding water to the viscosity to be below 20 mPa.s, so as to achieve relatively ideal sand removing effect.
Step 4, desanding treatment of the sand-containing polymer-containing waste liquid: carrying out cyclone desanding on the diluted polymer-containing waste liquid by using a cyclone separator to ensure that no sand grains enter a next grinding device;
step 5, secondary crushing and grinding treatment: the polymer waste liquid after desanding treatment enters a secondary colloid grinding and crushing device for grinding and crushing treatment, and crushed colloid blocks are crushed into colloid particles with different particle size ranges of 1-4mm, so that the use requirement of the particle plugging agent is met;
step 6, conveying the crushed waste liquid containing the polymer particles to a plugging agent preparation tank, adding an additive to form a composite profile control agent, and injecting the composite profile control agent into a profile control well through an injection pump;
the preparation method of the composite profile control agent comprises the following steps: putting 0.25 weight part of HPAM aqueous solution, namely polyacrylamide and 0.18 weight part of resin cross-linking agent into the ground and crushed waste liquid containing the polymer particles simultaneously, and uniformly stirring to form the composite profile control agent, wherein the ground and crushed waste liquid containing the polymer particles contains 0.3 weight part of crushed colloid particles;
the crusher is a primary colloid crushing device, a special vertical colloid crusher is adopted, a plurality of groups of cutters are combined in the crusher, the upper layer cutter adopts a shearing cutter to crush the high-viscoelasticity polymer rubber powder, the lower layer cutter adopts a grinding cutter to preliminarily crush large colloid into small-size colloid particles, the desanding efficiency of the cyclone desander is improved, and the cutter abrasion in the later grinding process is reduced;
adding water into the sand-containing polymer-containing waste liquid subjected to primary treatment for dilution, uniformly stirring, and conveying to a cyclone separator for desanding;
the grinding machine or the grinding pump is a two-stage colloid crushing device, adopts a vertical structure, applies a multi-layer cutter combination, adopts a shearing type cutter for an upper layer cutter, can crush high-viscoelasticity polymer rubber powder, adopts a grinding type cutter for a lower layer cutter, grinds crushed rubber blocks into colloidal particles with certain particle size, filters and removes impurities.
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| CN102583812A (en) * | 2011-12-27 | 2012-07-18 | 欧派斯环保科技（北京）有限公司 | Method and system for treating polymer-containing oil field oil production wastewater |
| CN102925131A (en) * | 2012-10-30 | 2013-02-13 | 中国石油化工股份有限公司 | Method for preparing polymer injection fluid from clear water and polymer-containing sewage |
| CN104533361A (en) * | 2014-12-15 | 2015-04-22 | 中国石油天然气股份有限公司 | Recovery and reuse method of polymer flooding well return |
| CN106089154A (en) * | 2016-08-08 | 2016-11-09 | 中国石油化工股份有限公司 | The device of collected polymer from the waste liquid containing polymer |
| CN106957642A (en) * | 2016-11-28 | 2017-07-18 | 青岛科技大学 | Polymer waste recycles technique in a kind of preparation from suspended prop |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102583812A (en) * | 2011-12-27 | 2012-07-18 | 欧派斯环保科技（北京）有限公司 | Method and system for treating polymer-containing oil field oil production wastewater |
| CN102925131A (en) * | 2012-10-30 | 2013-02-13 | 中国石油化工股份有限公司 | Method for preparing polymer injection fluid from clear water and polymer-containing sewage |
| CN104533361A (en) * | 2014-12-15 | 2015-04-22 | 中国石油天然气股份有限公司 | Recovery and reuse method of polymer flooding well return |
| CN106089154A (en) * | 2016-08-08 | 2016-11-09 | 中国石油化工股份有限公司 | The device of collected polymer from the waste liquid containing polymer |
| CN106957642A (en) * | 2016-11-28 | 2017-07-18 | 青岛科技大学 | Polymer waste recycles technique in a kind of preparation from suspended prop |
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