34results about How to "Solve the problem of low removal rate" patented technology

The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.

The invention discloses a VOCs (volatile organic chemicals) low-temperature plasma combined treatment system. The VOCs low-temperature plasma combined treatment system comprises a pretreatment device, a negative ion purifier, a double-medium plasma processor, a high-energy ion processor and a composite catalytic unit, wherein sealed air chambers are arranged in the pretreatment device, the negative ion purifier, the double-medium plasma processor, the high-energy ion processor and the composite catalytic unit respectively; the air chamber of the pretreatment device is sequentially communicated with the air chambers of the negative ion purifier, the double-medium plasma processor, the high-energy ion processor and the composite catalytic unit; the air chamber of the pretreatment device is also communicated with a gas inlet of industrial waste gas VOCs, and the air chamber of the composite catalytic unit is connected with an induced draft fan and is communicated with an exhaust funnel. The VOCs low-temperature plasma combined treatment system can solve the problems the single treatment mode of VOCs in the existing enterprises has low removal rate and can cause secondary pollution.

The invention discloses a production process for denim sewage treatment and pretreatment, and relates to textile technology. The production process organically combines the following four flows: 1, introducing wastewater subjected to pretreatment such as physical sedimentation into a tower biological filter for treatment; 2, performing laser scanning treatment on the sewage for one time; 3, performing ultrasonic treatment on the sewage for one time; and 4, performing ultraviolet irradiation on the sewage for one time; the height of the tower biological filter is reduced greatly; a blast apparatus such as a blast blower is not needed; energy consumption and initial investment are reduced; the main flows of the process treatment are physical treatment flows, the sludge amount is reduced greatly, and the secondary pollution is prevented; and the investment is reduced and the production process is convenient to operate and manage.

The invention discloses a method of low-temperature and low-pressure countercurrently leaching tellurium from copper anode mud. In the invention, according to the solubility of tellurium in a sulfuric acid system, under a low temperature and low pressure condition, the copper anode mud, after water washing, is processed through the processes of performing countercurrent leaching process to controlled-leaching the tellurium, feeding a secondary leaching solution to the primary leaching step, and recycling the copper and tellurium from the primary leaching solution, and ending the process. The method can significantly improves the effect of removing copper and tellurium from the copper anode mud during a pre-treatment process before material feeding in a Kaldo furnace smelting process. On the basis of ensuring copper removal rate, leaching of the tellurium is enhanced, so that the method is more than 99% in copper removal rate and is 70-85% in tellurium removal rate. The method reduces circulating accumulation of the tellurium in the system, reduces or avoids influences of the tellurium on subsequent noble metal recovery, and increases economic benefit of enterprises through centralized treatment.

The invention relates to a method for treating oil refining wastewater. The method comprises the following steps: oil removal, air flotation, a first level biochemical treatment, a second level biochemical treatment, a third level biochemical treatment, and precipitation. A first level biochemical treatment unit is provided with a heat exchanger to reduce temperature of wastewater; a second level biochemical treatment unit is used for nitrogen removal by denitrification; a third level biochemical treatment unit conducts nitration of ammonia nitrogen and removal of pollutants such as residual organic compounds; and a mixed liquor from the third level biochemical treatment unit and the sludge from a precipitation treatment unit flow back to the second level biochemical treatment unit. The invention mainly solves the problem that a refining wastewater treatment facility has low efficiency of ammonia nitrogen removal or even no effect on ammonia nitrogen removal. The process has the advantages of high efficiency of ammonia nitrogen removal and nitrogen removal, high treatment efficiency, strong shock resistance, stable and standard achieved quality of outlet water, and low investment and operation cost.

The invention provides a method and a device for purifying flue gas and controlling smoke plume. The flue gas is deeply purified and the white smoke plume is treated. The device comprises a heterogeneous coring agglomeration reaction system, a flue gas deep purifying system, a flue gas warming reaction system and a heat pump cycling system which are successively arranged along the flowing direction of the flue gas; the heat pump cycling system is connected with the heterogeneous coring agglomeration reaction system and the flue gas warming reaction system through a pipeline; the flue gas is purified by the heterogeneous coring agglomeration reaction system; the flue gas enters the flue gas deep purifying system for further removing fine particulate matters; the flue gas after being deeply purified is heated by the flue gas warming reaction system and then is discharged; the flue gas heat absorbed by the heterogeneous coring agglomeration reaction system exchanges heat with a cooling medium of a heat pump system; a heating medium after being heated is used for increasing the temperature of the flue gas of the flue gas warming reaction system.

The invention discloses a cationic polymer. The structural formula is disclosed as Formula I, wherein m is a natural number ranging from 2888 to 4129 when being number-average polymerization degree, and n is a natural number ranging from 7684 to 27280 when being number-average polymerization degree; and m is a natural number ranging from 4393 to 6397 when being weight-average polymerization degree, and n is a natural number ranging from 11686 to 44601 when being weight-average polymerization degree. The cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention discloses a preparation method of a cationic polymer. The structural formula of the cationic polymer is disclosed as Formula I. The method comprises the following steps: (1) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (2) reacting hexamethyl proguanil with the 3-butenyl-1-sodium alkoxide to obtain a cationic monomer tri(dimethylamino)methyl-3-butenylether hydrochloride disclosed as Formula II; and (3) in the presence of an emulsifier and an initiator, carrying out reversed-phase emulsion polymerization on acrylamide and the tri(dimethylamino)methyl-3-butenylether hydrochloride to obtain the cationic polymer disclosed as Formula I. The cationic polymer prepared by the method can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention relates to a weaving technology, and concretely relates to a denim sewage treatment pretreatment production technology. The technology comprises the following steps: 1, wastewater obtained after physical precipitation and other pretreatment is introduced to a tower biological filter and is treated; 2, the sewage undergoes primary laser scanning treatment; 3, the sewage undergoes primary ultrasonic treatment; and 4, the sewage undergoes primary ultraviolet irradiation. Four flows are organically combined to form one process, so the height of the tower biological filter is greatly reduced; a blower and other blowing devices are not needed, so the energy consumption is reduced, and initial investment is reduced; and the main treatment flow of the technology is a physical treatment flow, so the sludge amount is greatly reduced, secondary pollution is prevented, the investment is reduced, and running management is convenient.

The invention discloses a VOCs waste gas treatment system which comprises a water curtain spray tower, an atomization spray tower, a gas-liquid separator, a plasma generation device and an infrared heating device which are sequentially connected and communicated. The highest removal rate of the VOCs waste gas can reach 90% or above, the problem that an existing waste gas treatment technology cannot meet the continuously-improved emission standard requirement is solved, and emission pollution of the VOCs waste gas to the environment is eliminated; the whole treatment process is simple and easyto operate, high in treatment efficiency, less in required equipment and low in equipment energy consumption, the requirements of modern enterprises for energy conservation, emission reduction and production benefit improvement are well met, and the method has great significance in saving resources and reducing cost.

The invention discloses a method for removing sulfamethazine in a water body. According to the method, a nano zero-valent iron-manganese material is used as an activating agent to activate sulfite to treat the sulfamethazine water body; the nanometer zero-valent iron-manganese material comprises zero-valent iron and zero-valent manganese, and the molar ratio of the zero-valent iron to the zero-valent manganese is (1-4): 1. According to the method for removing the sulfadimidine in the water body, the catalytic activation capability of zero-valent iron on the sulfite is enhanced by adding the zero-valent metal manganese, so that the removal effect of the sulfite on the sulfadimidine is remarkably enhanced, and the removal rate is increased by 10%-20%; the method has the advantages of simple process, short reaction time, good removal effect, wide application range, environmental friendliness and the like, and has very high use value and very good application prospect.

The invention relates to a refining process of polyoxypropylene ether. The refining process comprises the following steps: (1) polymerizing polyoxypropylene ether: polymerizing and reacting hydroxypropyl methacrylate and propylene epoxide under the condition of acidic catalysts; (2) neutralizing a catalyst: adding water and alkali into the polyoxypropylene ether obtained in step (1), and uniformly stirring; (3) adding a seed crystal: adding inorganic salt hydrate as a seed crystal; (4) after the seed crystal in step (3) is added, forming a new crystal nucleus; and (5) filtering: adding a filter aid, and filtering in a pressurizing or vacuumizing manner. The refining process solves the problem in the traditional refining process of the polyoxypropylene ether that the removal rate of the acidic catalyst is not high, improves the purity of the polyoxypropylene ether, and promotes the industrial development.

The invention discloses a direct reduction method and a system of zinc leaching slag. The direct reduction method comprises the steps of drying the zinc leaching slag, so as to obtain dry zinc leaching slag; crushing the dry zinc leaching slag, so as to obtain zinc leaching slag particles; mixing the zinc leaching slag particles with additives and reduction coal, and forming, so as to obtain pellet materials; performing direct reduction on the pellet materials in a direct reduction rotary hearth furnace, so as to obtain smoke which contains zinc, lead, silver and indium and metallized pellets. According to the method, by using preparation and forming processes, the problem of easiness in melting of the pellets is solved, the direct reduction temperature is effectively increased, and the volatilization of zinc, lead, silver and indium is promoted.

The invention discloses a composite material for removing alga-derived odorous substances in black and odorous water, and a preparation method and an application thereof. The composite material is composed of an oxygen releasing agent and an embedding agent. The preparation method comprises the following steps: (1) uniformly mixing the oxygen releasing agent, bentonite, sodium alginate and polyvinyl alcohol according to a certain ratio, adding deionized water, and performing stirring, wherein the oxygen releasing agent is one of calcium peroxide, magnesium peroxide and sodium peroxide; (2) tabletting the obtained mixture in a tabletting machine, and drying the mixture to prepare an oxygen slow-release material for later use; (3) adding a proper amount of potassium ferrate into the black and odorous water, adjusting the pH value, stirring for a reaction, and standing for precipitation; and (4) adding a proper amount of the oxygen slow-release material into the black and odorous water. The composite material has the advantages of reasonable formula, low cost, environmental friendliness, easiness in method implementation, simplicity in operation, effectiveness in absorption and flocculation of various inorganic and organic pollutants in the black and odorous water, inhibition of harmful algae, elimination of peculiar smell, and solving of the problem of insufficient dissolved oxygen in the black and odorous water.

The invention discloses a method for recycling high-salt organic wastewater, and belongs to the technical field of environmental protection. The method comprises a step of oxidizing hydrogen peroxide,wherein the oxidation step sequentially comprises a first stage of adding hydrogen peroxide under a neutral condition, a second stage of carrying out heating and stirring for a reaction under a strong acid condition, and a third stage of adding hydrogen peroxide again under a weak acid condition. According to the invention, the pH is adjusted and the hydrogen peroxide is added in stages accordingto the reaction process in the hydrogen peroxide oxidation process, so that the problem of low removal rate of chemical oxygen demand (COD) in the high-salt organic wastewater is effectively solved,and oxidation efficiency of organic matter in the high-salt organic wastewater is improved.

The invention discloses a tri(dimethylamino)methyl-3-butenylether hydrochloride. The structural formula is disclosed as Formula I. The cationic functional monomer is prepared by the following steps: (1) reacting tetramethylurea with oxalyl chloride to obtain dimethylamino-N,N-dimethylchloromethyleneiminium chloride; (2) reacting dimethyl amine with the dimethylamino-N,N-dimethylchloromethyleneiminium chloride to obtain hexamethyl proguanil; (3) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (4) reacting the hexamethyl proguanil and the 3-butenyl-1-sodium alkoxide to obtain the tri(dimethylamino)methyl-3-butenylether hydrochloride. The multi-claw cationic functional monomer can be used for preparing a cationic polymer; and the cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention belongs to the technical field of sewage treatment, and particularly relates to a device for improving, transforming and intensifying phosphorus removal of rural domestic sewage by using iron shavings. The device comprises an iron shavings filler reaction functional area, the iron shavings filler reaction functional area is provided with a plurality of functional units which are independent from one another and are arranged along a straight line, every two adjacent functional units communicate with each other, each functional unit is filled with iron shaving filler, the iron shaving filler in one functional unit located at one end of the iron shaving filler reaction functional area is connected with a water inlet pipe, the other end of the iron shaving filler reaction functional area is provided with a sludge collection area, the sludge collection area is sunken in the bottom of the iron shaving filler reaction functional area, an aeration system is further arranged in the iron shaving filler reaction functional area and connected with each iron shaving filler, and a water outlet is formed in the side wall of the iron shaving filler reaction functional area. According to the invention, the construction cost is greatly reduced, and great demonstration significance is brought to improvement and reconstruction of agricultural pollution.

The invention relates to a process for cleaning alkali liquor in a spray scrubber tower to effectively remove sulfur trioxide (SO3). An alkali liquor cleaning device is arranged in a spray scrubber tower, and comprises an upper cleaning hole plate and a lower layer cleaning hole plate, the upper and the lower layer cleaning hole plates are obliquely arranged, one end of the upper and the lower layer cleaning hole plates is connected through a steering device, shunting devices are respectively arranged on the other ends of the upper and the lower layer cleaning hole plates, the shutting device on the lower layer is communicated with an alkali liquor tank, the alkali liquor tank is communicated on to the shunting device on the upper layer through a pump to form an alkali liquor circulation loop, the inner portions of the cleaning hole plates are hollow, through holes are arranged on the upper and the lower sides of the cleaning hole plates, exhaust gas removing sulfur dioxide (SO2) goes through the through holes of the cleaning hole plates, and passes through two layers of flowing alkali liquors layers, and the SO3 in the exhaust gas is fully contacted with alkali liquor and reacts with the alkali liquor, thereby removing the SO3. The process for cleaning the alkali liquor in the spray scrubber tower to effectively remove the SO3 aims to achieve low cost and input and high efficiency, simply remoulds a desulfurizing tower in a wet flue gas desulphurization technology, keeps high removal efficiency of the SO2, and improves removal efficiency of the SO3 at the same time.

A low-pressure softened composite nanofiltration membrane comprises a supporting layer and a separation layer stacked on the supporting layer. The supporting layer is an ultrafiltration membrane made of at least one of polyester, polyacrylonitrile, polyvinylidene fluoride, polyether sulfone or polysulfone. The membrane is characterized in that the separation layer is formed by atomizing a water-phase active monomer and an oil-phase active monomer into micro-nano liquid drops in an electrostatic spraying manner, reacting and depositing the micro-nano liquid drops on the supporting layer, the water-phase active monomer is a cationic polyamine, the oil-phase active monomer is an acyl chloride active substance, and an additive is contained in the water-phase active monomer. The invention also discloses a preparation method of the low-pressure softened composite nanofiltration membrane. The problem that a traditional nanofiltration membrane is low in removal rate on hardness ions such as Ca < 2 + > is solved, and meanwhile, the membrane has very high flux and can be used in the fields of household softening, industrial water softening and the like.

The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-efficiency nitrogen and phosphorus removal process for domestic sewage with a low carbon-nitrogen ratio. The process mainly comprises the following steps: S1, pretreating the sewage, and respectively introducing the pretreated sewage into an anaerobic MBR reaction tank and an aerobic MBR reaction tank; S2, respectively introducing the sewage treated by the anaerobic MBR reaction tank into an anaerobic ammonia oxidation reaction tank and an aerobic MBR tank; S3, discharging the sludge generated by the anaerobic MBR reaction tank and the aerobic MBR reaction tank to a sludge digestion tank, wherein part of the sludge treated by the sludge digestion tank flows back into the anaerobic MBRtank through a return pipeline, and the other part flows back into the aerobic MBR tank; and S4, discharging the treated sewage after separating by a sedimentation tank. The treatment method can effectively degrade nitrogen and phosphorus in the domestic sewage with the low carbon-nitrogen ratio, and no additional carbon source is needed.

The invention discloses an application of a polymer as a flocculating agent. The structural formula of the polymer is shown in the formula I in the specification, wherein in the formula I, m is a natural number from 2888 to 4129 when being the number-average degree of polymerization; n is a natural number from 7684 to 27280 when being the number-average degree of polymerization; m is a natural number from 4393 to 6397 when being the weight-average degree of polymerization; n is a natural number from 11686 to 44601 when being the weight-average degree of polymerization; the flocculating agent is used for removing oil in oily sewage. In the application, the cationic polymer has the characteristics of good water solubility, convenience in use and the like, and is especially suitable for solving the problem of low removal rates of emulsified oil and suspended solids in the oily sewage produced in heavy oil fields. Besides, the flocculating agent also has the advantages of small dross production and low content of moisture and high content of oil in dross.

The invention discloses an application of a polymer as a flocculating agent. The structural formula of the polymer is shown in the formula I in the specification, wherein in the formula I, m is a natural number from 2888 to 4129 when being the number-average degree of polymerization; n is a natural number from 7684 to 27280 when being the number-average degree of polymerization; m is a natural number from 4393 to 6397 when being the weight-average degree of polymerization; n is a natural number from 11686 to 44601 when being the weight-average degree of polymerization; the flocculating agent is used for removing oil in oily sewage. In the application, the cationic polymer has the characteristics of good water solubility, convenience in use and the like, and is especially suitable for solving the problem of low removal rates of emulsified oil and suspended solids in the oily sewage produced in heavy oil fields. Besides, the flocculating agent also has the advantages of small dross production and low content of moisture and high content of oil in dross.

The invention discloses a traditional Chinese medicine isatis root residue water treatment agent, and a preparation method and application thereof, and belongs to the technical field of water treatment agents. The problem that existing wastewater and traditional Chinese medicine residues urgently need to be treated is effectively solved. The traditional Chinese medicine isatis root residue water treatment agent is prepared by sequentially carrying out NaOH modification and white-rot fungus fermentation treatment on isatis roots which are decocted with water. The method comprises the followingspecific steps: firstly, decolorizing the traditional Chinese medicine isatis root residues; then adding NaOH into the decolorized isatis root residues to carry out chemical modification; mixing the chemically modified isatis root residues with carbon source and water, cooling, sterilizing, adding white-rot fungi to inoculate, and fermenting; and finally, filtering out a solid from a fermentationproduct, and drying the solid to obtain the water treatment agent. The water treatment agent has the following beneficial effects: the isatis root residues are used as a raw material to prepare a biological adsorbent through a chemical and biological double-treatment method, and the isatis root residues which are Chinese herbal medicine wastes are used for treating wastewater, so that the utilization rate of resources can be effectively improved, and the environmental pollution is reduced.

The invention discloses a preparation method of tri(dimethylamino)methyl-3-butenylether hydrochloride. The structural formula of the cationic functional monomer is disclosed as Formula I. The method comprises the following steps: (1) reacting 3-butenyl-1-ol with sodium hydroxide to obtain 3-butenyl-1-sodium alkoxide; and (2) reacting hexamethyl proguanil with the 3-butenyl-1-sodium alkoxide to obtain the tri(dimethylamino)methyl-3-butenylether hydrochloride. The multi-claw cationic functional monomer prepared by the preparation method can be used for preparing a cationic polymer; and the cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The invention discloses a method for recycling high-salt organic wastewater, which belongs to the technical field of environmental protection. It includes the steps of oxidation with hydrogen peroxide, which sequentially includes the first stage of adding hydrogen peroxide under neutral conditions, the second stage of heating and stirring reaction under strong acid conditions and adding peroxide under weak acid conditions again. The third stage of hydrogen. The invention effectively solves the problem of low removal rate of COD in high-contained organic wastewater and improves the oxidation of organic matter in high-salt organic wastewater by adjusting the pH in stages according to the reaction process and adding hydrogen peroxide in the process of hydrogen peroxide oxidation efficiency.

The invention discloses a coking wastewater comprehensive treatment method comprising the following steps of: pre-treatment, biochemical treatment and deep treatment. The deep treatment step comprises sequential steps of filtering, ultra-filtering, carrying out resin adsorption, re-filtering, and carrying out reverse osmosis. With the adoption of a coking wastewater comprehensive treatment system of the coking wastewater comprehensive treatment method, the pre-treatment step adopts a de-oiling pond, an adjusting pond and an air floating pond, which are connected in sequence; the biochemical treatment step adopts a primary aeration pond, a primary settling pond, an oxygen-poor pond, an aerobic pond and a secondary settling pond, which are connected in sequence; and the deep treatment step adopts a multi-medium filter, an ultra-filtering device, a resin adsorption column and a reverse osmosis device. The coking wastewater comprehensive treatment method has the beneficial effects that the method is stable to operate and has a simple process and good treating effects.

The invention discloses a method of low-temperature and low-pressure countercurrently leaching tellurium from copper anode mud. In the invention, according to the solubility of tellurium in a sulfuric acid system, under a low temperature and low pressure condition, the copper anode mud, after water washing, is processed through the processes of performing countercurrent leaching process to controlled-leaching the tellurium, feeding a secondary leaching solution to the primary leaching step, and recycling the copper and tellurium from the primary leaching solution, and ending the process. The method can significantly improves the effect of removing copper and tellurium from the copper anode mud during a pre-treatment process before material feeding in a Kaldo furnace smelting process. On the basis of ensuring copper removal rate, leaching of the tellurium is enhanced, so that the method is more than 99% in copper removal rate and is 70-85% in tellurium removal rate. The method reduces circulating accumulation of the tellurium in the system, reduces or avoids influences of the tellurium on subsequent noble metal recovery, and increases economic benefit of enterprises through centralized treatment.

The invention provides an eluting agent for repairing Cu, Pb, As combined contaminated soil and a using method thereof. Main compositions of the eluting agent are Twain-80, anionic surfactant and EDTA, wherein the anionic surfactant is one of SDS, SDBS and lauric acid, and volume ratio of the EDTA, the Twain-80 and the anionic surfactant is 1:2:2. The using method comprises the following steps that (1) contaminated soil is screened with water after mixed with the water, sundries and the soil with larger particles are removed; (2) the screened soil is delivered to an eluting pool to be stirredfor 10-12 h and precipitated for 2-4 h, eluting liquid is collected to a recovery system for recycling; (3) the soil after eluted is detected until the detection result is qualified; and (4) the qualified soil after processing is dehydrated and then refilling is carried out. The anionic surfactant and chelating agent are adopted to jointly process the Cu, Pb, As combined contaminated soil, removalrate of Cu, Pb, As in the soil can be improved, and specific effects of the repairing of the Cu, Pb, As combined contaminated soil can be achieved.

The invention discloses a cationic polymer. The structural formula is disclosed as Formula I, wherein m is a natural number ranging from 2888 to 4129 when being number-average polymerization degree, and n is a natural number ranging from 7684 to 27280 when being number-average polymerization degree; and m is a natural number ranging from 4393 to 6397 when being weight-average polymerization degree, and n is a natural number ranging from 11686 to 44601 when being weight-average polymerization degree. The cationic polymer can be used as an organic flocculant, has the characteristics of favorable water solubility and the like, is convenient to use, and is especially suitable for solving the problem of low removal rate of emulsified oil and solid suspended substances in oily sewage produced by heavy oil oilfields. Besides, the flocculant has the advantages of low scum generation amount, and low water content and high oil content in scum.

The present invention discloses a denim sewage treatment and pretreatment method, and relates to textile technology, organically comprising the following steps: 1, introducing wastewater subjected to pretreatment such as physical sedimentation into a tower biological filter for treatment; 2, performing laser scanning treatment on the sewage for one time; 3, performing ultrasonic treatment on the sewage for one time; and 4, performing ultraviolet irradiation on the sewage for one time; the height of the tower biological filter is reduced greatly; a blast apparatus such as a blast blower is not needed; energy consumption and initial investment are reduced; the main flows of the process treatment are physical treatment flows, the sludge amount is reduced greatly, and the secondary pollution is prevented; and the investment is reduced and the production process is convenient to operate and manage.