CN113087234A - Advanced treatment method for acrylic fiber wastewater - Google Patents
Advanced treatment method for acrylic fiber wastewater Download PDFInfo
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- CN113087234A CN113087234A CN201911335608.9A CN201911335608A CN113087234A CN 113087234 A CN113087234 A CN 113087234A CN 201911335608 A CN201911335608 A CN 201911335608A CN 113087234 A CN113087234 A CN 113087234A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 135
- 229920002972 Acrylic fiber Polymers 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000002211 ultraviolet spectrum Methods 0.000 claims abstract description 14
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 13
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 9
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 9
- 238000005189 flocculation Methods 0.000 claims abstract description 8
- 230000016615 flocculation Effects 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims abstract description 8
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 38
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 30
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 30
- 239000004571 lime Substances 0.000 claims description 30
- 239000008267 milk Substances 0.000 claims description 30
- 210000004080 milk Anatomy 0.000 claims description 30
- 235000013336 milk Nutrition 0.000 claims description 30
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 4
- 229910002567 K2S2O8 Inorganic materials 0.000 claims description 2
- 229910004882 Na2S2O8 Inorganic materials 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 21
- 239000000243 solution Substances 0.000 description 20
- 230000014759 maintenance of location Effects 0.000 description 16
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 7
- 230000035484 reaction time Effects 0.000 description 7
- 238000009287 sand filtration Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 244000005700 microbiome Species 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 239000007952 growth promoter Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007380 fibre production Methods 0.000 description 2
- 239000002068 microbial inoculum Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010505 homolytic fission reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- -1 persulfate ions Chemical class 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000011272 standard treatment Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
Abstract
The invention discloses an advanced treatment method of acrylic fiber wastewater, which comprises the following steps: (1) performing advanced treatment on the acrylic fiber wastewater under the action of persulfate and ultraviolet spectrum; (2) adding calcium hydroxide into the material treated in the step (1) to enable the material to be turbid due to the fact that the polymer contained in the material is gathered into tiny particles; (3) performing flocculation sedimentation treatment on the material obtained in the step (2); (4) and (4) filtering the material in the step (3) and then discharging the acrylic fiber wastewater reaching the standard. The method can efficiently, conveniently and low-cost treat the acrylic fiber wastewater and realize the standard discharge of the wastewater.
Description
Technical Field
The invention relates to an advanced treatment method of acrylic fiber wastewater, in particular to an advanced treatment method of acrylic fiber wastewater after secondary biochemical treatment.
Technical Field
The biochemical effluent of the acrylic fiber wastewater contains low polymers, and the low polymers have high stability and are difficult to degrade. At present, the refractory wastewater is generally treated by combining a physicochemical method including an advanced oxidation method and a biochemical method. Besides advanced oxidation, the physical and chemical method also comprises coagulation, air flotation, ultrafiltration, microfiltration, adsorption pretreatment and the like; the biological method comprises an SBR process, a biological contact oxidation method, a biological filter tower and the like.
CN201510635146.8 discloses a method for treating waste water generated in acrylic fiber production, the acrylic fiber waste water passes through an anaerobic hydrolysis-aerobic oxidation system-a denitrification unit in sequence, two substances, a reagent-a microorganism growth promoter and a microbial inoculum, are added into the anaerobic hydrolysis unit, the heterotrophic nitrification-aerobic denitrification bacteria are added, and the aerobic contact oxidation unit is added with another denitrification bacteria; the growth promoter consists of polyamine, salt, organic hydroxylamine acid, etc. in the weight ratio of 40-100 salt, 5-30 polyamine and 0.5-15 organic hydroxylamine acid, and the salt is metal salt and is the mixture of calcium salt, copper salt, magnesium salt and/or ferrous salt. In this patent, the microbial inoculum dosage is lower, has solved the difficult degradation's of cyanide wastewater problem with microorganism growth promoter combined action to and the problem that nitrogenous pollutant wherein can not the standard treatment, realizes simultaneously that COD and nitrogenous pollutant's high efficiency is got rid of.
CN201810654437.5 discloses a treatment process for acrylic fiber wastewater, which mainly comprises the following steps: in order to decompose the biochemical COD, firstly, microorganisms are adopted for treatment, and the microorganisms exist in an activated carbon system; activated carbon adsorption in the non-biodegradable COD; after the activated carbon is adsorbed and saturated, the activated carbon is regenerated through a specific system; after the regeneration is completed, the activated carbon can be continuously used in the original system.
CN201820977407.3 invented a waste water treatment device, can be used to the removal of acrylic fibre waste water, through three process flows, biological activated carbon system, two heavy ponds, active carbon regeneration system, reached the target of waste water treatment. The three systems are arranged in sequence, and a solid-liquid mixture in the biological activated carbon system can overflow into the secondary sedimentation tank to realize solid-liquid separation; the sludge separated by precipitation partially reflows through a backflow pipe to be reused, and the waste sludge enters an active carbon regeneration system for treatment; the regenerated active carbon returns to the biological active carbon system through a regenerated carbon sludge pipeline for recycling.
CN201410447725.5 protects a process for treating acrylic fiber wastewater, wherein wastewater generated in the acrylic fiber production process is taken, pretreated and subjected to electrodialysis separation to obtain two kinds of wastewater, namely organic wastewater with extremely low salt content and high-concentration brine with extremely low organic content; after the first wastewater is subjected to advanced oxidation treatment, a small amount of COD is removed, the biodegradability of the wastewater is improved, the wastewater is subjected to A/O biological treatment and discharged to reach the standard, the latter high-salinity concentrated water is subjected to reverse osmosis treatment to obtain pure water for reuse in production, and the rest reverse osmosis concentrated water is further concentrated by the second set of electrodialysis; the process combines advanced oxidation and biological treatment technologies and also combines a membrane separation technology, so that the substances which are difficult to biodegrade and the macromolecular organic matters which are difficult to naturally settle in the wastewater are successfully treated, the treated wastewater is recycled, and the reclamation of the wastewater is really realized.
CN201610991407.4 discloses an acrylic fiber waste water treatment process, in the process, firstly, the acrylic fiber waste water is filtered by sand filtration, the SS of the filtered effluent is less than 30mg/L, then, the waste water enters an ozone oxidation system, an ozone catalyst is used in the system, aromatic hydrocarbons in the waste water are degraded into short-chain aliphatic hydrocarbons, finally, the COD in the waste water is further removed by BAF, the BAF has another function, the SS can be further removed by adsorption filtration, and the effluent quality is stable.
CN201510010373.1 relates to a set of wastewater treatment system, which can be used for the treatment of acrylic fiber wastewater, wherein the wastewater is filtered by a regulating unit, an air flotation unit, an ozone oxidation precipitation unit, an anaerobic reaction unit, an aerobic contact oxidation unit, a secondary sedimentation tank and a sand filter; the air floatation tank consists of a sand collecting area, a sludge area, a mixing area and a separation area, wherein the separation area consists of a water collecting area and a slag collecting area; the aeration mixing area and the sedimentation area are two main parts of an ozone oxidation sedimentation unit, and the anoxic anaerobic reaction tank is divided into three parts, namely a facultative section, an anoxic section and an anaerobic section, by baffle plates; the aerobic contact oxidation device consists of a water inlet pipe, a water distribution triangular cone, a filler and an aeration regulation system; the regulating unit regulates and controls the water quantity and the water quality of the wastewater, then the wastewater enters the enhanced air flotation tank for deslagging, then the pollutants are oxidized through the ozone oxidation and precipitation unit, the biodegradability is improved, then the subsequent processes are used for anoxic, anaerobic and aerobic treatment, and the wastewater reaches the emission standard after precipitation and filtration.
The treatment of acrylic fiber wastewater is a problem acknowledged in the industry, the method has the general problems of high operation cost, complex process and the like, and the development of a novel method for advanced treatment of acrylic fiber wastewater with low cost and simple flow has extremely important significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the advanced treatment method of the acrylic fiber wastewater, which can treat the acrylic fiber wastewater efficiently, conveniently and low in cost and realize the standard discharge of the wastewater.
An advanced treatment method of acrylic fiber wastewater comprises the following steps:
(1) performing advanced treatment on the acrylic fiber wastewater under the action of persulfate and ultraviolet spectrum;
(2) adding calcium hydroxide into the material treated in the step (1) to ensure that the material contains polymers
The particles are aggregated into tiny particles and become turbid;
(3) performing flocculation sedimentation treatment on the material obtained in the step (2);
(4) and (4) filtering the material in the step (3) and then discharging the acrylic fiber wastewater reaching the standard.
In the step (1), the acrylic fiber wastewater is subjected to secondary biochemical treatment, and has COD of 60-300 mg/L, TOC of 30-150 mg/L and BOD50 to 10mg/L, preferably 100 to 250mg/L of COD, 50 to 120mg/L of TOC, BOD5Is 0 to 5 mg/L.
In the step (1), persulfate is firstly added into the acrylic fiber wastewater, and then the acrylic fiber wastewater is irradiated by adopting an ultraviolet spectrum, preferably an ultraviolet spectrum at least comprising vacuum ultraviolet.
In the step (1), the wavelength range of the ultraviolet spectrum is 10-380 nm. In the step (1), at least an ultraviolet spectrum with the wavelength of 10-380 nm is adopted, preferably 100-300 nm, and further preferably 180-260 nm; the ultraviolet spectrum light source is arranged in the acrylic fiber wastewater added with persulfate so as to carry out effective radiation on the acrylic fiber wastewater added with persulfate.
In the step (1) of the method, the concentration of the persulfate in the acrylic fiber wastewater is 0.01-3 g/L,
preferably 0.01 to 1g/L, and more preferably 0.01 to 0.5 g/L; the treatment temperature is 0-70 ℃, preferably 15-60 ℃, and further preferably 20-30 ℃; the treatment time is 5-180 minutesPreferably 10 to 120min, and more preferably 10 to 60 min. Said persulfates include, but are not limited to, K2S2O8Or Na2S2O8At least one of (1).
In the step (2) of the method, calcium hydroxide is added into the material treated in the step (1) to ensure that the concentration of the calcium hydroxide in the wastewater is 0.01-0.2 g/L, and the mixture is stirred uniformly; the stirring speed is 5-200 r/m, preferably 10-100 r/m, and more preferably 20-40 r/m; the stirring time is 10-120min, preferably 15-80 min, and further preferably 15-40 min. For example, 100g/L lime milk is added to 1L of the material, and the addition amount of the lime milk is between 0.1 and 2ml, preferably between 0.1 and 1ml, and further preferably between 0.1 and 0.5 ml.
In the step (3), the flocculation settling treatment may be performed by a conventional technique, or may be performed by the following method: firstly, sequentially adding lime milk, polymeric ferric sulfate and polyacrylamide solution into the material obtained in the step (2) under the condition of stirring, and then standing and settling. For example, 2-6 ml of lime milk (concentration 100 g/L) is added into each liter of material in sequence, then 1-5 ml of polymeric ferric sulfate (concentration 38 g/L) solution is added, finally 0.5-3 ml of polyacrylamide solution (concentration 1 g/L) is added, and then standing and settling are carried out for 10-30 min.
In the step (4), the filtration is performed by high density pond filtration and/or sand filtration.
In the method, the acrylic fiber wastewater is subjected to advanced treatment under the action of persulfate and ultraviolet spectrum
The solution is transparent, and the COD value of the wastewater is generally reduced by a mode of adsorbing organic matters by activated carbon, but the inventor surprisingly discovers through research that the addition of calcium hydroxide after the advanced treatment of persulfate and ultraviolet spectrum of the acrylic fiber wastewater can promote organic polymers in the wastewater to aggregate into particles, and the COD value can be removed through simple flocculation and filtration. Through further research, the inventor finds that persulfate ions are subjected to homolytic cleavage under ultraviolet irradiation and form sulfate radicals, the sulfate radicals can attack CN triple bonds of acrylic fibers, and C or N in the CN triple bonds after bond breaking can perform addition reaction with the sulfate radicals to generate C1- SO4 -And N-SO4 -The bond makes the polymer have the particles formed by spontaneous agglomeration to form stable particles under the action of some chemical agents, such as alkaline calcium hydroxide emulsion (lime milk).
Drawings
FIG. 1 is a schematic view of the advanced treatment of acrylic fiber wastewater in the embodiment of the invention.
Detailed Description
The following examples and comparative examples are given to further illustrate the action and effect of the method of the present invention, but the following examples are not intended to limit the method of the present invention.
Example 1
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 201 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.15g/L, the light source is a UV light source, the emitted ultraviolet light is ordinary ultraviolet light with the wavelength of 254nm and 365nm, the power of the light source is 30W, the reaction time is 25min, after the reaction is finished, the COD of the waste water is almost unchanged, 0.23ml of lime milk is added into the treated waste water, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 20min, and the stirring speed is 20 r/m; after stable turbid liquid is formed, adding 4ml of lime milk with the concentration of 100g/L again, stirring for 2min at the rotating speed of 200r/min, then adding 1.4ml of polyferric sulfate (38 g/L) solution, stirring for 2min at the rotating speed of 200r/min, finally adding 2ml (1 g/L) of polyacrylamide solution, stirring for 10min at the rotating speed of 40r/min, standing and settling for 20min, filtering wastewater by a high-density tank (the retention time is 20 min), and after sand filtration (the retention time is 20 min), wherein COD is 27 mg/L finally, so that the emission standard lower than 30mg/L is achieved.
Example 2
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 183 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the wastewater is 0.1g/L, the light source is a UV light source, the emitted ultraviolet light is ordinary ultraviolet light with the wavelength of 254nm and 365nm, the power of the light source is 30W, and the reaction is carried outThe time is 20min, after the reaction is finished, the COD of the wastewater is almost unchanged, 0.22ml of lime milk is added into the treated wastewater, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 24min, and the stirring speed is 35 r/m; after a stable turbid liquid is formed, adding 4.5ml of lime milk with the concentration of 100g/L again, stirring for 2min at the rotating speed of 200r/min, then adding 1.4ml of polyferric sulfate (38 g/L) solution, stirring for 2min at the rotating speed of 200r/min, finally adding 2ml (1 g/L) of polyacrylamide solution, stirring for 10min at the rotating speed of 40r/min, standing and settling for 20min, filtering wastewater by a high-density tank (the retention time is 20 min), filtering the wastewater by sand (the retention time is 20 min), and finally obtaining the COD (chemical oxygen demand) of 25 mg/L, so that the emission standard of lower than 30mg/L is achieved.
Example 3
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein COD is 165 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.12g/L, the light source is a UV light source, the emitted ultraviolet light is ordinary ultraviolet light with 254nm and 365nm, the power of the light source is 30W, the reaction time is 23min, after the reaction is finished, the COD of the waste water is almost unchanged, 0.31ml of lime milk is added into the treated waste water, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 20min, and the stirring speed is 30 r/m; after a stable turbid liquid is formed, adding 4.5ml of lime milk with the concentration of 100g/L again, stirring for 2min at the rotating speed of 200r/min, then adding 1.4ml of polyferric sulfate (38 g/L) solution, stirring for 2min at the rotating speed of 200r/min, finally adding 2ml (1 g/L) of polyacrylamide solution, stirring for 10min at the rotating speed of 40r/min, standing and settling for 20min, filtering wastewater by a high-density tank (the retention time is 20 min), filtering the wastewater by sand (the retention time is 20 min), and finally obtaining the COD (chemical oxygen demand) of 20mg/L, so that the emission standard of lower than 30mg/L is achieved.
Example 4
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 147 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.11g/L, the light source is a UV light source, and the emitted ultraviolet light is ordinary ultraviolet light of 254nm and 365nmThe light source power is 30W, the reaction time is 30min, the COD of the wastewater is almost unchanged after the reaction is finished, 0.26ml of lime milk is added into the treated wastewater, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 20min, and the stirring speed is 35 r/m; after a stable turbid liquid is formed, 5.5ml of lime milk with the concentration of 100g/L is added again, stirring is carried out for 2min at the rotating speed of 200r/min, 1.4ml of polyferric sulfate (38 g/L) solution is added, stirring is carried out for 2min at the rotating speed of 200r/min, finally 2ml (1 g/L) of polyacrylamide solution is added, stirring is carried out for 10min at the rotating speed of 40r/min, standing and settling are carried out for 20min, the waste water is filtered by a high-density tank (the retention time is 20 min), the COD is finally 17 mg/L after sand filtration (the retention time is 20 min), and the discharge standard lower than 30mg/L is achieved.
Example 5
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 179 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.23g/L, the light source is a UV light source, the emitted ultraviolet light is ordinary ultraviolet light with 254nm and 365nm, the power of the light source is 30W, the reaction time is 21min, after the reaction is finished, the COD of the waste water is almost unchanged, 0.24ml of lime milk is added into the treated waste water, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 18min, and the stirring speed is 20 r/m; after a stable turbid liquid is formed, adding 3.5ml of lime milk with the concentration of 100g/L again, stirring for 2min at the rotating speed of 200r/min, then adding 2.9ml of polyferric sulfate (38 g/L) solution, stirring for 2min at the rotating speed of 200r/min, finally adding 2ml (1 g/L) of polyacrylamide solution, stirring for 10min at the rotating speed of 40r/min, standing and settling for 20min, filtering wastewater by a high-density tank (the retention time is 20 min), filtering the wastewater by sand (the retention time is 20 min), and finally obtaining the COD (chemical oxygen demand) of 15 mg/L, so that the emission standard of lower than 30mg/L is achieved.
Example 6
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein COD is 168 mg/L and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.16g/L, the light source is a UV light source, and the emitted ultraviolet light is 254Common ultraviolet light of nm and 365nm, the light source power is 30W, the reaction time is 18min, after the reaction is finished, the COD of the wastewater is almost unchanged, 0.23ml of lime milk is added into the treated wastewater, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 27min, and the stirring speed is 40 r/m; after stable turbid liquid is formed, 5ml of lime milk with the concentration of 100g/L is added again, stirring is carried out for 2min at the rotating speed of 200r/min, then 3ml of polymeric ferric sulfate (38 g/L) solution is added, stirring is carried out for 2min at the rotating speed of 200r/min, finally 2ml (1 g/L) of polyacrylamide solution is added, stirring is carried out for 10min at the rotating speed of 40r/min, standing and settling are carried out for 20min, the waste water is filtered by a high-density tank (the retention time is 20 min), the COD is finally 23 mg/L after sand filtration (the retention time is 20 min), and the emission standard lower than 30mg/L is achieved.
Example 7
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 156 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.27g/L, the light source is a UV light source, the emitted ultraviolet light is ordinary ultraviolet light with the wavelength of 254nm and 365nm, the power of the light source is 30W, the reaction time is 24min, after the reaction is finished, the COD of the waste water is almost unchanged, 0.18ml of lime milk is added into the treated waste water, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 15min, and the stirring speed is 25 r/m; after a stable turbid liquid is formed, adding 4ml of lime milk with the concentration of 100g/L again, stirring for 2min at the rotating speed of 200r/min, then adding 2ml of polyferric sulfate (38 g/L) solution, stirring for 2min at the rotating speed of 200r/min, finally adding 2ml (1 g/L) of polyacrylamide solution, stirring for 10min at the rotating speed of 40r/min, standing and settling for 20min, filtering wastewater by a high-density tank (the retention time is 20 min), and after sand filtration (the retention time is 20 min), the COD is 27 mg/L finally, so that the emission standard lower than 30mg/L is achieved.
Example 8
Taking biochemical effluent of an acrylic fiber factory as a treatment target, taking 1L of wastewater, wherein the COD of the wastewater is 149 mg/L, and the temperature is 25 ℃; the wastewater enters a UV irradiation system, wherein Na is added into the wastewater2S2O8The concentration of the waste water is 0.18g/L, the light source is a UV light source, and the light is emittedThe ultraviolet light is ordinary ultraviolet light of 254nm and 365nm, the light source power is 30W, the reaction time is 27min, after the reaction is finished, the COD of the wastewater is almost unchanged, 0.31ml of lime milk is added into the treated wastewater, the concentration of the lime milk is 100g/L, the mixture is fully stirred for 36min, and the stirring speed is 30 r/m; after stable turbid liquid is formed, 5ml of lime milk with the concentration of 100g/L is added again, stirring is carried out for 2min at the rotating speed of 200r/min, 1.9ml of polyferric sulfate (38 g/L) solution is added, stirring is carried out for 2min at the rotating speed of 200r/min, finally 2ml (1 g/L) of polyacrylamide solution is added, stirring is carried out for 10min at the rotating speed of 40r/min, standing and settling are carried out for 20min, the waste water is filtered by a high-density tank (the retention time is 20 min), the COD is finally 19 mg/L after sand filtration (the retention time is 20 min), and the emission standard lower than 30mg/L is achieved.
Comparative example 1
Na was not added to the wastewater in example 12S2O8And other conditions are unchanged, the COD of the wastewater is 160 mg/L, the COD cannot be effectively removed by the flocculation method, and the wastewater cannot reach the discharge standard.
Comparative example 2
In example 1, no turbid liquid forming process is performed, other conditions are unchanged, COD in the wastewater is 165 mg/L, the COD cannot be effectively removed by a flocculation method, and the wastewater cannot reach the discharge standard.
Claims (10)
1. An advanced treatment method of acrylic fiber wastewater is characterized in that: the method comprises the following steps:
performing advanced treatment on the acrylic fiber wastewater under the action of persulfate and ultraviolet spectrum;
adding calcium hydroxide into the material treated in the step (1) to ensure that the material contains polymers
The particles are aggregated into tiny particles and become turbid;
performing flocculation sedimentation treatment on the material obtained in the step (2);
and (4) filtering the material in the step (3) and then discharging the acrylic fiber wastewater reaching the standard.
2. The method of claim 1, wherein: in the step (1), the acrylic fiber wastewater is acrylic fiber wastewater subjected to secondary biochemical treatment.
3. The method of claim 2, wherein: the COD of the acrylic fiber wastewater is 60-300 mg/L, the TOC is 30-150 mg/L, and the BOD5Is 0 to 10 mg/L.
4. The method of claim 1, wherein: in the step (1), firstly persulfate is added into the acrylic fiber wastewater, and then the acrylic fiber wastewater is irradiated by adopting an ultraviolet spectrum, preferably an ultraviolet spectrum at least comprising vacuum ultraviolet.
5. The method of claim 1, wherein: in the step (1), the wavelength range of the ultraviolet spectrum is 10-380 nm.
6. The method of claim 1, wherein: in the step (1), at least an ultraviolet spectrum with the wavelength of 10-380 nm is adopted.
7. The method of claim 1, wherein: in the step (1), the concentration of the persulfate in the acrylic fiber wastewater is 0.01-3 g/L; the treatment temperature is 0-70 ℃; the treatment time is 5-180 minutes.
8. The method of claim 7, wherein: said persulfates include, but are not limited to, K2S2O8Or Na2S2O8At least one of (1).
9. The method of claim 1, wherein: in the step (2), adding calcium hydroxide into the material treated in the step (1) to ensure that the concentration of the calcium hydroxide in the wastewater is 0.01-0.2 g/L, and uniformly stirring; the stirring speed is 5 to 200 r/m.
10. The method of claim 1, wherein: in the step (3), the flocculation sedimentation treatment adopts the following method: firstly, sequentially adding lime milk, polymeric ferric sulfate and polyacrylamide solution into the material obtained in the step (2) under the condition of stirring, and then standing and settling.
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