CN111003845A - System and process for treating alkaline waste liquid in viscose fiber production - Google Patents
System and process for treating alkaline waste liquid in viscose fiber production Download PDFInfo
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- CN111003845A CN111003845A CN201911365318.9A CN201911365318A CN111003845A CN 111003845 A CN111003845 A CN 111003845A CN 201911365318 A CN201911365318 A CN 201911365318A CN 111003845 A CN111003845 A CN 111003845A
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- 239000007788 liquid Substances 0.000 title claims abstract description 89
- 239000002699 waste material Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229920000297 Rayon Polymers 0.000 title claims abstract description 34
- 238000007380 fibre production Methods 0.000 title claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 43
- 230000002378 acidificating effect Effects 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims description 76
- 239000000872 buffer Substances 0.000 claims description 39
- 239000002253 acid Substances 0.000 claims description 29
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000006386 neutralization reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 13
- 239000000706 filtrate Substances 0.000 claims description 11
- 239000012295 chemical reaction liquid Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000012065 filter cake Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 229920002678 cellulose Polymers 0.000 description 11
- 239000001913 cellulose Substances 0.000 description 11
- 229920002488 Hemicellulose Polymers 0.000 description 10
- 239000003513 alkali Substances 0.000 description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 239000002585 base Substances 0.000 description 7
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- 239000000126 substance Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- USAIOOFEIMNEDN-UHFFFAOYSA-L disodium;carbonotrithioate Chemical compound [Na+].[Na+].[S-]C([S-])=S USAIOOFEIMNEDN-UHFFFAOYSA-L 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 description 3
- XDDWTKNHOVUZBU-UHFFFAOYSA-L disodium;methanethioate Chemical compound [Na+].[Na+].[O-]C([S-])=S XDDWTKNHOVUZBU-UHFFFAOYSA-L 0.000 description 3
- 239000008394 flocculating agent Substances 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000007832 Na2SO4 Substances 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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- 238000009530 blood pressure measurement Methods 0.000 description 2
- QGJOPFRUJISHPQ-UHFFFAOYSA-N carbon disulfide Substances S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 2
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- 239000003292 glue Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004383 yellowing Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
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- 230000004151 fermentation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011535 reaction buffer Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention discloses a system and a process for treating alkaline waste liquid in viscose fiber production, and belongs to the technical field of viscose fiber production. According to the invention, through the arrangement of the alkaline waste liquid treatment system, the acidic waste water generated in the viscose fiber production is neutralized, so that on one hand, after the waste liquid is treated, the environmental pollution is reduced; on the other hand, the waste liquid can be recycled after being pretreated, so that the waste is changed into valuable, the sustainable development is promoted, meanwhile, the automatic control of the treatment process is realized, and the stability and controllability of the treatment of the alkaline waste liquid are improved.
Description
Technical Field
The invention relates to a waste liquid treatment system and a process, in particular to a system and a process for treating alkaline waste liquid in viscose fiber production, and belongs to the technical field of viscose fiber production.
Background
Viscose is a regenerated fiber with excellent performance comparable to natural fiber and synthetic fiber, and mainly comprises the following components in the production process: the method comprises the following steps of alkali cellulose manufacturing, yellowing, glue making, spinning, plasticizing and stretching, cutting, refining, drying, packaging and the like, wherein a large amount of alkali wastewater (containing substances such as cellulose sulfonate, sodium hydroxide, carbon disulfide, alpha-cellulose, hemicellulose, sodium carbonate, sodium trithiocarbonate, sodium dithiocarbonate, sodium thiosulfate and the like) is generated in the glue making, spinning, filter washing and other steps, and the alkali wastewater constitutes a main source of wastewater COD (chemical oxygen demand), so that the removal of the alkali wastewater COD is also an environmental protection problem which needs to be solved urgently at present.
At present, a sedimentation method, a bacterial degradation method, an oxidative degradation method and the like are mainly adopted for treating alkaline wastewater in viscose fiber production, but because a large amount of cellulose sulfonate, hemicellulose and the like contained in the alkaline wastewater are dissolved under alkaline conditions, the removal difficulty is high and the speed is low by adopting the sedimentation method; if the bacterial degradation method and the oxidative degradation method are directly adopted, the consumption of the needed bacteria, oxidant and the like is huge.
The publication numbers "CN 207468369U, CN 107827278A" disclose that the acid-base neutralization device, the reaction tank and the filter press are connected in sequence, the acid-base neutralization device is connected with an alkaline waste water collecting tank and a plasticized water collecting tank, the reaction tank is provided with a flocculating agent preparation tank, and the flocculating agent preparation tank is provided with a flocculating agent inlet and an activated carbon inlet. The high-concentration alkaline wastewater is treated by combining acid-base neutralization, flocculation and filter pressing, on one hand, the COD content of the high-concentration alkaline wastewater with the COD content of about 50000mg/L can be reduced to 1300-1600mg/L, and then the high-concentration alkaline wastewater is sent to an environmental protection process for degradation treatment, so that the environmental protection pressure is reduced, on the other hand, the waste residue obtained by filter pressing can be directly sent to a power department for incineration after being discharged, so that the energy cost is saved. However, in this embodiment, CS is generated by the neutralization reaction in the reaction tank2、H2S, etc., but are not further processed in the processing device, and are directly processedThe discharge will affect the environmental pollution, and meanwhile, the pressure change in the reaction tank is affected, and unstable factors will be generated to the working condition environment; in addition, the equipment and procedure control cost in the process system is increased due to the arrangement of the acid-base neutralization equipment of the static mixer.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a system and a process for treating alkaline waste liquid in viscose fiber production. In the technical scheme, the acidic waste water generated in the production of viscose fibers is used for neutralizing the generated alkaline waste liquid, so that the environmental pollution is reduced after the waste liquid is treated; on the other hand, the waste liquid can be recycled after being pretreated, so that the waste is changed into valuable, and the sustainable development is promoted.
In order to achieve the technical purpose, the following technical scheme is proposed:
a system for treating alkaline waste liquid in viscose fiber production comprises a collecting tank for collecting and storing alkaline waste liquid, a reaction tank for carrying out neutralization reaction, a buffer tank for buffering flow and a filter press for carrying out solid-liquid separation on solution, wherein a discharge port of the collecting tank is connected with a feed port of the reaction tank through a conveying pipe I, a discharge port of the reaction tank is connected with a feed port of the buffer tank through a conveying pipe II, a feed port of the buffer tank is connected with a feed port of the filter press through a conveying pipe III, the conveying pipe I is provided with a feed pump and an automatic alkali liquor adding valve, the conveying pipe II is provided with a material pouring pump I and an automatic material pouring valve, and the conveying pipe III;
an acid wastewater tank for collecting and storing acid wastewater generated by spinning, plasticizing, stretching and the like is arranged in the viscose production, the reaction tank is connected with the acid wastewater tank through an acid conveying pipe, and an acid adding liquid automatic valve is arranged on the acid conveying pipe;
the conveying pipe II is communicated with a circulating pipe, one end of the circulating pipe is connected with the conveying pipe II, the other end of the circulating pipe is connected with a circulating port of the reaction tank, a circulating automatic valve is arranged on the circulating pipe, and the circulating pipe is arranged to promote complete acid-base neutralization reaction in the reaction tank and improve the efficiency of alkaline waste liquid treatment;
the reaction tank and the buffer tank are connected with a waste gas recovery device through exhaust pipes, and automatic recovery valves are arranged on the exhaust pipes.
Furthermore, be equipped with liquid level changer I on the accumulator tank for the liquid level change in the monitoring accumulator tank.
Furthermore, the feeding pumps are at least two, and the feeding pumps are connected in parallel.
Furthermore, a stirring mechanism driven by a motor is arranged in the reaction tank, and a pH detector and a liquid level transmitter II are arranged on the reaction tank.
Furthermore, the reaction tanks are at least two, and are connected in parallel.
Furthermore, the buffer tanks are at least two, and the buffer tanks are connected with each other in a parallel mode. The buffer tank increases the buffer capacity of the reaction, and the buffer tank needs time for the reaction.
Furthermore, a liquid level transmitter III is arranged on the buffer tank.
Furthermore, the material pouring pumps II are at least two and are connected in parallel.
Further, the filter press is a membrane filter press in the prior mature technology and is directly purchased and obtained.
According to actual requirements, each pipeline is provided with a manual valve; the exhaust pipe is provided with a pressure detector and a fan; the related pipeline is acid and alkali resistant.
A process for treating alkaline waste liquid in viscose fiber production specifically comprises the following steps:
1) collecting alkaline waste liquid generated in the production of viscose fibers, and temporarily storing the alkaline waste liquid in a collecting tank;
2) conveying the alkaline waste liquid in the collecting tank to the reaction tank at a feeding flow rate of 10-20L/s, and simultaneously conveying the acidic waste water in the acidic waste water tank to the reaction tank at a feeding flow rate of 10-20L/s; in a reaction tank, carrying out neutralization reaction on the alkaline waste liquid and the acidic waste water to obtain a reaction liquid with the pH value of 3.5-5.5;
3) feeding the reaction solution obtained in the step 2) at a feed flow rate of 20m3H, conveying to a buffer tank, buffering and temporarily storing;
4）the reaction liquid in the buffer tank is fed at a flow rate of 32m3And h, conveying to a filter press, performing filter pressing by the filter press to obtain a filter cake and filtrate with the pH of 3.5-5.5, and respectively recovering and treating.
Further, the alkaline waste liquid is alkaline waste liquid containing substances such as cellulose sulfonate, sodium hydroxide, carbon disulfide, alpha-cellulose, hemicellulose, sodium carbonate, sodium trithiocarbonate, sodium dithiocarbonate and sodium thiosulfate, wherein COD is 15000mg/L, SS is 8000mg/L, and the concentration of the sodium hydroxide is 15 g/L.
Further, in the reaction tank, the rotating speed of a stirring mechanism is 10 r/min; and controlling the pressure in the reaction tank to be less than 0Mbar and the temperature to be less than or equal to 60 ℃.
Furthermore, in the filter press, the inlet pressure is 3-8bar and the temperature is less than 60 ℃.
Further, the filtrate comprises Na2SO4And Zn2SO4The filter residue comprises hemicellulose and cellulose.
In the reaction tank, the main reactions involved are: h++OH-=H2O；
The side reactions involved are:
[C6H9O5]n+nNaOH+nCS2→[C6H9O4▪OCS2Na]n，5NaOH+3CS2=2Na2CS3+NaHCO3+2H2o, wherein OH-After consumption, a large amount of CS2Discharging; at the same time, Na2CS3+6OH-=Na2CO3+3H2S, a large number of H2S gas is discharged; CO 23 2-+2H+=CO2+H2O。
For the alkaline waste liquid treatment process, the related working principle is as follows:
[C6H9O5]n+nNaOH+nCS2→[C6H9O4▪OCS2Na]the main reaction of yellowing of n is a reversible reaction, [ C ]6H9O4▪OCS2Na]n is alkali soluble and difficult to reduceThe decomposed reducing substances cause high COD in the discharged water; acid addition (acid wastewater) consumes OH-After the reaction, [ C ]6H9O5]n solid (cellulose, alkali-soluble, acid-insoluble) and nCS2(gas, exhaust) is generated in large quantities; at the same time, because the hemicellulose does not react with CS2Reaction during which [ C ] is6H9O4▪OCS2Na]n wrapping the semi-fiber to form large particles, and reacting to obtain [ C ]6H9O4▪OCS2Na]Breaking the n wrapping layer and separating out hemicellulose; finally, a filter cake (hemicellulose, cellulose, sand and other insoluble solid impurities) and a filtrate (containing Na) are obtained2SO4、Zn2SO4Etc. acidic liquids).
By adopting the technical scheme, the beneficial technical effects brought are as follows:
1) in the invention, the acidic waste water generated by spinning, plasticizing and stretching and the like in the production of viscose fiber is used for neutralizing the generated alkaline waste liquid, so that the environmental pollution is reduced after the waste liquid is treated; on the other hand, the waste liquid can be recycled after being pretreated, so that the waste is changed into valuable, and the sustainable development is promoted;
2) in the treatment system, the collection tank, the reaction tank, the buffer tank, the filter press, the pipeline, the pump, the automatic valve and the like are arranged, so that the automatic control of the alkaline waste liquid treatment process is realized, and the stability and controllability of the alkaline waste liquid treatment are improved;
3) in the treatment system, the quantity of the reaction tanks, the buffer tank, the feeding pump, the discharging pump II and the like is limited, so that the continuous operation of the alkaline waste liquid treatment process is realized, the treatment capacity is increased, the treatment efficiency is improved, and the stability of the treatment process is ensured;
4) when the workshop waste liquid treatment process is operated, a large amount of CS can be generated2、H2S and other toxic gases seriously increase the safety of the field environment and belong to potential hazard sources, so that the harmful gases are subjected to controllable treatment by arranging a waste gas recovery device, the safety risk of production and operation is reduced, and the automation degree is improved;
5) in the treatment process, the feeding flow rate of the alkaline waste liquid is 10-20L/s, and the feeding flow rate of the acidic waste water is 10-20L/s, so that the neutralization reaction quality of the alkaline waste liquid and the alkaline waste liquid is improved, the neutralization reaction is promoted to be complete, and the treatment process is further suitable for the subsequent filter pressing process of a filter press and the post-treatment process of a filter cake of a filtrate. The reaction liquid is fed at a flow rate of 20m3H is conveyed to a buffer tank, and the reaction liquid in the buffer tank has the feed flow rate of 32m3The feed flow is limited to ensure the stability of the treatment process;
6) in the treatment process, the rotating speed of the stirring mechanism is 10r/min, the pressure in the reaction tank is controlled to be less than 0Mbar, the temperature is less than or equal to 60 ℃, the acid-base neutralization reaction is ensured to be complete, suspended matters such as cellulose and the like are not scattered, and meanwhile, the reaction liquid with the pH of 3.5-5.5 is used for ensuring the acidic water environment, namely the hydrogen bonds of the cellulose, the hemicellulose and the like determine the generation and the size of the suspended matters.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
in the figure, 1, a collecting tank, 2, a reaction tank, 3, a buffer tank, 4, a filter press, 5, a conveying pipe I, 51, a feeding pump, 52, an alkali liquor automatic valve, 6, a conveying pipe II, 61, a material pouring pump I, 62, a material pouring automatic valve, 7, a conveying pipe III, 71, a material pouring pump II, 8, an acid wastewater tank, 9, an acid conveying pipe, 91, an acid liquor automatic valve, 10, a circulating pipe, 11, a circulating automatic valve, 12, an exhaust pipe, 13, a recycling automatic valve, 14, a liquid level transmitter I, 15, a motor, 16, a stirring mechanism, 17, a pH detector, 18, a liquid level transmitter II, 19, a liquid level transmitter III, 20, an exhaust gas recycling device, 21, a pressure detector, 22 and a fan.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
As shown in fig. 1: a system for treating alkaline waste liquid in viscose fiber production comprises a collecting tank 1 for collecting and storing alkaline waste liquid, a reaction tank 2 for carrying out neutralization reaction, a buffer tank 3 for buffering flow and a filter press 4 for carrying out solid-liquid separation on solution, wherein a discharge port of the collecting tank 1 is connected with a feed port of the reaction tank 2 through a conveying pipe I5, a discharge port of the reaction tank 2 is connected with a feed port of the buffer tank 3 through a conveying pipe II 6, a feed port of the buffer tank 3 is connected with a feed port of the filter press 4 through a conveying pipe III 7, a feed pump 51 and an automatic alkali liquid adding valve 52 are arranged on the conveying pipe I5, a material pouring pump I61 and an automatic material pouring valve 62 are arranged on the conveying pipe II 6, and a material pouring pump II;
an acid waste water tank 8 for collecting and storing acid waste water generated by spinning, plasticizing, stretching and the like is arranged in viscose fiber production, the reaction tank 2 is connected with the acid waste water tank 8 through an acid conveying pipe 9, and an acid adding liquid automatic valve 91 is arranged on the acid conveying pipe 9;
a circulating pipe 10 is communicated with the conveying pipe II 6, one end of the circulating pipe 10 is connected with the conveying pipe II 6, the other end of the circulating pipe 10 is connected with a circulating port of the reaction tank 2, and a circulating automatic valve 11 is arranged on the circulating pipe 10;
the reaction tank 2 and the buffer tank 3 are both connected with a waste gas recovery device 20 through an exhaust pipe 12, and the exhaust pipe 12 is provided with a recovery automatic valve 13;
the filter press 4 is a membrane filter press of the prior art.
According to under the operating mode environment of reality, blast pipe 12 still is equipped with pressure measurement appearance 21 and fan 22, when waiting that pressure measurement appearance 21 detected pressure to be greater than or equal to 0Mbar, can also normal operating for guaranteeing processing system in the unable circumstances of retrieving of waste gas, so adjust through retrieving automatic valve 13, directly discharge the atmosphere with waste gas, otherwise, gaseous accumulation in a large number can take place jar body explosion, and then influence the security of production line.
Example 2
Based on example 1, further,
and a liquid level transmitter I14 is arranged on the collecting tank 1 and used for monitoring the liquid level change in the collecting tank 1.
The number of the feed pumps 51 is two, and the feed pumps 51 are connected in parallel with each other.
Example 3
Based on example 2, it is further preferred that,
a stirring mechanism 16 driven by a motor 15 is arranged in the reaction tank 2, and a pH detector 17 and a liquid level transmitter II 18 are arranged on the reaction tank 2.
The number of the reaction tanks 2 is two, and the reaction tanks 2 are connected with the reaction tanks 2 in parallel.
Example 4
Based on example 3, it is further preferred that,
the number of the buffer tanks 3 is two, and the buffer tanks 3 are connected with the buffer tanks 3 in a parallel connection mode. The buffer tank 3 increases the reaction buffer amount, and the buffer reaction takes time; and a liquid level transmitter III 19 is arranged on the buffer tank 3.
The two material pouring pumps II 71 are connected in parallel.
Example 5
A process for treating alkaline waste liquid in viscose fiber production specifically comprises the following steps:
1) collecting alkaline waste liquid generated in the production of viscose fibers, and temporarily storing the alkaline waste liquid in a collecting tank 1;
2) conveying the alkaline waste liquid in the collecting tank 1 to the reaction tank 2 at a feeding flow rate of 10L/s, and simultaneously conveying the acidic waste water in the acidic waste water tank 8 to the reaction tank 2 at a feeding flow rate of 10L/s; in the reaction tank 2, the alkaline waste liquid and the acidic waste water are subjected to neutralization reaction to obtain a reaction liquid with the pH value of 5.5;
3) feeding the reaction solution obtained in the step 2) at a feed flow rate of 20m3H, conveying to a buffer tank 3, buffering and temporarily storing;
4) the reaction solution in the buffer tank 3 was fed at a flow rate of 32m3And/h, conveying the mixture to a filter press 4, performing filter pressing through the filter press 4 to obtain a filter cake and filtrate with the pH value of 5.5, and respectively recovering and treating the filtrate.
The alkaline waste liquid is alkaline waste liquid containing substances such as cellulose sulfonate, sodium hydroxide, carbon disulfide, alpha-cellulose, hemicellulose, sodium carbonate, sodium trithiocarbonate, sodium dithiocarbonate, sodium thiosulfate and the like, wherein COD is 15000mg/L, SS is 8000mg/L, and the concentration of the sodium hydroxide is 15 g/L.
The filtrate comprises Na2SO4And Zn2SO4The filter residue comprises hemicellulose and cellulose.
Example 6
Based on example 5, this example differs in that:
in the step 1), the alkaline waste liquid in the collecting tank 1 is conveyed to the reaction tank 2 at a feeding flow rate of 20L/s, and the acidic waste water in the acidic waste water tank 8 is conveyed to the reaction tank 2 at a feeding flow rate of 20L/s; the reaction solution was obtained at pH 3.5.
In step 4), the filtrate had a pH of 3.5.
Example 7
Based on examples 5-6, this example differs in that:
in the step 1), the alkaline waste liquid in the collecting tank 1 is conveyed to the reaction tank 2 at a feeding flow rate of 15L/s, and the acidic waste water in the acidic waste water tank 8 is conveyed to the reaction tank 2 at a feeding flow rate of 15L/s; the reaction solution was obtained at pH 4.5.
In step 4), the filtrate had a pH of 4.5.
Example 8
Based on examples 5-7, further,
in the reaction tank 2, the rotating speed of the stirring mechanism 16 is 10 r/min; and the pressure in the reaction tank 2 is controlled to be less than 0Mbar, and the temperature is controlled to be less than or equal to 60 ℃.
In the filter press 4, the inlet pressure is 3-8bar and the temperature is < 60 ℃.
Example 9
The technical scheme is further explained by taking the alkaline waste liquid in the actual production line treatment process as an example.
Such as: in viscose production, the average yield of discharged water is 600m3D (COD: 15000mg/L, SS: 8000 mg/L), which is mixed with 400 m3After the acid wastewater reacts, the treatment of the alkaline waste liquid and the acid wastewater is realized, the environmental protection pressure is relieved, and meanwhile, waste can be changed into valuable.
For another example: producing 14 tons of viscose fiber, 1 ton of alkaline waste liquid and 0.6 ton of acid waste water, wherein the concentration of sodium hydroxide in the alkaline waste liquid is 15-20g/L, and the concentration of sulfuric acid in the acid waste water is 4-8 g/L. If the traditional acidic and alkaline high-COD wastewater treatment method is adopted, the microorganism fermentation method has great treatment difficulty, and the COD of the discharged water is easy to exceed the standard.
And alkaline waste liquid and acid waste water carry out the preceding reaction of mutual acid-base neutralization, can realize handling most COD, and the environmental protection carries out the fine processing, will greatly reduce the environmental protection COD that leaves the station.
Example 10
Based on example 5, the alkaline waste liquid feed flow rate was set to 5m3H, feed flow rate 13L/s; the rotation speed in the reaction tank 2 is set to be 10r/min, the pressure is-8 mbar, the temperature is 54 ℃, the pressure in the filter press 4 is set to be 5.5bar, the temperature is 45 ℃, alkaline waste liquid treatment is carried out, and the pH change of the reaction tank 2 is shown in the following table 1.
Claims (10)
1. The utility model provides an alkaline waste liquid processing system in viscose fiber production which characterized in that: the device comprises a collecting tank (1) for collecting and storing alkaline waste liquid, a reaction tank (2) for carrying out neutralization reaction, a buffer tank (3) for buffering flow and a filter press (4) for carrying out solid-liquid separation on solution, wherein a discharge hole of the collecting tank (1) is connected with a feed inlet of the reaction tank (2) through a conveying pipe I (5), a discharge hole of the reaction tank (2) is connected with a feed inlet of the buffer tank (3) through a conveying pipe II (6), a feed inlet of the buffer tank (3) is connected with a feed inlet of the filter press (4) through a conveying pipe III (7), a feed pump (51) and an automatic valve (52) for adding alkaline liquid are arranged on the conveying pipe I (5), a material pouring pump I (61) and an automatic material pouring valve (62) are arranged on the conveying pipe II (6), and a material pouring pump II (71;
an acid wastewater tank (8) for collecting and storing acid wastewater is arranged in the viscose production, the reaction tank (2) is connected with the acid wastewater tank (8) through an acid conveying pipe (9), and an acid liquid adding automatic valve (91) is arranged on the acid conveying pipe (9);
a circulating pipe (10) is communicated with the conveying pipe II (6), one end of the circulating pipe (10) is connected with the conveying pipe II (6), the other end of the circulating pipe (10) is connected with a circulating port of the reaction tank (2), and a circulating automatic valve (11) is arranged on the circulating pipe (10);
the reaction tank (2) and the buffer tank (3) are both connected with a waste gas recovery device (20) through an exhaust pipe (12), and the exhaust pipe (12) is provided with a recovery automatic valve (13).
2. The system for treating the alkaline waste liquid in the production of the viscose fibers according to claim 1, wherein: be equipped with liquid level transmitter I (14) on collection tank (1), be equipped with pH detector (17) and liquid level transmitter II (18) on retort (2), be equipped with liquid level transmitter III (19) on buffer tank (3).
3. The system for treating the alkaline waste liquid in the viscose fiber production according to claim 1 or 2, wherein: the feeding pumps (51) are at least two, and the feeding pumps (51) are connected with the feeding pumps (51) in a parallel mode.
4. The system for treating the alkaline waste liquid in the production of the viscose fibers according to claim 1, wherein: a stirring mechanism (16) driven by a motor (15) is arranged in the reaction tank (2).
5. The system for treating the alkaline waste liquid in the production of the viscose fibers according to claim 1 or 4, wherein: the reaction tanks (2) are at least two, and the reaction tanks (2) are connected with the reaction tanks (2) in a parallel mode.
6. The system for treating the alkaline waste liquid in the production of the viscose fibers according to claim 1, wherein: the buffer tanks (3) are at least two, and the buffer tanks (3) are connected with the buffer tanks (3) in a parallel mode.
7. The system for treating the alkaline waste liquid in the production of the viscose fibers according to claim 1 or 6, wherein: the material pouring pumps II (71) are at least two, and the material pouring pumps II (71) are connected in parallel.
8. The process for treating the alkaline waste liquid in the viscose fiber production according to claim 1, which is characterized by comprising the following steps:
1) collecting alkaline waste liquid generated in viscose fiber production, and temporarily storing the alkaline waste liquid in a collecting tank (1);
2) conveying the alkaline waste liquid in the collecting tank (1) to the reaction tank (2) at a feeding flow rate of 10-20L/s, and simultaneously conveying the acidic waste water in the acidic waste water tank (8) to the reaction tank (2) at a feeding flow rate of 10-20L/s; in the reaction tank (2), the alkaline waste liquid and the acidic waste water are subjected to neutralization reaction to obtain reaction liquid with pH of 3.5-5.5;
3) feeding the reaction solution obtained in the step 2) at a feed flow rate of 20m3H, conveying the mixture to a buffer tank (3), buffering and temporarily storing;
4) the reaction liquid in the buffer tank (3) is fed at a flow rate of 32m3And/h, conveying the mixture to a filter press (4), carrying out filter pressing through the filter press (4) to obtain a filter cake and filtrate with the pH value of 3.5-5.5, and respectively recycling and treating the filtrate.
9. The process for treating the alkaline waste liquid in the viscose fiber production according to claim 8, wherein in the reaction tank (2), the rotating speed of the stirring mechanism (16) is 10 r/min; and the pressure in the reaction tank (2) is controlled to be less than 0Mbar, and the temperature is controlled to be less than or equal to 60 ℃.
10. The process for the treatment of alkaline waste liquor from the production of viscose according to claim 8 or 9, characterised in that in the filter press (4) the inlet pressure is 3-8bar and the temperature is < 60 ℃.
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| CN211770681U (en) * | 2019-12-26 | 2020-10-27 | 宜宾丝丽雅股份有限公司 | Alkaline waste liquid treatment system in viscose fiber production |
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| CN202912714U (en) * | 2012-10-29 | 2013-05-01 | 江苏威司顿印刷科技有限公司 | Aluminum hydroxide preparation system by using production wastewater of precoating sensitized plates |
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