CN108751328B - Deodorization method for acidic water in viscose fiber industry - Google Patents
Deodorization method for acidic water in viscose fiber industry Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 60
- 229920000297 Rayon Polymers 0.000 title claims abstract description 42
- 239000000835 fiber Substances 0.000 title claims description 11
- 238000004332 deodorization Methods 0.000 title abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 196
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 75
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000001179 sorption measurement Methods 0.000 claims abstract description 39
- 238000011282 treatment Methods 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 24
- 239000002253 acid Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 18
- 238000004458 analytical method Methods 0.000 claims description 15
- 230000001877 deodorizing effect Effects 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims 1
- 239000003002 pH adjusting agent Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 8
- 239000002351 wastewater Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000009965 odorless effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 22
- 238000001514 detection method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 238000011160 research Methods 0.000 description 8
- 235000013601 eggs Nutrition 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 238000009776 industrial production Methods 0.000 description 6
- 230000009967 tasteless effect Effects 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000002336 sorption--desorption measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000035943 smell Effects 0.000 description 2
- 101710178035 Chorismate synthase 2 Proteins 0.000 description 1
- 101710152694 Cysteine synthase 2 Proteins 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- -1 hydrogen peroxide ions Chemical class 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a deodorization method of acidic water in viscose industry, which aims to perform odor treatment and recycle on the acidic water directly discharged outside. The method mainly comprises the following steps: use of activated carbon for treating H in acidic water2S、CS2Adsorbing impurities to obtain transparent odorless recyclable acidic water; and (4) the active carbon is analyzed by hydrogen peroxide under an alkaline condition, and the adsorption process is continuously repeated on the analyzed active carbon. The invention not only can purify the air of a workshop, but also reduces the emission of partial waste water, saves water resources and improves the economic benefit of enterprises.
Description
Technical Field
The invention relates to a method for deodorizing acidic water in the viscose industry, belonging to the field of acidic wastewater treatment in the viscose field.
Background
In the face of the current situation of continuous water resource exhaustion, the water treatment scheme which is more effective is deeply reformed on the basis of the traditional sewage treatment process is improved worldwide, wherein the industrial wastewater is the main cause of water pollution, has the problems of complex components, variable properties and the like, and the treatment of the industrial wastewater is the important factor for saving water resources. The production process of the viscose industry consumes more water and gas, so that the energy conservation and the consumption reduction to the maximum extent become the main tasks of the viscose industry. The water quality index of the sewage discharged after primary treatment reaches the comprehensive sewage discharge standard GB8978-1996 three-level standard: the sulfide content of the discharged sewage is controlled below 1.0mg/L, the COD content is controlled below 500mg/L, and the zinc ion content is controlled below 5.0 mg/L. The directly discharged acidic water in the viscose industry has large water content and mainly contains H2S、CS2Isosulfides of p-H2S、CS2The acidic water can be recycled by treating and removing peculiar smell, so that energy conservation and emission reduction are realized, and the enterprise can keep competitiveness.
H in the present wastewater2The S removal method mainly comprises an aeration treatment method, a complex iron method, an ozone oxidation method, a biochemical method and the like, but the methods have respective problems, either complex process or secondary pollution, and the general cost is higher.
Disclosure of Invention
The invention is toSolves the technical problem of providing a method for deodorizing acidic water in the viscose industry, which can remove ultra-low concentration sulfide (H) by utilizing the characteristics of large specific surface area and strong adsorption capacity of activated carbon2S、CS2Etc.) and has simple process, no secondary pollution and low cost, and is particularly suitable for large-scale industrial production.
The technical scheme for solving the technical problems is as follows: a method for deodorizing acidic water in the viscose industry comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S and CS2；
(2) Active carbon is used as an adsorption medium, the active carbon is filled in a filtering device, and acidic water is introduced into the filtering device for adsorption treatment;
(3) discharging the liquid after adsorption treatment, and periodically sampling in the ambient environment at the water outlet to perform gas content determination;
(4) and (3) if the measured contents of H2S and CS2 are always less than or equal to the set values until the quantitative acidic water is treated, taking the activated carbon out of the filtering device, analyzing the activated carbon by using hydrogen peroxide, reusing the analyzed activated carbon for the adsorption treatment in the step (2), repeating the adsorption-analysis process, and if the measured contents of H2S and CS2 are greater than the set values, selecting new activated carbon and restarting the step (2).
The invention has the beneficial effects that: by carrying out deodorization research on the acidic water in the viscose industry, the activated carbon can be used for adsorbing H in the acidic water in the viscose industry2S，CS2Reducing turbidity to reach the aim of deodorization, and performing hydrogen peroxide solution regeneration on the active carbon to ensure that the active carbon can be recycled until the service life of the active carbon is reached. By adopting the treatment method, the acidic water which is directly discharged outwards originally can be recycled for reuse, so that the air in a workshop is purified, energy conservation and emission reduction are realized, the process is simple, and the method is very suitable for industrial production.
The invention aims at the deodorization research of acidic water in the viscose industry, and mainly comprises the following steps: by using activated carbon to make acidH in water2S、CS2Adsorbing impurities to obtain transparent odorless recyclable acidic water; and (4) the active carbon is analyzed by hydrogen peroxide under the alkaline condition, and the adsorption-analysis process is continuously repeated on the analyzed active carbon.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in the step (1), H in the acid water in the viscose industry2S content of 60-100ppm, CS2The content is 30-50 ppm. Before treatment, the acid water in the viscose industry is light yellow and smells like eggs, which is caused by that the acid water contains a certain amount of H2S and CS 2.
The further scheme has the beneficial effects that the active carbon used by the invention has strong adsorption capacity, and not only can adsorb H in acidic water2S、CS2The adsorption is carried out, the turbidity and the chromaticity of the water quality are effectively treated, no pollutant is produced by physical adsorption, and the process is safe and environment-friendly.
Further, the acidic water in the viscose fiber industry is introduced into the filtering device in a mode of entering from bottom to top, and the flow rate is 200-400 mL/min.
Further, in the step (2), the amount of the activated carbon is 700-900g corresponding to the flow rate of the acid water in the viscose industry.
The beneficial effects of adopting above-mentioned further scheme are that the active carbon is the porous structure material, and specific surface is big, and adsorption efficiency is strong, can get rid of ultralow concentration sulphide and simple process, and no secondary pollution, and advance down with certain velocity of flow and make acid water can fully contact with the active carbon, compare with the mode of setting of advancing down or transversely passing through from top to bottom, adsorption efficiency can improve 25%.
Further, in the step (3), sampling is carried out in the ambient environment at the water discharge port every 1h for gas content testing.
Further, in the step (3), the gas content measuring method is a detecting tube measuring method, the set value is 0, and H is measured2S and CS2When the content of (A) is always equal to 0, the acidic water and water subjected to the pretreatment for analysisThe mass ratio of the charcoal is 550: 1. When measured for H2S and CS2When the content of (B) is equal to 0, the acidic water is colorless and odorless.
The inspection tube method is a gas detection method commonly used in the textile industry (specifically, the national standard GB/T33610.2-2017-textile-determination of deodorization performance-part 2: inspection tube method). The gas content is judged by means of standard color gradation according to the amount of the entered sample and the color change depth of the reagent or the length of the color change part, when in use, two ends of the gas detection tube are sawn, and the front end and the rear end of the detected reagent are filled with silica gel or alumina gel.
The invention aims to remove the odor of the acid water and make the acid water H2S、CS2The concentration of (B) is controlled to be not more than the olfactory threshold of human, and the lower limit is extremely low, so that H is measured by the measuring method of the present invention2S、CS2When the concentration is 0 (the gas content measured by the detecting tube used in the invention is in ppm level, if the gas content after treatment is lower than the ppm level, the gas content can not be measured by the detecting tube, and is shown as 0 on the scale), the adsorption of the activated carbon is considered to be complete, and the treated acidic water reaches the recycling or discharging standard.
The gas concentration in the detected environment is expressed by the color change of the detection agent in the detection tube through the reaction of the detection agent and the detected gas, and the detection mode has the characteristics of simple operation, wide application range, accurate detection, strong real-time performance and low cost. Meanwhile, the gas content test is carried out every 1h by considering the detection cost and the change curve of the adsorption capacity of the activated carbon, the adsorption capacity of the activated carbon is not changed greatly within 1h when the adsorption capacity of the activated carbon is kept at a high level, and the interval time also meets the requirement of industrial production. The optimal mass ratio of the acidic water to the activated carbon in a single circulation is controlled to be 550:1, which is measured by considering the cost, combining the benefits brought by the recycling of the treated wastewater and the consumed activated carbon and hydrogen peroxide in the treatment process.
Further, in the step (4), a hydrogen peroxide solution with the mass fraction of 32% is adopted as the hydrogen peroxide solution for analysis, and the specific gravity is 1.11 g/L.
Further, in the step (4), the temperature for analysis is 40-60 ℃, the analysis is completed when the activated carbon does not bubble in the analysis solution, the activated carbon is taken out and dried and then is used for the adsorption treatment in the step (2), and the PH is controlled between 8-11 during the analysis.
Further, the reagent for adjusting pH at the time of analysis was a 30% NaOH solution, and its specific gravity was 1.32 g/L.
Further, in the step (4), H in the hydrogen peroxide solution is analyzed2O2The mass ratio of the active carbon to the active carbon is controlled to be 1:8-1: 10.
The further scheme has the advantages that the active carbon with saturated adsorption is analyzed by hydrogen peroxide, the hydrogen peroxide is a strong oxidant under acidic and alkaline conditions, but the reaction speed of the hydrogen peroxide is very low under the acidic condition, and the reaction speed is greatly improved under the alkaline condition because the hydrogen peroxide is ionized into H in aqueous solution+And HO2 -(peroxyhydrogen ion) which is a reversible process, OH under basic conditions-Can be reacted with H+And (3) reacting to ensure that hydrogen peroxide is continuously ionized to generate a large amount of hydrogen peroxide ions to participate in the reaction process of oxidizing the sulfide (the hydrogen peroxide oxidizes the sulfide into elemental sulfur under neutral and slightly acidic conditions, sulfate radicals are generated under alkaline conditions, the active carbon is taken out and dried after being analyzed, and the residual liquid is adjusted to be neutral and then discharged into a sewage well). In addition, the hydrogen peroxide has stable property, can be stored for a long time, has economic price and is suitable for industrial production.
In the field, the acidic water is directly discharged outside, which causes serious pollution and waste, and the existing treatment methods are basically direct oxidation or complexation, have high treatment cost and cause various problems. In the invention, adsorption of activated carbon is firstly utilized, then hydrogen peroxide is utilized to analyze the activated carbon, the treatment cost is low, the process is simple, and the requirements of industrial production are met.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The invention particularly relates to a method for deodorizing acidic water in the viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) active carbon is used as an adsorption medium, the active carbon is filled in a filtering device, and acidic water is introduced into the filtering device for adsorption treatment; the filtering device can be selected to be a cylindrical structure with the diameter of 50mm and the length of 1m, is vertically arranged, is filled with 700-900g of activated carbon, and acidic water enters from the lower part to the upper part of the filtering device at the flow rate of 200-400mL/min to continuously treat H in the acidic water2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, and periodically sampling in the ambient environment at the water outlet to perform gas content determination; specifically, the gas content can be measured by sampling every 1h, and the measurement method is a detection tube measurement method;
(4) if measured H2S and CS2Until the quantitative acid water is completely treated, taking the activated carbon out of the filtering device, analyzing the activated carbon by using hydrogen peroxide, and reusing the analyzed activated carbon in the step(2) Repeating the adsorption-desorption process; h determined if the quantitative acidic water is completely treated2S and CS2If the content of (2) is greater than the set value, the active carbon in use is considered to lose activity and should be abandoned, and new active carbon is selected and the step (2) is carried out again;
the set value can be set to 0 according to the requirements of national standard on the wastewater; according to measurement and calculation, when the mass ratio of the acidic water to the activated carbon is 550:1, the cost and the effect are considered, and the method has better practicability;
the concrete steps of the analysis are as follows: taking 32% hydrogen peroxide solution (specific gravity of 1.11g/L), adjusting pH value of the solution to 8-11 with 30% NaOH solution (specific gravity of 1.32g/L), placing the taken activated carbon in the solution, and adding H in the solution2O2Controlling the mass ratio of the active carbon to be 1:8-1:10, controlling the temperature to be 40-60 ℃, resolving until the active carbon does not bubble in resolving liquid, then resolving, taking out the active carbon, drying, and then using the active carbon for the adsorption treatment in the step (2).
The technical effects of the technical solution of the present invention are analyzed by specific examples below.
Example 1
The invention relates to a research on deodorization of acidic water in viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) 700g of activated carbon is filled in a filter device with the diameter of 50mm and the length of 1m, the acidic water flows in and out from the bottom at the flow rate of 200mL/min, and H in the acidic water is continuously filtered2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, sampling in the ambient environment at the water outlet every 1h, and measuring the gas content by a detection tube measuring method;
(4) if measured H2S and CS2Is always equal to 0 until the mass isCompletely treating 900 times of acidic water with activated carbon, taking out the activated carbon from a filtering device, analyzing the activated carbon by using 32% hydrogen peroxide in mass fraction under the alkaline condition that the pH value is 8 (specifically, adjusting the pH value by using 30% NaOH solution in mass fraction), and analyzing the H in the solution2O2Controlling the mass ratio of the active carbon to be 1:8, controlling the resolution temperature to be 40 ℃, completing the resolution until the active carbon does not bubble in the resolution solution, taking out the active carbon, drying the active carbon, then using the active carbon for the adsorption treatment in the step (2), and repeating the adsorption-resolution process; if measured H2S and CS2If the content of (b) is greater than the set value, it is considered that the active carbon being used has lost its activity and should be discarded, and a new active carbon is selected and the step (2) is performed again.
Example 2
The invention relates to a research on deodorization of acidic water in viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) filling 800g of activated carbon into a filter device with the diameter of 50mm and the length of 1m, enabling the acidic water to flow in and out from the bottom at the flow rate of 300ml/min, and continuously treating H in the acidic water2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, sampling in the ambient environment at the water outlet every 1h, and measuring the gas content by a detection tube measuring method;
(4) if measured H2S and CS2Until the acid water with the mass being 800 times of that of the active carbon is completely treated, taking the active carbon out of a filtering device, analyzing the active carbon by using 32 mass percent of hydrogen peroxide under the alkaline condition that the PH value is 9 (specifically, adjusting the PH value by using 30 mass percent of NaOH solution), and analyzing the H in the solution2O2Controlling the mass ratio of the active carbon to the active carbon at 1:9, controlling the resolution temperature at 50 ℃, completing the resolution until the active carbon does not bubble in the resolution solution, taking out the active carbon, drying, and reusing the active carbon in the step (2)Adsorption treatment, repeating the adsorption-desorption process; if measured H2S and CS2If the content of (b) is greater than the set value, it is considered that the active carbon being used has lost its activity and should be discarded, and a new active carbon is selected and the step (2) is performed again.
Example 3
The invention relates to a research on deodorization of acidic water in viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) 700g of activated carbon is filled in a filter device with the diameter of 50mm and the length of 1m, the acidic water flows in and out from the bottom at the flow rate of 400ml/min, and H in the acidic water is continuously filtered2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, sampling in the ambient environment at the water outlet every 1h, and measuring the gas content by a detection tube measuring method;
(4) if measured H2S and CS2Until the acid water with the mass 550 times that of the activated carbon is completely treated, taking the activated carbon out of a filtering device, analyzing the activated carbon by using 32 mass percent of hydrogen peroxide under the alkaline condition of the pH value of 10 (specifically, adjusting the pH value by using 30 mass percent of NaOH solution), and analyzing the H in the solution2O2Controlling the mass ratio of the active carbon to be 1:10, controlling the resolution temperature to be 60 ℃, completing the resolution until the active carbon does not bubble in the resolution solution, taking out the active carbon, drying the active carbon, then using the active carbon for the adsorption treatment in the step (2), and repeating the adsorption-resolution process; if measured H2S and CS2If the content of (b) is greater than the set value, it is considered that the active carbon being used has lost its activity and should be discarded, and a new active carbon is selected and the step (2) is performed again.
Example 4
The invention relates to a research on deodorization of acidic water in viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) filling 800g of activated carbon into a filter device with the diameter of 50mm and the length of 1m, wherein the acidic water continuously flows in and out from the bottom at the flow rate of 350ml/min, and continuously reacts with H in the acidic water2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, sampling in the ambient environment at the water outlet every 1h, and measuring the gas content by a detection tube measuring method;
(4) if measured H2S and CS2Until the acid water with the mass 500 times that of the activated carbon is completely treated, taking the activated carbon out of the filtering device, analyzing the activated carbon by using 32 mass percent of hydrogen peroxide under the alkaline condition of the PH value of 11 (specifically, adjusting the PH value by using 30 mass percent of NaOH solution), and analyzing the H in the solution2O2Controlling the mass ratio of the active carbon to be 1:8, controlling the resolution temperature to be 45 ℃, completing the resolution until the active carbon does not bubble in the resolution solution, taking out the active carbon, drying the active carbon, then using the active carbon for the adsorption treatment in the step (2), and repeating the adsorption-resolution process; if measured H2S and CS2If the content of (b) is greater than the set value, it is considered that the active carbon being used has lost its activity and should be discarded, and a new active carbon is selected and the step (2) is performed again.
Example 5
The invention relates to a research on deodorization of acidic water in viscose industry, which comprises the following steps:
(1) collecting acidic water containing H in viscose industry2S (60-100ppm) and CS2(30-50ppm) is light yellow and smelly egg;
(2) filling 900g of active carbon into a filter device with the diameter of 50mm and the length of 1m, wherein the acidic water continuously flows in and out from the bottom at the flow rate of 250ml/min, and continuously reacts with H in the acidic water2S、CS2And impurities and the like are continuously adsorbed to obtain clear, transparent, colorless and tasteless acidic water;
(3) discharging the liquid after adsorption treatment, sampling in the ambient environment at the water outlet every 1h, and measuring the gas content by a detection tube measuring method;
(4) if measured H2S and CS2Until the acid water with the mass 200 times of that of the active carbon is completely treated, taking the active carbon out of a filtering device, analyzing the active carbon by using 32 mass percent of hydrogen peroxide under the alkaline condition of the PH value of 9 (specifically, adjusting the PH value by using 30 mass percent of NaOH solution), and analyzing the H in the solution2O2Controlling the mass ratio of the active carbon to be 1:10, controlling the resolution temperature to be 55 ℃, completing the resolution until the active carbon does not bubble in the resolution solution, taking out the active carbon, drying the active carbon, then using the active carbon for the adsorption treatment in the step (2), and repeating the adsorption-resolution process; if measured H2S and CS2If the content of (b) is greater than the set value, it is considered that the active carbon being used has lost its activity and should be discarded, and a new active carbon is selected and the step (2) is performed again.
And (4) comparing and analyzing results:
the turbidity of the acidic water purified by the process of the present invention (examples 1 to 5) was controlled to be less than 0.872NTU, and the transverse and longitudinal comparisons based on the test data corresponding to different mass ratios of the acidic water and the activated carbon introduced per hour and the number of adsorption-desorption cycles of the activated carbon were performed as shown in the following table.
In the table above, the ratio refers to the mass ratio of the acid water and the activated carbon quantitatively introduced during single activated carbon adsorption, the amount of the activated carbon is between 700 and 900g, and the mass ratio is calculated by converting the specific gravity of the acid water to 1 g/ml. The content refers to the gas content detected at the drain, and the number refers to the number of adsorption-desorption cycles.
The invention respectively comprises the following components in percentage by mass: four groups of experiments of 900:1, 800:1, 550:1 and 200:1 are carried out, transverse comparison is carried out, and experimental data show that mass ratio is reduced along with mass ratioSmall, measured H2S、CS2The content is gradually reduced, longitudinal comparison is carried out, and experimental data show that the circulation frequency of the activated carbon is gradually increased along with the reduction of the mass ratio.
The cycle times and costs of the activated carbons of examples 1-5 were analyzed:
1. number of cycles of activated carbon
The invention aims to remove the odor of the acid water and make the acid water H2S、CS2The concentration of (B) is controlled to be not more than the olfactory threshold of human, and the lower limit is extremely low, so that H is measured by the measuring method of the present invention2S、CS2When the concentration is 0, the acidic water is considered to reach the recycling or discharging standard, and the adsorption performance of the activated carbon is still ensured from the fifth time of the circulation of the activated carbon according to the table, but the circulation frequency of the activated carbon is comprehensively considered by combining the cost.
2. Cost of
The cost of each ton of produced water is 4.36 yuan, the cost of each ton of activated carbon is 2300 yuan, the cost of each ton of hydrogen peroxide is 1200 yuan, the molar ratio of hydrogen peroxide to activated carbon is controlled to be 1:8-1:10, the cost of the produced water is lower when the mass ratio of the acidic water to the activated carbon is more than 550:1, and the activated carbon is recycled for 3 times when the mass ratio of the acidic water to the activated carbon is 550:1, so that the optimal mass ratio of the acidic water to the activated carbon is 550:1, the production cost is saved, and the method can be used for large-scale industrial production.
The invention adopts the active carbon to carry out deodorization research on acid station acid water in the viscose industry and remove H in the acid water2S and CS2The efficiency is high, and the index of the treated acidic water meets the recycling standard. The active carbon is resolved by hydrogen peroxide, so that the effect of recycling the active carbon for 3 times is achieved. The cost of the active carbon and a small amount of hydrogen peroxide far compensates the operation cost of directly adopting production water for production, greatly saves the production cost, improves the economic benefit of enterprises, reduces the discharge amount of wastewater for the deodorization and reuse of acidic water, reduces the pollution of industrial wastewater to water and solves the problem of environmental protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for deodorizing acidic water in the viscose industry is characterized by comprising the following steps:
(1) collecting acidic water containing H in viscose industry2S and CS2；
(2) Active carbon is used as an adsorption medium, the active carbon is filled in a filtering device, and acidic water is introduced into the filtering device for adsorption treatment;
(3) discharging the liquid after adsorption treatment, and periodically sampling in the ambient environment at the water outlet to perform gas content determination;
(4) if measured H2S and CS2Until the quantitative acid water is treated, taking the activated carbon out of the filtering device, analyzing the activated carbon by using hydrogen peroxide, reusing the analyzed activated carbon for the adsorption treatment in the step (2), and repeating the adsorption-analysis process; if measured H2S and CS2If the content of (2) is greater than the set value, selecting new active carbon and repeating the step (2); the temperature of the analysis is 40-60 ℃, the analysis is completed until the activated carbon does not bubble in the analysis solution, the activated carbon is taken out and dried and then is used for the adsorption treatment in the step (2), and the pH value is controlled between 8-11 during the analysis.
2. The method for deodorizing acidic water in viscose fiber industry according to claim 1, wherein in step (1), H in the acidic water in viscose fiber industry2S content of 60-100ppm, CS2The content is 30-50 ppm.
3. The method as claimed in claim 1, wherein in the step (2), the acidic water in the viscose industry is introduced into the filtering device in a manner of downward inlet and upward outlet, and the flow rate is 200-400 mL/min.
4. The method for deodorizing acidic water in the viscose fiber industry as defined in claim 3, wherein in the step (2), the amount of the activated carbon is 700-900g corresponding to the flow rate of the acidic water in the viscose fiber industry.
5. The method for deodorizing acidic water in the viscose fiber industry according to claim 1, wherein in the step (3), the gas content test is performed by sampling the ambient environment at the water outlet every 1 h.
6. The method for deodorizing acidic water in viscose fiber industry according to claim 5, wherein in step (3), the gas content measuring method is a detecting tube measuring method, the set value is 0, and H is measured2S and CS2When the content of (b) is always 0, the mass ratio of the acidic water to the activated carbon before the analysis treatment is 550: 1.
7. The method for deodorizing acidic water in the viscose fiber industry according to any one of claims 1 to 6, wherein in the step (4), the hydrogen peroxide solution for desorption is 32% by mass, and the specific gravity of the hydrogen peroxide solution is 1.11 g/L.
8. The method as claimed in claim 7, wherein the pH adjusting agent is 30% NaOH solution with specific gravity of 1.32 g/L.
9. The method for deodorizing acidic water in viscose fiber industry according to claim 7, wherein in the step (4), H in hydrogen peroxide solution is resolved2O2The mass ratio of the active carbon to the active carbon is controlled to be 1:8-1: 10.
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