CN108373240B - A kind of cotton printing and dyeing wastewater treatment and reuse integrated process - Google Patents
A kind of cotton printing and dyeing wastewater treatment and reuse integrated process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000004043 dyeing Methods 0.000 title claims abstract description 53
- 238000007639 printing Methods 0.000 title claims abstract description 40
- 229920000742 Cotton Polymers 0.000 title claims abstract description 23
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 12
- 239000002351 wastewater Substances 0.000 claims abstract description 108
- 239000000975 dye Substances 0.000 claims abstract description 8
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 8
- 231100000719 pollutant Toxicity 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000004064 recycling Methods 0.000 claims description 16
- 230000003197 catalytic effect Effects 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000005188 flotation Methods 0.000 claims description 7
- 230000007062 hydrolysis Effects 0.000 claims description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 5
- 238000004061 bleaching Methods 0.000 claims description 5
- 238000009990 desizing Methods 0.000 claims description 5
- 238000007730 finishing process Methods 0.000 claims description 5
- 230000020477 pH reduction Effects 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005262 decarbonization Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000002957 persistent organic pollutant Substances 0.000 claims description 3
- 238000009991 scouring Methods 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 2
- 239000000987 azo dye Substances 0.000 claims description 2
- 230000036782 biological activation Effects 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 231100000086 high toxicity Toxicity 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 244000005700 microbiome Species 0.000 claims description 2
- 239000008237 rinsing water Substances 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims 2
- 150000001448 anilines Chemical class 0.000 abstract 1
- 239000005416 organic matter Substances 0.000 abstract 1
- 239000004753 textile Substances 0.000 description 13
- 238000004062 sedimentation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 210000002268 wool Anatomy 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
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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
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
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- C02F2101/38—Organic compounds containing nitrogen
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2305/00—Use of specific compounds during water treatment
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- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- C02F3/02—Aerobic processes
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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Abstract
本发明公开了一种棉印染废水分质处理及回用集成化工艺，其特征在于，将棉印染废水根据污染物的浓度及特点根据浓度进行分质收集，分为高浓度废水和低浓度废水；在企业印染废水处理站建立两套废水处理工艺分别针对两种不同浓度的废水，高浓度废水采用预处理和生化组合工艺，对废水中的有机物进行有效的去除，达到企业间接排放标准；低浓度废水采用预处理、生化处理及深度处理工艺对污水中的污染物进行有效的去除，使出水达到漂洗回用标准，实现废水的资源化利用。本发明在实现企业内部棉印染废水达标排放及分质回用、难降解染料及其衍生的苯胺、助剂有效去除的同时，可有效提高废水的资源化利用率。本发明工艺简单，成本较低，易于工程化。
The invention discloses an integrated process for the treatment and reuse of cotton printing and dyeing wastewater by quality. ;Establish two sets of wastewater treatment processes in the printing and dyeing wastewater treatment station of the enterprise for two different concentrations of wastewater. The high-concentration wastewater adopts a pretreatment and biochemical combination process to effectively remove the organic matter in the wastewater and meet the indirect discharge standard of the enterprise; low Concentration wastewater adopts pretreatment, biochemical treatment and advanced treatment process to effectively remove pollutants in wastewater, so that the effluent reaches the standard of rinsing and reuse, and realizes the resource utilization of wastewater. The method can effectively improve the resource utilization rate of the wastewater while realizing the standard discharge and quality reuse of cotton printing and dyeing wastewater within the enterprise, and the effective removal of refractory dyes and their derived anilines and auxiliaries. The invention has simple process, low cost and easy engineering.
Description
Technical Field
The invention relates to a quality-based treatment and recycling integrated process for cotton printing and dyeing wastewater, belonging to the technical field of environmental protection.
Background
The textile industry is the pillar industry and the important civil industry of national economy of China, is also the industry with stronger international competitiveness, and simultaneously, the textile industry is the biggest resource and energy intensive industry of our country, and belongs to the typical high-pollution industry. The problem of the discharge of the wastewater pollutants in the textile industry is always the most sensitive problem in the treatment of environmental pollution. The total amount of wastewater discharge and pollutant discharge of the textile industry is 3-4 higher than that of the national industrial industry all the time, the textile industry is one of the industries with the largest water consumption and water discharge, and in recent years, the annual average wastewater discharge of the textile industry is about 23 hundred million tons and is only positioned behind the paper making and chemical industries. The printing and dyeing wastewater accounts for about 80% of the total amount of the discharged textile industry wastewater, and is discharged in the process of forming printing and dyeing finished products in the full-process dyeing and finishing process production processes of desizing, boiling, bleaching, dyeing and printing of raw materials of printing and dyeing products such as grey cloth formed by weaving natural fibers and synthetic fibers. The textile printing and dyeing of China is classified according to textile raw materials and mainly divided into natural fiber and synthetic fiber textile printing and dyeing. The natural fibers mainly comprise cotton, wool, silk, hemp and the like, wherein the cotton textile printing and dyeing researched by the invention has a great proportion in yield and scale. The cotton printing and dyeing wastewater comprises desizing wastewater, scouring wastewater, dyeing wastewater, bleaching wastewater and the like generated by a pretreatment process, wherein pretreatment, dyeing drainage and 1 st washing water are high-concentration wastewater, and 2-3 washing water are low-concentration wastewater.
At present, the treatment of the printing and dyeing wastewater is mainly a centralized collection and unified treatment method, wastewater discharged by different printing and dyeing processes is uniformly collected, the wastewater is uniformly treated by processes such as physical and chemical coagulation, biodegradation, advanced oxidation and the like after being mixed to reach an indirect discharge standard, and partial effluent is shunted to a deep treatment tank, so that the treated effluent reaches a reuse standard, but the problem of high investment and high operation cost commonly exists in the uniform mixed treatment of high-concentration wastewater and low-concentration wastewater. Especially, in the process of partial diversion treatment of mixed wastewater, because partial organic matters in the mixed wastewater, coloring agents and color fixing agents represented by inorganic salts such as sodium sulfate and soda ash cannot be effectively removed in the mixed treatment, the advanced treatment process is complicated, and the cost is increased.
Disclosure of Invention
The invention aims to solve the problems that: how to achieve the effect of resource utilization simultaneously aiming at the shunting and quality-dividing treatment of cotton printing and dyeing wastewater with different concentrations.
In order to solve the problems, the invention provides an integrated process for cleaning, shunting, quality-dividing treatment and quality-dividing recycling of cotton printing and dyeing wastewater, and realizes standard discharge and resource utilization of the cotton printing and dyeing wastewater. The invention adopts the following technical scheme:
the integrated process for treating and recycling the cotton printing and dyeing wastewater according to the quality is characterized by comprising the following steps of:
step 1): performing quality-based collection on the cotton printing and dyeing wastewater according to the concentration and the characteristics of pollutants, and dividing the cotton printing and dyeing wastewater into high-concentration wastewater and low-concentration wastewater;
step 2): two sets of wastewater treatment processes are established in an enterprise printing and dyeing wastewater treatment station, aiming at two kinds of wastewater with different concentrations, the pretreatment and biochemical combined process is adopted for the high-concentration wastewater, and organic matters in the wastewater are effectively removed to reach the enterprise indirect discharge standard; the low-concentration wastewater adopts pretreatment, biochemical treatment and advanced treatment processes to effectively remove pollutants in the wastewater, so that the effluent reaches the rinsing and recycling standard, and the resource utilization of the wastewater is realized.
Preferably, COD of the high-concentration wastewater in the step 1) is 2500-3000 mg/L, and the high-concentration wastewater comprises pretreatment from a dyeing and finishing process, dyeing drainage and the 1 st washing water; the COD of the low-concentration wastewater is 400-600 mg/L, and the low-concentration wastewater comprises 2-3 washing water channels.
More preferably, the dyeing and finishing process pretreatment comprises any one or more of desizing, scouring, bleaching and mercerizing.
Preferably, the treatment process of the high-concentration wastewater in the step 2) adopts at least one of shallow air flotation, biological enhancement and synchronous denitrification and decarbonization processes.
More preferably, the shallow air flotation process is a pretreatment process, air flotation effluent passes through a high load area, a medium load area and a low load area of the gradient load aerobic tank, most of high-concentration organic matters in wastewater are decomposed by microorganisms, and the COD removal efficiency is 60%; the biological strengthening process adopts a catalytic enhanced hydrolysis tank, and utilizes catalytic filler taking zero-valent iron as a matrix to activate dominant strains in the hydrolysis acidification process, so that non-degradable macromolecular organic matters in wastewater are converted into easily degradable organic matters, the azo dye can be effectively inhibited from generating high-toxicity aniline under the anaerobic condition, and the COD removal efficiency is 30%; the synchronous denitrification and carbon removal process adopts an anoxic tank and an ISND internal carbon source synchronous nitrification and denitrification tank to further remove organic matters in water and remove total nitrogen in the water, the ISND internal carbon source synchronous nitrification and denitrification tank has a synchronous nitrification and denitrification function, the removal rate of the total nitrogen is improved, the removal efficiency of the total nitrogen is 70%, and the Fe3+ generated by reaction is combined with phosphorus in the water to realize chemical phosphorus removal.
Preferably, the pretreatment process of the low-concentration wastewater in the step 2) comprises the following steps: the effluent enters an ozone advanced catalytic oxidation tank, OH with strong oxidizing capability is generated under the action of a catalyst, the biodegradability of refractory organic matters is improved, the refractory organic matters, refractory dyes and auxiliaries in the water are oxidized and decomposed into easily degradable micromolecular substances, and the removal efficiency of COD is 60%; the biochemical treatment process comprises the following steps: the biological aerated filter is adopted to further remove organic matters which are difficult to degrade in water, and the COD removal efficiency is 30 percent; the advanced treatment process comprises the following steps: and deeply removing suspended solids in the water by using a fiber rotary disc filter.
Preferably, the effluent of the advanced treatment process is used for rinsing and recycling.
The invention carries out decontamination shunting, quality-based treatment and quality-based recycling integrated treatment on cotton printing and dyeing wastewater generated by textile printing and dyeing enterprises. According to the water quality characteristics of the wastewater generated by different production processes, the high-concentration wastewater and the low-concentration wastewater are treated by different processes, and the wastewater is recycled according to different quality requirements of effluent water quality and production processes of printing and dyeing enterprises. After being pretreated and biochemically treated with high standard, the high-concentration wastewater reaches the indirect discharge standard and is discharged to a centralized wastewater treatment plant in an industrial park. In addition, the low-concentration wastewater is pretreated, subjected to high-standard biochemical treatment and advanced treatment, so that the quality of the effluent reaches the rinsing reuse standard, and the resource utilization of the wastewater is realized. The invention has the following beneficial effects:
(1) the invention adopts the mode of 'sewage disposal, diversion and quality-based treatment' to fully consider the characteristics of the textile printing and dyeing wastewater, and generally reduces the wastewater treatment difficulty, investment and operation cost;
(2) the invention integrates various advanced and efficient treatment technologies, and has obvious removal effect on the refractory dye and aniline and auxiliary agent derived from the refractory dye in the printing and dyeing wastewater besides realizing stable standard discharge;
(3) the invention can simultaneously realize multiple approaches of standard discharge, rinsing recycling and the like through different combined processes, maximally improve the recycling rate of the wastewater, provide a rationalization approach for the final destination of the wastewater and reduce the wastewater treatment cost.
Drawings
FIG. 1 is a flow chart of an integrated process for quality-based treatment and recycling of printing and dyeing wastewater.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The integrated process for treating and recycling the cotton printing and dyeing wastewater according to the quality adopted in the embodiment 1-2 comprises the following steps:
step 1): the cotton printing and dyeing wastewater is collected according to the concentration and the characteristics of pollutants, and is from pretreatment such as desizing, boiling, bleaching, mercerizing and the like of a dyeing and finishing process and dyeing drainage, the 1 st washing water is high-concentration wastewater, and the 2 nd to 3 rd washing water is low-concentration wastewater.
Step 2): high-concentration wastewater enters an adjusting tank through a grid and a lifting pump room, acid or alkali is added into the adjusting tank to adjust the pH of the wastewater to be less than or equal to 6.5 and less than or equal to 8.5, the wastewater enters a shallow air flotation tank after the water quality and the water quantity are adjusted by an adjusting tank, and a proper amount of PAM and polyferric are added to remove part of dye particles and colloidal organic pollutants. The effluent enters a hydrolysis acidification tank after passing through a gradient load aerobic tank, and the hydraulic retention time is 9 hours. The effluent enters a biochemical sedimentation tank for sedimentation for 2.5 hours after being reacted by an anoxic tank and a carbon source synchronous nitrification and denitrification tank in ISND, and the effluent can reach the indirect discharge standard of enterprises;
step 3): the low-concentration printing and dyeing wastewater reaches an adjusting tank through a grid and a lifting pump room, and acid or alkali is added into the adjusting tank to adjust the pH of the wastewater to be less than or equal to 6.5 and less than or equal to 8.5. And (3) enabling the effluent to enter a shallow air flotation tank, adding a proper amount of PAM (polyacrylamide) and polyferric oxide, and removing part of dye particles and colloidal organic pollutants. The effluent enters a gradient load aerobic tank and a catalytic enhanced hydrolysis acidification tank, so that most organic matters are degraded and the catalytic performance of the wastewater is improved. The effluent enters a biochemical sedimentation tank for sedimentation for 2.5 hours after being reacted in a catalytic enhanced anoxic tank and a synchronous nitrification and denitrification tank for carbon sources in ISND. The effluent wastewater enters an ozone advanced catalytic oxidation tank, OH with strong oxidizing capability is generated under the action of a catalyst, the biodegradability of the refractory organic matters is improved, and the refractory organic matters in the wastewater, such as aniline, refractory dyes, auxiliaries and the like, are oxidized and decomposed into easily degradable micromolecular substances. The effluent enters an advanced treatment stage after being subjected to ozone catalytic oxidation, and reaches the standard of rinsing water after being treated by an aeration biological activation filter and a fiber rotary disc filter.
Example 1
The amount of printing and dyeing wastewater in a certain enterprise is as follows: high concentration wastewater 5000m3D, low concentration waste water 4000m3The water quality of inlet and outlet water is shown in Table 1.
TABLE 1 wastewater treatment Process removal efficiency
Example 2
The amount of printing and dyeing wastewater in a certain enterprise is as follows: high concentration wastewater 5000m3D, low concentration wastewater 5000m3The water quality of inlet and outlet water is shown in Table 2.
TABLE 2 wastewater treatment process removal efficiency
Claims (4)
1. The integrated process for treating and recycling the cotton printing and dyeing wastewater according to the quality is characterized by comprising the following steps of: step 1): performing quality-based collection on the cotton printing and dyeing wastewater according to the concentration and characteristics of pollutants, and dividing the cotton printing and dyeing wastewater into high-concentration wastewater and low-concentration wastewater; step 2): two sets of wastewater treatment processes are established in an enterprise printing and dyeing wastewater treatment station, aiming at two kinds of wastewater with different concentrations, the pretreatment and biochemical combined process is adopted for the high-concentration wastewater, and organic matters in the wastewater are effectively removed to reach the enterprise indirect discharge standard; the low-concentration wastewater adopts pretreatment, biochemical treatment and advanced treatment processes to effectively remove pollutants in the wastewater, so that the effluent reaches the rinsing and recycling standard, and the resource utilization of the wastewater is realized; the treatment process of the high-concentration wastewater in the step 2) adopts shallow air flotation, biological enhancement and synchronous denitrification and decarbonization processes; the shallow air floatation process is a pretreatment process, air floatation effluent passes through a high load area, a medium load area and a low load area of a gradient load aerobic tank, most high-concentration organic matters in wastewater are decomposed by microorganisms, and the COD removal efficiency is 60%; the biological strengthening process adopts a catalytic enhanced hydrolysis tank, and utilizes catalytic filler taking zero-valent iron as a matrix to activate dominant strains in the hydrolysis acidification process, so that non-degradable macromolecular organic matters in wastewater are converted into easily degradable organic matters, the azo dye can be effectively inhibited from generating high-toxicity aniline under the anaerobic condition, and the COD removal efficiency is 30%; the synchronous denitrification and decarbonization process adopts an anoxic tank and an ISND internal carbon source synchronous nitrification and denitrification tank to further remove organic matters in waterMeanwhile, the total nitrogen in the water is removed, the carbon source synchronous nitrification and denitrification tank in the ISND has the synchronous nitrification and denitrification function, the removal rate of the total nitrogen is improved, the removal efficiency of the total nitrogen is 70 percent, and Fe generated by the reaction3+The phosphorus in the water is combined to realize chemical phosphorus removal; the low-concentration printing and dyeing wastewater reaches an adjusting tank through a grid and a lift pump room, acid or alkali is added into the adjusting tank to adjust the pH of the wastewater to be less than or equal to 6.5 and less than or equal to 8.5, effluent enters a shallow air flotation tank, PAM and polyferric are added to remove part of dye particles and colloidal organic pollutants, the effluent enters a gradient load aerobic tank and a catalytic enhanced hydrolysis acidification tank to degrade most of organic matters and improve the catalytic performance of the wastewater, the effluent enters a biochemical precipitation tank for precipitation for 2.5 hours after being subjected to reaction in a catalytic enhanced anoxic tank and an ISND carbon source synchronous nitrification and denitrification tank, the effluent enters an ozone advanced catalytic oxidation tank to generate OH with strong oxidation capacity under the action of a catalyst to improve the biodegradability of refractory organic matters, the refractory organic matters in the water are oxidized and decomposed into easily degradable small molecular matters, the effluent enters an advanced treatment stage after being subjected to ozone catalytic oxidation, and then passes through an aeration biological activation filter tank, The treated fiber rotary disc filter reaches the standard of rinsing water.
2. The integrated process for quality-based treatment and recycling of cotton dyeing wastewater according to claim 1, wherein the COD of the high-concentration wastewater in step 1) is 2500-3000 mg/L, and comprises wastewater from dyeing and finishing pretreatment, dyeing wastewater and the 1 st washing water; the COD of the low-concentration wastewater is 400-600 mg/L, and the low-concentration wastewater comprises 2-3 washing water channels.
3. The integrated process for the separate treatment and reuse of cotton dyeing and printing wastewater according to claim 2, wherein the dyeing and finishing process pretreatment comprises any one or more of desizing, scouring, bleaching and mercerizing.
4. The integrated process for the separate treatment and the recycling of the cotton dyeing wastewater according to claim 1, wherein the effluent of the advanced treatment process is used for rinsing and recycling.
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| CN110395855A (en) * | 2019-09-03 | 2019-11-01 | 东华大学 | A comprehensive treatment method for cotton fabric printing and dyeing wastewater |
| CN111039517A (en) * | 2019-12-31 | 2020-04-21 | 台州市环美环保工程技术有限公司 | Treatment process of printing and dyeing wastewater |
| CN115784395A (en) * | 2022-10-09 | 2023-03-14 | 力颖自动化设备（昆山）有限公司 | Recycling method of denim washing wastewater |
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