CN113072261A - Advanced treatment method for textile printing and dyeing wastewater - Google Patents
Advanced treatment method for textile printing and dyeing wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—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
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/54—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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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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
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention relates to the technical field of industrial wastewater treatment, in particular to a method for deeply treating textile printing and dyeing wastewater, which comprises the steps of pretreating, adjusting the printing and dyeing wastewater, and coagulating and precipitating; performing biochemical treatment, namely performing microbial degradation treatment on the precipitated water; and (3) carrying out standard extraction and recycling treatment, carrying out adsorption treatment on biochemical effluent, carrying out solid-liquid separation, continuously separating out an adsorbent to break adsorption balance, then putting the adsorbent into adsorption treatment again, and carrying out reverse osmosis treatment on separated produced water for recycling. Through carrying out preliminary treatment, biochemical treatment and carrying out the mark retrieval and utilization processing with waste water in proper order to adopt constantly to come out the adsorbent separation and break the mode in the absorption processing of throwing into again after the adsorption equilibrium in carrying out the absorption processing of mark retrieval and utilization processing, can be so that the pollutant in the waste water by abundant absorption, thereby reach better waste water treatment effect, waste water treatment is quick, high-efficient moreover.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a deep treatment method for textile printing and dyeing wastewater.
Background
With the rapid development of our society, our country pays more and more attention to the environmental problem, and the discharge standard of industrial wastewater is continuously executed with more strict standard. Meanwhile, with the development of the printing and dyeing industry, dyes used in the printing and dyeing process are more and more complex, the waste water of the printing and dyeing process is more difficult to degrade, and the traditional biochemical treatment and physicochemical treatment processes cannot meet the treatment requirements of the textile printing and dyeing waste water and cannot generate good degradation effect.
Therefore, there is a need in the industry for a solution to the above problems.
Disclosure of Invention
The invention aims to provide a method for deeply treating textile printing and dyeing wastewater, aiming at overcoming the defects of the prior art. The object of the present invention can be achieved by the following technical means.
A textile printing and dyeing wastewater advanced treatment method comprises the following steps:
pretreatment, namely adjusting printing and dyeing wastewater and performing coagulating sedimentation;
performing biochemical treatment, namely performing microbial degradation treatment on the precipitated water;
and (3) carrying out standard extraction and recycling treatment, carrying out adsorption treatment on biochemical effluent, carrying out solid-liquid separation, continuously separating out an adsorbent to break adsorption balance, then putting the adsorbent into adsorption treatment again, and carrying out reverse osmosis treatment on separated produced water for recycling.
Preferably, the printing and dyeing wastewater is regulated and coagulates, and the method comprises the following steps: removing suspended solids in the wastewater through a grid, aerating, homogenizing and homogenizing the wastewater, performing acid-base neutralization reaction to adjust the pH value of the wastewater to 7-8, adding a coagulant and a coagulant aid for reaction, and performing mud-water separation after the reaction.
Preferably, the coagulant is polyaluminium chloride and the coagulant aid is polyacrylamide.
Preferably, the precipitated water is subjected to a microbial degradation treatment comprising: adjusting the pH value of the precipitated water to be within the range of 5.6-6.5, carrying out hydrolytic acidification treatment, and then adjusting the pH value of the wastewater to be within the range of 6.5-7.5 so that the aerobic decomposition nutrition ratio in the wastewater is carbon: nitrogen: carrying out aerobic decomposition treatment after the phosphorus content is 100:5:1, temporarily storing the overflow water, and carrying out aeration biological treatment or refluxing to the front end for repeated treatment according to the overflow water condition.
Preferably, the aerated biological treatment is carried out, comprising: and performing biochemical treatment on the overflow water and realizing nitrification, and performing hydrolytic acidification treatment on the treated internal circulation reflux for a plurality of times and realizing denitrification.
Preferably, the biochemical effluent is subjected to adsorption treatment and solid-liquid separation, and after the adsorbent is continuously separated to break the adsorption balance, the biochemical effluent is put into adsorption treatment again, and the separated produced water is subjected to reverse osmosis treatment and recycled, and the method comprises the following steps: adding activated carbon for adsorption, sending the activated carbon and wastewater into an MBR assembly for solid-liquid separation, continuously carrying out steam-water separation on concentrated water separated by the MBR assembly to separate the activated carbon, circularly putting the separated activated carbon into adsorption treatment for action, feeding produced water separated by the MBR assembly into an RO system for reverse osmosis treatment, repeatedly carrying out biochemical treatment on the concentrated water subjected to reverse osmosis treatment in a backflow manner, and recycling the produced water subjected to reverse osmosis treatment to a process line.
Preferably, when the activated carbon reaches the adsorption saturation state, the concentrated water separated by the MBR module flows back to the pretreatment for coagulating sedimentation.
Preferably, the sludge separated during the wastewater treatment is collected and separated into a filtrate and a sludge cake by a filter press treatment, and the filtrate is returned to the pretreatment site.
Compared with the prior art, the invention has the beneficial effects that:
the invention develops a textile printing and dyeing wastewater advanced treatment method, which can fully adsorb pollutants in wastewater by sequentially carrying out pretreatment, biochemical treatment and upgrading recycling treatment on the wastewater and adopting a mode of continuously separating an adsorbent to break adsorption balance and then putting the adsorbent into adsorption treatment again in the adsorption process of upgrading recycling treatment, thereby achieving better wastewater treatment effect and more quickly and efficiently treating the wastewater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Aiming at the problem that the existing wastewater treatment method cannot meet the standard requirement due to the increasingly complex change of the dye of the textile printing and dyeing wastewater, the invention provides the advanced treatment method of the textile printing and dyeing wastewater, which can effectively solve the common problems of the conventional treatment of the printing and dyeing wastewater, and can treat the wastewater more quickly, efficiently and simply by adopting a novel adsorption mode.
A textile printing and dyeing wastewater advanced treatment method comprises the following steps:
and (4) pretreatment, namely adjusting the printing and dyeing wastewater and performing coagulating sedimentation.
Specifically, the waste water is treated by a grating to remove larger suspended solids in the waste water, the waste water enters an adjusting tank to carry out aeration homogenization and uniform quantity on the waste water, the waste water is uniformly and fully mixed, then the waste water is conveyed to a pH adjusting tank through a lifting pump, acid or alkali is added according to the acidity and alkalinity of the waste water to carry out acid-alkali neutralization reaction, the pH value in the waste water is in a range of 7-8, the coagulation sedimentation is facilitated, and the requirement of biochemical treatment microorganisms on the pH value can be met.
And sequentially flowing to a PAC tank and a PAM tank, and respectively adding a coagulant and a coagulant aid for reaction, wherein the coagulant is polyaluminium chloride (PAC) and mainly acts on coagulating fine inorganic or organic suspended matters in the wastewater into larger flocs. The coagulant aid is Polyacrylamide (PAM), and the polyacrylamide mainly flocculates larger flocs generated by PAC into larger alum flocs which are convenient for sedimentation or floating. After being stirred uniformly and reacted, the mixture enters a sedimentation tank for mud-water separation. The separated sludge is collected and separated into filtrate and sludge cake through the filter press treatment, and the filtrate is returned to the pretreatment part.
And then carrying out biochemical treatment, and carrying out microbial degradation treatment on the precipitated water.
Specifically, the precipitated water enters a hydrolysis acidification tank to regulate the pH value to be within the range of 5.6-6.5, and then hydrolysis acidification treatment is carried out, so that larger organic macromolecules are degraded, and the biodegradability of the wastewater is improved. The hydrolysis acidification treatment is to artificially shorten the four stages of hydrolysis, acidification, acetic acid production and methane production in the anaerobic reaction to the first two stages in advance, reduce the retention time and the tank capacity (floor area), increase the biodegradability and carry out pretreatment for subsequent aerobic treatment. And then, the wastewater enters a contact oxidation tank, the pH value of the wastewater is adjusted to 6.5-7.5, dissolved oxygen is 2-3 mg/L, aerobic decomposition treatment is carried out after the aerobic decomposition nutrition ratio of carbon to nitrogen to phosphorus in the wastewater is 100:5:1, and pollutants such as pulp decomposer, surfactant, oil, waste dye, waste chemical agent, waste alkali, sodium hydrosulfite, anhydrous sodium sulphate, PVA, CMC and the like in the printing and dyeing wastewater are removed. The aerobic decomposition nutrition ratio is as follows: BOD (carbon) Nitrogen phosphorus 100:5: 1. At this time, additional nutrient sources are required, for example, ammonia nitrogen in the wastewater is too high, and the carbon source is too low, so that glucose or methanol is required to be artificially added. So that the microorganism can grow smoothly and further remove the pollutants in the wastewater. The aerobic decomposition treatment can regard the organic pollutants in the wastewater as the nutrients required by the microbial activity and growth and reproduction, the process is that the microbes take the organic pollutants in the wastewater, 1/3 is decomposed and digested, the energy required by the physiological activity is provided, about 2/3 is converted, new cell substances are synthesized, namely the microbes grow and reproduce by themselves, the pollutants are utilized by the organisms, and the wastewater is naturally purified.
The overflow water enters the middle pool for temporary storage, the middle pool can play a role of flexible adjustment, and when the water outlet effect of the contact oxidation pool is not good, the water in the middle pool can be refluxed to the front end of the process treatment for repeated hydrolysis acidification treatment. Meanwhile, the biological aerated filter (BAF tank) is higher in height and cannot automatically flow to the biological aerated filter, so that the intermediate tank is required to temporarily store effluent and then is lifted to the biological aerated filter by a pump for biological aerated treatment.
When the aeration biological treatment is carried out, the overflow water is biochemically treated and nitrified, wherein the biochemical treatment is similar to the previous aerobic decomposition and can be regarded as the secondary aerobic decomposition, and the nitrification is to change ammonia nitrogen into nitrate and nitrite. The treated water is internally circulated and refluxed for a plurality of times to carry out hydrolytic acidification treatment and realize denitrification, and nitrate and nitrite are converted into nitrogen by nitrification so as to reduce the total nitrogen in the wastewater, so that the total nitrogen can be effectively removed only by refluxing the aerobically treated wastewater into a hydrolytic acidification tank for anaerobic denitrification. Therefore, the excessive use of azo dyes in the dyeing step in the printing and dyeing process can be prevented from causing the ammonia nitrogen to exceed the standard, meanwhile, part of pollutants are removed, and the other part of pollutants flow into the adsorption tank to carry out advanced treatment on the wastewater.
After the biochemical treatment of the wastewater is finished, the wastewater is subjected to standard extraction and recycling treatment, biochemical effluent is subjected to adsorption treatment and solid-liquid separation, an adsorbent is continuously separated out to break the adsorption balance and is put into the adsorption treatment again, and the separated produced water is subjected to reverse osmosis treatment and recycled.
Specifically, BAF effluent enters an adsorption tank, activated carbon is added to adsorb some small organic molecules which are not biologically degraded or organic substances which are not biologically degraded, such as dyes with large molecular weight, and the chromaticity index is easy to exceed the standard because the chromaticity of printing and dyeing wastewater is large and the discharge standard has requirements on chromaticity, and the activated carbon can reduce the chromaticity index of the wastewater and is beneficial to reaching the discharge index. Then, the activated carbon and the wastewater are sent into an MBR (membrane bioreactor) together for solid-liquid separation, pollutants such as SS (suspended substances), COD (chemical oxygen demand) and the like in the printing and dyeing wastewater are further removed, and meanwhile, the pollutants can be further intercepted by the fine aperture of the MBR membrane, so that the effluent effect is better than that of the traditional adsorption process.
Concentrated water and produced water are separated after the concentrated water is treated by the MBR assembly, the concentrated water is subjected to gas-water separation, activated carbon obtained after the gas-water separation is circularly put into adsorption treatment for action, the adsorption capacity of the adsorbent is related to adsorption balance, when the adsorbent reaches the adsorption balance, purified water is separated from the adsorbent and then put into unpurified wastewater, the adsorption balance at the moment is broken, the adsorbent can adsorb more organic pollutants again, and the operation cost is saved. And when the activated carbon reaches an adsorption saturation state, returning concentrated water separated by the MBR assembly to pretreatment for coagulating sedimentation, treating the coagulated sedimentation and sludge, and adding new activated carbon to continue adsorption treatment. The produced water separated from the MBR component can be directly discharged up to the standard, but for areas with higher requirements on discharge, further treatment is carried out through an RO system (reverse osmosis system), and at the moment, the MBR component treatment is used as the pretreatment of the RO system, so that a UF pretreatment system arranged in front of a common RO system is saved.
And (3) the produced water separated from the MBR component enters an RO system for reverse osmosis treatment, most pollutants in the water are intercepted, the concentrated water after the reverse osmosis treatment is subjected to reverse osmosis treatment by intercepting most pollutants in the water through reverse osmosis and repeatedly subjected to biochemical treatment, and the produced water after the reverse osmosis treatment is recycled to a process line. Therefore, the adsorption system is combined with the MBR system, the wastewater can be stably discharged up to the standard through adsorption-MBR treatment, the RO system can be treated before water inlet, and a UF pretreatment system arranged before the common RO system is saved.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (8)
1. The advanced treatment method of the textile printing and dyeing wastewater is characterized by comprising the following steps:
pretreatment, namely adjusting printing and dyeing wastewater and performing coagulating sedimentation;
performing biochemical treatment, namely performing microbial degradation treatment on the precipitated water;
and (3) carrying out standard extraction and recycling treatment, carrying out adsorption treatment on biochemical effluent, carrying out solid-liquid separation, continuously separating out an adsorbent to break adsorption balance, then carrying out adsorption treatment again, and carrying out reverse osmosis treatment on separated produced water for recycling.
2. The method for deeply treating the textile printing and dyeing wastewater as claimed in claim 1, wherein the conditioning and coagulating sedimentation of the printing and dyeing wastewater comprises the following steps: removing suspended solids in the wastewater through a grid; secondly, aerating, homogenizing and homogenizing the wastewater; performing acid-base neutralization reaction again to adjust the pH value of the wastewater to 7-8, and then adding a coagulant and a coagulant aid for reaction; and carrying out mud-water separation after the reaction.
3. The method for deeply treating the textile printing and dyeing wastewater as claimed in claim 2, wherein the coagulant is polyaluminium chloride, and the coagulant aid is polyacrylamide.
4. The advanced treatment method for the textile printing and dyeing wastewater as claimed in claim 1, characterized in that the precipitated effluent is subjected to a microbial degradation treatment, which comprises the following steps: adjusting the pH value of the precipitated water to be 5.6-6.5, and performing hydrolytic acidification treatment; and then adjusting the pH value of the wastewater to be within the range of 6.5-7.5, enabling dissolved oxygen to be 2-3 mg/L, enabling the aerobic decomposition nutrition ratio in the wastewater to be 100:5:1, then carrying out aerobic decomposition treatment, temporarily storing overflow water, carrying out aeration biological treatment according to the overflow water condition or refluxing to the front end to repeatedly carry out hydrolytic acidification treatment.
5. The advanced treatment method for textile printing and dyeing wastewater according to claim 4, characterized in that the aeration biological treatment comprises the following steps: and performing biochemical treatment on the overflow water and realizing nitrification, and performing hydrolytic acidification treatment and denitrification on the treated water by performing internal circulation reflux for a plurality of times.
6. The advanced treatment method of textile printing and dyeing wastewater according to claim 1, characterized in that biochemical effluent is subjected to adsorption treatment and solid-liquid separation, and after adsorbent is continuously separated to break adsorption balance, the biochemical effluent is put into adsorption treatment again, and separated produced water is subjected to reverse osmosis treatment and recycled, comprising: adding activated carbon for adsorption, sending the activated carbon and wastewater into an MBR assembly for solid-liquid separation, continuously carrying out gas-water separation on concentrated water separated by the MBR assembly to separate the activated carbon, circularly putting the separated activated carbon into adsorption treatment for action, feeding produced water separated by the MBR assembly into an RO system for reverse osmosis treatment, refluxing the concentrated water subjected to the reverse osmosis treatment for repeated biochemical treatment, and recycling the produced water subjected to the reverse osmosis treatment to a process line.
7. The method for the advanced treatment of the textile printing and dyeing wastewater as claimed in claim 6, characterized in that when the activated carbon reaches the adsorption saturation state, the concentrated water separated by the MBR module is refluxed to the pretreatment for coagulation sedimentation.
8. The advanced treatment method of textile printing and dyeing wastewater as claimed in claim 1, characterized in that the sludge separated during the wastewater treatment process is collected and divided into filtrate and mud cake, and the filtrate is returned to the pretreatment site.
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