CN108373240B - Quality-based treatment and recycling integrated process for cotton printing and dyeing wastewater - Google Patents
Quality-based treatment and recycling integrated process for cotton printing and dyeing wastewater Download PDFInfo
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Abstract
The invention discloses a quality-divided treatment and recycling integrated process for cotton printing and dyeing wastewater, which is characterized in that the cotton printing and dyeing wastewater is subjected to quality-divided collection according to the concentration and the characteristics of pollutants and the concentration and is divided into high-concentration wastewater and low-concentration wastewater; 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 invention can effectively improve the resource utilization rate of the waste water while realizing the standard discharge and the quality-based recycling of the cotton printing and dyeing waste water in enterprises and effectively removing the refractory dye and the aniline and the auxiliary agent derived from the refractory dye. 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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| CN108862943B (en) * | 2018-09-11 | 2023-07-28 | 尚川（北京）水务有限公司 | Adjustable biomembrane-activated sludge sewage treatment method and device |
| CN110395855A (en) * | 2019-09-03 | 2019-11-01 | 东华大学 | A kind of integrated conduct method of cotton dyeing waste water |
| 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 |
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