Textile sewage reclaimed water reuse water treatment system

Abstract

The invention discloses a textile sewage reclaimed water reuse water treatment system which comprises the following steps: S1, introducing textile sewage into a primary sewage pool, and further filtering through a coarse screen and a fine screen; s2, introducing the preliminarily filtered sewage in the primary sewage pool into a secondary sewage pool; s3, sewage in the secondary sewage pool is guided into a catalytic pool, S4, sewage treated in the catalytic pool is guided into a reaction pool, S5, water treated in the catalytic pool is guided into a recovery pool, and S6, water in the catalytic pool is guided into a clean water pool. According to the method, the FeO-coated MOF nano-catalyst and the Fenton-like reaction are introduced, and UV-LED light source excitation is combined, so that macromolecular dyes and auxiliaries in sewage are rapidly degraded; further decomposing organic matters by utilizing an electroactive microbial agent, reducing COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand), simultaneously promoting removal of nitrogen and phosphorus and reducing eutrophication of the water body; finally, through an electrodialysis device and an ACS membrane technology, salt ions in the wastewater are effectively removed, the water quality is improved, and recycling of resources is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a textile wastewater reuse water treatment system. Background Art

[0002] The textile industry generates a large amount of wastewater during the production process. These wastewaters not only contain high concentrations of macromolecular substances such as organic dyes and auxiliaries, but are also rich in nutrients such as nitrogen and phosphorus, as well as salt ions, posing a serious threat to the water environment. Traditional textile wastewater treatment methods often focus on the application of a single treatment technology, such as physical precipitation, chemical oxidation or biodegradation, but these methods have many limitations in terms of treatment efficiency, treatment cost and resource recovery.

[0003] The macromolecular dyes and auxiliaries in textile wastewater have complex structures and are difficult to degrade. Although traditional chemical oxidation methods such as the use of chlorine and ozone have certain effects, they are costly and may cause secondary pollution.

[0004] Nutrients such as nitrogen and phosphorus contained in textile wastewater are one of the main causes of eutrophication of water bodies. Although traditional biological treatment processes such as activated sludge method can remove some nitrogen and phosphorus, their efficiency is not high and they are easily affected by water quality fluctuations.

[0005] Textile wastewater often contains high salinity, which creates obstacles to the subsequent reuse of water resources. Although traditional reverse osmosis, electrodialysis and other technologies can effectively remove salt ions, they have high energy consumption and high requirements for equipment. At the same time, trace organic matter and inorganic salt ions remaining in the wastewater will also affect the transparency and safety of the effluent water quality. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a textile wastewater reuse water treatment system.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention discloses a textile wastewater reuse water treatment system, comprising: S1. The textile wastewater is introduced into the primary sewage pool, and initially filtered through a coarse screen to remove large suspended solids in the wastewater, and then further filtered through a fine screen to remove smaller suspended solids and floating matter in the wastewater, such as fiber fragments, paper scraps, fine particles, etc., to improve the effluent quality; S2, introducing the sewage initially filtered in the primary sewage pool into the secondary sewage pool and filtering it through a precision filter; S3, the sewage in the secondary sewage pool is introduced into the catalytic pool, and Fe3O4@MOF nanocatalyst is added. Through the Fenton-like reaction, the dissolved oxygen in the wastewater is used to generate active oxygen free radicals to quickly degrade macromolecular dyes and additives. The reaction time is 30-45 minutes. A UV-LED light source emitting device is set on the top of the catalytic pool, and by coupling the UV-LED light source, it stimulates the electron transition on the catalyst surface and improves the oxidation efficiency; S4. The wastewater treated in the catalytic tank is introduced into the reaction tank and electroactive bacteria are added to effectively decompose organic matter such as dyes, additives, fiber fragments, etc., reduce the chemical oxygen demand and biological oxygen demand of the wastewater, thereby improving water quality, and promoting the removal of nutrients such as nitrogen and phosphorus, reducing the risk of eutrophication of water bodies. The reaction tank is equipped with a PVDF membrane, which can effectively intercept suspended solids, colloids, bacteria, viruses and other harmful substances in the sewage to ensure clear and transparent effluent water quality; S5. The treated water in the catalytic pool is introduced into the recovery pool. The electrodialysis device is used to perform electrodialysis on the sewage, which can effectively remove the salt ions in the wastewater, reduce the conductivity, improve the water quality, separate these salt substances from the wastewater, and realize the recycling of resources. The catalytic tank is equipped with an ACS membrane, through which the salt substances separated from the sewage can be effectively recovered and treated; S6. The water in the catalytic pool is introduced into the clean water pool, and the water in the catalytic pool is disinfected by a flow-through ultraviolet disinfection device, and then introduced into the workshop for recycling.

[0008] As a preferred technical solution of the present invention, the gap of the coarse grid in S1 is 5-10 mm, the gap of the fine grid in S1 is 1-5 mm, the cleaning cycle of the coarse grid is 1-3 days, and the cleaning cycle of the fine grid is 1 day.

[0009] As a preferred technical solution of the present invention, the dosage density of the Fe3O4@MOF nanocatalyst in S3 is 150-200 g / m³, the particle size is 50nm, the specific surface area is 800 m² / g, the power density of the UV-LED light source emitting device is 80-100 W / m³, the wavelength is 365nm, and the light intensity is 15 mW / cm².

[0010] As a preferred technical solution of the present invention, the density of the electroactive bacterial agent added in S4 is 50g / m³, the PVDF membrane flux is 15-20 L / (m²·h), and the nanosilver content is 0.5 wt%.

[0011] As a preferred technical solution of the present invention, the area of ​​the ACS membrane in S5 is 0.8-1.2 m² / m³ of wastewater, and the monovalent ion migration number is greater than 0.9, the voltage of the electrodialysis device is 0.8-1.2 V / cell, and ΔT is less than 5%.

[0012] As a preferred technical solution of the present invention, the irradiation intensity of the over-flow ultraviolet disinfection device is 40mJ / cm².

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention introduces Fe3O4@MOF nanocatalyst and Fenton-like reaction, combined with UV-LED light source excitation, to quickly degrade macromolecular dyes and additives in sewage; then uses electroactive bacteria to further decompose organic matter, reduce COD and BOD, and promote nitrogen and phosphorus removal, reducing eutrophication of water bodies; finally, through electrodialysis equipment and ACS membrane technology, salt ions in wastewater are effectively removed, water quality is improved, and resource recycling is achieved, ensuring clear and transparent effluent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a flow chart of the present invention; DETAILED DESCRIPTION The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0015] The invention provides a textile wastewater reuse water treatment system, comprising: S1. The textile wastewater is introduced into the primary sewage pool, and initially filtered through a coarse screen to remove large suspended solids in the wastewater, and then further filtered through a fine screen to remove smaller suspended solids and floating matter in the wastewater, such as fiber fragments, paper scraps, fine particles, etc., to improve the effluent quality; S2, introducing the sewage initially filtered in the primary sewage pool into the secondary sewage pool and filtering it through a precision filter; S3, the sewage in the secondary sewage pool is introduced into the catalytic pool, and Fe3O4@MOF nanocatalyst is added. Through the Fenton-like reaction, the dissolved oxygen in the wastewater is used to generate active oxygen free radicals to quickly degrade macromolecular dyes and additives. The reaction time is 30-45 minutes. A UV-LED light source emitting device is set on the top of the catalytic pool, and by coupling the UV-LED light source, it stimulates the electron transition on the catalyst surface and improves the oxidation efficiency; S4. The wastewater treated in the catalytic tank is introduced into the reaction tank and electroactive bacteria are added to effectively decompose organic matter such as dyes, additives, fiber fragments, etc., reduce the chemical oxygen demand and biological oxygen demand of the wastewater, thereby improving water quality, and promoting the removal of nutrients such as nitrogen and phosphorus, reducing the risk of eutrophication of water bodies. The reaction tank is equipped with a PVDF membrane, which can effectively intercept suspended solids, colloids, bacteria, viruses and other harmful substances in the sewage to ensure clear and transparent effluent water quality; S5. The treated water in the catalytic pool is introduced into the recovery pool. The electrodialysis device is used to perform electrodialysis on the sewage, which can effectively remove the salt ions in the wastewater, reduce the conductivity, improve the water quality, separate these salt substances from the wastewater, and realize the recycling of resources. The catalytic tank is equipped with an ACS membrane, through which the salt substances separated from the sewage can be effectively recovered and treated; S6. The water in the catalytic pool is introduced into the clean water pool, and the water in the catalytic pool is disinfected by a flow-through ultraviolet disinfection device, and then introduced into the workshop for recycling.

[0016] Furthermore, the gap of the coarse grid in S1 is 5-10 mm, the gap of the fine grid in S1 is 1-5 mm, the cleaning cycle of the coarse grid is 1-3 days, and the cleaning cycle of the fine grid is 1 day.

[0017] Furthermore, the irradiation intensity of the over-flow UV disinfection device is 40mJ / cm².

[0018] Example 1 The density of Fe3O4@MOF nanocatalyst is 100g / m³, its particle size is 50nm, and its specific surface area is 800 m² / g. The power density of the UV-LED light source is 90 W / m³, the wavelength is 365nm, and the light intensity is 15 mW / cm². The density of electroactive bacterial agent is 30g / m³, the flux of PVDF membrane is 18L / (m²·h), the content of nanosilver is 0.5wt%, The area of ​​ACS membrane is 0.6m² / m³ wastewater, and the monovalent ion migration number is >0.9, the voltage of electrodialysis device is 1V / cell, and ΔT is <5%.

[0019] Example 2 The density of Fe3O4@MOF nanocatalyst is 150 g / m³, its particle size is 50nm, and its specific surface area is 800 m² / g. The power density of the UV-LED light source is 90 W / m³, the wavelength is 365nm, and the light intensity is 15 mW / cm². The density of the electroactive bacterial agent is 50g / m³, the flux of the PVDF membrane is 18 L / (m²·h), and the nanosilver content is 0.5wt%. The area of ​​ACS membrane is 1m² / m³ wastewater, and the monovalent ion migration number is >0.9, the voltage of the electrodialysis device is 1V / cell, and ΔT is <5%.

[0020] Example 3 The density of Fe3O4@MOF nanocatalyst is 200 g / m³, its particle size is 50nm, and its specific surface area is 800 m² / g. The power density of the UV-LED light source is 90 W / m³, the wavelength is 365nm, and the light intensity is 15 mW / cm². The density of the electroactive bacterial agent is 70g / m³, the flux of the PVDF membrane is 18L / (m²·h), and the content of nanosilver is 0.5 wt%. The area of ​​ACS membrane is 1.5m² / m³ wastewater, and the monovalent ion migration number is >0.9, the voltage of electrodialysis device is 1V / cell, and ΔT is <5%.

[0021] Table 1:

[0022] Table 2:

[0023] Table 3:

[0024] As shown in Table 1: 1. 150-200 g / m³ catalyst + 80 W / m³ UV achieves the best cost-effectiveness. The macromolecular dyes are decomposed into small molecular organic matter such as acetic acid and propionic acid, which improves the efficiency of subsequent biological treatment.

[0025] 2. Too little catalyst added (<200 g / m³) leads to reduced energy consumption of magnetic recovery.

[0026] As shown in Table 2: 1. 50-70 g / m³ bacterial agent + 18 L / (m²·h) membrane flux achieves a balance between biodegradation and membrane pollution, with a higher COD removal rate (>95%) and a longer membrane pollution cycle.

[0027] 2. When the concentration of bacterial agent is too low (<50 g / m³), the COD removal rate is low (<95%) and the membrane fouling cycle is low.

[0028] As shown in Table 3: 1. When the membrane area is 1.0 -1.5m² / m³ + 1.0 V / cell voltage, the Cl⁻ / SO4²⁻ separation factor reaches 12.5, the purity of the crystallized salt is increased to 99.2%, and calcium sulfate scaling is avoided (scaling rate is reduced by 83%).

[0029] 2. The membrane area is too small (<1m² / m³), resulting in a decrease in NaCl recovery rate (<85%) and sulfate retention rate (<93%).

[0030] In summary, the present invention introduces Fe3O4@MOF nanocatalysts and Fenton-like reactions, combined with UV-LED light source excitation, to quickly degrade macromolecular dyes and additives in sewage; then uses electroactive bacteria to further decompose organic matter, reduce COD and BOD, and promote nitrogen and phosphorus removal, reducing eutrophication of water bodies; finally, through electrodialysis devices and ACS membrane technology, salt ions in wastewater are effectively removed, water quality is improved, and resource recycling is achieved, ensuring that the effluent quality is clear and transparent.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A textile wastewater reuse water treatment system, characterized in that: include: S1. The textile wastewater is introduced into the primary sewage pool, and initially filtered through a coarse screen to remove large suspended solids in the wastewater, and then further filtered through a fine screen to remove smaller suspended solids and floating matter in the wastewater, such as fiber fragments, paper scraps, fine particles, etc., to improve the effluent quality; S2, introducing the sewage initially filtered in the primary sewage pool into the secondary sewage pool and filtering it through a precision filter; S3, the sewage in the secondary sewage pool is introduced into the catalytic pool, and Fe3O4@MOF nanocatalyst is added. Through the Fenton-like reaction, the dissolved oxygen in the wastewater is used to generate active oxygen free radicals to quickly degrade macromolecular dyes and additives. The reaction time is 30-45 minutes. A UV-LED light source emitting device is set on the top of the catalytic pool, and by coupling the UV-LED light source, it stimulates the electron transition on the catalyst surface and improves the oxidation efficiency; S4. The wastewater treated in the catalytic tank is introduced into the reaction tank and electroactive bacteria are added to effectively decompose organic matter such as dyes, additives, fiber fragments, etc., reduce the chemical oxygen demand and biological oxygen demand of the wastewater, thereby improving water quality, and promoting the removal of nutrients such as nitrogen and phosphorus, reducing the risk of eutrophication of water bodies. The reaction tank is equipped with a PVDF membrane, which can effectively intercept suspended solids, colloids, bacteria, viruses and other harmful substances in the sewage to ensure clear and transparent effluent water quality; S5. The treated water in the catalytic pool is introduced into the recovery pool. The electrodialysis device is used to perform electrodialysis on the sewage, which can effectively remove the salt ions in the wastewater, reduce the conductivity, improve the water quality, separate these salt substances from the wastewater, and realize the recycling of resources. The catalytic tank is equipped with an ACS membrane, through which the salt substances separated from the sewage can be effectively recovered and treated; S6. The water in the catalytic pool is introduced into the clean water pool, and the water in the catalytic pool is disinfected by a flow-through ultraviolet disinfection device, and then introduced into the workshop for recycling.

2. A textile wastewater reuse water treatment system according to claim 1, characterized in that: The gap between the coarse grid in S1 is 5-10 mm, the gap between the fine grid in S1 is 1-5 mm, the cleaning cycle of the coarse grid is 1-3 days, and the cleaning cycle of the fine grid is 1 day.

3. A textile wastewater reuse water treatment system according to claim 1, characterized in that: The dosage density of the Fe3O4@MOF nanocatalyst in the S3 is 150-200 g / m³, the particle size is 50nm, the specific surface area is 800 m² / g, the power density of the UV-LED light source emitting device is 80-100 W / m³, the wavelength is 365nm, and the light intensity is 15 mW / cm².

4. A textile wastewater reuse water treatment system according to claim 1, characterized in that: The density of the electroactive bacterial agent added in S4 is 50-70 g / m³, the PVDF membrane flux is 15-20 L / (m²·h), and the nanosilver content is 0.5 wt%.

5. A textile wastewater reuse water treatment system according to claim 1, characterized in that: The area of ​​the ACS membrane in S5 is 0.8-1.2 m² / m³ of wastewater, and the monovalent ion migration number is greater than 0.9, the voltage of the electrodialysis device is 0.8-1.2 V / cell, and ΔT is less than 5%.

6. A textile wastewater reuse water treatment system according to claim 1, characterized in that: The irradiation intensity of the over-flow ultraviolet disinfection device is 40mJ / cm².

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