Advanced sewage treatment system for printing and dyeing park

Abstract

The utility model relates to the technical field of sewage treatment devices, and discloses a printing and dyeing park sewage advanced treatment system which comprises a pretreatment system, a sewage treatment system, a sewage treatment system, a sewage treatment system, a sewage treatment system, a sewage treatment system and a sewage treatment system, wherein the pretreatment system comprises a dissolved air flotation device, an advanced treatment collection tank, a pre-oxidation-multi-medium filter and an SAO3 catalytic ozonation reactor which are connected in sequence; the pre-oxidation-multi-medium filter is connected with the ozone generation device and the backwashing device, and the SAO3 catalytic ozonation reactor is connected with the ozone generation device and the pretreatment blower device; the post-treatment system comprises a biological filter, a clean water tank and a Pasteur metering tank which are connected in sequence, the biological filter is simultaneously connected with the SAO3 catalytic ozonation reactor, a pre-treatment blower device and a post-treatment blower device, and the clean water tank is connected with a backwashing device. According to the invention, the problems of high difficulty in purification treatment of printing and dyeing sewage and poor treatment effect are solved, the difficulty in purification treatment of printing and dyeing sewage is reduced through advanced treatment on the basis of biochemical effluent, meanwhile, the treatment effect of sewage purification is improved, and the effluent meets the discharge standard.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment devices, in particular to a sewage deep treatment system in a printing and dyeing park. Background Art

[0002] With the rapid development of the economy, all walks of life are continuing to prosper, and the printing and dyeing industry is also developing rapidly. With the continuous increase in the number of printing and dyeing enterprises, the amount of wastewater discharged by printing and dyeing enterprises is increasing. With the emergence of the characteristics of printing and dyeing wastewater such as high toxicity, poor biodegradability, and difficulty in degradation, it is becoming more and more difficult to manage, and the pollution to the environment is getting worse and worse, which has seriously affected people's lives.

[0003] Printing and dyeing wastewater has the following characteristics:

[0004] (1) High chromaticity, high organic content, and low biodegradability. The color and pollutants it contains are mainly formed by natural organic matter and artificially synthesized organic matter. Due to the large-scale use of various dyes in printing and dyeing processing, the chromaticity of discharged wastewater ranges from hundreds to tens of thousands of times. With the use of a large number of new auxiliaries and slurries, the biodegradability of organic pollutants is reduced, the B / C ratio is less than 0.2, the biodegradability is poor, and it is difficult to treat.

[0005] (2) Large pH value changes. Different fiber fabrics use different processes in the printing and dyeing process, and need to be dyed under different pH conditions. Therefore, the pH value of wastewater discharged from the printing and dyeing process of different fiber fabrics is different. Generally speaking, since many processes in the printing and dyeing process of cotton and its blended fabrics require the addition of alkali, the pH value in the wastewater is relatively high.

[0006] (3) Water temperature and water volume vary greatly. Since printing and dyeing are mostly carried out under high temperature conditions, the temperature of the discharged wastewater is relatively high, which is not conducive to biochemical treatment. In addition, due to the different types of processed fabrics, the required dyeing temperature and water volume are also different, which makes the temperature and discharge volume of the discharged wastewater different.

[0007] Therefore, there is an urgent need for a deep classification treatment system that can solve the defects of difficult purification and poor treatment effect of printing and dyeing wastewater. Utility Model Content

[0008] In view of the above problems, the utility model proposes a printing and dyeing park sewage deep treatment system to solve the problem of great difficulty in purifying and treating printing and dyeing sewage and poor treatment effect; to achieve the above purpose, the utility model provides a printing and dyeing park sewage deep treatment system, including:

[0009] A pre-treatment system, the pre-treatment system comprises: a dissolved air flotation device, a deep treatment collection tank, a pre-oxidation-multi-media filter, and an SAO3 ozone catalytic oxidation reactor connected in sequence, the pre-oxidation-multi-media filter is connected to an ozone generator and a backwashing device, and the SAO3 ozone catalytic oxidation reactor is connected to an ozone generator and a pre-treatment blast device;

[0010] The post-treatment system includes: a biological filter, a clean water tank, and a Pasteur metering tank connected in sequence. The biological filter is also connected to a SAO3 ozone catalytic oxidation reactor, a pre-treatment blower device and a post-treatment blower device, and the clean water tank is connected to a backwash device.

[0011] Preferably, the dissolved air flotation device is also connected to a dosing device, and the dosing device is used to store coagulants and flocculants.

[0012] Preferably, a lift pump is installed between the deep treatment collection tank and the pre-oxidation-multi-media filter.

[0013] Preferably, the ozone concentration produced by the SAO3 ozone catalytic oxidation reactor is not less than 120 mg / l.

[0014] Preferably, the SAO3 ozone catalytic oxidation reactor is provided with the following from the bottom layer to the top layer: 16mm-32mm pebbles, 8mm-16mm pebbles, and 3mm-5mm ozone catalyst.

[0015] Preferably, the following materials are arranged in order from the bottom layer to the top layer in the pre-oxidation-multi-media filter: 16mm-32mm pebbles, 8mm-16mm pebbles, 3mm-5mm ozone catalyst, 1mm-2mm quartz sand, and 0.5mm-1mm quartz sand.

[0016] Preferably, the backwashing device is a backwashing water pump.

[0017] Preferably, the ozone generating device is an ozone generator.

[0018] Preferably, the pre-processing air blowing device and the post-processing air blowing device are blowers.

[0019] Preferably, the backwashing device is a backwashing filter.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model can realize the deep treatment on the basis of biochemical effluent, so that the difficulty of purifying printing and dyeing wastewater is reduced, and the treatment effect of wastewater purification is improved, and the effluent meets the discharge standard. The utility model has the advantages of simple process composition, stable operation effect, low investment cost, and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a sewage deep treatment system for a printing and dyeing park according to the utility model. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that when a device or element is referred to as being “connected to” another device or element, it may be directly connected to the other device or element or indirectly connected to the other device or element.

[0025] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] The utility model discloses a sewage deep treatment system for a printing and dyeing park, comprising a pre-treatment system and a post-treatment system, wherein the pre-treatment system is connected with the post-treatment system.

[0028] In this embodiment, the pre-treatment system includes: a dissolved air flotation device, a deep treatment collection tank, a pre-oxidation-multi-media filter, a SAO3 ozone catalytic oxidation reactor, an ozone generator, a backwashing device, and a pre-treatment blast device arranged in sequence;

[0029] A pre-treatment system, the pre-treatment system comprises: a dissolved air flotation device, a deep treatment collection tank, a pre-oxidation-multi-media filter, and an SAO3 ozone catalytic oxidation reactor connected in sequence, the pre-oxidation-multi-media filter is connected to an ozone generator and a backwashing device, and the SAO3 ozone catalytic oxidation reactor is connected to an ozone generator and a pre-treatment blast device;

[0030] The ozone generating device is an ozone generator, which converts oxygen in the air into ozone under the ionization effect of high-voltage and high-frequency electricity. The ozone gas produced by the ozone generator can be directly used to provide an ozone environment for the pre-oxidation-multi-media filter and the SAO3 ozone catalytic oxidation reactor.

[0031] The pre-treatment air blower is a blower that provides an air source for the SAO3 ozone catalytic oxidation reactor, promotes the redox reaction in the biological treatment process, and thus achieves the treatment of sewage.

[0032] The post-treatment system includes: a biological filter, a clean water tank, and a pasteurization tank which are connected in sequence. The biological filter is also connected to a SAO3 ozone catalytic oxidation reactor, a pre-treatment blower and a post-treatment blower, and the clean water tank is connected to a backwashing device.

[0033] The post-treatment air blowing device is the same as the pre-treatment air blowing device, both are blowers, and both provide air sources for the biofilter, providing oxygen and other types of air sources for the biofilter.

[0034] The dissolved air flotation device is a complete set of integrated devices, which is a direct application of the existing technology. Its structural principle will not be repeated here. The function of the dissolved air flotation device is to utilize the different solubility of water under different pressures to pressurize and aerate all or part of the water to be treated (or after treatment), increase the amount of air dissolved in the water, and release it under normal pressure. The air precipitates to form small bubbles, which adhere to the impurity flocs, causing the overall density of the flocs to be less than that of water and rise, thereby separating the solid and liquid.

[0035] The dissolved air flotation device is also connected to a dosing device, which includes a coagulant dosing device and a flocculant dosing device. The dosing device is used to store coagulants and flocculants. The dosing device can aggregate tiny suspended matter and some colloidal substances in the water into larger, easy-to-capture substances that are different from water, thereby enhancing the flotation effect and reducing the operating load of subsequent treatment units.

[0036] The pre-oxidation-multi-media filter has built-in pebbles, quartz sand, and ozone catalysts. While filtering, it also performs ozone catalytic oxidation reactions, allowing the system to selectively pre-oxidize a portion of the substances to be removed with higher concentrations, so that the subsequent SAO3 ozone catalytic oxidation reactor can specifically remove the remaining substances to be removed with slightly lower concentrations, achieving "thick and thin zoning", improving biodegradability, and having higher efficiency and lower effluent pollutant content. The pre-oxidation-multi-media filter is also connected to the clean water tank through a backwash water pump. The pre-oxidation-multi-media filter is a filter with multiple fillers, with built-in 16mm-32mm and 8mm-16mm pebbles as the bottom support layer, 3-5mm ozone catalyst as the middle reaction medium, 1mm-2mm quartz sand as the upper filter material; 0.5mm-1mm quartz sand as the top filter material;

[0037] The SAO3 ozone catalytic oxidation reactor performs advanced oxidation on the remaining substances to be removed based on the pre-oxidation-multi-media filter reaction. Since the pre-oxidation has transformed the sewage from a high-concentration pollution state to a low-concentration pollution state, the SAO3 ozone catalytic oxidation reactor can remove pollutants from sewage in a low-concentration pollution state in a targeted manner, thereby improving the pollutant removal efficiency and effluent indicators. The SAO3 ozone catalytic oxidation reactor is a direct application of existing technology, and its structural principle is no longer repeated here. The SAO3 ozone catalytic oxidation reactor is a reactor with multiple fillers, with built-in 16mm-32mm and 8mm-16mm pebbles as the bottom support layer, and 3-5mm ozone catalyst as the main catalyst medium in the middle layer; the ozone concentration generated by the SAO3 ozone catalytic oxidation reactor is not less than 120mg / l.

[0038] The biofilter is a tank where highly active biofilms grow on the surface of the filter material when sewage flows through it, and the inside of the filter is aerated. When the biofilm matures, the organic pollutants in the sewage are adsorbed and degraded by the microorganisms in the biofilm, thereby being purified. Aerobic and facultative microorganisms grow on the surface of the biofilm, and organic pollutants are degraded by aerobic metabolism of the microorganisms, with the end products being H2O, CO2, NO3, etc. Since oxygen has been exhausted on the surface of the biofilm, the microorganisms in the inner layer of the biofilm are in an anaerobic state, and the anaerobic metabolism of organic matter is carried out, with the end products being organic acids, ethanol, aldehydes, and N2, etc. The filter material itself has the function of intercepting and adsorbing suspended matter in the sewage. In addition, a large number of microorganisms grow on the filter material after bacterial culture. The sticky substances produced by the metabolism of the microorganisms, such as polysaccharides and esters, play an adsorption and bridging role, and are bonded together with the suspended particles and colloidal particles to form fine flocs, which are removed through contact flocculation.

[0039] The deep treatment collection tank is equipped with a lifting pump, and is connected to the pre-oxidation-multi-media filter through the lifting pump. The function of the deep treatment collection tank is to float the gas out of the water and transport it to the pre-oxidation-multi-media filter through the lifting pump, and to ensure the stability of the water inlet of the subsequent treatment unit by adjusting the flow rate.

[0040] The process includes the following steps:

[0041] Step S1, pre-treatment system: the effluent from the biochemical pool enters the dissolved air flotation device, in which the water-insoluble scum is separated from the water, and the scum enters the scum tank of the dissolved air flotation device (this is a conventional component device in the prior art), is transported by a scum pump, and is centrally treated; after the sewage is treated, it enters the deep treatment collection tank, is sent to the pre-oxidation-multi-media filter by a lifting pump, is pre-oxidized and filtered, and then enters the SAO3 ozone catalytic oxidation reactor for deep oxidation, improves the biodegradability of the water, reduces the chromaticity of the water, and then enters the post-treatment system.

[0042] Step S2, post-treatment system: After the sewage is treated by the pre-treatment device for physical and chemical treatment, it enters the biofilter, and through the biochemical action of the biofilter, the pollutants are further reduced, the predetermined effluent indicators are met, and the discharge is finally measured by the Pasteur metering tank.

[0043] The utility model can achieve the effluent meeting the discharge standard through deep treatment on the basis of biochemical effluent. The utility model has the advantages of simple process composition, stable operation effect, less civil buildings and structures, low investment cost, simple operation, etc. It is highly targeted for projects that meet the requirements.

[0044] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A printing and dyeing park sewage deep treatment system, characterized in that: include: A pre-treatment system, the pre-treatment system comprising: a dissolved air flotation device, a deep treatment collection tank, a pre-oxidation-multi-media filter, and an SAO3 ozone catalytic oxidation reactor connected in sequence, the pre-oxidation-multi-media filter is connected to an ozone generator and a backwashing device, and the SAO3 ozone catalytic oxidation reactor is connected to an ozone generator and a pre-treatment blast device; The post-treatment system comprises: a biological filter, a clean water tank, and a pasteurization tank connected in sequence; the biological filter is simultaneously connected to a SAO3 ozone catalytic oxidation reactor, a pre-treatment blower device, and a post-treatment blower device; and the clean water tank is connected to a backwashing device.

2. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The dissolved air flotation device is also connected to a dosing device, and the dosing device is used to store coagulants and flocculants.

3. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: A lifting pump is installed between the deep treatment collection tank and the pre-oxidation-multi-media filter.

4. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The ozone concentration generated by the SAO3 ozone catalytic oxidation reactor is not less than 120 mg / l.

5. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The SAO3 ozone catalytic oxidation reactor is provided with the following components in order from the bottom layer to the top layer: 16mm-32mm pebbles, 8mm-16mm pebbles, and 3mm-5mm ozone catalysts.

6. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The pre-oxidation-multi-media filter is provided with the following materials from the bottom layer to the top layer: 16mm-32mm pebbles, 8mm-16mm pebbles, 3mm-5mm ozone catalyst, 1mm-2mm quartz sand, and 0.5mm-1mm quartz sand.

7. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The backwashing device is a backwashing water pump.

8. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The ozone generating device is an ozone generator.

9. The printing and dyeing park sewage deep treatment system according to claim 1 is characterized in that: The pre-processing air blowing device and the post-processing air blowing device are blowers.

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