Organic wastewater pretreatment device

Abstract

The utility model discloses an organic wastewater pretreatment device which comprises a shell, a mixer, an aerator, a temperature regulator, a skimmer and a filler filter, and is characterized in that the shell is sequentially divided into a mixing area, a reaction area and a separation area from left to right; a wastewater inlet, an oxidant inlet and an acid-base medicament inlet are respectively formed in the shell of the mixing area; a mixer is mounted in the shell of the mixing area; an aerator is arranged at the lower part in the shell of the reaction area, the aerator is connected with an external aeration fan through a pipeline, a skimmer is arranged at the upper part of the shell of the reaction area, a temperature regulator is arranged in the shell of the reaction area, and the temperature regulator is connected with an external PLC (Programmable Logic Controller); a filler filter is arranged in the shell of the separation area, and a wastewater outlet is formed in the shell of the separation area. The device disclosed by the utility model is high in adaptability, high in treatment speed and small in occupied area, and can be adjusted according to the characteristics of different wastewater, so that the device can meet the pretreatment requirements of various types of wastewater.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and in particular relates to a device for pre-treating organic wastewater. Background Art

[0002] Among the large amount of wastewater generated in the existing industrial production process, there is a type of wastewater that contains a large amount of inorganic salts and also contains a large amount of high-concentration organic matter. Its characteristics are as follows:

[0003] 1. High concentration of organic matter. The COD concentration in each liter of wastewater is as high as tens of thousands or even hundreds of thousands of milligrams.

[0004] 2. Complex composition. The organic matter in wastewater containing toxic substances is mainly aromatic compounds and heterocyclic compounds, and also contains sulfides, nitrides, heavy metals and toxic organic matter.

[0005] 3. High chromaticity and odor. Some wastewater emits a pungent odor, causing adverse effects on the surrounding environment.

[0006] 4. Strong acid and alkalinity. There are many acids and alkalis in the organic wastewater produced by industry, and they are often strong acids or alkalinities.

[0007] 5. Not easy to biodegrade. The organic pollutants contained in organic wastewater have complex structures, poor biodegradability, and are toxic to microorganisms, making them difficult to treat with general biochemical methods.

[0008] The existing treatment method for this kind of high-salt and high-concentration organic wastewater is generally to treat the wastewater by evaporation desalination + biochemical treatment. However, in the desalination process, since the organic matter in the wastewater cannot be removed, the inorganic salts after evaporation desalination and the wastewater after evaporation and condensation are colored, which makes it impossible to reuse the inorganic salt products. The subsequent biochemical treatment of wastewater is difficult to decolorize, resulting in the wastewater color failing to meet the discharge standards. Summary of the invention

[0009] The purpose of the utility model is to provide a pretreatment device for treating high-salt and high-concentration organic wastewater in view of the problems existing in the existing technology for high-salt and high-concentration organic wastewater. By effectively pretreating the wastewater, the organic matter content in the wastewater is reduced, so that the inorganic salts in the subsequent wastewater evaporation and desalination treatment and the color of the wastewater after evaporation and condensation are lightened and removed, so that the inorganic salt products can be effectively reused, the COD index of the wastewater is reduced, and it is ensured that the biochemical method can be used for subsequent treatment, and the wastewater treated by the biochemical method does not have the problem of discoloration. The device has the characteristics of strong adaptability and simple operation.

[0010] The technical solution adopted by the utility model is:

[0011] An organic wastewater pretreatment device comprises a shell, a mixer, an aerator, a temperature regulator, a skimmer, and a packing filter, and is characterized in that: the shell is divided into a mixing zone, a reaction zone, and a separation zone from left to right; a wastewater inlet, an oxidant inlet, and an acid-base agent inlet are respectively provided on the shell of the mixing zone, and a mixer is installed in the shell of the mixing zone; an aerator is provided at the lower part of the shell of the reaction zone, and the aerator is connected to an external aeration fan through a pipeline; a skimmer is provided at the upper part of the shell of the reaction zone, a temperature regulator is installed in the shell of the reaction zone, and the temperature regulator is connected to an external PLC controller; a packing filter is provided in the shell of the separation zone, and a wastewater outlet is provided on the shell of the separation zone.

[0012] The shell is made of carbon steel, stainless steel, carbon steel lined with rubber, PVC or PP. The shell can be designed with normal pressure opening or closed pressure.

[0013] The aerator is composed of a plurality of microporous aeration heads, which are evenly distributed at the lower part of the shell of the reaction zone, so that the gas passes through the aeration heads to evenly aerate the wastewater in the reaction zone.

[0014] The temperature regulator adopts a serpentine tube, and the two ends of the serpentine tube are installed on both sides of the shell of the reaction zone to heat the wastewater entering the reaction zone to reach the optimal reaction temperature.

[0015] The skimmer is driven by a chain and a motor and is installed on the upper part of the shell of the reaction zone. Through the operation of the skimmer plate, the scum generated in the reaction zone is scraped into the slag tank for discharge.

[0016] The filler filter is a filter formed by stacking a variety of fillers, which is installed in the housing of the filter area. The suspended matter generated in the reaction area is effectively removed through the various stacked fillers.

[0017] A pH meter is also installed in the shell of the mixing zone. The pH meter is connected to an external PLC controller. The pH meter contacts the material in the mixing zone through a probe to measure and monitor the pH value of the material. The measured data is used by the external PLC controller to control and adjust the regulating valve and metering pump on the external acid and alkali agent addition pipeline. In this way, the addition amount of acid and alkali agents can be unmanned and accurate.

[0018] An oxidant dosage detector is installed in the shell of the reaction zone. The oxidant dosage detector is connected to an external PLC controller. The oxidant dosage detector contacts the materials in the reaction zone through a probe to measure and monitor the amount of oxidant in the mixed material. The measured data is used by an external PLC controller to control and adjust the regulating valve and metering pump on the external oxidant addition pipeline. In this way, the addition amount of oxidant can be unmanned and accurate.

[0019] A temperature transmitter is installed in the shell of the reaction zone. The temperature transmitter is connected to an external PLC controller. The temperature transmitter contacts the material in the reaction zone through a probe to measure and monitor the reaction temperature of the material. The measured data is used to control and adjust the temperature controller through an external PLC controller to effectively monitor the wastewater temperature in the reaction zone, so that the temperature of the entire reaction zone is always stable at the optimal temperature for the reaction, thereby realizing automatic control.

[0020] The serpentine tube is made of a smooth tube, a fin tube or a hollow heat pipe.

[0021] When the utility model device is used, the supporting devices include: an oxidant adding device, an acid-base dosing device, a wastewater lifting pump, an aeration fan, etc. The oxidant enters the shell from the oxidant inlet on the shell through a pipeline after passing through the oxidant adding device and the metering pump; the acid-base reagent enters the shell from the acid-base reagent inlet on the shell through a pipeline after passing through the acid-base dosing device and the metering pump; the wastewater enters the shell from the wastewater inlet on the shell through a pipeline after passing through the wastewater lifting pump; the aerator is connected to the external aeration fan through a pipeline; the mixer adopts mechanical stirring to adjust the pH value of the wastewater so that it meets the requirements of subsequent reactions.

[0022] When the utility model device is used, a combination form is adopted to combine chemical reaction, physical separation and other processes in a set of mechanical structures, and the device is used to effectively adjust the acidity and alkali and temperature of the wastewater, so that the wastewater reaches the best state for reaction with the oxidant, and then the oxidation reaction is carried out after being fully mixed with the oxidant, so that a large amount of organic matter in the wastewater is oxidized into carbon dioxide and water, so as to reduce the COD index of the wastewater, reduce the pungent smell of the wastewater, reduce the chromaticity of the wastewater, etc. The device has strong adaptability, fast processing speed, and efficient floor space. It can be adjusted according to the characteristics of different wastewaters, so that it can meet the pretreatment requirements of various wastewaters. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the utility model in conjunction with the accompanying drawings and specific embodiments, which is convenient for a clear understanding of the utility model, but they do not limit the utility model. The mixer 2, aerator 3, temperature regulator 4, skimmer 5, filler filter 6, pH meter 7, oxidant dosage detector 8, and temperature transmitter 9 of the utility model are all existing structures and are directly purchased.

[0025] like Figure 1As shown, the device of the utility model includes a shell 1, a mixer 2, an aerator 3, a temperature regulator 4, a skimmer 5, a packing filter 6, a pH meter 7, an oxidant meter 8, and a temperature transmitter 9. It is characterized in that: the shell 1 is divided into a mixing zone, a reaction zone, and a separation zone from left to right; the shell 1 of the mixing zone is respectively provided with a wastewater inlet, an oxidant inlet, and an acid and alkali agent inlet, and the mixer 2 is installed in the shell 1 of the mixing zone; the lower part of the shell 1 of the reaction zone is provided with an aerator 3, and the aerator 3 is connected to an external aeration fan through a pipeline, and the upper part of the shell 1 of the reaction zone is provided with a skimmer 5, and the shell 1 of the reaction zone is equipped with a temperature regulator 4, and the temperature regulator 4 is connected to an external PLC controller; the shell 1 of the separation zone is provided with a packing filter 6, and the shell 1 of the separation zone is provided with a wastewater outlet. The shell is made of carbon steel, stainless steel, carbon steel lining rubber, PVC or PP. The shell can be designed with an open port at normal pressure or a closed pressure design.

[0026] The mixer uses mechanical stirring to adjust the pH value of the wastewater so that it meets the requirements of subsequent reactions.

[0027] The aerator 3 is composed of a plurality of microporous aeration heads, which are evenly distributed in the lower part of the shell 1 in the reaction zone, so that the gas passes through the aeration heads to evenly aerate the wastewater in the reaction zone.

[0028] The temperature regulator 4 is a serpentine tube, and the two ends of the serpentine tube are installed on both sides of the shell 1 of the reaction zone to heat the wastewater entering the reaction zone to reach the optimal reaction temperature. The serpentine tube can be made of a light tube, a fin tube or a hollow heat pipe.

[0029] The skimmer 5 is driven by a chain and a motor and is installed on the upper part of the shell 1 in the reaction zone. The skimmer plate scrapes the scum generated in the reaction zone into the slag tank for discharge.

[0030] The filler filter 6 is a filter formed by stacking a variety of fillers, which is installed in the housing 1 of the filter area. The suspended matter generated in the reaction area is effectively removed through the various stacked fillers.

[0031] A pH meter 7 is installed in the shell 1 of the mixing zone. The pH meter 7 is connected to an external PLC controller. The pH meter 7 contacts the material in the mixing zone through a probe to measure and monitor the pH value of the material. The measured data is used to control and adjust the regulating valve and metering pump on the external acid and alkali agent addition pipeline. In this way, the addition amount of acid and alkali agents can be unmanned and accurate.

[0032] An oxidant dosage detector 8 is installed in the shell 1 of the reaction zone. The oxidant dosage detector 8 is connected to an external PLC controller. The oxidant dosage detector 8 contacts the materials in the mixing zone through a probe to measure and monitor the amount of oxidant in the mixed material. The measured data is used by the external PLC controller to control and adjust the regulating valve and metering pump on the external oxidant addition pipeline. In this way, the addition amount of the oxidant can be unmanned and accurate.

[0033] A temperature transmitter 9 is installed in the shell 1 of the reaction zone. The temperature transmitter 9 is connected to an external PLC controller. The temperature transmitter 9 contacts the material in the reaction zone through a probe to measure and monitor the reaction temperature of the material. The measured data is used to control and adjust the temperature controller through an external PLC controller to effectively monitor the wastewater temperature in the reaction zone, so that the temperature of the entire reaction zone is always stabilized at the optimal temperature of the reaction, thereby realizing automatic control.

[0034] When the utility model device is used, the supporting devices include: an oxidant adding device, an acid-base dosing device, a wastewater lifting pump, an aeration fan, etc. The oxidant passes through the oxidant adding device and the metering pump and enters the shell 1 through the pipeline from the oxidant inlet on the shell 1; the acid-base reagent passes through the acid-base dosing device and the metering pump and enters the shell 1 through the pipeline from the acid-base reagent inlet on the shell 1; the wastewater passes through the wastewater lifting pump and enters the shell 1 through the pipeline from the wastewater inlet on the shell 1; the aerator is connected to the external aeration fan through the pipeline; the mixer adopts mechanical stirring to adjust the pH value of the wastewater so that it meets the requirements of subsequent reactions. The specific use steps are as follows:

[0035] Step 1: The wastewater is sent to the mixing area of ​​the device through the wastewater lifting pump and pipeline. In the pipeline before entering the mixing area, it is first mixed with the acid or alkali agent sent in at the same time, and then the pH value is adjusted to a suitable range, and then effectively mixed with the oxidant sent in. A mixer is installed in the mixing area. The mixer is a mechanical stirrer. After the wastewater after the initial mixing enters the mixing area, it is mixed again by mechanical stirring of the mixer. The mixed wastewater enters the reaction area through the lower connection port.

[0036] Since a pH meter is installed in the mixing area, the pH meter contacts the materials in the mixing area through the probe to measure and monitor the pH value of the materials; the measured data is used by the external PLC controller to control and adjust the regulating valve and metering pump on the external acid and alkali agent addition pipeline. In this way, the addition amount of acid and alkali agents can be unmanned and accurate.

[0037] Step 2: After the mixed wastewater enters the reaction zone, it stays there for a period of time. The temperature of the wastewater is adjusted to a suitable reaction temperature (can be raised or lowered) by the temperature controller installed on the side of the reaction zone. The wastewater reacts quickly and effectively with the oxidant at a suitable pH value and reaction temperature. During the reaction, the aerator installed at the bottom of the reaction zone fully aerates the wastewater with micropores. The foam and particles generated by the oxidation reaction in the wastewater are discharged to the surface of the reaction zone to form scum through aeration. Then, the scum is discharged to the slag discharge tank for separation through the work of the skimmer installed on the top of the reaction zone. The separated wastewater enters the separation zone by overflowing from the top.

[0038] Since an oxidant dosage detector is installed in the reaction zone, the oxidant dosage detector contacts the materials in the mixing zone through the probe to measure and monitor the amount of oxidant in the mixed material; the measured data is used by an external PLC controller to control and adjust the regulating valve and metering pump on the external oxidant addition pipeline. In this way, the addition amount of oxidant can be unmanned and accurate.

[0039] Since a temperature transmitter is installed in the shell of the reaction zone, the temperature transmitter contacts the material in the reaction zone through a probe to measure and monitor the reaction temperature of the material; the measured data is used to control and adjust the temperature controller through an external PLC controller to effectively monitor the wastewater temperature in the reaction zone, so that the temperature of the entire reaction zone is always stable at the optimal temperature for the reaction, thereby realizing automatic control.

[0040] Step 3: The separated wastewater entering the separation zone is separated from particles again through the packing filter, and the fine particles produced by the oxidation reaction are intercepted and removed again. The wastewater passes through the packing filter from top to bottom, and the fine particles in the wastewater are intercepted by the packing filter and remain on the packing, thereby effectively separating from the wastewater. The separated wastewater enters the subsequent evaporation desalination device for further treatment.

[0041] When the packing filter has been running for a period of time and there are too many particles intercepted in the packing and the conditions for continued separation are not met, the packing backwash device is started to clean the particles intercepted on the packing filter through a combination of air and water, so that the packing filter is clean and can be reused.

[0042] Working principle and features:

[0043] When the utility model device is used, hydrogen peroxide, pure oxygen, ozone or / and hydroxyl radicals (O3, O, H2O2, OH) are used as oxidants to pre-treat the wastewater that needs to be evaporated and desalted, and the organic pollutants in the wastewater are deeply oxidized so that the organic pollutants are quickly and thoroughly degraded into substances that are harmless to the environment. During the operation of the treatment device, various oxidants can be combined and a variety of mixed means can be used to quickly and effectively oxidize the organic pollutants in the wastewater, with strong adaptability, fast processing speed, and greatly reduced floor space.

[0044] When using the device of the utility model, hydrogen peroxide, pure oxygen, ozone or / and hydroxyl radicals are used as the main oxidants. We all know that the higher the oxidation potential of the oxidant, the stronger its oxidation performance. Table 1 lists the oxidation potentials of some oxidants, arranged in order from high to low. The higher the oxidation potential of the oxidant, the stronger its ability to decompose organic matter. The device of the utility model can be used according to the different characteristics of organic pollutants in wastewater, and a single oxidant or a plurality of oxidants can be used to act together to carry out targeted purification treatment of organic pollutants in wastewater, so that the use effect of the device is better than that of other pre-treatment devices, and can reduce the influence of COD index and chromaticity on subsequent treatment devices.

[0045] Table 1 Oxidation potentials of some oxidants

[0046] Oxidants Oxidation potential (v) <![CDATA[Fluorine (F2)]]> 3.06 Hydroxyl radical (·OH) 2.80 Nascent oxygen atom (O) 2.42 <![CDATA[Ozone (O3)]]> 2.07 <![CDATA[Hydrogen peroxide (H2O2)]]> 1.78 <![CDATA[Hydroxyl peroxy radical (·O2H)]]> 1.70 Hypochlorous acid (HClO) 1.49 <![CDATA[Chlorine (Cl2)]]> 1.36

[0047] Therefore, the device of the utility model adopts hydrogen peroxide, pure oxygen, ozone or / and hydroxyl radicals as the main oxidants to very quickly and effectively oxidize and remove various complex organic substances in wastewater.

[0048] When the utility model is used, a combination form is adopted to combine chemical reaction, physical separation and other processes in a set of mechanical structures, and the device is used to effectively adjust the acidity and alkali and temperature of the wastewater, so that the wastewater reaches the best state for reaction with the oxidant, and then the oxidation reaction is carried out after being fully mixed with the oxidant, so that a large amount of organic matter in the wastewater is oxidized into carbon dioxide and water, so as to reduce the COD index of the wastewater, reduce the pungent smell of the wastewater, reduce the chromaticity of the wastewater, etc. The treatment device has strong adaptability, fast processing speed, and efficient floor space, and can be adjusted according to the characteristics of different wastewaters, so that it can meet the pretreatment requirements of various wastewaters.

Claims

1. An organic wastewater pretreatment device, comprising a housing, a mixer, an aerator, a temperature regulator, a skimmer, and a packing filter, characterized in that: The shell is divided into a mixing zone, a reaction zone and a separation zone from left to right; a wastewater inlet, an oxidant inlet and an acid and alkali agent inlet are respectively provided on the shell of the mixing zone, and a mixer is installed in the shell of the mixing zone; an aerator is provided at the lower part of the shell of the reaction zone, and the aerator is connected to an external aeration fan through a pipeline; a skimmer is provided at the upper part of the shell of the reaction zone, and a temperature regulator is installed in the shell of the reaction zone, and the temperature regulator is connected to an external PLC controller; a packing filter is provided in the shell of the separation zone, and a wastewater outlet is provided on the shell of the separation zone.

2. The organic wastewater pretreatment device according to claim 1, characterized in that: The shell is made of carbon steel, stainless steel, carbon steel lined with rubber, PVC or PP.

3. The organic wastewater pretreatment device according to claim 1, characterized in that: The aerator is composed of a plurality of microporous aeration heads which are evenly distributed in the lower part of the shell of the reaction zone.

4. The organic wastewater pretreatment device according to claim 1, characterized in that: The temperature regulator adopts a serpentine tube, and the two ends of the serpentine tube are installed on both sides of the shell of the reaction zone.

5. The organic wastewater pretreatment device according to claim 1, characterized in that: The skimmer is driven by a chain and a motor.

6. The organic wastewater pretreatment device according to claim 1, characterized in that: The filler filter is a filter formed by stacking a variety of fillers.

7. The organic wastewater pretreatment device according to claim 1, characterized in that: A pH meter is also installed in the shell of the mixing zone, and the pH meter is connected to an external PLC controller.

8. The organic wastewater pretreatment device according to claim 1, characterized in that: An oxidant dosage detector is installed in the shell of the reaction zone, and the oxidant dosage detector is connected to an external PLC controller.

9. The organic wastewater pretreatment device according to claim 1, characterized in that: A temperature transmitter is installed in the shell of the reaction zone, and the temperature transmitter is connected to an external PLC controller.

10. The organic wastewater pretreatment device according to claim 4, characterized in that: The serpentine tube is made of a smooth tube, a fin tube or a hollow heat pipe.

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