CN103663668A - Chemical oxidation wastewater treatment system utilizing solar heating and treatment method - Google Patents

Abstract

The invention provides a chemical oxidation wastewater treatment system heated by solar energy, which includes No. 1 reaction tank, No. 2 reaction tank, No. 3 reaction tank, heat exchanger and solar collector. Connection, the heat exchanger is connected with the No. 2 reaction tank, the heat exchanger is connected with the No. 3 reaction tank, the solar collector is connected with the No. 2 reaction tank, and the No. 1 reaction tank is connected with a dosing meter with high stability characteristics In system I, the No. 2 reaction tank is connected with the dosing metering system II with high reaction efficiency characteristics, and the No. 3 reaction tank is connected with the dosing metering system III with low residue characteristics. At the same time, the processing method of the system is also provided. The invention can promote the degradation of refractory and refractory biochemical organic pollutants, improve the treatment efficiency of wastewater, and realize a multiple advanced oxidation treatment process with high efficiency, less residue, short time, low energy consumption and no secondary pollution.

Description

Chemical oxidation wastewater treatment system and treatment method using solar heating

technical field

The invention relates to the technical field of industrial wastewater treatment devices, in particular to a chemical oxidation wastewater treatment system and treatment method using solar heating.

Background technique

With the development and expansion of modern industrial production scale, a large number of harmful substances produced in the production process have increasingly polluted the natural environment, and the harm to human health has become increasingly common and serious. Among them, wastewater containing a large amount of refractory organic pollutants is the difficulty and focus of scientific research in environmental governance. For example, wastewater discharged from industries such as chemical industry, printing and dyeing, pharmaceuticals, and pesticides often contains a large amount of chlorinated benzenes, nitrobenzenes, phenols, polycyclic aromatic hydrocarbons, pesticides, and other priority pollutants. This type of wastewater has a complex structure, Toxic, harmful, high concentration, poor biodegradability and high treatment cost, seriously pollute the water environment and endanger human health.

At present, for the treatment of high-concentration refractory organic wastewater, physical and chemical methods, chemical methods, biochemical methods and their combinations are often used. However, due to the special properties of this type of wastewater, the requirements for conventional treatment technologies are generally high, and it is difficult to achieve Satisfactory processing effect. Therefore, the research on the treatment of refractory industrial organic wastewater has always been a difficulty and research hotspot in domestic and foreign water treatment work.

Advanced oxidation technology is an advanced water treatment technology that degrades organic pollutants through strong active free radicals (such as OH, etc.). It can cause refractory organic pollutants to undergo reactions such as ring opening, bond breaking, addition, substitution, and electron transfer. It is non-selective and can transform large molecular refractory organics into small molecules that are easy to degrade, and can even be directly oxidized into CO ₂ , H ₂ O and inorganic salts to achieve the purpose of harmless treatment. This treatment technology has a good degradation effect on industrial wastewater with high concentration, high toxicity and poor biodegradability.

Chinese patent CN201110329576.9 discloses an advanced treatment system and method for refractory biodegradable organic wastewater. The device is completed by connecting six independent reaction pools. In this method, the pH of the waste water is adjusted, and the advanced oxidation reaction is carried out after precipitation and filtration, and the final effluent is discharged through the effluent pH adjustment system again. Among them, the PH value of the influent water is 10.0-11.0, and the PH value of the effluent water is 7.00-7.50. The advanced oxidation reaction is completed under the synergistic effect of ozone and ultraviolet light. The ozone passes through the tree pond of the aeration system, and the dosage of ozone is 500-1000ml/L , The dosage of the ultraviolet lamp is at least 675W·S/cm2, and the ultraviolet wavelength emitted by the ultraviolet lamp is 254cm. The method effectively improves the treatment effect of the refractory biodegradable organic wastewater, the system is easy to control, the long-term operation is stable, and no secondary pollution is generated. However, the treatment device needs to adjust the pH of the water when it enters and exits the water. The dosing system is too complicated, and the light intensity of the ultraviolet lamp will be weakened during use, which will affect the treatment effect. There are many reaction pools and the device occupies a large area. Big running costs.

Chinese patent CN201220190379.3 discloses an advanced oxidation treatment device for refractory organic wastewater. The device uses a Fenton oxidation tower as the main device of the advanced oxidation treatment device. H ₂ O ₂ and FeSO ₄ are adjusted to The raw water of 2 to 4 is mixed and enters the bottom of the oxidation tower, and then the water is uniformly distributed by the water distribution system and then enters the fluidized bed reaction zone. Back to the fluidized bed reaction zone, the waste water flows out through the outlet weir. The method has a good mixing effect between the medicament and the waste water, and at the same time saves the power device of the dosing system, and the COD concentration of the effluent is stably below 50 mg/L. However, since the reaction is carried out in the fluidized bed reaction zone, the slow flow rate will lead to incomplete mixing of the catalyst and wastewater, resulting in low treatment effect, and the fast flow rate will lead to poor reaction and poor treatment effect. good. Furthermore, the quartz sand carrier material is likely to cause equipment wear and affect the service life of the equipment.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a chemical oxidation wastewater treatment system and treatment method using solar heating.

The present invention is achieved through the following technical solutions:

According to one aspect of the present invention, a chemical oxidation wastewater treatment system using solar heating is provided, including No. 1 reaction tank, No. 2 reaction tank, No. 3 reaction tank, heat exchanger and solar heat collector, wherein the The water outlet of the No. 1 reaction tank is connected with the first water inlet of the heat exchanger, the first water outlet of the heat exchanger is connected with the water inlet of the No. 2 reaction tank, and the water outlet of the No. 2 reaction tank is connected with the water inlet of the No. 2 reaction tank. The second water inlet of the heat exchanger is connected, the second water outlet of the heat exchanger is connected with the water inlet of the No. 3 reaction tank, the solar collector is connected with the No. 2 reaction tank, and the No. 1 reaction tank is connected. The reaction tank is connected with the dosing metering system I with high stability characteristics, the No. 2 reaction tank is connected with the dosing metering system II with high reaction efficiency characteristics, and the No. 3 reaction tank is connected with the dosing system II with low residue characteristics Metering System III.

Preferably, the water inlet of the No. 1 reaction tank is provided with an inlet pump; the water outlet of the No. 3 reaction tank is provided with an outlet pump; further, the water inlet of the No. 1 reaction tank is connected with external industrial wastewater, The water outlet of the No. 3 reaction tank is connected with the water outlet pipe.

Preferably, any one or more of the No. 1 reaction tank, No. 2 reaction tank, and No. 3 reaction tank is provided with an aeration system.

Preferably, the dosing metering system III includes an ozone generator and an ozone collector.

Preferably, the No. 1 reaction tank, No. 2 reaction tank and No. 3 reaction tank are made of glass, ceramics, enamel, high-temperature engineering plastics or graphite.

Preferably, the tank volume of the No. 2 reaction tank: the surface area of the solar collector is between 1m ³ : 3m ² and 1m ³ : 5m ² ; any one of the reaction tanks (No. No. 3 reaction tank) tank volume: heat exchanger surface area: between 1m ³ : 0.5m ² and 1m ³ : 1.5m ² .

According to another aspect of the present invention, there is provided a treatment method for the above-mentioned chemical oxidation wastewater treatment system utilizing solar heating, comprising the following steps:

Step 1, under normal pressure, introduce organic industrial wastewater that is difficult to biodegrade into No. 1 reaction tank, and add an oxidant with high stability characteristics through the dosing metering system I to perform preliminary low-temperature oxidation treatment;

Step 2, introducing the primary treated waste water obtained in step 1 into a heat exchanger, and performing preliminary preheating and temperature regulation by the heat exchanger;

Step 3, connect the wastewater in step 2 to No. 2 reaction tank, which is connected to a solar collector, and within a certain temperature range, add an oxidant with high reaction efficiency through the dosing metering system II for high-temperature oxidation reaction;

Step 4, the waste water after the reaction in step 3 is cooled down again through the heat exchanger, and then enters the No. The water outlet of No. 3 reaction tank is discharged.

Preferably, the oxidant added in the low-temperature oxidation treatment stage is chlorine dioxide or hydrogen peroxide; the oxidant added in the high-temperature oxidation reaction stage is hydrogen peroxide or potassium permanganate; the oxidant added in the advanced oxidation reaction stage is ozone.

Preferably, the solar heat collector keeps the reaction temperature of the No. 2 reaction tank at a temperature range of 40-99°C.

Preferably, the above-mentioned treatment method is required to be carried out under acid-resistant and oxidation-resistant conditions, and has a good heat preservation effect. Therefore, the three reaction tanks (No. 1, No. 2, and No. 3) generally use glass, ceramics, enamel, High-temperature engineering plastics, graphite and other materials to achieve good response and long-lasting working time.

With the continuous entry of wastewater, the three dosing metering systems (I, II, III) can continuously add chemical oxidants and catalysts according to the amount of wastewater, and use the aeration system for hydraulic stirring to achieve the purpose of full reaction. At the same time, multiple chemical oxidations occur in different stages as the wastewater flows. Thus, the device can continuously treat industrial organic wastewater.

The present invention connects No. 1 reaction tank, heat exchanger, No. 2 reaction tank, heat exchanger, and No. 3 reaction tank to form a multiple chemical oxidation treatment system for refractory biochemically degradable organic wastewater, which effectively improves the resistance to biochemically degradable organic wastewater. The treatment effect of organic wastewater; the use of solar energy as a heat source, the use of heat exchangers for circular heat exchange, further reducing energy consumption; simple operation, thorough reaction, and economic and technological feasibility.

The invention has the characteristics of fast reaction speed and good treatment effect, uses solar energy as a heating source, and adjusts the temperature of sewage before and after treatment through a heat exchanger, thereby achieving the effect of saving energy while efficiently completing the treatment of difficult-to-biochemical industrial wastewater.

The invention combines the multiple chemical oxidation process of wastewater with the heating process of solar heating to promote the degradation of refractory biochemical organic pollutants and improve the treatment efficiency of wastewater, thereby achieving high efficiency, less residue, short time, low energy consumption, and no pollution. Multiple advanced oxidation treatment process for secondary pollution.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a structural block diagram of the chemical oxidation wastewater treatment system utilizing solar energy heating in the present invention.

Detailed ways

The following is a detailed description of the embodiments of the present invention: this embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Example

As shown in Figure 1, this embodiment provides a chemical oxidation wastewater treatment system utilizing solar energy heating, including No. 1 reaction tank, No. 2 reaction tank, No. 3 reaction tank, heat exchanger and solar heat collector, wherein, The water outlet of the No. 1 reaction tank is connected with the first water inlet of the heat exchanger, the first water outlet of the heat exchanger is connected with the water inlet of the No. 2 reaction tank, and the outlet of the No. 2 reaction tank The water port is connected to the second water inlet of the heat exchanger, the second water outlet of the heat exchanger is connected to the water inlet of the No. 3 reaction tank, and the solar heat collector is connected to the No. 2 reaction tank. The No. 1 reaction tank is connected with the dosing metering system I with high stability characteristics, the No. 2 reaction tank is connected with the dosing metering system II with high reaction efficiency characteristics, and the No. 3 reaction tank is connected with the dosing metering system II with low residue characteristics. Dosing metering system III.

Further, the water inlet of the No. 1 reaction tank is provided with an inlet pump; the water outlet of the No. 3 reaction tank is provided with an outlet pump; further, the water inlet of the No. 1 reaction tank is connected with external industrial wastewater, The water outlet of the No. 3 reaction tank is connected with the water outlet pipe.

Further, any one or more of the No. 1 reaction tank, No. 2 reaction tank, and No. 3 reaction tank is equipped with an aeration system.

Further, the dosing metering system III includes an ozone generator and an ozone collector.

Further, the No. 1 reaction tank, No. 2 reaction tank and No. 3 reaction tank are made of glass, ceramics, enamel, high-temperature engineering plastics or graphite.

Further, the tank volume of the No. 2 reaction tank: the surface area of the solar collector is: 1m ³ : 3m ² ~ 1m ³ : 5m ² ; any reaction tank (No. 1 reaction tank, No. 2 reaction tank or No. 3 reaction tank) tank volume: heat exchanger surface area: between 1m ³ : 0.5m ² and 1m ³ : 1.5m ² .

The chemical oxidation wastewater treatment system utilizing solar energy heating provided in this embodiment, its treatment method comprises the following steps:

Step 1, under normal pressure, introduce organic industrial wastewater that is difficult to biodegrade into No. 1 reaction tank, and add an oxidant with high stability characteristics through the dosing metering system I to perform preliminary low-temperature oxidation treatment;

Step 2, introducing the primary treated waste water obtained in step 1 into a heat exchanger, and performing preliminary preheating and temperature regulation by the heat exchanger;

Step 3, connect the wastewater in step 2 to No. 2 reaction tank, which is connected to a solar collector, and within a certain temperature range, add an oxidant with high reaction efficiency through the dosing metering system II for high-temperature oxidation reaction;

Step 4, the waste water after the reaction in step 3 is cooled down through the heat exchanger again, and then enters the No. The water outlet of No. 3 reaction tank is discharged.

Further, the oxidant added in the low-temperature oxidation treatment stage is chlorine dioxide or hydrogen peroxide; the oxidant added in the high-temperature oxidation reaction stage is hydrogen peroxide or potassium permanganate; the oxidant added in the advanced oxidation reaction stage is ozone.

Further, the solar heat collector keeps the reaction temperature of the No. 2 reaction tank at a temperature range of ^40-99 °C.

Further, the above-mentioned treatment method is required to be carried out under acid-resistant and oxidation-resistant conditions, and has a good heat preservation effect. Therefore, the three reaction tanks (No. 1, No. 2, and No. 3) generally use glass, ceramics, enamel, High-temperature engineering plastics, graphite and other materials to achieve good response and long-lasting working time.

This embodiment is specifically:

The following specific example illustrates that the TOC content of industrial wastewater to be treated is 493.65 mg/L. The following description is only for those skilled in the art to better understand the present invention, and is not intended to limit the present invention.

Example 1

The industrial wastewater to be treated is introduced into the No. 1 reaction tank through the water inlet pump, H ₂ O ₂ is used as the oxidant, and FeSO ₄ is used as the catalyst. The dosing metering system I is added to the No. 1 reaction tank and mixed with the wastewater to perform the first reaction. The molar ratio of ₂ O ₂ and FeSO ₄ is 3:2; after 1 hour of reaction, the waste water is introduced into the heat exchanger, and the heat exchanger performs preliminary preheating and temperature adjustment; the waste water then enters the No. 2 reaction tank, which is connected with In the solar collector, chlorine dioxide is added to carry out high-temperature oxidation reaction for 1 hour; after the reaction, the water is cooled through the heat exchanger again, and the waste water enters the No. 3 reaction tank, and the waste water is subjected to advanced oxidation reaction through ozone for 1 hour. Turn on the outlet pump to discharge the treated water through the outlet pipe.

Each of the above three reaction tanks (No. 1, No. 2, and No. 3) has an aeration system for hydraulic stirring;

The above-mentioned No. 3 reaction tank is connected with an ozone generator and an ozone tail gas collection device;

The ratio parameters of the volume of each of the above-mentioned reaction tanks (No. 1, No. 2, and No. 3), the surface area of the solar collector and the surface area of the heat exchanger are 1m ³ : 3m ² : 0.5m ² .

It was measured that the TOC content of the treated water was 275.65mg/L, and the removal rate was 44.2%.

Example 2

The industrial wastewater to be treated is introduced into the No. 1 reaction tank through the water inlet pump, H ₂ O ₂ is used as the oxidant, and FeSO ₄ is used as the catalyst. The dosing metering pump I is added to the No. 1 reaction tank and mixed with the wastewater to perform the first reaction. The molar ratio of ₂ O ₂ and FeSO ₄ is 3:2; after 1 hour of reaction, the waste water is introduced into the heat exchanger, and the heat exchanger performs preliminary preheating and temperature adjustment; the waste water then enters the No. 2 reaction tank, which is connected with In the solar collector, chlorine dioxide is added to carry out high-temperature oxidation reaction for 1 hour; after the reaction, the water is cooled through the heat exchanger again, and the waste water enters the No. 3 reaction tank, and the waste water is subjected to advanced oxidation reaction through ozone for 1 hour. Turn on the outlet pump to discharge the treated water through the outlet pipe.

Each of the above three reaction tanks (No. 1, No. 2, and No. 3) has an aeration system for hydraulic stirring;

The above-mentioned No. 3 reaction tank is connected with an ozone generator and an ozone tail gas collection device;

The ratio parameters of the volume of each of the above-mentioned reaction tanks (No. 1, No. 2, and No. 3), the surface area of the solar collector and the surface area of the heat exchanger are 1m ³ : 3.5m ² : 1.0m ² .

It was measured that the TOC content of the treated water was 224.95mg/L, and the removal rate was 54.4%.

Example 3

The industrial wastewater to be treated is introduced into the No. 1 reaction tank through the water inlet pump, H ₂ O ₂ is used as the oxidant, and FeSO ₄ is used as the catalyst. The dosing metering system I is added to the No. 1 reaction tank and mixed with the wastewater to perform the first reaction. The molar ratio of ₂ O ₂ and FeSO ₄ is 3:2; after 1 hour of reaction, the waste water is introduced into the heat exchanger, and the heat exchanger performs preliminary preheating and temperature adjustment; the waste water then enters the No. 2 reaction tank, which is connected with In the solar collector, chlorine dioxide is added to carry out high-temperature oxidation reaction for 1 hour; after the reaction, the water is cooled through the heat exchanger again, and the waste water enters the No. 3 reaction tank, and the waste water is subjected to advanced oxidation reaction through ozone for 1 hour. Turn on the outlet pump to discharge the treated water through the outlet pipe.

Each of the above three reaction tanks (No. 1, No. 2, and No. 3) has an aeration system for hydraulic stirring;

The above-mentioned No. 3 reaction tank is connected with an ozone generator and an ozone tail gas collection device;

The ratio parameters of the volume of each of the above-mentioned reaction tanks (No. 1, No. 2, and No. 3), the surface area of the solar collector and the surface area of the heat exchanger are 1m ³ : 4m ² : 1.0m ² .

It was measured that the TOC content of the treated water was 174.95mg/L, and the removal rate was 66.2%.

In the above method, the chemical oxidation wastewater treatment system heated by solar energy removes the refractory biodegradable organic matter in industrial wastewater, meets the treatment requirements of related wastewater, and is easy to operate, fast in processing speed, flexible in processing mode, and low in energy consumption.

In this method, the length of the reaction time will affect the treatment effect, so in the actual production operation, the more thorough treatment effect can be achieved by increasing the reaction time.

The chemical oxidation wastewater treatment system and treatment method using solar heating provided in this embodiment has a remarkable treatment effect on organic matter and is technically and economically feasible.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims (9)

1. a chemical oxidation Waste Water Treatment that utilizes solar heating, it is characterized in that, comprise reactive tank No. one, No. two reactive tanks, No. three reactive tanks, interchanger and solar energy collector, wherein, the water outlet of a described reactive tank is connected with the first water-in of interchanger, the first water outlet of described interchanger is connected with the water-in of No. two reactive tanks, the water outlet of described No. two reactive tanks is connected with the second water-in of interchanger, the second water outlet of described interchanger is connected with the water-in of No. three reactive tanks, described solar energy collector is connected with No. two reactive tanks, a described reactive tank is connected with the dosing metering system I with high stable characteristic, described No. two reactive tanks are connected with the dosing metering system II with high reaction efficiency characteristic, described No. three reactive tanks are connected with the dosing metering system III with low residue characteristic.

2. the chemical oxidation Waste Water Treatment that utilizes solar heating according to claim 1, is characterized in that, the water-in of a described reactive tank is provided with intake pump; The water outlet of described No. three reactive tanks is provided with out water pump.

3. the chemical oxidation Waste Water Treatment that utilizes solar heating according to claim 1, is characterized in that, any in a described reactive tank, No. two reactive tanks, No. three reactive tanks or a plurality of aerating systems that are provided with.

4. the chemical oxidation Waste Water Treatment that utilizes solar heating according to claim 1, is characterized in that, described dosing metering system III comprises ozonizer and ozone collector.

5. the chemical oxidation Waste Water Treatment that utilizes solar heating according to claim 1, is characterized in that, a described reactive tank, No. two reactive tanks and No. three reactive tanks adopt glass, pottery, enamel, high-temperature engineering plastics or graphite material.

6. according to the chemical oxidation Waste Water Treatment that utilizes solar heating described in any one in claim 1 to 5, it is characterized in that the cell body volume of described No. two reactive tanks: solar energy collector surface-area is: 1m ³: 3m ²～1m ³: 5m ²; The cell body volume of any reactive tank: heat exchanger surface amasss and is: 1m ³: 0.5m ²～1m ³: 1.5m ².

7. a treatment process of utilizing the chemical oxidation Waste Water Treatment of solar heating, is characterized in that, comprises the following steps:

Step 1, under normal pressure, introduces a reactive tank by the organic industrial sewage that is difficult to biochemical degradation, by dosing metering system I, adds the oxygenant with high stable characteristic to carry out preliminary low-temperature oxidation processing;

Step 2, introduces interchanger by the waste water of the first processing obtaining in step 1, by interchanger, carries out preliminary preheating and temperature regulates;

Step 3, by No. two reactive tanks of waste water access in step 2, No. two reactive tank is connected with solar energy collector, in certain temperature range, by dosing metering system II, adds the oxygenant with high reaction efficiency to carry out high temperature oxidation reaction;

Step 4, the reacted waste water of step 3, again through the interchanger processing of lowering the temperature, is then entered to reactive tank No. three, by dosing metering system III, add the oxygenant with low residue to carry out advanced oxidation reaction to waste water, after reaction finishes, by the water outlet of No. three reactive tanks, discharge.

8. the treatment process of utilizing the chemical oxidation Waste Water Treatment of solar heating according to claim 7, is characterized in that, the oxygenant adding the treatment stage of low-temperature oxidation is dioxide peroxide or hydrogen peroxide; The oxygenant adding in high temperature oxidation step of reaction is hydrogen peroxide or potassium permanganate; The oxygenant adding in advanced oxidation step of reaction is ozone.

9. according to the treatment process of the chemical oxidation Waste Water Treatment that utilizes solar heating described in claim 7 or 8, it is characterized in that, described solar energy collector makes the temperature of reaction of No. two reactive tanks remain on the temperature range of 40～99 ℃.

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