CN117843075A - Device and method for ozone photocatalysis of high-concentration organic sewage - Google Patents

Abstract

An ozone photocatalysis high concentration organic sewage device comprises an ozone generating system, a catalytic reaction system and a water cooling system; the ozone generating system is connected with the side bottom of the catalytic reaction system, and the water cooling system is connected with the bottom of the catalytic reaction system; the ozone generating system comprises an air pump, an air filter, an ozone machine and an air distribution pipeline; the catalytic reaction system comprises: the device comprises a reaction box, an ultraviolet lamp, a catalyst filling column, a heat preservation layer, a water inlet, a water outlet, an air escape pipe and an ozone tail gas absorber; a method for photocatalyzing high-concentration organic sewage by ozone includes such steps as proportionally mixing photocatalyst with active carbon in a mass ratio of 1:2, loading it in catalyst filler column, pouring high-concentration organic sewage into reactor via water inlet of catalytic reaction system, starting ultraviolet lamp when water temp reaches threshold, starting ozone generating system, and discharging the treated organic sewage from reactor via water outlet of catalytic reaction system. The invention has the advantages of low equipment cost, high efficiency, low energy consumption and no secondary pollution.

Description

A device and method for ozone photocatalysis of high-concentration organic sewage

Technical field:

The invention relates to the technical field of sewage treatment, and in particular to a device and method for ozone photocatalysis of high-concentration organic sewage.

Background technique:

High-concentration organic wastewater contains a large amount of macromolecular organic matter such as carbohydrates, fats, proteins, and cellulose. Its main characteristics are high concentrations of organic pollutants, COD values are generally above 2000 mg/L, and some even reach tens of thousands or even hundreds of thousands of mg/L. The composition is very complex and difficult to degrade. It usually contains toxic substances such as aromatic compounds and heterocyclic compounds. At the same time, it may also be accompanied by sulfides, nitrides, heavy metals, and toxic organic matter, which have adverse effects on the surrounding environment. At present, the methods for treating high-concentration organic wastewater are mainly biochemical treatment, chemical oxidation or membrane separation technology, but these methods require a large amount of equipment investment, high treatment costs, or require a large amount of energy supply, which increases the energy consumption of the treatment process, or has low treatment efficiency.

Summary of the invention:

In view of the above problems, the present invention designs an ozone photocatalytic device and method for high-concentration organic wastewater to achieve the purpose of efficient and simple high-concentration organic wastewater treatment.

An ozone photocatalytic device for treating high-concentration organic sewage, the device comprising an ozone generating system, a catalytic reaction system, and a water cooling system; the ozone generating system is connected to the bottom of the catalytic reaction system, and the water cooling system is connected to the bottom of the catalytic reaction system; wherein the ozone generating system comprises an air pump, an air filter, an ozone generator, and an air distribution pipeline; the air outlet of the ozone generator is connected to the bottom of the catalytic reaction system through the air distribution pipeline, the air distribution pipeline is placed at the bottom of the catalytic reaction system, the air outlet of the air filter is connected to the air inlet of the ozone generator, and the air outlet of the air pump is connected to the air inlet of the air filter; the catalytic reaction system comprises : reaction box, ultraviolet lamp, catalyst filling column, insulation layer, water inlet, water outlet, escape pipe, ozone tail gas absorber; the reaction box is wrapped in the insulation layer, the thickness of each side of the insulation layer is equal, the ultraviolet lamp is vertically fixed inside the box body, the upper end of the ultraviolet lamp is connected to the top of the reaction box body, the catalyst filling column is vertically fixed inside the box body, the upper end of the catalyst filling column is connected to the top of the reaction box body, the water inlet is arranged at the bottom of the reaction box body, the water outlet is arranged at the top of the side of the reaction box body, the escape port is arranged at the top of the reaction box body, and the escape port is communicated with the ozone tail gas absorber; the water cooling system is connected to the water outlet of the catalytic reaction system.

Preferably, the ozone generating system further comprises a gas flow meter and a drying box; the air outlet of the drying box is connected to the air inlet of the ozone generator, the air outlet of the air filter is connected to the air inlet of the drying box, and the gas flow meter is arranged on the pipeline between the drying box and the ozone generator.

Preferably, the catalyst packing column is a stainless steel filter cylinder.

Preferably, the catalytic reaction system comprises two catalyst filling columns, which are distributed on both sides of the ultraviolet lamp.

Preferably, the ozone generating system further comprises a distribution box, and the distribution box is electrically connected to the ozone machine.

Preferably, the device for ozone photocatalysis of high-concentration organic wastewater further comprises a temperature controller, and the temperature controller is electrically connected to the insulation layer.

A method for ozone photocatalysis of high-concentration organic sewage comprises the following steps: uniformly mixing a photocatalyst and activated carbon in a mass ratio of (0.5-1.5):(1-3), loading the mixture into a catalyst packing column, pouring high-concentration organic sewage into a reaction box through a water inlet of a catalytic reaction system, turning on an ultraviolet lamp and starting an ozone generating system when the water temperature reaches a threshold value, and discharging the treated organic sewage out of the reaction box through a water outlet of the catalytic reaction system.

Preferably, the photocatalyst is TiO ₂ , and the mass ratio of the photocatalyst to the activated carbon is 1:2.

Preferably, sodium thiosulfate solution is used to absorb ozone tail gas.

The method designs an ozone photocatalytic device and method for high-concentration organic sewage. The ozone oxidation and photocatalytic composite method are used to efficiently treat high-concentration organic sewage. The sewage dissolved in ozone produces hydroxyl radicals (·OH) under the condition of ultraviolet radiation. Under the photocatalytic action, the oxidation performance is enhanced. For microorganisms in water, free radicals act on the bacterial cell membrane, causing damage to the membrane components, resulting in metabolic obstruction, destruction of lipoproteins and lipopolysaccharides in the membrane, and causing cell lysis and death. Ultraviolet radiation damage to microorganisms (bacteria, viruses, spores and other pathogens) and destruction of nucleic acid function make microorganisms lethal, thereby achieving the purpose of sterilization and disinfection. At the same time, under the action of the photocatalyst, the hydroxyl radical obtains an extremely high oxidation potential (2.8eV), and its oxidation ability is enhanced. In addition to killing red blood cells, it can also degrade DNA, cell membrane residues and polysaccharide compounds, and undergo a rapid chain reaction with most organic pollutants, non-selectively oxidizing harmful substances into _CO2 , _H2O or mineral salts. In the device and method disclosed in the present invention, the unique advantages of ozone oxidation and photocatalytic technology are utilized, the equipment is simple and can be implemented, and it has the advantages of high efficiency, low energy consumption, and no secondary pollution.

Description of the drawings:

FIG1 is a diagram of an ozone photocatalytic device for treating high-concentration organic wastewater provided by the present invention.

In the figure: ozone generating system 2, catalytic reaction system 1, water cooling system 3, insulation layer 11, reaction box 12, catalyst packing column 13, ultraviolet lamp 14, water inlet 15, water outlet 16, gas outlet 17, ozone tail gas absorber 18, temperature controller 19, ozone machine 21, gas distribution pipeline 22, gas flow meter 23, drying box 24, air filter 25, air pump 26, distribution box 27.

Detailed ways:

In order to make the technical solution of the present invention easier to understand, a blood vessel enhancement method based on MLP disclosed in the present invention is now clearly and completely described in combination with specific embodiments.

A device for ozone photocatalysis of high-concentration organic sewage, the device comprising an ozone generating system 2, a catalytic reaction system 1, and a water cooling system 3; the ozone generating system 2 is connected to the bottom of the lateral side of the catalytic reaction system 1, and the water cooling system 3 is connected to the bottom of the catalytic reaction system 1; wherein the ozone generating system 2 comprises an air pump 26, an air filter 25, an ozone machine 21, and an air distribution pipe 22; the air outlet of the ozone machine 21 is connected to the bottom of the lateral side of the catalytic reaction system 1 through the air distribution pipe 22, the air distribution pipe 22 is placed at the bottom of the catalytic reaction system 1, the air outlet of the air filter 25 is connected to the air inlet of the ozone machine 21, and the air outlet of the air pump 26 is connected to the air inlet of the air filter 25; the catalytic reaction system 1 comprises: a reaction box 12, an ultraviolet Lamp 14, catalyst packing column 13, insulation layer 11, water inlet 15, water outlet 16, exhaust pipe, ozone tail gas absorber 18; reaction box 12 is wrapped in insulation layer 11, and the thickness of each side of insulation layer 11 is equal. Ultraviolet lamp 14 is vertically fixed inside the box body, and the upper end of ultraviolet lamp 14 is connected with the top of the inner body of reaction box 12. Catalyst packing column 13 is vertically fixed inside the box body, and the upper end of catalyst packing column 13 is connected with the top of the inner body of reaction box 12. Water inlet 15 is arranged at the bottom of reaction box 12, water outlet 16 is arranged at the top of the side of reaction box 12, exhaust port 17 is arranged at the top of reaction box 12, and exhaust port 17 is communicated with ozone tail gas absorber 18; water cooling system 3 is connected with water outlet 16 of catalytic reaction system 1.

In this embodiment, the ozone generating system 2 also includes a gas flow meter 23 and a drying box 24; the air outlet of the drying box 24 is connected to the air inlet of the ozone machine 21, the air outlet of the air filter 25 is connected to the air inlet of the drying box 24, and the gas flow meter 23 is arranged on the pipeline between the drying box 24 and the ozone machine 21.

In this embodiment, the catalyst packing column 13 is a stainless steel filter cylinder.

In this embodiment, the catalytic reaction system 1 includes two catalyst filling columns 13 distributed on both sides of the ultraviolet lamp 14 .

In this embodiment, the ozone generating system 2 further includes a distribution box 27 , and the distribution box 27 is electrically connected to the ozone generator 21 .

In this embodiment, the device for ozone photocatalysis of high-concentration organic wastewater further includes a temperature controller 19 , and the temperature controller 19 is electrically connected to the thermal insulation layer 11 .

A method for ozone photocatalysis of high-concentration organic sewage comprises the following steps: uniformly mixing a _TiO2 catalyst and activated carbon in a mass ratio of 1:2, loading the mixture into a catalyst packing column 13, pouring high-concentration organic sewage into a reaction box 12 through a water inlet 15 of a catalytic reaction system 1, and when the water temperature reaches a threshold value (set by a technician according to specific use requirements), turning on an ultraviolet lamp 13, starting an ozone generating system 2, and discharging the treated organic sewage from the reaction box 11 through a water outlet 16 of the catalytic reaction system 2, and using a sodium thiosulfate solution to absorb ozone tail gas.

In order to more intuitively demonstrate the benefits of the device and method disclosed in the present invention, this embodiment uses examples to illustrate the device and method provided by the present invention.

In this embodiment, the experimental sewage was taken from the sewage collection pool of Jinling Farm in Lingwu City, Ningxia Hui Autonomous Region. The sample was about 1m ³ and was used as needed during the experiment. The raw water quality is shown in Table 1:

Table 1: Raw water quality index table

Pollution Factor COD _Cr BOD _{5 NH3} -N TN TP pH Water quality index (mg/L) 18000 6900 630 90 18 8.7

The main sources of sewage in dairy farms are cow urine, feces, food residues, milking platform washing wastewater and site washing water, as well as domestic sewage from management staff. The water production is mainly concentrated from 6:00 to 12:00 in the morning and from 14:00 to 16:00 in the afternoon, and the amount of sewage is uneven. The concentration of pollutants is extremely high, with high ammonia nitrogen content, high salt content, high content of biological scum caused by residual food and feces, and the sewage BOD/COD ratio is 38.3.

The oxidation reaction is carried out in a 300mm long, 300mm wide and 400mm high organic glass reaction box 11. The reactor is equipped with a 25W low-pressure ultraviolet lamp 14, which can emit 254nm monochromatic light. The reaction box is insulated with 25°C circulating water. A CH-ZTW ozone machine 21 produced by Guangdong Huanchuang Ozone Technology Co., Ltd. is used. The external oxygen flow rate is 3.3L/min, the ozone output is 10g/h, the ozone concentration is 35-100mg/L, the rated power is 147W, the product size is 360×395×152mm, the power supply requires 220V/50Hz, and the net weight is 7.0kg. Ozone is generated with dry air, the air flow rate is controlled at 5L/min, and the tail gas is absorbed by _{sodium thiosulfate} ( _Na2S2O3 ) solution.

TiO ₂ photocatalyst and activated carbon were mixed evenly in a weight ratio of 1:2, loaded into a catalyst packing column 13 with a diameter of 100 mm, and filled with raw water. The temperature of the reaction box 12 was controlled by circulating water through an insulation layer 11. When the water temperature reached the design value, the ultraviolet lamp 14 (artificial amalgam lamp light source, irradiation dose 500 J/m ² ) was turned on, and the ozone generator 21 was started to start the test. The reaction time for each round of operation was 1 hour. After the test, the raw water was replaced and the next round of test was started.

The inlet and outlet ozone mass concentrations were recorded within 1 hour, and 20 mL of water samples were taken every 10 minutes and filtered with a 0.45 μm filter membrane to determine the CODcr, BOD ₅ , SS, NH ₃ -N, and pH indicators of the water samples. In combination with the climate characteristics of the northern region, for the sake of simplicity, the season, month, etc. are not used as variables, but the water temperature is used as a variable to test the treatment effects under 4°C, 14°C, 24°C, and 30°C. These four ambient temperatures can reflect the characteristics of climate change in the four seasons in the northern region. Table 3 is the average of 4 rounds of test experiments under laboratory conditions.

Table 2: Comparison of ozone photocatalytic integrated process treatment effects at different ambient temperatures

Compared with the treatment effect of single ozone oxidation (Table 3), the overall pollutant removal efficiency is significantly improved by the treatment process using ozone photocatalysis integrated process.

It should be pointed out that for ordinary technicians in this technical field, several improvements, substitutions, modifications and embellishments can be made without departing from the principles and purpose of the present invention. These improvements, substitutions, modifications and embellishments should also be regarded as the scope of protection of the present invention.

Claims (9)

1. An ozone photocatalysis high concentration organic sewage device is characterized in that the device comprises an ozone generating system, a catalytic reaction system and a water cooling system; the ozone generating system is connected with the side bottom of the catalytic reaction system, and the water cooling system is connected with the bottom of the catalytic reaction system; wherein the ozone generating system comprises an air pump, an air filter, an ozone machine and an air distribution pipeline; the air outlet of the air filter is connected with the air inlet of the ozone machine, and the air outlet of the air pump is connected with the air inlet of the air filter; the catalytic reaction system includes: the device comprises a reaction box, an ultraviolet lamp, a catalyst filling column, a heat preservation layer, a water inlet, a water outlet, an air escape pipe and an ozone tail gas absorber; the reaction box is wrapped in the heat preservation layer, the thickness of each side of the heat preservation layer is equal, the ultraviolet lamp is vertically fixed in the box body, the upper end of the ultraviolet lamp is connected with the top end in the box body of the reaction box, the catalyst filler column is vertically fixed in the box body, the upper end of the catalyst filler column is connected with the top end in the box body of the reaction box, the water inlet is arranged at the bottom end of the box body of the reaction box, the water outlet is arranged at the lateral top of the box body of the reaction box, the air escape opening is arranged at the top end of the box body of the reaction box, and the air escape opening is communicated with the ozone tail gas absorber; the water cooling system is connected with the water outlet of the catalytic reaction system.

2. The device for photocatalytic high concentration organic wastewater by ozone as set forth in claim 1, wherein said ozone generating system further comprises a gas flow meter and a drying oven; the air outlet of the drying box is connected with the air inlet of the ozone machine, the air outlet of the air filter is connected with the air inlet of the drying box, and the gas flowmeter is arranged on a pipeline between the drying box and the ozone machine.

3. The apparatus for photocatalytic high concentration organic wastewater by ozone as set forth in claim 1, wherein said catalyst packing column is a stainless steel screen cylinder.

4. An apparatus for photocatalytic high concentration organic wastewater by ozone as claimed in claim 3 wherein said catalytic reaction system comprises two catalyst packing columns disposed on both sides of the ultraviolet lamp.

5. The apparatus for photocatalytic high concentration organic wastewater using ozone as set forth in claim 1, wherein said ozone generating system further comprises a power distribution box, said power distribution box being electrically connected to said ozone generator.

6. The apparatus for photocatalytic ozonation of high concentration organic wastewater according to claim 1, further comprising a temperature controller electrically connected to the thermal insulation layer.

7. A method for photocatalysis of high concentration organic sewage by ozone is characterized in that photocatalyst and active carbon are mixed uniformly according to the mass ratio of (0.5-1.5) to (1-3), the mixture is filled into a catalyst filling column, the high concentration organic sewage is filled into a reaction box through a water inlet of a catalytic reaction system, an ultraviolet lamp is started when the water temperature reaches a threshold value, an ozone generating system is started, and the treated organic sewage is discharged out of the reaction box through a water outlet of the catalytic reaction system.

8. The method for photocatalytic high concentration organic sewage by ozone as set forth in claim 7, wherein said photocatalyst is TiO ₂ The mass ratio of the photocatalyst to the activated carbon is 1:2.

9. The method for photocatalytic high concentration organic wastewater by means of ozone as set forth in claim 7, wherein said ozone tail gas is absorbed by means of sodium thiosulfate solution.