CN101284689A - A kind of water treatment reactor and method thereof integrating photocatalysis and biodegradation - Google Patents

Abstract

The invention relates to a water treatment reactor integrating photocatalysis and biodegradation and a treatment method thereof. A water treatment reactor integrating photocatalysis and biodegradation, the photocatalytic plate (3) is used as a partition between the photocatalytic zone (2) located at the upper part of the reactor and the biodegradation zone (10) located at the lower part , and the photocatalytic plate is provided with an upper water hole (1) and a lower water hole (5); the ultraviolet light source (4) is controlled by a switch and is located above the photocatalytic plate (3); the biofilm carrier (8) is located in the biodegradation area (10 ); the lower edge wall of the photocatalytic zone (2), the top of the photocatalytic plate (3) offers a water outlet (6) and a valve, and the lower edge wall of the biodegradation zone (10) offers a water inlet (7) and valve; the reactor (9) is provided with a water circulation device, and the microorganisms in the biological reaction zone are shielded by the photocatalytic plate to avoid the killing effect of ultraviolet light on it, and the refractory organic matter is greatly improved under the joint action of the photocatalyst and the biofilm The rate of water treatment, the reactor has the characteristics of compact structure, high efficiency and rapidity.

Description

A kind of water treatment reactor and method thereof integrating photocatalysis and biodegradation

(1) Technical field

The invention relates to a water treatment technology, including a reactor and a method thereof, in particular to a water treatment reactor integrating photocatalysis and biodegradation and a treatment method thereof.

(2) Background technology

The technology belongs to a device and a method for environmental engineering, biochemical reaction engineering, environmental biotechnology, chemical reaction engineering and water treatment. With the continuous development of industrial and agricultural production and the continuous improvement of people's living standards, many natural rivers, lakes, landscape waters and other surface waters, and even drinking water sources have been polluted, and most of them have more or less formed eutrophication. Coupled with the random discharge of some industrial wastewater, many water bodies also contain a large amount of refractory organic pollutants, forming complex pollution. These pollutions lead to the destruction of many functions of natural water bodies such as rivers, lakes and landscape waters, especially the pollution of drinking water sources, which has a greater impact on people's normal production and life. Therefore, it is imminent to treat and restore refractory industrial wastewater or compound polluted natural water bodies.

At present, in the restoration of natural water bodies, aquatic plants are mostly used for restoration at home and abroad. Aquatic plants are characterized by saving energy in the restoration of polluted water bodies. However, this method has low efficiency and long restoration period, especially for the restoration of complex polluted water bodies. In some rivers or waters, it is not convenient to use due to the needs of shipping. For the treatment of refractory industrial organic wastewater, the efficiency of biological treatment alone is relatively low, and some organic pollutants can also inhibit microorganisms.

Therefore, for the treatment of this type of water body, some people use photocatalytic degradation first, and then use biological methods for subsequent treatment. Mineralize these organic compounds and transform them into non-toxic substances. This is because some organic compounds are transformed into easily biodegradable products after photocatalytic degradation. At present, the two technologies are usually properly combined at home and abroad, that is, photocatalytic oxidation and biodegradation are carried out in two units in one process, so photocatalytic combined with biological treatment is an advanced treatment of some refractory organic substances. A proven method.

But the question here is, to what extent is the refractory organic wastewater degraded by photocatalysis before biodegradation? If photocatalysis is used to degrade refractory organic wastewater for a long time, the efficiency is low, and the organic matter cannot be completely mineralized, or the cost is very high, which is economically unfeasible. However, the photocatalytic degradation time is not enough, and it often has an inhibitory effect on microorganisms or from the perspective of biodegradation, its reaction rate is very slow. So is it possible to consider combining photocatalysts with biofilms, that is, to combine photocatalysis and biodegradation? This method is used to combine photocatalysis and biofilm for some refractory organic compounds to degrade organic matter. But here another problem arises, that is, in general, when _TiO2 is used as a photocatalyst for photocatalytic treatment of organic wastewater, it is necessary to use strong ultraviolet light irradiation, due to the killing effect of ultraviolet light and free radicals on microbial cells, So in the past, photocatalysis and biological treatment were carried out separately. On the one hand, this causes the processing process to be complicated, and on the other hand, it also increases the processing cost and reduces the efficiency.

(3) Contents of the invention

The purpose of the present invention is to provide a method to overcome the above-mentioned deficiencies in the existing photocatalysis and biodegradation technology, provide a new type of integrated water treatment method and corresponding reactor, and realize efficient, fast and convenient repair of complex pollution Water bodies and treatment of industrial wastewater containing refractory organic matter.

The purpose of the present invention is achieved by the following structure.

A water treatment reactor integrating photocatalysis and biodegradation, characterized in that: a photocatalytic plate 3 is used as a partition between the photocatalytic zone 2 on the upper part of the reactor and the biodegradation zone 10 on the lower part , and the photocatalytic plate is provided with an upper water hole 1 and a lower water hole 5;

The ultraviolet light source 4 is controlled by a switch and located above the photocatalytic plate 3;

The biofilm carrier 8 is located in the biodegradation zone 10;

On the lower edge wall of the photocatalytic zone 2, a water outlet 6 and a valve are set above the photocatalytic plate 3, and a water inlet 7 and a valve are set on the lower edge wall of the biodegradation zone 10;

A water circulation device is provided on the reactor 9 .

Further, the water circulation device is a water pump 11 , the water pump 11 is connected to the biodegradation area 10 at its water outlet, and its water outlet is connected to the photocatalytic area 2 .

Further, the water body circulation device is an air pump 12, and the exhaust port of the air pump 12 leads to the lower part of the biodegradation zone 10.

Further, the photocatalytic zone 2 is open at the top.

Further, the photocatalytic area 2 is covered by a quartz glass plate.

Further, the upper water hole 1 and the lower water hole 5 on the photocatalytic plate are respectively located at two ends of the reactor 9 in the lengthwise direction.

Further, the biodegradation zone 10 is equipped with a biofilm carrier of ceramic material in the form of baffle or advection water flow.

A photocatalytic and biodegradable water treatment method, characterized in that:

① Hanging film of biofilm without ultraviolet irradiation;

②After successful film formation, the water undergoes photocatalytic degradation and biodegradation treatment repeatedly in the circulating flow, and the biodegradation process does not have ultraviolet light irradiation.

Further, the biofilm-hanging method is as follows: when treating wastewater or industrial wastewater containing refractory organic matter, immerse the activated sludge or the special microbial strain solution cultivated for refractory organic pollutants into the biofilm carrier, and the water cycle Flowing, film-hanging time 1-3 days.

Further, the biofilm formation method is to naturally generate the biofilm during the continuous film formation process when treating slightly polluted water bodies or drinking water source water, and the film formation time is 7 to 14 days.

With this technical solution, the water to be treated is continuously input into the reactor through the water pump to realize continuous water treatment. In addition, the water is circulated in the reactor through the circulating water pump or the air pump. When the water flows through the surface of the photocatalytic plate, it will Under the radiation, the water body mainly undergoes photocatalytic reaction and gets a certain degree of degradation. When the water body flows through the lower part of the reactor, the water body contacts the surface of the biofilm and mainly undergoes biological reactions. According to the transparency of the water to be treated, the height of the water outlet of the reactor is controlled by adjusting the water outlet and the valve to control the thickness of the water layer on the surface of the photocatalytic plate and increase the transmittance of ultraviolet light, thereby improving the efficiency of photocatalysis.

The biological reaction zone is a baffle type, and it can also adopt an advection type or form various flow forms according to the shape of other biofilm carriers.

The photocatalytic plate acts as a shading plate to block the irradiation of ultraviolet light on the biodegradation area, and avoids the killing effect of ultraviolet light on microbial cells.

The upper part of the photocatalytic area is open or covered by a quartz glass plate, so that the structure can ensure that the ultraviolet light is directly and fully irradiated on the photocatalytic plate for photocatalytic degradation treatment.

Ceramic material is a relatively ideal biofilm carrier, and the effect of hanging film is better. It is also a better form of water flow to use baffle or advection in the biodegradation zone.

The upper water hole and the lower water hole on the photocatalytic plate are respectively located at the two ends of the length direction of the photocatalytic zone, so that the water body in the reactor can be fully circulated and the treatment effect is better.

In the start-up stage of the reactor, the biofilm is first hung. At this time, the switch of the ultraviolet light source is turned off, and different methods of hanging the film are adopted according to different processing objects. For industrial wastewater containing refractory organic pollutants, the domesticated activated sludge or the microbial bacterial solution cultivated for refractory organic pollutants can be submerged in the biofilm carrier, and driven by a circulating pump without ultraviolet radiation, let it Circulating flow in the reactor, the film hanging time is 1-3 days. For slightly polluted source water, the method of natural film formation can be adopted, so that the source water to be treated can circulate in the reactor, and the film formation time is 7-14 days.

Advantages and beneficial effects of the present invention: the present invention provides a reactor integrating photocatalysis and biodegradation. The reactor is divided into a photocatalytic reaction area and a biological reaction area by using a plate loaded with photocatalyst. The upper part of the photocatalytic zone is an ultraviolet light source. Due to the effect of the photocatalytic plate, the microorganisms in the biological reaction area can avoid the killing effect of ultraviolet light on them. In this way, under the joint action of photocatalyst and biofilm, the rate of water treatment can be greatly improved, especially the treatment efficiency of water containing refractory organic pollutants. The reactor has the characteristics of compact device structure and efficient and fast water treatment, which completely changes the structure of the split reactor in the existing technology at home and abroad. Wastewater treatment is of great significance.

The method of the present invention can be used for the restoration of polluted surface water, the treatment of drinking water source water, the pretreatment of the effluent of urban sewage treatment plants as reclaimed water, etc., and the reactor and treatment method can also be extended and applied to related refractory Organic industrial wastewater treatment and other fields.

(4) Description of drawings

Figure 1 is a schematic diagram of a photocatalytic and biodegradation integrated reactor using a pump as a water circulation device

Figure 2 is a schematic diagram of a photocatalytic and biodegradation integrated reactor using an air pump as a water circulation device

In the figure, 1 is the upper water hole, 2 is the photocatalytic area, 3 is the photocatalytic plate, 4 is the ultraviolet light source, 5 is the water hole, 6 is the water outlet, 7 is the water inlet, 8 is the biofilm carrier, and 9 is the reaction device, 10 is a biodegradation zone, 11 is a water pump, and 12 is an air pump.

(5) Specific implementation methods

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

For a reactor integrating photocatalysis and biodegradation, the operating steps are as follows when treating industrial wastewater containing refractory organic pollutants, performing surface water restoration, and treating drinking water source water:

The treatment of embodiment one refractory organic waste water

The surface of the ceramic material is coated with TiO ₂ , and the fabricated photocatalytic plate 3 is placed horizontally in the reactor 9 , and the reactor 9 is divided into an upper photocatalytic zone 2 and a lower biodegradation zone 10 .

Add the domesticated activated sludge solution or the special microbial bacterial solution cultivated for refractory organic wastewater into the reactor 9 and submerge the biofilm carrier 8, and circulate in the reactor 9, turn off the ultraviolet light source 4, and inoculate it through adsorption After 2-3 days, a mature biofilm is formed, and excess activated sludge or bacterial liquid is discharged.

After the biofilm is formed, continuous treatment is carried out, and another water pump is used to control the flow rate, and the water to be treated is pumped into the reactor to realize continuous treatment. The upper part of the reactor 9, and the water pipe pressed into the upper part extends into the reactor to reach the position above the photocatalytic plate 3, so that the water to be treated flows horizontally through the photocatalytic plate, and then enters the biological reaction zone through the lower water hole 5, so Reciprocating circulation in the reactor 9, while turning on the ultraviolet light 4.

The surface water remediation of embodiment two composite pollution

TiO ₂ is coated on the surface of ceramic or glass material, and the photocatalytic plate 3 made is placed on the upper part of the reactor 9 , and the reactor 9 is divided into a photocatalytic zone 2 and a biodegradation zone 10 . According to the method described in Example 1, the film-hanging and operation are carried out. After the film-hanging is successful, the complex polluted surface water is continuously pumped in for continuous treatment, and the water to be treated is continuously circulated through the photocatalysis under the action of the circulating water pump 11 or the air pump 12. Zone and biological reaction zone, when passing through the photocatalytic zone 2, the water body is under the action of photocatalysis, and the refractory organic pollutants are partially degraded into organic carbon sources that can be effectively used by microorganisms, which promotes the smooth denitrification and phosphorus removal of complex polluted water bodies In order to realize the simultaneous removal of nitrogen, phosphorus and other elements and refractory organic pollutants.

The treatment of embodiment three source water

TiO ₂ is coated on the surface of ceramic or glass material, and the photocatalytic plate 3 made is placed on the upper part of the reactor 9 , and the reactor 9 is divided into a photocatalytic zone 2 and a biodegradation zone 10 . Continuously pump the source water to be treated into the reactor 9, turn off the ultraviolet light source 4, and circulate the water in the reactor 9 through the circulating water pump 11 or the air pump 12 under the condition of no ultraviolet irradiation. After 7-14 days, let it naturally form a biofilm on the biofilm carrier 8. After the film is successfully formed, turn on the ultraviolet light source 4 to continuously perform advanced treatment on the source water to remove trace organic pollutants in the water body.

Claims (10)

1. A water treatment reactor integrating photocatalysis and biodegradation, characterized in that: the photocatalysis zone (2) positioned at the top of the reactor and the biodegradation zone ( 10) the separation plate between them, and the photocatalytic plate is provided with an upper water hole (1) and a lower water hole (5); The ultraviolet light source (4) is controlled by a switch and located above the photocatalytic plate (3); The biofilm carrier (8) is located in the biodegradation zone (10); On the lower edge wall of the photocatalytic zone (2), water outlets (6) and valves are offered above the photocatalytic plate (3), and the water inlet (6) is set on the lower edge wall of the biodegradation zone (10). 7) and valves; A water circulation device is arranged on the reactor (9). 2. The water treatment reactor according to claim 1, characterized in that said water circulation device is a water pump (11), the water pump (11) is connected to the biodegradation zone (10), and the drainage of the water pump (11) The port is connected to the photocatalytic zone (2). 3. The water treatment reactor according to claim 1, characterized in that said water circulation device is an air pump (12), and the exhaust port of the air pump (12) leads into the lower part of the biodegradation zone (10). 4. The water treatment reactor according to claim 1, characterized in that the photocatalytic zone (2) is open above. 5. The water treatment reactor according to claim 1, characterized in that the photocatalytic zone (2) is covered by a quartz glass plate above. 6. The water treatment reactor according to claim 1, characterized in that the upper water hole (1) and the lower water hole (5) on the photocatalytic plate are respectively located at both ends of the reactor (9) in the length direction. 7. The water treatment reactor according to claim 1, characterized in that the biodegradation zone (10) is equipped with a biofilm carrier of ceramic material in the form of baffle or advection water flow. 8. A photocatalytic and biodegradable water treatment method, characterized in that: ① Hanging film of biofilm without ultraviolet irradiation; ②After successful film formation, the water undergoes photocatalytic degradation and biodegradation treatment repeatedly in the circulating flow, and the biodegradation process does not have ultraviolet light irradiation. 9. The water treatment method according to claim 8, characterized in that the film-hanging method of the biofilm is, when treating waste water or industrial waste water containing refractory organic matter, using activated sludge or for refractory organic pollutants The cultured special microbial strain solution is submerged in the biofilm carrier, the water circulates and flows, and the membrane-hanging time is 1-3 days. 10. The water treatment method according to claim 8, characterized in that the biofilm-forming method is to process micro-polluted water body or drinking water source water, which is naturally generated in the continuous film-forming process, and the film-forming time is 7 ~14 days.

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