CN107601780B - A method of utilizing laser treatment ammonia nitrogen in sewage organic matter - Google Patents

Abstract

The invention belongs to the technical field of sewage treatment and provides a method for treating ammonia nitrogen organic matter in sewage by using laser. In this method, after sedimentation and anaerobic treatment, the sewage is put into the soil infiltration treatment tank to remove organic pollutants and phosphorus pollutants, and water rich in ammonia nitrogen pollutants is obtained, which is then attached to the adsorption material in the photoreaction tube. The photocatalyst is used to catalyze the degradation, and the high energy of the laser is used to promote the breaking of chemical bonds, so as to remove the ammonia nitrogen pollutants in the water and complete the treatment of sewage. Compared with the traditional method, the treatment method of the present invention can effectively remove organic pollutants, phosphorus pollutants and ammonia nitrogen pollutants in sewage, and at the same time, the laser irradiation in the whole process is highly controllable, can be used repeatedly, has high treatment efficiency, and has high treatment effect. Good, simple operation, low cost, and can be used for large-scale popularization and application.

Description

A Method of Using Laser to Treat Ammonia Nitrogen Organic Matter in Sewage

technical field

The invention belongs to the technical field of sewage treatment and provides a method for treating ammonia nitrogen organic matter in sewage by using laser.

Background technique

Water is the origin of life, and water is the basis for the survival of all life on earth. With the development of industry, the increase of population, the intensification of urbanization and the increase of the use of chemical fertilizers and pesticides, water, which is the source of life, has been seriously polluted. Water pollution refers to pollutants entering rivers, lakes, oceans or groundwater, changing the physical and chemical properties of water quality and sediment or the composition of biological communities, causing deterioration of water quality, reducing the use value and function of water bodies, endangering human health or destroying ecology environmental phenomenon.

The causes of water pollution are both natural and man-made. We generally refer to water pollution as man-made pollution, mainly including domestic sewage, industrial wastewater, hospital sewage, runoff and infiltration of farmland water, and stacking of solid waste. Water pollution from landfills, etc. At this stage, the water crisis caused by water pollution in various countries has become increasingly serious. It is not only harmful to agriculture, fishery, and industry, but also seriously threatens human health and restricts the economic development of various countries, especially the water pollution incidents that have occurred in recent years. shocking. Therefore, it is extremely urgent to cherish and protect water resources and strengthen water pollution control and prevention.

Among all kinds of water pollutants, ammonia nitrogen exists in many industrial wastewaters. The large discharge of ammonia nitrogen not only causes water environmental pollution, eutrophication of water bodies, and red tides in water bodies, but also causes water pollution in industrial wastewater treatment and reuse projects. Microorganisms multiply in the equipment, forming biofouling, blocking pipes and water equipment, and affecting heat exchange. A large amount of sewage containing ammonia nitrogen is discharged into rivers and lakes, causing eutrophication of natural water bodies, and at the same time brings great difficulties to the treatment of domestic and industrial water. At present, ammonia nitrogen treatment has good practicability, and the most widely used technologies in China are: biological denitrification method, ammonia stripping method, breakpoint chlorination method, chemical precipitation method, ion exchange method, liquid membrane method, soil irrigation method, etc.

In the treatment technology of ammonia nitrogen sewage, the biological treatment of ammonia nitrogen sewage is relatively stable, the removal rate of total nitrogen can reach 70% to 95%, and the treatment efficiency is high. It is the most widely used method at home and abroad. The ammonia stripping method has mature technology, high stripping efficiency and stable operation, but the power consumption is large, the tower wall is easy to scale, and the efficiency will be reduced in cold seasons; the chemical precipitation method is simple in process and high in efficiency, but the dosage is large; Absorption method, higher ammonia nitrogen and salt content can effectively inhibit the osmotic distillation flux of water, and there will be a certain leakage problem; for the treatment of ammonia nitrogen wastewater with relatively simple components, in the physical and chemical methods, stripping method and membrane absorption method are more economical. An effective choice; if the sewage composition is relatively complex, such as a high content of oily pollutants, pretreatment such as air flotation is required first. For high-concentration ammonia-nitrogen wastewater, in order to ensure that the effluent meets the discharge standards, a combined process of physical and chemical methods and biological methods is used instead of a single process to completely remove ammonia nitrogen in wastewater.

At present, domestic and foreign ammonia nitrogen sewage treatment has achieved certain results. Among them, Zeng Ziping and others invented a method for the advanced treatment of ammonia nitrogen sewage (China Invention Patent Application No. 200710066334.9), which was innovatively integrated on the basis of traditional ammonia nitrogen sewage treatment methods, combining physical, chemical and biological treatment methods. , that is: use improved anaerobic and aerobic processes, and membrane separation and biological treatment technologies to treat ammonia nitrogen sewage with low BOD5, and discharge or reuse the ammonia nitrogen sewage after treatment, but this method has no effect on the treatment of ammonia nitrogen sewage with complex components. Good, and there is a certain leakage of the liquid film. In addition, Lin Jiamei and others invented a decentralized high-ammonia-nitrogen wastewater treatment method (China Invention Patent Application No. 201510257240.4). Firstly, the wastewater is collected into the regulating tank and the anaerobic reaction tank for flow reaction, and then the effluent from the anoxic reaction tank is input into the The aerated aerobic reaction is carried out in the aerated aerobic tank. In the early stage of operation, diatom concentrate is added to the aerated aerobic reaction tank at one time, and then the effluent from the aerated aerobic tank is input into the artificial wetland and further improved by plants Finally, the effluent from the artificial wetland is discharged into the natural water system, but the nitrification effect of this method is not thorough enough, resulting in poor treatment efficiency of ammonia nitrogen organic matter, and the whole process is relatively complicated.

It can be seen that in the existing technology, there are traditional treatment technologies with low efficiency, high energy consumption, and poor treatment effect of ammonia nitrogen pollutants. Currently, the most widely used traditional biological denitrification has slow growth of nitrifying bacteria, resulting in low indicators of ammonia nitrogen removal by nitrification. At the same time, there is no mature laser treatment method for ammonia nitrogen sewage.

Contents of the invention

The purpose of the present invention is to provide a method for treating ammonia nitrogen organic matter in sewage by using laser. In this method, after sedimentation and anaerobic treatment, the sewage is put into the soil infiltration treatment tank to remove organic pollutants and phosphorus pollutants, and ammonia nitrogen rich Pollutant water is then catalyzed and degraded by the photocatalyst attached to the adsorption material in the photoreaction tube, and the high energy of the laser is used to promote the breaking of chemical bonds to remove the ammonia nitrogen pollutants in the water and complete the treatment of sewage, which can solve the general Ammonia nitrogen wastewater treatment technology has problems such as low efficiency, high energy consumption, and poor treatment effect of ammonia nitrogen pollutants, especially the slow growth of nitrifying bacteria in the most widely used traditional biological denitrification, resulting in low indicators of ammonia nitrogen removal by nitrification.

The concrete technical scheme that the present invention relates to is as follows:

A method of using laser to treat ammonia nitrogen organic matter in sewage. After sedimentation and anaerobic treatment, the sewage is put into the soil infiltration treatment tank to remove organic pollutants and phosphorus pollutants, and water rich in ammonia nitrogen pollutants is obtained. The photocatalyst attached to the adsorption material in the reaction tube is catalyzed and degraded, and the high energy of the laser is used to promote the breaking of chemical bonds to remove ammonia nitrogen pollutants in the water and complete the treatment of sewage. The specific steps of sewage treatment are as follows:

(1) The sewage is first introduced into the pretreatment system, after sedimentation and anaerobic treatment, it is evenly put into the soil infiltration treatment tank with a certain hydraulic load under artificial control, and the sewage infiltrates downward through the aerated soil Slowly infiltrate, infiltrate and diffuse to the surrounding soil, intercept, transform and degrade organic pollutants and phosphorus pollutants in sewage under the combined action of soil adsorption, microbial action and ecological effects, and recycle them through underground water collection pipes Treat water to obtain water rich in ammonia nitrogen pollutants;

(2) Use a photoreaction tube equipped with an adsorption material, attach a photocatalyst to the adsorption material, and set a laser emitter and a reflection mirror combination in the reaction tube, pass the water rich in ammonia nitrogen collected in step (1) into the In the photoreaction tube, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material on the one hand, and undergo a degradation reaction under the action of the photocatalyst; Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

Wherein, the sewage in step (1) refers to domestic sewage or commercial sewage. Domestic sewage includes sewage, sanitary sewage, sewer sewage, etc. of residences, office buildings, institutions, etc., and commercial sewage includes sewage from restaurants, sewage from laundry rooms, and sewage from animal breeding. , Sewage from hair salons, etc.

Preferably, the sedimentation treatment in step (1) adopts an advection sedimentation tank, the height of the inflow baffle is 0.1-0.15m above the water surface, the immersion depth is 0.5-1m, and the distance from the water inlet is 0.5-1m.

Preferably, the anaerobic treatment in step (1) adopts two stages of digesters connected in series, the first stage is a high-speed digester, the second stage is a traditional digester, and the treatment time ratio is 1:1-1:4.

Preferably, the pipelines of the soil infiltration treatment tank in step (1) are laid in two layers, that is, water distribution pipes and water collection pipes; the diameter of the water distribution pipes is 100-120mm, and the buried depth is 0.4-0.6m; The pipe diameter of the water collection pipe is 150-170mm, and the buried depth is 2-2.1m.

Preferably, the area load of the soil infiltration treatment tank in step (1) is 0.03-0.04m ³ /m ² ·d, the volume load is 0.02-0.03m ³ /m ³ ·d, and the net depth of the bed is 1.5- 1.6m.

Preferably, the tank body of the soil infiltration treatment tank in step (1) is made of a composite anti-seepage geomembrane material, and the backfill of the bed body from bottom to top is as follows: sand filter layer 8-12cm, artificial soil layer 130-140cm, backfill Planting soil layer 30 ~ 40cm.

Preferably, the adsorption material in step (2) is at least one of polyacrylamide, silica gel, alumina, activated carbon or zeolite.

Preferably, the photocatalyst in step (2) is at least one of titanium dioxide, zirconium dioxide, zinc oxide, tin oxide or cadmium sulfide.

Preferably, the laser emitter in step (2) is a solid-state laser emitter, a liquid laser emitter, a gas laser emitter or a semiconductor laser emitter, and the laser frequency generated is 4.5-6.5×10 ¹⁴ Hz.

Sedimentation tanks are generally structures used for sludge-water separation before or after biochemical reactions, especially for sludge with finer particles. After passing through the sedimentation tank, finer inorganic sludge and organic sludge are removed. In the digester, anaerobic microorganisms may degrade or partially degrade some organic matter that aerobic microorganisms cannot degrade. Therefore, for some wastewater containing refractory organic matter, pretreatment by anaerobic process can obtain better treatment effect, or improve the biodegradability of sewage, and improve the treatment effect of subsequent aerobic treatment process.

Soil infiltration treatment is an on-site sewage treatment technology. Using ecological principles and environmental engineering technology, the pretreated sewage is put into a soil layer with a certain structure and good diffusion performance. Slowly infiltrate, infiltrate and diffuse to the surrounding soil, absorb, adsorb, precipitate, complex, ion exchange, redox, degrade or transform pollutants in sewage through soil adsorption, microbial biochemical action and ecological effects and other processes to realize the purification, regeneration and recycling of sewage. Therefore, the present invention adopts this technology as one of the important links of sewage treatment. The soil infiltration treatment system has a good effect on the removal of phosphorus, mainly through the biological assimilation and chemical phosphorus fixation of soil microorganisms, and the phosphorus removal effect can be improved by increasing the pH value. At the same time, by forming an alternate environment of aerobic, anoxic and anaerobic in the soil, different nutritional microorganisms can be provided with their own suitable living environment. Through the combination of microorganisms and soil fillers, various microorganisms in water are removed. However, the indicators of total nitrogen and ammonia nitrogen pollutants in the sewage treated by soil infiltration still exceed the standard, so it needs to continue to be treated.

Photocatalytic technology is a green technology with important application prospects in the fields of energy and the environment. Under the irradiation of light, organic pollutants can be completely degraded into carbon dioxide and water, and the photocatalytic material itself has no loss. The core of photocatalytic technology is photocatalyst, which is mainly a semiconductor compound with photocatalytic activity. The laser has high energy and the direction is controllable. The photocatalyst has a high absorption efficiency of the laser, which is beneficial to improve the quantum efficiency of photocatalysis. At the same time, the high energy of the laser acts on the pollutants, which improves the reactivity and makes the chemical bonds easier to break. . Therefore, the present invention uses a laser emitter to carry out photocatalytic treatment of sewage under the action of laser light, and can remove ammonia nitrogen pollutants in sewage. At the same time, an anti-transmissive mirror is set to improve the utilization efficiency of the laser, so that the ammonia nitrogen pollutants can be removed more thoroughly.

The treatment method of the present invention is compared with conventional physical, chemical or biological treatment methods, and its post-treatment discharge standard, main pollutant content range and unit treatment cost are as shown in Table 1. It can be seen that the method of the present invention can significantly reduce the content of ammonia nitrogen pollutants in the effluent water under the premise of ensuring that the organic pollutants and phosphorus pollutants meet the standards, and meet the first-level discharge standards, and the unit treatment cost is low.

Table 1

Performance Reachable emission standard Organic Pollutant Content Phosphorus pollutant content Ammonia nitrogen pollutant content Processing cost (yuan/t) conventional physics Level three up to standard up to standard 50～100mg/L 0.6～0.8 conventional chemical method Secondary up to standard up to standard 25～50mg/L 0.8～1 conventional biological method Secondary up to standard up to standard 25～50mg/L 0.8～1 The method of the invention level one up to standard up to standard 5～10mg/L 0.4～0.6

The invention provides a method for treating ammonia nitrogen organic matter in sewage by using laser. Compared with the prior art, its outstanding features and excellent effects are:

1. The treatment method of the present invention can effectively remove organic pollutants, phosphorus pollutants and ammonia nitrogen pollutants in the sewage, and the treated water can reach the first-class discharge standard.

2. The processing method of the present invention adopts a photoreaction tube and uses a laser as a light source, which has high energy, strong controllability, high photoreaction speed, high processing efficiency and good processing effect.

3. In the processing method of the present invention, the anti-transmissive mirror is arranged in the photoreaction tube, so that the laser can be used repeatedly, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants are removed more thoroughly.

4. The processing method of the present invention has simple operation and low cost, and can be used for large-scale popularization and application.

Detailed ways

The present invention will be further described in detail through specific embodiments below, but it should not be understood that the scope of the present invention is limited to the following examples. Without departing from the above-mentioned method idea of the present invention, various replacements or changes made according to common technical knowledge and customary means in this field shall be included in the scope of the present invention.

Example 1

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Firstly, the sewage is introduced into the pretreatment system, and after sedimentation and anaerobic treatment of two-stage digestion tanks in series, the treatment time ratio of the first stage and the second stage is 1:1, and then it is artificially controlled with a certain hydraulic load. Put them evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 100mm, and the buried depth is 0.6m. The area load of the treatment tank is 0.04m ³ /m ² ·d, the volume load is 0.03 m ³ /m ³ ·d, the net depth of the bed is 1.5m, and the tank body is made of composite anti-seepage geomembrane. From bottom to top: The sand filter layer is 12cm, the artificial soil layer is 130cm, and the backfill planting soil layer is 40cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. The water is reclaimed and treated through the underground water collection pipeline to obtain water rich in ammonia nitrogen pollutants; a photoreaction tube with polyacrylamide as the adsorption material is used, tin oxide is attached to the adsorption material, and a solid is set in the reaction tube. Combination of laser transmitter and reflective mirror. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 1 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Example 2

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Sewage is first introduced into the pretreatment system, and after sedimentation and anaerobic treatment of two-stage series digesters, the treatment time ratio of the first stage and the second stage is 1:4, and then it is artificially controlled with a certain hydraulic load. Put them evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 100mm, and the buried depth is 0.6m. The area load of the treatment tank is 0.04m ³ /m ² ·d, the volume load is 0.02 m ³ /m ³ ·d, the net depth of the bed is 1.6m, and the tank is made of composite anti-seepage geomembrane. From bottom to top: The sand filter layer is 8cm, the artificial soil layer is 130cm, and the backfill planting soil layer is 40cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. The water is reclaimed and treated through underground water collection pipes to obtain water rich in ammonia nitrogen pollutants; a photoreaction tube with activated carbon as the adsorption material is used, zirconium dioxide is attached to the adsorption material, and a liquid laser is set in the reaction tube Emitter and anti-reflective mirror combination. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 2 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Example 3

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Firstly, the sewage is introduced into the pretreatment system, and after sedimentation and anaerobic treatment in two-stage series digesters, the treatment time ratio of the first stage and the second stage is 1:2, and then it is artificially controlled with a certain hydraulic load. Put them evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 110mm, and the buried depth is 0.5m. The area load of the treatment tank is 0.03m ³ /m ² ·d, the volume load is 0.03 m ³ /m ³ ·d, the net depth of the bed is 1.5m, and the tank body is made of composite anti-seepage geomembrane. From bottom to top: The sand filter layer is 10cm, the artificial soil layer is 135cm, and the backfill planting soil layer is 35cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. Recycling and treating water through underground water collection pipes to obtain water rich in ammonia nitrogen pollutants; using a photoreaction tube with zeolite as an adsorption material, attaching cadmium sulfide to the adsorption material, and setting a gas laser emission tube in the reaction tube device and reflective mirror combination. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 3 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Example 4

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Firstly, the sewage is introduced into the pretreatment system, and after sedimentation and anaerobic treatment of two-stage digestion tanks in series, the treatment time ratio of the first stage and the second stage is 1:3, and then it is artificially controlled with a certain hydraulic load. Put it evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 100mm, and the buried depth is 0.4m. , the area load of the treatment tank is 0.04m ³ /m ² ·d, the volume load is 0.03 m ³ /m ³ ·d, the net depth of the bed is 1.5m, and the tank body is made of composite anti-seepage geomembrane, from bottom to top is : Sand filter layer 9cm, artificial soil layer 138cm, backfill planting soil layer 32cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. The water is reclaimed and treated through underground water collection pipes to obtain water rich in ammonia nitrogen pollutants; a photoreaction tube with alumina as the adsorption material is used, zinc oxide is attached to the adsorption material, and a semiconductor laser is set in the reaction tube Emitter and anti-reflective mirror combination. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 4 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Example 5

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Sewage is first introduced into the pretreatment system, and after sedimentation and anaerobic treatment of two-stage series digesters, the treatment time ratio of the first stage and the second stage is 1:4, and then it is artificially controlled with a certain hydraulic load. Put them evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 115mm, and the buried depth is 0.5m. The area load of the treatment tank is 0.03m ³ /m ² ·d, the volume load is 0.03 m ³ /m ³ ·d, the net depth of the bed is 1.5m, and the tank body is made of composite anti-seepage geomembrane. From bottom to top: The sand filter layer is 11cm, the artificial soil layer is 135cm, and the backfill planting soil layer is 35cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. Recycling and treating water through underground water collection pipes to obtain water rich in ammonia nitrogen pollutants; adopting a photoreaction tube with silica gel as the adsorption material, attaching zirconia to the adsorption material, and setting a solid-state laser in the reaction tube Emitter and anti-reflective mirror combination. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 5 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Example 6

A method for treating ammonia nitrogen organic matter in sewage by laser, the specific process of treating sewage is as follows:

Firstly, the sewage is introduced into the pretreatment system, and after sedimentation and anaerobic treatment of two-stage digestion tanks in series, the treatment time ratio of the first stage and the second stage is 1:1, and then it is artificially controlled with a certain hydraulic load. Put them evenly into the soil infiltration treatment tank. The treatment tank is laid with two layers of pipes, the water distribution pipe and the water collection pipe. The pipe diameter of the water distribution pipe is 100mm, and the buried depth is 0.6m. The area load of the treatment tank is 0.04m ³ /m ² ·d, the volume load is 0.025 m ³ /m ³ ·d, the net depth of the bed is 1.55m, and the tank body is made of composite anti-seepage geomembrane. From bottom to top: The sand filter layer is 12cm, the artificial soil layer is 135cm, and the backfill planting soil layer is 35cm. The sewage infiltrates downward through the air-permeable soil, slowly infiltrates, infiltrates and diffuses to the surrounding soil. Under the joint action of soil adsorption, microbial action and ecological effect, the organic pollutants and phosphorus pollution in the sewage are intercepted, transformed and degraded. The water is reclaimed and treated through underground water collection pipes to obtain water rich in ammonia nitrogen pollutants; a photoreaction tube with polyacrylamide as the adsorption material is used, titanium dioxide is attached to the adsorption material, and a semiconductor laser is set in the reaction tube Emitter and anti-reflective mirror combination. Pass the water rich in ammonia nitrogen into the photoreaction tube. On the one hand, the ammonia nitrogen pollutants in the water are adsorbed by the adsorption material and undergo a degradation reaction under the action of the photocatalyst. On the other hand, under the high energy concentration of the laser, the chemical bonds fracture, further accelerating its degradation. Under the action of the anti-transmissive mirror combination, the utilization efficiency of the laser is improved, and the ammonia nitrogen pollutants in the water are removed more thoroughly.

The method of Example 6 is used for treatment. The discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Comparative example 1

No laser emitter and reflective mirror are used, and other processing procedures and processing conditions are consistent with Embodiment 6.

Using the method of Comparative Example 1 for treatment, the discharge level of the treated water, the content range of various pollutants, and the treatment cost per ton of sewage are shown in Table 2.

Table 2

Performance Reachable emission standard Organic Pollutant Content Phosphorus pollutant content Ammonia nitrogen pollutant content Processing cost (yuan/t) Comparative example 1 Level three up to standard up to standard 50～100mg/L 0.8～1 Example 1 level one up to standard up to standard 5～10mg/L 0.4～0.6 Example 2 level one up to standard up to standard 5～10mg/L 0.4～0.6 Example 3 level one up to standard up to standard 5～10mg/L 0.4～0.6 Example 4 level one up to standard up to standard 5～10mg/L 0.4～0.6 Example 5 level one up to standard up to standard 5～10mg/L 0.4～0.6 Example 6 level one up to standard up to standard 5～10mg/L 0.4～0.6

Claims (7)

1. a kind of method using laser treatment ammonia nitrogen in sewage organic matter, which is characterized in that by sewage through precipitation, Anaerobic Treatment Afterwards, it puts into and removes organic pollution and phosphor contaminant in soil filtration treatment trough, obtain the water rich in ammonia nitrogen pollutant, then exist The photochemical catalyst catalytic degradation being attached in light reaction pipe on sorbing material, and promote chemical bond disconnected using the high-energy of laser It splits, to remove the ammonia nitrogen pollutant in water, completes the processing to sewage, sewage disposal is as follows：

（1）First sewage is introduced into pretreatment system, it is negative with certain waterpower under artificial control after precipitation and Anaerobic Treatment Lotus equably launches it in soil filtration treatment trough, and sewage is percolated downwards by aeration soil, slowly to surrounding soil Infiltration, diafiltration and diffusion, under the collective effect of adsorption by soil, microbial action and ecological effect, retention, conversion, degradation Except the organic pollution and phosphor contaminant in decontaminated water, water is recycled by underground collecting conduit, obtains being rich in ammonia and nitrogen pollution The water of object；

（2）Using the light reaction pipe for being provided with sorbing material, adhere to photochemical catalyst on the adsorbent material, and be arranged in reaction tube Laser emitter and the combination of anti-diaphotoscope, by step（1）The water rich in ammonia nitrogen collected is passed through in light reaction pipe, the ammonia nitrogen in water On the one hand pollutant is adsorbed by sorbing material, degradation reaction occurs under the action of photochemical catalyst, on the other hand in laser Under the effect of high-energy concentration, chemical bond is broken, and further speeds up its degradation, while under the action of anti-diaphotoscope combines, The utilization ratio of laser improves so that the ammonia nitrogen pollutant in water is removed more thorough;The sorbing material is polyacrylamide At least one of amine, silica gel, aluminium oxide, activated carbon or zeolite;The photochemical catalyst is titanium dioxide, zirconium dioxide, oxidation At least one of zinc, tin oxide or cadmium sulfide.

2. a kind of method using laser treatment ammonia nitrogen in sewage organic matter according to claim 1, it is characterised in that：Step （1）It is to be higher by 0.1~0.15m of the water surface, submergence that the precipitation process, which uses rectangular sedimentation tank, the height for the baffle that becomes a mandarin, For 0.5~1m, away from 0.5~1m of water inlet.

3. a kind of method using laser treatment ammonia nitrogen in sewage organic matter according to claim 1, it is characterised in that：Step （1）It is high speed digester that the Anaerobic Treatment, which uses two-stage series connection digester, the first order, and the second level is traditional digester, processing Time ratio is 1:1~1:4.

4. a kind of method using laser treatment ammonia nitrogen in sewage organic matter according to claim 1, it is characterised in that：Step （1）The pipeline of the soil filtration treatment trough is laid in 2 layers, i.e. sparge pipe and collector pipe；The caliber of the sparge pipe be 100~ 120mm, buried depth are 0.4~0.6m；The caliber of the collector pipe is 150~170mm, and buried depth is 2~2.1m.

5. according to a kind of method using laser treatment ammonia nitrogen in sewage organic matter of claim 1 or 4, it is characterised in that： Step（1）The volume loading rate of the soil filtration treatment trough is 0.03~0.04m³/m²D, volume load be 0.02~ 0.03m³/m³D, the net depth of bed body are 1.5~1.6m.

6. according to a kind of method using laser treatment ammonia nitrogen in sewage organic matter of claim 1 or 4, it is characterised in that： Step（1）The groove body of the soil filtration treatment trough uses composite anti-penetrating geo-membrane material, bed body backfill to be from bottom to top followed successively by： 8~12cm of sand filter blanket, 130~140cm of artificial soil horizon, 30~40cm of backfill planting soil layer.

7. a kind of method using laser treatment ammonia nitrogen in sewage organic matter according to claim 1, it is characterised in that：Step （2）The laser emitter is Solid State Laser transmitter, liquid laser transmitter, gas laser transmitter or semiconductor laser hair Emitter, it is 4.5~6.5 × 10 to generate laser frequency¹⁴Hz。