Organic wastewater treatment system

Abstract

An organic wastewater treatment system comprises a container and an aeration system and is characterized in that the container is of a hollow structure, a water inlet is formed in the upper portion of one side of the container, and a water outlet is formed in the upper portion of the side opposite to the water inlet; the aeration system consists of a fan, a gas stripping pipe, a gas stripping gas inlet pipe and a gas inlet header pipe; the fan is arranged outside the container, and the air inlet header pipe is communicated with an air outlet of the fan; the gas stripping pipe is of a straight pipe structure with an opening in the upper end and is vertically arranged in the container; the gas inlet end of the gas stripping gas inlet pipe is communicated to the gas inlet header pipe, the gas outlet end of the gas stripping gas inlet pipe penetrates through the wall of the gas stripping pipe, is arranged in the gas stripping pipe and is bent upwards, organic wastewater flows upwards along the gas stripping pipe under the action of gas pressure in the gas stripping aeration pipe after entering the gas stripping pipe, and new organic wastewater enters from the bottom of the gas stripping pipe and enters the return pipe from the top of the gas pipe; and backflow is realized by flowing along the backflow pipe.

Description

Technical Field

[0001] The present invention designs a technical scope of clean production, belongs to the technical field of "three wastes" treatment, and specifically relates to an organic wastewater treatment system. Background Art

[0002] Organic wastewater is wastewater that is mainly composed of organic pollutants and is prone to cause eutrophication of water quality and is relatively harmful. Organic wastewater generally comes from wastewater discharged from industries such as papermaking, leather and food. These wastewaters contain a large amount of organic matter such as carbohydrates, fats, proteins, cellulose, etc. If discharged directly, they will cause serious pollution. Organic wastewater can be divided into three categories according to its nature and source: (1) organic wastewater that is easily biodegradable; (2) wastewater that contains organic matter that can be degraded but contains harmful substances; (3) organic wastewater that is difficult to biodegrade and harmful.

[0003] The water quality characteristics of organic wastewater are as follows: 1. High concentration of organic matter. COD in organic wastewater is generally above 2000 mg / L, and some are even as high as tens of thousands or even hundreds of thousands of mg / L. Relatively speaking, BOD is lower, and the ratio of BOD to COD in many organic wastewaters is less than 0.3.

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

[0005] 3. High chromaticity and peculiar smell. Regardless of whether it is organic or not, wastewater emits a pungent odor, causing adverse effects on the surrounding environment.

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

[0007] Physicochemical methods are often used as a pretreatment method in organic wastewater treatment. The purpose of pretreatment is to remove organic matter, improve biodegradability, reduce biochemical treatment load, and improve treatment efficiency by recovering useful components in wastewater or treating some difficult-to-biodegrade substances. In the process of physicochemical treatment, in order to reduce the COD in organic wastewater, aeration and reflux equipment are mostly used in the prior art for treatment. The traditional aeration method is to place the aerator at the bottom of the water body for direct aeration. At this time, the air blown in diffuses randomly in the water body, making the aeration effect unsatisfactory. Traditional reflux is mostly completed by a reflux pump, which has high energy consumption and is not conducive to clean production. Summary of the invention

[0008] The purpose of the present invention is to solve the deficiencies of the prior art and provide an organic wastewater treatment system with good aeration effect and low energy consumption of the entire system.

[0009] The present invention is achieved through the following technical solutions: An organic wastewater treatment system includes a container and an aeration system. The container is a hollow structure, with a water inlet on the upper part of one side of the container and a water outlet on the upper part of the side opposite to the water inlet. The aeration system is composed of a fan, an air lift pipe, an air lift air inlet pipe and an air intake main pipe. The fan is arranged outside the container, and the air intake main pipe is connected to the air outlet of the fan. The air lift pipe is a straight pipe structure with an upper end open and is vertically arranged in the container. The air inlet end of the air lift air inlet pipe is connected to the air intake main pipe, and the air outlet end passes through the wall of the air lift pipe and is arranged in the air lift pipe and bent upward. There is at least one air lift pipe, and the air lift air inlet pipe is the same number as the air lift pipe and is arranged correspondingly. The organic wastewater treatment system with this structure is suitable for adopting SBR, CASS or its improved process.

[0010] Preferably, it also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is arranged in the container and divides the internal space of the container into an anaerobic zone and an aerobic zone; the water inlet is arranged in the anaerobic zone, and the water outlet is arranged in the aerobic zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone; the water inlet end of the reflux pipe is arranged at the upper end of any gas lift pipe, and the water outlet end of the reflux pipe is inclined upward and passes through the partition and is arranged in the anaerobic zone; the small gas lift pipe supply pipe is a hollow tubular structure, one end of the small gas lift pipe supply pipe is connected to the reflux pipe, and the other end is connected to the air inlet main pipe, and the connection point between the small gas lift pipe supply pipe and the reflux pipe is arranged in the anaerobic zone and close to the partition; a water hole is opened at the bottom of the partition. The organic wastewater treatment system with this structure is suitable for contact oxidation process.

[0011] Preferably, it also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is two pieces, namely a first partition and a second partition, both of which are arranged in the container and divide the internal space of the container into an anaerobic / facultative anerobic zone, an aerobic zone and a sedimentation zone, wherein the anaerobic / facultative anerobic zone and the sedimentation zone are located on both sides of the aerobic zone; the first partition separates the anaerobic / facultative anerobic zone from the aerobic zone, and the second partition separates the aerobic zone from the sedimentation zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone and the sedimentation zone; The water inlet end of the return pipe is arranged at the upper end of any gas lift pipe located in the sedimentation zone, and the water outlet end of the return pipe is inclined upward and passes through the second partition and the first partition in sequence and is arranged in the anaerobic / anaerobic zone; the small gas lift pipe air supply pipe is a hollow tubular structure, one end of the small gas lift pipe air supply pipe is connected to the return pipe, and the other end is connected to the air intake main pipe, and the connection point of the small gas lift pipe air supply pipe and the return pipe is arranged in the aerobic zone and close to the second partition; a water hole is respectively opened at the bottom of the first partition and the upper part of the second partition. This structure of the organic wastewater treatment system is suitable for the AO activated sludge process.

[0012] The air lift pipe air inlet pipe and the small air lift pipe air supply pipe are both provided with air volume regulating valves.

[0013] A filler is arranged at the bottom of the container.

[0014] It also includes a support rod, one end of which is fixed to the inner wall of the container, and the other end of which is fixed to the gas lift pipe to ensure that the gas lift pipe is suspended in the container.

[0015] The lower end of the gas lift pipe is an open structure. Alternatively, the lower end of the gas lift pipe is a closed structure, and a plurality of holes are opened on the pipe wall of the lower end of the gas lift pipe.

[0016] The container is a leakproof container, which is constructed by any one of steel-concrete, steel structure, plastic, organic polymer compound, composite material or earth pit covering.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. When using SBR, CASS or its improved process, the entire organic wastewater treatment system requires at least one container and no reflux system is required; anaerobic, aerobic and sedimentation are achieved through automatic control during aeration operation to achieve standard discharge. During aeration, since the gas explodes in the gas pipe, the gas pipe limits the diffusion of the gas, making the impact of aeration stronger and the aeration effect better.

[0018] 2. When the contact oxidation process is adopted, the return pipe is connected to at least one air lift pipe in the aerobic tank to realize the return of air lift wastewater from the aerobic tank to the anaerobic tank for denitrification and denitrification treatment to remove total nitrogen; after the wastewater enters the aerobic tank, the lower end of the air lift pipe absorbs water and the upper end of the pipe outlet is used to remove water during operation, thus realizing cyclic aeration aerobic biochemical treatment to degrade COD, BOD and ammonia nitrogen. Because the energy consumption mainly comes from the water pressure of the air lift inlet pipe, and the air outlet of the air lift inlet pipe is located at the upper part of the water tank, the water pressure is low, and the energy consumption of the fan is also low, thus achieving the purpose of energy-saving aeration and energy saving and consumption reduction of wastewater treatment.

[0019] 3. When the AO activated sludge process is adopted, the sludge in the sedimentation area is lifted to the anaerobic / anaerobic area through the reflux pipe for denitrification and denitrification treatment to remove total nitrogen, avoiding the use of a special sludge pump for reflux, thereby reducing equipment and maintenance costs.

[0020] 4. By setting up a small air lift pipe and an air supply pipe, the reflux pipe can be refluxed through the air lift pipe, and the reflux can also be enhanced through the small air lift pipe and the air supply pipe.

[0021] The working principle of the gas lift reflux of the present invention is as follows: after the organic wastewater enters the gas lift pipe, it flows upward along the gas lift pipe under the action of the air pressure in the gas lift aeration pipe, and new organic wastewater enters from the bottom of the gas lift pipe and enters the reflux pipe from the top of the gas pipe, and flows along the reflux pipe to achieve reflux. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-3 It is a structural schematic diagram of the present invention; Figure 4 It is a schematic diagram of the installation method of the gas lift pipe and the container of the present invention.

[0023] In the figure, 1-container, 2-water inlet, 3-reflux pipe, 4-partition, 5-air lift pipe, 6-air lift air inlet pipe, 7-gas volume regulating valve, 8-air inlet main pipe, 9-fan, 10-water outlet, 11-aerobic zone, 12-water hole, 13-filler, 14-anaerobic zone, 15-small air lift air inlet pipe, 16-anaerobic / anaerobic zone, 17-sedimentation zone, 18-hole, 19-support rod, 20-first partition, 21-second partition. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited by the embodiments. Example 1

[0025] An organic wastewater treatment system includes a container and an aeration system. The container is a hollow structure, and a water inlet is provided on the upper part of one side of the container, and a water outlet is provided on the upper part of the side opposite to the water inlet. The aeration system is composed of a fan, an air lift pipe, an air lift air inlet pipe and an air inlet main pipe. The fan is arranged outside the container, and the air inlet main pipe is connected to the air outlet of the fan. The air lift pipe is a straight pipe structure with an upper end opening and is vertically arranged in the container. The air inlet end of the air lift air inlet pipe is connected to the air inlet main pipe, and the air outlet end passes through the wall of the air lift pipe and is arranged in the air lift pipe and bent upward. There is one air lift pipe, and the number of the air lift air inlet pipes is the same as that of the air lift pipes and they are arranged correspondingly. The air lift pipe air inlet pipe is provided with an air volume regulating valve. A filler is arranged at the bottom of the container. A support rod is also included, one end of which is fixed to the inner wall of the container, and the other end is fixed to the air lift pipe to ensure that the air lift pipe is suspended in the container. The lower end of the air lift pipe is an open structure. The container is a leakproof container, which is constructed by steel-concrete method.

[0026] This embodiment is suitable for using SBR, CASS or their improved processes. The entire organic wastewater treatment system only needs one container at least and does not need a reflux system. Anaerobic, aerobic and sedimentation are achieved through automatic control during aeration operation to achieve standard discharge. During aeration, since the gas explodes in the gas pipe, the gas pipe limits the diffusion of the gas, thereby making the impact of aeration stronger and the aeration effect better. Example 2

[0027] An organic wastewater treatment system comprises a container and an aeration system, wherein the container is a hollow structure, a water inlet is arranged on the upper part of one side of the container, and a water outlet is arranged on the upper part of the side opposite to the water inlet; the aeration system consists of a fan, an air lift pipe, an air lift air inlet pipe and an air inlet main pipe; the fan is arranged outside the container, and the air inlet main pipe is connected to the air outlet of the fan; the air lift pipe is a straight pipe structure with an upper end opening and is vertically arranged in the container; an air inlet end of the air lift air inlet pipe is connected to the air inlet main pipe, and an air outlet end passes through the pipe wall of the air lift pipe and is arranged in the air lift pipe and is bent upward.

[0028] It also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is arranged in the container and divides the internal space of the container into an anaerobic zone and an aerobic zone; the water inlet is arranged in the anaerobic zone, and the water outlet is arranged in the aerobic zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone; the water inlet end of the reflux pipe is arranged at the upper end of any gas lift pipe, and the water outlet end of the reflux pipe is inclined upward and passes through the partition and is arranged in the anaerobic zone; the small gas lift pipe supply pipe is a hollow tubular structure, one end of the small gas lift pipe supply pipe is connected to the reflux pipe, and the other end is connected to the air inlet main pipe, and the connection point between the small gas lift pipe supply pipe and the reflux pipe is arranged in the anaerobic zone and close to the partition; a water hole is opened at the bottom of the partition. The organic wastewater treatment system of this structure is suitable for contact oxidation process. There are 4 gas lift pipes, and the gas lift air inlet pipe is the same as the number of gas lift pipes and is arranged accordingly. The gas lift pipe air inlet pipe and the small gas lift pipe air supply pipe are both provided with gas volume regulating valves. The container is provided with fillers at the bottom. It also includes a support rod, one end of which is fixed to the inner wall of the container, and the other end is fixed to the gas lift pipe to ensure that the gas lift pipe is suspended in the container. The lower end of the gas lift pipe is a closed structure, and a plurality of holes are opened on the pipe wall at the lower end of the gas lift pipe. The container is a leakproof container, which is constructed by steel structure.

[0029] This embodiment is applicable to the contact oxidation process. The return pipe is connected to at least one air lift pipe in the aerobic tank to realize the return of air lift wastewater from the aerobic tank to the anaerobic tank for denitrification and denitrification treatment to remove total nitrogen. After the wastewater enters the aerobic tank, the lower end of the air lift pipe absorbs water and the upper end of the pipe port extracts water during operation, thus realizing cyclic aeration aerobic biochemical treatment to degrade COD, BOD and ammonia nitrogen. Because the energy consumption mainly comes from the water pressure of the air lift inlet pipe, and the air outlet of the air lift inlet pipe is located at the upper part of the water tank, the water pressure is low, and the energy consumption of the fan is also low, thus achieving the purpose of energy-saving aeration and energy saving and consumption reduction of wastewater treatment. Example 3

[0030] An organic wastewater treatment system comprises a container and an aeration system, wherein the container is a hollow structure, a water inlet is arranged on the upper part of one side of the container, and a water outlet is arranged on the upper part of the side opposite to the water inlet; the aeration system consists of a fan, an air lift pipe, an air lift air inlet pipe and an air inlet main pipe; the fan is arranged outside the container, and the air inlet main pipe is connected to the air outlet of the fan; the air lift pipe is a straight pipe structure with an upper end opening and is vertically arranged in the container; an air inlet end of the air lift air inlet pipe is connected to the air inlet main pipe, and an air outlet end passes through the pipe wall of the air lift pipe and is arranged in the air lift pipe and is bent upward.

[0031] It also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is two pieces, namely the first partition and the second partition, both of which are arranged in the container and divide the internal space of the container into an anaerobic / facultative anoxic zone, an aerobic zone and a sedimentation zone, wherein the anaerobic / facultative anoxic zone and the sedimentation zone are located on both sides of the aerobic zone; the first partition separates the anaerobic / facultative anoxic zone from the aerobic zone, and the second partition separates the aerobic zone from the sedimentation zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone and the sedimentation zone; the reflux pipe is provided in the container; the gas lift ... The water inlet end of the pipe is arranged at the upper end of any gas lift pipe located in the sedimentation zone, and the water outlet end of the return pipe is inclined upward and passes through the second partition and the first partition in sequence and is arranged in the anaerobic / anaerobic zone; the small gas lift pipe air supply pipe is a hollow tubular structure, one end of the small gas lift pipe air supply pipe is connected to the return pipe, and the other end is connected to the air intake main pipe, and the connection point between the small gas lift pipe air supply pipe and the return pipe is arranged in the aerobic zone and close to the second partition; a water hole is respectively provided at the bottom of the first partition and the upper part of the second partition. The organic wastewater treatment system of this structure is suitable for adopting the AO activated sludge process. There are 8 gas lift pipes, and the gas lift air inlet pipes are the same as the number of gas lift pipes and are arranged correspondingly; wherein 4 gas lift pipes are respectively arranged in the sedimentation zone and the aerobic zone. The gas lift pipe air inlet pipe and the small gas lift pipe air supply pipe are both provided with gas volume regulating valves. Filling is arranged at the bottom of the container. The container also includes a support rod, one end of which is fixed to the inner wall of the container, and the other end is fixed to the gas lift pipe to ensure that the gas lift pipe is suspended in the container. The lower end of the gas lift pipe is an open structure. The container is a leakproof container, which is constructed of organic polymer compounds.

[0032] When the AO activated sludge process is used, the sludge in the sedimentation zone is transported through the reflux pipe gas to the anaerobic / facultative anerobic zone for denitrification and denitrification to remove total nitrogen, avoiding the use of a dedicated sludge pump for reflux, thereby reducing equipment and maintenance costs.

Claims

1. An organic wastewater treatment system, comprising a container and an aeration system, characterized in that: The container is a hollow structure, with a water inlet on the upper part of one side of the container and a water outlet on the upper part of the side opposite to the water inlet; the aeration system consists of a fan, an air lift pipe, an air lift air inlet pipe and an air inlet main pipe; the fan is arranged outside the container, and the air inlet main pipe is connected to the air outlet of the fan; the air lift pipe is a straight pipe structure with an open upper end and is vertically arranged in the container; the air inlet end of the air lift air inlet pipe is connected to the air inlet main pipe, and the air outlet end passes through the wall of the air lift pipe and is arranged in the air lift pipe and bends upward.

2. An organic wastewater treatment system according to claim 1, characterized in that: There is at least one gas lift pipe, and the number of the gas lift air inlet pipes is the same as that of the gas lift pipes and they are arranged correspondingly.

3. An organic wastewater treatment system according to claim 2, characterized in that: It also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is arranged in the container and divides the internal space of the container into an anaerobic zone and an aerobic zone; the water inlet is arranged in the anaerobic zone, and the water outlet is arranged in the aerobic zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone; the water inlet end of the reflux pipe is arranged at the upper end of any gas lift pipe, and the water outlet end of the reflux pipe is inclined upward and passes through the partition and is arranged in the anaerobic zone; the small gas lift pipe supply pipe is a hollow tubular structure, one end of the small gas lift pipe supply pipe is connected to the reflux pipe, and the other end is connected to the air inlet main pipe, and the connection point between the small gas lift pipe supply pipe and the reflux pipe is arranged in the anaerobic zone and close to the partition; a water hole is opened at the bottom of the partition.

4. The organic wastewater treatment system according to claim 2, characterized in that: It also includes a partition, a reflux pipe and a small gas lift pipe supply pipe; the partition is two pieces, namely the first partition and the second partition, both of which are arranged in the container and divide the internal space of the container into an anaerobic / facultative anoxic zone, an aerobic zone and a sedimentation zone, wherein the anaerobic / facultative anoxic zone and the sedimentation zone are located on both sides of the aerobic zone; the first partition separates the anaerobic / facultative anoxic zone from the aerobic zone, and the second partition separates the aerobic zone from the sedimentation zone; the gas lift pipe and the gas lift air inlet pipe are both arranged in the aerobic zone and the sedimentation zone; the reflux pipe is provided in the aerobic zone and the sedimentation zone; the gas lift pipe is provided in the gas lift pipe and the gas lift air inlet pipe are provided in the gas lift pipe and the sedimentation zone; the gas lift pipe is provided in the gas lift pipe and the gas lift air inlet pipe; the gas lift pipe is provided in the gas lift pipe and the gas lift ... The water inlet end of the pipe is arranged at the upper end of any gas lift pipe located in the sedimentation zone, the water outlet end of the return pipe is inclined upward and passes through the second partition and the first partition in sequence and is arranged in the anaerobic / anaerobic zone; the small gas lift pipe air supply pipe is a hollow tubular structure, one end of the small gas lift pipe air supply pipe is connected with the return pipe, and the other end is connected to the air intake main pipe, and the connection point between the small gas lift pipe air supply pipe and the return pipe is arranged in the aerobic zone and close to the second partition; a water hole is respectively opened at the bottom of the first partition and the upper part of the second partition.

5. An organic wastewater treatment system according to any one of claims 1 to 4, characterized in that: The air lift pipe air inlet pipe and the small air lift pipe air supply pipe are both provided with air volume regulating valves.

6. The organic wastewater treatment system according to claim 5, characterized in that: A filler is arranged at the bottom of the container.

7. An organic wastewater treatment system according to claim 6, characterized in that: It also includes a support rod, one end of which is fixed to the inner wall of the container, and the other end of which is fixed to the gas lift pipe to ensure that the gas lift pipe is suspended in the container.

8. The organic wastewater treatment system according to claim 7, characterized in that: The lower end of the air lift pipe is an open structure.

9. The organic wastewater treatment system according to claim 7, characterized in that: The lower end of the gas lift pipe is a closed structure, and a plurality of holes are opened on the pipe wall of the lower end of the gas lift pipe.

10. An organic wastewater treatment system according to any one of claims 1-4 and 6-9, characterized in that: The container is a leakproof container, which is constructed by any one of steel-concrete, steel structure, plastic, organic polymer compound, composite material or earth pit covering.

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