CN219860845U - An A2O-MBR integrated low-concentration organic wastewater treatment system - Google Patents

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to an A2O-MBR integrated low-concentration organic wastewater treatment system. The system includes anaerobic tank, hydrolysis acidification tank, contact oxidation tank, MBR tank and disinfection tank that are connected in sequence; the anaerobic tank, hydrolysis acidification tank and contact oxidation tank are respectively equipped with fillers, and the MBR tank is connected with the anaerobic tank and contact oxidation tank respectively. There is a sludge return mechanism between the tanks, the anaerobic tank and the contact oxidation tank are respectively equipped with water inlet and distribution devices; the hydrolysis and acidification tank is equipped with an outlet overflow device. The integrated wastewater treatment device of this application can completely purify the pollutants in low-concentration organic wastewater, and the entire system does not require civil construction. The equipment occupies a small area, the construction period is short, the equipment investment and operating costs are low, the operation and management are simple, and the equipment water output can reach The process and product water standards in the "Industrial Water Quality for Urban Wastewater Recycling" (GB/T 19923-2005) can all be reused in production, truly achieving zero discharge of wastewater.

Description

An A2O-MBR integrated low-concentration organic wastewater treatment system

Technical field

The utility model relates to the technical field of wastewater treatment, in particular to an A2O-MBR integrated low-concentration organic wastewater treatment system.

Background technique

Most of the small processing plants in our country will clean the products in the later stage, and the wastewater generated is often discharged directly, which not only has a certain impact on the environment, but also causes a waste of water resources. In the face of the increasing number of domestic Due to strict environmental control, the drainage problem of such factories has also become a survival issue for the company.

At present, the amount of wastewater generated by most small product processing plants in China is less than 10 tons/day. Due to the constraints of factory land and input costs, there is basically no complete sewage treatment system. Most of them are directly discharged in violation of regulations. In order to solve the drainage problem of such plants, there is an urgent need for a treatment technology and equipment that is easy to operate, has good effects, takes up little space, and is low-cost.

Utility model content

In view of the above problems of the prior art, the purpose of this utility model is to provide an A2O-MBR integrated low-concentration organic wastewater treatment system with small footprint and high treatment effect, which effectively solves the problem of reuse of low-concentration organic wastewater after treatment technical problems and solved the problem of wastewater discharge for enterprises.

In order to achieve the above purpose and other related purposes, the utility model provides an A2O-MBR integrated low-concentration organic wastewater treatment system, including an anaerobic tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR tank and a disinfection tank that are connected in sequence; The anaerobic tank, the hydrolysis acidification tank, and the contact oxidation tank are respectively provided with fillers. The MBR tank is provided with a sludge return mechanism between the anaerobic tank and the contact oxidation tank. The anaerobic tank and the contact oxidation tank are respectively provided with fillers. There is a water inlet and water distribution device; the hydrolysis and acidification tank is equipped with a water outlet overflow device.

In some embodiments of the present invention, the anaerobic tank is an upper water inlet, the bottom of the anaerobic tank is connected with the bottom of the hydrolysis acidification tank, the hydrolysis acidification tank is an upper water outlet, and the hydrolysis acidification tank is an upper water outlet. The top of the pool is connected with the contact oxidation pool.

In some embodiments of the present invention, the contact oxidation tank includes a connected first contact oxidation unit and a second contact oxidation unit. The top of the hydrolysis acidification tank is connected with the top of the first contact oxidation unit. The first contact oxidation unit The bottom of the oxidation unit is connected to the bottom of the second contact oxidation unit, the top of the second contact oxidation unit is connected to the top of the MBR pool, and the bottom of the MBR pool is connected to the disinfection pool.

In some embodiments of the present invention, the sludge return mechanism is respectively connected with the water inlet end of the anaerobic tank, the water inlet end of the contact oxidation tank, and the water outlet end of the MBR tank.

In some embodiments of the present invention, the filler is biological rope filler.

In some embodiments of the present invention, the water inlet and water distribution device is a water distribution triangular weir.

In some embodiments of the present invention, the water outlet overflow device is an overflow triangular weir.

In some embodiments of the present invention, the filler filling rate in the anaerobic tank, hydrolysis acidification tank, and contact oxidation tank is 50%-80% of the effective tank volume.

In some embodiments of the present invention, the load on the water distribution triangular weir and the overflow triangular weir is 1-2L/(m·s).

In some embodiments of the present invention, the sludge return ratio from the MBR tank to the contact oxidation tank is 30%-50%.

In some embodiments of the present invention, an immersed MBR membrane is provided in the MBR pool.

In some embodiments of the present invention, the MBR membrane in the MBR pool is a hollow fiber membrane made of PTFE, and the membrane flux is 0.3m ³ /m ² ·d-0.5m ³ /m ² ·d.

In some embodiments of the present invention, there is a microporous aeration device in the contact oxidation tank, and the system also includes an equipment room. A fan is provided in the equipment room, and the fan and the microporous aeration device Connected.

The above technical solution has the following technical effects:

This application improves the wastewater treatment system, adopts A2O-MBR integration, and adopts a combined biochemical and physical-chemical process at the end. It can not only further degrade COD through high-concentration sludge, but also use the filtration effect of the membrane to make difficult-to-use water difficult to digest. Dissolved COD and SS are further removed, ensuring stable effluent quality and providing a stable guarantee for water reuse. The integrated wastewater treatment device can completely purify pollutants in low-concentration organic wastewater, and the entire system does not require Civil construction, the equipment occupies a small area, the construction period is short, the equipment investment and operating costs are low, the operation and management are simple, and the water produced by the equipment can meet the process and product water standards in the "Industrial Water Quality for Urban Wastewater Recycling" (GB/T 19923-2005) , can all be reused in production, truly achieving zero discharge of waste water.

Description of the drawings

Figure 1 is a schematic structural diagram of an A2O-MBR integrated low-concentration organic wastewater treatment system according to an embodiment of the present invention.

Component numbers in the drawings of this utility model:

110 Anaerobic pool

120 Hydrolysis Acidification Tank

130 Contact oxidation tank

131 First contact oxidation unit

132 Second contact oxidation unit

140 MBR pool

150 disinfection pool

160 Equipment Room

161 fan

210 Sludge return mechanism

220 Water inlet and water distribution device

230 Water outlet overflow device

240 micropore aeration device

250 filler

Detailed ways

In the description of the present utility model, it should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification and are for those familiar with this technology to understand and understand. Reading is not intended to limit the implementability of this utility model, so it has no technical substantive significance. Any structural modifications, changes in proportions, or size adjustments will not affect the efficacy and effectiveness of this utility model. As long as the purpose can be achieved, it should still fall within the scope of the technical content disclosed in the present utility model. Also the terms "center", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top" The directions or positional relationships indicated by "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying. The devices or components must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, in the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

As shown in Figure 1, the utility model provides an A2O-MBR integrated low-concentration organic wastewater treatment system, including an anaerobic tank 110, a hydrolysis acidification tank 120, a contact oxidation tank 130, an MBR tank 140 and a disinfection tank 150 that are connected in sequence. ; The anaerobic tank 110, the hydrolysis acidification tank 120, and the contact oxidation tank 130 are respectively provided with fillers 250, and the MBR tank 140 is provided with a sludge return mechanism 210 between the anaerobic tank 110 and the contact oxidation tank 130, respectively. The anaerobic tank 110 and the contact oxidation tank 130 are respectively provided with a water inlet and distribution device 220; the hydrolysis and acidification tank 120 is provided with a water outlet overflow device 230. Among them, the A2O method, also known as the AAO method, is the abbreviation of the first letter of the English Anaerobic-Anoxic-Oxic (anaerobic-anoxic-aerobic method), and is a commonly used sewage treatment process. Wastewater treated by the A2O method alone is often difficult to operate stably because the system is difficult to operate stably, and the effluent COD and SS fluctuate greatly. Therefore, the produced water cannot stably meet the standards for reuse water. A2O-MBR integration is used, and the terminal adopts a combination of biochemical and physical chemistry. The process can not only further degrade COD through high-concentration sludge, but also further remove difficult-to-dissolve COD and SS in water through membrane filtration, ensuring stable effluent quality and providing stability for water reuse. protection.

In this embodiment, the anaerobic tank 110, the hydrolysis acidification tank 120, the contact oxidation tank 130, and the MBR tank 140 adopt push-flow water inlet to prevent short flow. The anaerobic tank 110 is an upper water inlet, the bottom of the anaerobic tank 110 is connected with the bottom of the hydrolysis acidification tank 120, the hydrolysis acidification tank 120 is an upper outlet, and the upper part of the hydrolysis acidification tank 120 is connected with the contact oxidation tank 130. In a specific embodiment, the contact oxidation tank 130 is provided with two compartments. The contact oxidation tank 130 includes a connected first contact oxidation unit 131 and a second contact oxidation unit 132. The top of the hydrolysis acidification tank 120 is connected to the first contact oxidation unit 132 . The top of the unit 131 is connected, the bottom of the first contact oxidation unit 131 is connected with the bottom of the second contact oxidation unit 132, and water is discharged from the top of the contact oxidation tank 130, that is, the top of the second contact oxidation unit 132 is connected with the top of the MBR tank 140, The bottom of the MBR pool 140 is connected to the disinfection pool 150. The water from the MBR pool 140 enters the disinfection pool 150. After the clean water is disinfected by ozone in the disinfection pool 150, it is collected and reused regularly for production. In this embodiment, the advantages of setting up the first contact oxidation unit 131 and the second contact oxidation unit 132 are: 1. The hydraulic retention time of the contact oxidation tank is increased, so that organic matter in the water can be further degraded; 2. The first contact oxidation unit The unit 131 is connected to the bottom of the second contact oxidation unit 132, and the second contact oxidation unit 132 and the MBR tank are top overflows. This can effectively control the sludge concentration of the MBR tank and improve the biochemical efficiency.

In this embodiment, the anaerobic tank 110, the hydrolysis acidification tank 120 and the contact oxidation tank 130 are all hung with fillers 250, and the fillers 250 are biological rope fillers. Filler 250 is made of a mixture of elastic materials and soft materials. The material is reinforced PP and modified alcoholized fiber. It can quickly film and improve the mass transfer effect, making the device more resistant to impact loads.

In this embodiment, the filling rate of the filler 250 in the anaerobic tank 110, the hydrolysis acidification tank 120, and the contact oxidation tank 130 can be, for example, 50%-80%, 50%-70%, or 70%-80% of the effective tank capacity. . Among them, the effective pool capacity refers to the actual volume of water that the pool can store. Because when designing a pool, there is often a worry that the pool will overflow when it is full, and a super height of 0.5m-1m will be designed. The volume of the pool is not the storage capacity under running conditions. The volume of water, the effective pool capacity is. Advantages: The filling rate of the filler 250 in the anaerobic tank 110, the hydrolysis acidification tank 120, and the contact oxidation tank 130 is 50%-80% of the effective tank volume, which increases the mass transfer effect of water and improves the treatment efficiency of the unit system. Not only can Saving the volume of the pool can also increase the impact load of the system.

In this embodiment, the hydrolysis and acidification tank 120 and the contact oxidation tank 130 are equipped with aeration and stirring devices at the bottom. The hydrolysis and acidification tank 120 uses PVC perforated pipes, and the contact oxidation tank 130 uses microporous aeration disks, and the material is ABS+EPDM. The aeration pipe is connected to the fan 161, and the fan 161 provides air (oxygen) into the pool. The fan 161 is installed in the equipment room 160.

In this embodiment, the anaerobic tank 110 and the contact oxidation tank 130 are respectively provided with a water inlet and water distribution device 220, and the water inlet and water distribution device 220 is a water distribution triangular weir.

In this embodiment, the hydrolysis and acidification tank 120 is provided with an outlet overflow device 230, and the outlet overflow device 230 is an overflow triangular weir.

In this embodiment, the load on the weir of the water distribution triangular weir and the overflow triangular weir is 1-2L/(m·s), 1-1.5L/(m·s), or 1.5-2L/(m· s), the advantage of this is that the water distribution and overflow are more uniform, and there will be no short flow.

In this embodiment, the MBR pool 140 is provided with an immersed MBR membrane, and the installed MBR membrane is made of PTFE. Specifically, the MBR membrane uses a hollow fiber membrane made of PTFE, with a membrane flux of 0.3m ³ /m ² ·d-0.5m ³ /m ² ·d. This can not only ensure the service life of the MBR membrane, but also meet the requirements of the system. Normal water production, saving equipment investment.

The MBR membrane is made of PTFE, which has the advantages of strong hydrophilicity and large flux. The MBR process is used at the end, which reduces the setting of the secondary sedimentation tank and saves equipment space. At the same time, a small amount of biological enzymes are added when the MBR tank 140 is running. , the iodine value of the added biological enzyme is 800. After adding the biological enzyme, the COD and chroma of the effluent from the MBR pool 140 have been further reduced.

In this embodiment, a sludge return mechanism 210 is provided between the MBR tank 140 and the contact oxidation tank 130. An airlift sludge return mechanism is used to realize the sludge return, and the sludge returns to the water inlet end of the contact oxidation tank 130. , used to replenish the sludge in the contact oxidation tank 130 .

In this embodiment, a sludge return mechanism 210 is used between the MBR tank 140 and the anaerobic tank 110 to return the remaining sludge to the anaerobic tank 110 for anaerobic digestion of the sludge. In a specific embodiment, the remaining sludge produced by the biochemical system is discharged to the water inlet end of the anaerobic tank 110 through an airlift sludge return mechanism, so that the sludge can be purified by anaerobic bacteria and facultative bacteria under anaerobic conditions. The biodegradable organic matter in the sludge is decomposed into CH ₄ , CO ₂ and H ₂ O, which reduces the sludge discharge of the device to basically zero and reduces operating costs.

In a specific embodiment, the sludge return mechanism 210 is connected to the water inlet end of the anaerobic tank 110, the water inlet end of the contact oxidation tank 130, and the water outlet end of the MBR tank 140 respectively.

In this embodiment, a control valve is provided on the pipeline from the sludge return mechanism 210 into the contact oxidation tank 130 to control whether the sludge returns to the contact oxidation tank 130 . A control valve is provided on the pipeline from the sludge return mechanism 210 into the water inlet end of the anaerobic tank 110 to control whether sludge enters the anaerobic tank.

In this embodiment, the disinfection used in the disinfection pool 150 is ozone disinfection.

The low-concentration organic wastewater treatment method using the low-concentration organic wastewater treatment system of the present invention is: sending the low-concentration organic wastewater into the water distribution weir provided in the anaerobic tank 110 through the water inlet pipe, and then the wastewater flows through the hydrolysis and acidification tank in sequence. 120. Contact oxidation tank 130, MBR tank 140 and disinfection tank 150. The sludge in the MBR tank 140 returns to the contact oxidation tank 130 through the sludge return mechanism. The remaining sludge in the MBR tank 140 is regularly discharged to the anaerobic tank 110. Perform anaerobic digestion.

The sludge return ratio from the sludge return mechanism to the contact oxidation tank is 50%. The sludge return ratio refers to the amount of sludge returned from the MBR tank to the contact oxidation tank, and is defined as the ratio of the return sludge amount to the incoming water amount. .

The sludge return mechanism returns the sludge to the anaerobic tank for digestion. The sludge discharge cycle is once a week, and the sludge discharge amount is 5% of the daily water inflow. The sludge is discharged regularly through the sludge return pipe, and the remaining sludge produced by the MBR is discharged to the inlet end of the anaerobic tank, so that the biodegradable sludge in the sludge can be removed by anaerobic and facultative bacteria under anaerobic conditions. Degraded organic matter decomposes into CH ₄ , CO ₂ and H ₂ O.

The amount of ozone added to the disinfection tank 150 is 5 mg/L, which sterilizes and removes odors in the water at the same time. Examples 1, 2, and 3 correspond to three sets of parallel experimental data using the above-mentioned sludge return ratio, sludge discharge period, and ozone amount.

Use the integrated treatment device of the above example to treat low-concentration organic wastewater, and then detect various indicators of the inlet and outlet water of the device. The test results are shown in the table below:

It can be seen from the data in the above table that after the low-concentration organic wastewater is treated by the A ² O-MBR integrated low-concentration organic wastewater treatment device, the effluent fully meets the process in "Industrial Water Quality for Urban Wastewater Recycling" (GB/T 19923-2005) With product water standards, it can be reused in production.

In summary, the A2O-MBR integrated low-concentration organic wastewater treatment system provided by the embodiment of the present utility model enables the integrated wastewater treatment device to completely purify pollutants in low-concentration organic wastewater, and the entire system does not require civil construction, and the equipment occupies a small area. , short construction period, low equipment investment and operating costs, simple operation and management, the equipment water can meet the process and product water standards in "Industrial Water Quality for Urban Wastewater Recycling" (GB/T 19923-2005), and can be fully recycled Production, truly achieve zero discharge of waste water.

In summary, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above embodiments are only illustrative of the principles and effects of the present invention, but are not intended to limit the present invention. Anyone familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (10)

1. An A2O-MBR integrated low-concentration organic wastewater treatment system, characterized by including an anaerobic tank (110), a hydrolysis acidification tank (120), a contact oxidation tank (130), and an MBR tank (140) connected in sequence and disinfection tank (150); the anaerobic tank (110), the hydrolysis acidification tank (120), and the contact oxidation tank (130) are respectively provided with fillers (250), and the MBR tank (140) is respectively connected with the anaerobic tank. (110) and the contact oxidation tank (130) are provided with a sludge return mechanism (210). The anaerobic tank (110) and the contact oxidation tank (130) are respectively provided with water inlet and water distribution devices (220), so The hydrolysis acidification tank (120) is provided with an outlet overflow device (230). 2. The A2O-MBR integrated low-concentration organic wastewater treatment system as claimed in claim 1, characterized in that the anaerobic tank (110) is an upper water inlet, and the bottom of the anaerobic tank (110) and the The bottom of the hydrolysis and acidification tank (120) is connected, the hydrolysis and acidification tank (120) is an upper outlet, and the top of the hydrolysis and acidification tank (120) is connected with the contact oxidation tank (130). 3. The A2O-MBR integrated low-concentration organic wastewater treatment system according to claim 2, characterized in that the contact oxidation tank (130) includes a connected first contact oxidation unit (131) and a second contact oxidation unit. (132), the top of the hydrolysis acidification tank (120) is connected to the top of the first contact oxidation unit (131), the bottom of the first contact oxidation unit (131) is connected to the bottom of the second contact oxidation unit (132), and the The top of the second contact oxidation unit (132) is connected to the top of the MBR tank (140), and the bottom of the MBR tank (140) is connected to the disinfection tank (150). 4. The A2O-MBR integrated low-concentration organic wastewater treatment system according to claim 1, characterized in that the sludge return mechanism (210) is connected to the water inlet end of the anaerobic tank (110) and the contact oxidation tank respectively. The water inlet end of (130) and the water outlet end of the MBR pool (140) are connected. 5. The A2O-MBR integrated low-concentration organic wastewater treatment system according to claim 1, characterized in that the filler (250) is a biological rope filler; And/or, the water inlet and water distribution device (220) is a water distribution triangular weir; And/or, the water outlet overflow device (230) is an overflow triangular weir. 6. The A2O-MBR integrated low-concentration organic wastewater treatment system as claimed in claim 1, characterized in that the filler (250) in the anaerobic tank (110), the hydrolysis acidification tank (120), and the contact oxidation tank (130) The filling rate is 50%-80% of the effective pool capacity. 7. The A2O-MBR integrated low-concentration organic wastewater treatment system as claimed in claim 5, characterized in that the load on the weir of the water distribution triangular weir and the overflow triangular weir is 1-2L/(m·s) . 8. The A2O-MBR integrated low-concentration organic wastewater treatment system as claimed in claim 1, characterized in that the sludge return ratio from the MBR tank (140) to the contact oxidation tank (130) is 30%-50 %. 9. The A2O-MBR integrated low-concentration organic wastewater treatment system as claimed in claim 1, characterized in that an immersed MBR membrane is provided in the MBR pool (140); And/or, the MBR membrane in the MBR tank (140) is a hollow fiber membrane made of PTFE, and the membrane flux is 0.3m ³ /m ² ·d-0.5m ³ /m ² ·d. 10. The A2O-MBR integrated low-concentration organic wastewater treatment system according to claim 1, characterized in that there is a microporous aeration device (240) in the contact oxidation tank (130), and the system also includes equipment Room (160), the equipment room (160) is equipped with a fan (161), and the fan (161) is connected with the microporous aeration device (240).