CN115057535A

CN115057535A - Organic sewage treatment device and treatment method

Info

Publication number: CN115057535A
Application number: CN202210979129.6A
Authority: CN
Inventors: 申司浩; 朱青青; 黄小玲
Original assignee: Shenzhen Tianyu Environmental Protection Technology Co ltd
Current assignee: Shenzhen Tianyu Environmental Protection Technology Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2022-09-16

Abstract

The application discloses a treatment device and a treatment method for organic sewage. When the treatment device is used for treating sewage, the sewage to be treated is pretreated by the micro-aeration unit, so that the water in the tank is in a micro-aerobic state, namely a semi-aerobic and semi-anaerobic state. In addition, because the biological filler modules are arranged in the pre-denitrification tank, the anaerobic tank, the anoxic tank, the aerobic tank, the biological filtering tank and other treatment tanks, the biological filler modules can be freely combined and installed according to the actual size and the volume of the treatment tanks, and the disassembly, assembly and replacement are convenient.

Description

Organic sewage treatment device and treatment method

Technical Field

The application relates to the technical field of sewage treatment, in particular to a treatment device and a treatment method for organic sewage.

Background

The low-concentration domestic sewage, such as domestic sewage in farmhouse, small manor and new countryside, is small in water amount, and conventionally adopts a biomembrane method or an activated sludge method such as an oxidation ditch, a CASS process, a contact oxidation method, an MBR (membrane bioreactor) and the like.

In the above related art, the treatment efficiency is low and the replacement and maintenance of the packing are troublesome.

Disclosure of Invention

In view of this, the present application provides an apparatus and a method for treating organic wastewater, which can improve the treatment efficiency and facilitate the replacement of the filler.

In a first aspect, the application provides a processing apparatus of organic sewage, include denitration pond, anaerobism pond, oxygen deficiency pond, good oxygen pond, sedimentation tank and biological filtration pond in advance that communicate in proper order according to sewage treatment order:

the biological filler module is formed by biological fillers filled in a frame, and the frame is configured to be freely and separately installed in the pre-denitrification tank, the anaerobic tank, the anoxic tank, the aerobic tank and the biological filter tank.

Optionally, the biological filler comprises a fixed biological rope filler layer positioned at a lower layer and a polyurethane filler layer positioned at an upper layer.

Optionally, the system further comprises a first backflow component for enabling part of the sewage of the aerobic tank to flow back to the large anoxic tank.

Optionally, the first reflux assembly is a stripping micropower reflux vessel.

Optionally, the system further comprises a second backflow assembly for making the sludge in the sedimentation tank flow back to the pre-denitrification tank and the aerobic tank.

Optionally, the second reflux assembly is a stripping micropower reflux vessel.

Optionally, a blower is further included to communicate with the micro-power reflux unit.

Optionally, the system further comprises a chemical phosphorus removal assembly communicated with at least the sedimentation tank.

According to the treatment device, when sewage is treated, the sewage to be treated is pretreated by the micro-aeration unit, so that the water in the tank is in a micro-aerobic state, namely a semi-aerobic and semi-anaerobic state, which is a method between aerobic and anaerobic treatment methods, a certain small molecular organic matters are simply pretreated, meanwhile, part of the organic matters are aminated, nitrate which flows back from the sedimentation tank is removed, COD in the water can be reduced, and other subsequent process combinations can be combined to reduce the treatment cost and improve the treatment efficiency.

In addition, because the biological filler modules are arranged in the pre-denitrification tank, the anaerobic tank, the anoxic tank, the aerobic tank, the biological filtering tank and other treatment tanks, the biological filler modules can be freely combined and installed according to the actual size and the volume of the treatment tanks, and the disassembly, assembly and replacement are convenient.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a process provided in an embodiment of the present application.

Wherein the elements in the figures are identified as follows:

11-a fan; 12-a regulating reservoir; 20-a pre-denitration pool; 30-an anaerobic tank; 40-anoxic pond; 50-an aerobic tank; 60-a sedimentation tank; 70-a biological filtration tank; 80-a disinfection tank; 90-chemical phosphorus removal component.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, the present application provides an apparatus for treating organic wastewater, which comprises a pre-denitrification tank 20, an anaerobic tank 30, an anoxic tank 40, an aerobic tank 50, a sedimentation tank 60 and a biological filtration tank 70, which are sequentially connected in order of wastewater treatment.

From the communication relationship of the treatment tanks, it can be understood that the treatment sequence of the sewage is as follows: firstly, the sewage to be treated can be treated according to actual requirements, such as primary filtration, enters the sewage collecting tank or the adjusting tank 12, is mixed and homogenized, then enters the pre-denitrification tank 20, and then is treated by the anaerobic tank 30, the anoxic tank 40, the aerobic tank 50, the sedimentation tank 60 and the biological filter tank 70 after priority.

It should be understood that the pre-denitrification tank 20 is used to micro-aerate the wastewater in the tank, i.e., in a micro-aerobic state, i.e., a semi-aerobic and semi-anaerobic state, which is a method between aerobic and anaerobic treatment methods, to simply pre-treat some small organic matters, and simultaneously ammonify a part of the organic matters to remove the nitrates returned from the sedimentation tank 60, and also to reduce the COD (COD is generally referred to as chemical Oxygen demand COD (chemical Oxygen demand) which is a chemical method for measuring the amount of reducing substances to be oxidized in the water sample), and other subsequent process combinations can reduce the treatment cost and improve the treatment efficiency. The main parameters of the micro-aeration unit are as follows: the hydraulic retention time is about 30min, water enters from the upper part and water exits from the bottom part. The effective contact time of the filler is about 0.5 h, the height of the filler layer is 1.8-2.1 m, the upper water depth of the filler is 0.2 m, the height of the filler is 0.2 m, and the total height of the area is controlled to be 2.3-2.6 m. The upper layer and the lower layer of the zone are different types of fixed modular biological fillers which are used as carriers of microorganisms, and the carriers with the microorganisms are submerged in water.

As an exemplary implementation of the pre-denitration tank 20, the processing related parameters are: the hydraulic retention time is about 30min, water enters from the upper part and water exits from the bottom part. The effective contact time of the filler is about 0.5 h, the height of the filler layer is 1.8-2.1 m, the upper water depth of the filler is 0.2 m, the height of the filler is 0.2 m, and the total height of the area is controlled to be 2.3-2.6 m.

It is known that the anaerobic tank 30 is hydrolyzed and acidified, and the hydrolysis and acidification process controls anaerobic treatment in the first and second stages of anaerobic treatment with short reaction time according to the difference of growth speeds of methanogens and hydrolysis acid-producing bacteria, i.e. the process of hydrolyzing insoluble organic matters into soluble organic matters under the action of a large amount of hydrolysis bacteria and acidification bacteria and converting macromolecular substances which are difficult to biodegrade into small molecular substances which are easy to biodegrade, thereby improving the biodegradability of wastewater and laying a good foundation for subsequent treatment.

As an exemplary implementation of the anaerobic tank 30, the process-related parameters are: the hydraulic retention time is about 30min, water enters from the bottom, and slowly rises through the filler microorganism layer, the rising speed is designed according to 4.2m/h, the effective contact time of the filler is about 0.5 h, the height of the filler layer is 1.8-2.1 m, the upper water depth of the filler is 0.2 m, the height of the filler is 0.2 m, and the total height of the area is controlled to be 2.3-2.6 m. The upper effluent flows to the facultative area automatically. The upper layer and the lower layer of the area are different in type of fixed modular biological fillers as carriers of microorganisms, the carriers with the microorganisms are submerged in water, the different types of biological fillers can inhabit different types of microorganisms, such as bacteria, vegetative flagellates and copepods, and mainly adhere to and live in the lower layer of the fillers, and sucker insects, sessile ciliates and rotifers adhere to and live in the upper layer of the fillers, so that different biochemical processes are formed, and different pollutants are efficiently reduced and removed.

As an exemplary implementation of the anoxic tank 40, the processing-related parameters are: the reflux ratio may be 1.5-2.5: 1. the hydraulic retention time is about 60min, the upper part of the unit is filled with water, and the water flows from the bottom of the unit to the aerobic zone after being treated by the filler microorganism layer. The effective contact time of the filler is 1h, the height of the filler layer is 1.8-2.1 m, the upper water depth of the filler is 0.2 m, the height of the filler is 0.2 m, and the total height of the area is controlled to be 2.3-2.6 m.

As an exemplary implementation of the aerobic tank 50, the treatment-related parameters are: the volume load of the filler is 1500gBOD according to 1000- ₅ /m ³ d; the effective contact time is 5h, the gas-water ratio is 15: 1, the height of a filler layer is 1.5-2.0 meters, the upper water depth of the filler is 0.2 meters, the height of the filler is 0.2 meters, and the total height of the area is controlled to be 2.3-2.6 meters.

In an exemplary embodiment, the treatment apparatus further comprises a first recirculation assembly for recirculating a portion of the wastewater from the aerobic tank 50 to the anoxic tank 40. Here, by the design of the first recirculation assembly, it is possible to supply oxygen contained in the sewage from the aerobic tank 50 to the anoxic tank 40, thereby avoiding separately providing the anoxic tank 40 with an oxygen supply apparatus.

As an exemplary implementation of the first reflux assembly, the first reflux assembly is a stripping micro-dynamic reflux device. The principle or basic construction of the stripping micropower reflux vessel is well within the skill of the art and is outlined herein.

Here, a blower 11 may be provided for the micro dynamic reflux unit to provide aeration air for the micro dynamic reflux unit. Of course, as a design consideration for saving the structure, the blower 11 may also be used for aerating the aerobic tank 50 or the pre-denitrification tank 20 at the same time.

As an exemplary implementation of the sedimentation tank 60, the processing-related parameters are: the retention time is about 1.5h, and the surface charge is 1.3m ³ /m ² H. And the supernatant after precipitation enters a biological filtering area at the rear end for deep biochemical filtering treatment, and the retention time is about 1 h. The method comprises the steps that a part of sludge containing strains flows back to a micro-aeration zone at the most front end, and a part of sludge flows back to an aerobic zone so as to improve the sludge load of a front-end treatment zone, and the measure is mainly that the activated sludge concentration monitored by activated sludge concentration monitors arranged in the micro-aeration zone and the aerobic zone controls the size of a backflow valve through a PLC (programmable logic controller) system so as to control the amount of the backflow activated sludge; micro aeration district and good oxygen district are equipped with the COD monitor respectively and pass through PLC autonomous system automatic control aeration rate with the dissolved oxygen monitor, promote oxygen utilization efficiency and microbial activity, promote sewage treatment capacity. And discharging the surplus sludge into a sludge tank, and periodically transporting the surplus sludge to the outside by a dung suction truck to be used as organic fertilizer for treatment. Clear water from the biological filtering area automatically flows to the ultraviolet sterilizer, and is discharged after reaching the standard after being sterilized and disinfected by ultraviolet rays. The system is highly automated, completely adopts biochemical technology and micro-power energy-saving technology, and the cost of water treatment per ton is only about 0.3 yuan, which is far lower than that of water treatment per ton by more than 0.5 yuan compared with the comparative technology.

Here, a second backflow assembly is further included to make the sludge of the sedimentation tank 60 flow back to the pre-denitrification tank 20 and the aerobic tank 50. Therefore, through the design of the second backflow component, the sludge load of the front-end treatment area can be increased, the sewage treatment capacity is improved, and surplus sludge is discharged into a sludge tank and is periodically transported and treated in a mode such as but not limited to a dung suction truck.

Here, the above-mentioned exemplary implementation as the second reflux assembly is a stripping micro-dynamic reflux device.

The principle or basic structure of the stripping micro-power reflux device can be seen in Chinese patent 'CNCN 202518820U, stripping device and sludge treatment system formed by the stripping device'.

Domestic sewage in farmyard, small manor, new countryside and other countries generally has small water amount, large site area, high investment cost, troublesome operation and easy generation of secondary pollution by using the conventional treatment method. The common domestic sewage treatment methods are more such as contact oxidation method, SBR method (SBR is short for sequencing batch activated sludge method, which is an activated sludge sewage treatment technology operated according to intermittent aeration mode), which is mainly characterized in that the operation is orderly and intermittently operated, the core of the SBR technology is an SBR reaction tank which integrates the functions of homogenization, primary sedimentation, biodegradation, secondary sedimentation and the like in one tank and is provided with a sludge backflow-free system, and the SBR sewage treatment method is particularly suitable for occasions with insufficient construction space and large intermittent discharge and flow change, an oxidation ditch and a CASS process (CASS process generally refers to a circulating activated sludge process, and the circulating activated sludge process is a novel sewage biological treatment process developed on the basis of the SBR technology, and the application of the method is a comprehensive sewage treatment collection measure and treatment process based on combining social development and advanced scientific technology, and has good working advantages in the work and wide application. ) And the like biofilm method or activated sludge method. The invention mainly adopts a combined process of anoxic nitrification, facultative nitrification, aerobic sedimentation, modular biofilter and ultraviolet light disinfection and is manufactured into integrated equipment. Mainly aims at the problems of small amount of domestic sewage in farmhouse, small manor and new countryside, low investment cost, convenient operation and management and no secondary pollution.

The pre-nitrification tank has been able to achieve biological phosphorus removal from the wastewater, and further includes a chemical phosphorus removal assembly 90 in communication with at least the sedimentation tank 60 based on further reducing the phosphorus content of the final purified water.

It should be understood that the chemical phosphorus removal assembly 90, in actual use, is formed by adding conventional chemical phosphorus removal agents to the settling pond 60.

In conjunction with the practical requirements of the application where sewage treatment is generally used, a disinfection tank 80, such as a uv disinfection tank 80, or other forms may be connected after the biological filtration tank 70.

The applicant creatively proposes that a bio-packing module is provided in the pre-denitrification tank 20, the anaerobic tank 30, the anoxic tank 40, the aerobic tank 50 and the bio-filtration tank 70, the bio-packing module is formed of a bio-packing packed in a frame configured to be freely detachably installed in the pre-denitrification tank 20, the anaerobic tank 30, the anoxic tank 40, the aerobic tank 50 and the bio-filtration tank 70.

The anaerobic tank 30 is internally provided with polyurethane biological filler, the anoxic tank 40 is filled with polyurethane facultative biological filler, the aerobic tank 50 consists of two layers of filler, the upper layer is polyurethane aerobic biological filler, the lower layer is modified fixed biological filler,

before working, the biological filler module is transplanted with strains, the fillers in the anaerobic tank 30, the anoxic tank 40 and the aerobic tank 50 are transplanted with comfort mud containing corresponding strains, and the mud obtained by comfort mud subjected to comfort treatment from mud containing corresponding strains in a sewage treatment plant is called as comfort mud. The relaxation has a strong conditioning effect, so that the materials are fully cured, the content of the strains reaches the peak value, the mud is subjected to strong spiral extrusion and shearing effects, a higher negative pressure condition is provided, the mud containing the strains is fully fluffy and soft and is in a micron cluster, and the mud can be well adsorbed and uniformly dispersed on the filler modules of the anaerobic tank 30, the anoxic tank 40 and the aerobic tank 50.

The chemical phosphorus removal assembly 90 may also be replaced by a biological filler module, for example, phosphorus-dissolving bacteria (also called phosphorus-dissolving bacteria, which is a microorganism having the ability to convert phosphorus that is difficult to be absorbed and utilized by plants into an absorbable and utilizable form) are planted on the biological filler module, and phosphorus is removed by a biological method to obtain an organic fertilizer containing phosphorus.

The sewage slowly flows to the aeration aerobic zone from the bottom, and because the microorganism in the aerobic zone is fixedly grown on the modularized biological filler, the defect that the suspended activated sludge is easy to lose is overcome, and high biomass can be kept in the reactor. The upper layer and the lower layer of the zone are different types of fixed modular biological fillers which are used as carriers of microorganisms, and the carriers with the microorganisms are submerged in water. The aerobic zone has the advantages of high volume load, short retention time, good organic matter removal effect, simple operation management, small occupied area and the like. The main parameters of the aerobic aeration oxidation zone are as follows: the volume load of the filler is 1500gBOD according to 1000- _5/ m ³ d; the effective contact time is 5h, the gas-water ratio is 15: 1, the height of a filler layer is 1.5-2.0 meters, the upper water depth of the filler is 0.2 meters, the height of the filler is 0.2 meters, and the total height of the area is controlled to be 2.3-2.6 meters.

From this, through the design of above-mentioned biofilm carrier module, can carry out the independent assortment installation according to handling pond actual size volume, made things convenient for the dismouting to change.

As an exemplary implementation manner of the biological filler, the biological filler comprises a fixed biological rope filler layer positioned at a lower layer and a polyurethane filler layer positioned at an upper layer.

The shape or configuration of the frame may be exemplified by a square frame formed by welding 304 stainless steel tubes. Detachable structures such as hooks or snap-in or screw-threaded openings may be provided on the frame, which will not be described in detail herein, and the detachable implementation structure is easily found by those skilled in the art in combination with general design capabilities.

The application provides a treatment method of organic sewage, which adopts the treatment device. The specific operation flow can be selected conventionally according to the actual sewage consumption and the like, and is not described in detail herein.

The processing device has the following advantages:

1. the full automated design, easy operation is convenient, saves the human cost of artifical control.

2. The operation is stable, the energy-saving design is adopted, only phosphorus removal and chemical addition are needed, and the operation cost is low.

3. With modular structural design, conveniently remove the transportation, only need external water pipe can handle sewage, but the reutilization, operation safe convenient and reliable.

4. The fan adopts a submerged fan, basically has no sound, cannot cause noise, and can not cause secondary pollution because the final products of the thorough treatment are nitrogen, carbon dioxide, water and the like.

5. Is suitable for treating most organic wastewater with small domestic sewage quantity or small water quantity and low concentration.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application.

Claims

1. The utility model provides a processing apparatus of organic sewage, its characterized in that includes denitration pond, anaerobism pond, oxygen deficiency pond, good oxygen pond, sedimentation tank and the biological filtration pond in advance that communicates in proper order according to sewage treatment order:

2. The apparatus for treating organic sewage according to claim 1, wherein the bio-packing comprises a fixed bio-rope packing layer at a lower layer and a polyurethane packing layer at an upper layer.

3. The apparatus for treating organic wastewater according to claim 1, further comprising a first reflux assembly for refluxing a portion of wastewater from the aerobic tank to the anoxic tank.

4. The apparatus of claim 3, wherein the first recirculation assembly is a stripping micro-power recirculation device.

5. The apparatus for treating organic wastewater according to claim 1, further comprising a second reflux assembly for refluxing sludge in the sedimentation tank to the pre-denitrification tank and the aerobic tank.

6. The apparatus of claim 5, wherein the second reflux assembly is a stripping micropower reflux unit.

7. The apparatus for treating organic wastewater according to claim 4 or 6, further comprising a blower in communication with the micro-power reflux unit.

8. The apparatus for treating organic wastewater according to claim 1, further comprising a chemical phosphorus removal module in communication with at least the settling tank.

9. A method for treating organic sewage, characterized in that the organic sewage is treated by the treatment apparatus according to claim 1.