CN113060901A

CN113060901A - A process and device for village sewage treatment

Info

Publication number: CN113060901A
Application number: CN202110306878.8A
Authority: CN
Inventors: 熊鹰扬
Original assignee: Jiangxi Green Shield Environmental Engineering Co ltd
Current assignee: Jiangxi Green Shield Environmental Engineering Co ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-07-02

Abstract

The invention relates to the technical field of sewage treatment, in particular to a village sewage treatment process and device, including pretreatment of domestic sewage firstly removing large floating objects through coarse and fine gratings, and removing fine inorganic particles in water by a cyclone desander; The total phosphorus in the water is removed by dosing and precision filtration; the wastewater after phosphorus removal enters the ozone-MBR system to achieve deep removal of COD, ammonia nitrogen and total nitrogen; the MBR produced water is sterilized by the disinfection unit and then discharged or reused. Part of the MBR mixed solution utilizes ozone oxidation to dissolve the microbial cytoplasm of the sludge, providing a carbon source for denitrification and achieving sludge reduction at the same time. The grating slag produced by the coarse and fine gratings is regularly collected and transported to the garbage station; the sand-containing concentrated water produced by the cyclone desander flows into the sand filter bed for dehydration, and is cleaned regularly, which can be used for comprehensive utilization such as road paving; in the chemical phosphorus removal unit The concentrated water of the precision filter flows into the sand filter bed for dehydration. The device includes: pretreatment unit, chemical phosphorus removal unit, ozone-MBR unit and disinfection unit and other process units.

Description

Process and device for treating sewage in villages and towns

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a village and town sewage treatment process and device.

Background

In China, with the promotion of new rural construction and the gradual improvement of the living standard of village and town residents, the discharge amount of domestic sewage in villages and towns is increased day by day. However, the facility construction of the village and town sewage treatment system seriously lags the direct discharge of the countryside sewage into the water body without treatment, which causes serious water environment pollution and increased black and odorous water body phenomena, thereby not only threatening the physical health of residents, but also hindering the ecological civilized construction of the villages and towns in China. The village and town sewage has the characteristics of small scale, wide surface, dispersion, large change of water quality and water quantity and the like.

At present, common village and town sewage treatment processes include a biofilm process represented by multi-stage biological contact oxidation, a biological rotating disc and the like, an ecological treatment process represented by an artificial wetland, an MBR process and the like. However, the amount of silt in sewage is large due to the imperfect pipe ditches of the sewage pipe network of the villages and small towns, the sludge production amount of the sewage treatment system is increased, the sludge causes accumulation and blockage of the sludge of the sewage treatment system, the maintenance requirement is high, and the normal operation rate of the sewage treatment system is low. As the pollutant discharge standard of urban sewage treatment plants (GB 18918-2002) primary A is equivalent to poor class V water of surface water, in order to prevent the water quality deterioration of a water body, partial or all indexes of the water outlet of the sewage treatment plants are improved to the class IV or class III standard of the environmental quality standard of surface water (GB 3838-2002), and the traditional treatment process meets the requirement of water quality upgrading.

Based on the problems of the existing village and town sewage treatment, the invention provides a village and town sewage treatment process and device. Can solve the problems of sludge accumulation and blockage and meet the requirement that the effluent index of a treatment plant reaches the IV or III standard of the environmental quality Standard of surface Water (GB 3838-2002).

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides extrusion molding equipment for producing plastic pipes, which overcomes the defects of the prior art, has simple structural design, effectively solves the problems of sludge accumulation and blockage, and meets the problem that the effluent index of a treatment plant reaches the requirements of the IV-type and even III-type standards of the environmental quality standard of surface water (GB 3838-2002).

In order to solve the technical problems, the invention provides the following technical scheme:

a process and apparatus for treating sewage in villages and towns includes such steps as removing large floaters from domestic sewage by coarse and fine grids, and removing fine inorganic particles from sewage by cyclone sand remover; then adding medicine and carrying out precise filtration to remove total phosphorus in the water; the wastewater after dephosphorization enters an ozone-MBR system to realize deep removal of COD, ammonia nitrogen and total nitrogen; and the MBR produced water is disinfected by the disinfection unit and then discharged or recycled. Grid slag generated by the coarse and fine grids is periodically collected and transported to a garbage station; the sand-containing concentrated water generated by the cyclone desander flows into a sand filter bed for dehydration and is cleaned regularly, so that the sand-containing concentrated water can be comprehensively utilized in paving and other modes; concentrated water of a precision filter in the chemical phosphorus removal unit flows into a sand filter bed for dehydration, and is collected and comprehensively utilized at regular intervals. Partial mixed liquid of the MBR is refluxed by a centrifugal pump, ozone gas is sucked by a jet aerator and fully reacted in an ozone reactor to realize the cytoplasm dissolution of sludge microorganisms, provide a carbon source for denitrification and simultaneously realize sludge reduction, and the zero emission of biochemical sludge is realized by the synergistic action of the MBR and the ozone "

As a preferred technical scheme of the invention, the device comprises a pretreatment unit, a chemical phosphorus removal unit, an ozone-MBR unit, a disinfection unit and other process units. The pretreatment unit comprises a coarse grating, a fine grating, a cyclone desander and a sand filter bed; the chemical phosphorus removal unit comprises a chemical phosphorus removal reactor, a precision filter and a sand filter bed; the ozone-MBR unit comprises a pre-aeration tank, an AO + MBR membrane tank and an ozone oxidation reaction tank; the disinfection unit comprises ozone aeration, an ultraviolet lamp and the like.

As a preferable technical scheme of the invention, the coarse and fine treatment device comprises one or more combined units of a screen, a cyclone sand removal device and the like.

As a preferred technical scheme of the invention, the sand filtration and dehydration device comprises a sand filtration and dehydration device, the sand filtration and dehydration device is divided into two or more grids, a concentrated water discharge port of the cyclone and the self-cleaning filter is connected with the sand filtration and dehydration device, and a water outlet of the sand filtration and dehydration device is connected with a grid well.

As a preferred technical scheme of the invention, the chemical phosphorus removal unit sequentially comprises a chemical phosphorus removal reaction tank, a precision filter, a phosphorus removal medicament dispensing and adding device, a dispensing barrel, a stirrer and a dosing metering pump.

As a preferred technical scheme of the invention, the sand filtration and dehydration device is divided into two or more grids, the concentrated water discharge port of the precision filter is connected with the sand filtration and dehydration device, and the water outlet of the sand filtration and dehydration device is connected with the grid well.

As a preferred technical scheme of the invention, the device comprises an adjusting tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a water production tank, an ozone generator and a sludge ozone oxidation tank. The mixed liquid in the MBR membrane tank flows back in two ways, wherein one way flows back to the anoxic tank, and the other way flows back to the ozone oxidation tank, the regulating tank and the anoxic tank in sequence.

As a preferable technical scheme of the invention, the system comprises a compressed air system, an ozone generator, an ozone oxidation reactor, a sludge reflux pump, an ejector and the like.

As a preferable technical scheme of the invention, the disinfection reaction tank adopts ozone disinfection or ozone-ultraviolet combined disinfection.

Further, the grid slag is periodically collected and sent to a garbage station, the sand-containing concentrated water generated by cyclone sand removal is filtered and dehydrated through a sand filter bed, and the phosphorus-containing concentrated water is filtered and dehydrated through the sand filter bed.

Further, a pretreatment and chemical phosphorus removal unit removes inorganic suspended matters and total phosphorus

The embodiment of the invention provides a village and town sewage treatment process and a device, which have the following beneficial effects:

1. the pretreatment and the chemical phosphorus removal realize the classification treatment and utilization of the grid slag, the silt and the phosphorus-containing sludge.

2. The sludge microbial cytoplasm is dissolved out by the partial mixed liquid of the MBR through ozone oxidation, a carbon source is provided for denitrification, sludge reduction is realized, and zero emission of biochemical sludge is realized by utilizing the synergistic effect of the MBR and ozone "

3. Realizing the advanced treatment of wastewater, and realizing IV-type or even III-type standards in the quality standard of surface water environment (GB 3838-2002).

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a process flow:

FIG. 2 is a schematic view of a sand filter bed:

FIG. 3 top view of an ozone-MBR-disinfection integrated reactor:

figure 4 side view of an ozone-MBR-disinfection integrated reactor.

In the figure: 1. the device comprises a pretreatment unit, 11, a coarse and fine grid, 12, a cyclone sand remover, 13, a sand filter bed, 2, a chemical phosphorus removal unit, 21, a chemical phosphorus removal reactor, 22, a precision filter, 23, a sand filter bed, 3, an ozone-MBR unit, 31, a preaeration tank, 32, AO + MBR membrane tanks, 33, an ozone oxidation reaction tank, 4, a (clean water tank) disinfection unit, 131, a sand filter bed body, 132, a sand filter bed water collecting channel, 133, a pebble layer, 134, a gravel layer, 135, a fine sand layer, 136, a filter sand layer, 137, a water distribution layer, 321, an anoxic tank, 322, an aerobic tank, 323, an MBR membrane tank, 324, a plant room, 325, an aeration system, 331 and an ozone generator.

Detailed Description

The objects, features and advantages of the present invention will be described more fully hereinafter with reference to the accompanying drawings and examples. The described embodiments are only some, but not all embodiments of the invention. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.

Example (b): as shown in fig. 1-3, a process and an apparatus for treating sewage in villages and small towns comprise a pretreatment unit 1, a chemical phosphorus removal unit 2, an ozone-MBR unit 3, a disinfection unit 4 and other process units. The pretreatment unit 1 comprises a coarse grating 11, a fine grating 11, a cyclone desander 12 and a sand filter bed 13; the chemical phosphorus removal unit 2 comprises a chemical phosphorus removal reactor 21, a precision filter 22 and a sand filter bed 23; the ozone-MBR unit 3 comprises a pre-aeration tank 31, an AO + MBR membrane tank 32 and an ozone oxidation reaction tank 33; the disinfection unit 4 comprises ozone aeration, an ultraviolet lamp and the like.

The domestic sewage is pretreated by removing large floaters through a coarse grating 11 and a fine grating 11, removing fine inorganic particles in the water through a cyclone desander 12 and the like; then, adding 21 chemicals and 22 precision filtration to remove the total phosphorus in the water; the wastewater after dephosphorization enters an ozone-MBR system 4 to realize deep removal of COD, ammonia nitrogen and total nitrogen; MBR produced water is discharged or recycled after being disinfected by the disinfection unit 4. Grid slag generated by the coarse and fine grids 11 is periodically collected and transported to a garbage station; the sand-containing concentrated water generated by the cyclone desander 12 flows into a sand filter bed 13 for dehydration and is cleaned regularly, so that the sand-containing concentrated water can be comprehensively utilized in paving and other modes; concentrated water of a precision filter 22 in the chemical phosphorus removal unit 2 flows into a sand filter bed 23 for dehydration and is periodically collected for comprehensive utilization. Partial mixed liquid of the MBR is refluxed by a centrifugal pump, ozone gas is sucked by a jet aerator and fully reacted in an ozone reactor to realize the cytoplasm dissolution of sludge microorganisms, provide a carbon source for denitrification and simultaneously realize sludge reduction, and the zero emission of biochemical sludge is realized by the synergistic action of the MBR and the ozone "

Compared with the prior art, the invention realizes the classification treatment or utilization of the grid slag, the silt and the phosphorus-containing sludge by pretreatment and chemical phosphorus removal, and reduces the inorganic sludge amount of a biochemical treatment unit; the sludge microbial cytoplasm is dissolved out by the partial mixed liquid of the MBR through ozone oxidation, a carbon source is provided for denitrification, sludge reduction is realized, the problem of insufficient carbon source is solved by utilizing the synergistic effect of the MBR and ozone, the denitrification effect is improved, and zero discharge of biochemical sludge is realized "

In some embodiments, the pre-processing unit comprises in sequence: coarse and fine, grating, cyclone sand removal, self-cleaning filter, etc.

In some embodiments, the disinfection unit adopts a combined disinfection mode of ozone and ultraviolet.

In some embodiments, a dissolved air pump is used for refluxing the mixed liquid and adding ozone gas; or dissolving ozone gas into the produced water by using a dissolved air pump or a centrifugal pump and an ejector to form ozone water, and oxidizing the sludge by using the ozone. The working principle is as follows: the domestic sewage is pretreated by removing large floaters through a coarse grating 11 and a fine grating 11, removing fine inorganic particles in the water through a cyclone desander 12 and the like; then, adding 21 chemicals and 22 precision filtration to remove the total phosphorus in the water; the wastewater after dephosphorization enters an ozone-MBR system 4 to realize deep removal of COD, ammonia nitrogen and total nitrogen; MBR produced water is discharged or recycled after being disinfected by the disinfection unit 4. Grid slag generated by the coarse and fine grids 11 is periodically collected and transported to a garbage station; the sand-containing concentrated water generated by the cyclone desander 12 flows into a sand filter bed 13 for dehydration and is cleaned regularly, so that the sand-containing concentrated water can be comprehensively utilized in paving and other modes; concentrated water of a precision filter 22 in the chemical phosphorus removal unit 2 flows into a sand filter bed 23 for dehydration and is periodically collected for comprehensive utilization. And partial mixed liquor of the MBR is refluxed by a centrifugal pump, ozone gas is sucked by a jet aerator and fully reacts in the ozone reactor to realize the cytoplasm digestion of sludge microorganisms, provide a carbon source for denitrification, realize sludge reduction and realize zero discharge of biochemical sludge by utilizing the synergistic effect of the MBR and the ozone.

Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a technology and device for treating sewage in villages and towns, comprising, it is characterized in that, described domestic sewage first removes bulk floating matter by thick and fine grids, and cyclone desander removes the pretreatments such as fine inorganic particles in water; Removal of total phosphorus in water through dosing and precision filtration; wastewater after phosphorus removal enters the ozone-MBR system to achieve deep removal of COD, ammonia nitrogen and total nitrogen; MBR produced water is discharged or reused after disinfection by the disinfection unit; coarse and fine grids The grid slag produced by the grid is collected and transported to the garbage station on a regular basis; the sand-containing concentrated water generated by the cyclone desander flows into the sand filter bed for dehydration, and is cleaned regularly, which can be used for comprehensive utilization such as road paving; The water flows into the sand filter bed for dehydration, and is collected regularly for comprehensive utilization; part of the MBR mixed liquid is refluxed by a centrifugal pump, and the ozone gas is inhaled through the jet aerator, and fully reacted in the ozone reactor to realize the dissolution of sludge microbial cytoplasm and provide carbon for denitrification. At the same time, sludge reduction can be achieved, and the synergistic effect of MBR and ozone can be used to achieve "zero discharge" of biochemical sludge.

2. the process and device of village sewage treatment according to claim 1, is characterized in that, the process units such as described pretreatment unit, chemical phosphorus removal unit, ozone-MBR unit and disinfection unit; Pretreatment unit comprises thick, fine Grille, cyclone desander, sand filter bed; chemical phosphorus removal unit includes chemical phosphorus removal reactor plus, precision filter, sand filter bed; ozone-MBR unit includes pre-aeration tank, AO+MBR membrane tank, ozone Oxidation reaction tank; disinfection unit includes ozone aeration and ultraviolet lamps, etc.; the front end of the grid pool is connected to the water inlet pipe (connected to the ditch), and the rear end of the grid pool is connected to the cyclone desander through a lift pump and a water pipe, and the desander is connected to the cyclone desander in turn. The chemical phosphorus removal reactor, precision filter, and ozone-MBR unit's pre-aeration tank, anoxic tank, aerobic tank, MBR membrane tank and disinfection tank (water production tank) are connected.

3. The process and device of village sewage treatment according to claim 1 and 2, characterized in that, the pretreatment unit further comprises a silt sand filter dewatering device, and the sand filter dewatering device is divided into two or more, The cyclone and the concentrated water outlet of the self-cleaning filter are connected with the sand filter dehydration device, and the water outlet of the sand filter dehydration device is connected with the grid well.

4. The process and device of village sewage treatment according to claim 1 and 2, wherein the chemical phosphorus removal unit comprises a static mixer, a reactor, a precision filter, a dispensing barrel, a stirrer, a Medicine metering pump.

5. the technology and the device of village sewage treatment according to claim 1,2, it is characterized in that, described ozone+MBR unit, MBR membrane tank mixed liquid is divided into two-way backflow, wherein one is backflow to anoxic pond, and the other Return to the ozone oxidation tank, pre-aeration tank, and anoxic tank in turn.

6. The technology and device of village sewage treatment according to claim 5, it is characterized in that, described ozone+MBR unit, also comprises compressed air system, ozone generator, ozone oxidation reactor, sludge return pump, ejector Wait.

7. The process and device for village sewage treatment according to claim 1, 2, characterized in that, the disinfection unit comprises a disinfection reaction tank (water production tank), and adopts ozone disinfection or ozone-ultraviolet combined disinfection.