CN112607977B

CN112607977B - Double-sludge dephosphorization and denitrification device and process suitable for plateau domestic sewage treatment

Info

Publication number: CN112607977B
Application number: CN202011609692.1A
Authority: CN
Inventors: 刘露雨
Original assignee: Guangdong Jinfan Environmental Protection Technology Co ltd
Current assignee: Guangdong Jinfan Environmental Protection Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-11-11
Anticipated expiration: 2040-12-30
Also published as: CN112607977A

Abstract

The invention discloses a double-sludge phosphorus and nitrogen removal device and a double-sludge phosphorus and nitrogen removal process suitable for plateau domestic sewage treatment, which belong to the technical field of sewage treatment.

Description

Double-sludge dephosphorization and denitrification device and process suitable for plateau domestic sewage treatment

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a double-sludge dephosphorization and denitrification device and a double-sludge dephosphorization and denitrification process suitable for plateau domestic sewage treatment.

Background

The social status and the natural status of Tibet plateau at Tibet are of little importance, and have considerable influence on the harmonious stability and the concurrent development of national and international societies. In recent years, the environmental protection problem in the Tibet area is more and more prominent due to economic development and regional development, and urban domestic sewage gradually shows the trend of increasing the water discharge and decreasing the COD/N and COD/P ratio.

The urban domestic sewage treatment work is still in a starting stage, the low-temperature, low-pressure and low-oxygen conditions have great influence on the activity of microorganisms, the aeration efficiency and the like, the operation efficiency of the traditional activated sludge/biological membrane process is limited, and the establishment and the operation of a sewage plant are greatly hindered. The traditional phosphorus and nitrogen removal process belongs to a single sludge system, phosphorus accumulating bacteria and denitrifying bacteria compete for a carbon source in sewage, and later, people find that part of the phosphorus accumulating bacteria in the activated sludge system can take up phosphorus in a solution while denitrifying by taking nitrate as an electron acceptor under an anoxic condition in the research process of biological nitrogen and phosphorus removal. Based on the theory of denitrifying phosphorus removal, the double-sludge phosphorus and nitrogen removal process is developed gradually and completely, two sets of sludge reflux systems are arranged, namely nitrifying sludge and denitrifying phosphorus and phosphorus removal sludge, and living environments suitable for nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria are respectively constructed. However, the common double-sludge dephosphorization and denitrification process has certain defects: on one hand, a plurality of reflux systems exist in the process flow, and the operation is complicated; on the other hand, in the prior art, the filler is not easy to form a membrane, is easy to fall off and is easy to sink after membrane formation, so that the contact surface between sewage and membrane-forming strains is limited, and the sewage denitrification and dephosphorization effect is poor.

Therefore, a double-sludge dephosphorizing and denitrifying device and a double-sludge dephosphorizing and denitrifying process suitable for treating the plateau domestic sewage are provided to effectively solve the problems in the prior art.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a double-sludge phosphorus and nitrogen removal device and a double-sludge phosphorus and nitrogen removal process suitable for plateau domestic sewage treatment, wherein sludge led out from a sedimentation tank flows back to a low-oxygen microbial pool and an anaerobic pool to complete the double-sludge phosphorus and nitrogen removal process combining a biofilm method and an activated sludge method, biofilm-forming bacteria (denitrifying bacteria) on the low-oxygen microbial pool compete with activated sludge for organic substances and nitrate substances in water to complete denitrification reaction, the content of organic carbon sources in an aerobic microbial pool is low, the growth of the biofilm-forming bacteria (nitrifying bacteria) is facilitated, the nitrification reaction is completed, the separation and survival of denitrifying bacteria, phosphorus accumulating bacteria and nitrifying bacteria can be realized by using double-return of one sludge, the contradiction of survival of all bacteria is effectively avoided, in addition, the biofilm-forming bacteria are suspended in laminated biofilm-forming exocarriers, the bacteria are not easy to fall off, and the sewage flows through a plurality of biofilm-forming exocarriers, the contact surface of the sewage and the biofilm-forming bacteria is enlarged, and the phosphorus removal effect is effectively improved.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

Two mud dephosphorization denitrification facility suitable for plateau domestic sewage handles, including low oxygen microbial pool, anaerobism pond, aerobic microbial pool and sedimentation tank, the top in low oxygen microbial pool is linked together through inlet tube and sewage source, the export in low oxygen microbial pool is connected with the import in anaerobism pond through first discharge tube, the export in anaerobism pond is connected with the import in aerobic microbial pool through the second discharge tube, the export in aerobic microbial pool is connected with the import in sedimentation tank through the third discharge tube, the export in sedimentation tank is connected with the top inside in anaerobism pond, low oxygen microbial pool, the top in low oxygen microbial pool and aerobic microbial pool all are equipped with reposition of redundant personnel platform, two the bottom of reposition of redundant personnel platform all is equipped with range upon range of outer carrier of hanging that sets up, and is two sets of all install carrier in the carrier of hanging membrane, be located two sets of distribute on the carrier of hanging membrane carrier and be equipped with and hang the membrana strain, all inlay in low oxygen microbial pool and the anaerobism microbial pool and establish to install and to distribute and to hang the aeration pipe in the membrane outer carrier.

Further, it is two sets of reposition of redundant personnel platform is including difference fixed connection in the inside shunt tubes in low oxygen microorganism pond, anaerobism pond top, set up a plurality ofly on the shunt tubes and hang the inside overflow mouth that communicates of outer carrier of membrane, a plurality of overflow mouths are linked together with the entry of hanging the membrane chamber respectively for play the reposition of redundant personnel effect to leading-in sewage.

Furthermore, the membrane hanging external carrier comprises a plurality of V-shaped external membrane plates which are stacked up and down, a membrane hanging cavity is formed in each V-shaped external membrane plate, a plurality of flow openings are formed in the bottoms of the V-shaped external membrane plates, the V-shaped external membrane plates are vertically adjacent to each other and are arranged in a staggered mode, the flow openings in the upper V-shaped external membrane plates are communicated with membrane hanging cavity inlets in the lower V-shaped external membrane plates, the membrane hanging cavities are of V-shaped structures, two sides of the top ends of the membrane hanging cavities are communicated with overflow openings respectively, sewage is injected inwards through two sides of the top ends of the membrane hanging cavities, the sewage is effectively in full contact with membrane hanging strains in the interior of the membrane hanging cavities, and the sewage is filled with the interior of the membrane hanging cavities distributed up and down from the top.

Furthermore, the inner walls of the low-oxygen microorganism pool and the aerobic microorganism pool are embedded with limiting platforms for limiting the V-shaped externally-hung membrane plates at the bottom ends, and the overflow ports are respectively connected with the inlets of the membrane hanging cavities corresponding to the positions of the overflow ports.

Further, the carrier is including fixed linking in the hanging membrane pole of hanging the inside both sides in membrane hanging chamber in the hanging membrane, it has a plurality of arc interior hanging membranous plates to hang membrane pole last fixed distribution, hanging membrane plate and hanging membrane pole linking department in the arc is equipped with fixed bag, the last lower terminal surface of hanging membrane plate has a plurality of fibre fine hair of evenly distributing in the arc, and the carrier is the arc structure in the hanging membrane, and what the carrier was hung all around in the hanging membrane offsets with hanging membrane intracavity wall respectively, hangs and establishes on the membrane hanging plate in the arc, is difficult for dropping from hanging the carrier in the membrane, and being provided with of fibre fine hair has done benefit to and has increased the bacterial and has hung and establish thickness.

Furthermore, the arc-shaped inner biofilm culturing plate is made of porous ceramic materials, the upper end face and the lower end face of each porous ceramic material are respectively coated with a layer of fiber woven suspension net, and the porous ceramic materials and the fiber materials of the fiber woven suspension nets are all suitable for suspension of biofilm culturing strains.

Further, the heater strip is installed to the inside of the outer hanging lamina membranacea of V-arrangement inlays to establish, the heater strip is connected with the interior hanging lamina membranacea of a plurality of arcs, the hanging lamina membranacea adopts the fibre to weave the lacing film and adopts weak heat conduction type flexible material, to the high temperature environment, utilizes the heater strip to heat the outer carrier department of hanging membrane, and the heat transmits to hanging membrane bacterial department through hanging lamina membranacea in the arc, and the environment that hanging membrane bacterial grows has effectively been optimized to the weak heat conduction of hanging lamina membranacea in the arc, can adapt to the change of the difference in temperature round the clock on the plateau better.

Furthermore, all seted up a plurality of aeration holes on hanging the top both sides wall in membrane chamber, it is a plurality of the aeration pipe inlays respectively and locates the top middle part position of the external lamina membranacea of V-arrangement, all sets up a plurality of aeration pipes in low-oxygen microorganism pond and the aerobic microorganism pond, and the technical staff can come to carry out accuse oxygen volume input through the aeration pipe according to required oxygen content in actual low-oxygen microorganism pond and the aerobic microorganism pond.

Further, the inside fixedly connected with filter of sedimentation tank, the top of filter and the corresponding setting of bottom position of third discharge tube, the filter forms the mud with sedimentation tank inside and sinks the district, the filter forms the supernatant with sedimentation tank's top and filters out the district, sedimentation tank's the bottom outside is equipped with the fluid-discharge tube that filters out the district with the supernatant and is linked together, and the technical staff can set up in the top portion that mud sinks the district and stir the structure for the separation of muddy water.

The double-sludge dephosphorization and denitrification process suitable for the plateau domestic sewage treatment device comprises the following steps:

s1, sewage is guided into a low-oxygen microorganism tank through a water inlet pipe and respectively flows into a plurality of film hanging cavities on a plurality of V-shaped external film plates through a plurality of overflow ports on a shunt pipe, denitrifying bacteria are hung in the film hanging cavities, and the sewage stays for 1-1.5 hours in the low-oxygen microorganism tank to realize the denitrifying reaction of the sewage;

s2, introducing the sewage flowing through the low-oxygen microorganism pool into an anaerobic pool, wherein phosphorus-accumulating bacteria microorganisms are arranged in the anaerobic pool, the phosphorus-accumulating bacteria microorganisms in the activated sludge release phosphorus in an anaerobic manner, and simultaneously absorb organic matters in the water to provide energy for absorbing a large amount of phosphorus in a later aerobic state, and the sewage stays in the anaerobic pool for 0.4-0.5h;

s3, pumping the sewage treated by the anaerobic tank into an aerobic microbial tank through a second drainage pipe, and shunting the sewage into film hanging cavities in a plurality of V-shaped external film plates through a plurality of overflow ports in the aerobic microbial tank, wherein digestive bacteria are hung in the film hanging cavities at the aerobic microbial tank, so that residual ammonia nitrogen and nitrate nitrogen are removed;

and S4, finally, introducing the sewage treated by the aerobic microbial pool into a sedimentation tank, precipitating sludge in a sludge settling zone, filtering supernatant by a filter plate and discharging the supernatant from a liquid discharge pipe, introducing the settled sludge into the anaerobic tank and the inner low-oxygen microbial pool again through a sludge return pipe, and removing phosphorus from the activated sludge in the anaerobic tank.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) The scheme is that sludge led out from a sedimentation tank flows back to a low-oxygen microbial pool and an anaerobic pool to finish a double-sludge dephosphorization and denitrification process combining a biofilm method and an activated sludge method, biofilm-forming bacteria (denitrifying bacteria) on the low-oxygen microbial pool compete with activated sludge for organic substances and nitrate substances in water to finish denitrification reaction, the content of organic carbon sources in the aerobic microbial pool is low, the growth of the biofilm-forming bacteria (nitrifying bacteria) is facilitated, the nitrification reaction is finished, the separated survival of denitrifying bacteria, phosphorus accumulating bacteria and nitrifying bacteria can be realized by utilizing the double-backflow of the sludge, the survival contradiction of all bacteria is effectively avoided, in addition, the biofilm-forming bacteria are hung in a laminated biofilm-forming outer carrier, the bacteria are not easy to fall off, and the sewage flows through a plurality of biofilm-forming outer carriers, so that the contact surface between the sewage and the biofilm-forming bacteria is enlarged, and the denitrification and denitrification effects are effectively improved.

(2) Two sets of reposition of redundant personnel platforms are including respectively fixed connection in the inside shunt tubes in low oxygen microorganism pond, anaerobism pond top, set up a plurality ofly on the shunt tubes and hang the inside overflow mouth that communicates of membrane outer carrier, and a plurality of overflow mouths are linked together with the entry of hanging the membrane chamber respectively for play the reposition of redundant personnel guide effect to leading-in sewage.

(3) The outer carrier of biofilm formation includes a plurality of V-arrangement external diaphragm plates that range upon range of distribution from top to bottom, the biofilm formation chamber has all been seted up to a plurality of V-arrangement external diaphragm plate insides, circulation opening has all been seted up to a plurality of V-arrangement external diaphragm plate bottoms, the crisscross setting of the V-arrangement external diaphragm plate of adjacent from top to bottom, and the circulation opening on the V-arrangement external diaphragm plate that is located the top is linked together with the biofilm formation chamber entry on the V-arrangement external diaphragm plate of below, the biofilm formation chamber is V type structure, the top both sides in biofilm formation chamber are linked together with the overflow mouth respectively, sewage pours into through the inside of biofilm formation chamber top both sides, effectively realizes that sewage fully contacts rather than the inside biofilm formation bacterial, sewage soaks the biofilm formation intracavity portion that distributes from top to bottom.

(4) The inner film hanging carrier comprises film hanging rods fixedly connected with two sides inside a film hanging cavity, a plurality of arc-shaped inner film hanging plates are fixedly distributed on the film hanging rods, fixed bags are arranged at the joint of the arc-shaped inner film hanging plates and the film hanging rods, a plurality of fiber fluff is distributed on the upper end face and the lower end face of each arc-shaped inner film hanging plate, the arc-shaped inner film hanging plates are made of porous ceramic materials, a layer of fiber woven net is coated on the upper end face and the lower end face of each porous ceramic material, the porous ceramic materials and the fiber materials of the fiber woven net are all suitable for film hanging of film hanging strains, the inner film hanging carrier is of an arc-shaped structure, the periphery of the inner film hanging carrier is abutted against the inner wall of the film hanging cavity respectively, the film hanging strains are hung on the arc-shaped inner film hanging plates, the strains are not prone to drop from the inner film hanging carrier, and the fiber fluff is beneficial to increasing the strain hanging thickness.

(5) The heating wire is installed to the inside of the outer hanging diaphragm plate of V-arrangement inlays to be established, the heater strip is connected with the interior hanging diaphragm plate of a plurality of arcs, hang the diaphragm plate in the arc and adopt the fibre to weave the string net and adopt weak heat conduction type flexible material, to high temperature environment, utilize the heater strip to heat the outer carrier department of hanging the membrane, the heat is transmitted to hanging membrane bacterial department through hanging the diaphragm plate in the arc, the environment that hanging membrane bacterial grows has effectively been optimized to the weak heat conductivity of hanging the diaphragm plate in the arc, can adapt to the change of difference in temperature round the clock on the plateau better.

(6) Hang and all seted up a plurality of aeration holes on the top both sides wall of membrane chamber, a plurality of aeration pipes inlay respectively and locate the top middle part position of the external lamina membranacea of V-arrangement, all set up a plurality of aeration pipes in low oxygen microorganism pond and the aerobic microorganism pond, and the technical staff can come to carry out accuse oxygen volume input through the aeration pipe according to required oxygen content in actual low oxygen microorganism pond and the aerobic microorganism pond.

(7) The inside fixedly connected with filter of sedimentation tank, the top of filter and the corresponding setting of bottom position of third discharge tube, the filter forms the mud with the sedimentation tank inside and sinks the district, the filter forms the supernatant with the top of sedimentation tank and filters out the district, the bottom outside of sedimentation tank is equipped with the fluid-discharge tube that filters out the district with the supernatant and is linked together, the technical staff can set up in the top portion that the mud sinks the district and stir the structure for the separation of muddy water.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the aerobic microbial pool of the present invention;

FIG. 3 is a schematic diagram of the structure of the outer carrier for membrane hanging of the present invention;

FIG. 4 is an internal view of the joint between the V-shaped externally hung membrane plate and the carrier in the hanging membrane according to the present invention;

FIG. 5 is a schematic structural view of the joint of the film hanging rod and the arc-shaped inner film hanging plate of the invention;

FIG. 6 is a schematic structural diagram of the biofilm culturing rod, the arc-shaped inner biofilm culturing plate and the biofilm culturing strain of the invention after biofilm culturing.

The reference numbers in the figures illustrate:

1 low-oxygen microorganism pool, 101 water inlet pipe, 2 anaerobic pool, 3 aerobic microorganism pool, 4 sedimentation tank, 401 filter plate, 5 first discharge pipe, 6 second discharge pipe, 7 third discharge pipe, 8 sludge return pipe, 9 shunt pipes, 10 overflow ports, 11 outer carrier of hanging membrane, 111V-shaped outer hanging membrane plate, 112 hanging membrane cavity, 113 circulation port, 114 aeration hole, 12 inner carrier of hanging membrane, 13 hanging membrane rod, 14 arc inner hanging membrane plate, 141 fixing bag, 142 fiber fluff, 15 limit table, 16 heating wire, 17 aeration pipe.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may 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 in specific cases to those skilled in the art.

Example 1:

please refer to fig. 1-4, a dual sludge phosphorus and nitrogen removal device suitable for plateau domestic sewage treatment, comprising a low oxygen microorganism tank 1, an anaerobic tank 2, an aerobic microorganism tank 3 and a sedimentation tank 4, wherein the top end of the low oxygen microorganism tank 1 is communicated with a sewage source through a water inlet pipe 101, the outlet of the low oxygen microorganism tank 1 is connected with the inlet of the anaerobic tank 2 through a first discharge pipe 5, the outlet of the anaerobic tank 2 is connected with the inlet of the aerobic microorganism tank 3 through a second discharge pipe 6, the outlet of the aerobic microorganism tank 3 is connected with the inlet of the sedimentation tank 4 through a third discharge pipe 7, the outlet of the sedimentation tank 4 is respectively connected with the anaerobic tank 2 and the top end of the low oxygen microorganism tank 1 through a sludge return pipe 8, the top ends of the low oxygen microorganism tank 1 and the aerobic microorganism tank 3 are respectively provided with diversion platforms, the bottom ends of the two diversion platforms are respectively provided with a film hanging outer carrier 11 in a stacked manner, two groups of film hanging carriers 12 are respectively arranged in the two groups of film hanging carriers 12, the low oxygen microorganism tank 1 and the anaerobic microorganism tank 2 are respectively provided with a strain embedded in the outer membrane hanging carriers 11, and an anaerobic sedimentation tank active sludge sedimentation tank 17 for completing a sludge denitrification process from the anaerobic sedimentation tank and a sludge sedimentation tank by combining the anaerobic sedimentation tank 2.

Two sets of reposition of redundant personnel platforms are including respectively fixed connection in the inside shunt tubes 9 in low oxygen microorganism pond 1, 2 tops in anaerobism pond, set up a plurality of overflow mouths 10 that are linked together with hanging the inside of membrane outer carrier 11 on the shunt tubes 9, and a plurality of overflow mouths 10 are linked together with the entry of hanging membrane chamber 112 respectively for play the reposition of redundant personnel effect to leading-in sewage.

The outer biofilm culturing carrier 11 comprises a plurality of V-shaped externally-hanging membrane plates 111 which are distributed in an up-and-down laminated manner, biofilm culturing cavities 112 are formed in the V-shaped externally-hanging membrane plates 111, circulation ports 113 are formed in the bottoms of the V-shaped externally-hanging membrane plates 111, the V-shaped externally-hanging membrane plates 111 which are adjacent up and down are arranged in a staggered manner, the circulation ports 113 on the V-shaped externally-hanging membrane plates 111 above are communicated with the inlets of the biofilm culturing cavities 112 on the V-shaped externally-hanging membrane plates 111 below, a limiting table 15 for limiting the V-shaped externally-hanging membrane plates 111 at the bottom end is embedded and installed on the inner walls of the low-oxygen microorganism pool 1 and the aerobic microorganism pool 3, the overflow ports 10 are respectively connected with the inlets of the biofilm culturing cavities 112 corresponding to the positions of the overflow ports, the biofilm culturing cavities 112 are of a V-shaped structure, two sides of the top ends of the biofilm culturing cavities 112 are respectively communicated with the overflow ports 10, sewage is filled into the biofilm culturing cavities 112 from top to the inside, and the inside of the biofilm culturing strains distributed up and down, and the sewage is effectively and fully contacted with the biofilm culturing strains inside thereof.

Referring to fig. 4-6, the membrane-hanging internal carrier 12 includes membrane-hanging rods 13 fixedly connected to two sides inside the membrane-hanging cavity 112, a plurality of arc-shaped internal membrane-hanging plates 14 are fixedly distributed on the membrane-hanging rods 13, fixing bags 141 are disposed at the joints of the arc-shaped internal membrane-hanging plates 14 and the membrane-hanging rods 13, a plurality of fiber fluffs 142 are uniformly distributed on the upper and lower end surfaces of the arc-shaped internal membrane-hanging plates 14, the membrane-hanging internal carrier 12 is of an arc-shaped structure, the peripheries of the membrane-hanging internal carrier 12 respectively abut against the inner walls of the membrane-hanging cavity 112, membrane-hanging strains are hung on the arc-shaped internal membrane-hanging plates 14, the arrangement of the fiber fluffs 141 is favorable for increasing the strain hanging thickness, the arc-shaped internal membrane-hanging plates 14 are made of porous ceramic materials, the upper and lower end surfaces of the porous ceramic materials are respectively coated with a layer of fiber woven hanging net, the porous ceramic materials and the fiber materials of the fiber woven hanging nets are both suitable for hanging membranes of membrane-hanging strains, and are not easy to cause the membrane-hanging strains to fall from the membrane-hanging internal carrier 12.

The heating wire 16 is installed to the inside of the V-shaped external hanging membrane plate 111, the heating wire 16 is connected with the plurality of arc internal hanging membrane plates 14, the arc internal hanging membrane plates 14 are made of fiber woven hanging nets and made of weak heat conduction type flexible materials, aiming at a high-temperature environment, the heating wire 16 is used for heating the places of the external hanging membrane carriers 11, heat is transmitted to the places of hanging membrane strains through the arc internal hanging membrane plates 14, the environment for the growth of the hanging membrane strains is effectively optimized through the weak heat conduction of the arc internal hanging membrane plates 14, the change of day and night temperature difference on a plateau can be better adapted, a plurality of aeration holes 114 are formed in the two side walls of the top end of the hanging membrane cavity 112, a plurality of aeration pipes 17 are respectively embedded in the middle positions of the top ends of the V-shaped external hanging membrane plates 111, a plurality of aeration pipes 17 are arranged in the low-oxygen microbial pool 1 and the aerobic microbial pool 3, and technical personnel can input oxygen control amount through the aeration pipes 17 according to the required oxygen content in the actual low-oxygen microbial pool 1 and the aerobic microbial pool 3.

Please refer to fig. 1, in addition, it is to be supplemented that a filter plate 401 is fixedly connected inside the sedimentation tank 4, the top end of the filter plate 401 is arranged corresponding to the bottom end of the third drainage pipe 7, a sludge subsidence area is formed inside the filter plate 401 and the sedimentation tank 4, a supernatant filtering area is formed on the top of the filter plate 401 and the sedimentation tank 4, a drainage pipe communicated with the supernatant filtering area is arranged outside the bottom end of the sedimentation tank 4, and a stirring structure can be arranged at the top end of the sludge subsidence area by a technician for separating mud from water.

s1, introducing sewage into a low-oxygen microorganism pool 1 through a water inlet pipe 101, and respectively flowing into a plurality of film hanging cavities 112 on a plurality of V-shaped external film plates 111 through a plurality of overflow ports 10 on a shunt pipe 9, wherein denitrifying bacteria are hung in the film hanging cavities 112, and the sewage stays in the low-oxygen microorganism pool 1 for 1-1.5 hours to realize denitrification reaction of the sewage;

s2, introducing the sewage flowing through the low-oxygen microorganism pool 1 into an anaerobic pool 2, wherein phosphorus accumulating bacteria microorganisms are arranged in the anaerobic pool 2, the phosphorus accumulating bacteria microorganisms in the activated sludge release phosphorus in an anaerobic manner, and absorb organic matters in the water at the same time, so that energy is provided for absorbing a large amount of phosphorus in a later aerobic state, and the sewage stays in the anaerobic pool 2 for 0.4-0.5h;

s3, pumping the sewage treated by the anaerobic tank 2 into an aerobic microbial tank 3 through a second discharge pipe 6, and shunting the sewage into film hanging cavities 112 in a plurality of V-shaped externally-hung film plates 111 through a plurality of overflow ports 10 in the aerobic microbial tank 3, wherein digestive bacteria are hung in the film hanging cavities 112 at the aerobic microbial tank 3 to remove residual ammonia nitrogen and nitrate nitrogen;

s4, finally, the sewage treated by the aerobic microbial pool 3 is led into the sedimentation pool 4, the sludge is precipitated in a sludge subsidence area, supernatant is filtered by the filter plate 401 and discharged from the liquid discharge pipe, the settled sludge is led back to the anaerobic pool 2 and the inner low-oxygen microbial pool 1 through the sludge return pipe 8, and the activated sludge realizes the dephosphorization function in the anaerobic pool 2.

The invention completes the double sludge dephosphorization and denitrification process combining the biomembrane method and the activated sludge method by reflowing the sludge precipitated from the interior of the sedimentation tank 4 to the low-oxygen microorganism tank 1 and the anaerobic tank 2, the biofilm culturing strains (denitrifying bacteria) on the biofilm culturing carriers 12 on the low-oxygen microorganism tank 1 compete with the activated sludge for organic substances and nitrate substances in the sewage and complete denitrification reaction, the content of organic carbon sources in the aerobic microorganism tank 3 is low, the growth of the biofilm culturing strains (digestive bacteria) and the completion of the nitrification reaction are facilitated, the separation and survival effects of denitrifying bacteria, phosphorus accumulating bacteria and nitrifying bacteria can be realized by only using the double reflowing of one sludge, the contradiction survival problem of each strain in the traditional activated sludge system is effectively avoided, in addition, two different biofilm culturing strains are respectively hung in the biofilm culturing external carriers 11, namely the strain is easy to be hung on the membranes, the strain fillers are not easy to fall off, and the sewage flows through the interiors of a plurality of the biofilm culturing external carriers 11, the contact surface of the sewage and the biofilm culturing membrane is effectively enlarged, and the denitrification strain effect is effectively improved.

The components used in the present invention are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. Two mud dephosphorization denitrification facility suitable for plateau domestic sewage handles, including low oxygen microbial pool (1), anaerobism pond (2), good oxygen microbial pool (3) and sedimentation tank (4), the top in low oxygen microbial pool (1) is linked together its characterized in that through inlet tube (101) and sewage source: the outlet of the low-oxygen microbial pool (1) is connected with the inlet of the anaerobic pool (2) through a first drainage pipe (5), the outlet of the anaerobic pool (2) is connected with the inlet of the aerobic microbial pool (3) through a second drainage pipe (6), the outlet of the aerobic microbial pool (3) is connected with the inlet of the sedimentation pool (4) through a third drainage pipe (7), the outlet of the sedimentation pool (4) is respectively connected with the anaerobic pool (2) and the top end of the low-oxygen microbial pool (1) through a sludge return pipe (8), the low-oxygen microbial pool (1) and the top end of the aerobic microbial pool (3) are respectively provided with a shunt table, two the bottom end of the shunt table is respectively provided with a film hanging outer carrier (11) which is arranged in a stacked manner, two groups of film hanging outer carriers (12) are respectively arranged in the film hanging outer carrier (11), two groups of film hanging carriers are respectively arranged on the film hanging carriers (12), two groups of strain hanging films are distributed on the film hanging carriers (12), the low-oxygen microbial pool (1) and the anaerobic microbial pool (2) are respectively provided with a plurality of shunt pipes (9) which are connected with a plurality of anaerobic strain hanging overflow pipes (9), the outer carrier (11) of biofilm formation includes a plurality of V-arrangement external diaphragm plates (111) of range upon range of distribution from top to bottom, and is a plurality of the membrane hanging chamber (112) has all been seted up to V-arrangement external diaphragm plate (111) inside, and is a plurality of circulation mouth (113) has all been seted up to V-arrangement external diaphragm plate (111) bottom, and adjacent from top to bottom V-arrangement external diaphragm plate (111) crisscross setting, and circulation mouth (113) on the V-arrangement external diaphragm plate (111) that is located the top are linked together with the membrane hanging chamber (112) entry on the V-arrangement external diaphragm plate (111) of below.

2. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 1, wherein: the inner walls of the low-oxygen microorganism pool (1) and the aerobic microorganism pool (3) are embedded with a limiting platform (15) for limiting a V-shaped external hanging diaphragm plate (111) at the bottom end, and the overflow ports (10) are respectively connected with inlets of film hanging cavities (112) corresponding to the positions of the overflow ports.

3. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 1, wherein: the membrane hanging carrier (12) comprises membrane hanging rods (13) fixedly connected with two inner sides of a membrane hanging cavity (112), a plurality of arc-shaped inner membrane hanging plates (14) are fixedly distributed on the membrane hanging rods (13), fixing bags (141) are arranged at the positions where the arc-shaped inner membrane hanging plates (14) are connected with the membrane hanging rods (13), and a plurality of fiber fluff (142) are distributed on the upper end face and the lower end face of each arc-shaped inner membrane hanging plate (14).

4. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 3, wherein: the arc-shaped inner film hanging plate (14) is made of porous ceramic materials, and the upper end face and the lower end face of each porous ceramic material are respectively coated with a layer of fiber woven hanging net.

5. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 4, wherein: the V-shaped externally-hung membrane plate (111) is internally provided with a heating wire (16) in an embedded mode, the heating wire (16) is connected with the arc-shaped internally-hung membrane plates (14), and the arc-shaped internally-hung membrane plates (14) are made of weak heat conduction type flexible materials through fiber woven nets.

6. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 5, wherein: a plurality of aeration holes (114) are formed in two side walls of the top end of the film hanging cavity (112), and a plurality of aeration pipes (17) are respectively embedded in the middle of the top end of the V-shaped external film hanging plate (111).

7. The double-sludge dephosphorization and denitrification device suitable for plateau domestic sewage treatment according to claim 1, wherein: the inside fixedly connected with filter (401) of sedimentation tank (4), the top of filter (401) sets up with the bottom position of third discharge pipe (7) is corresponding, filter (401) and sedimentation tank (4) inside formation mud subsides the district, filter (401) and sedimentation tank (4) top formation supernatant filter out the district, the bottom outside of sedimentation tank (4) is equipped with the fluid-discharge tube that is linked together with supernatant filter out the district.

8. The double-sludge dephosphorization and denitrification process applicable to the plateau domestic sewage treatment device, which is disclosed by any one of claims 1 to 7, is characterized by comprising the following steps of: the method comprises the following steps:

s1, sewage is guided into a low-oxygen microorganism pool (1) through a water inlet pipe (101) and respectively flows into a film hanging cavity (112) on a plurality of V-shaped external hanging film plates (111) through a plurality of overflow ports (10) on a shunt pipe (9), denitrifying bacteria are hung in the film hanging cavity (112), and the sewage stays in the low-oxygen microorganism pool (1) for 1-1.5 hours to realize the denitrification reaction of the sewage;

s2, introducing the sewage flowing through the low-oxygen microorganism tank (1) into an anaerobic tank (2), wherein phosphorus-accumulating bacteria microorganisms are arranged in the anaerobic tank (2), the phosphorus-accumulating bacteria microorganisms in the activated sludge release phosphorus anaerobically and absorb organic matters in the water at the same time, so that energy is provided for absorbing a large amount of phosphorus in a later aerobic state, and the sewage stays in the anaerobic tank (2) for 0.4-0.5h;

s3, pumping the sewage treated by the anaerobic tank (2) into an aerobic microbial tank (3) through a second discharge pipe (6), and distributing the sewage into film hanging cavities (112) in a plurality of V-shaped external film plates (111) through a plurality of overflow ports (10) in the aerobic microbial tank (3), wherein digestive bacteria are hung in the film hanging cavities (112) at the aerobic microbial tank (3) to remove residual ammonia nitrogen and nitrate nitrogen;

s4, finally, introducing the sewage treated by the aerobic microbial pool (3) into a sedimentation pool (4), precipitating the sludge in a sludge settling area, filtering supernatant by a filter plate (401) and discharging the supernatant from a liquid discharge pipe, leading the settled sludge back to the anaerobic pool (2) and the inner low-oxygen microbial pool (1) again through a sludge return pipe (8), and realizing the dephosphorization function of the activated sludge in the anaerobic pool (2).