CN209906576U

CN209906576U - Two-point water inlet MBBR pool combined BAF pool enhanced denitrification device

Info

Publication number: CN209906576U
Application number: CN201920577227.0U
Authority: CN
Inventors: 牛学义; 牛卉; 于萍
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-01-07
Anticipated expiration: 2029-04-25

Abstract

The utility model relates to a denitrification facility is reinforceed in BAF pond is united in MBBR pond of intaking two points, it includes the good oxygen pond of MBBR, MBBR oxygen deficiency pond, conventional high density sedimentation tank, the BAF pond of mutual intercommunication, wherein, has all added MBBR suspension carrier in good oxygen pond of MBBR and the MBBR oxygen deficiency pond, adopts the branch point mode of intaking to the good oxygen pond of MBBR and MBBR oxygen deficiency pond respectively. The utility model discloses can be used to upgrade and build the sewage treatment plant who has the BAF pond, make its play water TN and TP satisfy the more strict standard of country, also can be used to the newly-built facility of sewage treatment.

Description

Two-point water inlet MBBR pool combined BAF pool enhanced denitrification device

Technical Field

The utility model relates to a denitrification facility is reinforceed in joint BAF pond in MBBR pond of intaking two points belongs to the sewage treatment field.

Background

The Biological Aerated Filter (BAF) is a form of biological contact oxidation process, and is a new sewage treatment technology which is internationally raised in recent years. At present, thousands of sewage treatment plants with different sizes are applied to countries such as Europe, America, Japan and the like. It can be widely used for treating organic wastewater such as municipal sewage, residential sewage, domestic miscellaneous wastewater, food processing water, brewing and the like. The bioreactor is filled with granular filler with high specific surface area, and the lower part of the filler layer is aerated by blowing air to provide carrier for the growth of microorganisms and oxygen demand. When the sewage flows through the packing layer from top to bottom or from bottom to top, the air and the sewage are contacted in the reverse direction or the same direction. The sewage is subjected to biochemical reaction when passing through the biofilm on the surface of the filler, so that organic matters are removed, and the filler simultaneously plays a role in physical filtration. The BAF has the greatest characteristic of integrating biological oxidation and suspended solid interception, and saves a subsequent secondary sedimentation tank.

MBBR is a moving bed biofilm reactor, and the principle is that a certain amount of suspension carriers are added into the reactor to improve the biomass and the biological species in the reactor, so that the treatment efficiency of the reactor is improved. As the density of the filler is close to that of water, the filler is completely mixed with the water during aeration, and the environment for the growth of microorganisms is three phases of gas, liquid and solid. The collision and shearing action of the carrier in water makes air bubbles finer, and the utilization rate of oxygen is increased. In addition, each carrier has different biological species inside and outside, anaerobic bacteria or facultative bacteria grow inside, aerobic bacteria grow outside, each carrier is a micro-reactor, so that nitrification reaction and denitrification reaction exist simultaneously, the treatment effect is improved, the method is a novel efficient sewage treatment method, the carriers are in a fluidized state by virtue of the aeration in an aeration tank and the lifting action of water flow, and further activated sludge for suspension growth and a biomembrane for attachment growth are formed, so that the biomembrane for the moving bed uses the whole reactor space, the superiority of both attachment phase and suspension phase organisms is fully exerted, and the advantages of the attachment phase and the suspension phase organisms are promoted, avoided and supplemented with each other. Sludge backflow equipment and back flushing equipment are not needed in the pure membrane MBBR process tank, the MLSS concentration of the effluent of the pure membrane MBBR process tank is low, and the high-density sedimentation tank is convenient to separate sludge from water.

BAF ponds also have their deficiencies to treat sewage, such as: the requirement on the quality of inlet water is high, and the coagulation sedimentation pretreatment is needed; compared with the traditional process, the BAF tank has the defects that the nitrogen and phosphorus removal capability is poor, a preposed or postpositional denitrification BAF tank is required to be arranged in the aspect of nitrogen removal, the backflow of nitrified liquid is complicated when the preposed BAF is arranged, and a carbon source is required to be added in the operation process when the postpositional BAF is arranged; the biological aerated filter is often blocked by the filter material due to the small particle size of the filter material, and if the backwashing is not in place for a long time, the filter material is hardened and cannot run; a back washing system is required to be equipped, and the requirement on automation is high in operation.

For more than ten years in the past, a large number of domestic sewage treatment plants adopt BAF pools with small occupied area, wherein a plurality of plants only build BAF pools with functions of removing COD and partial ammonia nitrogen, and do not have prepositive or postpositive denitrification BAF pools; along with the improvement of the national requirement on the effluent quality of sewage treatment facilities, a plurality of sewage plants of the BAF pool need to be upgraded and reformed; however, due to the limitation of the structure and operation mode of BAF, it is difficult to improve the nitrogen and phosphorus removal capability of BAF by modifying the structure of BAF pool.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the sewage treatment facility who adopts BAF technology now, it can not improve the defect of getting rid of the TN ability through BAF pond self transformation because BAF self structure and operation mode's restriction provides a denitrification facility is reinforceed in BAF pond is united in two points of MBBR ponds of intaking, and the device can be used to upgrade and builds the sewage treatment plant in BAF pond, makes its play water TN and TP satisfy the more strict standard of country.

The technical scheme of the utility model is that:

a two-point water inlet MBBR pool and BAF pool combined enhanced denitrification device comprises an MBBR aerobic pool, an MBBR anoxic pool, a conventional high-density sedimentation pool and a BAF pool which are communicated with each other, wherein MBBR suspended carriers are added into the MBBR aerobic pool and are communicated with the MBBR anoxic pool through water outlet holes of the MBBR aerobic pool; an MBBR anoxic tank stirrer and an MBBR suspended carrier are arranged in the MBBR anoxic tank and communicated with a conventional high-density sedimentation tank through an MBBR anoxic tank water outlet hole; the conventional high-density sedimentation tank is communicated with the BAF tank through a BAF water inlet channel.

Furthermore, an MBBR aerobic tank water outlet roller screen is arranged right in front of an MBBR aerobic tank water outlet hole on a partition wall between the MBBR aerobic tank and the MBBR anoxic tank.

Furthermore, an MBBR anoxic tank water outlet roller screen is arranged right in front of an MBBR anoxic tank water outlet hole on a partition wall between the MBBR anoxic tank and the conventional high-density sedimentation tank.

Further, an MBBR aerobic tank aerator connected with an air blower is arranged at the bottom of the MBBR aerobic tank.

Furthermore, the flow in the MBBR aerobic pool water inlet pipe and the MBBR anoxic pool water inlet pipe which are respectively connected with the MBBR aerobic pool and the MBBR anoxic pool are proportionally distributed through a total water inlet flow meter, an MBBR anoxic pool water inlet flow meter and valves on the MBBR anoxic pool water inlet pipe.

The utility model has the advantages that:

1) the utility model can adjust and distribute the water inlet flow to the MBBR aerobic pool water inlet pipe and the MBBR anoxic pool water inlet pipe in proportion through the valve on the MBBR anoxic pool water inlet pipe, the total water inlet flow meter and the MBBR anoxic pool water inlet flow meter, and then the water flows into the MBBR aerobic pool and the MBBR anoxic pool respectively, thereby fully utilizing the advantages of the multi-point water inlet operation mode; generally, the flow rate of the wastewater entering the MBBR aerobic tank is controlled to be 30-40% of the total amount of the wastewater, and the flow rate of the wastewater entering the MBBR anoxic tank is controlled to be 60-70% of the total amount of the wastewater.

2) Compare with the MBBR oxygen deficiency pond of the same pond volume, the utility model discloses can realize distributing the inflow in the good oxygen pond of MBBR under the relatively long water conservancy dwell time (HRT), mix with the abundant contact of MBBR suspension carrier, guarantee the emergence of BOD's abundant getting rid of and ammonia nitrogen nitration in this part intake for the ammonia nitrogen of this inflow fully converts the nitrate nitrogen into in it.

3) The water quantity after full nitration reaction in the MBBR aerobic tank flows into an MBBR anoxic zone through an MBBR aerobic tank water outlet roller screen and an MBBR aerobic tank water outlet hole, and the influent water rich in nitrate nitrogen and part of the influent water of the MBBR anoxic tank are pushed by an MBBR anoxic tank stirrer and complete full denitrification by utilizing a carbon source brought by part of the influent water of the MBBR anoxic tank; through the biochemical reactions of the MBBR aerobic tank and the MBBR anoxic tank, the ammonia nitrogen and TN in the influent water are partially removed by utilizing the influent carbon source, and the pollutant load of COD, ammonia nitrogen and TN entering the BAF tank subsequently is reduced.

4) Under the condition that the designed pollution load is sufficiently reduced, factors such as dissolved oxygen in the BAF tank are controlled, and the like, so that the related effluent quality requirements can be met.

5) The MBBR suspension carriers can be intercepted in the MBBR anoxic tank of the MBBR aerobic tank through the MBBR aerobic tank water outlet roller screen and the MBBR anoxic tank water outlet roller screen respectively, and the screen area required by the roller type screen is relatively small.

6) Because the MBBR aerobic tank and the MBBR anoxic tank are pure biofilm reactors and adopt a point-by-point water inlet mode, the nitrification liquid internal reflux and sludge reflux required by the traditional activated sludge process are eliminated, the design is simplified, and the investment and the operating cost are saved.

7) Because biochemical reactions in the MBBR aerobic tank and the MBBR anoxic tank are carried out on the MBBR suspension carriers and no sludge flows back, the suspended MLSS in the MBBR aerobic tank and the MBBR anoxic tank is just the biofilm dropped from the SS and the MBBR suspension carriers brought by the inflow water, and the SS entering the subsequent conventional high-density sedimentation tank can be ensured to be within an acceptable range.

Drawings

Fig. 1 is a schematic view of the apparatus of the present invention.

The system comprises a MBBR aerobic pool 1, a MBBR anoxic pool 2, a MBBR anoxic pool 3, a conventional high-density sedimentation pool 4, a BAF pool 5, an MBBR aerobic pool water inlet pipe 6, an MBBR anoxic pool water inlet pipe 7, an MBBR suspension carrier 8, an MBBR aerobic pool aerator 9, a blower 10, an MBBR anoxic pool stirrer 11, an MBBR aerobic pool water outlet roller screen 12, an MBBR anoxic pool water outlet roller screen 13, a BAF water inlet channel 14, an MBBR aerobic pool water outlet hole 15, an MBBR anoxic pool water outlet hole 16, an MBBR anoxic pool water inlet pipe upper valve 17, a total water inlet flow meter 18 and an MBBR anoxic pool water inlet flow meter.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1, a two-point water inlet MBBR pool and BAF pool combined enhanced denitrification device comprises an MBBR aerobic pool 1, an MBBR anoxic pool 2, a conventional high-density sedimentation pool 3 and a BAF pool 4 which are communicated with each other, wherein MBBR suspended carriers 7 are added in the MBBR aerobic pool 1 and are communicated with the MBBR anoxic pool 2 through MBBR aerobic pool water outlet holes 14; the MBBR anoxic tank 2 is internally provided with an MBBR anoxic tank stirrer 10 and an MBBR suspended carrier 7, and is communicated with the conventional high-density sedimentation tank 3 through an MBBR anoxic tank water outlet hole 15; the conventional high-density sedimentation tank 3 is communicated with the BAF4 tank through a BAF water inlet channel 13.

Furthermore, an MBBR aerobic tank water outlet roller screen 11 is arranged right in front of an MBBR aerobic tank water outlet hole 14 on a partition wall between the MBBR aerobic tank 1 and the MBBR anoxic tank 2.

Furthermore, an MBBR anoxic pond water outlet roller screen 12 is arranged right in front of an MBBR anoxic pond water outlet hole 15 on a partition wall between the MBBR anoxic pond 2 and the conventional high-density sedimentation pond 3.

Further, an MBBR aerobic tank aerator 8 connected with an air blower 9 is arranged at the bottom of the MBBR aerobic tank 1.

Further, the flow in the MBBR aerobic pool water inlet pipe 5 and the flow in the MBBR anoxic pool water inlet pipe 6, which are respectively connected with the MBBR aerobic pool 1 and the MBBR anoxic pool 2, are proportionally distributed through a total water inlet flow meter 17, an MBBR anoxic pool water inlet flow meter 18 and a valve 16 on the MBBR anoxic pool water inlet pipe.

The utility model discloses a work flow does:

1) partial inlet water passing through the total inlet water flow meter enters the MBBR aerobic tank through an MBBR aerobic tank inlet pipe, and the partial inlet water and the MBBR suspended carrier are fully mixed and subjected to mass transfer under the oxygenation and stirring of a bottom MBBR aerobic tank aerator, so that COD (chemical oxygen demand) and ammonia nitrogen of the partial inlet water are fully reacted and converted in the MBBR aerobic tank.

2) The muddy water after the reaction in the MBBR aerobic tank flows through an MBBR aerobic tank water outlet roller screen and an MBBR aerobic tank water outlet hole to enter the MBBR anoxic tank, is fully mixed with the other part of the inlet water rich in the carbon source flowing into the MBBR anoxic tank through a valve on an MBBR anoxic tank water inlet pipe and an MBBR anoxic tank water inlet flow meter under the pushing of an MBBR anoxic tank stirrer, and is subjected to full denitrification biochemical reaction by utilizing the carbon source brought by the inlet water on an MBBR suspended carrier.

3) The muddy water after the reaction in the MBBR anoxic zone flows into the conventional high-density sedimentation tank through the MBBR anoxic tank water outlet roller screen and the MBBR anoxic tank water outlet holes, the supernatant in which the muddy water is separated flows into the BAF tank through the BAF water inlet channel to complete the subsequent biochemical process, and the sediment residual sludge flowing into the MBBR anoxic tank can be discharged by a mud bucket at the bottom of the conventional high-density sedimentation tank.

Example one:

the design scale of a certain urban sewage treatment plant is 50000m for each day, the designed influent COD concentration is 400mg/L, BOD concentration and is 160mg/L, the ammonia nitrogen concentration is 37mg/L, TN concentration and is 45mg/L, TP concentration and is 4mg/L, the original design adopts 10 groups of conventional BAF pools, and the original designed effluent standard is the first-level B standard of pollutant discharge standard GB18918-2002 of the urban sewage treatment plant; later, local governments require upgrading and reforming of the sewage treatment plant, and the new standard requires that the effluent reaches the four types of national surface water standards, namely that the effluent COD concentration is 30mg/L, BOD, the concentration is 5mg/L, and the ammonia nitrogen concentration is 1.5mg/L, TN, the ammonia nitrogen concentration is 15mg/L, TP and the concentration is 0.3 mg/L; use the utility model discloses upgrade to this sewage treatment and reform transform the back, reform transform the advection primary sedimentation pond that two links to each other of this factory into continuous MBBR aerobic tank respectively, MBBR oxygen deficiency pond and conventional high density sedimentation tank, design MBBR aerobic tank inflow is 40% of total inflow, MBBR oxygen deficiency pond inflow is 60% of total inflow, the HRT in the MBBR aerobic tank that calculates according to 40% inflow is 4h, and the HRT in MBBR oxygen deficiency pond is 1.6h, the filling rate that the MBBR suspended packing in MBBR aerobic tank and the MBBR oxygen deficiency pond is 40%. Compared with the operation of the original pure BAF tank, the improved BAF tank strengthens the functions of removing COD, denitriding and dephosphorizing by facilities, and the effluent standard reaches the four standards of national surface water.

It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be within the purview of this invention.

Claims

1. A two-point water inlet MBBR pool and BAF pool combined enhanced denitrification device is characterized by comprising an MBBR aerobic pool, an MBBR anoxic pool, a conventional high-density sedimentation pool and a BAF pool which are communicated with each other, wherein MBBR suspended carriers are added into the MBBR aerobic pool and are communicated with the MBBR anoxic pool through water outlet holes of the MBBR aerobic pool; an MBBR anoxic tank stirrer and an MBBR suspended carrier are arranged in the MBBR anoxic tank and communicated with a conventional high-density sedimentation tank through an MBBR anoxic tank water outlet hole; the conventional high-density sedimentation tank is communicated with the BAF tank through a BAF water inlet channel.

2. The two-point water inlet MBBR pool and BAF pool combined enhanced denitrification device of claim 1, wherein an MBBR aerobic pool water outlet roller screen is arranged right in front of an MBBR aerobic pool water outlet hole on a partition wall between the MBBR aerobic pool and the MBBR anoxic pool.

3. The two-point water inlet MBBR tank and BAF tank combined enhanced denitrification device of claim 1, wherein an MBBR anoxic tank water outlet roller screen is arranged right in front of an MBBR anoxic tank water outlet hole on a partition wall between the MBBR anoxic tank and a conventional high-density sedimentation tank.

4. The two-point water inlet MBBR tank and BAF tank combined enhanced denitrification device of claim 1, wherein the MBBR aerobic tank is provided with an MBBR aerobic tank aerator connected with a blower at the bottom.

5. The two-point water inlet MBBR pool combined BAF pool enhanced denitrification device of claim 1, wherein the flow rates of the MBBR aerobic pool water inlet pipe and the MBBR anoxic pool water inlet pipe which are respectively connected with the MBBR aerobic pool and the MBBR anoxic pool are proportionally distributed through a total water inlet flow meter, an MBBR anoxic pool water inlet flow meter and valves on the MBBR anoxic pool water inlet pipe.