CN111592109A - Biological pond of integrated form AAO - Google Patents
Biological pond of integrated form AAO Download PDFInfo
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- CN111592109A CN111592109A CN202010591564.2A CN202010591564A CN111592109A CN 111592109 A CN111592109 A CN 111592109A CN 202010591564 A CN202010591564 A CN 202010591564A CN 111592109 A CN111592109 A CN 111592109A
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- 239000010802 sludge Substances 0.000 claims abstract description 243
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000007872 degassing Methods 0.000 claims abstract description 21
- 238000010992 reflux Methods 0.000 claims description 52
- 238000009826 distribution Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 9
- 238000004062 sedimentation Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an integrated AAO biological pool, which comprises: an AAO biological pond unit and a sludge pump pond unit; wherein, the AAO biological pond unit consists of a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a degassing zone which are connected in sequence; the sludge pump pool unit is arranged in the degassing area embedded in the AAO biological pool unit and is positioned at the tail end water outlet end of the aerobic pool; the sludge pump pool unit and the aerobic zone are arranged on the same wall; the sludge pump in the sludge pump pool unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pool unit through channels arranged on the pool wall. This biological pond of integrated form AAO has realized that sludge pump unit is integrated in the biological pond unit of AAO, and mud and sewage are double-phase not influence each other, and can pass through channel backward flow mud, it is big to have reduced the occupation of land that sets up sludge pump pond alone, and pipeline backward flow energy consumption is big, and it is inconvenient to maintain, builds and the high scheduling problem of running cost.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an integrated AAO biological tank.
Background
At present, most of conventional sewage plants adopt an AAO main body process comprising an AAO biological tank and a sludge pump tank which are separately arranged.
In the existing AAO process sewage plant, an AAO biological tank and a sludge pump tank are divided into two monomers to be separately arranged, wherein the sludge pump tank is positioned between the biological tank and a secondary sedimentation tank, sludge is led in the secondary sedimentation tank to be discharged, and sludge is discharged to be divided into two systems which are composed of two sets of pump sets, namely an external reflux sludge pump and a residual sludge pump; and pumping the external return sludge to the water inlet end of the biological pond, wherein the return flow is generally 100% of the designed scale, and pumping the residual sludge to a sludge treatment system. The sludge pump pool and the distribution well of the secondary sedimentation pool can be combined into a circular or independent rectangular design, but the two schemes are adjacent to and independent from the biological pool except the difference between the type of the pump pool and the type selection of the water pump, and return sludge is also conveyed to the water inlet end of the biological pool through a total sludge pipeline.
The existing AAO process engineering that the AAO biological tank and the sludge pump tank are separated into separate tanks at least has the following disadvantages:
(1) the independent sludge pump pond needs the sludge pipeline to carry mud, and mud needs long distance sludge pipeline to carry, has increased along the way loss of water conservancy, has promoted the lift specification and the energy consumption of backwash pump. Taking a sewage treatment plant with a design scale of 5 ten thousand tons/day as an example, the total pipeline length of the return sludge pipe from the pump tank to the water inlet end of the biological tank reaches 140 meters, and the design flow rate of the return sludge is 2083m3The method adopts a sludge conveying pipeline with DN900 specification according to the calculation of the economic flow rate of 0.9m/s, the hydraulic loss of the produced pipeline along the way and the local part is about 0.4m, the power consumption is correspondingly increased by 85KWh/d according to the Beijing areaThe average unit price of the industrial electricity is calculated to be 0.72 yuan/KWh, and the electricity charge generated in one year is 2.23 ten thousand yuan.
(2) The material and installation cost of the total return sludge pipeline are generated, and the engineering investment is increased. For example: the cost for welding the steel pipe with the length of 140 meters and the DN900 specification is 14.04 ten thousand yuan, the total installation cost for the 1.5 meter pipe top soil covering pipeline is 22.09 ten thousand yuan, and the total installation cost is 36.13 ten thousand yuan; if the ball milling cast iron pipe is adopted, the corresponding pipe cost is 23.6 ten thousand yuan, the total installation cost of the pipeline is 12.18 ten thousand yuan, and the total cost is 35.78 ten thousand yuan.
(3) The sludge pump pool is designed independently to increase the total floor area and the facility investment of the matched approach and ladder. In order to shorten the total laying distance of the sludge pipeline as much as possible, the sludge pump pond is generally arranged between the biological pond and the secondary sedimentation pond. Biological pond is the rectangle structure, and two heavy pond conventionals are circular structure, and pump pond sets up between two centers and certainly can increase biological pond and two heavy pond intervals so that arrange and construct. The influence distance of the two schemes is widened by at least 8 meters, and taking a sewage treatment plant with a design scale of 5 ten thousand tons/day as an example, the total occupied area of the pump pool and the road space to the plant area is 640-880 m2. Meanwhile, the vehicle running approach from the factory road to the pump pond needs to be considered on a land block with a large area, so that the water pump equipment is convenient to transport and install. The length of the approach is increased by about 40 meters, the width of the road is measured by at least 2 meters, and the corresponding investment is 2.2 ten thousand yuan. The pump pond is also provided with an upper pond ladder stand, the investment is calculated according to 1.2 ten thousand yuan, and the total construction investment of the two items is 3.4 ten thousand yuan. The total of the three items relates to the investment of the engineering construction of about 39.5 ten thousand yuan, the annual running cost of 2.23 ten thousand yuan, and the occupied area of the land block of 640-880 m2. It should be noted that the above investment does not include the cost of foundation pit excavation, foundation construction and outer wall civil engineering for constructing the pump pool separately.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide an integrated AAO biological tank, which can solve the problems that in the existing AAO process sewage treatment project, an AAO biological tank and a sludge pump tank are separately arranged, the long-distance conveying through a sludge pipeline is high in energy consumption, the total return sludge pipeline cost is high, the occupied area of the sludge pump tank is large, the investment is large and the like.
The purpose of the invention is realized by the following technical scheme:
an embodiment of the present invention provides an integrated AAO biological pond, including:
an AAO biological pond unit and a sludge pump pond unit; wherein,
the AAO biological pond unit consists of a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a degassing zone which are connected in sequence;
the sludge pump pool unit is arranged in the AAO biological pool unit, is embedded in the degassing area and is positioned at the tail end water outlet end of the aerobic pool;
the sludge pump pool unit and the biological area are arranged on the same wall;
and a sludge pump in the sludge pump pond unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pond unit through a channel arranged on the pond wall.
According to the technical scheme provided by the invention, the integrated AAO biological pool provided by the embodiment of the invention has the beneficial effects that:
through the degasification district with the embedded setting of sludge pump unit in the biological pond unit of AAO, and make the sludge pump in the sludge pump pond unit be connected to the biological pond unit of AAO's of channel setting on the pool wall respectively in advance anoxic zone and anoxic zone, it is integrated in the biological pond unit of AAO to have realized with sludge pump unit, and mud and sewage are double-phase each other not influence, and can through channel backward flow mud, it is big to have reduced the occupation of land that sets up the sludge pump pond alone, pipeline backward flow energy consumption is big, it is inconvenient to maintain, the high problem of construction and running cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic plan view of an integrated AAO biological pond provided by an embodiment of the present invention;
FIG. 2 is a schematic plan view of a lower layer of a top plate of a local sludge pump pool unit of an integrated AAO biological pool provided by an embodiment of the invention;
fig. 3 is a first schematic sectional view of a sludge pump basin unit of an integrated AAO biological basin according to an embodiment of the present invention;
fig. 4 is a schematic sectional view of a sludge pump tank unit of the integrated AAO biological tank according to an embodiment of the present invention;
the parts corresponding to each mark in the figure are: 100-AAO biological pond unit; 200-sludge pump pool unit; 1-a pre-anoxic zone; 2-an anaerobic zone; 3-anoxic zone; 4-an aerobic zone; 5-a degassing zone; 6-internal reflux sludge pump pool; 7-external reflux sludge pump pool; 8-excess sludge pump pool; 9-external reflux sludge channel; 10-internal reflux sludge channel; 11-internal reflux sludge pump; 12-excess sludge pump; 13-external reflux sludge pump; 14-sludge valve wells; 15-valve well drainage port; 16-an inlet water distribution weir of the external reflux sludge pump pool; 17-external reflux sludge pump guide wall; 18-entering a mud pipe from the secondary sedimentation tank; 19-residual sludge discharge pipe.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides an integrated AAO biological pond, including:
an AAO biological pond unit and a sludge pump pond unit; wherein,
the AAO biological pond unit consists of a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a degassing zone which are connected in sequence;
the sludge pump pool unit is arranged in the AAO biological pool unit, is embedded in the degassing area and is positioned at the tail end water outlet end of the aerobic pool;
the sludge pump tank unit and the aerobic zone of the AAO biological tank unit are arranged on the same wall; preferably, the sludge pump pool unit and an internal reflux pump area of an aerobic area of the AAO biological pool unit are arranged on the same wall;
and a sludge pump in the sludge pump pond unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pond unit through a return sludge channel arranged on the pond wall.
Referring to fig. 2 and 3, in the integrated AAO biological pond, the sludge pump pond unit includes:
the system comprises an excess sludge pump pool, an external reflux sludge pump pool, an internal reflux sludge pool, an excess sludge pump, an external reflux sludge pump and an internal reflux sludge pump; wherein,
the residual sludge pump pool and the external return sludge pump pool are arranged in parallel;
the internal return sludge tank is positioned at one side of the residual sludge pump tank and the external return sludge pump tank which are arranged in parallel, and the internal return sludge tank is positioned at one side close to the water outlet end of the aerobic zone;
the excess sludge pump is arranged in the excess sludge pump tank and is connected with an external sludge storage tank through a sludge discharge pipe;
the external reflux sludge pump is arranged in the external reflux sludge pump tank;
the internal reflux sludge pump is arranged in the internal reflux sludge tank;
the sludge pump in the sludge pump pool unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pool unit through a return sludge channel arranged on the pool wall:
the external reflux sludge pump is connected with the pre-anoxic zone of the AAO biological pond unit through an external reflux sludge channel arranged on the pond walls of the aerobic zone and the anoxic zone;
the internal reflux sludge pump is connected with the anoxic zone of the AAO biological pond unit through an internal reflux sludge channel arranged on the walls of the aerobic zone and the anoxic zone.
In the integrated AAO biological tank, the residual sludge pump adopts a submersible centrifugal pump;
the external reflux sludge pump and the internal reflux sludge pump both adopt axial-flow pumps.
In the integrated AAO biological pond, the external reflux sludge channel is suspended on the pond walls of the aerobic zone and the anoxic zone;
the internal reflux sludge channel is suspended on the tank walls of the aerobic zone and the anoxic zone;
the outer return sludge channel and the inner return sludge channel are arranged in parallel in the horizontal direction and are at the same height and the same bottom in the vertical direction.
In the integrated AAO biological pond, the clear width of the external reflux sludge channel is 0.8m, and the effective water depth is 0.8 m;
the net width of the internal reflux sludge channel is 0.8m, and the effective water depth is 0.8 m.
Referring to fig. 4, in the integrated AAO biological tank, the sludge valve well is disposed in the excess sludge pump tank;
the elevation of the well part in the sludge valve well is higher than the height of the highest liquid level in the residual sludge pump pool;
and an accident water outlet is arranged on the side surface of the bottom of the sludge valve well and communicated with the residual sludge pump tank. Such as: the highest liquid level of the sludge pump pool is 1.70m, the elevation of the bottom plate of the sludge valve well is 2.00m, and the elevation difference between the two interfaces can meet the requirement that accident drainage of the valve well automatically flows to the residual sludge pump pool through a drainage outlet, so that the valve is prevented from being soaked by sewage, pump drainage measures are not needed, the power consumption can be saved, and the maintenance of the pump drainage measures is reduced.
The outer reflux sludge pump tank is internally provided with a water inlet water distribution weir and a plurality of outer reflux sludge pump guide walls;
the outer return sludge pump is arranged between the guide walls of the two adjacent outer return sludge pumps.
The pre-anoxic zone consists of a first pre-anoxic tank and a second pre-anoxic tank which are symmetrically arranged, and the first pre-anoxic tank and the second pre-anoxic tank are rectangular tank bodies integrally;
the anaerobic zone consists of a first anaerobic tank and a second anaerobic tank which are symmetrically arranged, and the first anaerobic tank and the second anaerobic tank both adopt runway type channel tank bodies;
the anoxic zone consists of a first anoxic tank and a second anoxic tank which are symmetrically arranged, and the first anoxic tank and the second anoxic tank both adopt runway type channel tank bodies;
the aerobic tank is composed of a first aerobic tank and a second aerobic tank which are symmetrically arranged, and the first aerobic tank and the second aerobic tank are both provided with rotary gallery type tank bodies.
The embodiments of the present invention are described in further detail below.
As shown in fig. 1, an embodiment of the present invention provides an integrated AAO biological pond, which is an AAO biological pond integrating a two-phase system of sewage and sludge, and integrating the two-phase system without weakening respective operation and treatment functions, wherein the integrated AAO biological pond includes an AAO biological pond unit and a sludge pump pond unit, and the sludge pump pond unit is embedded in the AAO biological pond unit and integrated with the AAO biological pond unit; the AAO biological pond unit consists of a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a degassing zone, wherein each reaction zone consists of two symmetrically distributed cell bodies, and if the pre-anoxic zone consists of a first pre-anoxic pond and a second pre-anoxic pond which are symmetrically arranged; the anaerobic zone consists of a first anaerobic tank and a second anaerobic tank which are symmetrically arranged; the anoxic zone consists of a first anoxic tank and a second anoxic tank which are symmetrically arranged; the aerobic zone consists of a first aerobic tank and a second aerobic tank which are symmetrically arranged; the degassing zone consists of a first degassing zone and a second degassing zone which are symmetrically arranged; wherein, the pre-anoxic zone adopts a rectangular tank body design, each tank body of the anaerobic zone and the anoxic zone adopts a runway type channel, and each tank body of the aerobic zone adopts a rotary gallery type. See in particular fig. 1.
Compared with a single AAO biological tank, the AAO biological tank unit with the structure has the advantages that the nitrogen and phosphorus removal function is enhanced, the water is fed in multiple points, and the carbon source of raw water can be reasonably distributed by flexibly switching the water quality during operation. The pre-anoxic zone can reduce the phosphorus release function reduced by the dissolved oxygen carried by the external return sludge directly entering the anaerobic tank, and the terminal degassing zone is arranged to reduce the dissolved oxygen in the internal return sludge, so that the dissolved oxygen does not negatively influence the functional environment of the unit when the internal return sludge returns to the anoxic zone, and the effect of improving the removal rate of total nitrogen and total phosphorus indexes is achieved.
The sludge pump pool unit is embedded in the degassing area, is positioned between the first degassing area and the second degassing area of the degassing area, and is integrated with the AAO biological pool unit, the sludge pump pool unit is arranged at the water outlet end of the corridor at the tail end of the aerobic pool, on the premise of ensuring the length of a water outlet weir calculated by a reasonable weir head, the sludge pump pool unit and the return pump area in the biological pool are arranged on the same wall, so that the residual sludge pump pool and the external return sludge pump pool which are included in the sludge pump pool unit are arranged side by side, the internal return sludge pump pool is arranged on the inner sides of the residual sludge pump pool and the external return sludge pump pool, and the influence on biochemical water outlet can be avoided by skillfully arranging the external return sludge pump and the internal return sludge pump pool. The sludge inlet path of the sludge pump pool unit corresponds to the sludge discharge of the secondary sedimentation pool, and the sludge outlet path is the water inlet end of the AAO biological pool unit. The water outlet channels of the two aerobic tanks (namely the first aerobic tank and the second aerobic tank) are respectively arranged at two sides of the sludge pump tank unit, and sewage and sludge systems are independent and do not interfere with each other; the stirrer of the degassing area is arranged outside the internal reflux sludge pump pool, and the acting force of the impeller of the stirrer obliquely plays a role in stirring the sewage area. The whole layout not only meets the requirement of convenient operation and maintenance but also normalizes the system and makes the plane view angle concise and elegant while not weakening the biochemical treatment function.
As shown in fig. 2 and 3, the sludge outlet pipeline of the secondary sedimentation tank firstly enters the sludge inlet well, and is distributed to the return sludge pump tanks (inner and outer return sludge pump tanks) and the residual sludge pump tank of the sludge pump tank unit through the sludge distribution channel after being turned; the backflow sludge pump arranged in the external backflow sludge pump pool adopts a low-lift large-flow axial flow pump, a water inlet water distribution weir and an external backflow sludge pump flow guide wall are arranged in the external backflow sludge pump pool, the hydraulic flow state can be optimized and guaranteed, and meanwhile, on the premise that the effective volume meets the standard requirement and is not less than the five-minute flow volume of the maximum water pump, the size of the sludge pump pool unit is reduced as much as possible, so that the sludge pump pool unit is convenient to arrange regularly. After being lifted by an axial flow pump, the sludge flows to an independent water outlet weir at the vertical upper end, falls by the independent water outlet weir, flows to a pre-anoxic zone through an external backflow sludge channel, the tail end of the independent water outlet weir controls the opening and the distribution proportion of backflow sludge of two pre-anoxic tanks (namely a first pre-anoxic tank and a second pre-anoxic tank) by using a gate, the backflow sludge is in a continuous opening working condition, the configuration of two functions and one standby of three devices is adopted, and the concentration of the backflow sludge is generally 7-8 g/l; one external return sludge channel and two internal return sludge channels are arranged, the external return sludge channel is arranged between the two internal return sludge channels, the two channels are arranged in parallel, and the two channels are vertically same in height and bottom (see figure 3).
The excess sludge pump arranged in the excess sludge pump pool adopts a high-lift small-flow submersible centrifugal pump, the daily lifting flow is the daily dry sludge yield of the biochemical system under 99.2% of water content, and the configuration that two devices are used one by one is adopted for the intermittent starting working condition. After being lifted by the submersible centrifugal pump, the excess sludge is conveyed to a rear-section sludge storage tank by an excess sludge discharge pipe and enters a sludge treatment system. The mud valve well of pipeline adopts the embedded setting of civil engineering in excess sludge pump pond (see fig. 4) behind the pump, is convenient for overhaul the valve from the tank deck, effectively utilizes excess sludge pump pond inner space simultaneously, no longer externally in the terrace, avoids the intensity of labour of fortune dimension personnel cell body about frequent. In addition, the accident drainage of the sludge valve well does not adopt a mode of pumping to a sewage inspection well any more, the sludge valve well is utilized to set the safety difference between the elevation and the highest liquid level in the excess sludge pump pool, and the accident drainage port reserved at the bottom is adopted to automatically flow and drain into the excess sludge pump pool. The setting mode does not need to set a secondary sewage return system for discharging sewage in the sludge valve well, and can save energy and improve the convenience of construction.
The sludge pump pool unit is arranged in parallel by adopting the excess sludge pump pool and the external reflux sludge pump pool, the internal reflux sludge pump pool is arranged on the inner sides of the excess sludge pump pool and the external reflux sludge pump pool and is embedded in the degassing area at the tail end, so that the excess sludge pump pool and the AAO biological pool unit are integrated together in a fusion manner, and the three sets of pump sets are designed to be close to each other, thereby being convenient for maintenance. The integrated AAO biological pond occupies more compact and reasonable area. The integral symmetrical civil construction arrangement is beneficial to the adjacent and regular arrangement of each functional area of the biochemical unit.
The integrated AAO organisms of the present invention have at least the following advantages:
(1) the sludge pump pool unit is embedded in the AAO biological pool unit to form an AAO biological pool with an integrated structure, a channel above the inner wall of the external biological pool is adopted for sludge backflow, the clear width of the channel is 0.8m, the effective water depth is 0.8m, the designed flow rate is 0.9m/S, the length of the channel is 50m, and the total loss of the generated path and local water head is 0.05 m. Compared with pipeline transportation, the water loss is saved by 0.35m, the reduced electricity consumption is 74KWh/d, the unit price is 0.72 yuan/KWh when the average electricity consumption of large industry in Beijing area is calculated, and the electricity cost is saved by 1.95 ten thousand yuan per year.
(2) The material and installation cost of the corresponding total return sludge pipeline are saved, the total return sludge pipeline is changed into an overhanging channel, the channel depth is 1.5m, the net width is 0.8m, the pool top plate also has the function of a walkway plate, and the investment is estimated to be increased by not more than 7.0 ten thousand yuan compared with a scheme without a return channel.
(3) The sludge pump pool unit and the AAO biological pool unit do not need to be arranged independently after being jointly built, the occupied area is not occupied additionally, the guarantee requirement of the effective volume of the biochemical pool is only considered, a certain pool volume needs to be increased due to the joint building, and the occupied area of the corresponding monomer is enlarged by 106-150 m2. Originally, the matched approach and the ladder stand which are additionally arranged independently can be shared with the biological pool monomer, and the investment of the facility is correspondingly cancelled.
In conclusion, compared with the conventional scheme, the integrated AAO biological pond saves the engineering construction investment by about 32.5 ten thousand yuan (the investment does not include the foundation pit excavation, foundation construction and outer wall civil engineering cost of independently constructing the pump pond, if the investment includes the optimization range, the investment is larger), the annual operation cost is saved by 1.95 ten thousand yuan, and the occupied area of the land can be reduced by 534-730 m2. The operation period of a general sewage treatment project is not less than 30 years, the total cost of 91 ten thousand yuan can be saved through whole-period calculation, meanwhile, the saved occupied area is saved and utilized by other monomers, the layout of a general diagram is more compact and regular, the indexes of construction land of similar projects are greatly saved, and the project declaration and the recovery area are effectively reduced under the condition that the current domestic land is increasingly tense.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention 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 invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An integrated AAO biological pond, comprising:
an AAO biological pond unit and a sludge pump pond unit; wherein,
the AAO biological pond unit consists of a pre-anoxic zone, an anaerobic zone, an anoxic zone, an aerobic zone and a degassing zone which are connected in sequence;
the sludge pump pool unit is arranged in the AAO biological pool unit, is embedded in the degassing area and is positioned at the tail end water outlet end of the aerobic pool;
the sludge pump tank unit and the aerobic zone of the AAO biological tank unit are arranged on the same wall;
and a sludge pump in the sludge pump pond unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pond unit through a return sludge channel arranged on the pond wall.
2. The integrated AAO biological pond according to claim 1, wherein the sludge pump pond unit comprises:
the system comprises an excess sludge pump pool, an external reflux sludge pump pool, an internal reflux sludge pool, an excess sludge pump, an external reflux sludge pump and an internal reflux sludge pump; wherein,
the residual sludge pump pool and the external return sludge pump pool are arranged in parallel;
the internal return sludge tank is positioned at one side of the residual sludge pump tank and the external return sludge pump tank which are arranged in parallel, and the internal return sludge tank is positioned at one side close to the water outlet end of the aerobic zone;
the excess sludge pump is arranged in the excess sludge pump tank and is connected with an external sludge storage tank through a sludge discharge pipe;
the external reflux sludge pump is arranged in the external reflux sludge pump tank;
the internal reflux sludge pump is arranged in the internal reflux sludge tank;
the sludge pump in the sludge pump pool unit is respectively connected with the pre-anoxic zone and the anoxic zone of the AAO biological pool unit through a return sludge channel arranged on the pool wall:
the external reflux sludge pump is connected with the pre-anoxic zone of the AAO biological pond unit through an external reflux sludge channel arranged on the pond walls of the aerobic zone and the anoxic zone;
the internal reflux sludge pump is connected with the anoxic zone of the AAO biological pond unit through an internal reflux sludge channel arranged on the walls of the aerobic zone and the anoxic zone.
3. The integrated AAO biological pond according to claim 2, wherein the excess sludge pump is a submersible centrifugal pump;
the external reflux sludge pump and the internal reflux sludge pump both adopt axial-flow pumps.
4. The integrated AAO biological pond according to claim 2, wherein the outer return sludge channel is suspended from the walls of the aerobic and anoxic zones;
the internal reflux sludge channel is suspended on the tank walls of the aerobic zone and the anoxic zone;
the outer return sludge channel and the inner return sludge channel are arranged in parallel in the horizontal direction and are at the same height and the same bottom in the vertical direction.
5. The integrated AAO biological pond according to claim 2 or 3, wherein the external return sludge canal has a clear width of 0.8m and an effective water depth of 0.8 m;
the net width of the internal reflux sludge channel is 0.8m, and the effective water depth is 0.8 m.
6. The integrated AAO biological pond according to claim 2 or 3, wherein the sludge valve well is disposed within the excess sludge pump pond;
the elevation of the well part in the sludge valve well is higher than the height of the highest liquid level in the residual sludge pump pool;
and an accident water outlet is arranged on the side surface of the bottom of the sludge valve well and communicated with the residual sludge pump tank.
7. The integrated AAO biological pond according to claim 2 or 3, wherein the external reflux sludge pump pond is internally provided with a water inlet distribution weir and a plurality of external reflux sludge pump guide walls;
the outer return sludge pump is arranged between the guide walls of the two adjacent outer return sludge pumps.
8. The integrated AAO biological pond according to any one of claims 1 to 3, wherein the pre-anoxic zone consists of a first pre-anoxic pond and a second pre-anoxic pond arranged symmetrically, the first pre-anoxic pond and the second pre-anoxic pond being rectangular pond bodies as a whole;
the anaerobic zone consists of a first anaerobic tank and a second anaerobic tank which are symmetrically arranged, and the first anaerobic tank and the second anaerobic tank both adopt runway type channel tank bodies;
the anoxic zone consists of a first anoxic tank and a second anoxic tank which are symmetrically arranged, and the first anoxic tank and the second anoxic tank both adopt runway type channel tank bodies;
the aerobic tank is composed of a first aerobic tank and a second aerobic tank which are symmetrically arranged, and the first aerobic tank and the second aerobic tank are both provided with rotary gallery type tank bodies.
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