CN212770366U - Liftable micro-power villages and small towns sewage treatment device - Google Patents
Liftable micro-power villages and small towns sewage treatment device Download PDFInfo
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- CN212770366U CN212770366U CN202021775974.4U CN202021775974U CN212770366U CN 212770366 U CN212770366 U CN 212770366U CN 202021775974 U CN202021775974 U CN 202021775974U CN 212770366 U CN212770366 U CN 212770366U
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Abstract
The utility model relates to sewage treatment, in particular to a liftable micro-power village and town sewage treatment device, which comprises a sewage treatment tank or a sewage treatment container with an opening at the upper end, and an anaerobic zone, an anoxic zone, an aerobic zone, a first sedimentation tank and a second sedimentation tank which are separated by partition plates and are not communicated with each other are sequentially arranged from left to right; the device has very obvious effects on the aspects of operation stability, standard-reaching guarantee of the effluent quality and the like.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment and specifically relates to a villages and small towns sewage treatment device of low running cost of oligodynamic. The biological contact oxidation filler part can rise and fall according to the climatic conditions, and different aeration modes are realized, so that the operation cost is further reduced.
Background
At present, domestic sewage in most of villages and towns and almost all rural concentrated residential areas in China is directly discharged without being treated, so that serious pollution of ground water bodies and eutrophication of lakes and reservoirs are caused, and 90% of water quality of water sources in China is polluted to different degrees. Along with the increasing level of integration of rural urbanization and urban and rural areas, the discharge amount of domestic sewage in the rural areas can further and rapidly increase, which undoubtedly brings greater pressure to the improvement of local water quality. In order to protect urban water sources and gradually improve the water environment quality, the sewage treatment strength must be increased. Therefore, the treatment of small-sized domestic sewage in villages, towns and rural areas is particularly important. However, the living modes in rural areas are dispersed, the cost for building a sewage collecting net and a sewage treatment plant is very high, so that a small-range self-flowing unpowered sewage treatment system is mostly adopted in the past, but the treatment process of the sewage treatment system is backward, the treated water quality cannot reach the discharge index, the problems that the sludge of the system is easy to block and the like exist, and the sewage treatment system is not basically adopted at present. The key direction of research and development at present is a micro-power village and town sewage treatment system which aims at small-range sewage treatment and can meet the discharge standard. At present, micro-power village and town sewage treatment integrated equipment is provided by a plurality of enterprises, the running cost is more than 1.2 yuan/ton of sewage through statistics, and higher operation cost becomes an important factor for limiting village and town application and market popularization.
SUMMERY OF THE UTILITY MODEL
Therefore, the device carries out optimized design on the biological filler on the basis of the traditional micro-power village and town sewage treatment process (AAO + biological contact oxidation) to form a liftable biological filler module. And aiming at the time period with high air temperature, the biological filler module is lifted, and the operation cost is reduced by adopting a natural drop aeration mode. When the air temperature is low, the biological filler component falls into the integrated equipment and operates according to the traditional 'AAO + biological contact oxidation', so that the operation effect in winter is enhanced. Therefore, the comprehensive operation cost can be reduced by 10-25% compared with other micro-power village and town sewage treatment integrated equipment all the year around, and the micro-power village and town sewage treatment integrated equipment is particularly suitable for village and town sewage treatment projects in northern cold regions.
A liftable micro-power village and town sewage treatment device comprises a sewage treatment tank or a sewage treatment container with an opening at the upper end, and an anaerobic zone, an anoxic zone, an aerobic zone, a first sedimentation tank and a second sedimentation tank which are separated by partition plates (are not communicated) and mutually independent are sequentially arranged from left to right;
a perforated water distributor is arranged at the bottom of the anaerobic zone, and a water inlet of the perforated water distributor is connected with a sewage source to be treated through a water inlet flow meter by a water inlet lift pump; the middle part of the anaerobic zone is provided with a rope-type filler;
the top of the partition board which is spaced from the anaerobic zone and the anoxic zone is provided with an overflow trough which is communicated with the anaerobic zone and the anoxic zone and is used as a water outlet of the anaerobic zone, and the middle lower part in the anoxic zone is provided with a stirrer;
the bottom of the partition board which is arranged at the interval of the anoxic zone and the aerobic zone is provided with a through hole which is communicated with the anoxic zone and the aerobic zone and is used as a water outlet of the anoxic zone; the bottom in the aerobic zone is provided with a disc aerator, and external air is connected with an air inlet of the disc aerator after passing through an aeration fan and a gas flowmeter; the middle part and the upper part in the aerobic zone are provided with aerobic filler layers, the aerobic filler layers are of a lifting structure, and the upper opening end of the aerobic zone is provided with a hydraulic oil cylinder for driving the aerobic filler layers to reciprocate up and down to form a lifting biological contact oxidation filler system; the aerobic filler layer is formed by sequentially stacking 3-10 filler layers from top to bottom in an interval mode, each filler layer is formed by a hollow closed steel groove body with an opening at the upper end, the bottom surface of each steel groove body is provided with a sieve plate, the bottom of each groove body serves as a water permeable plate, pebble fillers are filled in each steel groove body, and the pebble fillers are flatly laid in the groove bodies;
an overflow pipe is arranged at the upper part in the aerobic zone, one end of the overflow pipe is positioned at the upper part in the aerobic zone and is used as an overflow water inlet, the other end of the overflow pipe is connected with a first water inlet of a pipeline mixer, a water outlet of the pipeline mixer extends into the middle part of a first sedimentation tank through a pipeline, and liquid medicine in a flocculant dissolving box is connected with a second water inlet of the pipeline mixer through a dosing metering pump and a dosing flowmeter;
a return pipe is arranged between the anoxic zone and the aerobic zone, a water inlet of the return pipe is positioned at the middle lower part in the aerobic zone, a water outlet of the return pipe is positioned at the upper part in the anoxic zone, and a large-proportion internal reflux pump is arranged on the return pipe;
a bell jar is arranged in the middle of the first sedimentation tank, the bell jar is a hollow container with an opening at the lower end and a closed upper end, a pipeline outlet which is positioned in the middle of the first sedimentation tank and connected with the water outlet of the pipeline mixer extends into the bell jar, and honeycomb inclined tube filler is arranged at the upper part (above the bell jar) in the first sedimentation tank to form an inclined plate sedimentation zone; the inner part of the bottom end of the first sedimentation tank (below the bell jar) is a hollow inverted frustum structure with an opening at the upper end and a closed lower end and is used as a sedimentation collection cavity;
the top of the partition board which is arranged between the first sedimentation tank and the second sedimentation tank is provided with an overflow trough which is communicated with the first sedimentation tank and the second sedimentation tank and is used as a water outlet of the first sedimentation tank, and the middle upper part of the second sedimentation tank is provided with a sand filtration layer; a water outlet is arranged at the bottom of the second sedimentation tank; a backwashing water pump is arranged below the sand filtering layer at the lower part of the second sedimentation tank, and a backwashing water outlet is arranged above the sand filtering layer at the upper part of the second sedimentation tank.
The liftable biological contact oxidation packing system controls the aerobic packing layer to lift through the hydraulic oil cylinder, so that the aerobic packing layer can lift and move to the upper part of the aerobic zone to leave the aerobic zone or fall back and move into the aerobic zone;
PAC solution (polyaluminium chloride) with the mass concentration of 8-12% or PAFC (polyaluminium ferric chloride) flocculant with the mass concentration of 3-5% is filled in the flocculant dissolving box.
The water outlet of the return pipe is positioned at the upper part in the anoxic zone and is close to the water inlet at the top of the anoxic tank, so that the water inlet and the return liquid are fully mixed.
The specific structure of the liftable biological contact oxidation filler system is as follows:
the number of the slideway rods is more than 2, more than 2 slideway rods are vertically arranged and uniformly distributed around a tank body (also called a stuffing box), the lower end of each slideway rod is fixedly connected (welded) on a bottom supporting piece, and the bottom supporting piece is fixedly connected (welded) on a container (side wall surface or bottom surface) in an aerobic area; more than 2 multi-stage hydraulic cylinders are fixed on the plane of the upper opening end of the aerobic zone, 3-10 stuffing boxes are sequentially arranged from top to bottom, and adjacent stuffing boxes are connected through a steel wire rope; more than 2 limiting sleeves are welded on the outer wall surface of each stuffing box, the limiting sleeves on each stuffing box are the same in number, are correspondingly and uniformly distributed and are vertically and fixedly connected (welded) on the outer wall surface of the stuffing box, the corresponding limiting sleeves on 3-10 stuffing boxes from top to bottom are coaxially arranged, and the limiting sleeves are sleeved on the chute rod and can slide relative to the chute rod; the limiting sleeve of the uppermost stuffing box is connected with a hydraulic rod of the multi-stage hydraulic cylinder through a lifting connecting piece; when the stuffing boxes need to be lifted, the hydraulic rods in the multistage hydraulic cylinders extend upwards, the lifting connecting piece rises along with the hydraulic rods, firstly, the upper limiting sleeve of the stuffing box on the uppermost layer drives the stuffing boxes to rise along the slide way rods, the steel wire rope on the uppermost layer between the stuffing boxes on the uppermost layer and the stuffing boxes on the next layer (the second layer from the top) is straightened, and the straightened steel wire rope drives the stuffing boxes on the next layer (the second layer) to be lifted; and analogizing in turn, and finally realizing that 3-10 stuffing boxes are lifted to the height required by the design.
When the height between two adjacent steel tank bodies is reduced to the minimum, the distance between two adjacent steel tank bodies is 10-20 cm; when the height between two adjacent steel groove bodies is increased to the maximum, the interval between two adjacent steel groove bodies is 80-120 cm.
The water outlet pipe of the large-proportion internal reflux pump is a hose, when the temperature is higher in summer, the aerobic filler layer rises to the position above the aerobic area, and the aeration fan stops running; the water outlet of the hose is moved to the top of the aerobic packing layer, and sewage sequentially passes through the bottom water permeable plate of each layer of the packing tank body to realize the function of internal reflux.
The liftable micro-power village and town sewage treatment device is applied to sewage treatment:
the domestic sewage to be treated enters the anaerobic zone through the water inlet lift pump and the water inlet flow meter and enters the perforated water distributor from the water inlet of the perforated water distributor;
sewage flows into the anaerobic zone through the perforated water distributor and enters the anoxic zone through a water outlet at the top of the anaerobic zone in an upflow mode;
sewage in the anoxic zone flows downwards and enters the aerobic zone through a water outlet at the bottom of the anoxic zone;
sewage in the aerobic zone flows into the middle part of the first sedimentation tank after being mixed in a pipeline mixer through an overflow pipe and a flocculating agent; then flows into a second sedimentation tank from the water outlet of the first sedimentation tank, and finally is drained from the water outlet of the second sedimentation tank.
When the outdoor temperature is higher than 15 ℃, the liftable biological contact oxidation packing system rises out of the aerobic zone, the packing layers are expanded upwards, the gap between every two adjacent packing layer tank bodies is 80-120cm, and the operation of the aeration fan is stopped; moving a pipeline outlet connected with a large-proportion internal reflux pump 4 to the top of the uppermost layer of the packing layer tank body, wherein the reflux volume ratio is 2-4 times;
or when the outdoor temperature is lower than or equal to 15 ℃, the liftable biological contact oxidation packing system rises out of the box body and falls back to the aerobic zone, and the gap between every two adjacent packing layer grooves is 10-20 cm; starting an aeration fan to operate; the gas-water volume ratio is 5:1, the outlet of the pipeline connected with the large-proportion internal reflux pump 4 is moved to the vicinity of the water inlet of the anoxic zone, and the reflux volume ratio is 2-4 times.
A flocculating agent dissolving box is filled with PAC solution (polyaluminium chloride) with the mass concentration of 8-12% or PAFC (polyaluminium ferric chloride) flocculating agent with the mass concentration of 3-5% and is arranged in the flocculating agent dissolving box, and the flocculating agent dissolving box is driven to a pipeline mixer through a dosing metering pump and a dosing flowmeter to be mixed with inlet water; adding PAC or PAFC according to the following formula;
PAC or PAFC dosing estimation formula:
Y＝0.01X
total phosphorus removal rate Y-
PAC or PAFC dosage X-mgPAC/L sewage or X-mgPAFC/L sewage. The utility model discloses product advantage:
1. low running cost
The sewage treatment of villages and towns in China needs equipment which is not high, but low in running cost, strong in adaptability, simple in operation and durable in leather. Therefore, the device starts from the practical situation of sewage treatment in villages and towns in China, and is based on the AAO process which is most widely applied, stable in operation and strong in environmental adaptability in China at present, biological contact oxidation fillers are added for enhancing the operation effect, and the process mainly comprising AAO and biological contact oxidation is formed. The traditional village and town sewage treatment integrated equipment usually adopts blast aeration and is provided with a stirrer, a reflux pump and other equipment, so that the energy consumption is relatively high. In order to further reduce the operation cost of the village and town sewage treatment integrated equipment, the device carries out optimized design on the biological contact oxidation filler, and a lifting device of the filler is added. When the air temperature is higher, the biological contact oxidation filler is unfolded and lifted to form a natural aeration mode of five-stage drop aeration, and the running electricity cost is reduced. When the temperature is lower, biochemical reaction is inhibited, and in order to ensure the low-temperature operation effect, the biological contact oxidation filler is dropped into the village and town sewage treatment integrated equipment and operated according to the traditional 'AAO + biological contact oxidation' process. Compared with other micro-power village and town sewage treatment integrated equipment, the comprehensive annual operation cost is more energy-saving and lower.
2. Simple operation
In order to further reduce the construction cost of the village and town sewage treatment integrated equipment, on the premise of ensuring the effluent quality to reach the standard, unnecessary mechanical equipment is simplified, a process unit (such as a traditional MBR (membrane bioreactor) which has high energy consumption, high construction cost, higher requirement on professional quality of personnel and complex operation is abandoned, the traditional 'AAO + biological contact oxidation' is optimally designed, a filler material with lower price is adopted, the filler material is arranged in layers, the filler particle size is reasonably configured, and the additional operation caused by the pollution and blockage of the filler is avoided. The village and town sewage treatment integrated equipment only needs to regularly patrol, discharge mud and control the lifting of the filler, is very simple to operate, has low requirement on professional quality of operating personnel, and is particularly suitable for the actual situation of rural areas in China.
3. Operation is stable
Although the device adopts the traditional sewage treatment process, the traditional process is optimized and perfected according to the actual condition of the sewage in villages and towns and the requirement of the drainage standard, and the operation effect and the impact resistance of the traditional process are exerted to the maximum extent. Considering that the national requirements on nitrogen and phosphorus indexes of sewage treatment facilities are increasingly strict, the device is provided with a large-proportion reflux pump, the internal reflux ratio is 1.5-2 times of that of the traditional process, and a raw water carbon source is fully utilized for biological nitrogen and phosphorus removal. Meanwhile, due to the increase of the internal reflux ratio, the aeration effect and the nitrogen and phosphorus removal effect are enhanced in the process of falling stream aeration. In addition, the anaerobic section of the AAO process is redesigned, so that the hydrolysis effect is realized, the running stability of a biochemical system is effectively protected, and the impact resistance is provided. The sedimentation section is also optimally designed, auxiliary facilities for chemical phosphorus removal are added, the dual functions of removing suspended matters and total phosphorus are achieved, a sand filtering unit is added, and the quality of the effluent water is further ensured. Therefore, the device has very obvious effects on the aspects of operation stability, guarantee of standard water quality of the discharged water and the like.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
in the figure: 1. a water intake lift pump; 2. a water inlet flow meter; 3. a perforated water distributor; 4. a large-scale internal reflux pump; 5. an aeration fan; 6. dissolving a flocculant in a pesticide box; 7. a gas flow meter; 8. dosing a metering pump; 9. a dosing flow meter; 10. a pipeline mixer; 11. backwashing the water pump; 12. a filler; 13. a stirrer; 14. A liftable biological contact oxidation filler system; 15. performing inclined plate sedimentation; 16. sand filtration 17, an overflow groove 18 and a slideway rod; 19 a multi-stage hydraulic cylinder; 20. a limiting sleeve; 21. lifting the connecting piece; 22. a bottom support; 23. a steel cord.
Detailed Description
Embodiment 1 a liftable micro-power village and town sewage treatment plant, including the sewage treatment pond (or sewage treatment container) of upper end open-ended, from left to right have separate mutually independent (i.e. not communicate) anaerobic zone, anoxic zone, aerobic zone, first sedimentation tank, second sedimentation tank separated by the baffle in proper order;
the bottom of the anaerobic zone is provided with a perforated water distributor (the perforated water distributor is composed of a conduit with water outlet through holes on the outer wall surface, one end of the conduit is closed, the other end of the conduit is used as a water inlet), the domestic sewage to be treated enters the anaerobic zone through a water inlet lifting pump 1 and a water inlet flowmeter 2 and enters the perforated water distributor from the water inlet of the perforated water distributor, and the perforated water distributor 3 is adopted to uniformly distribute water at the bottom of the anaerobic zone. The middle part of the anaerobic zone is provided with rope type filler 12 (C2 type soft filler in green environment-friendly filler factories in Yixing city), which fully plays the roles of hydrolyzing and degrading pollutants in the anaerobic zone.
An overflow trough which is communicated with the anaerobic zone and the anoxic zone is arranged at the top of a partition plate which is arranged between the anaerobic zone and the anoxic zone and is used as a water outlet of the anaerobic zone, sewage flows into the anaerobic zone through a perforated water distributor 3 and enters the anoxic zone through the water outlet at the top of the anaerobic zone in an upflow mode, and a stirrer is arranged at the middle lower part in the anoxic zone;
the bottom of the partition board at intervals between the anoxic zone and the aerobic zone is provided with through holes for communicating the anoxic zone and the aerobic zone and is used as an anoxic zone water outlet, sewage in the anoxic zone flows downwards to enter the aerobic zone through the water outlet at the bottom of the anoxic zone, the bottom in the aerobic zone is provided with a disc aerator, external air is connected with an air inlet of the disc aerator after passing through an aeration fan 5 and a gas flowmeter 7, and blast aeration is carried out in low-temperature seasons in winter. The middle part and the upper part in the aerobic zone are provided with aerobic filler layers, the aerobic filler layers are in a lifting structure, and the bottom of the aerobic filler layers is provided with a multi-stage hydraulic oil cylinder (multi-stage hydraulic cylinder) for driving the aerobic filler layers to reciprocate up and down to form a lifting biological contact oxidation filler system 14. The aerobic packing layer is formed by stacking 5 (3-10) packing layers from top to bottom at intervals in turn, each packing layer is composed of a hollow closed steel tank body with an opening at the upper end, the bottom surface of the steel tank body is a sieve plate, a plurality of (such as more than 20) uniformly distributed round holes (round through holes with the diameter of 5mm) are formed in the bottom surface, the bottom of the tank body is a water permeable plate, and the 5 steel tank bodies are filled with fillers which are pebbles with the diameter of 20mm and are tiled in the tank body;
the liftable biological contact oxidation filler system (14) has the specific structure that:
the number of the slideway rods 18 is 2, the 2 slideway rods are vertically arranged and uniformly distributed on the left side and the right side of a tank body (also called a stuffing box), the lower end of each slideway rod 18 is welded on a bottom supporting piece, and the bottom supporting piece 22 is welded on the bottom surface of a container in an aerobic zone; 2 multi-stage hydraulic cylinders 19 are fixed on the plane of the upper opening end of the aerobic zone, 5 stuffing boxes are sequentially arranged from top to bottom, and adjacent stuffing boxes are connected through a steel wire rope; 2 limiting sleeves 20 are welded on the outer wall surface of each stuffing box, the limiting sleeves on each stuffing box are the same in number, are correspondingly and uniformly distributed and are vertically welded on the outer wall surfaces of the left side and the right side of each stuffing box, the corresponding limiting sleeves on 5 stuffing boxes from top to bottom are coaxially arranged, and the limiting sleeves are sleeved on the chute rod and can slide relative to the chute rod; the limiting sleeve of the uppermost stuffing box is connected with a hydraulic rod of the multi-stage hydraulic cylinder through a lifting connecting piece; when the stuffing boxes need to be lifted, the hydraulic rods in the multistage hydraulic cylinders extend upwards, the lifting connecting piece 21 lifts along with the hydraulic rods, firstly, the upper limiting sleeve 20 of the stuffing box on the uppermost layer drives the stuffing boxes to lift along the slide way rod 18, the steel wire rope 23 on the uppermost layer between the stuffing boxes on the uppermost layer and the stuffing boxes on the next layer (the second layer from the top) is straightened, and the straightened steel wire rope drives the stuffing boxes on the next layer (the second layer) to lift; and analogizing in sequence, and finally realizing that 5 stuffing boxes are lifted to the height required by the design.
When the height between two adjacent steel groove bodies is reduced to the bottommost part (minimum), the interval between two adjacent steel groove bodies is 15 cm; when the height between two adjacent steel groove bodies is increased to the top (maximum), the interval between two adjacent steel groove bodies is 100 cm;
an overflow pipe is arranged at the upper part in the aerobic zone, one end of the overflow pipe is positioned at the upper part in the aerobic zone and is used as an overflow water inlet, the other end of the overflow pipe is connected with a first water inlet of a pipeline mixer (a three-way type mixer), a water outlet of the pipeline mixer extends into the middle part of a first sedimentation tank through a pipeline, and liquid medicine in a flocculant dissolving medicine box is connected with a second water inlet of the pipeline mixer through a dosing metering pump and a dosing flowmeter;
a return pipe is arranged between the anoxic zone and the aerobic zone, the water inlet of the return pipe is positioned at the middle lower part in the aerobic zone, the water outlet of the return pipe is positioned at the upper part in the anoxic zone, and a large-proportion internal reflux pump 4 is arranged on the return pipe; when the packing layer falls down in the aerobic zone in winter at low temperature, the operation is carried out according to the traditional biological contact oxidation method, and the effluent is distributed in the middle of the water inlet sedimentation tank through the overflow pipe at the top of the aerobic zone and the pipeline mixer 10. The reflux liquid returns to the position near the water inlet at the top of the anoxic tank from the inlet of the pipeline at the middle part of the aerobic tank through the large-proportion internal reflux pump 4, so that the water inlet and the reflux liquid are fully mixed. When the temperature is higher in summer, the aerobic filler layer is lifted to the position above the aerobic zone, and the aeration fan 5 stops running. The outlet pipe of the large-proportion internal reflux pump 4 is a hose, and is moved to the top of the aerobic packing layer tank body on the uppermost layer (the steel tank body opening end of the packing layer on the uppermost layer), sewage sequentially passes through the bottom permeable plates of the 5 layers of packing tank bodies, so that the internal reflux function is realized, and the sewage flows back to the aerobic tank (the aerobic tank stops aeration at the moment and is in an anoxic environment). The water outlet mode is the same as the above. The flocculant dissolving tank 6 is provided with PAFC (polyaluminum ferric chloride) flocculant with the mass concentration of 4%, and the flocculant enters a pipeline mixer 10 through a dosing metering pump 8 and a dosing flowmeter 9 to be effectively mixed with effluent of an aerobic area. A bell jar is arranged in the middle of the first sedimentation tank, the bell jar is a hollow container with an opening at the lower end and a closed upper end, a pipeline outlet which is positioned in the middle of the first sedimentation tank and connected with the water outlet of the pipeline mixer extends into the bell jar, and honeycomb inclined tube packing (Henan Hua constant environmental protection PVC phi 501000 multiplied by 1000 multiplied by delta) is arranged at the upper part (above the bell jar) in the first sedimentation tank to form an inclined plate sedimentation zone; the inner part of the bottom end of the first sedimentation tank (below the bell jar) is a hollow inverted frustum structure with an opening at the upper end and a closed lower end and is used as a sedimentation collection cavity;
the top of a partition plate which is arranged between a first sedimentation tank (also called a high-efficiency sedimentation tank or a secondary sedimentation tank) and a second sedimentation tank (also called a sand filtration clean water tank) at intervals is provided with an overflow trough which is communicated with the first sedimentation tank and the second sedimentation tank and is used as a water outlet of the first sedimentation tank, and the middle upper part of the second sedimentation tank is provided with a sand filtration layer (the filler is quartz sand with the particle size of 1-2 mm); a water outlet is arranged at the bottom of the second sedimentation tank; a backwashing water pump 11 is arranged below the sand filtering layer at the lower part of the second sedimentation tank, and a backwashing water outlet is arranged above the sand filtering layer at the upper part of the second sedimentation tank.
In order to ensure the coagulating sedimentation effect of the secondary sedimentation tank (namely the first sedimentation tank), a bell jar is arranged on a water inlet pipe of the secondary sedimentation tank, then the ascending flow is filled by a honeycomb-type inclined pipe to realize solid-liquid separation, the length of the inclined pipe is 1m, the inclined pipe is installed at an inclination angle of 60 degrees with the horizontal plane, enters an active sand filter layer through an overflow well mouth at the top of the secondary sedimentation tank, and is drained through a water outlet at the bottom of the sand filter layer. The bottom of the sand filtration area is provided with a backwashing water pump 11 (which is a submersible pump), when sand filtration pollution is serious, backwashing is carried out, and backwashing water is merged into a water outlet pipe through an overflow pipe at the top.
The operation parameters are as follows:
(1) design processing Scale 200m3/d
(2) Equipment size: 14.8 m.times.2.8 m.times.3.3 m
(3) The main water quality index of the effluent meets the primary standard in discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002).
(4) Hydraulic retention time: 11.5h (wherein the anaerobic section (anaerobic zone) is 1.5h, the anoxic section (anoxic zone) is 2h, and the aerobic section (aerobic zone) is 8 h).
(5) Energy consumption per ton of water: 0.3-0.5 degree electricity/ton water;
hydraulic retention time of the secondary sedimentation tank: 1-1.5 h;
(6) when the outdoor temperature is higher than 15 ℃, the liftable biological contact oxidation packing system 14 rises out of the box body (namely the aerobic area), the packing layers are expanded upwards, the gap between every two adjacent steel groove bodies is 1m (the interval between every two adjacent steel groove bodies is 1m), and the operation of the aeration fan 5 is stopped. And moving a pipeline outlet connected with a large-proportion internal reflux pump 4 to the top of the groove body on the uppermost layer, wherein the reflux volume ratio is 2-4 times, and the reflux liquid passes through the phi 20 pebble packing layer and the water permeable plate at the bottom of the groove and is dripped into the groove body on the lower layer, and so on, and returns to the aerobic tank through the water outlet of the groove body on the lower layer when reaching the groove body on the lowest layer. And the sewage flows back to the aerobic tank through the permeable plate of the lower tank body. At the moment, the aerobic tank is not aerated, and the dissolved oxygen of the mixed liquid returned from the anoxic section is low, so that an anoxic environment can be formed in the aerobic tank to realize the denitrification function.
(7) When the outdoor temperature is lower than or equal to 15 ℃, the liftable biological contact oxidation filling system 14 is lifted out of the tank body and falls back to the tank body, and the tank bodies are overlapped together (the interval between two steel tank bodies which are adjacent up and down is 15 cm). The gap between the tank body and the tank body is 10cm, and the aeration fan 5 is started to operate. The gas-water volume ratio is 5:1, the outlet of the pipeline connected with the large-proportion internal reflux pump 4 is moved to the vicinity of the water inlet of the anoxic zone, and the reflux volume ratio is 2-4 times. The operation is carried out according to the traditional AAO + biological contact oxidation process. The effluent enters a secondary sedimentation tank. The top of the box body is covered with a cover, and a straw curtain is attached to the box body for heat preservation.
(8) The flocculant dissolving box 6 is provided with 10 mass percent PAC solution (polyaluminium chloride) or 4 mass percent PAFC, and the PAC solution or PAFC is pumped into a pipeline mixer 10 through a dosing metering pump 8 and a dosing flowmeter 9 to be mixed with inlet water. The PAC addition was added according to the following formula. PAC or PAFC dosing estimation formula:
Y＝0.01X
total phosphorus removal rate Y-
PAC or PAFC dosage X-mgPAC/L sewage or X-mgPAFC/L sewage.
Claims (6)
1. A liftable micro-power village and town sewage treatment plant which is characterized in that:
comprises a sewage treatment tank or a sewage treatment container with an opening at the upper end, and an anaerobic zone, an anoxic zone, an aerobic zone, a first sedimentation tank and a second sedimentation tank which are separated by partition plates and are mutually independent are sequentially arranged from left to right;
a perforated water distributor is arranged at the bottom of the anaerobic zone, and a water inlet of the perforated water distributor (3) is connected with a sewage source to be treated through a water inlet flow meter (2) by a water inlet lift pump (1); the middle part of the anaerobic zone is provided with a rope-type filler;
the top of the partition board which is spaced from the anaerobic zone and the anoxic zone is provided with an overflow trough which is communicated with the anaerobic zone and the anoxic zone and is used as a water outlet of the anaerobic zone, and the middle lower part in the anoxic zone is provided with a stirrer;
the bottom of the partition board which is arranged at the interval of the anoxic zone and the aerobic zone is provided with a through hole which is communicated with the anoxic zone and the aerobic zone and is used as a water outlet of the anoxic zone; the bottom in the aerobic zone is provided with a disc aerator, and outside air passes through an aeration fan (5) and a gas flowmeter (7) and then is connected with an air inlet of the disc aerator; aerobic packing layers are arranged at the middle part and the upper part in the aerobic zone, the aerobic packing layers are in a lifting structure, a hydraulic oil cylinder for driving the aerobic packing layers to reciprocate up and down is arranged at the upper opening end of the aerobic zone, and a lifting biological contact oxidation packing system (14) is formed; the aerobic filler layer is formed by sequentially stacking 3-10 filler layers from top to bottom in an interval mode, each filler layer is formed by a hollow closed steel groove body with an opening at the upper end, the bottom surface of each steel groove body is provided with a sieve plate, the bottom of each groove body serves as a water permeable plate, pebble fillers are filled in each steel groove body, and the pebble fillers are flatly laid in the groove bodies;
an overflow pipe is arranged at the upper part in the aerobic zone, one end of the overflow pipe is positioned at the upper part in the aerobic zone and is used as an overflow water inlet, the other end of the overflow pipe is connected with a first water inlet of a pipeline mixer, a water outlet of the pipeline mixer extends into the middle part of a first sedimentation tank through a pipeline, and liquid medicine in a flocculant dissolving box is connected with a second water inlet of the pipeline mixer through a dosing metering pump and a dosing flowmeter;
a return pipe is arranged between the anoxic zone and the aerobic zone, the water inlet of the return pipe is positioned at the middle lower part in the aerobic zone, the water outlet of the return pipe is positioned at the upper part in the anoxic zone, and a large-proportion internal reflux pump (4) is arranged on the return pipe;
a bell jar is arranged in the middle of the first sedimentation tank, the bell jar is a hollow container with an opening at the lower end and a closed upper end, a pipeline outlet which is positioned in the middle of the first sedimentation tank and connected with the water outlet of the pipeline mixer extends into the bell jar, and honeycomb inclined tube filler is arranged at the upper part (above the bell jar) in the first sedimentation tank to form an inclined plate sedimentation zone; the inner part of the bottom end of the first sedimentation tank (below the bell jar) is a hollow inverted frustum structure with an opening at the upper end and a closed lower end and is used as a sedimentation collection cavity;
the top of the partition board which is arranged between the first sedimentation tank and the second sedimentation tank is provided with an overflow trough which is communicated with the first sedimentation tank and the second sedimentation tank and is used as a water outlet of the first sedimentation tank, and the middle upper part of the second sedimentation tank is provided with a sand filtration layer; a water outlet is arranged at the bottom of the second sedimentation tank; a backwashing water pump (11) is arranged below the sand filtering layer at the lower part of the second sedimentation tank, and a backwashing water outlet is arranged above the sand filtering layer at the upper part of the second sedimentation tank.
2. The liftable micro-power village and town sewage treatment plant according to claim 1, characterized in that:
the liftable biological contact oxidation packing system (14) controls the aerobic packing layer to lift through a hydraulic oil cylinder, so that the aerobic packing layer can be lifted to move to the upper part of the aerobic zone to leave the aerobic zone or fall back to move into the aerobic zone;
the flocculant is PAC solution with the mass concentration of 8-12% or polymeric aluminum ferric chloride PAFC flocculant with the mass concentration of 3-5% filled in the flocculant dissolving box.
3. The liftable micro-power village and town sewage treatment plant according to claim 1, characterized in that:
the water outlet of the return pipe is positioned at the upper part in the anoxic zone and is close to the water inlet at the top of the anoxic tank, so that the water inlet and the return liquid are fully mixed.
4. The liftable micro-power village and town sewage treatment plant according to claim 1, characterized in that:
the liftable biological contact oxidation filler system (14) has the specific structure that:
the number of the slideway rods (18) is more than 2, more than 2 slideway rods (18) are vertically arranged and uniformly distributed around the groove body, the lower end of each slideway rod (18) is fixedly connected or welded on a bottom supporting piece, and the bottom supporting piece (22) is fixedly connected or welded on the side wall surface or the bottom surface of the container in the aerobic zone; more than 2 multi-stage hydraulic cylinders (19) are fixed on the plane of the upper opening end of the aerobic zone, 3-10 stuffing boxes are sequentially arranged from top to bottom, and adjacent stuffing boxes are connected through a steel wire rope; more than 2 limiting sleeves (20) are welded on the outer wall surface of each stuffing box, the limiting sleeves on each stuffing box are the same in number, are correspondingly and uniformly distributed and are fixedly connected or welded on the outer wall surface of the stuffing box in a vertical mode, the corresponding limiting sleeves on 3-10 stuffing boxes are coaxially arranged from top to bottom, and are sleeved on the chute rod and can slide relative to the chute rod; the limiting sleeve of the uppermost stuffing box is connected with a hydraulic rod of the multi-stage hydraulic cylinder through a lifting connecting piece; when the stuffing boxes need to be lifted, the hydraulic rods in the multistage hydraulic cylinders extend upwards, the lifting connecting piece (21) lifts along with the hydraulic rods, firstly, the upper limiting sleeve (20) of the stuffing box on the uppermost layer drives the stuffing box to lift along the slide way rod (18), the steel wire rope (23) on the uppermost layer between the stuffing boxes on the uppermost layer and the stuffing boxes on the next layer is straightened, and the straightened steel wire rope drives the stuffing boxes on the next layer to lift; and analogizing in turn, and finally realizing that 3-10 stuffing boxes are lifted to the height required by the design.
5. The liftable micro-power village and town sewage treatment plant according to claim 1 or 4, characterized in that:
when the height between two adjacent steel tank bodies is reduced to the minimum, the distance between two adjacent steel tank bodies is 10-20 cm; when the height between two adjacent steel groove bodies is increased to the maximum, the interval between two adjacent steel groove bodies is 80-120 cm.
6. The liftable micro-power village and town sewage treatment plant according to claim 1, characterized in that:
a water outlet pipe of the large-proportion internal reflux pump (4) is a hose, when the temperature is higher in summer, the aerobic filler layer is lifted to the position above the aerobic area, and the aeration fan (5) stops running; the water outlet of the hose is moved to the top of the aerobic packing layer, and sewage sequentially passes through the bottom water permeable plate of each layer of the packing tank body to realize the function of internal reflux.
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| CN202021775974.4U CN212770366U (en) | 2020-08-24 | 2020-08-24 | Liftable micro-power villages and small towns sewage treatment device |
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| CN202021775974.4U CN212770366U (en) | 2020-08-24 | 2020-08-24 | Liftable micro-power villages and small towns sewage treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084996A (en) * | 2020-08-24 | 2022-02-25 | 辽宁省环保集团有限责任公司 | Liftable micro-power village and town sewage treatment device and application thereof |
| CN115304154A (en) * | 2022-02-22 | 2022-11-08 | 北京中持碧泽环境技术有限责任公司 | Denitrification unit and control method thereof |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114084996A (en) * | 2020-08-24 | 2022-02-25 | 辽宁省环保集团有限责任公司 | Liftable micro-power village and town sewage treatment device and application thereof |
| CN114084996B (en) * | 2020-08-24 | 2024-03-08 | 辽宁省环保集团有限责任公司 | Liftable micro-power village and town sewage treatment device and application thereof |
| CN115304154A (en) * | 2022-02-22 | 2022-11-08 | 北京中持碧泽环境技术有限责任公司 | Denitrification unit and control method thereof |
| CN115304154B (en) * | 2022-02-22 | 2024-04-19 | 北京中持碧泽环境技术有限责任公司 | Denitrification unit and control method thereof |
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