CN109437393B - High-load ecological ground sewage filtering treatment method - Google Patents
High-load ecological ground sewage filtering treatment method Download PDFInfo
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- CN109437393B CN109437393B CN201910055952.6A CN201910055952A CN109437393B CN 109437393 B CN109437393 B CN 109437393B CN 201910055952 A CN201910055952 A CN 201910055952A CN 109437393 B CN109437393 B CN 109437393B
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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
- C02F3/02—Aerobic processes
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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
- C02F3/02—Aerobic processes
- C02F3/06—Aerobic processes using submerged filters
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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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
- C02F3/28—Anaerobic digestion processes
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a high-load ecological ground sewage filtering treatment method, which comprises the following steps: the raw sewage respectively flows in a spreading way in the horizontal plane direction from different heights through a plurality of water-dispersing layers which are arranged up and down, and simultaneously downwards and sequentially passes through a percolation layer and a fine filtration layer for infiltration treatment; after the raw sewage is fed and sewage in each water dispersing layer is dried, air is uniformly distributed at multiple points in the horizontal plane direction and the direction vertical to the horizontal plane from different heights through each water dispersing layer, air flow passes through the percolation layer and the fine filtration layer, and waste gas is discharged from an exhaust hole at the bottom of the fine filtration layer at the bottommost layer; the air flow directions between at least two adjacent water-dispersing layers are opposite and staggered with each other, and turbulent flow is formed inside the percolation layer positioned between the two adjacent water-dispersing layers; the sewage is discharged after the biochemical reaction in the infiltration layer and the fine filtration layer and the infiltration treatment in the biological filter unit. The problem that the sewage treatment efficiency is low that the oxygen suppliment is not enough to lead to has been solved to this scheme, and high-efficient sewage treatment is realized to the multilayer air feed.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-load ecological ground sewage filtering treatment method which is mainly used for treating domestic sewage, rural sewage, rainwater and low-concentration organic wastewater.
Background
In 13 hundred million people in China, 70% of groundwater is drunk, and in more than 660 cities, more than 400 cities use groundwater as drinking water sources. However, 90% of municipal groundwater throughout the country has been contaminated, and one set of data also indicates that groundwater is facing significant challenges. In 2011, 857 monitoring wells in the district are evaluated to be 2% of the monitoring wells of I type and II type, while the monitoring wells of IV type and V type are up to 76.8%; the water pollution situation is continuously intensified, so that the sewage treatment and regeneration industry is concerned by the unprecedented.
The underground infiltration sewage treatment facility has the advantages of small occupied area, no need of special land, small investment, low operation cost, simple and convenient maintenance and management, good treatment effect, stable operation, no secondary pollution, capability of normally operating under the low-temperature condition in winter, flexible use and the like, and is widely applied. The underground infiltration sewage treatment process is characterized by that the sewage is dispersed into artificial soil with a certain area by means of underground water-dispersing pipe, and the sewage is infiltrated from upper aeration zone, and at the same time the pollutant in the sewage can be removed from the soil by means of interception, adsorption and microbial decomposition and conversion, and the land above the infiltration system can be used as green land, dry land and parking lot.
Patent document CN102432105B discloses a method for treating underground infiltration sewage with high efficiency of nitrogen and phosphorus removal, which comprises the following steps: the original sewage is treated in the infiltration process by the infiltration area, then treated in the infiltration process by the infiltration area, and finally discharged; wherein, the lower infiltration area adopts the upper and lower multilayer to advance raw sewage respectively and carry out multilayer joint water dispersal, and the raw sewage that the bottommost layer got into provides the carbon source for the denitrification reaction. However, because the water inflow is improved by the multi-layer water distribution, and more oxygen is needed to be consumed in the infiltration process and the nitration reaction, the treatment method disclosed by the invention adopts the air inlet of the middle water dispersing layer to improve the oxygen supply amount, and has the defects of unsmooth ventilation and uneven air distribution.
Patent document CN206126963 uses pure natural ventilation for oxygen supply: the load of sewage treatment is small, oxygen supply is realized by natural ventilation, and the treatment capacity is limited. Limited by site conditions, a large site needs to be occupied. Limited by climatic conditions, for example, when the temperature is low in winter, the degradation of pollutants by naturally-ventilated oxygen-supplying microorganisms is very limited, and the microorganisms are easy to generate anaerobism. (2) When mechanical oxygen supply is adopted, the natural ventilation structure and the mechanical oxygen supply form air convection, so that the resistance energy consumption in the oxygen supply transmission process is reduced, and the natural ventilation structure is actually used as an exhaust outlet channel of the mechanical oxygen supply. Because the specific position of mechanical oxygen supply is not given, the specific oxygen supply utilization efficiency cannot be obtained, but in structural view, part of air is directly discharged from the natural ventilation structure without passing through the filter material, and the oxygen supply utilization is not good.
The patent document with the publication number CN206156856 is used for treating livestock and poultry breeding wastewater, which is high-concentration organic wastewater. Oxygen is supplied to the aerobic layer and the facultative layer respectively. However, no specific process is given, as is batch or continuous operation. The existing application technology should be operated continuously, and the main problems are that the top is open, an auxiliary heating device is not arranged for mechanical oxygen supply, the limitation of weather conditions is serious, and the treatment effect is poor in winter. Because the oxygen supply device is open and is a coarse filter, oxygen supply is easy to flow out, the oxygen supply efficiency is low, and the energy consumption is high.
Disclosure of Invention
The invention provides a high-load ecological sewage filtering treatment method, which is used for overcoming the defects of unsmooth ventilation, uneven air distribution and the like in the prior art, and improving the flowing speed and uniformity of airflow by convection type air distribution, thereby improving the biochemical reaction efficiency in the infiltration process and further improving the sewage treatment efficiency.
In order to achieve the aim, the invention provides a multi-layer combined water and gas distribution ecological sewage filtering treatment method, which comprises the following steps:
step 1, raw sewage respectively flows in a spreading manner from different heights in the horizontal plane direction through a plurality of water-dispersing layers arranged up and down, and simultaneously downwards sequentially passes through a percolation layer and a fine filtration layer for infiltration treatment;
step 2, after the raw sewage is fed, and sewage of each water dispersing layer is dried, air is uniformly distributed at multiple points in the horizontal plane direction and the vertical horizontal plane direction from different heights through each water dispersing layer, air flow passes through the percolation layer and the fine filtration layer, and waste gas is discharged from an exhaust hole at the bottom of the fine filtration layer at the bottommost layer; the air flow directions of the two adjacent water-dispersing layers vertical to the horizontal plane direction are opposite and staggered with each other, and turbulent flow is formed inside the percolation layer positioned between the two adjacent water-dispersing layers;
and 3, discharging the sewage after the sewage is subjected to biochemical reaction in the subsurface infiltration unit and is subjected to infiltration treatment in the biological filter unit.
The invention also provides a high-load ecological sewage filtering treatment method, raw sewage flows in the horizontal plane direction of a water dispersing layer through a plurality of water dispersing layers, and simultaneously flows downwards into a filter layer below each water dispersing layer for filtering, particle organic matters are intercepted, large particle organic matters are finally oxidized and decomposed by biological contact, dissolved organic matters in the raw sewage are adsorbed and decomposed by a microbial film attached to the surface of a filter material of the filter layer, sufficient oxygen is needed for oxidative decomposition, air is respectively distributed to each filter layer through each water dispersing layer arranged from top to bottom, the influence of uneven air distribution caused by the fact that wind power gradiently decreases to the interior of the filter layer or a fine filter layer far away from a wind source along the flow direction is reduced, a plurality of air flow sources are distributed in a layered manner and downwards penetrate through the filter layer from the top of each filter layer, waste gas is discharged from the bottom of the fine filter layer at the bottommost layer, so that the filter material in the interior of the filter layer and the fine filter layer can be fully contacted with the oxygen and oxidized and decomposed, the infiltration treatment efficiency is improved, thereby improving the sewage treatment efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of a high load ecological filtered wastewater treatment process provided by an embodiment of the invention;
FIG. 2 is a process flow diagram of a high load ecological filtered wastewater treatment process provided by an embodiment of the invention;
FIG. 3 is a schematic view of water flow distribution in the high-load ecological sewage filtering treatment method provided by the embodiment of the invention;
FIG. 4 is a schematic view showing the air flow distribution in the high-load ecological filtered sewage treatment method according to the embodiment of the present invention;
FIG. 5 is a schematic view showing the arrangement of each process facility in the high-load ecological filtered wastewater treatment method provided by the embodiment of the invention;
fig. 6 is a schematic view of the connection between the water inlet pipe and the water distribution-air distribution pipe network in the high-load ecological ground sewage filtration treatment method provided by the embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments 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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a high-load ecological sewage filtering treatment method. The ground filtering sewage treatment method in the invention is suitable for underground infiltration beds and biological infiltration beds.
Examples
Referring to fig. 1 to 3, the present invention provides a multi-layer combined water and gas distribution ecological sewage filtering treatment method, including:
s1, making the raw sewage pass through a plurality of water-dispersing layers arranged up and down, respectively, and simultaneously carrying out downward infiltration treatment on the raw sewage sequentially through an infiltration layer and a fine filtration layer while spreading and flowing in the horizontal plane direction from different heights;
the raw sewage enters the sewage adjusting and distributing tank 200 after being subjected to grid sedimentation in the sewage pretreatment tank 100 to remove granular sludge and anaerobic pretreatment, and is periodically conveyed into the underground infiltration unit 300 by a submersible sewage pump arranged in the sewage adjusting and distributing tank 200, the underground infiltration unit 300 adopts multi-layer combined water dispersion for the raw sewage, and most pollutants are removed in the infiltration process. The subsurface infiltration unit 300 adopts three-layer combined water distribution, and raw sewage is distributed in the first water-dispersing layer 303, the second water-dispersing layer 305 and the third water-dispersing layer 307 according to the ratio of 1:1:1, carrying out flow splitting; the underground infiltration unit 300 sequentially comprises a covering layer 301, a root blocking-sealing layer 302, a first water dispersion layer 303 (a first water distribution-air distribution layer 303a is embedded inside), a first infiltration layer 304, a second water dispersion layer 305 (a second water distribution-air distribution layer 305a is embedded inside), a second infiltration layer 306, a third water dispersion layer 307 (a third water distribution-air distribution layer 307a is embedded inside), a third infiltration layer 308 and a fine filtration layer 309 from top to bottom; the raw sewage flows on the horizontal planes of the first water distribution-air distribution layer 303a, the second water distribution-air distribution layer 305a and the third water distribution-air distribution layer 307a in the process of infiltration from the first water distribution-air distribution layer, the second water distribution-air distribution layer and the third water distribution-air distribution layer to the first percolation layer 304, the second percolation layer 306, the third percolation layer 308 and the fine filtration layer 309, and is fully distributed in the whole first water distribution layer 303, the second water distribution layer 305 and the third water distribution layer 307.
Step S2, after the raw sewage is fed and the sewage of each water scattering layer is dried, the air is uniformly distributed at multiple points in the horizontal plane direction and the direction vertical to the horizontal plane from different heights through each water scattering layer, the air flow passes through the percolation layer and the fine filtration layer, and the waste gas is discharged from the exhaust hole at the bottom of the fine filtration layer at the bottommost layer;
in an embodiment of the invention, the water dispersing layers are uniformly arranged on the horizontal plane and in the direction vertical to the horizontal plane simultaneously, for example, a planar pipe network is laid in each water dispersing layer, the arrangement of the pipe network is for example in at least one structure of a grid shape or a spiral shape or a branch shape (a protection main pipe and a plurality of branch pipes with one ends connected to the main pipe, a plurality of capillary pipes and the like are also connected to the main pipe and a branch structure similar to a tree), a plurality of holes are arranged on the pipes in the direction of the plane, holes are arranged on adjacent pipes in the direction close to each other, the positions of the holes are staggered, and turbulent flow can be formed inside the water dispersing layers during air inlet, so that dead angles inside the water dispersing layers are reduced, the air distribution inside the water dispersing layers is more uniform, and the aerobic biological treatment efficiency of the air and the water dispersing layers is improved.
The pipe networks in the two adjacent water-dispersing layers are arranged and positioned in the projection coincidence on the horizontal plane, namely the projection coincidence of the pipes on the horizontal plane, the pipes corresponding to the upper and lower positions are provided with holes in the direction close to each other, the positions of the holes are staggered, when air is admitted into the pipes, turbulent flow can be formed in the infiltration layer between the two water-dispersing layers, the pipe networks arranged in a grid shape can form turbulent flow on a plurality of vertical planes which are crossed vertically and horizontally in the infiltration layer, the pipe networks arranged in a spiral shape can form a spiral shape (also called as a ring shape, the surrounding shape can be matched with the specific shape of the water-dispersing layer, for example, the pipe is arranged in a square surrounding shape by the square water-dispersing layer, the pipe is arranged in a circular surrounding shape by the circular water-dispersing layer) and forms turbulent flow on the vertical plane which is wound, the vertical planes penetrate through the thickness of the infiltration layer, dead angles in the infiltration layer are reduced, and, so as to improve the aerobic biological treatment efficiency of the gas and the raw sewage in the percolation layer; on the other hand, compared with unidirectional air intake, the retention time of fresh air in the permeable layer is prolonged, so that aerobic biological treatment is more sufficient; in addition, the bidirectional air intake can improve the capability of gas penetrating through the infiltration layer, improve the contact area between oxygen in fresh air and the filter material in the infiltration layer, and further accelerate the aerobic biological treatment of the oxygen and organic matters permeating through the filter material.
In a preferred embodiment of the invention, the left side and the right side of the pipeline forming the pipe network are respectively provided with openings, the air flow directions between two adjacent pipelines are opposite and staggered with each other, the air is uniformly distributed on a horizontal plane, and turbulent flow is formed in a water dispersing layer; and meanwhile, the openings are respectively arranged on the two adjacent layers of pipelines in the direction facing each other, the airflow directions between the two adjacent pipelines are opposite and staggered with each other, the air is uniformly distributed on a vertical plane, turbulence is formed in the percolation layer, and in order to ensure that the airflow moves downwards on the whole, the pipeline positioned at the lowest layer is also provided with downward openings so that the airflow and the water flow to the percolation layer at the lowest layer. Preferably, in order to ensure the uniformity of the three-layer air distribution, upward openings are also distributed on the uppermost layer of pipelines, the number and the size of the upward openings are the same as those of the downward openings, and the upward openings are staggered with the downward openings. In case the water flow pressure is large enough, the first water-dispersing layer 303 may also distribute water upwards.
Compared with the existing sewage treatment equipment or sewage treatment process, the scheme provides a specific scheme for forming turbulent air supply inside an underground infiltration layer, aiming at the use condition that filter material particles inside the infiltration layer are fine and the resistance to air flow operation is large, porous staggered air distribution is provided, the air flow can form turbulent flow when flowing through the inside of the infiltration layer by artificially interfering the air flow direction, the air flow passes through most gaps of a filler medium through the interaction between the air flow and the filter material medium, the contact area of the air and the filter material medium is increased, further, the full contact of the air and the filter material medium is realized, the uniform air distribution is realized, the reaction efficiency is improved, and the method is practical and feasible.
According to the scheme, mechanical multi-layer oxygen supply is adopted, after raw sewage is fed, and sewage of each water dispersion layer is dried, air is uniformly distributed at multiple points in the horizontal plane direction and the direction vertical to the horizontal plane downwards from different heights through each water dispersion layer, air flow passes through the percolation layer and the fine filtration layer, and waste gas is discharged from an exhaust hole at the bottom of the fine filtration layer at the bottommost layer; and when the air temperature is low, the air is heated, so that the microorganisms can normally and effectively degrade pollutants. Has the characteristics of high sewage treatment load, small occupied area and no limitation of climatic conditions. This scheme adopts intermittent type operation in addition, and the oxygen suppliment utilization efficiency is high.
Referring to fig. 2, correspondingly, due to the increased sewage infiltration amount, sufficient oxygen is provided for the biochemical reaction of a large amount of sewage during the process of passing through the infiltration layer; the first water distribution-air distribution layer 303a, the second water distribution-air distribution layer 305a and the third water distribution-air distribution layer 307a all supply air, so that each layer of filler and filter material of the whole underground infiltration system keeps an aerobic environment; the input of the raw sewage is intermittent, and the air intake is also intermittent. The water distribution-air distribution pipes of the first water distribution-air distribution layer 303a, the second water distribution-air distribution layer 305a and the third water distribution-air distribution layer 307a are also used as air distribution pipes to supply air and oxygen to the system in the intermittent water distribution process, so that the fillers and filter materials of each layer of the whole underground infiltration system keep an aerobic environment, and the underground infiltration system has double functions and a compact structure.
The water-dispersing layers (including the first water-dispersing layer 303, the second water-dispersing layer 305 and the third water-dispersing layer 307) arranged from top to bottom respectively distribute air to the percolation layers (the first percolation layer 304, the second percolation layer 306 and the third percolation layer 308), the influence of uneven air distribution caused by the fact that wind force gradually decreases to the percolation layer or the fine filtration layer far away from a wind source in a gradient manner along the flow direction is reduced, a plurality of air flow sources are distributed in a layered manner and penetrate through the percolation layers in an upward and downward staggered manner from the top of each percolation layer (except for the percolation layer at the bottommost layer, and only air flow in the downward direction), so that fillers and filter materials in the percolation layer and the fine filtration layer can fully contact with oxygen and are subjected to oxidative decomposition, the downward percolation treatment efficiency is improved, and the sewage treatment efficiency is improved. The waste gas generated after the reaction is extruded by the percolation layer and the gas with higher density in the interior from top to bottom direction, and is finally discharged through the vent hole at the bottom of the fine filtering layer 309 at the bottommost layer, and the vent hole can be connected with equipment such as an air extractor to form negative pressure.
Step S3, discharging the sewage after the biochemical reaction in the infiltration layer and the fine filtration layer 309 and the infiltration treatment by the biological filter unit 400. Further removing pollutants such as nitrogen, phosphorus and the like through the biological filter unit 400, and finally discharging;
the biological filter unit 400 comprises from top to bottom: a carbon source layer, a denitrification and dephosphorization layer and a water collecting layer; the subsurface infiltration unit 300 and the biofilter unit 400 are closely connected up and down. The height of the subsurface infiltration unit is 1.3-1.5 m, and the height of the biological filter unit is 0.5-0.6 m.
The covering layer is an in-situ soil layer, a cement hardened layer or a floor brick layer; the water distribution-air distribution layers of the first layer, the second layer and the third layer mainly comprise gravels with the grain diameter of 5-40 mm, and the filling thickness is 10-20 cm; the percolation layer mainly comprises quartz sand, the saturated water permeability coefficient is 0.1-1.0 cm/s, and the filling thickness is 10-20 cm; the fine filter layer is mainly formed by mixing quartz sand, in-situ soil and zeolite, the saturated water permeability coefficient is 0.01-0.1 cm/s, and the filling thickness is 20-40 cm; the carbon source layer mainly comprises gravels with the grain diameter of 5-40 mm, and the filling thickness is 10 cm; the denitrification dephosphorization layer is mainly formed by mixing broken red brick blocks and gravels, the particle size is 5-20 mm, and the filling thickness is 50-70 cm; the water collecting layer mainly comprises gravels with the particle size of 5-40 mm, and the filling thickness is 15 cm; and performing anti-seepage treatment on the ecological filter tank. Further removing pollutants such as nitrogen, phosphorus and the like through a biological filter, and finally discharging; wherein, the underground infiltration unit is positioned above the biological filter unit and is tightly connected with the biological filter unit; the raw sewage is treated by the subsurface infiltration unit and then reaches the biological filter unit, the liquid level rises, and the area forms an aerobic-anaerobic alternate area; the aerobic-anaerobic alternating region is formed above the aerobic-anaerobic alternating region due to good ventilation and oxygen supply conditions; the lower part of the aerobic-anaerobic alternate zone is in a fully saturated zone so as to form an anaerobic zone.
After domestic sewage is pretreated, supernatant liquid is lifted by a submersible sewage pump to enter a first water distribution-air distribution layer, a second water distribution-air distribution layer and a third water distribution-air distribution layer, when the sewage flows through broken stones and a percolation layer, pollutants can be formed by microbial membranes on the surfaces of fillers and filter materials (the microbial membranes are aerobic bacteria, the microbial membranes are formed in two modes, one mode is natural formation, microorganisms in the raw sewage are hung on the surfaces of the fillers and the filter materials after the raw sewage enters an underground percolation unit for a period of time, the period is called as membrane hanging, and is usually more than twenty days2The degradation of organic substances has a process, CO2Instead of being formed instantaneously, the gas outlet in the system can be arranged at the lower part of the system, the top part and the periphery of the system are not provided with exhaust holes, the fresh air entering the system integrally flows downwards, part of the aerobic biological treatment occurs in the flowing process, and the waste gas (including CO) generated by the aerobic biological treatment is carried along2And released from raw sewageExhaust gases such as ammonia, hydrogen sulfide, etc.) are discharged together from the lower outlet. The scheme of the embodiment of the invention is to improve the proportion of the input fresh air participating in aerobic biological treatment by changing the gas distribution mode, and reduce the proportion of the fresh air which is discharged along with the waste gas without coming into reaction, thereby improving the utilization rate of the gas.
Most of the sewage directly percolates downwards under the action of gravity and sequentially penetrates through the percolation layer and the fine filtration layer, and a small part of the sewage gradually percolates downwards while transversely moving in the water dispersion layer and finally sequentially enters the fine filtration layer and the fine filtration layer. The percolation layer intercepts most of granular organic matters, the fine filtration layer intercepts few of granular organic matters, and the granular organic matters are finally decomposed through biological contact oxidation. Meanwhile, organic matters dissolved in the original sewage are adsorbed and decomposed by the microbial film attached to the surface of the filter material of the percolation layer; NH (NH)4 +Mainly adsorbed by negatively charged minerals and removed by nitrification; phosphorus is removed by adsorption and phosphate formation. When sewage which is not percolated in time meets a vertical carbon source anti-blocking pipe penetrating through the percolation layer, the sewage enters a horizontal carbon source distribution pipe network from a flow guide hole of the vertical carbon source anti-blocking pipe and finally directly enters a reaction area of the biological filter unit to provide a carbon source for denitrification reaction.
In the downward percolation process, the dissolved organic matters are finally decomposed and utilized by microorganisms, and organic nitrogen is converted into ammonia nitrogen through ammoniation. Newly generated and primary ammonia nitrogen is absorbed and intercepted by the filter material and is converted into nitrate nitrogen and a small part of nitrite nitrogen through nitrification. During the dry period, the underground infiltration unit is supplied with proper micro-power to ensure oxygen supply, form an aerobic zone and remove COD, BOD and NH4 +And decomposing the sludge. After the raw sewage is treated by the percolation layer and the fine filtration layer, most of other pollutants are removed except nitrogen which mainly exists in the form of nitrate nitrogen and phosphorus which cannot be adsorbed and precipitated after long-time operation.
Referring to fig. 4, the air flow direction between the first water scattering layer 303 and the second water scattering layer 305 and between the second water scattering layer 305 and the third water scattering layer 307 are opposite, and when the air flow pressure is higher, the air flow enters the percolation layer from the upper direction and the lower direction respectively.
The small-particle filter materials which are irregularly arranged are filled in the infiltration layer, when downward airflow passes through the filter materials, a round-table-shaped or nearly-conical flow beam with the radius gradually increasing from top to bottom is generally formed on the whole, and the flow rate gradually decreases along the direction of the radius increasing from top to bottom, when upward airflow passes through the filter materials, a round-table-shaped or nearly-conical flow beam with the radius gradually increasing from bottom to top is generally formed on the whole, and the direction of the radius increasing from bottom to top and the flow rate gradually decreasing from bottom to top, unidirectional airflow shows regular movement, and the movement of the airflow can be approximately regarded as laminar flow on the whole.
In the scheme, the bidirectional gas distribution is adopted, and the combined flow beam can be fully distributed on the filter material of the whole percolation layer, so that the contact area of the filter material and oxygen is increased, and the uniform gas distribution is realized; in addition, when the two air flows act and move simultaneously, fluid particles move irregularly and are mixed with each other, and the track is tortuous, so that a disordered form, namely the action of a turbulent phenomenon, is caused. A plurality of small vortexes, called turbulence, also called turbulent flow, turbulent flow or turbulent flow (disordered, mixed fluid particles, disordered movement and random movement elements) are formed in a flow field formed by the overlapped flow beam parts in two directions, so that air flow can fully contact with a filter material particle interface in a filter layer, and the filter material particle interface comprises a filter material air-facing surface and a filter material air-back surface (the surface facing the air flow is called the air-facing surface and the surface facing the air flow is called the air-back surface) in the filter layer, and the contact area of the filter material and oxygen is increased, so that the filter material in the filter layer can be fully contacted with the oxygen, and the oxidation reaction in the filter layer is accelerated; the infiltration treatment efficiency is improved, thereby improving the sewage treatment efficiency. In this embodiment, turbulent flows are formed inside the first and second percolators 304, 306, and both the air-facing side and the air-back side (the side facing the air flow is called the air-facing side and the side facing the air flow is called the air-back side) of the filter material inside the percolators can contact with air, so as to increase the contact area between the filter material and oxygen, so that the filter material inside the percolators can be fully contacted with oxygen, thereby accelerating the oxidation reaction inside the percolators; the infiltration treatment efficiency is improved, thereby improving the sewage treatment efficiency.
The total pressure of the inlet air is controlled by a blower, the inlet pressure of the pipeline of each layer of pipe network can be set to be a constant value through a pressure control valve, and the flow of the open holes is changed by controlling the number and the aperture of the open holes on the pipeline. The pressure is related to the resistance of the infiltration layer, the range of the airflow, the distance between the open pores and the thickness of the infiltration layer and can be obtained by calculation or experiments; in order to improve the turbulence effect, the flow velocity of the upward air flow and the flow velocity of the downward air flow are kept consistent, and the aperture and the distance of the holes in the upper direction and the lower direction on the same pipeline are the same under the condition of neglecting the self weight of the air.
When the air flow pressure fluctuates and is less than the pressure required by forming turbulent flow in a short time, one side of the infiltration layer, which is far away from the air source, is difficult to contact with air, the phenomenon of uneven air inlet inside the infiltration layer can be reduced by air inlet in two directions, and the infiltration system cannot be greatly influenced, so that the anti-interference performance of the infiltration system is improved; the oxygen in the third percolation layer 308 and the fine filtration layer 309 is provided by the superposition of the downward air flows of the first percolation layer 304, the second percolation layer 306 and the water distribution-air distribution pipe in the third percolation layer, and the waste gas is discharged through the exhaust pipes 312 positioned at the two sides of the bottom of the fine filtration layer 309.
Preferably, referring to fig. 3, in step 11, raw sewage is uniformly sprayed to the percolation layer in a multi-point shape through a pipe network buried in each of the water-dispersing layers; in step 22, the air flow is uniformly sprayed to the percolation layer in a multi-point shape through a pipe network buried in each of the water-dispersing layers. Preferably, the pipe network is arranged in a grid shape, and a plurality of injection holes are distributed in the direction facing the infiltration layer. Preferably, the system comprises at least three water-dispersing layers, and the pipe network of each water-dispersing layer is arranged according to the ratio of 1:1:1 water and gas distribution. The operation mode is that water is intermittently fed by a submersible sewage pump through a regulating distribution pool, water is fed for 6-8 times a day, the water is distributed by a first water distribution layer, a second water distribution layer and a third water distribution-air distribution layer according to the proportion of 1:1:1, and the water is fed into each layer for 4-5 cm each time. After the water inflow is finished for 30-60 minutes and the filter materials of the fine filtration layer above the exhaust pipe are dried, the first, second and third water distribution-air distribution layer pipes are used as ventilation pipes and are distributed according to the proportion of 1:1:1, fresh air uniformly enters the first, second and third water distribution-air distribution layers through the ventilation pipes, then the fresh air is transversely moved, the air of the first layer and the air of the third layer are mainly moved to the filter materials and the fillers of the lower layer, and the air of the second layer is moved to the filter materials and the fillers of the upper layer and the fillers of the lower layer; and simultaneously, the air with the reduced oxygen content in the filter material and the filler is finally discharged from the two exhaust pipes at the lower part of the underground infiltration unit, so that the oxygen supply to the filter material and the filler is completed.
Preferably, the step 1 comprises:
referring to fig. 2, in step 101, raw sewage is pretreated by a pretreatment unit (i.e., a sewage pretreatment tank 100); carrying out grid precipitation on raw sewage to remove granular sludge and carrying out anaerobic pretreatment;
step 102, enabling the pretreated sewage to enter a sewage adjusting and distributing tank 200;
103, intermittently feeding the water into each water dispersing layer through conveying equipment; the sewage conveying equipment comprises a sewage pump 201 and the like, is used for conveying the sewage in the sewage adjusting and distributing tank 200 to each water scattering layer, and can adopt a plurality of submersible pumps for conveying at the same time in order to improve the efficiency when the water scattering layer is large in area; conveying the sewage into an underground infiltration unit at regular time by a sewage submersible pump arranged in a regulating and distributing tank;
referring to fig. 3, step 11, raw sewage flows through each water-dispersing layer from outside to inside respectively;
when the area of the water scattering layer is larger, the sewage can flow from the edge of the water scattering layer to the center of the water scattering layer through a plurality of water inlets, so that the sewage infiltration flow speed and the infiltration treatment efficiency are improved; specifically, a plurality of water inlets can be arranged on a pipe network in the interior of the water dispersion layer, and water is respectively fed from different directions at the outer edge of the pipe network, specifically referring to fig. 6, when sewage enters a water distribution-air distribution pipe network (grid-shaped) in each water dispersion layer through a connecting pipe of the water inlets, the sewage respectively enters the water distribution-air distribution pipe network from the middle point P, Q of the two pipes in the length direction, water is fed from two directions simultaneously, and the uniformity of water feeding and water distribution is improved;
step 12, infiltrating the sewage from each water-dispersing layer downwards or downwards and into infiltration layers which are arranged at intervals with each water-dispersing layer from two sides respectively for multiple times of infiltration;
the spraying holes formed in each pipeline of the pipe network in the first water dispersing layer 303 face to two sides and downwards respectively, the spraying holes on the two sides are used for water to flow in the plane where the first water dispersing layer is located, and the downwards spraying holes are used for water to flow to the first percolation layer;
the spray holes arranged on each pipeline of the pipe network in the second water dispersing layer 305 face to two sides, upwards and downwards respectively, the spray holes on the two sides are used for water to flow in the plane where the second water dispersing layer is located, and the downwards spray holes are used for water to flow in the second percolation layer;
the spray holes arranged on each pipeline of the pipe network in the third water-dispersing layer 307 face to two sides, upwards and downwards respectively, the spray holes on the two sides are used for water to flow in the plane where the third water-dispersing layer is located, and the downwards spray holes are used for water to flow to the third percolation layer and the fine filtration layer;
and step 13, performing final percolation, and then performing fine filtration in a fine filtration layer. Most of the contaminants are removed during the infiltration process.
Preferably, the step 2 includes:
step 202, starting temperature control equipment 315-2 to regulate and control the temperature of the wind sent into each water-dispersing layer according to the environment temperature of the air supply equipment; the temperature required by air supply can be calculated according to the ambient temperature of the air supply equipment and the temperature environment (preset value) required by maintaining microorganisms, and then the ambient temperature of the air supply equipment is adjusted to the temperature required by air supply;
step 203, intermittently feeding the air adjusted to the preset temperature into each water-dispersing layer through air supply equipment;
during the dripping-off period, a suitable amount of ventilation is provided to ensure the oxygen supply to the subsurface infiltration unit, and the aerated air is suitably warmed at low temperature to maintain the activity of the microorganisms.
Step 21, after water inflow is finished, starting air supply equipment after sewage in each water scattering layer is dried;
starting an air supply device after the filter material of the fine filtering layer above the exhaust pipe is dried after 30-60 minutes of water inlet is finished;
22, allowing the airflow to flow through the water dispersing layers from outside to inside respectively;
referring to fig. 4, when the area of the water dispersion layer is large, the water flows from the edge of the water dispersion layer to the center of the water dispersion layer through a plurality of air inlets, so that the air supply flow rate and the infiltration treatment efficiency are improved; specifically, a plurality of air inlets connected with air supply equipment can be arranged on a pipe network in the water dispersion layer, and air is respectively supplied from different directions at the outer edge of the pipe network, specifically referring to fig. 6, when air flow enters a water distribution-air distribution pipe network (grid shape) in each water dispersion layer through a connecting pipeline of a water inlet, the air flow enters the water distribution-air distribution pipe network from the middle point P, Q of two pipelines in the length direction, air is supplied in two directions simultaneously, the uniformity of water supply and distribution is increased, and the uniformity of air supply and distribution is increased;
and step 23, in order to ensure the uniformity of water distribution and air distribution, the air flow flows through the infiltration layers which are arranged at intervals between the water distribution layers from the water distribution layers upwards, downwards and towards the two sides respectively.
The spraying holes formed in each pipeline of the pipe network in the first water dispersing layer 303 face to two sides, upward and downward respectively, the spraying holes on the two sides are used for air to flow in the plane where the first water dispersing layer is located, the downward spraying holes are used for air to flow to the first percolation layer 304, and the upward spraying holes are used for air to flow upward in the first water dispersing layer and flow downward in the opposite direction after being blocked by the root blocking-sealing layer;
the injection holes formed in each pipeline of the pipe network inside the second water dispersion layer 305 face to two sides, upward and downward respectively, the injection holes on the two sides are used for air to flow in the plane where the second water dispersion layer is located, the upward injection holes are used for air to flow to the first percolation layer 304 (because the water flow pressure is small, the upward flow is difficult to overcome the gravity, the air pressure is relatively large, the gravity is small, the upward flow can be overcome the gravity), and the downward injection holes are used for air to flow to the second percolation layer 306;
the jet holes formed on each pipeline of the pipe network inside the third water-dispersing layer 307 face to two sides, upward and downward respectively, the jet holes on the two sides are used for air to flow in the plane where the third water-dispersing layer is located, the upward jet holes are used for air to flow to the second percolation layer 306 (because the water flow pressure is small, the upward flow is difficult to overcome the gravity, the air pressure is relatively large, the gravity is small, the upward flow can be overcome the gravity), and the downward jet holes are used for air to flow to the third percolation layer 308 and the fine filtration layer;
intermittently feeding water by a submersible sewage pump through a regulating distribution pool for 6-8 times a day, distributing the water by a first water distribution-air distribution layer, a second water distribution-air distribution layer and a third water distribution-air distribution layer according to the proportion of 1:1:1, and feeding water into each layer by 4-5 cm each time. After the water is fed for 30-60 minutes and the filter materials of the fine filtration layer above the exhaust pipe are dried, the first, second and third water-air distribution layer pipes are used as ventilation pipes and are distributed according to the proportion of 1:1:1, fresh air uniformly enters the first, second and third water-air distribution layers through the ventilation pipes, then the fresh air is mainly transported to the filter materials and the fillers at the lower layer except for being laterally transported, and meanwhile, the air with the reduced oxygen content in the filter materials and the fillers is finally discharged from two exhaust pipes 312 at the lower part of the underground infiltration unit, so that the oxygen supply to the filter materials and the fillers is completed.
Preferably, the step 3 comprises:
step 31, mixing the finely filtered sewage with raw sewage uniformly entering a carbon source layer 401 through a carbon source pipe network;
the raw sewage introduced through the carbon source pipe provides a carbon source for denitrification reaction. Vertical carbon source anti-blocking pipes 305-2 are arranged in three percolation layers of the underground percolation unit, a carbon source pipe network is embedded in a carbon source layer 401 and is in a grid shape, the carbon source pipe network can downwards penetrate through the carbon source layer 401 in the horizontal direction and enter a denitrification and dephosphorization layer of a reaction area 403, a carbon source is provided for denitrification reaction, the stability of the wet/dry ratio of the system is ensured, and the underground percolation unit is effectively prevented from being blocked; a horizontal carbon source distribution pipe 402 is arranged on a carbon source layer of the biological filter unit, so that the good denitrification capability of the system is ensured; the long-term stable and efficient operation of the system is realized, so that various indexes of the system water outlet can stably reach or exceed the GB18918-2002 class A emission standard for a long time.
Step 32, entering the reaction zone 403 downwards for denitrification reaction;
the water rich in nitrate nitrogen and the raw sewage introduced by the vertical carbon source anti-blocking pipe 305-2 are mixed by the horizontal carbon source pipe 402 in the carbon source layer 401 of the biological filter and then are percolated downwards together into an aerobic-anaerobic alternative area, at the moment, the infiltration line of the area is correspondingly increased by about 10cm, and in the aerobic and anaerobic states, the organic matters in the raw sewage are mainly used for denitrification reaction and are not decomposed by aerobic microorganisms;
in step 32A, the water above the carbon source layer 401 flows back into the sewage adjusting and distributing tank 200 through the return pipe 314.
The organic matters which are not utilized are decomposed and converted under the aerobic condition, and the blockage caused by accumulation can not be caused. The sewage which enters the horizontal carbon source distribution pipe through the vertical carbon source anti-blocking pipe directly enters the biological filter unit. Along with the long-term operation of the system under the higher load condition, the permeability of each percolation layer in the ground filtration unit is slowly reduced, and the water quantity entering the biological filter through the vertical carbon source anti-blocking pipe is gradually increased, so that the sewage load born by the ground filtration unit is automatically fed back and adjusted, the wet/dry ratio of the ground filtration unit is basically stable, the long-term stable operation of the system is ensured, and the impact load resistance capability is stronger. In addition, the water rich in nitrate and nitrogen automatically flows into the regulating and distributing tank through the return pipe, and the waste water after aerobic underground infiltration treatment contains a small amount of dissolved oxygen and a large amount of nitrate, and the nitrate is formed by oxidizing ammonia nitrogen adsorbed in the previous water inlet process, so that the dominant bacteria in the regulating and distributing tank are heterotrophic denitrifying bacteria, and under the action of the heterotrophic denitrifying bacteria, N0 is used3 —N is used as electron acceptor and organic carbon in waste water as electron donor to react with N03 —N-N reduction2Simultaneously, the COD of the wastewater of the regulating and distributing tank is reduced, and organic carbon is oxidized into CO2And residual organic matters in the wastewater are further removed while denitrification is realized, the wastewater enters a completely saturated zone after passing through the aerobic and anaerobic alternate zone, and the anaerobic zone provides an excellent living environment for anaerobic bacteria and facultative bacteria, so that further proceeding of denitrification reaction is ensured.
Step 33, the denitrified water is purified and discharged through the water collecting and discharging layer 404; a groove-shaped water collecting pipe 405-1 is embedded in the water collecting and draining layer 404, and finally, the water is drained out through a water draining outlet 405-2 under the action of water pressure through a water draining pipe 405;
the biological filter is filled with a main filler consisting of siliceous and irony crushed stones with the particle size of 5-10 mm, and also comprises an additional filler which is 5-10% by volume and mainly consists of plant branches and leaves, rice husks and calcium, the mixed fillers are submerged (saturated) by water, the oxygen supply is limited, and thus a facultative anaerobic environment is formed. NO formed by nitrification of water rich in nitrate and nitrogen3 —(Small amount of NO)2 —) Can be converted into N by denitrification under the condition of facultative anaerobic environment of advanced treatment2So as to achieve the aim of denitrification.
The organic carbon source needed by the denitrification reaction is partially from raw sewage of a carbon source pipe of the ground filter unit, plant branches and leaves and rice husks, and in addition, the bioactive components (plant branches and leaves, rice husks and the like) in the filler are the parasitic places of microorganisms and also supplement the organic carbon source for promoting the denitrification reaction. The reaction zone of the biological filter is filled with a mixture of calcium-containing and iron-containing materials and gravel, so as to further introduce residual PO into the reaction zone4 —The phosphate is further removed by adsorption, surface reaction and precipitation. In conclusion, the invention realizes the coupling synergistic effect between the underground infiltration unit and the biological filter treatment unit by organically combining the underground infiltration aerobic treatment and the biological filter treatment facultative anaerobic treatment.
And step 34, sterilizing the water after the water meets the emission standard so as to supply the urban general water.
The sewage treatment system occupies an area of 50m2The hydraulic load of the system is 100cm/d, and water is fed 8 times per day. The test sewage is domestic sewage of a Changsha copper official kiln research center, the concentration ranges of COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the treated effluent are respectively 13.2mg/L, 3.6mg/L, 1.43mg/L, 3.29mg/L and 0.04mg/L through detection and analysis of a third-party detection mechanism, and the treated effluent meets the first-class A discharge standard in the pollutant discharge standard (GB18918-2002) of a national urban sewage treatment plant. Is especially suitable for treating small-scale domestic sewage in urban districts, small towns and rural areas, has low construction cost, low operation cost and less than 0.1 yuan per ton of sewage treatment cost, and the treated sewage is completely full of chlorine-added disinfectionThe water quality standard of urban miscellaneous water.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A high-load ecological sewage filtering treatment method is characterized by comprising the following steps:
step 1, raw sewage respectively flows in a spreading manner from different heights in the horizontal plane direction through a plurality of water-dispersing layers arranged up and down, and simultaneously downwards sequentially passes through a percolation layer and a fine filtration layer for infiltration treatment;
step 2, after the raw sewage is fed, and sewage of each water dispersing layer is dried, air is uniformly distributed at multiple points in the horizontal plane direction and the direction vertical to the horizontal plane from different heights through each water dispersing layer, air flow passes through the percolation layer and the fine filtration layer, and waste gas is discharged from an exhaust hole at the bottom of the fine filtration layer at the bottommost layer; the air flow directions perpendicular to the horizontal plane direction between at least two adjacent water-dispersing layers are opposite and staggered with each other, and turbulent flow is formed inside the percolation layer positioned between the two adjacent water-dispersing layers;
step 3, discharging the sewage after the biochemical reaction in the infiltration layer and the fine filtration layer and the infiltration treatment in the biological filter unit, which comprises the following steps:
31, mixing the finely filtered sewage with raw sewage uniformly distributed into a carbon source layer through a carbon source pipe network;
raw sewage introduced through a carbon source pipe network provides a carbon source for denitrification reaction; the carbon source pipe network is embedded in the carbon source layer and is in a grid shape, and the raw sewage can downwards permeate the carbon source layer in the horizontal direction and enter the denitrification and dephosphorization layer of the reaction zone; arranging a horizontal carbon source distribution pipe on a carbon source layer of the biological filter unit; when sewage which is not percolated in time meets a vertical carbon source anti-blocking pipe penetrating through a percolation layer, the sewage enters a horizontal carbon source distribution pipe network from a flow guide hole of the vertical carbon source anti-blocking pipe and finally directly enters a reaction area of a biological filter unit to provide a carbon source for denitrification reaction;
step 32, entering the reaction zone downwards for denitrification reaction;
the water rich in nitrate nitrogen after being treated by the percolation layer and the fine filtration layer and the raw sewage introduced by the vertical carbon source anti-blocking pipe are mixed in the carbon source layer of the biological filter through the horizontal carbon source pipe and then percolated downwards together into an aerobic-anaerobic alternate zone, the infiltration line of the zone is correspondingly increased by 10cm, and in the aerobic and anaerobic states, organic matters in the raw sewage introduced by the vertical carbon source anti-blocking pipe are used for denitrification reaction; the biological filter is filled with a main filler consisting of siliceous and irony crushed stones with the particle size of 5-10 mm and an additional filler consisting of plant branches and leaves, rice husks and calcium with the volume ratio of 5-10%; the mixed fillers are submerged by water, and the oxygen supply is limited, so that a facultative anaerobic environment is formed; NO formed by nitrification of water rich in nitrate and nitrogen3 —Conversion to N by denitrification in an advanced treatment facultative anaerobic environment2The aim of denitrification is achieved;
step 33, the denitrified water is purified and discharged through a water collecting and discharging layer; a groove-shaped water collecting pipe is embedded in the water collecting and draining layer, and finally the water is drained through a water draining outlet under the action of water pressure through a water draining pipe;
and step 34, sterilizing the water after the water meets the emission standard so as to supply the urban general water.
2. The high-load ecological filtered wastewater treatment method as set forth in claim 1, wherein said step 1 comprises:
step 11, raw sewage flows through each water-dispersing layer from outside to inside respectively;
step 12, respectively permeating the water dispersing layers downwards and from two sides of each water dispersing layer into each water dispersing layer and the percolation layers arranged at intervals with each water dispersing layer;
and step 13, allowing the filtrate to pass through the filtration layer at the bottommost layer and then enter a fine filtration layer for fine filtration.
3. The high-load ecological filtered wastewater treatment method as set forth in claim 2, wherein said step 2 comprises:
step 21, after water inflow is finished, starting air supply equipment after sewage of each water scattering layer is dried;
22, allowing the airflow to flow through the water dispersing layers from outside to inside respectively;
and 23, respectively flowing through the percolation layers which are arranged at intervals with the water dispersion layers downwards and to the two sides in a radial shape from the water dispersion layers.
4. The high-load ecological filtered sewage treatment method according to claim 1, wherein in the step 1, raw sewage is uniformly permeated into the percolation layer in a multi-point shape through a pipe network buried in each layer of the water dispersion layer;
in the step 2, the airflow is uniformly sprayed to the percolation layer in a multi-point shape through a pipe network embedded in each water-dispersing layer.
5. The high-load ecological filtered sewage treatment method of claim 4, wherein said pipe network is arranged in a grid-like manner and a plurality of injection holes are arranged in four directions of upward, downward, leftward and rightward.
6. The high-load ecological filtered sewage treatment method of claim 4, comprising at least three water-dispersing layers, wherein the pipe network of each water-dispersing layer is arranged according to a ratio of 1:1:1 water and gas distribution.
7. The high-load ecological filtered wastewater treatment method as set forth in claim 2, further comprising, before said step 11:
101, pretreating raw sewage by a pretreatment unit;
step 102, enabling the pretreated sewage to enter a regulating and distributing tank;
and 103, intermittently feeding the water into each water dispersing layer through conveying equipment.
8. The high-load ecological filtered water treatment method of claim 3, further comprising, before said step 21:
step 201, detecting the ambient temperature of air supply equipment;
step 202, starting temperature control equipment to regulate and control the temperature of the air sent into each water-dispersing layer according to the environment temperature of the air supply equipment;
and 203, intermittently feeding the air adjusted to the preset temperature into each water dispersing layer through air supply equipment.
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| CN106006962A (en) * | 2016-05-18 | 2016-10-12 | 上海立泉环境科技有限公司 | Biological aerated filter device |
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| CN106006962A (en) * | 2016-05-18 | 2016-10-12 | 上海立泉环境科技有限公司 | Biological aerated filter device |
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