Comprehensive treatment system for tail water of sewage plant

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a comprehensive treatment system for tail water of a sewage plant. The device comprises a multi-unit pretreatment tank, a plurality of units and a plurality of units, wherein the multi-unit pretreatment tank is connected with tail water of a sewage plant; the constructed wetland is connected with water discharged by the multi-unit pretreatment pool; and the multi-unit pretreatment pool is 50-100cm higher than the constructed wetland. The constructed wetland is used for solving the technical problem that the constructed wetland in the prior art is easy to block.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sewage treatment, specifically relates to a sewage plant tail water comprehensive treatment system. BACKGROUND

[0002] In the sewage treatment plant tail water treatment, the artificial wetland utilizes the physical, chemical, biological triple synergies of substrate, plant, microorganism to make the sewage purified. The artificial wetland can be divided into surface flow artificial wetland and subsurface flow artificial wetland, and the subsurface flow artificial wetland is favored because of high filling utilization rate, relatively small land occupation and strong processing capacity, but compared with the surface flow artificial wetland, the subsurface flow artificial wetland is more prone to clogging.

[0003] After the wetland is clogged, the artificial wetland can exist around flow or even short flow phenomenon. The porosity reduces, the percolation speed slows down, the hydraulic load reduces, and the sewage that cannot be discharged continuously accumulates on the surface of the wetland, causes the stench and mosquito breeding problem, and influences the environmental health. The water accumulation also blocks the oxygen exchange between the inside and outside of the substrate, causes the activity of the aerobic microorganism in the system to reduce, and then reduces the removal rate of pollutants, so that the effluent cannot reach the design standard. The clogging problem of the artificial wetland shortens its service life, not only causes the great waste of resources and land, but also restricts the popularization of the wetland process.

[0004] In order to solve the problem of wetness clogging, the prior art generally has two methods, one is to update the filler, and the shortcoming is high economic cost, and the other method is backwashing, but actually the effect of backwashing is not ideal, and the expected goal cannot be achieved. CONTENT OF THE UTILITY MODEL

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, and provide a sewage plant tail water comprehensive treatment system for solving the technical problem that the artificial wetland is prone to clogging in the prior art.

[0006] The technical scheme for solving the above technical problem of the utility model is as follows: a sewage plant tail water comprehensive treatment system, comprising:

[0007] A multi-unit pretreatment tank, the multi-unit pretreatment tank is connected with sewage plant tail water;

[0008] An artificial wetland, the artificial wetland is connected with the water discharged from the multi-unit pretreatment tank;

[0009] The multi-unit pretreatment tank is 50-100cm higher than the artificial wetland.

[0010] The utility model pretreats the sewage plant tail water through the multi-unit pretreatment tank, reduces the pollutant content in the sewage plant tail water, thereby reducing the processing intensity of the artificial wetland, and achieving the purpose of prolonging the service life of the artificial wetland.

[0011] Further, the multi-unit pretreatment pool comprises at least two pretreatment pools.

[0012] Each of the two ends of the pretreatment pool is respectively provided with an inlet channel and an outlet channel.

[0013] Each of the inlet channels is connected to the tail water of the sewage plant through an inlet pipe, a plurality of the inlet pipes are communicated with the tail water discharge pipe of the sewage plant, and a valve is arranged on each of the inlet pipes.

[0014] Each of the pretreatment pools is sequentially provided from bottom to top with a plain soil tamping layer, a 500mm pebble layer, a 400mm gravel C layer, a 400mm gravel B layer and a 300mm gravel A layer, and a mud flushing groove is further arranged on the plain soil tamping layer.

[0015] The pebble layer is composed of pebbles with a particle size of 16-32mm, the gravel C layer is composed of gravels with a particle size of 20-30mm, the gravel B layer is composed of gravels with a particle size of 5-15mm, and the gravel A layer is composed of gravels with a particle size of 5-10mm.

[0016] The beneficial effect of the present step is that the tail water of the sewage plant is filtered and adsorbed through the multi-layer structure to reduce the content of pollutants in the tail water.

[0017] Further, the pebble layer is provided with a first aeration pipe, a first air inlet blind pipe and a first water inlet blind pipe.

[0018] The gravel C layer and the gravel B layer are respectively provided with a flushing pipe.

[0019] The beneficial effect of the present step is that the interior is cleaned by aeration and water flushing.

[0020] Further, a mud discharge pipe is further arranged in the outlet channel.

[0021] The beneficial effect of the present step is that the cleaned sludge is discharged through the mud discharge pipe.

[0022] Further, the mud discharge pipe is communicated with a sludge treatment subsystem, and the sludge treatment subsystem comprises a sludge sedimentation tank, a sludge thickening device and a sludge dewatering device arranged in sequence.

[0023] The beneficial effect of the present step is that the sludge is dewatered to obtain sludge blocks with low water content; since the sludge blocks contain various organic matters, they can be used as fuel for sludge power generation.

[0024] Further, the bottom of the artificial wetland is a concrete layer, and a 200mm gravel D layer, a 400mm gravel E layer, a 400mm volcanic rock layer and a 300mm zeolite layer are sequentially arranged above the concrete layer from bottom to top.

[0025] The gravel D layer is composed of gravel with a particle size of 40-50mm, the gravel E layer is composed of gravel with a particle size of 20-30mm, the volcanic rock layer is composed of volcanic rock with a particle size of 30-50mm, and the zeolite layer is composed of zeolite with a particle size of 20-30mm.

[0026] The beneficial effect of the present step is that the pretreated tail water is further harmlessly treated by the zeolite and volcanic rock with strong adsorption capacity.

[0027] Further, the gravel D layer is further provided with a second aeration pipe, a second air inlet blind pipe and a second water inlet blind pipe.

[0028] The beneficial effect of the present step is that the biological membrane and other impurities are removed by aeration and flushing, thereby prolonging the service life of the constructed wetland.

[0029] Further, the bottom surface of the pretreatment tank and the constructed wetland is provided with at least one V-shaped slope, and the bottom of the V-shaped slope is provided with a sludge flushing groove.

[0030] The top surface of the sludge flushing groove is provided with a cover plate, and the cover plate is provided with mesh holes.

[0031] The beneficial effect of the present step is that the slope can guide the internal water flow to collect in the sludge flushing groove, thereby facilitating the emptying of sewage.

[0032] The beneficial effect of the present application is:

[0033] 1. The present application adds a multi-unit pretreatment tank between the sewage plant and the constructed wetland, which can effectively reduce the content of various pollutants in the tail water of the sewage plant by using the multi-unit pretreatment tank, thereby reducing the purification load of the constructed wetland and effectively prolonging the service life of the constructed wetland.

[0034] 2. The multi-unit pretreatment tank has a plurality of pretreatment tanks, which can be used intermittently without affecting the normal uninterrupted operation of the sewage plant, thereby continuously pretreating the tail water of the sewage plant.

[0035] 3. The filler used in the pretreatment tank is low in price and low in construction cost. DETAILED DESCRIPTION

[0036] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0037] Figure 1The utility model provides a kind of process schematic diagram of sewage plant tail water comprehensive treatment system provided by the utility model;

[0038] Figure 2 The utility model provides a kind of structure schematic diagram of pretreatment pool in sewage plant tail water comprehensive treatment system provided by the utility model;

[0039] Figure 3 The utility model provides a kind of structure schematic diagram of artificial wetland in sewage plant tail water comprehensive treatment system provided by the utility model;

[0040] Figure 4 The utility model provides a kind of flow schematic diagram of sludge treatment subsystem in sewage plant tail water comprehensive treatment system provided by the utility model.

[0041] Reference signs:

[0042] 1-sewage plant tail water;2-multiple unit pretreatment pool;3-artificial wetland;4-sludge treatment subsystem;

[0043] 21-pretreatment pool;31-concrete layer;32-gravel E layer;33-gravel D layer;34-volcanic rock layer;35-zeolite layer;36-second water inlet blind pipe;41-sludge sedimentation tank;42-sludge thickening device;43-dosing box;44-sludge dewatering device;

[0044] 211-water inlet channel;212-water outlet channel;213-plain soil rammed layer;214-pebble layer;215-gravel C layer;216-gravel B layer;217-gravel A layer;218-first water inlet blind pipe;219-flushing pipe 219;311-sludge discharge flushing groove;

[0045] 2121-sludge discharge pipe. DETAILED DESCRIPTION

[0046] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, so only as an example, and cannot limit the protection scope of the utility model.

[0047] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meaning understood by the skilled person in the field of the utility model.

[0048] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] Embodiment

[0053] As Figure 1 shown, the sewage plant tail water 1 comprehensive treatment system provided by the present application comprises:

[0054] The multi-unit pretreatment tank 2 is connected to the sewage plant tail water 1.

[0055] The artificial wetland 3 is connected to the water discharged from the multi-unit pretreatment tank 2.

[0056] The multi-unit pretreatment pool 2 is higher than the artificial wetland 3 by 50-100 cm, and the sewage can flow under the influence of gravity without additional power consumption by using the height difference between the two.

[0057] The utility model discloses a multi-unit pretreatment pool 2 is used for pretreating the tail water 1 of sewage plant, reduces the pollutant content in the tail water 1 of sewage plant, thereby alleviating the processing intensity of artificial wetland 3, and the purpose of prolonging the service life of artificial wetland 3 is achieved.

[0058] On the basis of the above technical scheme, the multi-unit pretreatment pool 2 includes at least two pretreatment pools 21, which can achieve the purpose of one for use and one for standby, and the processing capacity of a single pretreatment pool 21 can meet the daily processing capacity of the tail water 1 of sewage plant; in combination with the first aeration pipe, the first air inlet blind pipe and the first water inlet blind pipe 218 mentioned below, the standby pretreatment pool 21 can be cleaned when the tail water 1 of sewage plant is not pretreated, and internal impurities can be removed, and at this time, the pretreatment pool 21 in the other use state does not affect the normal use of the subsequent artificial wetland 3;

[0059] Each of the pretreatment pools 21 is respectively provided with a water inlet channel 211 and a water outlet channel 212 at two ends;

[0060] Each of the water inlet channels 211 is connected to the tail water 1 of the sewage plant through a water inlet pipe, a plurality of the water inlet pipes are communicated with a tail water discharge pipe of the sewage plant, and a valve is arranged on each of the water inlet pipes, so that the selection of the pretreatment pool 21 can be realized by controlling the opening and closing of the valve;

[0061] Each of the pretreatment pools 21 is sequentially provided with a plain soil tamping layer 213, a 500mm pebble layer 214, a 400mm gravel C layer 215, a 400mm gravel B layer 216 and a 300mm gravel A layer 217 from bottom to top, and a mud flushing groove is further formed in the plain soil tamping layer 213;

[0062] The pebble layer 214 is composed of pebbles with a particle size of 16-32mm, the gravel C layer 215 is composed of gravels with a particle size of 20-30mm, the gravel B layer 216 is composed of gravels with a particle size of 5-15mm, and the gravel A layer 217 is composed of gravels with a particle size of 5-10mm.

[0063] The filler of the pretreatment pool 21 is low in price and low in construction cost, and the multi-layer structure is used for filtering and adsorbing the tail water 1 of the sewage plant, so as to reduce the pollutant content of the tail water.

[0064] 1. The suspended solids are reduced from 10 FTU to 6 FTU, the colloid is removed, and the transparency is improved;

[0065] 2. The total inorganic phosphorus is reduced, and the reduction range is from 0.4mg / L to below 0.25mg / L;

[0066] 3. Harmful algae are removed, turbidity is reduced from 40 FTU to 15 FTU, permanganate index is reduced by more than 30%;

[0067] 4. Anions, petroleum index and fluorides are improved;

[0068] 5. Ammonia nitrogen is reduced from 2 mg / L to about 1.5 mg / L;

[0069] 6. Total nitrogen, COD and BOD that are not dissolved in water are removed;

[0070] 7. More than 50% of unknown pollutants and new types of refractory organic pollutants in tail water of industrial wastewater treatment plants are removed.

[0071] On the basis of the above technical scheme, the pebble layer 214 is provided with a first aeration pipe, a first air inlet blind pipe and a first water inlet blind pipe 218.

[0072] The gravel C layer 215 and the gravel B layer 216 are respectively provided with a flushing pipe 219, which can be arranged at multiple angles and can be arranged between the side surface and the bottom surface of the pretreatment tank 21 and the filler layer, so that the flushing range is larger and the cleaning effect is better.

[0073] The interior is cleaned and treated by aeration and water flushing, prolonging the service life of the filler.

[0074] On the basis of the above technical scheme, the effluent channel 212 is further provided with a sludge discharge pipe 2121.

[0075] The sludge discharged by cleaning is discharged through the sludge discharge pipe 2121.

[0076] On the basis of the above technical scheme, the sludge discharge pipe 2121 is communicated with a sludge treatment subsystem 4, and the sludge treatment subsystem 4 comprises a sludge sedimentation tank 41, a sludge thickening device 42 and a sludge dewatering device 44 arranged in sequence. Figure 4 In the sludge treatment subsystem 4, the slurry in the sludge sedimentation tank is pumped into the sludge thickening device 42 by a slurry pump, and the supernatant of the sludge thickening device 42 is discharged, and then the thickened sludge is sent to the sludge dewatering device 44. In the conveying process, a medicament is added to the sludge by a medicament adding tank 43 to accelerate dewatering into blocks.

[0077] The sludge is dewatered and treated, and finally a sludge block with low water content is obtained; since the sludge block contains various organic matters, it can be used as fuel for sludge power generation.

[0078] On the basis of the above technical scheme, the bottom of the artificial wetland 3 is a concrete layer 31, and a 200mm gravel D layer 33, a 400mm gravel E layer 32, a 400mm volcanic rock layer 34 and a 300mm zeolite layer 35 are sequentially arranged above the concrete layer 31 from bottom to top.

[0079] The gravel D layer 33 is composed of gravel with a particle size of 40-50mm, the gravel E layer 32 is composed of gravel with a particle size of 20-30mm, the volcanic rock layer 34 is composed of volcanic rock with a particle size of 30-50mm, and the zeolite layer 35 is composed of zeolite with a particle size of 20-30mm.

[0080] The tail water after pretreatment is further harmlessly treated by the zeolite and the volcanic rock with strong adsorption capacity.

[0081] On the basis of the above technical scheme, the gravel D layer 33 is further provided with a second aeration pipe, a second air inlet blind pipe and a second water inlet blind pipe 36.

[0082] Impurities such as biological membranes are removed by aeration and flushing, thereby prolonging the service life of the artificial wetland 3.

[0083] On the basis of the above technical scheme, the bottom surface of the pretreatment pool 21 and the artificial wetland 3 is provided with at least one V-shaped slope, and the bottom of the V-shaped slope is provided with a sludge discharge flushing groove 311.

[0084] The top surface of the sludge discharge flushing groove 311 is provided with a cover plate, and the cover plate is provided with mesh holes. A flushing pipe 219 can also be arranged in the sludge discharge flushing groove 311.

[0085] The slope can guide the internal water flow to converge in the sludge discharge flushing groove 311, thereby facilitating the emptying of sewage.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A system for the integrated treatment of wastewater from a sewage plant, characterized in that, The utility model relates to a sewage treatment system, comprising: a multi-unit pretreatment pool connected to tail water of a sewage plant; a constructed wetland connected to water discharged from the multi-unit pretreatment pool; the multi-unit pretreatment pool is 50-100 cm higher than the constructed wetland; the multi-unit pretreatment pool comprises at least two pretreatment pools; each of the pretreatment pools is provided with an inlet channel and an outlet channel at two ends respectively; each of the inlet channels is connected to tail water of the sewage plant through an inlet pipe, a plurality of the inlet pipes are communicated with a tail water discharge pipe of the sewage plant, and a valve is arranged on each of the inlet pipes; each of the pretreatment pools is sequentially provided with a plain soil tamping layer, a 500 mm pebble layer, a 400 mm gravel C layer, a 400 mm gravel B layer and a 300 mm gravel A layer from bottom to top, and a sludge flushing groove is further arranged on the plain soil tamping layer; the pebble layer is composed of pebbles with a particle size of 16-32 mm, the gravel C layer is composed of gravels with a particle size of 20-30 mm, the gravel B layer is composed of gravels with a particle size of 5-15 mm, and the gravel A layer is composed of gravels with a particle size of 5-10 mm.

2. The system for comprehensive treatment of tail water from a sewage plant according to claim 1, characterized in that, the pebble layer is provided with a first aeration pipe, a first air inlet blind pipe and a first water inlet blind pipe; the gravel C layer and the gravel B layer are respectively provided with flushing pipes.

3. The wastewater plant tail water integrated treatment system of claim 1, wherein the outlet channel is further provided with a sludge discharge pipe.

4. The system for comprehensive treatment of tail water from a sewage plant according to claim 3, characterized in that, the sludge discharge pipe is communicated with a sludge treatment subsystem, and the sludge treatment subsystem comprises a sludge sedimentation tank, a sludge thickening device and a sludge dewatering device arranged in sequence.

5. The wastewater plant tail water integrated treatment system of claim 1, wherein, the bottom of the constructed wetland is a concrete layer, and a 200 mm gravel D layer, a 400 mm gravel E layer, a 400 mm volcanic rock layer and a 300 mm zeolite layer are sequentially arranged above the concrete layer from bottom to top; the gravel D layer is composed of gravels with a particle size of 40-50 mm, the gravel E layer is composed of gravels with a particle size of 20-30 mm, the volcanic rock layer is composed of volcanic rocks with a particle size of 30-50 mm, and the zeolite layer is composed of zeolites with a particle size of 20-30 mm.

6. The system for comprehensive treatment of tail water from a sewage plant according to claim 5, characterized in that, the gravel D layer is further provided with a second aeration pipe, a second air inlet blind pipe and a second water inlet blind pipe.

7. The wastewater plant tailwater integrated treatment system of claim 1, wherein, the bottom surface of the pretreatment pool and the constructed wetland is provided with at least one V-shaped slope, and the bottom of the V-shaped slope is provided with a sludge flushing groove; the top surface of the sludge flushing groove is provided with a cover plate, and the cover plate is provided with mesh holes.

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