CN207726821U - A kind of sewage treatment plant tail water artificial wet land treating system - Google Patents
A kind of sewage treatment plant tail water artificial wet land treating system Download PDFInfo
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model provides a kind of sewage treatment plant tail water artificial wet land treating system, includes at least shallow water multistage drop canal, artificial combination unit wetland, current wetland and biological stabilization pond；The shallow water multistage drop canal includes water channel and multistage drop dam, the artificial combination unit wetland includes aerobic nitrification area, anoxic denitrification area and settling zone, the current wetland includes inlet channel, microbial reaction area, wetland plant and outlet canal, the biological stabilization pond is equipped with aquatic plant system and aquatic animal system, sewage is successively by shallow water multistage drop canal, artificial combination unit wetland, current wetland and biological stabilization pond, evergreen eel grass and emergent aquactic plant are downgraded in plantation in the shallow water multistage drop canal, the aerobic nitrification area and anoxic denitrification area of the artificial combination unit wetland are intervally arranged several microorganisms growth base units, current wetland microbial reaction area is from top to bottom, the lime stone of grain size from small to large, volcanic rock and gravel.
Description
Technical Field
The utility model relates to a water pollution administers the field, especially is used for constructed wetland processing system that sewage treatment plant tail water was handled.
Background
The tail water of the sewage treatment plant is directly discharged into the nearby water body, so that the quality of regional water environment is damaged, and the living environment of people is threatened directly. After the construction of the tail water advanced treatment project is implemented, the tail water advanced treatment method has important significance for relieving the pressure of the supply and demand of tap water in the gathering area and improving the quality of life of the masses.
The traditional artificial wetland system can degrade pollutant substances by the good purification effect of a stable ecological system consisting of soil, microorganisms and plants, and provides treatment capacity and effect by the effects of biofilm growing on the surface of a filler, rich root systems, filler interception of surface soil and the like.
The traditional artificial wetland type and technology have the following defects:
(1) the traditional wetland has small load and short retention time, most of the traditional wetland is about 3 to 5 days, and the occupied area is large;
(2) the traditional wetland has low treatment efficiency, the oxygen source in the wetland can achieve corresponding treatment effect mainly through photosynthesis of plants and conveying of root systems or through water level difference drop flow oxygen enrichment in spring and summer in the period of vigorous plant growth in two seasons under the premise of ensuring enough residence time; when the temperature is lower in autumn and winter, due to withering of plants and reduction of microbial activity, dissolved oxygen is often not enough to meet the oxidation of organic matters and the nitration reaction of ammonia nitrogen, and meanwhile, under an anaerobic environment, the wetland also does not have enough carbon source to realize the denitrification reaction of nitrogen, so that the treatment efficiency of the wetland is remarkably reduced, pollutants cannot be effectively purified, the quality of effluent cannot stably reach the standard, and the treatment effect of the wetland on tail water of a sewage plant cannot easily reach the IV-class standard of the earth surface;
(3) the treatment efficiency of the conventional wetland is reduced in autumn and winter due to withering and decay of plants, and the decay of the plants may cause the re-release of pollutants.
SUMMERY OF THE UTILITY MODEL
The utility model provides an artificial wetland treatment system for sewage treatment plant tail water treatment, this artificial wetland treatment system have practiced thrift the area by a wide margin, and the efficiency of handling water simultaneously improves especially autumn and winter treatment effeciency improvement to can realize that the water of handling reaches surface water environmental quality standard IV class standard steadily throughout the year.
The technical scheme of the utility model as follows:
a tail water artificial wetland treatment system of a sewage treatment plant sequentially comprises a shallow water multistage drop canal, an artificial combined unit wetland, an underflow wetland and a biostabilization pond according to the sewage flow direction; wherein,
the shallow water multistage drop canal comprises a canal and a multistage drop dam;
the artificial combined unit wetland comprises an aerobic nitrification region, an anoxic denitrification region and a precipitation region;
the subsurface flow wetland comprises a water inlet channel, a microbial reaction area, wetland plants and a water outlet channel;
the biological stabilization pond is provided with an aquatic plant system and an aquatic animal system;
and,
dwarfing evergreen tape grass and emergent aquatic plants are planted in the shallow water multistage drop canal;
the aerobic nitrification region and the anoxic denitrification region of the artificial combined unit wetland are also provided with a plurality of microorganism growth base units at intervals, and the microorganism growth base units comprise denitrification region anoxic unit modules and nitrification region aerobic unit modules; the artificial combined unit wetland also comprises floating plants and benthonic animals, wherein the floating plants are fully paved and planted on the water surface of the artificial combined unit wetland, and the benthonic animals are placed and cultured at the bottom of the settling zone of the artificial combined unit wetland;
the water flow of the subsurface flow wetland is vertical downward water flow, and the microbial reaction area of the subsurface flow wetland is planting soil, limestone, volcanic rock and gravel with the particle size from top to bottom from small to large;
the aquatic plant system of the biological stabilization pond is divided into emergent aquatic plants and submerged plants, the submerged plants comprise more than one of dwarfing evergreen tape grass, hydrilla verticillata, elodea nutans, goldfish algae and horehound, and the aquatic animal system of the biological stabilization pond comprises scraping benthonic animals and/or filter feeding fishes.
Preferably, the shallow water multistage drop canal is divided into two stages of drop, the drop is realized through a drop gravel dam, and the drop height difference of each stage is 30 cm; the water depth of the water drop channel is below 60cm, dwarfing evergreen tape grass is mainly planted, and emergent aquatic plants are planted on the bank; the shallow water multistage drop canal adopts a soil pond structure.
Preferably, a plurality of nitrification-zone aerobic unit modules are horizontally arranged in the aerobic nitrification zone at intervals, a plurality of denitrification-zone anoxic unit modules are horizontally arranged in the anoxic denitrification zone at intervals, the nitrification-zone aerobic unit modules and the denitrification-zone anoxic unit modules both comprise filler supports, different kinds of denitrification fillers are respectively arranged on the filler supports in the nitrification-zone aerobic unit modules and the denitrification-zone anoxic unit modules, and the aeration device is arranged below the filler supports of the nitrification-zone aerobic unit modules.
Preferably, an aeration device is arranged in the aerobic nitrification region, the aerobic nitrification region is also provided with a gas inlet main pipe, the gas inlet main pipe is connected with the aeration device, and the gas inlet main pipe is connected with a blower for supplying gas; the anoxic denitrification area also comprises a carbon source supplementing device, and the carbon source supplementing device is connected with untreated sewage raw water of a sewage plant through a pipeline and used as a carbon source supplementing source for the anoxic denitrification area.
Preferably, the artificial combined unit wetland also comprises a pool bottom structure, the aerobic nitrification region, the anoxic denitrification region and the sedimentation region are all positioned at the upper side of the pool bottom structure, and the periphery of the pool bottom structure is provided with a peripheral structure; the water depth of the manual combination unit is 2.5 meters.
Preferably, the aerobic nitrification region and the anoxic denitrification region are also internally provided with a transverse partition structure, the lower end of the transverse partition structure is connected with the bottom of the artificial combined unit wetland, the upper end of the transverse partition structure is slightly higher than the normal water level, and the length of the transverse partition structure is 75% of the whole transverse length; the transverse partition structures are divided into a plurality of groups, so that the retention time of the sewage in the nitrification and denitrification region is prolonged; and high molecular polymeric ferric salt or aluminum salt is added into the precipitation zone.
Preferably, the artificial combined unit wetland further comprises floating plants and benthonic animals, the floating plants are fully paved and planted on the surface of the artificial combined unit wetland, the floating plants are mainly grass gathering and lentinus edodes, the benthonic animals are cultivated at the bottom of the settling zone of the artificial combined unit wetland, and the benthonic animals are mainly periwinkle snails and anodonta denticulata.
Preferably, the subsurface flow wetland is a vertical subsurface flow wetland and comprises a water inlet channel, a microorganism reaction zone, a water outlet channel, a water inlet water distribution pipeline and a water outlet water collecting pipeline, wherein the water inlet water distribution pipeline and the water outlet water collecting pipeline are both made of PVC materials; the microbial reaction zone comprises 5 layers from top to bottom, which are sequentially as follows: planting soil layers, geotechnical cloth layers, limestone layers, volcanic packing layers and gravel layers; the planting soil layer is arranged as a wetland plant planting substrate, and one or more wetland plants are planted on the planting soil layer; the geotextile layer adopts 120g/m2Geotextile; the water inlet and distribution pipeline penetrates through the wall of the subsurface flow wetland pool through the water inlet channel and is embedded at the top of the volcanic rock packing layer, water is distributed in a pipeline punching and water supplementing mode, and the water inlet and distribution pipeline penetrates through the wall of the pool; the water outlet and collecting pipeline is positioned at the bottom of the gravel layer and is provided with a plurality of holes, and water is collected through the perforated water outlet and collecting pipeline and enters the water collecting channel through the wall of the wetland pool; the water inlet channel and the water outlet channel are respectively arranged on two sides of the wetland; the bottom of the subsurface flow wetland is constructed by adopting a concrete structure, and the wall of the subsurface flow wetland is constructed by adopting a brick structure; wetland plants are planted on the planting soil layer.
Preferably, the gravel layers are sequentially reduced in gravel particle size from bottom to top, the gravel particle size of the bottommost layer is 3 cm-5 cm, the gravel particle size of the uppermost layer is 1 cm-1.5 cm, and the height of the gravel layer is 40 cm; the volcanic rock stratum has the grain size of 5mm and the height of 50 cm; the particle size of the limestone layer is 3-5 mm, and the height is 40 cm.
Preferably, the biostabilization pond includes an aquatic plant system and an aquatic animal system; the aquatic plant system takes submerged plants as main parts and emergent plants as auxiliary parts, the submerged plants account for more than 80 percent, dwarf evergreen tape grass as main parts, the planting area accounts for 50 percent of the area of the whole biological stabilization pond, and other submerged plants are selected from more than one of hydrilla verticillata, waterweed, hornworts and horehound cleft weed and planted in the central position of the biological stabilization pond in an interplanting way; the aquatic animal system comprises benthonic animals and fishes, wherein the benthonic animals mainly breed treponema pallidum, anodonta denticulata and freshwater shrimps, and the fishes are mainly bred by filter feeding fishes, namely chub , and are supplemented by a small amount of carnivorous fishes and omnivorous fishes; the depth of the biostabilization pond is 1.5 meters.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the utility model discloses a sewage plant tail water constructed wetland processing system has been developed, in this system, sewage passes through shallow layer multistage drop canal in proper order, the artificial combination unit wetland, the undercurrent wetland, the biostability pond, preliminarily deposit the oxygenation through shallow layer multistage drop canal, get into the artificial combination unit wetland, realize sewage nitrification denitrification, and the three-dimensional purification of floating plant benthonic animal removes total nitrogen and ammonia nitrogen in the sewage, throw high molecular polymerization molysite or aluminium salt in artificial combination unit wetland settling zone, reach the dephosphorization effect, this unit area is little, can realize sewage plant tail water total nitrogen, ammonia nitrogen and total phosphorus and realize the high efficiency and handle, in order to reduce the load of follow-up constructed wetland, very big saving area; the sewage is treated by the artificial combined unit wetland and then enters the subsurface flow wetland, the BOD, total nitrogen, ammonia nitrogen and total phosphorus in the sewage are further reduced through the comprehensive actions of filtering materials such as volcanic rocks and limestone and the filtering, precipitating, absorbing and attaching microorganisms to plant roots, finally the sewage enters the biostabilization pond, the final purification of the sewage is realized through the purification of an artificially constructed aquatic ecosystem in biostability, and the effluent reaches the IV-class standard of surface water environment quality standard.
The artificial combined unit wetland of the artificial wetland treatment system of the utility model takes the tail water of the sewage plant as a supplementary carbon source and takes ceramsite and volcanic rock as fillers, has small occupied area and has strong effect of removing total nitrogen and ammonia nitrogen from the first-level A effluent of the sewage plant; meanwhile, the front shallow multi-stage drop canal can not only play a role in preliminary sedimentation, but also reduce the oxygenation energy consumption of the post-nitrification reaction through drop-flow type oxygenation; the subsurface wetland at the rear part can play a role in intercepting, adsorbing and filtering phosphorus which is not removed by precipitation in a precipitation zone by adding high-molecular polymeric ferric salt or aluminum salt, the limestone filler in the subsurface wetland has high-efficiency phosphorus purification capability, the other volcanic rock filler in the subsurface wetland can further remove total nitrogen, and the final retention time of the biostabilization pond can be longer. To sum up, the utility model discloses an aquatic ecosystem that artifical the structure can realize the final purification of sewage.
The utility model has the advantages of reduce constructed wetland area, improve constructed wetland treatment efficiency, prevent that constructed wetland from blockking up, especially changed the poor shortcoming of traditional constructed wetland autumn and winter treatment effect when reducing area, realized the comprehensive purification of pollutants in the sewage, made sewage factory tail water process the utility model discloses can stably reach surface water environmental quality standard IV class standard at any time in a year and throughout the year after the processing.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
Fig. 1 is a schematic top view of an embodiment of the present invention;
3 FIG. 32 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 in 3 FIG. 31 3; 3
FIG. 3 is a schematic sectional view taken along line B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a schematic cross-sectional view taken along line D-D of FIG. 1;
in FIG. 1, I is an aerobic nitrification zone, II is an anoxic denitrification zone, and III is a precipitation zone;
reference numbers in fig. 1-4: 1-shallow multi-stage drop canal, 2-artificial combined unit wetland, 3-subsurface wetland, 4-biostabilization pond, 5-wetland water inlet pipe, 6-emergent aquatic plant, 7-dwarfing evergreen tape grass, 8-drop gravel dam, 9-nitrification area aerobic unit module, 10-transverse partition, 11-floating plant, 12-aeration device, 13-air supply main pipe, 14-benthos, 15-denitrification area anoxic unit module, 16-wetland plant, 17-planting soil layer, 18-geotechnical cloth layer, 19-subsurface flow distribution wet water pipeline, 20-volcanic rock packing layer, 21-limestone packing layer, 22-gravel packing layer, 23-subsurface flow wetland water collecting pipeline, 24-subsurface flow wetland water inlet canal, 25-subsurface flow wetland pool, 26-subsurface flow wetland water collecting channel, 27-emergent aquatic plant, 28-biostability pond water inlet pipeline, 29-submerged plant, 30-benthos, 31-fish, 32-wetland water outlet pipe and 33-carbon source supplementing device.
Detailed Description
The present invention will be described in detail below with reference to specific examples.
Examples
The following will describe the system for treating artificial wetland in tail water from sewage treatment plant according to the present invention in detail with reference to fig. 1 to 4, which is an optional embodiment of the present invention, and it is considered that those skilled in the art can modify and color the system without changing the spirit and content of the present invention.
Referring to fig. 1 to 2, the present embodiment provides a tail water artificial wetland treatment system for a sewage treatment plant, which at least includes a shallow multistage drop canal 1, an artificial combined unit wetland 2, an underflow wetland 3, and a biostabilization pond 4, wherein tail water of the sewage treatment plant sequentially passes through the shallow multistage drop canal 1, the artificial combined unit wetland 2, the underflow wetland 3, and the biostabilization pond 4. And, the utility model discloses only prescribe a limit to the order that sewage flowed through, as for the entity space arrangement order of multistage drop canal 1 of shallow layer, artifical combination unit wetland 2, undercurrent wetland 3, biostabilization pond 4, need not arrange according to this order, as long as satisfy sewage and flow through in this order can.
Referring to fig. 1 to 2, one of the design objectives of the shallow multistage drop canal 1 is to remove most of suspended pollutants and soluble pollutants in the influent sewage, the shallow multistage drop canal 1 includes emergent aquatic plants 6, dwarfed evergreen eel grass 7 and gravel drop dams 8, the water depth is controlled within 0.6m to ensure reoxygenation and light penetration to the bottom of the water in the whole water depth range, and the dissolved oxygen concentration in the whole water depth range is maintained above 1.5mg/l by oxygen input through water surface diffusion, oxygen generated by photosynthesis of dwarfed evergreen eel grass and stream-dropping aeration. And under the condition of sufficient oxygen content, the microorganisms on the dwarfed evergreen tape grass 7 can effectively intercept, absorb and degrade most organic pollutants in the sewage. Meanwhile, the shallow multistage drop canal 1 improves dissolved oxygen in sewage and can reduce oxygen demand of subsequent nitration reaction.
Referring to fig. 1 to 3, the artificial combined unit wetland 2 is sequentially divided into an aerobic nitrification region i, an anoxic denitrification region II and a sedimentation region iii along the water flow direction; a plurality of nitrification-region aerobic unit modules 9 are further arranged at intervals in the aerobic nitrification region I along the horizontal direction, and a plurality of denitrification-region anoxic unit modules 15 are further arranged at intervals in the anoxic denitrification region II along the horizontal direction; and, good oxygen nitration district I has still included aeration equipment 12, the utility model discloses a plurality of the position of aeration mouth of aeration equipment 12 is arranged and is realized good oxygen nitration oxygen suppliment of district I, and then distinguishes good oxygen nitration district I, oxygen deficiency denitrification district II. The nitrification region aerobic type unit module 9 and the denitrification region anoxic type unit module 15 both comprise filler supports, different denitrification fillers such as ceramsite, volcanic rock and the like are respectively arranged on the filler supports in the nitrification region aerobic type unit module 9 and the denitrification region anoxic type unit module 15, and the aeration device 12 is arranged below the filler supports of the nitrification region aerobic type unit module 9.
Specifically, referring to fig. 1 to 3, the aeration device 12 of the aerobic nitrification zone i is connected with a blower for supplying air through an air supply main pipe 13.
Specifically, referring to fig. 1 to 3, the anoxic denitrification region II further includes a carbon source supplementing device 33, and the carbon source supplementing device 33 is connected to raw sewage water of a sewage plant through a pipeline to serve as a carbon source for supplementing the anoxic denitrification region II.
Referring to fig. 1, 2 and 5, the aerobic nitrification region i and the anoxic denitrification region II further include a transverse partition structure 10, the lower end of the transverse partition structure 10 is connected with the bottom of the ecological pool, the upper end of the transverse partition structure is slightly higher than the normal water level, and the length of the transverse partition structure 10 from one end of the constructed combined unit wetland in the transverse direction to the opposite bank is set to be 2.5 meters; the number of the transverse partition structures 10 is three along the water flow direction, so that the retention time of sewage in the aerobic nitrification area I and the anoxic denitrification area II is prolonged. Of course, the number of the lateral partition structures 10 may be other numbers, which are determined by those skilled in the art according to practical situations, and is not limited to be understood here.
Referring to fig. 1, a polymeric ferric salt or an aluminum salt is added into the precipitation zone iii.
Referring to fig. 2, the artificial combined unit wetland 2 further includes floating plants 11 and benthonic animals 14 in the vertical direction, the floating plants 11 are fully planted on the water surface of the artificial combined unit wetland 2 and mainly plant the grass-gathering and the mushroom grass, and the benthonic animals 14 are placed at the bottom of the settling zone iii of the artificial combined unit wetland 2 and mainly place the treponema pallidum and the anodonta.
The artificial combined unit wetland 2 further comprises a pool bottom structure, the pool bottom structure is of a concrete structure, the nitrification region, the denitrification region and the sedimentation region are all positioned on the upper side of the pool bottom structure, a peripheral structure is arranged outside the pool bottom structure, the peripheral structure adopts a slope, and the slope is greater than 1: 2; the peripheral structure adopts a clay tamping structure; the effective water depth of the artificial combined unit wetland is 2.5 meters, and the effective water depth is 0.3 meter.
The utility model discloses a design of artifical combination unit wetland 2 realizes the nitrification/denitrification, the short-cut nitrification denitrification of sewage factory tail water, gets rid of total nitrogen and nitrate nitrogen in the sewage. The embodiment researches the effect of the ceramsite and the volcanic rock as the filler of the nitrification and denitrification tank for treating the low-concentration wastewater, and the measurement of the physicochemical properties of the ceramsite and the volcanic rock, a film formation experiment, electron microscope observation and operation tests show that the two fillers have the excellent properties of large specific surface area, rough surface, high porosity, easy attachment of a biological film, quick film formation, large amount of fixed microorganisms, difficult loss and the like, and can obviously improve the nitrification and denitrification efficiency when being used as a microorganism carrier of the nitrification and denitrification tank. Meanwhile, raw sewage water which is not treated in a sewage plant is adopted as a carbon source supplement for realizing denitrification reaction, and the operation cost is reduced.
The vertical analysis shows that the floating plants on the upper part of the artificial combined unit wetland 2 can absorb the nitrogen, phosphorus and other nutrients in the sewage, and the benthonic animals on the bottom can reduce the sludge. The precipitation zone at the rear end of the artificial combined unit wetland 2 can be selectively added with high molecular polymeric ferric salt or aluminum salt to play a role in removing phosphorus.
The design of the artificial combined unit wetland is different from the key of the traditional artificial wetland, the enhanced treatment of the sewage is realized through the nitrification, denitrification and precipitation areas of the artificial combined unit wetland, the removal rates of ammonia nitrogen, total nitrogen and total phosphorus respectively reach 60 percent, 70 percent and 30 percent, the total retention time is about 3.5 hours, the occupied area is small, the load of the subsequent artificial wetland is greatly reduced, the intensive design of the whole land utilization is realized, and the stable standard of the sewage treatment in autumn and winter is ensured.
Please refer to fig. 1, fig. 2 and fig. 4, thereforeThe subsurface flow wetland 3 is a vertical subsurface flow wetland and comprises a subsurface flow wetland water inlet channel 24, a subsurface flow wetland pool 25, a subsurface flow wetland water outlet channel 26, a subsurface flow wetland water distributing pipeline 19 and a subsurface flow wetland water collecting pipeline 23; the undercurrent wetland pool 25 comprises 5 layers from top to bottom, which are sequentially as follows: a planting soil layer 17, a geotextile layer 18, a limestone layer 20, a volcanic packing layer 21 and a gravel layer 22; the planting soil layer 17 is provided with a planting substrate used as a wetland plant 16, and the planting soil layer 17 is planted with wetland plants such as reed, cattail, canna, droughhaired bevel grass and the like; the geotextile layer 18 is 120g/m2The geotextile is used for isolating the planting soil from the filler, but does not influence the downward extension of the wetland plant root system; the subsurface flow wetland water distribution pipe 19 penetrates through the wall of the subsurface flow wetland through the subsurface flow wetland water inlet channel 24, is embedded at the top of the volcanic rock packing layer 21, and distributes water in a pipeline punching and water supplementing manner; the subsurface flow wetland water collecting pipeline 23 is positioned at the bottom of the gravel layer, and collects water through a perforated pipeline and penetrates through the wall of the subsurface flow wetland pool to enter a subsurface flow wetland water collecting channel; the subsurface flow wetland water inlet channel 24 and the subsurface flow wetland water collecting channel 26 are respectively arranged at two sides of the subsurface flow wetland pool 25; the bottom of the subsurface flow wetland 3 is constructed by adopting a concrete structure, and the pool wall adopts a brick structure.
Wherein, the gravel particle diameters of the gravel layers 22 are sequentially reduced from bottom to top, the gravel particle diameter of the bottommost layer is 3 cm-5 cm, the gravel particle diameter of the topmost layer of the gravel layer is 1 cm-1.5 cm, and the height of the gravel layer 22 is 40 cm; the volcanic packing layer 21 is characterized in that the grain diameter of the packing is 5mm, and the layer height is 40 cm; the limestone layer 20 has a particle size of 3-5 mm and a height of 50 cm; in this embodiment, the underflow wet ground distribution pipeline and the underflow wet ground collecting pipeline are made of PVC.
The subsurface flow wetland 3 can perform the effect of intercepting and filtering phosphorus which is not precipitated by adding high molecular polymeric ferric salt or aluminum salt into the precipitation zone III, the limestone filler in the subsurface flow wetland has very high-efficiency phosphorus purification capability, and the absorption and conversion of the phosphorus can be realized by matching with the absorption of the root system of the wetland plant 16; and another volcanic rock filler inside the volcanic rock can further remove the total nitrogen. The designed retention time of the subsurface flow wetland is 6 hours.
Referring to fig. 1 and 2, the biostabilization pond 4 includes a plant system and an aquatic animal system; the plant system mainly comprises a submerged plant 29 and an emergent plant 28, wherein the submerged plant 29 mainly comprises dwarfed evergreen tape grass, the planting area of the submerged plant accounts for 50% of the area of the whole biostabilization pond, and other submerged plants, namely hydrilla verticillata, elodea nutans, goldfish algae and potamogeton malaianus, are planted in the center of the biostabilization pond in an interplanting mode; the aquatic animal system comprises a benthonic animal 30 and fish 31, wherein the benthonic animal 30 mainly breeds treponema pallidum, anodonta denticulata and freshwater shrimps, and the fish 31 breeds mainly filter-feeding fish chub and is supplemented with a small amount of carnivorous fish and omnivorous fish.
The effective water depth of the biological stabilization pond 4 is 1.5 meters, and the height of the biological stabilization pond is 0.3-0.5 meter; the peripheral structure of the biostabilization pond 4 adopts slope releasing, and the slope is greater than 1: 2; the pool bottom structure and the peripheral structure adopt a clay tamping structure.
The designed retention time of the biological stabilization pond 4 is more than 1 day, an artificial aquatic ecosystem is formed by the aquatic plants and the aquatic animals, and the final purification of sewage can be realized; the aquatic plants in the plant cultivation box are rich in varieties, emergent aquatic plants, submerged plants and floating-leaf plants are considered, and the evergreen variety accounts for a large proportion; the aquatic animals have strong diversity, and include scraping and filter feeding benthonic animals, filter feeding fishes, carnivorous fishes, and omnivorous fishes. The constructed aquatic ecosystem has rich biological diversity, long food chain and stable system.
To sum up, the utility model has the advantages of it is following:
1) the design of the shallow multi-stage drop canal in the system can not only fully play the purification role of plant roots and microorganisms, but also improve the dissolved oxygen of water and greatly reduce the energy consumption of the post-nitrification reaction;
2) the artificial combined unit wetland in the system strengthens the nitrification/denitrification, and saves the energy consumption required by the large aeration quantity of the traditional denitrification method by utilizing the biological photosynthesis and the drop flow aeration mode; meanwhile, raw sewage water which is not treated in a sewage plant is used as a carbon source for supplement, so that the treatment cost is reduced; the artificial combined unit wetland saves the treatment cost, can realize long-acting stable treatment on ammonia nitrogen, total nitrogen and total phosphorus in an artificial strengthening mode, reduces the occupied area of the wetland, ensures that the sewage in autumn and winter stably reaches the standard, and is a core treatment unit of the whole wetland system;
3) the subsurface flow wetland in the system optimizes the filler configuration, and improves the nitrogen and phosphorus removal efficiency of the subsurface flow wetland;
4) the biological stabilization pond in the system has longer retention time, longer food chain and stable system, and can ensure that the sewage can be stably discharged after reaching the standard for a long time;
5) the artificial wetland treatment system of the utility model preferably selects a plurality of evergreen submerged plants, thereby improving the treatment efficiency in autumn and winter;
6) the utility model discloses an artificial wetland processing system has intensification the wetland and has used ground, has reduced wetland area of land by a wide margin, and whole wetland system dwell time is about 36.5 hours simultaneously, still very big reduction wetland area of land when guaranteeing that the stable up to standard of quality of water, can reduce area more than 50% than traditional artificial wetland processing technology.
In addition, the utility model realizes the landscaping of sewage treatment and beautifies the environment through optimized plant configuration; the utility model discloses an artificial wetland processing system shock resistance load, it is stable up to standard to go out water, has good application prospect.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A tail water artificial wetland treatment system of a sewage treatment plant is characterized by sequentially comprising a shallow water multistage drop canal, an artificial combined unit wetland, an underflow wetland and a biostabilization pond according to the sewage flow direction; wherein,
the shallow water multistage drop canal comprises a canal and a multistage drop dam;
the artificial combined unit wetland comprises an aerobic nitrification region, an anoxic denitrification region and a precipitation region;
the subsurface flow wetland comprises a water inlet channel, a microbial reaction area, wetland plants and a water outlet channel;
the biological stabilization pond is provided with an aquatic plant system and an aquatic animal system;
and,
dwarfing evergreen tape grass and emergent aquatic plants are planted in the shallow water multistage drop canal;
the aerobic nitrification region and the anoxic denitrification region of the artificial combined unit wetland are also provided with a plurality of microorganism growth base units at intervals, and the microorganism growth base units comprise denitrification region anoxic unit modules and nitrification region aerobic unit modules; the artificial combined unit wetland also comprises floating plants and benthonic animals, wherein the floating plants are fully paved and planted on the water surface of the artificial combined unit wetland, and the benthonic animals are placed and cultured at the bottom of the settling zone of the artificial combined unit wetland;
the water flow of the subsurface flow wetland is vertical downward water flow, and the microbial reaction area of the subsurface flow wetland is planting soil, limestone, volcanic rock and gravel with the particle size from top to bottom from small to large;
the aquatic plant system of the biological stabilization pond is divided into emergent aquatic plants and submerged plants, the submerged plants comprise more than one of dwarfing evergreen tape grass, hydrilla verticillata, elodea nutans, goldfish algae and horehound, and the aquatic animal system of the biological stabilization pond comprises scraping benthonic animals and/or filter feeding fishes.
2. The system for treating the artificial wetland in the tail water of the sewage treatment plant according to claim 1, wherein the shallow multistage drop canal is divided into two-stage drop, drop is realized through a drop gravel dam, and the drop height difference of each stage is 30 cm; the water depth of the water drop channel is below 60cm, dwarfing evergreen tape grass is mainly planted, and emergent aquatic plants are planted on the bank; the shallow water multistage drop canal adopts a soil pond structure.
3. The system for treating the artificial wetland in the tail water of the sewage treatment plant according to claim 1, wherein a plurality of nitrification-zone aerobic-type unit modules are further arranged at intervals in the aerobic nitrification zone along the horizontal direction, a plurality of denitrification-zone anoxic-type unit modules are further arranged at intervals in the anoxic denitrification zone along the horizontal direction, the nitrification-zone aerobic-type unit modules and the denitrification-zone anoxic-type unit modules both further comprise filler supports, the filler supports in the nitrification-zone aerobic-type unit modules and the denitrification-zone anoxic-type unit modules are respectively provided with different types of denitrification fillers, and an aeration device is installed below the filler supports of the nitrification-zone aerobic-type unit modules.
4. The system for treating the artificial wetland in the tail water of the sewage treatment plant according to claim 1, wherein an aeration device is arranged in the aerobic nitrification zone, the aerobic nitrification zone is also provided with a main air inlet pipe, the main air inlet pipe is connected with the aeration device, and the main air inlet pipe is connected with a blower for air supply; the anoxic denitrification area also comprises a carbon source supplementing device, and the carbon source supplementing device is connected with untreated sewage raw water of a sewage plant through a pipeline and used as a carbon source supplementing source for the anoxic denitrification area.
5. The wastewater treatment plant tail water constructed wetland treatment system of claim 1, wherein the constructed combined unit wetland further comprises a tank bottom structure, the aerobic nitrification region, the anoxic denitrification region and the sedimentation region are all positioned on the upper side of the tank bottom structure, and a peripheral structure is arranged on the periphery of the tank bottom structure; the water depth of the manual combination unit is 2.5 meters.
6. The sewage treatment plant tail water constructed wetland treatment system of claim 1, wherein a transverse partition structure is further arranged in the aerobic nitrification region and the anoxic denitrification region, the lower end of the transverse partition structure is connected with the bottom of the artificial combined unit wetland, the upper end of the transverse partition structure is slightly higher than the normal water level, and the length of the transverse partition structure is 75% of the whole transverse length; the transverse partition structures are divided into a plurality of groups, so that the retention time of the sewage in the nitrification and denitrification region is prolonged; and high molecular polymeric ferric salt or aluminum salt is added into the precipitation zone.
7. The system of claim 1, wherein the constructed combined unit wetland comprises floating plants and benthonic animals, the floating plants are planted on the surface of the constructed combined unit wetland in a full way, the floating plants are mainly poly-grass and lentinus edodes, the benthonic animals are cultivated at the bottom of the settling zone of the constructed combined unit wetland, and the benthonic animals are mainly periwinkle and anodonta woodiana.
8. The system for treating the artificial wetland in the tail water of the sewage treatment plant according to claim 1, wherein the subsurface wetland is a vertical subsurface wetland and comprises a water inlet channel, a microorganism reaction zone, a water outlet channel, a water inlet distribution pipeline and a water outlet collecting pipeline, and the water inlet distribution pipeline and the water outlet collecting pipeline are both made of PVC material; the microbial reaction zone comprises 5 layers from top to bottom, which are sequentially as follows: planting soil layers, geotechnical cloth layers, limestone layers, volcanic packing layers and gravel layers; the planting soil layer is arranged as a wetland plant planting substrate, and one or more wetland plants are planted on the planting soil layer; the geotextile layer adopts 120g/m2Geotextile; the water inlet and distribution pipeline penetrates through the wall of the subsurface flow wetland pool through the water inlet channel and is embedded at the top of the volcanic rock packing layer, water is distributed in a pipeline punching and water supplementing mode, and the water inlet and distribution pipeline penetrates through the wall of the pool; the water outlet and collecting pipeline is positioned at the bottom of the gravel layer and is provided with a plurality of holes, and water is collected through the perforated water outlet and collecting pipeline and enters the water collecting channel through the wall of the wetland pool; the water inlet channel and the water outlet channel are respectively arranged on two sides of the wetland; the bottom of the subsurface flow wetland is constructed by adopting a concrete structure, and the wall of the subsurface flow wetland is constructed by adopting a brick structure; wetland plants are planted on the planting soil layer.
9. The system of claim 8, wherein the gravel layers are sequentially decreased in diameter from bottom to top, the diameter of the gravel at the bottommost layer is 3cm to 5cm, the diameter of the gravel at the uppermost layer is 1cm to 1.5cm, and the height of the gravel layer is 40 cm; the volcanic rock stratum has the grain size of 5mm and the height of 50 cm; the particle size of the limestone layer is 3 mm-5 mm, and the height of the limestone layer is 40 cm.
10. The wastewater treatment plant tailwater constructed wetland treatment system of claim 8, wherein the biostabilization pond comprises an aquatic plant system and an aquatic animal system; the aquatic plant system takes submerged plants as main parts and emergent plants as auxiliary parts, the submerged plants account for more than 80 percent, dwarf evergreen tape grass as main parts, the planting area accounts for 50 percent of the area of the whole biological stabilization pond, and other submerged plants are selected from more than one of hydrilla verticillata, waterweed, hornworts and horehound cleft weed and planted in the central position of the biological stabilization pond in an interplanting way; the aquatic animal system comprises benthonic animals and fishes, wherein the benthonic animals mainly breed treponema pallidum, anodonta denticulata and freshwater shrimps, and the fishes are mainly bred by filter feeding fishes, namely chub , and are supplemented by a small amount of carnivorous fishes and omnivorous fishes; the depth of the biostabilization pond is 1.5 meters.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109626575A (en) * | 2019-01-30 | 2019-04-16 | 中国海洋大学 | A kind of low-consumption high-speed service area saprobia-artificial swamp composite handling arrangement |
| CN111410321A (en) * | 2019-01-08 | 2020-07-14 | 兰州理工大学 | A modular loess-based modified filler landscape pond water purification system |
| CN113620540A (en) * | 2021-09-06 | 2021-11-09 | 深圳市万科物业服务有限公司 | Sewage treatment plant tail water treatment circulation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410321A (en) * | 2019-01-08 | 2020-07-14 | 兰州理工大学 | A modular loess-based modified filler landscape pond water purification system |
| CN109626575A (en) * | 2019-01-30 | 2019-04-16 | 中国海洋大学 | A kind of low-consumption high-speed service area saprobia-artificial swamp composite handling arrangement |
| CN113620540A (en) * | 2021-09-06 | 2021-11-09 | 深圳市万科物业服务有限公司 | Sewage treatment plant tail water treatment circulation system |
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