CN110510826B - Black odorous water enhanced treatment system and process - Google Patents

Black odorous water enhanced treatment system and process Download PDF

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Publication number
CN110510826B
CN110510826B CN201910861389.1A CN201910861389A CN110510826B CN 110510826 B CN110510826 B CN 110510826B CN 201910861389 A CN201910861389 A CN 201910861389A CN 110510826 B CN110510826 B CN 110510826B
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water
channel
black
ecological
treatment
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CN110510826A (en
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陈光辉
张碧波
邢汉君
黄罕添
赵青
罗灿
盛丹
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Hunan Hengkai Environment Technology Investment Co ltd
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Hunan Hengkai Environment Technology Investment Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/105Phosphorus compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/38Organic compounds containing nitrogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/301Aerobic and anaerobic treatment in the same reactor
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/32Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used

Abstract

The invention discloses a black and odorous water strengthening treatment process system of a grit chamber, a rapid filtering channel and an ecological strengthening area, and belongs to the field of black and odorous water body treatment of sewage treatment engineering. The black and odorous water strengthening treatment process consists of a diversion gate, a sand settling channel, an overflow weir, a rapid filtering channel, a water guide pipe, a flow making aerator and an aquatic animal and plant ecosystem area. The process system can be used for treating black and odorous water riverways with higher treatment target requirements, inlet water is subjected to sand setting pretreatment and then achieves the effects of water body purification and the like, and pollutants such as water body turbidity, COD (chemical oxygen demand), N (nitrogen), P (phosphorus) and the like are removed efficiently.

Description

Black odorous water enhanced treatment system and process
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a black smelly water enhanced treatment system and a black smelly water enhanced treatment process.
Background
In the sewage treatment engineering, the artificial wetland technology is used for treating the water body with higher COD, N and P contents.
The artificial wet land technology is characterized by that in order to treat sewage, the soil and filling material (such as gravel) are artificially mixed on the depression land with a certain length-width ratio and bottom surface gradient to form a filling material bed, so that the sewage can be flowed in the filling material gap of bed body or flowed on the surface of bed body, and on the surface of bed body the aquatic plants (such as reed and cattail, etc.) with good performance, high survival rate, strong water-resisting property, long growth period, beautiful appearance and economic value can be planted so as to form a unique animal and plant ecological system.
The artificial wetland can remove a wide range of pollutants, including N, P, SS, organic matters, trace elements, pathogens and the like. The research results show that the artificial wetland can treat BOD under the condition of low influent water concentration5The removal rate of the wastewater can reach 85-95 percent, the COD removal rate can reach more than 80 percent, the concentration of BOD5 in the treated wastewater is about 10mg/l, and the SS is less than 20 mg/l. (2) Most organic matters in the wastewater are used as organic nutrients of heterogeneous microorganisms,is finally converted into microorganisms and CO2,H2O。
The existing black and odorous water treatment mainly adopts submerged plants, floating plants, emergent plants and an anaerobic anoxic and aerobic process for constructing microbial growth, but the processes can not be used for pretreating black and odorous water bodies and treating the black and odorous water bodies with higher suspended load, and the removal efficiency of organic matters is low.
Disclosure of Invention
Aiming at the defects and shortcomings in the field, the invention provides a system and a process for treating black and odorous water by utilizing an artificial wetland, which integrate a sand setting channel, a rapid filtering channel and an ecological strengthening area.
The technical scheme of the invention is as follows:
a black and odorous water strengthening treatment system is characterized by comprising a sand setting channel, a rapid filtering channel and an ecological strengthening area in sequence according to the water flow direction; the sand setting channel and the rapid filtering channel are higher than the ecological strengthening area; the channel of the sand setting channel is integrally of a curve structure; the curve length of the curve is set according to the following formula, wherein the curve length is water flow and overflow load, and the overflow load is less than or equal to 1.7 mm/s; an overflow weir is arranged on the wall of the channel at the side where the black smelly water flows out; the rapid filtering channel is filled with filler capable of filtering black and odorous water, and the bottom of the filler is also provided with a water collecting and guiding device capable of guiding water flowing through the filler into the ecological strengthening area; plants are planted in the ecological enhancement area.
The channel curve length of the sand setting channel is set according to the formula, so that the outlet water can be ensured to be stable in a laminar flow state, and the purification effect of black and odorous water can be improved integrally.
A water inlet is formed in one side channel wall of the sand setting channel, into which black odorous water flows, and a water inlet retaining wall is arranged on the inner wall of the other side channel wall, corresponding to the water inlet; preferably, the sand setting channel is arranged in a river channel with black odorous water, and the height of the channel wall of the sand setting channel is consistent with the height of a river bank;
preferably, the volume of the sand setting channel is calculated according to the following formula: the volume of the sand setting channel is equal to the hydraulic retention time multiplied by the water flow, wherein the hydraulic retention time is more than 1 hour;
preferably, the width of the sand setting channel is 10-20 m; the water inlet is provided with a diversion gate.
The volume of the sand setting channel can store the sunk suspended matters, and the larger width of the sand setting channel can enable the cleaning machine to enter the mode of cleaning sediments regularly. The hydraulic retention time is greater than 1 hour, the purpose of this setting being: ensuring that sand grains or other impurities have enough settling time and storage space when the water body passes through the sand settling channel; the width of sand setting canal is 10 ~ 20 meters, adopts this width to purify the effect that black smelly water played to be: and the mechanical energy can freely pass in and out for cleaning and maintaining the sand setting channel in the later period.
The water collecting and guiding device comprises a perforated water collecting pipe and a perforated water guiding pipe, wherein the perforated water collecting pipe is embedded at the bottom of the filler of the rapid filtering channel along the axial direction of a channel of the channel, one end of the perforated water collecting pipe is communicated with the perforated water collecting pipe, and the other end of the perforated water guiding pipe extends into the ecological enhancement area;
preferably, the perforated water conduit comprises a water main conduit and a water branch conduit; one end of the water guide main pipe is communicated with the perforated water collecting pipe, and the other end of the water guide main pipe is communicated with the water guide branch pipe; one end of the water guide branch pipe is communicated with the water guide main pipe, and the other end of the water guide branch pipe extends into the ecological enhancement area;
preferably, the number of the water guide main pipes is a plurality, and the water guide main pipes are uniformly distributed on the perforated water collecting pipes; the water guide branch pipe is of a radial branch structure;
preferably, one end of the water guide main pipe communicated with the water guide branch pipe extends into the middle area of the ecological enhancement area; the radial water guide branch pipes are uniformly distributed in the ecological strengthening area, and one end of each partial water guide branch pipe, which is far away from the water guide main pipe, is close to the water inlet end of the whole ecological strengthening area. The arrangement is favorable for uniformly guiding the water in the water collecting pipe into the ecological strengthening area.
The filler is a graded filler structure;
preferably, the graded filler structure comprises an upper layer and a lower layer; the upper layer has a particle diameter phi of 5-8 mm, and the lower layer has a particle diameter phi of 30-50 mm.
The advantages of using such a particle size for the upper layer are: the small gap is formed, the screen mesh function is achieved, the interception and filtration of fine suspended matters are achieved, the lower layer can support the fine suspended matters through the particle size, the gap is large, and the water collection resistance is small.
The overflow weir is of a curved structure;
preferably, the curve structure of the overflow weir is matched with the curve structure of the channel of the sand settling channel in parallel;
preferably, a plurality of overflow grooves are arranged at the top of the overflow weir, a plurality of overflow holes are arranged below the overflow grooves, and the distance between the top of each overflow hole and the bottom of each overflow groove is 0.1 meter;
preferably, the height of the overflow weir is 0.1mm lower than the level of the incoming water channel in which the black and odorous water strengthening treatment system is arranged.
The distance between the top of the overflow hole and the bottom of the overflow groove is 0.1 meter, thus the overflow device has the advantages that: the water outlet of the sand basin is uniform on the whole surface, and is rectified to flow out, when the normal water volume is large, the sand basin overflows through the overflow holes, when the water volume is large, the water outlet exceeds the overflow holes and simultaneously flows out uniformly from the overflow groove on the upper part, and the overflow holes and the overflow groove play a role in uniform water distribution.
In the ecological enhancement area, submerged plants are planted in a 0.5-1 meter depth area, emergent plants are planted in a 0.1-0.5 meter depth area, and a landscape ecological floating island, a bionic aquatic plant and a floating fountain aerator are arranged on the water surface corresponding to a 1-1.5 meter depth area.
Different environments in various depth regions can remove different pollutants, for example, dissolved oxygen in a 0-0.5 m region is high, mainly removing organic matters and ammonia nitrogen, an anoxic environment exists in a 0-1.5 region, mainly removing total nitrogen through denitrification, and an anaerobic environment exists in a region larger than 1.5 m, so that the removal of total phosphorus pollutants is facilitated;
the ecological enhancement area in the black and odorous water strengthening treatment system is equivalent to an improved surface flow constructed wetland improved type, different plant populations with different water depths are constructed on the basis of the existing surface flow constructed wetland, and fountain type aeration is added to construct various thallus environments;
the submerged plants are planted to treat black smelly water: the submerged plants have strong absorption and purification effects on nitrogen and phosphorus in the bottom sediment; the effect of planting emergent aquatic plants on treating black and odorous water is as follows: the method has a good purification effect on ammonia nitrogen in the water body and simultaneously has a good landscape effect; the landscape ecological floating island is arranged in a depth area of 1-1.5 meters, and because a certain water depth can ensure that plant roots grow and suspend in a water body, a biofilm environment is formed at the same time, and ecological balance is constructed by feeding animals and fishes in water; the bionic aquatic weeds are arranged below the water surface and used for constructing a biomembrane environment and constructing an anaerobic and anoxic environment to absorb and treat organic matters and ammonia nitrogen; the floating fountain aerator is used for constructing an aerobic environment and treating organic matters and ammonia nitrogen.
The black odorous water strengthening treatment process is characterized in that the black odorous water strengthening treatment system is adopted to treat black odorous water.
Arranging the black and odorous water strengthening treatment system in a riverway to be treated; the wall of the sand setting channel of the black odorous water strengthening treatment system is not parallel to the water flow direction of the river channel;
preferably, the water flow direction entering the black and odorous water strengthening treatment system is vertical to the river channel.
As shown in fig. 2, the water flow entering direction of the black and odorous water strengthening treatment system of the present invention is perpendicular to the river channel, and the arrangement direction of the system is parallel to the river channel.
The ecological strengthening area of the black and odorous water strengthening treatment system is arranged in a section with larger river channel width mutation, or can be arranged at the upstream of an ecological park;
preferably, the ecological park can be used as an ecological enhancement area of the black odorous water enhancement treatment system.
The processing system of the invention: the components of the sand settling channel, the overflow weir and the rapid filtering channel can be regularly nursed according to the following conditions: 1. when silt accumulation appears in the sand setting channel, the overflow weir can run sand, and the silt can be used as a building material when the dredger is required to be adopted for cleaning the silt. 2. If the moss appears seriously, the overflow weir needs to be cleaned. 3. If the sand setting channel is blocked due to overlong operation time, high-pressure water is needed to wash the filtering layer. 4. In order to avoid blockage of the sand setting channel, the perforated aeration pipe can be installed on the sand setting channel, and a high-pressure fan is adopted to carry out air backwashing while water is fed, so that blockage is avoided.
The invention provides an artificial wetland process system consisting of a sand setting channel, a rapid filtering channel and an ecological strengthening area, which is characterized in that the sand setting channel is added in front of the ecological strengthening area, the whole body is of a curve structure, and the concrete details are shown in a schematic diagram of the sand setting channel system in figure 2. The sand setting channel consists of a water inlet, a water inlet retaining wall, an arc-shaped sand setting channel and a rectification overflow weir. The functions of each part are as follows: water inlet: guiding water to enter; and (3) water inflow retaining wall: energy dissipation is carried out on the incoming water, and the water flow speed is reduced; arc sand setting channel: the suspended substances and the silt in the inlet water are precipitated to form a silt precipitation place; a rectification overflow weir: the water outlet flow speed is controlled, the water outlet uniformity is controlled, the water flow disturbance is reduced, and the sedimentation is accelerated. The innovation points of the invention are as follows: firstly, a curve-shaped overflow weir is provided, the length of an effluent weir is increased in a limited space, and the water flow speed and the effluent load are reduced; secondly, the width of the sand setting channel is large, a forklift and the like can directly enter the sand setting pool, and later cleaning and maintenance are facilitated. The overflow weir is also a curved structure matched with the sand settling channel and consists of a lower overflow hole and an upper overflow groove. The lower overflow hole has the functions of: under the condition of normal small water amount, water flows out of the water distribution holes after sand setting, and the low-water-amount water distribution effect is achieved; when the water quantity is increased and the lower water distribution hole can not meet the water outlet requirement, the excessive water quantity overflows from the upper overflow groove to distribute water, and the effect of distributing water with large water quantity is achieved. See weir schematic for details. The overflow weir of the present invention takes into account the different water requirements based on conventional overflow. The schematic structure is shown in fig. 3. The rapid filtering channel is of a structure with uniform water inlet and distribution graded fillers and consists of graded fillers, a perforated water collecting pipe and a perforated water guide branch pipe; the components respectively play the following roles: the grading filler has the following functions: intercepting suspended matters of different specifications; the function of the perforated water collecting pipe is as follows: the filtered water was collected. See the fast filter channel diagram for details. The perforation aqueduct consists of a main aqueduct and perforation aqueduct branch pipes, and the perforation aqueduct has the functions of: the water which is primarily filtered is uniformly guided into the ecological strengthening, and the water has the function of uniform water distribution. The quick filtering channel is structurally innovated as follows: the main water collecting pipe is directly embedded into the packing layer, which is favorable for quickly collecting water. Secondly, the perforated pipes radially penetrate into the whole ecological strengthening area, which is beneficial to uniform water distribution. The structure of the rapid filtering ditch is schematically shown in figure 4.
The sand setting channel is characterized in that the sand setting channel is arranged in the length direction of a river channel and is vertical to the water flow direction, the flow cross section area is increased, the flow velocity of the river is effectively reduced, and suspended matters in a water body can be settled and removed in a short time.
The sand setting channel has a certain volume, can ensure the hydraulic retention time of more than 1 hour, has different volumes due to different water flows, can store the sunk suspended matters, has the width of 10-20 meters, and can enable a cleaning machine to enter a machine for regularly cleaning sediments.
The water outlet end of the sand setting channel is provided with an overflow weir, and the water outlet end of the sand setting channel is characterized in that inflow water and outflow water of an upstream riverway are rectified to be in a laminar flow state, so that precipitation pretreatment of polluted water is facilitated, and the load of a subsequent treatment process is reduced.
The overflow goes into the rapid filtering channel, large-aperture filler is arranged in the rapid filtering channel, and a large-aperture perforated pipe is arranged at the bottom of the filler and is used as a water collecting and guiding pipe.
The perforated water collecting pipe under the rapid filtering channel is provided with a perforated water guide branch pipe, and the perforated water guide branch pipe is connected to enter the ecological strengthening area and is arranged in the ecological strengthening area according to the hydraulic requirement.
The large-diameter perforated pipe is connected with the small-diameter perforated branch pipe, the large-diameter perforated pipe is a water collecting pipe at the bottom of the filler, the aperture range of the large-diameter perforated pipe is phi 15-20, the small-diameter perforated branch pipe extends into a radial perforated water guide pipe of the ecological enhancement area, the aperture range of the small-diameter perforated branch pipe is phi 5-8, water is quickly filtered and then is uniformly conveyed to the ecological enhancement area, and the short circuit of the water body is avoided.
The water flowing down from the filter layer is convenient to collect and is guided into the rapid filtering water inlet pipe and the perforated water collecting pipe, and the water filter is characterized in that suspended matters are quickly intercepted, the water quantity is uniformly distributed, and the impact on a wetland ecological area caused by overlarge local water quantity is avoided.
The process is an integral process for treating black and odorous water, and the sand setting channel is in a relationship of pretreatment, filtration treatment, water distribution at the back section and ecological enhancement advanced treatment. The invention forms an integral process for treating the black and odorous water body on the basis of combining the respective characteristics to obtain better black and odorous water treatment effect.
The black smelly water treatment process has the following characteristics: 1. a complete pretreatment and enhanced advanced treatment scheme is provided for the open black and odorous water body with large water quantity. 2. Through rapid filtration and multi-stage perforation water distribution, the problem that water with large water volume is evenly distributed to an ecological system is solved, and the problem of large local impact load is solved. 3. The construction of high-efficiency anaerobic, anoxic and aerobic environment in the ecological strengthening area is proposed to ensure the biochemical strengthening treatment of the micro-polluted water body. 4. The submersible reflux pump is adopted, and the large circulation inside the submersible reflux pump is arranged, so that the water body activation is realized, and the energy-saving and environment-friendly requirements are met.
The upstream water enters the grit chamber through the water guide gate, passes through the water distribution overflow weir, is uniformly distributed and then enters the rapid filtering channel at the front end of the wetland ecosystem (see figure 1), and enters the subsequent ecological treatment system through the perforated water distribution pipe after being primarily treated by filtering.
The wetland park ecosystem consists of a flow-making aeration push flow area and an ecological enhancement area. The method is mainly characterized in that intermittent aeration is carried out in a wetland ecosystem to construct an alternate aerobic and anoxic environment, the nitrification and denitrification of microorganisms are utilized to purify sewage, and pollutants such as turbidity, COD, N, P and the like in the water body are removed. Meanwhile, the plant root system and the microorganism form a symbiotic system, so that the nitrogen fixation function of the plant can be exerted, the aim of removing N is fulfilled, and the nitrogen removal effect of an ecological system is enhanced.
Drawings
Fig. 1 is a schematic structural diagram of a black odorous water enhanced treatment system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a sand settling channel system of the black odorous water strengthening treatment system according to an embodiment of the present invention.
Fig. 3 is a schematic view of an overflow weir of a black odorous water enhanced treatment system according to another embodiment of the present invention.
Fig. 4 is a schematic diagram of a rapid filter ditch of a black odorous water enhanced treatment system according to an embodiment of the present invention.
The labels in the figure are listed below: 1-a sand setting channel, 11-a channel wall, 111-a water inlet, 1111-a diversion gate, 112-a water inlet retaining wall, 121-a channel, 13-an overflow weir, 131-an overflow groove and 132-an overflow hole; 2-rapid filtering channels, 21-filler, 22-water collecting and guiding device, 221-perforated water collecting pipe, 222-perforated water guiding pipe, 2221-main water guiding pipe and 2222-branch water guiding pipe; 3-ecological strengthening area, 31-submerged plant growing area, 32-emergent aquatic plant growing area, 33-landscape ecological floating island, 34-bionic aquatic plant and 35-floating fountain aerator
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The term "rapid filter channel", "filter channel" and "rapid filter layer" as used herein refers to a "rapid filter channel". First group of embodiments, black odorous water strengthening treatment system of the invention
The embodiment of the group provides a black smelly water strengthening treatment system. The present group of embodiments has the following common features: as shown in fig. 1 and fig. 2, the black and odorous water enhanced treatment system sequentially comprises a sand setting channel 1, a rapid filtering channel 2 and an ecological enhanced area 3 according to the water flow direction; the sand setting channel 1 and the rapid filtering channel 2 are higher than the ecological strengthening area 3; the channel of the sand setting channel 1 is integrally of a curve structure; the curve length of the curve is set according to the following formula, wherein the curve length is water flow and overflow load, and the overflow load is less than or equal to 1.7 mm/s; an overflow weir 13 is arranged on the channel wall 11 on the black odorous water outflow side; the rapid filtering channel 2 is filled with filler capable of filtering black and odorous water, and the bottom of the filler is also provided with a water collecting and guiding device 22 capable of guiding water flowing through the filler into an ecological strengthening area; plants are planted in the ecological strengthening area 3.
The channel curve length of the sand setting channel is set according to the formula, so that the outlet water can be ensured to be stable in a laminar flow state, and the purification effect of black and odorous water can be improved integrally.
In some embodiments, a water inlet 111 is formed in one side of the channel wall 11 of the sand settling channel 1 into which the black and odorous water flows, and a water inlet retaining wall 112 is formed on the inner wall of the other side of the channel wall 11 at a position corresponding to the water inlet 111; preferably, the sand setting channel 1 is arranged in a river channel with black odorous water, and the height of the channel wall 11 of the sand setting channel 1 is consistent with the height of a river bank;
preferably, the volume of the sand setting channel 1 is calculated according to the following formula: the volume of the sand setting channel is equal to the hydraulic retention time multiplied by the water flow, wherein the hydraulic retention time is more than 1 hour;
preferably, the width of the sand setting channel 1 is 10-20 m; the water inlet 111 is provided with a diversion gate 1111.
The volume of the sand setting channel can store the sunk suspended matters, and the larger width of the sand setting channel can enable the cleaning machine to enter the mode of cleaning sediments regularly. The hydraulic retention time is greater than 1 hour, the purpose of this setting being: ensuring that sand grains or other impurities have enough settling time and storage space when the water body passes through the sand settling channel; the width of sand setting canal is 10 ~ 20 meters, adopts this width to purify the effect that black smelly water played to be: and the mechanical energy can freely pass in and out for cleaning and maintaining the sand setting channel in the later period.
In other embodiments, the water collecting and guiding device 22 includes a perforated water collecting pipe 221 embedded along the axial direction of the channel at the bottom of the filling of the rapid filtration channel 2, and a perforated water guiding pipe 222 with one end connected to the perforated water collecting pipe 221 and the other end extending into the ecological enhancement area 3;
preferably, the perforated water conduit 222 includes a water main conduit 2221 and a water branch conduit 2222; one end of the water guide main pipe 2221 is communicated with the perforated water collection pipe 221, and the other end is communicated with the water guide branch pipe 2222; one end of the water guide branch pipe 2222 is communicated with the water guide main pipe 2221, and the other end thereof extends into the ecological enhancement area 3;
preferably, the number of the water guiding main pipes 2221 is several, and the water guiding main pipes are uniformly distributed on the perforated water collecting pipe 221; the water manifold 2222 has a radial branch structure;
preferably, one end of the water main 2221, which is communicated with the water branch 2222, extends into the middle area of the ecological enhancement area 3; the radial water guiding branch pipes 2222 are uniformly distributed in the ecological strengthening area 3, and one end of a part of the water guiding branch pipes 2222, which is far away from the water guiding main pipe 2221, is close to the water inlet end of the whole ecological strengthening area 3. This arrangement facilitates uniform introduction of water in the water collection pipe 221 into the eco-friendly zone.
In particular embodiments, the filler is a graded filler structure;
preferably, the graded filler structure comprises an upper layer and a lower layer; the upper layer has a particle diameter phi of 5-8 mm, and the lower layer has a particle diameter phi of 30-50 mm.
The advantages of using such a particle size for the upper layer are: the small gap is formed, the screen mesh function is achieved, the interception and filtration of fine suspended matters are achieved, the lower layer can support the fine suspended matters through the particle size, the gap is large, and the water collection resistance is small.
In some embodiments, the weir 13 is a curvilinear structure;
preferably, as shown in fig. 3, the curved structure of the overflow weir 13 is matched with the curved structure of the channel of the sand-settling channel 1 in parallel;
preferably, a plurality of overflow chutes 131 are arranged at the top of the overflow weir 13, a plurality of overflow holes 132 are arranged below the overflow chutes 131, and the distance between the hole tops of the overflow holes 132 and the bottoms of the overflow chutes 131 is 0.1 meter;
preferably, the height of the overflow weir 13 is 0.1mm lower than the level of the incoming water channel in which the black and odorous water strengthening treatment system is installed.
The distance between the top of the overflow hole and the bottom of the overflow groove is 0.1 meter, thus the overflow device has the advantages that: the water outlet of the sand basin is uniform on the whole surface, and is rectified to flow out, when the normal water volume is large, the sand basin overflows through the overflow holes, when the water volume is large, the water outlet exceeds the overflow holes and simultaneously flows out uniformly from the overflow groove on the upper part, and the overflow holes and the overflow groove play a role in uniform water distribution.
In other embodiments, as shown in fig. 4, in the ecological enhancement area 3, a submerged plant planting area 31 for planting submerged plants is in a 0.5-1 m depth area, an emergent plant planting area 32 for planting emergent plants is in a 0.1-0.5 m depth area, and a landscape ecological floating island 33, a bionic aquatic plant 34 and a floating fountain aerator 35 are arranged on the water surface corresponding to the 1-1.5 m depth area.
Different environments in various depth regions can remove different pollutants, for example, dissolved oxygen in a 0-0.5 m region is high, mainly removing organic matters and ammonia nitrogen, an anoxic environment exists in a 0-1.5 region, mainly removing total nitrogen through denitrification, and an anaerobic environment exists in a region larger than 1.5 m, so that the removal of total phosphorus pollutants is facilitated;
the ecological enhancement area in the black and odorous water strengthening treatment system is equivalent to an improved surface flow constructed wetland improved type, different plant populations with different water depths are constructed on the basis of the existing surface flow constructed wetland, and fountain type aeration is added to construct various thallus environments;
the submerged plants are planted to treat black smelly water: the submerged plants have strong absorption and purification effects on nitrogen and phosphorus in the bottom sediment; the effect of planting emergent aquatic plants on treating black and odorous water is as follows: the method has a good purification effect on ammonia nitrogen in the water body and simultaneously has a good landscape effect; the landscape ecological floating island is arranged in a depth area of 1-1.5 meters, and because a certain water depth can ensure that plant roots grow and suspend in a water body, a biofilm environment is formed at the same time, and ecological balance is constructed by feeding animals and fishes in water; the bionic aquatic weeds are arranged below the water surface and used for constructing a biomembrane environment and constructing an anaerobic and anoxic environment to absorb and treat organic matters and ammonia nitrogen; the floating fountain aerator is used for constructing an aerobic environment and treating organic matters and ammonia nitrogen.
Group 2 example, Black odorous Water Reinforcement treatment Process of the invention
The group of embodiments provides a black odorous water strengthening treatment process, which is characterized in that the black odorous water strengthening treatment system according to any one of the group 1 embodiments is adopted to treat black odorous water.
In a specific embodiment, the black and odorous water strengthening treatment system is arranged in a riverway to be treated; the wall of the sand setting channel of the black odorous water strengthening treatment system is not parallel to the water flow direction of the river channel;
preferably, the water flow direction entering the black and odorous water strengthening treatment system is vertical to the river channel.
As shown in fig. 2, the water flow entering direction of the black and odorous water strengthening treatment system of the present invention is perpendicular to the river channel, and the arrangement direction of the system is parallel to the river channel.
In other embodiments, the ecological enhancement area of the black and odorous water enhancement treatment system is arranged in a section with a large mutation of the width of the river channel, or can be arranged at the upstream of an ecological park;
preferably, the ecological park can be used as an ecological enhancement area of the black odorous water enhancement treatment system.
The downstream river ecological buffer zone in the figure 1 refers to a downstream landscape river, and black and odorous water in the upstream river can be used as water for the downstream ecological landscape river after being purified by the system process.
Prior to the present invention, there has been no report of the treatment of black smelly water using a ditch structure or a weir structure. According to the experimental condition, the system and the process for treating black odorous water can greatly reduce the concentration of suspended matters entering the ecological system and reduce the organic load of a subsequent ecological system. Compared with the traditional method in the prior art, the method provided by the invention has the advantages that the water entering the ecological system is pretreated, the accumulation of sediment of the subsequent ecological system and the release of pollutants are greatly reduced, and the black and odorous risks of the subsequent ecological system are reduced.

Claims (20)

1. A black and odorous water strengthening treatment system is characterized by comprising a sand setting channel, a rapid filtering channel and an ecological strengthening area in sequence according to the water flow direction; the sand setting channel and the rapid filtering channel are higher than the ecological strengthening area; the channel of the sand setting channel is integrally of a curve structure; the curve length of the curve is set according to the following formula, wherein the curve length is water flow and overflow load, and the overflow load is less than or equal to 1.7 mm/s; an overflow weir is arranged on the wall of the channel at the side where the black smelly water flows out; the overflow weir is of a curved structure; a water inlet is formed in one side channel wall of the sand setting channel, into which black odorous water flows, and a water inlet retaining wall is arranged on the inner wall of the other side channel wall, corresponding to the water inlet; the rapid filtering channel is filled with filler capable of filtering black and odorous water, and the bottom of the filler is also provided with a water collecting and guiding device capable of guiding water flowing through the filler into the ecological strengthening area; plants are planted in the ecological enhancement area.
2. The black odorous water strengthening treatment system according to claim 1, wherein the sand trap is provided in a river channel having black odorous water, and a height of a channel wall of the sand trap coincides with a height of a river bank.
3. The black odorous water enhanced treatment system according to claim 1 or 2, wherein the debris trap volume is calculated according to the following formula: the volume of the sand setting channel is equal to the hydraulic retention time multiplied by the water flow, wherein the hydraulic retention time is more than 1 hour; the width of the sand setting channel is 10-20 m; the water inlet is provided with a diversion gate.
4. The black odorous water enhanced treatment system according to claim 1, wherein the water collecting and guiding device comprises a perforated water collecting pipe embedded at the bottom of the filler of the rapid filtration channel along the axial direction of the channel, and a perforated water guiding pipe with one end communicated with the perforated water collecting pipe and the other end extending into the ecological enhancement area.
5. The black odorous water strengthening treatment system according to claim 4, wherein the perforated water conduit includes a water conduit main pipe and a water conduit branch pipe; one end of the water guide main pipe is communicated with the perforated water collecting pipe, and the other end of the water guide main pipe is communicated with the water guide branch pipe; one end of the water guide branch pipe is communicated with the water guide main pipe, and the other end of the water guide branch pipe extends into the ecological enhancement area.
6. The black odorous water strengthening treatment system according to claim 5, wherein the water manifold is a plurality of water manifolds which are evenly distributed on the perforated water collecting pipe; the water guide branch pipe is of a radial branch structure.
7. The black odorous water enhanced treatment system according to claim 5 or 6, wherein one end of the water manifold communicating with the water branch pipes extends into the middle area of the ecological enhancement area; the radial water guide branch pipes are uniformly distributed in the ecological strengthening area, and one end of each water guide branch pipe, which is far away from the water guide main pipe, is close to the water inlet end of the whole ecological strengthening area; the arrangement is favorable for uniformly guiding the water in the water collecting pipe into the ecological strengthening area.
8. The black odorous water strengthening treatment system according to claim 1 or 4, wherein the filler is a graded filler structure.
9. The black odorous water strengthening treatment system according to claim 8, wherein the graded filler structure includes an upper layer and a lower layer; the upper layer has a particle diameter phi of 5-8 mm, and the lower layer has a particle diameter phi of 30-50 mm.
10. The black odorous water enhanced treatment system according to claim 1, wherein the curved structure of the overflow weir is fitted in parallel with the curved structure of the channel of the sand trap.
11. The black odorous water strengthening treatment system according to claim 1 or 10, wherein a plurality of overflow chutes are provided at the top of the overflow weir, a plurality of overflow holes are provided below the overflow chutes, and the distance between the top of the overflow holes and the bottom of the overflow chutes is 0.1 m.
12. The black odorous water enhancing treatment system according to claim 1 or 10, wherein the height of the overflow weir is 0.1mm lower than the level of an incoming water channel in which the black odorous water enhancing treatment system is installed.
13. The black odorous water enhanced treatment system according to claim 11, wherein the height of the overflow weir is 0.1mm lower than the level of an incoming water channel in which the black odorous water enhanced treatment system is provided.
14. The black odorous water strengthening treatment system according to any one of claims 1 and 4 to 5, wherein in the ecological strengthening area, submerged plants are planted in a 0.5-1 meter depth area, emergent plants are planted in a 0.1-0.5 meter depth area, and landscape ecological floating islands, bionic aquatic plants and a floating fountain aerator are arranged on the water surface corresponding to a 1-1.5 meter depth area.
15. The black odorous water strengthening treatment system according to claim 7, wherein in the ecological strengthening area, submerged plants are planted in a 0.5-1 meter depth area, emergent plants are planted in a 0.1-0.5 meter depth area, and landscape ecological floating islands, bionic aquatic plants and a floating fountain aerator are arranged on the water surface corresponding to a 1-1.5 meter depth area.
16. The black odorous water strengthening treatment process is characterized in that the black odorous water is treated by the black odorous water strengthening treatment system according to any one of claims 1 to 15.
17. The black odorous water strengthening treatment process according to claim 16, wherein the black odorous water strengthening treatment system is provided in a river to be treated; the sand setting canal wall of the black odorous water strengthening treatment system is not parallel to the water flow direction of the river.
18. The black odorous water strengthening treatment process according to claim 16, wherein the water flow direction entering the black odorous water strengthening treatment system is perpendicular to a river channel.
19. The black odorous water enhanced treatment process according to any one of claims 16 to 18, wherein the ecological enhancement area of the black odorous water enhanced treatment system is provided in a section where the abrupt change in the width of the river is large, or may be provided upstream of an ecological park.
20. The black odorous water enhanced treatment process of claim 19, wherein the ecological park can be used as an ecological enhancement area of the black odorous water enhanced treatment system.
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