CN114772694B - Hydraulic vortex and micro vortex flocculation combined siphon surface filtration wastewater treatment system - Google Patents
Hydraulic vortex and micro vortex flocculation combined siphon surface filtration wastewater treatment system Download PDFInfo
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- CN114772694B CN114772694B CN202210321466.6A CN202210321466A CN114772694B CN 114772694 B CN114772694 B CN 114772694B CN 202210321466 A CN202210321466 A CN 202210321466A CN 114772694 B CN114772694 B CN 114772694B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A hydraulic vortex and micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system comprises a micro vortex reinforced flocculation area, a suspension clarification separation area and a siphon surface filtration area, wherein wastewater sequentially passes through; the micro vortex reinforced flocculation area mainly makes a large amount of micro vortices which promote particles to collide and flocculate in a mode that tangential nozzle incident water flow whirls to pass through a turbulent grid; the suspension clarification separation zone further adsorbs and intercepts micro flocs through contact flocculation; when the water outlet requirement is high or the water outlet of the suspension clarification separation area does not meet the discharge standard, the raw water wrapped with the micro-floccules can further move to the siphon surface filtering area to perform guaranteed filtering on the wastewater treatment. The siphon water outlet is realized by utilizing the self height of the equipment, so that the double-province requirement of energy conservation and land conservation is realized; the treatment requirements of large water quantity and high standard are fundamentally realized.
Description
Technical Field
The invention relates to the field of tunnel wastewater treatment, in particular to a hydraulic vortex and micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system.
Background
With the development of economy and the increase of daily traffic demands, tunnel construction has dramatically increased. Tunnel engineering is mostly located in mountainous and hilly areas, and some are even located in drinking water source areas or water source conservation areas. During the construction process, a large amount of construction wastewater is generated along with the occurrence of tunnel water burst, a large amount of rock dust is usually accompanied in the wastewater, suspended particles with larger particle size can be precipitated in a three-stage precipitation tank at the tunnel entrance, and the residual particles with the particle size of about 1-100 μm are removed by means of coagulating sedimentation. If the tunnel wastewater is directly discharged without treatment, irreversible damage can be caused to vegetation and water bodies near the tunnel.
Due to the limitation of geological conditions and construction methods, the quality of tunnel wastewater is different. The problems of complex process, long construction period, incapability of recycling, land waste and the like of the traditional tunnel construction period wastewater treatment are difficult to solve. Most tunnel wastewater treatment processes are single, the most common method is to introduce wastewater into a sedimentation tank, and the wastewater is directly discharged after suspended matters settle, so that the treatment effect cannot be guaranteed at all. Because the abdomen land of the tunnel excavation area is usually not large, the available area is greatly limited, and the setting of a large sedimentation tank is difficult, so that the sedimentation time is seriously insufficient, only about 50% -70% of solid suspended matters in the wastewater can be removed, the sedimentation effect is poor, and a plurality of environmental problems such as standard emission cannot be realized. Therefore, how to realize efficient treatment of tunnel wastewater and save occupied space becomes a key of the treatment technology.
Disclosure of Invention
The invention provides a hydraulic vortex micro-vortex flocculation combined siphon surface filtration integrated wastewater treatment system, which aims to solve the problems of high load, small site and high precision treatment of tunnel wastewater equipment.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the system mainly comprises a micro-vortex reinforced flocculation area, a suspension clarification separation area and a siphon type surface filtration area, wherein the waste water sequentially passes through; the micro vortex reinforced flocculation area mainly makes a large amount of micro vortices which promote particles to collide and flocculate in a mode that tangential nozzle incident water flow whirls to pass through a turbulent grid; the suspension clarification separation zone further adsorbs and intercepts micro flocs through contact flocculation; when the water outlet requirement is high or the water outlet of the suspension clarification separation area does not meet the discharge standard, the raw water wrapped with the tiny floccules can further move to the siphon type surface filtering area, and the characteristics of high filter cloth filtering packing density and high filtering precision are utilized to realize the guaranteed filtering of wastewater treatment; meanwhile, the higher height of the clarification device is used as the filter cloth filtration driving pressure, namely the pressure required by surface filtration is provided by utilizing the siphon effect, so that unpowered water outlet is realized.
The micro-vortex reinforced flocculation zone mainly comprises a micro-vortex reaction barrel, wherein the bottom of the micro-vortex reaction barrel is a micro-vortex sludge bucket with a closed cone structure, a plurality of tangential water inlets are arranged on the micro-vortex reaction barrel above the micro-vortex sludge bucket, and the tangential water inlets are arranged at the position of 100-150mm above the micro-vortex sludge bucket; turbulence grid bars are arranged in the micro-vortex reaction barrel at the position 100-120mm above the tangential water inlet through grid bar fixing plates; an inverted conical diversion cover is concentrically arranged at the upper part of the vortex reaction barrel; the tangential water inlets are communicated with a sewage and wastewater water supply pipe, and a wastewater lifting pump is arranged on the sewage and wastewater water supply pipe; one end of the micro-vortex sludge discharge pipe is communicated with the micro-vortex sludge hopper, and the other end of the micro-vortex sludge discharge pipe is provided with a micro-vortex sludge discharge pipe valve.
The turbulence grid bars are in cross arrangement, star arrangement or m-shaped arrangement; the space between the turbulence grid bars is 10-15mm when the cross-shaped arrangement is performed; the space between the turbulence grid bars is 8-10mm when the star-shaped arrangement is carried out, and the space between the turbulence grid bars is 6-8mm when the meter-shaped arrangement is carried out.
The height of the turbulence grid bars from the inside to the periphery is sequentially increased in a step shape, and the height is increased according to the increasing range of 1:1.2-1.5.
The turbulence grid bars are square or diamond structures, and sharp corners of the turbulence grid bars face the direction of water flow coming from the head.
The inlet flow velocity in the tangential water inlet is 1.5-3.5m/s.
The main structure of the suspension clarification separation zone is a suspension clarification column, and the micro-vortex reaction barrel is arranged in the main structure and is coaxially arranged; the cavity between the upper end of the suspension clarification column and the upper end of the micro-vortex reaction barrel is a clean water safety area; a clear water area water outlet pipe is arranged in the clear water safety area, and is controlled by a clear water area water outlet pipe valve and is provided with a suspended clarification area water outlet turbidity meter; the lower part of the suspension clarification column is a closed suspension clarification area sludge hopper which is communicated with a suspension clarification area sludge discharge pipe, and a suspension clarification area sludge discharge pipe valve is arranged on the suspension clarification area sludge discharge pipe.
The main structure of the siphoning type surface filtering area is a groove type filter cloth filter, and the lower part of the siphoning type surface filtering area and the suspension clarification column are connected into a whole in a penetrating way; a siphon type central water outlet pipe is arranged in the groove type filter cloth filter tank through a water outlet pipe supporting rod, and a filter cloth filter tank water outlet pipe valve and a filter cloth filter tank water outlet turbidity meter are sequentially arranged at the outlet of the siphon type central water outlet pipe; and a plurality of filter discs are arranged on the siphon type central water outlet pipe and are connected in a penetrating way.
The back flushing pump of the filter cloth filter tank is communicated with the suction type filter cloth cleaning clamping pieces through the filter cloth flushing water supply pipe, and the suction type filter cloth cleaning clamping pieces are arranged on two sides of the filter disc.
The invention has the following beneficial effects:
the invention adopts the combination process of micro-vortex reinforced flocculation, suspension clarification and surface filtration to treat the wastewater with high efficiency and high precision. The micro vortex strengthening process is mainly completed by adopting turbulent flow grid bars, namely the whole reactor is powered by a water pump, high-speed water flow is pumped by the water pump to enter the reactor in a cyclone mode, and the vortex grid bars are continuously collided by the rotating water flow so as to realize the purpose of manufacturing a large amount of vortex. The particles in the wastewater continuously increase the collision times under the shearing action and centrifugal inertia action of a large number of vortexes so as to realize the purpose of strengthening flocculation, and meanwhile, the grid bars are utilized to accelerate the process of thickening the particles to form flocs, so that the overall hydraulic load of the micro-vortex strengthening flocculation section is improved. The structure of 'floc pool turning' is adopted to make the flocs formed by the micro vortex flocculation section enter a suspension clarification process area, and the interception of tiny particles in the wastewater is further realized by utilizing the contact flocculation of active sludge. Meanwhile, the grid strips continuously crush and reflocculate the formed flocs, so that the characteristics of high density and good sedimentation performance are maintained, the rising flow rate of wastewater in a suspension clarification area is improved, and the high-load treatment of equipment is ensured. The particles escaping from the suspension clarification process zone are further filtered and intercepted by surface filtration technology. And the filter cake formed by depositing particles on the surface of the filter cloth is utilized to adsorb and bond particles in the wastewater, so that the water outlet precision is improved, and the pollution of the filter cloth is relieved. And siphon water outlet is formed on the surface of the filter cloth by utilizing the height difference of the equipment, so that the total energy consumption of the equipment is reduced. The method comprises the following steps:
(1) Micro vortex flocculation and contact flocculation combined significant lifting of treatment load
The micro vortex generating grid bars are arranged at the water inlet end of the equipment so as to generate a large number of micro-scale vortices, so that the mixing effect and the particle collision probability of the equipment are improved, the flocculation efficiency is greatly improved, the dosage of the medicament is reduced, and the size and compactness of the floccules are increased; the contact flocculation and filtration mechanism of the suspended sludge layer is utilized to obviously enhance the treatment load of equipment and create conditions for higher-precision filter cloth filtration.
(2) Combining advanced surface filtration technology to ensure that the quality of the effluent reaches the standard
The surface filter component with high packing density is arranged in the clean water area of the hydraulic clarification section, and on one hand, the clarification unit and the filter unit are organically combined to reduce corresponding equipment components. Meanwhile, the high-density filter cloth filtering technology is utilized to further improve the processing load and the processing precision of equipment, so that the requirements of high water yield and high standard processing are fundamentally met.
(3) Double-high and double-saving process equipment
The three processes of mixing, flocculating and filtering are highly integrated to form integrated equipment, the equipment is developed to space, the occupied area is small, and the occupied area is greatly saved; the invention utilizes the inflow velocity to provide energy for coagulation, replaces motor stirring equipment and simplifies the equipment structure. The equipment has no moving device, does not need mechanical maintenance, and realizes high-efficiency and reliable operation; the equipment utilizes the active sludge to contact and flocculate, so that the dosage of a coagulating agent can be saved; the device utilizes the height difference to carry out siphon water outlet filtration, thereby saving the filtration energy consumption.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective cutaway view of the present invention;
FIG. 2 is a perspective view showing the appearance of the present invention;
reference numerals in the drawings:
11-tangential water inlets, 12 grid fixing plates, 13 turbulence grid bars, 14 micro-vortex reaction barrels, 15-micro-vortex sludge hoppers, 16-micro-vortex sludge pipes, 17-diversion covers, 18-diversion cover supporting rods, 19-micro-vortex reaction barrel fixing rods and FN 1-micro-vortex sludge pipe valves;
21-suspension clarification column, 23-suspension clarification area sludge hopper, 24 suspension clarification area sludge discharge pipe (blow-down pipe), FN 2-suspension clarification area sludge discharge pipe valve, FW 1-clear water area water outlet pipe valve;
31-groove type filter cloth filter, 32-filter disc, 33-siphon type central water outlet pipe, 34-filter cloth washing water supply pipe, 35-suction type filter cloth washing clamping piece, 36-water outlet pipe supporting rod, FW 2-filter cloth filter water outlet pipe valve and FX 1-filter cloth washing valve;
p1-waste water lift pump, P2-filter cloth filter back flushing pump, G1-sewage water supply pipe, J1-suspension clarification area effluent turbidimeter, J2-filter cloth filter effluent turbidimeter.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the invention.
The invention provides a hydraulic vortex micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system for treating tunnel wastewater with high turbidity (high SS content). As shown in fig. 1 and 2. The system mainly comprises a micro vortex reinforced flocculation zone, a suspension clarification separation zone and a siphon type surface filtration zone.
Vortex grid bars for generating vortex are arranged in the micro vortex reinforced flocculation area, turbulence with different degrees is generated in a flow field by utilizing a mode that fluid vortex passes through the vortex grid bars, and then a large amount of micro vortex (vortex with the dimension of 1-500 mu m) for promoting particle collision flocculation is generated.
The suspension clarification separation zone mainly utilizes suspension sludge to adsorb and intercept micro floccules in the wastewater, and further treatment of suspended matters in the wastewater is realized in a contact flocculation mode;
the siphon type surface filtering area mainly relies on high-precision filter cloth to realize the filtration interception of tiny particles which cannot be intercepted by the process, so that the quality of effluent is guaranteed, and the equipment height difference is further utilized to form siphon pressure difference on the surface of the filter cloth, so that unpowered filtration of effluent is realized.
When the water outlet requirement is high or the water outlet of the suspension clarification separation area does not meet the discharge standard, the raw water wrapped with the tiny floccules can further move to the siphon type surface filtering area, and the characteristics of high filter cloth filtering packing density and high filtering precision are utilized to realize the guaranteed filtering of wastewater treatment; meanwhile, siphoning is formed on the surface of the filter cloth by utilizing the height difference of the equipment, and pressure required by surface filtration is provided by utilizing siphoning action, so that unpowered water outlet is realized.
The micro-vortex reinforced flocculation zone mainly comprises a micro-vortex reaction barrel 14, wherein the bottom of the micro-vortex reaction barrel 14 is a micro-vortex sludge bucket 15 with a closed cone structure, and a plurality of tangential water inlets 11 are arranged on the micro-vortex reaction barrel 14 above the micro-vortex sludge bucket 15. The tangential water inlet is arranged at the position of 100-150mm above the sludge hopper in the micro-vortex area so as to reduce disturbance of the rotating water flow to the deposited sludge in the sludge hopper 15.
If water flow at the water inlet directly impacts the turbulence grid bars, the energy of the water flow is rapidly dissipated, rotational flow cannot be formed in the reactor, and micro-vortex cannot be formed at the side wall of the grid bars in a rotational flow passing mode; meanwhile, the high-speed water flow directly impacts the turbulence grid bars for a long time, so that ineffective loss of the turbulence grid bars can be caused. Therefore, the grid fixing plate 12 and the turbulence grid 13 are arranged at the position 100-120mm above the water inlet, the turbulence grid 13 is fixed on the grid fixing plate 12 in a socket joint or welding mode, and the grid fixing plate 12 is arranged in the vortex reaction barrel 14.
An inverted conical diversion cover 17 is concentrically arranged at the upper part of the vortex reaction barrel 14; the wastewater treated by the micro-vortex reinforced flocculation area can radially move to the diversion cover, and under the drainage of the inverted diversion cover, water flow forms a primary turning pool, so that most particles are turned out of the micro-vortex reinforced flocculation area under the action of water flow wrapping and clamping, and flocculation and sedimentation are carried out in the suspension clarification area. Meanwhile, the water flow is forced to decelerate at the position by the arrangement of the diversion cover, so that the impact and disturbance to the suspended sludge layer are reduced, and the equipment has impact load with certain capacity.
The tangential water inlets 11 are communicated with a sewage and wastewater water supply pipe G1, and a wastewater lifting pump P1 is arranged on the sewage and wastewater water supply pipe G1; one end of the micro-vortex sludge discharge pipe 16 is communicated with the micro-vortex sludge hopper 15, and the other end is provided with a micro-vortex sludge discharge pipe valve FN1.
The number of the tangential water inlets 11 may be determined according to the diameter of the reaction tub, at least two tangential water inlets may be disposed when the diameter of the reaction tub is within 600mm, and not less than 4 water inlets should be disposed when the diameter of the reaction tub is 600mm to 1200 mm.
The turbulence grid bars 13 are in cross arrangement, star arrangement or m-shaped arrangement; the number and the interval of the turbulence grid bars can be changed according to the water treatment amount of the raw water, when the water treatment amount is 5-12m 3 In the process of/d, the turbulence grid bars can be arranged in a cross shape, and the space between the turbulence grid bars can be controlled between 10mm and 15mm; when the water treatment amount is 12-24m 3 In the process of/d, the turbulence grid bars can be arranged in a star shape, and the space between the turbulence grid bars can be controlled between 8mm and 10 mm; when the treated water amount is 24m 3 And when the distance is higher than/d, the turbulence grid bars can be arranged according to a shape like a Chinese character 'mi', and the distance between the turbulence grid bars can be controlled between 6mm and 8mm.
The turbulence grid bars 13 are in cross arrangement, star arrangement or m-shaped arrangement; the number and the interval of the turbulence grid bars can be changed according to the water treatment amount of the raw water, when the water treatment amount is 1-5m 3 In the process of/h, the turbulence grid bars can be arranged in a cross shape, and the space between the turbulence grid bars can be controlled between 8mm and 10 mm; when the water treatment amount is 6-9m 3 In the process of/h, the turbulence grid bars can be arranged in a star shape, and the space between the turbulence grid bars can be controlled between 6mm and 8 mm; when the treated water amount is 10m 3 And when the speed is higher than or equal to the speed/h, the turbulence grid bars can be arranged according to the shape of a Chinese character 'mi', and the space between the turbulence grid bars can be controlled between 4 mm and 6 mm.
The height of the turbulence grid 13 is increased from the inside to the periphery in sequence to be in a ladder shape, and the height is increased according to the increasing range of 1:1.2-1.5, and the maximum height of the grid is not more than 2/3 of the total height of the reaction column.
The grid too high can cause the formed flocs to be broken when colliding with the grid, so that the quality of the effluent is deteriorated, and meanwhile, according to the numerical simulation result, the main flow direction of the water flow is vertical upwards after the dissipation effect of the grid on the water flow exceeds 2/3 of the reactor, and no obvious rotational flow effect exists, so that the grid is not required to continue to flow.
Because the vortex grid bars are arranged in a stepped manner, the number of grid bars which are collided by formed floccules in the process of rotating upwards is reduced, the breakage of the floccules is avoided, and meanwhile, the broken and reflocculated micro-floccules of partial loose floccules in the collision process, so that the compactness of the micro-floccules is increased.
The turbulence bars 13 are square or diamond-shaped, and the sharp corners of the turbulence bars face the direction of the water flow coming from the head, which is called the windward side, and the direction of the water flow coming from the head, which is called the leeward side. When the diamond-shaped turbulence bars 13 are used, the angle should be controlled between 6-45 °.
The inlet flow rate in the tangential water inlet 11 is 1.5-3.5m/s, which ensures sufficient reaction energy in the vortex flocculation process.
The main structure of the suspension clarification separation zone is a suspension clarification column 21, and the micro-vortex reaction barrel 14 is arranged in the main structure and is coaxially arranged; the cavity between the upper end of the suspension clarification column 21 and the upper end of the micro-vortex reaction barrel 14 is a clean water safety zone, so that the suspension sludge layer is prevented from being disturbed strongly by the siphoning of the cloth filter. The clear water safety zone is internally provided with a clear water zone water outlet pipe 22 which is controlled by a clear water zone water outlet pipe valve FW1 and is provided with a suspension clarification zone water outlet turbidity meter J1, the suspension clarification zone water outlet turbidity meter J1 monitors the water quality of the water in real time, and when the content of the water outlet suspended matters exceeds 20mg/L or the required discharge standard cannot be met, the valve FW1 is required to be closed to further treat the wastewater through a filter cloth filter; the lower part of the suspension clarification column 21 is provided with a closed suspension clarification area sludge hopper 23, the suspension clarification area sludge hopper 23 is communicated with a suspension clarification area sludge discharge pipe 24, and a suspension clarification area sludge discharge pipe valve FN2 is arranged on the suspension clarification area sludge discharge pipe 24.
The main structure of the siphoning type surface filtering area is a groove type filter cloth filter tank 31, and the lower part of the siphoning type surface filtering area is communicated with a suspension clarification column 21 into a whole; a siphon type central water outlet pipe 33 is arranged in the groove type filter cloth filter 31 through a water outlet pipe supporting rod 36, and a filter cloth filter water outlet pipe valve FW2 and a filter cloth filter water outlet turbidity meter J2 are sequentially arranged at the outlet of the siphon type central water outlet pipe 33; the siphon type central water outlet pipe 33 is provided with a plurality of filter-chip boxes 32 which are connected in a penetrating way.
The cloth filter back flushing pump P2 is communicated with the suction type cloth cleaning clamping pieces 35 through the cloth flushing water supply pipe 34, the suction type cloth cleaning clamping pieces 35 are arranged on two sides of the filter cartridge 32, and when the filter is cleaned, the clamping pieces clamp the filter discs for cleaning.
The working principle of the invention is as follows:
the vortex reinforced flocculation area is an inner cylinder structure with turbulence grid bars, and water flow can strongly act with the turbulence grid bars after entering the vortex reinforced flocculation area in a cyclone mode. When the water flow passes through the turbulence grid bars, the main flow is decelerated by resistance on the windward side of the turbulence grid bars, large-scale vortex in the main flow can be cut by edges of the windward side to generate vortex breaking, when the fluid micro-mass moves further to the leeward side of the turbulence grid bars, the flow channel form becomes gradually expanded, and the fluid generates boundary layer stripping under the action of viscosity and reverse pressure difference. Thereby generating a large number of microscale vortices suitable for impact flocculation of the fine particles, i.e. Kolmogorov vortices.
Particles carried in the wastewater collide with each other under the action of the micro vortex, meanwhile, the vortex is easy to generate centrifugal force along the radial direction due to small vortex size, and the micro particles radially migrate under the action of the centrifugal force, so that the particles on the inner side of the vortex collide with the particles on the outer side of the vortex, and the collision times are increased. At the same time, the micro vortex can shear the formed floccules, so that the bound water among the floccules is forced to be continuously compressed, and thus a relatively compact floccule is formed.
Meanwhile, the water flow can fall down in the axial direction due to gravity in the cyclone upward process, so that back mixing in the radial direction occurs, the back mixing is favorable for further diffusion of the medicament, and meanwhile, particles are promoted to continuously collide in the radial direction.
The floccule formed by the process has the characteristics of high density and good sedimentation performance, thereby providing favorable conditions for the load lifting of equipment.
The water flow gradually loses the rotational flow capacity in the process of rotation and rising, the water flow starts to move upwards to the conical guide cover under the action of pressure along the radial direction of the reactor, the water flow enters the suspension clarification column in a 'pool turning' mode under the action of the guide cover, large particles are deposited under the action of gravity, and small particles continue to rise along with the water flow. The section of the suspension clarification column is larger than the area of the micro-vortex flocculation area, so that the rising flow speed of water flow is reduced from 6-10mm/s of the micro-vortex flocculation area to 1-2.5mm/s, and the flocs are gradually accumulated in the area above the diversion cover to form a suspension sludge layer with adsorption effect.
When the water flow wrapped with the tiny floccules passes through the surface of the suspended sludge, the concentration of electrolyte in the water is insufficient to repel the two particles, and the tiny floccules can gradually adsorb on the surface of the active sludge of the suspended sludge layer to contact and flocculate so as to form larger floccules. Along with the continuous interception of the sludge in the suspension clarification area to the micro-flocculation particles, a clear mud-water separation interface is gradually formed in the reactor, and the turbidity of the supernatant fluid of the reactor effluent is gradually reduced to a stable value.
Particles escaping after treatment in the suspension clarification area move to a siphoning type surface filtration guarantee area along with water flow, siphoning is caused by utilizing the advantage of the self height difference of equipment, and filter cloth or filter membrane for surface filtration has enough transmembrane pressure difference so as to realize filtration treatment.
The floc particles deposit on the surface of the filter tank to form a filter cake layer with certain permeability, and tiny particles escaping from the suspension clarification area are firstly intercepted by the filter cake in the filtering process, so that the pollution of filter cloth is slowed down. Meanwhile, compared with deep-bed filtration, the surface filtration has larger filling density, and the processing capacity of the filtration link is greatly improved.
The working process of the invention comprises the following steps:
taking raw water with turbidity of 1000-1500NTU as an example:
after raw water enters the reactor from the tangential water inlet 11, water flows upwards in a vortex reaction barrel in a vortex manner to form a diamond vortex grid 13, when the water flows pass through the windward side of the grid, the water flow section is reduced, the speed is locally increased to form first energy dissipation, large-scale vortex wrapped with tiny particles is broken for the first time and dissipated into smaller-scale vortex, when the water flows further move to the leeward side of the grid, the flow channel is suddenly expanded to further generate boundary layer stripping along the surface of the grid, the process further dissipates main flow energy, the vortex scale is further reduced, the energy of the water flows is continuously dissipated by the vortex grid in the process of advancing in a vortex manner, the large-scale energy-carrying vortex is also continuously dissipated into micro-vortex similar to the scale of particles in the water, and the particles collide in the same direction and radial direction under the action of the micro-vortex, so that sink occurs.
Further, the chemical entering the reactor along with the raw water is further and fully dispersed under the severe turbulence of the turbulence bars.
Further, as the particles in the water gradually aggregate and grow, the tiny particles gradually form tiny floccules which are more compact and have a certain size.
When the water flow moves to a certain height, the main flow direction is changed from the initial rotational flow to the upward flow in the radial direction. The water flow is forced to enter the suspended clarification column in a 'pool turning' mode under the action of the conical diversion cover, larger floc particles in the water are deposited under the action of gravity, and tiny floc particles continuously rise along with the water flow.
Further, as the water flow rises slowly in the suspension clarification area, the micro-flocculation particles are in a suspension state under the action of gravity and water flow to form a suspension sludge layer. With the collision and accumulation of the micro-flocculation particles, a suspended sludge layer with a large number of active adsorption sites is gradually formed, meanwhile, the sludge-water separation interface is gradually clear, and the turbidity of the supernatant fluid is gradually reduced. Further, the suspended sludge layer is continuously turned over and circulated under the action of water flow and gravity, and then is subjected to contact flocculation similar to adsorption with the micro-flocculation particles entering subsequently, so that the micro-flocculation particles and the micro-particles are captured.
Further, a clear water safety area with the distance of 0.5-0.7m is reserved between the suspended sludge layer and the filter cloth 31, a clear water outlet pipe 22 of the clear water safety area is arranged at the part of the clear water safety area, and when the turbidity of the supernatant is lower than 10NTU or the content of suspended matters is lower than 20mg/L, a valve FW1 can be opened for discharging. If the discharge requirement is not met, the valve FW1 is closed to enable water flow to further move upwards into the filter cloth filter, when the water flow reaches a set liquid level, the valve FW2 is opened, and siphon water outlet is carried out by utilizing the siphon pressure formed on the surface of the filter cloth by the height difference of the equipment.
Claims (9)
1. The system is characterized by mainly comprising a micro-vortex reinforced flocculation area, a suspension clarification separation area and a siphon type surface filtration area, wherein the waste water passes through the micro-vortex reinforced flocculation area, the suspension clarification separation area and the siphon type surface filtration area in sequence; the micro vortex reinforced flocculation area mainly makes a large amount of micro vortices which promote particles to collide and flocculate in a mode that tangential nozzle incident water flow whirls to pass through a turbulent grid; the suspension clarification separation zone further adsorbs and intercepts micro flocs through contact flocculation; when the water outlet requirement is high or the water outlet of the suspension clarification separation area does not meet the discharge standard, the raw water wrapped with the tiny floccules can further move to the siphon type surface filtering area, and the characteristics of high filter cloth filtering packing density and high filtering precision are utilized to realize the guaranteed filtering of wastewater treatment; meanwhile, the higher height of the clarification device is used as the filter cloth filtration driving pressure, namely the pressure required by surface filtration is provided by utilizing the siphon effect, so that unpowered water outlet is realized.
2. The hydraulic vortex and micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system according to claim 1, wherein the micro vortex reinforced flocculation zone mainly comprises a micro vortex reaction barrel (14), the bottom of the micro vortex reaction barrel (14) is a micro vortex sludge bucket (15) with a closed cone structure, a plurality of tangential water inlets (11) are arranged on the micro vortex reaction barrel (14) above the micro vortex sludge bucket (15), and the tangential water inlets are arranged at the upper edge of the micro vortex sludge bucket by 100-150 mm; turbulent flow grid bars (13) are arranged in the micro vortex reaction barrel (14) at the position 100-120mm above the tangential water inlet (11) through grid bar fixing plates (12); an inverted conical diversion cover (17) is concentrically arranged at the upper part of the micro-vortex reaction barrel (14); the tangential water inlets (11) are communicated with a sewage and wastewater supply pipe (G1), and a wastewater lifting pump (P1) is arranged on the sewage and wastewater supply pipe (G1); one end of the micro-vortex sludge discharge pipe (16) is communicated with the micro-vortex sludge hopper (15), and the other end of the micro-vortex sludge discharge pipe is provided with a micro-vortex sludge discharge pipe valve (FN 1).
3. The hydraulic vortex and micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system according to claim 2, wherein the turbulence grid bars (13) are in a cross-shaped arrangement, a star-shaped arrangement or a rice-shaped arrangement; the space between the turbulence grid bars (13) is 10-15mm when in cross arrangement; the space between the turbulence grid bars (13) is 8-10mm when the star-shaped arrangement is carried out, and the space between the turbulence grid bars (13) is 6-8mm when the m-shaped arrangement is carried out.
4. A hydraulic vortex micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system according to claim 3, wherein the height of the turbulence grid bars (13) is increased from the inside to the periphery in a step shape in sequence, and the height is increased according to the increasing range of 1:1.2-1.5.
5. The integrated wastewater treatment system for combining hydraulic vortex and micro vortex flocculation and siphon surface filtration according to claim 4, wherein the turbulence grid (13) has a square or diamond structure, and the sharp angle of the turbulence grid faces the water flow in the direction coming from the head.
6. A hydraulic vortex microturbine flocculation combined siphon surface filtration integrated wastewater treatment system according to claim 2, characterised in that the inlet flow rate in the tangential water inlet (11) is 1.5-3.5m/s.
7. The hydraulic vortex and micro vortex flocculation combined siphon surface filtration integrated wastewater treatment system according to claim 1, wherein the main structure of the suspension clarification separation zone is a suspension clarification column (21), and the micro vortex reaction barrel (14) is arranged in the suspension clarification column and is coaxially arranged in the suspension clarification column; the cavity between the upper end of the suspension clarification column (21) and the upper end of the micro-vortex reaction barrel (14) is a clean water safety area; a clear water area water outlet pipe (22) is arranged in the clear water safety area, is controlled by a clear water area water outlet pipe valve (FW 1) and is provided with a suspended clarification area water outlet turbidity meter (J1); the lower part of the suspension clarification column (21) is provided with a closed suspension clarification area sludge hopper (23), the suspension clarification area sludge hopper (23) is communicated with a suspension clarification area sludge discharge pipe (24), and a suspension clarification area sludge discharge pipe valve (FN 2) is arranged on the suspension clarification area sludge discharge pipe (24).
8. The integrated wastewater treatment system for combining hydraulic vortex and micro vortex flocculation and siphon surface filtration according to claim 1, wherein the main structure of the siphon surface filtration area is a groove type filter cloth filter (31), and the lower part of the siphon surface filtration area and a suspension clarification column (21) are connected into a whole in a penetrating way; a siphon type central water outlet pipe (33) is arranged in the groove type filter cloth (31) through a water outlet pipe supporting rod (36), and a filter cloth filter water outlet pipe valve (FW 2) and a filter cloth filter water outlet turbidity meter (J2) are sequentially arranged at the outlet of the siphon type central water outlet pipe (33); and a plurality of filter discs (32) are arranged on the siphon type central water outlet pipe (33) and are connected in a penetrating way.
9. The hydraulic vortex and microturbation combined siphon surface filtration integrated wastewater treatment system according to claim 1, wherein a filter cloth filter tank backwash pump (P2) is communicated with a suction type filter cloth cleaning clamping piece (35) through a filter cloth flushing water supply pipe (34), and the suction type filter cloth cleaning clamping piece (35) is arranged on two sides of a filter sheet (32).
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| CN202210321466.6A CN114772694B (en) | 2022-03-30 | 2022-03-30 | Hydraulic vortex and micro vortex flocculation combined siphon surface filtration wastewater treatment system |
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| CN114772694B true CN114772694B (en) | 2023-07-25 |
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