CN108751611B - Efficient printing and dyeing wastewater treatment system and treatment method thereof - Google Patents

Abstract

The invention discloses a high-efficiency printing and dyeing wastewater treatment system and a treatment method thereof, which are used for desizing and/or alkali-reduction printing and dyeing wastewater treatment, wherein the treatment system comprises a pretreatment device and a deep treatment device, and the pretreatment device comprises a first regulating tank capable of precipitating PVA and/or terephthalic acid and/or wastewater and an air floatation machine for separating precipitated slurry from wastewater. The scheme is exquisite in design, simple in structure, and the PVA sizing agent and the terephthalic acid in the printing and dyeing wastewater are removed from the wastewater in advance, so that COD in the water is greatly reduced, the defect that the pollutants cannot be effectively degraded in biochemical treatment can be effectively overcome, the COD load of the biochemical treatment can be reduced, the treatment efficiency of the whole system is greatly improved, and the final effluent is ensured to reach the standard.

Description

Efficient printing and dyeing wastewater treatment system and treatment method thereof

Technical Field

The invention relates to the field of sewage treatment, in particular to a high-efficiency printing and dyeing wastewater treatment system and a treatment method thereof.

Background

The printing and dyeing wastewater has the characteristics of large water quantity, high organic pollutant content, large alkalinity, large water quality change and the like, belongs to one of industrial wastewater which is difficult to treat, and along with the development of the printing and dyeing industry, a large number of fiber products appear, and the application of new chemical sizing agents, dyes, finishing agents and the like makes the components of the printing and dyeing wastewater more complex, and further increases the treatment difficulty.

The conventional treatment method mainly adopts biochemical treatment, and the COD and chromaticity of the effluent of the pure biochemical treatment method are difficult to reach the standards, because the refractory organic compounds in the sewage are difficult to degrade by microorganisms, difficult to remove by the conventional biological treatment process, and difficult to degrade by natural self-cleaning after the biochemical treated sewage is discharged into the natural environment.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a high-efficiency printing and dyeing wastewater treatment system and a treatment method thereof.

The aim of the invention is achieved by the following technical scheme:

the high-efficiency printing and dyeing wastewater treatment system is used for desizing and/or alkali-reduction printing and dyeing wastewater treatment and comprises a pretreatment device and an advanced treatment device, wherein the pretreatment device comprises a first regulating tank capable of precipitating PVA and/or terephthalic acid and/or from the desizing and/or alkali-reduction printing and dyeing wastewater and an air flotation machine for separating precipitated slurry from the wastewater.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the advanced treatment device comprises a second regulating tank, a biological selection tank, a biochemical treatment system, a secondary sedimentation tank, a second coagulation tank, a second flocculation tank, a high-efficiency sedimentation tank and a clean water tank which are sequentially connected.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the biochemical treatment system comprises an aeration device and a diving plug flow device, and the rotating speed of the diving plug flow device is between 30 and 50 rpm.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the high-efficiency sedimentation tank comprises a tank body, a water inlet and a water outlet are formed in the tank body, the water inlet is communicated with a water distribution chamber in the tank body, sedimentation areas are respectively formed on two sides of the water distribution chamber, a group of parallel inclined plates are obliquely arranged in each sedimentation area, each inclined plate is a flat plate, the sedimentation areas are communicated with a water outlet, and the water outlet is formed in the bottom of the water outlet.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the tail end of the water distribution chamber extends to the lower part of the inclined plate, and a group of water distribution openings are uniformly distributed on two side plates of the water distribution chamber, which are positioned below the inclined plate.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the width of the sedimentation zone is 1+/-0.2 m.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, each inclined plate is in sealing connection with the inner wall of the tank body and the side plate of the water distribution chamber to keep a micro gap.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, a group of guide plates are formed on the surface of the inclined plate, which is opposite to the bottom of the tank body.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the water outlet area is communicated with each precipitation area through at least one water outlet channel, and the heights of water outlet weir plates on two sides of the water outlet channel are adjustable.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, a dredging device capable of cleaning the sludge on the sloping plate through bubbles is arranged below the sloping plate, the dredging device comprises an air pipe with a group of air holes, and the air pipe is connected with a compressed gas supply device.

Preferably, in the high-efficiency printing and dyeing wastewater treatment system, the bottom of the tank body is a sludge hopper, the inclination angle of the side wall of the sludge hopper is not more than 20 degrees, and the high-efficiency printing and dyeing wastewater treatment system further comprises a sludge scraper capable of stirring sludge in the sludge hopper.

Preferably, the high-efficiency printing and dyeing wastewater treatment system further comprises a sludge treatment device connected with the air floatation machine and the high-efficiency sedimentation tank.

The high-efficiency printing and dyeing wastewater treatment method comprises the following steps:

s1, adding sulfuric acid into desizing and/or alkali reduction printing and dyeing wastewater, adjusting the pH value to 3-4, and adding polyiron into the wastewater for coagulation; introducing the coagulated wastewater into an air floatation machine for solid-liquid separation;

s2, introducing the wastewater subjected to the step S1 into a deep treatment device, performing biochemical treatment, coagulating sedimentation, and discharging the clear water after reaching the standard.

The technical scheme of the invention has the advantages that:

the scheme is exquisite in design, simple in structure, and utilizes the acid precipitation principle to remove PVA slurry and terephthalic acid in printing and dyeing wastewater from wastewater in advance, so that COD in water is greatly reduced, the defects that the biochemical treatment cannot be effectively degraded can be effectively overcome, the COD load of the biochemical treatment is reduced, the treatment efficiency of the whole system is greatly improved, and the final yielding water is ensured to reach the standard.

The shallow air flotation machine is utilized for solid-liquid separation, the treatment efficiency is high, the water outlet effect is good, and the removal efficiency of COD can reach more than 70%.

Through the design to high-efficient sedimentation tank, the swash plate forms certain inclination and places in the sedimentation zone with the horizontal plane, has shortened granule settling distance, thereby shortened settling time, increased the sedimentation area of sedimentation tank, improved the throughput and the treatment effeciency of sedimentation tank, adopt the dull and stereotyped as the swash plate, increased the passage area when suspended solid falls on the swash plate, simultaneously, the dull and stereotyped surface is smooth, the granule thing of subsideing on the dull and stereotyped is easier to slide to the sedimentation tank bottom along the swash plate, the problem that the mud concentrates on a certain region and causes the siltation has been avoided, combine water distribution room water distribution simultaneously can make the water distribution even, let the velocity of flow keep as far as possible between each swash plate, and reduce the impact of rivers to the sedimentation tank bottom and improve granule settling efficiency, the influence to the suspended solid sedimentation effect has been reduced.

The water distribution ports are distributed on the side plates of the water distribution chamber, and the width of each sedimentation area is controlled, so that the uniformity of water distribution in each inclined plate area can be ensured, the flow velocity of water flow in the sedimentation area between each inclined plate is ensured to be consistent, particles can be settled on the inclined plates after moving along a certain route, the particles in wastewater can be stably removed, meanwhile, the flow velocity is stabilized, the disturbance of the precipitated suspended matters can be avoided, the sedimentation effect is improved, and the water quality of discharged water is ensured.

The inclined plate of the high-efficiency sedimentation tank is in sealing connection with the tank wall and the water distribution chamber, so that the problems of water flow short circuit and mud leakage caused by sewage directly flowing to the upper part of the inclined plate from a gap between the inclined plate and the tank wall and the water distribution chamber can be avoided, and the sedimentation effect is guaranteed; and each inclined plate is independently installed and conveniently detached, so that the maintenance and the replacement of the single inclined plate are convenient for the whole assembly, and the cost of parts and the maintenance difficulty are reduced.

The baffle plates are additionally arranged on the inclined plates of the efficient sedimentation tank, so that the uniformity of the water channel is ensured, and the deformation and sludge blockage conditions of the straight inclined plates are avoided.

The high-efficiency sedimentation tank cleans the sloping plate through the dredging device, can timely clean the sludge deposited on the sloping plate, avoids blocking a water flow channel, influences the problem of water outlet effect, and is favorable for prolonging the service cycle.

Compared with the traditional sludge hopper, the high-efficiency sedimentation tank has the advantages that the height of the sludge hopper is larger, the storage capacity of the sludge is small, the water content of the sludge is high, and the like.

Drawings

FIG. 1 is a schematic diagram of a system of the present invention;

FIG. 2 is a top view of the air floatation machine of the present invention;

FIG. 3 is a cross-sectional view of one embodiment of an air flotation machine of the present invention;

FIG. 4 is a schematic view of a header in an air floatation machine of the present invention;

FIG. 5 is a cross-sectional view of another embodiment of the air flotation machine of the present invention;

FIG. 6 is a top view of the high efficiency sedimentation tank of the present invention;

FIG. 7 is a schematic perspective view of the high efficiency sedimentation tank of the present invention (only a partial structure of the outlet channel is shown in the figure);

FIG. 8 is a schematic view of the water distribution chamber of the high efficiency sedimentation tank of the present invention;

FIG. 9 is a schematic diagram of the effluent channel of the high efficiency sedimentation tank of the present invention;

fig. 10 is a structural sectional view of a high efficiency sedimentation tank having a mud scraper therein according to the present invention.

Detailed Description

The objects, advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of the technical scheme of the invention, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the scope of the invention.

In the description of the embodiments, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the scheme, the direction approaching the operator is the near end, and the direction separating from the operator is the far end, with reference to the operator.

The efficient printing and dyeing wastewater treatment system disclosed in the present invention for desizing and/or alkali-abating printing and dyeing wastewater treatment will be described with reference to the accompanying drawings, and as shown in fig. 1, the efficient printing and dyeing wastewater treatment system comprises a pretreatment device 100 and a further treatment device 200, wherein the pretreatment device 100 comprises a first regulating tank 1001 capable of precipitating PVA and/or terephthalic acid from wastewater, and an air flotation machine 1002 for separating precipitated slurry (PVA and/or terephthalic acid) from wastewater.

Wherein the first conditioning tank 1001 precipitates PVA and/or terephthalic acid from wastewater using an acid precipitation principle, which is connected to the air floatation machine 1002 through a pipe mixer (not shown).

The air floatation machine 1002 may be a known air floatation device, preferably a shallow air floatation machine, and the shallow air floatation machine is preferably made of SS316 material, which can effectively adapt to an acidic PH environment to ensure use stability.

In another preferred embodiment, as shown in fig. 2 and fig. 3, the air floatation machine may further have a structure including a first coagulation tank 30, a first flocculation tank 40, a reaction tank 50 and an air floatation tank 60 which are sequentially communicated, where the air floatation tank 60 includes a contact area 601, a separation area 602, a slag discharge tank 603 and a clear water tank 604, a group of dissolved air releasers 606 connected with an air supply device 605 are disposed in the contact area 601, a slag scraper 607 is disposed above the separation area 602, and a movement stroke of a slag scraping plate 6071 of the slag scraper 607 covers the separation area 602, so that full coverage of slag scraping can be achieved, slag scraping effect is effectively improved, deposited sludge at a bottom of the tank is reduced, water quality of effluent is improved, and separation efficiency of scum and liquid is improved.

As shown in fig. 2, the separation area 602 and the clean water tank 604 are communicated through a water collecting pipe 608 with a water inlet hole 6081, and as shown in fig. 4, the water inlet hole 6081 is positioned at the lower half part of the water collecting pipe 608, and the included angle between the axis of the water inlet hole and the horizontal plane is 45 degrees +/-5 degrees, so that the flow rate of the discharged water can be effectively reduced, the disturbance to the water flow at the bottom of the tank is reduced, and the quality of the discharged water is improved.

During operation, sewage firstly enters the first coagulation tank 30, coagulant is added in the first coagulation tank 30, the sewage reacts with the coagulant to form indissolvable tiny particles, then enters the first flocculation tank 40, flocculant is added in the first flocculation tank 40, the tiny particles in the sewage react with the flocculant to further form larger particles, and then enters the reaction tank 50 to react to form stable flocs; the sewage after chemical adding reaction enters a contact area 601 of an air floatation tank 60, is fully mixed and contacted with dissolved air water released by a dissolved air releaser 606, flocs in the sewage fully absorb and adhere tiny bubbles and then enter a separation area 602, the flocs float to the water surface under the action of bubble buoyancy to form a scum layer, scum is scraped into a slag discharge groove 603 by a scum scraping plate 6071 of a slag scraper, clear water at the lower layer is collected into a clear water groove 604 through a water collecting pipe 608, part of the clear water flows back for use of the dissolved air water, and the other part of the remaining clear water is discharged through an overflow port.

In detail, the first coagulation tank 30, the first flocculation tank 40, and the reaction tank 50 may have various known structures, their communication structures and the communication structures with the air floatation tank 60 may have various known structures, and the air floatation tank 60, the dissolved air releaser 606, the air supply device 605, the connection relationship thereof, the distribution position of each area, and the like are known technologies, and are not focused on the present solution, and the structure of the slag scraper 607 is described below with emphasis.

As shown in fig. 3, the slag scraper 607 includes a pair of first chain wheels 6072 and a pair of second chain wheels 6073, the pair of first chain wheels 6072 are symmetrically and rotatably disposed above one end of the separation area 602, the pair of second chain wheels 6073 are rotatably disposed above the other end of the separation area 602, specifically, the pair of chain wheels are disposed on a shaft 6074 rotatably erected above the separation area, the first chain wheels 6072 and the second chain wheels 6073 on the same side are connected through chains 6075, and at least one slag scraping plate 6071, preferably two slag scraping plates 6071, are connected to the two chains 6075 and distributed at two ends of the chains; the first sprocket 6072 or the second sprocket 6073 is connected with a power device for driving the first sprocket 6072 or the second sprocket 6073 to rotate, the power device comprises a motor 6076, and the motor 6076 is connected with a shaft 6074 where the first sprocket 6072 or the second sprocket 6073 is located through a belt transmission structure or a sprocket transmission structure or a gear transmission structure 6077.

In addition, when the slag scraper 607 works, part of the flocs are deposited to the bottom of the tank due to gravity, so that the deposited flocs need to be timely removed to avoid affecting the quality of the effluent water, therefore, as shown in fig. 3, in a feasible embodiment, the bottom of the air floatation tank 60 is of an inverted trapezoid structure 6010, the front end gradient is smaller than the rear end gradient, a sludge discharge groove 6020 is arranged at the slope bottom position of the air floatation tank, the sludge discharge groove 6020 is provided with a sludge discharge pipe, the sludge discharge groove 6020 is provided with an automatic valve for controlling the sludge discharge operation, and the timing sludge discharge can be realized by remotely controlling the opening and closing of the automatic valve.

Further, as shown in fig. 3, in order to quickly collect the sludge at the front end of the inverted trapezoid 6010 at the sludge discharge groove 6020, the air floatation tank further includes a sludge scraper 6030 which is capable of scraping the sludge at the bottom area of the front end of the inverted trapezoid 6010 into the sludge discharge groove 6020, and has a specific structure identical to that of the sludge scraper 607 described above, and is driven by the same motor as that of the sludge scraper 607, and in operation, the sludge deposited at the bottom of the tank is scraped to the sludge discharge groove by the bottom sludge scraper and then discharged.

The bottom of the pool is made into a certain gradient and is provided with a pool bottom slag scraping device, only one mud discharging pipe is needed, and mud is discharged regularly, so that the bottom mud discharging efficiency can be improved, the workload of construction and operation is reduced, and the height of the pool body is effectively reduced.

The slag scraper and the mud scraper are driven by the same motor, so that a set of power device is omitted, the driving structure is simplified, and the equipment cost is reduced.

In another possible embodiment, as shown in fig. 5, at least one sludge hopper 609 is disposed at the bottom of the air floatation tank 60, preferably two sludge hoppers 609 are disposed, wherein the front slope a of the rear sludge hopper 6091 is more than twice the front slope B of the front sludge hopper 6092, and further preferably the front slope B of the front sludge hopper 6092 is between 17±3°, the rear slope B thereof is the same as the front slope a of the rear sludge hopper 6092, and the front slope a of the rear sludge hopper 6092 is the same as the rear slope a thereof and is between 47±3°.

The design is that a period of time is needed for floc deposition, so that the amount of deposited sludge at the front end of the separation area is small, and the amount of deposited sludge at the rear end of the separation area is large, so that the gradient of the front end of the sludge bucket needs to be increased, and when the deposited sludge contacts with the inner wall of the sludge bucket, the deposited sludge can fall into the bottom of the sludge bucket more easily, and the sludge with too small gradient is prevented from being adhered to the inner wall of the sludge bucket.

Further, the pretreatment device 100 is connected to a water collection well (not shown in the figure), in which a pipe with a lift pump is provided, and the end of the pipe is connected to the deep treatment device 200.

As shown in fig. 1, the advanced treatment apparatus 200 includes a second adjusting tank 2001, a biological selection tank 2002, a biochemical treatment system 2003, a secondary sedimentation tank 2004, a second coagulation tank 2005, a second flocculation tank 2006, a high-efficiency sedimentation tank 2007, and a clean water tank 2008, which are sequentially connected.

The second regulating tank 2001 is provided with an aeration device for homogenizing the waste water therein, and the second regulating tank 2001 is provided with a PH test device (not shown) therein and is connected with a biological selection tank 2002 through a pipeline with a lifting pump, the biological selection tank 2002 is used for removing filiform bacteria in the waste water by adding a preferred strain, and the biochemical treatment system 2003 comprises the aeration device and a diving plug-flow device so as to keep zoogloea in the waste water in a suspended state, thereby fully contacting the zoogloea with the waste water and fully reacting with pollutant substances in the waste water, otherwise, if the zoogloea is deposited at the bottom of the tank, anaerobic areas are easily generated, the growth of dominant bacterial groups is unfavorable, and putrefactive and toxic gases are generated.

The secondary sedimentation tank 2004 is used for realizing solid-liquid separation of muddy water produced by the biochemical treatment system 2003, and is connected with the biological selection tank 2002 through a backflow pipeline, the separated solids are zoogloea and flow back to the biological selection tank 2002 through the backflow pipeline, the separated clear water automatically flows to the second coagulation tank 2005, and both the second coagulation tank 2005 and the second flocculation tank 2006 are provided with stirring devices for stirring and PH testing devices (not shown in the figure) for measuring PH values.

The efficient sedimentation tank 2007 may be of known structures of various sedimentation tanks, in this preferred embodiment, as shown in fig. 6, the efficient sedimentation tank includes a tank body 1, a water inlet 2 and a water outlet 3 are formed on the tank body 1, the water inlet 2 is communicated with a water distribution chamber 4 in the tank body 1, two sides of the water distribution chamber 4 respectively form sedimentation areas 5, a group of parallel inclined plates 6 are obliquely arranged in each sedimentation area 5, the inclined plates 6 are flat plates, a water outlet area 7 is arranged at the front ends of the water distribution chamber 4 and the sedimentation areas 5, the water outlet area 7 is communicated with the sedimentation areas 5, and the water outlet 3 is arranged at the bottom of the water outlet area 7.

When the sewage treatment device works, sewage enters the water distribution chamber 4 from the water inlet 2 and then is distributed into the sedimentation areas 5 at two sides of the water distribution chamber, the sewage gradually rises to the inclined plate 6 along with the continuous inflow of the sewage, suspended matters in the sewage are contacted with the inclined plate 6 so as to stop moving upwards and slide down along the inclined plate 6 to sink to the bottom of the tank body 1 under the action of self gravity, and clear water continuously rises to a certain height and then flows into the water outlet area 7 and flows out from the water outlet 3.

In detail, as shown in fig. 7, the tank body 1 includes an upper portion 11, a middle portion 12 and a lower portion 13 integrally formed from top to bottom, wherein the cross-sectional dimension of the upper portion 11 is larger than that of the middle portion 12, and the upper portion is divided into two areas by a partition 9, one area is communicated with the space of the middle portion 12, the other area is separated from the space of the middle portion 12, the middle portion 12 is obliquely arranged, and the lower portion 13 is preferably a sludge hopper, so that the sludge discharge can be effectively realized.

As shown in fig. 7, the water inlet 2 is positioned at a high position of the tank body 1, specifically, on one side panel of the upper portion 11, and the axial direction of the water inlet 2 is perpendicular or parallel to the partition 9, while the inflow rate is controlled to be 10mm/s or less.

As shown in fig. 7, the water distribution chamber 4 includes two opposite side plates 41 extending from the inner wall of the panel on the side where the water inlet 2 is located to the side plates of the partition 9 and the middle part 12 on the other side, and the side plates 41 extend from the upper part 11 to the lower part 13 of the tank body 1, and meanwhile, the side plates 41 may be flat plates or curved plates, preferably flat plates, so that the cross section of the water distribution chamber 4 presents a rectangular shape.

As shown in fig. 8, a group of water distribution ports 42 are uniformly distributed on the two side plates 41 of the water distribution chamber 4 below the inclined plate 6, so that the channel of the sewage in the water distribution chamber 4 into the sedimentation zone 5 is increased, thereby ensuring the uniformity of water distribution, and in addition, when sludge is accumulated at the tail end of the inclined plate 6, the sewage can be distributed into the sedimentation zone 5 through the water distribution ports 42.

In addition, in order to avoid the problem that the water distribution chamber 4 and the water distribution openings 42 cannot be uniformly covered due to the excessively wide precipitation area 5, the width of each precipitation area 5 is preferably controlled to be 1±0.2m, so that the uniformity of water distribution can be ensured.

The inclined plates 6 can be various feasible smooth-surface plates, such as PVC plates or PP plates, and each inclined plate 6 is independently arranged in the sedimentation zone, and the included angle between the inclined plates and the horizontal plane is 50-60 degrees, so that the optimal filtering effect can be achieved; meanwhile, each inclined plate 6 is in sealing connection with the inner wall of the tank body 1 and the side plate 41 of the water distribution chamber 4 or in micro-gap arrangement, for example, the gaps between the inclined plates are not more than 5mm, mounting brackets can be arranged on the tank wall and the side plate 41 of the water distribution chamber in specific mounting, the adjacent brackets are spaced by about 50mm, the inclined plates 6 are respectively connected with two brackets with opposite positions through bolts, when in sealing connection, as shown in fig. 6, grooves can be formed in the inner wall of the tank body and the side plate 41, and each inclined plate 6 is clamped at the grooves through rubber sealing strips 14 which can be clamped in the grooves.

Further, in order to prevent deformation of the inclined plate 6, thereby causing a problem of changing a gap between adjacent inclined plates and affecting uniformity of a water channel, a set of guide plates (not shown in the figure) are arranged on a surface of the inclined plate 6 facing away from the bottom of the tank body 1, and the guide plates are about 50mm wide and are distributed along the water flow direction, so that strength of the inclined plate 6 can be increased, and deformation of the inclined plate caused by water flow impact is avoided.

As shown in fig. 6 and 7, each sedimentation zone 5 is communicated with the water outlet zone 7 through at least one water outlet channel 8, specifically, the water outlet channel 8 is located above the inclined plate 6 in the sedimentation zone 5, and the top is not higher than the top of the water inlet 2, in addition, since the water outlet channel 8 is installed in the tank body, the water outlet weir plates on two sides generate uneven water in the running process due to unequal heights caused by sedimentation of the tank body or other factors, so that the height of the water outlet weir plates 81 on two sides of the water outlet channel 8 is adjustable, and the sedimentation device is realized by the following structure:

as shown in fig. 9, the water outlet channel 8 includes a saddle 82 and a channel-shaped water channel with a water outlet weir plate 81 as a side plate, a set of long bolts 83 are vertically arranged on the top surface of the saddle 82, through holes which can be penetrated by the long bolts 83 are arranged on a base plate 84 of the channel-shaped water channel, when the water outlet channel is actually installed, a supporting nut 85 is firstly installed on each long bolt 83 and is made to be equal in height, then the through holes on the base 84 are respectively penetrated by one long bolt 83, at this time, the base 84 is supported by a set of supporting nuts 85, and finally, each long bolt 83 is screwed by a fixing nut 86 to fix the position of the base 84 if necessary. When the height of the water outlet weir plate 81 needs to be adjusted, the heights of the support nuts 85 and the fixing nuts 86 on the corresponding sides are adjusted, so that the water outlet weir plates 81 on the two sides can be kept at the same height.

In addition, in order to solve the problem that the filtering effect is affected by the sludge accumulation on the inclined plate 6, as shown in fig. 7, a dredging device 10 is further disposed at the bottom of the inclined plate 6, the dredging device 10 includes a set of air pipes 101 with air outlet holes 102, the air pipes 101 are preferably UPVC pipes, of course, may be pipes made of other materials, and are disposed at a position 400mm±50mm below the inclined plate 6, and are preferably disposed in a direction parallel to the axis of the water inlet 1, and are connected to a compressed air supply device (not shown) through an air supply pipe (not shown), and by supplying air to the air pipes 101, air is blown out by the air outlet holes 102 to form air bubbles at the bottom of the inclined plate 6, and the air bubbles generate strong disturbance to each inclined plate 6 in the rising process, so that the sludge accumulated on the inclined plate 6 can generate power due to vibration to drive the sludge to sediment, thereby realizing the dredging effect.

Finally, when the lower portion 13 is a sludge bucket, as shown in fig. 10, the inclination angle of the side wall 131 of the sludge bucket (the included angle between the side wall 131 of the sludge bucket and the bottom plate 132 of the sludge bucket) is 15±5°, so that the volume of the sludge bucket is greatly increased, and the concentration rate of sludge is improved; meanwhile, the sedimentation tank with high sludge concentration rate is further provided with a sludge scraper 20, the sludge scraper 20 comprises a driving motor 201, a transmission shaft 202 and a scraper 203, the motor 201 is arranged at the top of the sedimentation tank, the transmission shaft 202 extends to the bottom of the sludge hopper from the top, the scraper 203 is distributed in an umbrella shape, the inclination angle of the scraper 203 is close to that of the side wall 131, so that sludge can be stirred through low-custom rotation of the scraper 203, the sludge has enough fluidity, and the sludge discharging effectiveness is guaranteed.

Further, as shown in fig. 1, the efficient printing and dyeing wastewater treatment system further comprises a sludge treatment device 300 connected with the efficient sedimentation tank 2007, the sludge treatment device 300 comprises a sludge concentration tank 3001 connected with the efficient sedimentation tank 2007, the sludge concentration tank 3001 is connected with a plate-frame filter press device 3002, and sludge generated by the plate-frame filter press device 3002 is transported outwards through a transporting device 3003; the air floatation machine 1002, the biological selection tank 2002, and the secondary sedimentation tank 2004 are connected to the sludge concentration tank 3001, and sludge generated by these are discharged into the sludge concentration tank 3001 for treatment.

When the efficient printing and dyeing wastewater treatment system works, the process is as follows:

s1, introducing the collected desizing wastewater and/or alkali deweighting printing and dyeing wastewater into a first regulating tank 1001, adding sulfuric acid, regulating the pH value of the wastewater to 3-4, preferably about 4, adding polyiron through a pipeline mixer, coagulating and precipitating, and then entering an air floatation tank, wherein after part of pollutants (PVA and/or terephthalic acid) are removed by the air floatation tank, the wastewater enters a water collecting well; the separated sludge enters the sludge concentration tank 3001.

S2, lifting the wastewater in the water collecting well into a second regulating tank 2001 by a lifting pump, homogenizing the wastewater, lifting the wastewater to the biological selection tank 2002, and removing filamentous bacteria by using dominant bacteria, wherein the dominant bacteria are preferably bacteria such as alcaligenes, bacillus, flavobacterium, zoogloea, pseudomonas, escherichia coli and comamonas, so that the removal effect of the bacteria in the wastewater can be improved.

The sewage passing through the biological selection pool 2002 enters the biochemical treatment system 2003, and the rotating speed of the shallow plug flow equipment in the biochemical treatment system 2003 is 30-50rpm, so that the average water flow speed in the pool reaches about 0.3m/s, thereby ensuring that zoogloea is in a suspension state and degrading main pollutants.

The sewage treated by the biochemical treatment system 2003 enters the secondary sedimentation tank 2004 to complete solid-liquid separation of the sewage, the separated zoogloea is lifted by a pump to flow back to the biological selection tank 2002, and the supernatant automatically flows into the second coagulation tank 2005.

Adding a coagulant PAC into the second coagulation tank 2005 to bond and aggregate colloid particles in water to form insoluble particles; then introducing the wastewater in the second coagulation tank 2005 into a second flocculation tank 2006, adding flocculant PAM, further improving the particle size of insoluble particles so as to improve the subsequent precipitation effect; after the wastewater of the second flocculation basin 2006 is introduced into the efficient sedimentation basin 2007, separation of suspended matters and liquid is achieved.

The separated clean water flows into a clean water tank 2008, is discharged after reaching standards, the separated sludge is lifted into a sludge concentration tank 3001 by a water pump, enters a plate-frame filter press device 3002 for filter pressing after concentration, is transported and treated by an outward transportation device 3003, and the filtrate flows into the second regulating tank.

The invention has various embodiments, and all technical schemes formed by equivalent transformation or equivalent transformation fall within the protection scope of the invention.

Claims (3)

1. The utility model provides a high-efficient printing and dyeing wastewater treatment system for desizing and/or alkali decrement printing and dyeing wastewater treatment, its characterized in that: comprises a pretreatment device (100) and a deep treatment device (200), wherein the pretreatment device (100) comprises a first regulating tank (1001) capable of separating PVA and/or terephthalic acid from desizing and/or alkali-reduced printing and dyeing wastewater and an air flotation machine (1002) for separating separated slurry from wastewater;

the air floatation machine comprises a first coagulation tank (30), a first flocculation tank (40), a reaction tank (50) and an air floatation tank (60) which are sequentially communicated, wherein the air floatation tank (60) comprises a contact area (601), a separation area (602), a slag discharging groove (603) and a clear water groove (604), a group of dissolved air releasers (606) connected with air supply equipment (605) are arranged in the contact area (601), the separation area (602) and the clear water groove (604) are communicated through a water collecting pipe (608) with a water inlet hole (6081), the water inlet hole (6081) is positioned at the lower half part of the water collecting pipe (608), and the included angle between the axis of the water inlet hole and the horizontal plane is 45 DEG +/-5 DEG; the bottom of the air floatation tank is of an inverted trapezoid structure, the gradient of the front end of the air floatation tank is smaller than that of the rear end of the air floatation tank, a sludge discharge groove is formed in the position of the gradient bottom of the air floatation tank, and a sludge discharge pipe is arranged in the sludge discharge groove; the floating pond further comprises a mud scraper which can scrape the mud in the bottom area of the front end of the inverted trapezoid structure into the mud discharge groove, the structure of the mud scraper is the same as that of a slag scraper of the floating pond, and the mud scraper and the slag scraper are driven by the same motor;

the advanced treatment device (200) comprises a second regulating tank (2001), a biological selection tank (2002), a biochemical treatment system (2003), a secondary sedimentation tank (2004), a second coagulation tank (2005), a second flocculation tank (2006), a high-efficiency sedimentation tank (2007) and a clean water tank (2008) which are connected in sequence;

the biochemical treatment system (2003) comprises an aeration device and a diving plug flow device, wherein the rotation speed of the diving plug flow device is between 30 and 50 rpm;

the efficient sedimentation tank (2007) comprises a tank body (1), a water inlet (2) and a water outlet (3) are formed in the tank body (1), the water inlet (2) is communicated with a water distribution chamber (4) in the tank body (1), sedimentation areas (5) are respectively formed on two sides of the water distribution chamber (4), a group of parallel inclined plates (6) are obliquely arranged in each sedimentation area (5), each inclined plate (6) is a flat plate, the sedimentation areas (5) are communicated with a water outlet area (7), and the water outlet (3) is formed in the bottom of each water outlet area (7); the tail end of the water distribution chamber (4) extends to the lower part of the inclined plate (6), and a group of water distribution ports (42) are uniformly distributed on two side plates (41) of the water distribution chamber (4) and are positioned below the inclined plate (6); each inclined plate (6) is connected with the inner wall of the tank body (1) and a side plate (41) of the water distribution chamber (4) in a sealing way or keeps a micro gap; the water outlet areas (7) are communicated with each sedimentation area (5) through at least one water outlet channel (8), and the heights of water outlet weir plates (81) on two sides of the water outlet channels (8) are adjustable; a dredging device (10) capable of cleaning sludge on the inclined plate (6) through bubbles is arranged below the inclined plate (6), and the dredging device (10) comprises an air pipe (101) with a group of air holes (102), and the air pipe is connected with a compressed gas supply device; the bottom of the tank body (1) is provided with a sludge hopper, the side wall inclination angle of the sludge hopper is not more than 20 degrees, and the sludge scraper (20) is capable of stirring sludge in the sludge hopper.

2. The efficient printing and dyeing wastewater treatment system of claim 1, wherein: the device also comprises a sludge treatment device (300) connected with the air floatation machine (1002) and the high-efficiency sedimentation tank (2007).

3. The method for efficient printing and dyeing wastewater treatment of the efficient printing and dyeing wastewater treatment system according to claim 1, wherein: the method comprises the following steps:

s1, adding sulfuric acid into desizing and/or alkali reduction printing and dyeing wastewater, adjusting the pH value to 3-4, adding polyiron into the wastewater for coagulation, and introducing the coagulated wastewater into an air floatation machine for solid-liquid separation;

s2, introducing the wastewater subjected to the step S1 into a deep treatment device, performing biochemical treatment, coagulating sedimentation, and discharging the clear water after reaching the standard.