CN210855707U - High basicity high concentration printing and dyeing wastewater anaerobic pretreatment system - Google Patents
High basicity high concentration printing and dyeing wastewater anaerobic pretreatment system Download PDFInfo
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Abstract
The utility model relates to a sewage treatment technical field discloses a high basicity high concentration printing and dyeing wastewater anaerobic pretreatment system, including high concentration waste water equalizing basin, high-pressure microbubble CO that connect gradually2Absorption tower and anaerobic reactor, high pressure microbubble CO2Absorption tower and CO2Storage system connection, CO2The storage system comprises liquid CO connected in sequence2Storage tank, CO2Vaporizer and gas pressure-regulating device, high-concentration wastewater regulating tank and high-pressure microbubble CO2A first water diversion tank and a first lift pump which are respectively connected with the absorption tower and the absorption tower are arranged between the absorption tower and the high-pressure microbubble CO2Between the absorption tower and the anaerobic reactor are respectively arrangedAnd the second water diversion tank and the second lift pump are connected. The utility model adopts CO2The pH value of the sewage is regulated, so that the reactor cannot be corroded, the sulfate reducing bacteria cannot be massively propagated, the COD removal effect is influenced, the alkalinity of the wastewater cannot be reduced, and the generation of alkali callback cost is avoided.
Description
Technical Field
The utility model belongs to the technical field of the sewage treatment technique and specifically relates to a high basicity high concentration printing and dyeing wastewater anaerobic pretreatment system is related to.
Background
The printing and dyeing wastewater is a main source of pollution in the textile industry, and the discharged wastewater mainly comprises the following components: dyeing water: the low-concentration wastewater has moderate chroma and low COD (500-1000 mg/L), is the main sewage discharged by a printing and dyeing mill and generally accounts for 50-60% of the discharge amount; printing water: the method has the advantages that the low-concentration wastewater is high in chroma, moderate in COD (1500-2500 mg/L), high in ammonia nitrogen and total nitrogen, and generally accounts for 20-30% of the main discharge amount of the wastewater discharged by a printing and dyeing mill; desizing wastewater: the high-concentration wastewater has high COD (8000-18000 mg/L) and high alkalinity, is sewage discharged by pure cotton pretreatment in a printing and dyeing mill, and generally accounts for 5-10% of the discharge amount; alkali weight reduction water: the high-concentration wastewater has extremely high COD (12000-30000 mg/L) and extremely high alkalinity, is sewage discharged by chemical fiber pretreatment of a printing and dyeing mill, and generally accounts for 5-10% of the discharge amount of the sewage; and (3) other wastewater: such as mercerizing wastewater, setting machine wastewater, preshrinking wastewater and the like. The high-concentration wastewater in the printing and dyeing wastewater mainly refers to desizing wastewater and alkali reduction wastewater, and the two wastewater streams are difficult to treat in the printing and dyeing industry due to poor biochemical (aerobic) property and high alkalinity, so that the treatment cost is very high.
In the prior art, the conventional treatment method of desizing wastewater in printing and dyeing wastewater mainly comprises a physical and chemical method or an anaerobic method, for example, the publication of "a treatment method of high-concentration printing and dyeing desizing wastewater" in Chinese patent literature, the publication number is CN104829046B, and the steps are as follows: the desizing wastewater is discharged from a UASB anaerobic tank, sequentially enters a coagulating sedimentation tank, an aeration activated sludge reaction tank and a hydrolysis acidification tank, denitrification, sulfur oxidation, sludge adsorption and proliferation and sludge concentration are simultaneously carried out in the hydrolysis acidification tank, nitrate oxygen in an aerobic tank is recovered, suspended particles in the UASB anaerobic tank are adsorbed and clarified, discharged into a contact oxidation tank, and finally discharged after being precipitated and reaching the standard.
But the physicochemical method for treating the desizing wastewater has the disadvantages of large dosage, high medicament cost, very large amount of generated sludge and too high COD of the effluent, and cannot meet the treatment requirement. When the desizing wastewater is treated by the anaerobic method, a large amount of sulfuric acid or hydrochloric acid is consumed for adjusting the pH value, the use of hydrochloric acid easily causes corrosion of a reactor and a pipeline, the service life is short, the use of sulfuric acid causes mass propagation of sulfate reducing bacteria, biogas cannot be produced or contains a large amount of impurity hydrogen sulfide, and the removal effect of the anaerobic method on organic matters cannot be maximized.
The conventional treatment method of the alkali-reduction wastewater includes an acid precipitation method or an alkali precipitation method, for example, an "alkali-reduction wastewater acid precipitation system" disclosed in chinese patent literature, publication No. CN205500880U, which includes an alkali-reduction wastewater raw water tank, an acid adding device, a confluence device, a mixing tank, and an automatic pH monitoring and controlling device.
However, when the acid precipitation method is used for treating the alkali-reduction wastewater, a large amount of sulfuric acid is consumed for adjusting the pH value, the acid adjustment cost is high, and the alkalinity of the comprehensive wastewater treatment system is easily insufficient when the wastewater is discharged into the comprehensive wastewater. When the alkaline precipitation method is adopted, a large amount of lime needs to be added, the hardness of effluent is high, the conductivity and hardness of comprehensive wastewater are increased, and the membrane treatment and recycling are greatly influenced.
Disclosure of Invention
The utility model aims to overcome the defects that in the prior art, when desizing wastewater and alkali decrement wastewater in printing and dyeing wastewater are treated and pH is adjusted by adding acid, a reactor and a pipeline are easy to corrode, and the service life of treatment equipment is shortened; the use of sulfuric acid can cause mass propagation of sulfate reducing bacteria, the methane cannot be produced or contains a large amount of impurity hydrogen sulfide, and the removal effect of the anaerobic treatment on organic matters cannot meet the treatment requirement; and the alkalinity of the wastewater is reduced due to the addition of acid, and a water purifying medicament needs to be added again, so that the alkali adjustment cost is generated, and the treatment cost is increased2The pH value of the sewage is adjusted, the corrosion of a reactor and the mass propagation of sulfate reducing bacteria can not be caused, and the biological activity of anaerobic microorganisms can not be generatedThe COD concentration of the effluent is low due to inhibition; meanwhile, the alkalinity of the wastewater can not be reduced, and the cost for adjusting back the alkali is avoided.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-alkalinity high-concentration printing and dyeing wastewater anaerobic pretreatment system comprises a high-concentration wastewater adjusting tank and high-pressure micro-bubble CO sequentially connected2An absorption tower and an anaerobic reactor, the high-pressure microbubble CO2Absorption tower and CO2Storage system connection, said CO2The storage system comprises liquid CO connected in sequence2Storage tank, CO2Vaporizer and gas pressure-regulating device, high-concentration wastewater regulating tank and high-pressure microbubble CO2A first water diversion tank and a first lift pump which are connected are arranged between the absorption towers, the first water diversion tank is connected with the water outlet end of the high-concentration wastewater adjusting tank, and the first lift pump is connected with the high-pressure microbubble CO2Absorption tower connected, the high pressure microbubble CO2A second water diversion tank and a second lift pump which are connected are arranged between the absorption tower and the anaerobic reactor, and the second water diversion tank and the high-pressure microbubble CO are connected2The absorption tower is connected, and the second lift pump is connected with the anaerobic reactor.
The pretreatment process for the high-alkalinity high-concentration printing and dyeing wastewater by using the pretreatment system comprises the following steps:
(1) carrying out rough filtration on the printing and dyeing wastewater through a high-concentration wastewater regulating tank;
(2) the wastewater after rough filtration enters high-pressure microbubble CO through a first water diversion tank and a first lift pump2Adjusting the pH value of the wastewater in the absorption tower;
(3) the wastewater after pH adjustment enters an anaerobic reactor through a second water diversion tank and a second lift pump for anaerobic treatment, organic matters in the wastewater are degraded, and the effluent of the anaerobic reactor enters a wastewater comprehensive treatment system for post-treatment.
The utility model utilizes the acid gas CO firstly2The pH value of the printing and dyeing wastewater can be adjusted to be below 9.5 by adjusting the pH value of the printing and dyeing wastewater with high alkalinity, then the printing and dyeing wastewater enters an anaerobic reactor for anaerobic treatment, and CO is also generated in methane in the later stage of the anaerobic treatment2Can further reduce the pH value of the wastewater and the anaerobic reactor outletThe final pH value of the water can be reduced to be below 9.0, so that the pH value of the wastewater is effectively reduced, the load of a subsequent wastewater comprehensive treatment section is lightened, the alkalinity of the wastewater cannot be reduced, and the alkali callback cost caused by adding a water purifying medicament is not needed or reduced.
At the same time, CO is used2The pH value of the wastewater is adjusted, sulfate radicals and chloride ions are not introduced, so that the reactor cannot be corroded, sulfate reducing bacteria cannot be propagated in large quantity, the biogas cannot be produced, or the concentration of hydrogen sulfide in the biogas is too high to be beneficial to resource utilization, the biological activity of anaerobic microorganisms cannot be inhibited, the treatment effect on organic matters is good, and the COD value of the final effluent meets the requirement of subsequent treatment. And CO2Less dangerous, compared with sulfuric acid and hydrochloric acid storage tanks, liquid CO2The safety risk of the storage tank is small.
The utility model firstly uses liquid CO2Stored in liquid CO2In the storage tank, CO is firstly passed through when in use2Vaporizer for liquid CO2Vaporizing, and then passing CO through gas pressure regulator2The gas pressure is adjusted to the use requirement, and then high-pressure microbubble CO is introduced2The reaction is carried out in the absorption tower. Because of liquid CO2Temperature and CO2Has a very low vaporization temperature (CO)2Boiling point-56.6 deg.C), so the vaporized low-temperature CO is removed2Introducing high-pressure microbubble CO2After the waste water is absorbed in the absorption tower, the waste water with the general temperature of 55-65 ℃ can be cooled to 35-40 ℃ to meet the requirement of medium-temperature anaerobic temperature, and the waste water does not need to be cooled by a cooling tower, so that the treatment steps are simplified, and the treatment cost is reduced.
As preferred, the high concentration waste water equalizing basin end of intaking is equipped with the grid well, is equipped with mechanical grid in the grid well, is equipped with first pH measuring device and liquid level control device in the high concentration waste water equalizing basin. A grid well and a mechanical grid are arranged in the high-concentration wastewater adjusting tank, so that impurities such as fine fluff, thread ends, short fibers and the like in wastewater can be removed; the liquid level control devices such as a liquid level switch and the like are arranged, so that the water level in the tank can be kept stable, and the subsequent treatment is facilitated; the first pH measuring device is arranged to monitor the inlet pH of the wastewater in real time, so that the subsequent high-pressure microbubble CO can be conveniently arranged2Absorption column and CO2Parameters of the system are stored.
Preferably, the high pressure microbubble CO2A second pH measuring device and microporous CO positioned at the bottom of the absorption tower are arranged in the absorption tower2The releaser, the filler positioned in the middle of the absorption tower and the high-pressure spray device positioned at the top of the absorption tower, and the microporous CO is sprayed into the absorption tower2The releaser is connected with the gas pressure regulating device, and the high-pressure spraying device is connected with the first lifting pump.
The effluent of the high-concentration wastewater adjusting tank enters high-pressure microbubble CO through a first water diversion tank and a first lift pump2The absorption tower is sprayed into the absorption tower through a high-pressure spraying device at the top and falls down; and CO subjected to pressure regulation2Gas passing through the microporous CO at the bottom2The releaser is blown in and moves upwards to contact and react with the falling wastewater, so that the pH value of the wastewater is reduced; the packing positioned in the middle of the absorption tower is used for increasing the contact area of gas and liquid so as to ensure that the gas and the liquid fully react. The high-pressure microbubble CO of the utility model2Blowing CO into the absorption tower by adopting a micropore releaser2The traditional perforation aeration is replaced, the micropore releaser can form smaller bubbles, the gas-liquid contact area is increased, and the efficient absorption of carbon dioxide is facilitated.
Preferably, CO is2Storage system and high-pressure microbubble CO2A buffer tank is arranged between the absorption towers, the air inlet end of the buffer tank is connected with the gas pressure regulating device, and the air outlet end of the buffer tank is connected with the microporous CO2The releaser is connected. In CO2Storage system and high-pressure microbubble CO2A buffer tank is arranged between the absorption towers, which is favorable for adjusting CO2The air input of the gas can adjust the treatment parameters according to different inlet water pH values.
Preferably, a perforated water distribution system positioned at the bottom of the reactor, a three-phase separator positioned at the top of the reactor and an annular water collecting device positioned between the perforated water distribution system and the three-phase separator are arranged in the anaerobic reactor, the perforated water distribution system is connected with a second lift pump, an anaerobic circulating pump is arranged outside the anaerobic reactor, one end of the anaerobic circulating pump is communicated with the second lift pump through a pipeline, and the other end of the anaerobic circulating pump is connected with the annular water collecting device.
High pressure microbubble CO2Absorption towerThe effluent enters a perforated water distribution system in the anaerobic reactor through a second water diversion tank and a second lift pump, is pumped from the bottom of the anaerobic reactor through the perforated water distribution system and is fully mixed with anaerobic granular sludge in the reactor, most organic substances are converted into biogas after reaction, a three-phase separator can well separate the biogas, water and sludge, the biogas enters a gas collection chamber from the top, wastewater flows into a subsequent treatment system, and anaerobic sludge flows back to a sludge bed. And simultaneously, the utility model discloses still set up annular water-collecting device and anaerobic circulating pump in anaerobic reactor, can make the partial anaerobism that gets into among the annular water-collecting device go out the water through anaerobic circulating pump and realize the circulation, be favorable to make full use of anaerobism to go out the water and dilute the intaking to further reduce into water pollutant concentration and pH. The perforation water distribution system arranged at the bottom can distribute water uniformly, so that the sludge bed at the bottom of the anaerobic reactor is always in a suspension expansion state, the sludge-water mixing effect is greatly improved, and the treatment effect is improved.
Preferably, the three-phase separator comprises a plurality of groups of gas separation plates positioned below, a gas collection chamber positioned above and a gas riser connecting the gas separation plates and the gas collection chamber, a settling zone positioned between the gas separation plates and the gas collection chamber is arranged in the anaerobic reactor, the settling zone is provided with a water outlet weir, each group of gas separation plates comprises two reflecting plates arranged in an inverted V shape, and the upper ends of the reflecting plates are connected with the gas riser.
After the waste water is mixed and contacted with the sludge in the anaerobic reactor, the microorganisms in the sludge can decompose the organic matters in the waste water and convert the organic matters into methane. Biogas is continuously discharged in a micro-bubble form, the micro-bubbles are continuously combined in the ascending process to gradually form larger bubbles, an area with thinner sludge concentration is formed at the upper part of a sludge bed due to the stirring of the biogas, the sludge and water ascend together and enter a three-phase separator, and when the biogas touches a reflecting plate at the lower part of the separator, the biogas is folded to the periphery of the reflecting plate and then passes through a water layer and enters a gas collection chamber through an air lift pipe; the solid-liquid mixed liquid enters a settling zone through reflection, sludge in the wastewater is flocculated, particles are gradually increased, and the sludge is settled under the action of gravity and returns to the bottom of the anaerobic reactor; the treated effluent separated from the sludge overflows from the upper part of an effluent weir of the settling zone and enters a subsequent comprehensive treatment section.
Preferably, a sludge discharge pump is arranged outside the anaerobic reactor, and the sludge discharge pump is connected with the bottom of the anaerobic reactor. A sludge discharge pump connected with the bottom of the anaerobic reactor is arranged outside the anaerobic reactor, so that sludge without activity can be discharged in time.
Preferably, the anaerobic pretreatment system further comprises a biogas collection and storage system, the biogas collection and storage system comprises a first biogas desulfurization tower, a second biogas desulfurization tower, a water condensation cylinder and a biogas storage cabinet which are sequentially connected, the first biogas desulfurization tower is connected with the anaerobic reactor, and desulfurization fillers are arranged in the first biogas desulfurization tower and the second biogas desulfurization tower. The biogas collection and storage system connected with the anaerobic reactor is arranged, biogas is desulfurized through the desulfurization fillers in the two desulfurization towers, then moisture in the biogas is removed through the condensing cylinder, and finally the biogas enters the biogas storage cabinet, so that the biogas generated in the anaerobic reactor can be collected and utilized, and the effective utilization of energy is realized.
Therefore, the utility model discloses following beneficial effect has:
(1) by using CO2Adjusting pH and CO of wastewater2The pH value of the wastewater can be reduced, but the alkalinity of the wastewater can not be reduced, which is beneficial to reducing the cost of the comprehensive wastewater medicament (namely, the alkali adjustment cost caused by adding a water purifying medicament is not needed or reduced);
(2) by using CO2The pH value of the wastewater is adjusted, sulfate radicals and chloride ions are not introduced, so that the corrosion of a reactor is avoided, sulfate reducing bacteria are not propagated in large quantities, the methane cannot be produced, or the concentration of hydrogen sulfide in the methane is too high to be beneficial to resource utilization, the biological activity of anaerobic microorganisms cannot be inhibited, and the COD treatment effect is improved;
(3) the temperature of the high-alkalinity high-concentration wastewater is generally 55-65 ℃, the temperature of the wastewater can be reduced to 35-40 ℃ through carbon dioxide aeration, the requirement of medium-temperature anaerobic temperature is met, and cooling of a cooling tower is not needed;
(4)CO2less dangerous, compared with sulfuric acid and hydrochloric acid storage tanks, liquid CO2The safety risk of the storage tank is small.
Drawings
Fig. 1 is a schematic view of a connection according to the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure: 1 high-concentration wastewater adjusting tank, 101 grid well, 102 mechanical grid, 103 first pH measuring device, 104 liquid level control device and 2 high-pressure microbubble CO2Absorption tower, 201 second pH measuring device and 202 micropore CO2Releaser, 203 packing, 204 high-pressure spray device, 3 anaerobic reactor, 301 perforated water distribution system, 302 triphase separator, 3021 gas separation plate, 3022 gas collection chamber, 3023 air riser, 3024 settling zone, 3025 effluent weir, 303 annular water collection device, 4 liquid CO2Storage tank, 5CO2The device comprises a vaporizer, a 6-gas pressure regulating device, a 7-first water diversion tank, a 8-first lift pump, a 9-second water diversion tank, a 10-second lift pump, a 11 buffer tank, a 12-anaerobic circulating pump, a 13-sludge pump, a 14-first biogas desulfurization tower, 1401 desulfurization fillers, a 15-second biogas desulfurization tower, a 16-water condensation cylinder and a 17-biogas gas storage cabinet.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
The utility model provides an attached drawing is only the structure and the connection schematic diagram of each device, does not represent actually putting and the pipe laying. The utility model discloses instrument and device that well use do not have the specification and are conventional instrument and device among the prior art, not the utility model discloses a key.
As shown in figure 1, the anaerobic pretreatment system for high alkalinity and high concentration printing and dyeing wastewater adopted in the embodiments of the present invention comprises a high concentration wastewater adjusting tank 1, high pressure micro-bubble CO and a pre-treatment device connected in sequence2An absorption tower 2 and an anaerobic reactor 3, high pressure microbubble CO2Absorption tower and CO2Storage system connection, CO2The storage system comprises liquid CO connected in sequence2Storage tank 4, CO2A vaporizer 5 and a gas pressure regulator 6.
The high concentration waste water equalizing basin end of intaking is equipped with grid well 101, is equipped with mechanical grid 102 in the grid well, is equipped with in the high concentration waste water equalizing basinA first pH measuring device 103 and a liquid level control device 104. High pressure microbubble CO2A second pH measuring device 201 and microporous CO positioned at the bottom of the absorption tower are arranged in the absorption tower2A releaser 202, a packing 203 positioned in the middle of the absorption tower and a high-pressure spray device 204 positioned at the top of the absorption tower, wherein the packing is pall ring packing. The anaerobic reactor is internally provided with a perforated water distribution system 301 positioned at the bottom of the reactor, a three-phase separator 302 positioned at the top of the reactor and an annular water collecting device 303 positioned between the perforated water distribution system and the three-phase separator. As shown in fig. 2, the three-phase separator includes a plurality of sets of gas separation plates 3021 located below, a gas collection chamber 3022 located above, and a gas riser pipe 3023 connecting the gas separation plates and the gas collection chamber, a settling zone 3024 located between the gas separation plates and the gas collection chamber is provided in the anaerobic reactor, the settling zone is provided with a water outlet weir 3025, each set of gas separation plates includes two reflection plates arranged in an inverted V shape, and the upper ends of the reflection plates are connected to the gas riser pipe.
High concentration wastewater regulating reservoir and high pressure microbubble CO2A first water diversion tank 7 and a first lifting pump 8 which are connected are arranged between the absorption towers, the first water diversion tank is connected with the water outlet end of the high-concentration wastewater adjusting tank, and the first lifting pump is connected with the high-pressure microbubble CO2The high-pressure spray devices in the absorption tower are connected. CO 22Storage system and high-pressure microbubble CO2A buffer tank 11 is arranged between the absorption towers, the air inlet end of the buffer tank is connected with a gas pressure regulating device, and the air outlet end of the buffer tank is connected with high-pressure microbubble CO2Microporous CO in absorption columns2The releaser is connected. High pressure microbubble CO2A second water diversion tank 9 and a second lift pump 10 which are connected are arranged between the absorption tower and the anaerobic reactor, and the second water diversion tank is connected with the high-pressure microbubble CO2The water outlet end of the absorption tower is connected, and the second lift pump is connected with a perforated water distribution system in the anaerobic reactor. An anaerobic circulating pump 12 and a sludge discharge pump 13 are arranged outside the anaerobic reactor, one end of the anaerobic circulating pump is communicated with the second lifting pump through a pipeline, the other end of the anaerobic circulating pump is connected with the annular water collecting device, and the sludge discharge pump is connected with the bottom of the anaerobic reactor.
The anaerobic pretreatment system also comprises a biogas collection and storage system, the biogas collection and storage system comprises a first biogas desulfurization tower 14, a second biogas desulfurization tower 15, a water condensation cylinder 16 and a biogas storage cabinet 17 which are sequentially connected, desulfurization fillers 1401 are arranged in the first and second biogas desulfurization towers, and the first biogas desulfurization tower is connected with a gas collection chamber in the anaerobic reactor.
The high-alkalinity high-concentration printing and dyeing wastewater anaerobic pretreatment process using the pretreatment system comprises the following steps:
(1) high basicity high concentration printing and dyeing waste water gets into the grid well from the end of intaking of high concentration waste water equalizing basin, carries out the coarse filtration to printing and dyeing waste water through mechanical grid, gets rid of debris such as tiny fine hair, end of a thread, short fiber in the waste water, through the pH value of a pH measuring device real-time supervision waste water to control follow-up technological parameter, adjust the liquid level in the high concentration waste water equalizing basin through liquid level control device, make the handling capacity remain stable.
(2) Wastewater coarsely filtered by the high-concentration wastewater adjusting tank enters the high-pressure microbubble CO through the first water diversion tank under the action of the first lifting pump2The absorption tower is sprayed into the absorption tower through a high-pressure spraying device at the top and falls down; and stored in liquid CO2Liquid CO in storage tank2By CO2The vaporizer vaporizes, then the gas pressure is adjusted to the use requirement through the gas pressure adjusting device, and the high-pressure microbubble CO enters the buffer tank2CO passing through the bottom of the absorption tower2Bubbling in CO through releaser and regulating pressure2The gas is blown from the bottom and moves upwards to contact and react with the fallen wastewater, so that the pH value of the wastewater is reduced to be less than or equal to 9.5, and the filler positioned in the middle of the absorption tower can increase the gas-liquid contact area to ensure that the gas and the liquid fully react.
(3) The wastewater after pH adjustment enters a perforated water distribution system at the bottom of the anaerobic reactor through a second water diversion tank under the action of a second lift pump, is pumped from the bottom of the anaerobic reactor through the perforated water distribution system and is fully mixed with anaerobic granular sludge in the reactor, and microorganisms in the sludge can decompose organic matters in the wastewater and convert the organic matters into methane. Biogas is continuously discharged in a micro-bubble form, the micro-bubbles are continuously combined in the ascending process to gradually form larger bubbles, an area with thinner sludge concentration is formed at the upper part of a sludge bed due to the stirring of the biogas, the sludge and water ascend together and enter a three-phase separator, and when the biogas touches a reflecting plate at the lower part of the separator, the biogas is folded to the periphery of the reflecting plate and then passes through a water layer and enters a gas collection chamber through an air lift pipe; the solid-liquid mixed liquid enters a settling zone through reflection, sludge in the wastewater is flocculated, particles are gradually increased and settled under the action of gravity and return to the bottom of the anaerobic reactor, and the inactivated sludge is discharged out of the reactor through a sludge discharge pump; the treated effluent separated from the sludge overflows from the upper part of an effluent weir of the settling zone and enters a subsequent comprehensive treatment section.
Anaerobic reactor still makes the anaerobism go out the water and realize the circulation through anaerobism circulating pump and annular water-collecting device simultaneously, is favorable to make full use of anaerobism to go out the water and dilutes into water to further reduce into water pollutant concentration and pH. The perforation water distribution system arranged at the bottom can distribute water uniformly, so that the sludge bed at the bottom of the anaerobic reactor is always in a suspension expansion state, the sludge-water mixing effect is greatly improved, and the treatment effect is improved.
The biogas collected in the gas collection chamber of the anaerobic reactor sequentially passes through the desulfurization fillers in the two desulfurization towers for desulfurization, then the moisture in the biogas is removed through the condensing cylinder, and finally the biogas enters the biogas storage cabinet, so that the biogas generated in the anaerobic reactor can be collected and utilized, and the effective utilization of energy is realized.
The wastewater obtained in examples 1 to 10 was anaerobically pretreated by the above pretreatment system, and the pretreatment results are shown in Table 1 (examples 1 to 5 were desizing wastewater discharged on different dates, and examples 6 to 10 were alkali-reduced wastewater discharged on different dates).
Table 1: the pretreatment results of desizing wastewater and alkali reduction wastewater.
As can be seen from Table 1, microbubbles of CO were subjected to high pressure2After the treatment of the absorption tower, the pH of the wastewater and the alkali reduction wastewater can be reduced from more than 13 to less than 9.5, and the pH of the effluent can be reduced to less than or equal to 9.0 after the treatment of a subsequent anaerobic reactor; after anaerobic treatment, desizing waste waterThe COD value of the anaerobic effluent can be reduced to be below 7500mg/L, and the COD value of the anaerobic effluent of the alkali-minimization wastewater can be reduced to be below 5000mg/L, which both meet the requirements of subsequent comprehensive treatment and can effectively reduce the load of the subsequent comprehensive treatment.
Claims (8)
1. The high-alkalinity high-concentration printing and dyeing wastewater anaerobic pretreatment system is characterized by comprising a high-concentration wastewater adjusting tank (1) and high-pressure micro-bubble CO sequentially connected2An absorption tower (2) and an anaerobic reactor (3), the high-pressure microbubble CO2Absorption tower and CO2Storage system connection, said CO2The storage system comprises liquid CO connected in sequence2Storage tank (4), CO2A vaporizer (5) and a gas pressure regulating device (6), a high concentration wastewater regulating tank and high pressure microbubble CO2A first water diversion tank (7) and a first lift pump (8) which are connected are arranged between the absorption towers, the first water diversion tank is connected with the water outlet end of the high-concentration wastewater adjusting tank, and the first lift pump is connected with the high-pressure microbubble CO2Absorption tower connected, the high pressure microbubble CO2A second water diversion tank (9) and a second lift pump (10) which are connected are arranged between the absorption tower and the anaerobic reactor, and the second water diversion tank and the high-pressure microbubble CO are connected2The absorption tower is connected, and the second lift pump is connected with the anaerobic reactor.
2. The anaerobic pretreatment system for the high-alkalinity high-concentration printing and dyeing wastewater as claimed in claim 1, wherein a grid well (101) is arranged at the water inlet end of the high-concentration wastewater adjusting tank, a mechanical grid (102) is arranged in the grid well, and a first pH measuring device (103) and a liquid level control device (104) are arranged in the high-concentration wastewater adjusting tank.
3. The high alkalinity high concentration printing and dyeing wastewater anaerobic pretreatment system of claim 1, wherein the high pressure microbubble CO is used for pre-treating the printing and dyeing wastewater2A second pH measuring device (201) and microporous CO positioned at the bottom of the absorption tower are arranged in the absorption tower2A releaser (202), a packing (203) positioned in the middle of the absorption tower and a high-pressure spray device positioned at the top of the absorption tower(204) Said microporous CO2The releaser is connected with the gas pressure regulating device, and the high-pressure spraying device is connected with the first lifting pump.
4. The anaerobic pretreatment system for high-alkalinity high-concentration printing and dyeing wastewater according to claim 1 or 2, wherein the CO is introduced into the wastewater2Storage system and high-pressure microbubble CO2A buffer tank (11) is arranged between the absorption towers, the air inlet end of the buffer tank is connected with a gas pressure regulating device, and the air outlet end of the buffer tank is connected with the micropore CO2The releaser is connected.
5. The anaerobic pretreatment system for high-alkalinity high-concentration printing and dyeing wastewater according to claim 1, characterized in that a perforated water distribution system (301) at the bottom of the reactor, a three-phase separator (302) at the top of the reactor and an annular water collection device (303) between the perforated water distribution system and the three-phase separator are arranged in the anaerobic reactor, the perforated water distribution system is connected with a second lift pump, an anaerobic circulating pump (12) is arranged outside the anaerobic reactor, one end of the anaerobic circulating pump is communicated with the second lift pump through a pipeline, and the other end of the anaerobic circulating pump is connected with the annular water collection device.
6. The anaerobic pretreatment system for high-alkalinity high-concentration dyeing wastewater according to claim 5, characterized in that the three-phase separator comprises a plurality of groups of gas separation plates (3021) positioned below, a gas collection chamber (3022) positioned above and a gas riser (3023) connecting the gas separation plates and the gas collection chamber, a settling zone (3024) positioned between the gas separation plates and the gas collection chamber is arranged in the anaerobic reactor, the settling zone is provided with a water outlet weir (3025), each group of gas separation plates comprises two reflecting plates arranged in an inverted V shape, and the upper ends of the reflecting plates are connected with the gas riser.
7. The anaerobic pretreatment system of high alkalinity high concentration printing and dyeing wastewater according to claim 5, characterized in that a sludge discharge pump (13) is arranged outside the anaerobic reactor, and the sludge discharge pump is connected with the bottom of the anaerobic reactor.
8. The anaerobic pretreatment system of high alkalinity high concentration printing and dyeing wastewater according to claim 1 or 5, characterized in that the anaerobic pretreatment system further comprises a biogas collection and storage system, the biogas collection and storage system comprises a first biogas desulfurization tower (14), a second biogas desulfurization tower (15), a condenser tank (16) and a biogas storage cabinet (17) which are connected in sequence, the first biogas desulfurization tower is connected with the anaerobic reactor, and desulfurization fillers (1401) are arranged in the first and second biogas desulfurization towers.
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| CN201921567796.3U CN210855707U (en) | 2019-09-19 | 2019-09-19 | High basicity high concentration printing and dyeing wastewater anaerobic pretreatment system |
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| CN201921567796.3U CN210855707U (en) | 2019-09-19 | 2019-09-19 | High basicity high concentration printing and dyeing wastewater anaerobic pretreatment system |
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