CN1376642A - Equipment and process for treating sewage by integrated oxidizing ditch with 3D circulation - Google Patents
Equipment and process for treating sewage by integrated oxidizing ditch with 3D circulation Download PDFInfo
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- CN1376642A CN1376642A CN 01109727 CN01109727A CN1376642A CN 1376642 A CN1376642 A CN 1376642A CN 01109727 CN01109727 CN 01109727 CN 01109727 A CN01109727 A CN 01109727A CN 1376642 A CN1376642 A CN 1376642A
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- oxidation ditch
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- separate device
- liquid precipitate
- mixed solution
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Abstract
An equipment for treating sewage with steric circulation type integral oxidizing channel is disclosed. Said oxidizing channel is divided into upper aerobic region and low anaerobic region by partition, the upper side wall has water inlet, overflow dam and water outlet and the rotary aerating brush is installed in the front. The solid-liquid separator installed to the side has an inclined inlet of mixed liquid. A mud reflux port is made at lower position.
Description
The invention belongs to the equipment that utilizes biochemical technology to dispose of sewage, particularly a kind of stereoscopic circulation integrated oxidation ditch sewage disposal device and working method thereof.
Known a kind of oxidation ditch sewage disposal technology is the twentieth century exploitation fifties at present, mainly is made up of oxidation ditch, second pond and mud return-flow system, and it is a kind of form of activated sludge treatment method.The device that utilizes the oxidation ditch treatment technology at first is Paasche Wei Er (Pasveer) oxidation ditch device, see accompanying drawing 4, after this develop various multi-form oxidation ditch devices again, as Caro plug (Carrousel) oxidation ditch device, see accompanying drawing 5, and opel (Orbal) oxidation ditch device etc., see accompanying drawing 6.
The common feature of these oxidation ditch devices is: oxidation ditch is the plane enclosed irrigation canals and ditches that circulate, and uses a kind of aeration and agitator with direction control to promote mixed solution (sewage and active sludge are formed) along continuous straight runs and circulate continuously in the closed type channel; The residence time of sewage and microorganism is long, and the load of organic pollutant is low; Oxidation ditch can stably reach effective removal of organism and total suspended solid by the operation and maintenance of low limit.Settling tank and oxidation ditch branch are built, and by sludge pump precipitating sludge are back in the oxidation ditch.Its main drawback is that the depth of water is 1-3 rice usually because the ability of aerator is limit, and the degree of depth of oxidation ditch is more shallow, and floor space is big.Therefore, be restricted in land resources country use in short supply.
Later 1980s, the U.S. has developed another kind of known oxidation ditch sewage treatment-----integrated oxidation ditch (Integral oxidation Ditch is called for short I.O.D), sees accompanying drawing 7.It is that a kind of sewage aeration with conventional oxidation ditch device purifies and the precipitation of mixed solution/separates merge into a single whole (settling tank is set directly in the oxidation ditch raceway groove), flows with the no blowback of realization mud.The used method of this method and conventional oxidation ditch device is compared, and has saved the mud return-flow system.Its shortcoming is: second pond is built in the recirculation channel, has increased flow resistance, to the requirement raising of aerator.The operation adjusting function is poor.Because still circulation continuously in horizontal direction of mixed solution is subjected to the restriction of aeration ability in the reaction tank, the depth of water generally is no more than 3 meters, therefore, still has the excessive problem of floor space.
The object of the present invention is to provide on a kind of fluidised form mode completely newly, more save floor occupying area, further save the stereoscopic circulation integrated oxidation ditch sewage disposal device and the working method thereof of energy consumption.
Equipment of the present invention is made up of oxidation ditch and solid-liquid precipitate and separate device, it is characterized in that:
Described oxidation ditch is the tridimensional circulation type oxidation ditch, and it is by dividing plate oxidation ditch to be divided into two portions up and down, and top is aerobic zone, and the bottom is the oxygen-starved area; On a sidewall on tridimensional circulating oxidation ditch top, have water-in, aeration rotary brush is installed in the place ahead of water-in;
Described solid-liquid precipitate and separate device is a rectangular vessel, and its bottom mixed solution admission port is diagonal cut joint, is provided with overflow weir and water outlet on the sidewall on top, on another sidewall, and is positioned at place, tridimensional circulating oxidation ditch bottom and has the mud refluxing opening;
Solid-liquid precipitate and separate device is mounted on the sidewall of tridimensional circulating oxidation ditch, and the water outlet of solid-liquid precipitate and separate device is on the top of tridimensional circulating oxidation ditch, and the mud refluxing opening is in the lower section of tridimensional circulating oxidation ditch.
Described solid-liquid precipitate and separate device is installed on the sidewall of tridimensional circulating oxidation ditch, is meant the sidewall that has the water-in opposite on the wall.
Described dividing plate is mounted between the inner side-wall of solid-liquid precipitate and separate device and tridimensional circulating oxidation ditch, and the two ends of dividing plate respectively and leave between the inner side-wall of the sidewall of tridimensional circulating oxidation ditch and solid-liquid precipitate and separate device and make the unimpeded round-robin raceway groove of water; Or dividing plate respectively with airtight connection of inner side-wall of sidewall with the solid-liquid precipitate and separate device of tridimensional circulating oxidation ditch, have at the dividing plate two ends and to make the unimpeded round-robin of water hole.
The mud refluxing opening of described solid-liquid precipitate and separate device is provided in a side of on the sidewall on overflow weir and water outlet opposite.
Further above the mud refluxing opening, have on the described solid-liquid precipitate and separate device flatly, and connect a pipe core for partially mixed liquid inflow at the mouth place.
Solid-liquid precipitate and separate device of the present invention is a rectangular vessel, suitably highly locate to have the mud refluxing opening being positioned at the tridimensional circulating oxidation ditch bottom, the hydrodynamic characteristic that when dirty, produces by mixed solution in the oxidation ditch, make mud be back in the oxidation ditch automatically, mud reflux type uniqueness, mud-water separation is effective, realizes the non-power consumption that mud refluxes.It is as follows that the different modes that solid-liquid separator enters according to mixed solution can be divided into two kinds of structures: structure one, mixed solution import are positioned at three-dimensional oxidation ditch bottom, and mixed solution only enters separator from here; Structure two keeps under the prerequisite of structure one, has above the mud refluxing opening flatly, and connects the pipe core of certain size at the mouth place, flows into for partially mixed liquid.
Stereoscopic circulation integrated oxidation ditch sewage disposal working method of the present invention is: city domestic sewage or some trade effluent at first enter the stereoscopic circulation integrated oxidation ditch top that microbial population (active sludge) is housed by water-in, make sewage and the microbial population thorough mixing that is stirred by the aeration rotary brush device, in this district, mixed solution has been oxygen condition, effectively degradation of organic substances and ammonia nitrogen is oxidized to nitric nitrogen (nitrate nitrogen and nitrite nitrogen); Then, the bottom that raceway groove or the hole of mixed solution by side flows into stereoscopic circulation integrated oxidation ditch downwards, in this district, mixed solution is anoxic condition, under the effect of denitrifying bacteria is nitrogen and removing from water with nitrate-nitrogen reduction; Denitrification is a carbon source with the organism, as COD, therefore can simultaneously partial organic substances be removed.
Partially mixed liquid enters the solid-liquid precipitate and separate device from the mixed solution admission port of solid-liquid precipitate and separate device bottom; Or, when activated sludge concentration in the tridimensional circulating oxidation ditch is big, allow part enter mixed solution the solid-liquid precipitate and separate device from the pipe core of solid-liquid precipitate and separate device, with entering mixed solution the solid-liquid precipitate and separate device from solid-liquid precipitate and separate device bottom admission port, carry out solid-liquid separation through the settling region (zone between mixed solution admission port and the mud refluxing opening).
Mixed solution is discharged by water outlet through overflow weir with the supernatant liquor of water inlet equivalent after solid-liquid separation, and mud is back in the stereoscopic circulation integrated oxidation ditch by the mud refluxing opening then by hydromechanical effect.Mixed solution upwards flows into the top of stereoscopic circulation integrated oxidation ditch again by the raceway groove of another side in the process that kinetic energy and potential energy are changed mutually, be solid like this between the upper and lower of stereoscopic circulation integrated oxidation ditch and circulate.So move in circles, sewage is purified.
Equipment of the present invention and working method thereof have following advantage:
1. the system architecture compactness is constructed succinctly, and operation is very simple with maintenance, and manual request is few, easily is automated control.
2. mixed solution circulates up and down in the tridimensional circulation type oxidation ditch, thereby can effectively improve the oxidation ditch depth of water, compares floor space with existing oxidation ditch and can reduce about 50%.
3. the tridimensional circulation type oxidation ditch can be finished organic removal and biological denitrificaion synchronously.On top, mixed solution has been an oxygen condition, effectively degradation of organic substances and ammonia nitrogen is oxidized to nitric nitrogen (nitrate nitrogen and nitrite nitrogen).Being anoxic condition at bottom, under the effect of denitrifying bacteria is nitrogen and removing from water with nitrate-nitrogen reduction.Denitrification is carbon source with the organism, therefore can simultaneously partial organic substances be removed.Because bottom of this tridimensional circulating oxidation ditch and air are isolated, there is not the air reoxygenation phenomenon of existing oxidation ditch anoxic section, help forming anoxic condition, denitrification efficient height.Compare with existing oxidation ditch, useful volume can reduce about 30%.
4. solid-liquid precipitate and separate device is installed in an end of ditch among the present invention, and the mixed solution of ditch internal recycle is flowed without any influence.The mud refluxing opening suitably highly is being set, mud is being back in the oxidation ditch automatically by the hydrodynamic characteristic that when flowing, produces under the mixed solution in the oxidation ditch, mud reflux type uniqueness, mud-water separation is effective, realizes the non-power consumption that mud refluxes.
Below in conjunction with embodiment and accompanying drawing technical scheme of the present invention is further described.
Fig. 1. the synoptic diagram of present device.
Fig. 2. the present invention is not with the solid-liquid precipitate and separate device synoptic diagram of pipe core;
A. floor map; B. schematic perspective view.
Fig. 3. the solid-liquid precipitate and separate device synoptic diagram of band pipe core of the present invention;
A. floor map; B. schematic perspective view.
Fig. 4. Paasche Wei Er (Pasveer) ditch synoptic diagram.
Fig. 5. Caro plug (Carrousel) oxidation ditch synoptic diagram.
Fig. 6. opel (Orbal) oxidation ditch synoptic diagram.
Fig. 7. existing integrated oxidation ditch (Integral oxidation Ditch is called for short I.O.D) synoptic diagram.
Indicate among the figure:
1. water-in 2. aeration rotary brushs 3. horizontal planes 4. overflow weirs 5. water outlets
6. solid-liquid precipitate and separate device 7. mud refluxing openings 8. mixed solution admission ports
9. dividing plate 10. raceway grooves 11. pipe cores 12. second ponds 13. partition walls
14. header 15. suspended sludge layers
Embodiment 1:
One stereoscopic circulation integrated oxidation ditch is divided into up and down two portions by dividing plate with oxidation ditch, and both sides leave raceway groove, and top is aerobic zone, and the bottom is the oxygen-starved area; On a sidewall on tridimensional circulating oxidation ditch top, have water-in, the aeration rotary brush of driven by motor is installed in the place ahead of water-in; By a swash plate mixed solution admission port of solid-liquid precipitate and separate device is blocked into the opening of inclination, sidewall at an upper portion thereof is provided with overflow weir and water outlet, on another sidewall, and is positioned at place, tridimensional circulating oxidation ditch bottom and has the mud refluxing opening.
To contain COD is 200～900mg/l, ammonia nitrogen is 65mg/l, SS is that the sewage of 130～500mg/l is pumped into by water-in the tridimensional circulation type oxidation ditch of taking from municipal sewage plant's returned sluge is housed, in the whole service process, keeping the interior activated sludge concentration of stereoscopic circulation integrated oxidation ditch is 2000～6000mg/l, water temperature is 5～30 ℃, and pH is 6～9.
Make sewage and microbial population (active sludge) thorough mixing that is stirred by the aeration rotary brush device, in this district, mixed solution has been oxygen condition, organism is degraded effectively, nitration reaction takes place and is converted into nitric nitrogen in ammonia nitrogen in the raceway groove of top, change into nitrogen and from water, overflow at the bottom nitric nitrogen, finished biological denitrification process.Partially mixed liquid enters the solid-liquid precipitate and separate device from the mixed solution admission port of solid-liquid precipitate and separate device bottom; Mixed solution carries out solid-liquid separation through the mixed solution admission port of solid-liquid precipitate and separate device and the settling region between the mud refluxing opening;
Mixed solution is discharged by water outlet through overflow weir with the supernatant liquor of water inlet equivalent after solid-liquid separation, and mud is back in the stereoscopic circulation integrated oxidation ditch by the mud refluxing opening then by hydromechanical effect.Mixed solution upwards flows into the top of stereoscopic circulation integrated oxidation ditch again by the raceway groove of another side in the process that kinetic energy and potential energy are changed mutually, be solid like this between the upper and lower of stereoscopic circulation integrated oxidation ditch and circulate.So move in circles, sewage is purified.
COD is 30～90mg/l in the water outlet, and ammonia nitrogen is 0～5mg/l, and SS is 13～50mg/l, has reached national miscellaneous domestic water quality standard.
To contain COD is 800～900mg/l, ammonia nitrogen is 65mg/l, SS is that the sewage of 130～500mg/l is pumped into by water-in the tridimensional circulation type oxidation ditch of taking from municipal sewage plant's returned sluge is housed, in the whole service process, keeping the interior activated sludge concentration of stereoscopic circulation integrated oxidation ditch is 6000～8000mg/l, water temperature is 5～30 ℃, and pH is 6～9.
Adopt the device of the stereoscopic circulation integrated oxidation ditch of embodiment 1, but adopt the solid-liquid precipitate and separate device that has pipe core, allow part enter mixed solution the solid-liquid precipitate and separate device from the pipe core of solid-liquid precipitate and separate device, with entering mixed solution the solid-liquid precipitate and separate device from solid-liquid precipitate and separate device bottom admission port, carry out solid-liquid separation through the settling region (zone between mixed solution admission port and the mud refluxing opening); Obtain good decontamination effect improving equally.
Claims (6)
1. a stereoscopic circulation integrated oxidation ditch equipment is made up of oxidation ditch and solid-liquid precipitate and separate device, it is characterized in that:
Described oxidation ditch is the tridimensional circulation type oxidation ditch, and it is by dividing plate oxidation ditch to be divided into two portions up and down, and top is aerobic zone, and the bottom is the oxygen-starved area; On a sidewall on tridimensional circulating oxidation ditch top, have water-in, aeration rotary brush is installed in the place ahead of water-in;
Described solid-liquid precipitate and separate device is a rectangular vessel, and its bottom mixed solution admission port is diagonal cut joint, is provided with overflow weir and water outlet on the sidewall on top, on another sidewall, and is positioned at place, tridimensional circulating oxidation ditch bottom and has the mud refluxing opening;
Solid-liquid precipitate and separate device is mounted on the sidewall of tridimensional circulating oxidation ditch, and the water outlet of solid-liquid precipitate and separate device is on the top of tridimensional circulating oxidation ditch, and the mud refluxing opening is in the lower section of tridimensional circulating oxidation ditch.
2. stereoscopic circulation integrated oxidation ditch equipment as claimed in claim 1 is characterized in that: described solid-liquid precipitate and separate device is installed on the sidewall of tridimensional circulating oxidation ditch, is meant the sidewall that has the water-in opposite on the wall.
3. stereoscopic circulation integrated oxidation ditch equipment as claimed in claim 1, it is characterized in that: described dividing plate is mounted between the inner side-wall of solid-liquid precipitate and separate device and tridimensional circulating oxidation ditch, and the two ends of dividing plate respectively and leave between the inner side-wall of the sidewall of tridimensional circulating oxidation ditch and solid-liquid precipitate and separate device and make the unimpeded round-robin raceway groove of water; Or dividing plate respectively with airtight connection of inner side-wall of sidewall with the solid-liquid precipitate and separate device of tridimensional circulating oxidation ditch, have at the dividing plate two ends and to make the unimpeded round-robin of water hole.
4. stereoscopic circulation integrated oxidation ditch equipment as claimed in claim 1 is characterized in that: the mud refluxing opening of described solid-liquid precipitate and separate device is provided in a side of on the sidewall on overflow weir and water outlet opposite.
5. stereoscopic circulation integrated oxidation ditch equipment as claimed in claim 1 is characterized in that: further have above the mud refluxing opening on the described solid-liquid precipitate and separate device flatly, and connect a pipe core for partially mixed liquid inflow at opening part.
6. as the working method of the described stereoscopic circulation integrated oxidation ditch equipment of claim 1-5, it is characterized in that: at first sewage is entered the stereoscopic circulation integrated oxidation ditch top that microbial population is housed by water-in, make sewage and the microbial population thorough mixing that is stirred by the aeration rotary brush device, make mixed solution be oxygen condition; Then, the bottom that raceway groove or the hole of mixed solution by side flows into stereoscopic circulation integrated oxidation ditch downwards makes mixed solution be anoxic condition, under the effect of denitrifying bacteria is nitrogen and removing from water with nitrate-nitrogen reduction; Denitrification is carbon source with the organism;
Partially mixed liquid enters the solid-liquid precipitate and separate device from the mixed solution admission port of solid-liquid precipitate and separate device bottom; Or, when activated sludge concentration in the tridimensional circulating oxidation ditch is big, allow part enter mixed solution the solid-liquid precipitate and separate device from the pipe core of solid-liquid precipitate and separate device, with entering mixed solution the solid-liquid precipitate and separate device from solid-liquid precipitate and separate device bottom admission port, carry out solid-liquid separation through the settling region;
Mixed solution is after solid-liquid separation, discharge by water outlet through overflow weir with the supernatant liquor of water inlet equivalent, mud is then by hydromechanical effect, be back in the stereoscopic circulation integrated oxidation ditch by the mud refluxing opening, mixed solution is in the process that kinetic energy and potential energy are changed mutually, upwards flow into the top of stereoscopic circulation integrated oxidation ditch again by the raceway groove of another side, between the upper and lower of stereoscopic circulation integrated oxidation ditch, be solid like this and circulate; So move in circles, sewage is purified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01109727 CN1376642A (en) | 2001-03-27 | 2001-03-27 | Equipment and process for treating sewage by integrated oxidizing ditch with 3D circulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01109727 CN1376642A (en) | 2001-03-27 | 2001-03-27 | Equipment and process for treating sewage by integrated oxidizing ditch with 3D circulation |
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| CN1376642A true CN1376642A (en) | 2002-10-30 |
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| CN 01109727 Pending CN1376642A (en) | 2001-03-27 | 2001-03-27 | Equipment and process for treating sewage by integrated oxidizing ditch with 3D circulation |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292996C (en) * | 2004-05-13 | 2007-01-03 | 中国科学院生态环境研究中心 | Integrative reactor for biologic phosphorus removal and denitrogenation from sewage circulated in 3D |
| CN100337937C (en) * | 2004-06-02 | 2007-09-19 | 韩相培 | Integrated water treatment installation including a sedimentation basin built-in type reactor |
| CN100447100C (en) * | 2006-02-21 | 2008-12-31 | 中国科学院生态环境研究中心 | Biological electrochemical combined system for treating dye waste water and method thereof |
| CN101423288B (en) * | 2007-10-29 | 2010-07-21 | 中国科学院生态环境研究中心 | Lateral precipitation and stereoscopic circulation integrated oxidation ditch equipment and operation method |
| CN102001790A (en) * | 2010-11-19 | 2011-04-06 | 赵若云 | Upflow type oxidation ditch organic waste water treatment method |
| CN102491519A (en) * | 2011-12-26 | 2012-06-13 | 重庆大学 | Water pollution control method for landscape |
| CN101531439B (en) * | 2009-04-27 | 2012-07-11 | 江苏金山环保工程集团有限公司 | Integrative three-bent tridimensional cyclic oxidation ditch |
| CN103588299A (en) * | 2013-10-12 | 2014-02-19 | 沈阳建筑大学 | Integrated short-cut nitrification and denitrification biological nitrogen-removal reactor |
| CN103803701A (en) * | 2013-10-18 | 2014-05-21 | 中国科学院生态环境研究中心 | Unilateral precipitation three-dimensional circulation integrated oxidation ditch equipment and operation method thereof |
| CN104445617A (en) * | 2014-11-14 | 2015-03-25 | 重庆大学 | Composite biological enhanced denitrification oxidation ditch system and process |
| CN104556558A (en) * | 2014-12-04 | 2015-04-29 | 中国科学院生态环境研究中心 | Sewage recycling integrated system and operating method capable of enhancing organic matter and ammonia nitrogen removal |
| CN111634994A (en) * | 2020-06-11 | 2020-09-08 | 武汉轻工大学 | Reactor, system and method for improving biodegradability of refractory organic wastewater |
| CN115196748A (en) * | 2022-07-08 | 2022-10-18 | 贵州楚天两江环境股份有限公司 | Upflow type sewage treatment process and sewage treatment equipment |
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2001
- 2001-03-27 CN CN 01109727 patent/CN1376642A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292996C (en) * | 2004-05-13 | 2007-01-03 | 中国科学院生态环境研究中心 | Integrative reactor for biologic phosphorus removal and denitrogenation from sewage circulated in 3D |
| CN100337937C (en) * | 2004-06-02 | 2007-09-19 | 韩相培 | Integrated water treatment installation including a sedimentation basin built-in type reactor |
| CN100447100C (en) * | 2006-02-21 | 2008-12-31 | 中国科学院生态环境研究中心 | Biological electrochemical combined system for treating dye waste water and method thereof |
| CN101423288B (en) * | 2007-10-29 | 2010-07-21 | 中国科学院生态环境研究中心 | Lateral precipitation and stereoscopic circulation integrated oxidation ditch equipment and operation method |
| CN101531439B (en) * | 2009-04-27 | 2012-07-11 | 江苏金山环保工程集团有限公司 | Integrative three-bent tridimensional cyclic oxidation ditch |
| CN102001790B (en) * | 2010-11-19 | 2014-07-30 | 赵若云 | Upflow type oxidation ditch organic waste water treatment method |
| CN102001790A (en) * | 2010-11-19 | 2011-04-06 | 赵若云 | Upflow type oxidation ditch organic waste water treatment method |
| CN102491519A (en) * | 2011-12-26 | 2012-06-13 | 重庆大学 | Water pollution control method for landscape |
| CN102491519B (en) * | 2011-12-26 | 2013-06-19 | 重庆大学 | Water pollution control method for landscape |
| CN103588299A (en) * | 2013-10-12 | 2014-02-19 | 沈阳建筑大学 | Integrated short-cut nitrification and denitrification biological nitrogen-removal reactor |
| CN103588299B (en) * | 2013-10-12 | 2015-08-12 | 沈阳建筑大学 | A kind of integrated short-cut nitrification and denitrification biological denitrification reactor |
| CN103803701A (en) * | 2013-10-18 | 2014-05-21 | 中国科学院生态环境研究中心 | Unilateral precipitation three-dimensional circulation integrated oxidation ditch equipment and operation method thereof |
| CN103803701B (en) * | 2013-10-18 | 2015-07-29 | 中国科学院生态环境研究中心 | A kind of one-sided precipitation and stereoscopic circulation integrated oxidation ditch equipment and working method |
| CN104445617A (en) * | 2014-11-14 | 2015-03-25 | 重庆大学 | Composite biological enhanced denitrification oxidation ditch system and process |
| CN104445617B (en) * | 2014-11-14 | 2016-06-22 | 重庆大学 | A kind of complex biological strengthened denitrification oxidation ditch system |
| CN104556558A (en) * | 2014-12-04 | 2015-04-29 | 中国科学院生态环境研究中心 | Sewage recycling integrated system and operating method capable of enhancing organic matter and ammonia nitrogen removal |
| CN104556558B (en) * | 2014-12-04 | 2017-03-08 | 中国科学院生态环境研究中心 | Reinforcing organic matter and sewage recycling integrated system and the method for operating of ammonia nitrogen removal |
| CN111634994A (en) * | 2020-06-11 | 2020-09-08 | 武汉轻工大学 | Reactor, system and method for improving biodegradability of refractory organic wastewater |
| CN115196748A (en) * | 2022-07-08 | 2022-10-18 | 贵州楚天两江环境股份有限公司 | Upflow type sewage treatment process and sewage treatment equipment |
| CN115196748B (en) * | 2022-07-08 | 2023-06-23 | 贵州楚天两江环境股份有限公司 | Up-flow sewage treatment process and sewage treatment equipment |
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