CN117776392B - Mixed multistage AO processing system for treating semi-coke wastewater - Google Patents
Mixed multistage AO processing system for treating semi-coke wastewater Download PDFInfo
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- CN117776392B CN117776392B CN202410199506.3A CN202410199506A CN117776392B CN 117776392 B CN117776392 B CN 117776392B CN 202410199506 A CN202410199506 A CN 202410199506A CN 117776392 B CN117776392 B CN 117776392B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 78
- 239000000571 coke Substances 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 96
- 238000004062 sedimentation Methods 0.000 claims abstract description 71
- 238000005192 partition Methods 0.000 claims abstract description 42
- 238000007872 degassing Methods 0.000 claims description 46
- 239000010865 sewage Substances 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 description 15
- 239000010802 sludge Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000007034 nitrosation reaction Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a mixed multistage AO treatment system for treating semi-coke wastewater, which comprises an anaerobic zone, and an aerobic zone, an anoxic zone and a sedimentation zone which are positioned on the side surface of the anaerobic zone, wherein the aerobic zone comprises an upstream aerobic zone, a midstream aerobic zone and a downstream aerobic zone which are sequentially connected, and the axial direction of the anaerobic zone is perpendicular to the axial directions of the upstream aerobic zone, the anoxic zone, the sedimentation zone and the downstream aerobic zone and is parallel to the axial direction of the midstream aerobic zone; the anaerobic zone and the midstream aerobic zone are respectively positioned at two axial ends of the sedimentation zone; the longitudinal section of the anoxic zone and the longitudinal section of the aerobic zone form a rectangle, and the anoxic zone and the aerobic zone are separated by a first inclined side surface; the anaerobic zone is divided into a plurality of anaerobic zones along the axial direction of the anaerobic zone, and a water outlet of the anaerobic zone is connected with a water inlet of a first anaerobic zone at the upstream side of the anaerobic zone; the upstream aerobic section is divided into a plurality of aerobic partitions along the axial direction of the upstream aerobic section, and wastewater treated by the anoxic partition overflows into the corresponding aerobic partitions from the top of the first inclined side surface.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a mixed multistage AO (anaerobic-anoxic) treatment system for treating semi-coke wastewater.
Background
The semi-coke wastewater is industrial wastewater containing more organic pollutants, is wastewater with higher treatment difficulty in the coal chemical industry, and has higher yield. At present, the main method for treating semi-coke wastewater is to firstly separate oil from water and recycle valuable components in the semi-coke wastewater, and the rest wastewater mainly contains a large amount of water-soluble organic pollutants, and for the part of wastewater, chemical advanced oxidation and biochemical treatment methods are generally adopted. The advanced oxidation method needs to use an oxidant, and has higher cost for treating large-batch wastewater. For semi-coke wastewater containing a large amount of organic pollutants, the treatment efficiency of the common biochemical treatment process and device needs to be improved.
Disclosure of Invention
In order to solve the problems, the invention provides a mixed multistage AO treatment system for treating semi-coke wastewater, which comprises an anaerobic zone, and an aerobic zone, an anoxic zone and a sedimentation zone which are positioned on the side surface of the anaerobic zone, wherein the aerobic zone comprises an upstream aerobic section, a midstream aerobic section and a downstream aerobic section which are sequentially connected, the axial direction of the anaerobic zone is perpendicular to the axial directions of the upstream aerobic section, the anoxic zone, the sedimentation zone and the downstream aerobic section, and the axial direction of the anaerobic zone is parallel to the axial direction of the midstream aerobic section; the anaerobic zone and the midstream aerobic zone are respectively positioned at two axial ends of the sedimentation zone;
The longitudinal section of the anoxic zone and the longitudinal section of the aerobic zone form a rectangle, the anoxic zone and the aerobic zone are separated by a first inclined side surface, and the first inclined side surface inclines towards the inside of the anoxic zone, so that the anoxic zone forms a structure with a small lower part and a big upper part;
The anaerobic zone is divided into a plurality of anaerobic zones along the axial direction of the anaerobic zone, a water outlet of the anaerobic zone is connected with a water inlet of a first anaerobic zone at the upstream side of the anaerobic zone, and the water inlet is arranged at the lower part of the first inclined side surface; the upstream aerobic section is divided into a plurality of aerobic partitions along the axial direction of the upstream aerobic section, and wastewater treated by the anoxic partition can overflow into the corresponding aerobic partitions from the top of the first inclined side surface.
Optionally, the anaerobic zone is rectangular, and an aerobic zone, an anoxic zone and a sedimentation zone are arranged outside one long side surface of the anaerobic zone;
a plurality of vertical guide plates are uniformly arranged in the anaerobic zone along the axial direction of the anaerobic zone (namely the length direction of the anaerobic zone), the anaerobic zone is uniformly divided into a plurality of anaerobic zones, a water inlet is arranged on one wide side surface of the anaerobic zone, the water inlet is used for inputting semi-coke wastewater, and a water outlet on the other wide side surface is connected with a water inlet of a first anoxic zone on the upstream side of the anoxic zone.
Optionally, the longitudinal section of the anoxic zone is a right triangle, one vertical right-angle side is close to the side surface of the sedimentation zone, the other horizontal right-angle side is the top edge of the anoxic zone, and one side is the first inclined side surface;
The flow direction of the water flow in each anoxic zone is opposite to the overall flow direction of the upstream aerobic section, namely the downstream side of the anoxic zone is closer to the upstream end of the upstream aerobic section, and the upstream side of the anoxic zone is closer to the downstream end of the upstream aerobic section; an overflow port is arranged at the top of the first inclined side surface and close to the downstream side of the anoxic zone, and overflows the wastewater treated by the anoxic zone to a corresponding aerobic zone beside; a water inlet is arranged at the lower part of the first inclined side surface and near the upstream side of the anoxic zone.
The structure of the first aerobic zone on the upstream side of the upstream aerobic section is different from that of other aerobic zones, and the structures of other aerobic zones are as follows. Optionally, a degassing guide plate is arranged below the overflow port, and the width of the degassing guide plate is larger than that of the overflow port and is used for receiving wastewater overflowed from the overflow port and guiding the wastewater to a corresponding aerobic zone beside;
The top of the degassing guide plate is hinged to the outer side face of the first inclined side face, the degassing guide plate is inclined and is inclined towards the opposite direction of the inclination of the first inclined side face, and the bottom of the degassing guide plate is far away from the first inclined side face, so that the degassing guide plate and the first inclined side face form a herringbone shape.
Optionally, the bottom surface of the aerobic zone is provided with a water inlet component, the water inlet component comprises a water distribution pipe and upflow walls at two sides of the water distribution pipe, the water distribution pipe is horizontal, the top surface is uniformly provided with a plurality of water outlets, one end of the water distribution pipe is positioned at the bottom in the adjacent aerobic zone at the upstream side, the water distribution pipe penetrates through the partition walls or the partition walls of the two adjacent aerobic zones, the other end of the water distribution pipe is closed, and wastewater after the treatment of the aerobic zone at the upstream side is input into the bottom of the aerobic zone at the downstream side;
The upflow walls are vertical, a gap is formed between the top of one upflow wall and the lower surface of the first inclined side surface, and a gap is formed between the top of the other upflow wall and the lower surface of the degassing guide plate.
Optionally, a sewage interception barrier is arranged between the up-flow wall close to the first inclined side surface and the first inclined side surface, the sewage interception barrier is parallel to the up-flow wall, and the bottom and the top of the sewage interception barrier are respectively fixed on the bottom surface of the aerobic zone and the outer side surface of the first inclined side surface;
the bottom surface of the aerobic zone is provided with a water pump, the water pump is positioned in the area between the sewage interception blocking net and the first inclined side surface, the water outlet end of the water pump is connected with the water inlet, and filtered wastewater is input into the upstream side of the lower part of the anoxic zone.
Further alternatively, the side surface of the aerobic partition adjacent to the upstream side is an upstream side surface, the side surface opposite to the upstream side surface is a downstream side surface, the length of the upflow wall is 1/3-1/2 of the distance between the upstream side surface and the downstream side surface, and the length of the water distribution pipe is not more than the length of the upflow wall;
The width of the degassing guide plate is larger than the width of the overflow port and is not smaller than the length of the upflow wall.
Further optionally, the sewage interception barrier divides the aerobic division area below the first inclined side face into two parts, the part close to the upflow wall is a mud-containing area, the other part is a mud-removing area, two sides of the sewage interception barrier are respectively fixed on the upstream side face and the downstream side face, the sewage interception barrier filters out mud from the sewage containing the mud area, clear water enters the mud-removing area, and the water pump is positioned in the mud-removing area and is used for inputting the clear water into the anoxic division area.
Optionally, a mixing stirrer is arranged at the bottom of the degassing guide plate, and two sides of the bottom of the degassing guide plate extend out of one section respectively to form a mounting plate for mounting the mixing stirrer;
The mixing stirrer comprises a main shaft and a plurality of stirring paddles, the stirring paddles are uniformly distributed along the length direction and the circumferential direction of the main shaft, the main shaft is parallel to the water distribution pipe, two ends of the main shaft are respectively and rotatably connected with the mounting plates, and a driving motor is arranged on the outer side of any one of the mounting plates and used for driving the main shaft to rotate.
Optionally, the sedimentation area is divided into a plurality of sedimentation areas with the same structure along the axial direction of the sedimentation area, wastewater conveyed from the downstream aerobic section sequentially passes through the plurality of sedimentation areas to be subjected to multiple sedimentation separation, and water production is obtained in the last sedimentation area;
The sedimentation zone comprises an upper separation zone and a middle-lower sedimentation zone, the separation zone is square, and the longitudinal section of the sedimentation zone is triangular, so that the sedimentation zone is small and large at the bottom; the top of the outer side surface of the separation zone facing the downstream aerobic section is provided with an auxiliary overflow port, and the bottom of one side of the sedimentation zone facing the downstream aerobic section is provided with an auxiliary water inlet.
Drawings
FIG. 1 is a schematic diagram of the structure (top view) of the hybrid multi-stage AO treatment system for treating semi-coke wastewater;
FIG. 2 is a schematic side view of an anaerobic zone;
FIG. 3 is a schematic longitudinal section of an aerobic zone and an anoxic zone;
FIG. 4 is a schematic longitudinal section of a sedimentation zone.
In the attached drawings, a 1-anaerobic zone, a 2-aerobic zone, a 3-anoxic zone, a 4-sedimentation zone, a 5-upstream aerobic zone, a 6-midstream aerobic zone, a 7-downstream aerobic zone, a 8-first inclined side surface, a 9-second inclined side surface, a 10-anoxic zone, a 11-water inlet, a 12-aerobic zone, a 13-singular plate, a 14-double plate, a 15-water receiving tank, a 16-auxiliary water inlet, a 17-degassing guide plate, a 18-water distribution pipe, a 19-lifting wall, a 20-sewage interception blocking net, a 21-water pump, a 22-mud-containing zone, a 23-mud removal zone, a 24-mixing stirrer, a 25-main shaft, a 26-water guide pipe and a 27-sedimentation zone.
Detailed Description
The embodiment provides a mixed multistage AO treatment system for treating semi-coke wastewater, as shown in fig. 1-4, the mixed multistage AO treatment system comprises an anaerobic zone 1, an aerobic zone 2, an anoxic zone 3 and a sedimentation zone 4 which are positioned on the side surface of the anaerobic zone 1, wherein the aerobic zone 2 comprises an upstream aerobic section 5, a midstream aerobic section 6 and a downstream aerobic section 7 which are sequentially connected, the axial direction of the anaerobic zone 1 is perpendicular to the axial directions of the upstream aerobic section 5, the anoxic zone 3, the sedimentation zone 4 and the downstream aerobic section 7, and the axial direction of the anaerobic zone 1 is parallel to the axial direction of the midstream aerobic section 6; the anaerobic zone 1 and the midstream aerobic section 6 are respectively positioned at two axial ends of the sedimentation zone 4;
The longitudinal section of the anoxic zone 3 and the longitudinal section of the aerobic zone 2 form a rectangle, the anoxic zone 3 and the aerobic zone 2 are separated by a first inclined side surface 8, and the first inclined side surface 8 inclines towards the inside of the anoxic zone 3, so that the anoxic zone 3 forms a structure with a small lower part and a big upper part;
The anoxic zone 3 is divided into a plurality of anoxic zones 10 along the axial direction of the anoxic zone 3, a water outlet of the anaerobic zone 1 is connected with a water inlet 11 of a first anoxic zone 10 on the upstream side of the anoxic zone 3, and the water inlet 11 is arranged at the lower part of the first inclined side surface 8; the upstream aerobic section 5 is divided into a plurality of aerobic partitions 12 along the axial direction of the upstream aerobic section, and waste water treated by the anoxic partition 10 can overflow into the corresponding aerobic partitions 12 from the top of the first inclined side surface 8.
Optionally, the anaerobic zone 1 is rectangular, and an aerobic zone 2, an anoxic zone 3 and a sedimentation zone 4 are arranged outside one long side surface of the anaerobic zone;
the anaerobic zone 1 is internally and uniformly provided with a plurality of vertical guide plates along the axial direction of the anaerobic zone 1 (namely the length direction of the anaerobic zone), the anaerobic zone 1 is uniformly divided into a plurality of anaerobic zones, one wide side surface of the anaerobic zone 1 is provided with a water inlet for inputting semi-coke wastewater, and a water outlet of the other wide side surface is connected with a water inlet 11 of a first anoxic zone 10 on the upstream side of the anoxic zone 3, so that wastewater in the anaerobic zone 1 flows along the guide plates in an up-down baffling way in the anaerobic zone 1, and finally is input into the first anoxic zone 10 on the upstream side of the anoxic zone 3.
Further alternatively, the single-order flow guide plate in the anaerobic zone 1 is a single-number plate 13, and the double-number flow guide plate is a double-number plate 14;
the top of the singular plate 13 is higher than the liquid level of the anaerobic partition at two sides of the singular plate 13, a gap is reserved between the bottom of the singular plate 13 and the bottom surface of the anaerobic partition 1, and wastewater in the anaerobic partition at the upstream side is allowed to flow into the adjacent anaerobic partition from the gap;
The bottom of the double plate 14 is fixed on the bottom surface of the anaerobic zone 1, and the top of the double plate 14 is lower than the tops of the adjacent single plates 13 on both sides and higher than the liquid level of the anaerobic zone on the downstream side of the double plate 14, allowing wastewater from the anaerobic zone on the upstream side to overflow from the top of the double plate 14 into the adjacent anaerobic zone on the downstream side.
Anaerobic microorganisms are arranged in the anaerobic zone 1 in a baffling flow mode, so that the anaerobic microorganisms can be effectively intercepted, anaerobic sludge in each anaerobic zone is in a suspension state, and pollutants in the semi-coke wastewater can be fully contacted with the anaerobic microorganisms, and the biochemical treatment efficiency is improved.
Further optionally, the position of the upstream side of the anaerobic zone 1 corresponds to the downstream end of the downstream aerobic section 7, the position of the downstream side of the anaerobic zone 1 corresponds to the upstream end of the upstream aerobic section 5, and the downstream end of the upstream aerobic section 5 is connected with the upstream end of the downstream aerobic section 7 through the midstream aerobic section 6;
the upstream end of the upstream aerobic section 5 corresponds to the upstream end of the anoxic zone 3 and the upstream end of the sedimentation zone 4, the downstream end of the upstream aerobic section 5 corresponds to the downstream end of the anoxic zone 3 and the downstream end of the sedimentation zone 4, the upstream ends of the anoxic zone 3 and the sedimentation zone 4 are close to the anaerobic zone 1, and the downstream ends of the anoxic zone 3 and the sedimentation zone 4 are close to the midstream aerobic section 6. The upstream aerobic section 5, the anoxic zone 3, the sedimentation zone 4 and the downstream aerobic section 7 are arranged side by side in sequence along the axial direction of the anaerobic zone 1, except that a part of the upstream aerobic section 5 is arranged below the anoxic zone 3.
Optionally, the longitudinal section of the anoxic zone 10 is a right triangle, wherein one vertical right-angle side is close to the side surface of the sedimentation zone 4, the other horizontal right-angle side is the top edge of the anoxic zone 10, and one side is the first inclined side surface 8;
the flow direction of the water flow in each anoxic zone 10 is opposite to the overall flow direction of the upstream aerobic section 5, namely, the downstream side of the anoxic zone 10 is closer to the upstream end of the upstream aerobic section 5, and the upstream side of the anoxic zone 10 is closer to the downstream end of the upstream aerobic section 5; an overflow port is arranged at the top of the first inclined side surface 8 and close to the downstream side of the anoxic zone 10, and overflows the wastewater treated by the anoxic zone 10 to the corresponding aerobic zone 12 beside; a water inlet 11 is provided at a position near the upstream side of the anoxic zone 10 in the lower part of the first inclined side surface 8.
The anoxic zone 3 is internally provided with anoxic microorganisms, the wastewater treated in the anaerobic zone 1 is input into the water inlet 11 of the first anoxic zone 10 at the upstream side of the anoxic zone 3, flows from bottom to top, flows from the downstream side of the anoxic zone 10 to the upstream side and fully contacts with anoxic sludge, and as the section of the anoxic zone 10 is small and large, the flow speed of water flow can be gradually slowed down, thereby being beneficial to the sedimentation of anoxic sludge, and then is flushed up by the water inflow at the lower side again, so that the anoxic sludge is prevented from entering the aerobic zone 12.
The longitudinal sections of the aerobic partition 12 and the anoxic partition 10 corresponding to the positions form a rectangle, the anoxic partition 10 is positioned at the left upper corner or the right upper corner of the rectangle, and the height of the aerobic partition 12 is larger than that of the anoxic partition 10, namely, a part of the aerobic partition 12 is arranged below the anoxic partition 10.
The structure of the first aerobic zone 12 on the upstream side of the upstream aerobic section 5 is different from the structure of the other aerobic zones 12, and the structure of the other aerobic zones 12 is as follows. Optionally, a degassing guide plate 17 is arranged below the overflow port, and the width of the degassing guide plate 17 is larger than that of the overflow port, so as to receive the wastewater overflowed from the overflow port and guide the wastewater to the corresponding aerobic zone 12 beside;
The top of the degassing guide plate 17 is hinged to the outer side face of the first inclined side face 8, the degassing guide plate 17 is inclined and is inclined towards the opposite direction of the inclination of the first inclined side face 8, and the bottom of the degassing guide plate 17 is far away from the first inclined side face 8, so that the degassing guide plate 17 and the first inclined side face 8 form a herringbone shape.
Optionally, the bottom surface of the aerobic zone 12 is provided with a water inlet component, the water inlet component comprises a water distribution pipe 18 and upflow walls 19 at two sides of the water distribution pipe 18, the water distribution pipe 18 is horizontal, the top surface is uniformly provided with a plurality of water outlets, one end of the water distribution pipe 18 is positioned at the bottom in the adjacent aerobic zone 12 at the upstream side, the water distribution pipe 18 penetrates through the partition walls or the partition walls of the two adjacent aerobic zones 12, the other end of the water distribution pipe 18 is closed, and the wastewater treated by the aerobic zone 12 at the upstream side is input into the bottom of the aerobic zone 12 at the downstream side;
the upflow walls 19 are vertical, with a gap between the top of one upflow wall 19 and the lower surface of the first inclined side 8, and a gap between the top of the other upflow wall 19 and the lower surface of the degassing baffle 17.
Optionally, a sewage interception barrier 20 is arranged between the up-flow wall 19 close to the first inclined side surface 8 and the first inclined side surface 8, the sewage interception barrier 20 is parallel to the up-flow wall 19, and the bottom and the top of the sewage interception barrier 20 are respectively fixed on the bottom surface of the aerobic zone 12 and the outer side surface of the first inclined side surface 8;
The bottom surface of the aerobic zone 12 is provided with a water pump 21, the water pump 21 is positioned in the area between the sewage interception barrier 20 and the first inclined side surface 8, the water outlet end of the water pump 21 is connected with the water inlet 11, and filtered wastewater is input into the upstream side of the lower part of the anoxic zone 10.
Further alternatively, the side of the aerobic zone 12 adjacent to the upstream side is an upstream side, the side opposite to the upstream side is a downstream side, the length of the upflow wall 19 is 1/3-1/2 of the distance between the upstream side and the downstream side, and the length of the water distribution pipe 18 is not greater than the length of the upflow wall 19;
The width of the degassing guide plate 17 is larger than the width of the overflow port and is not smaller than the length of the upflow wall 19.
Further alternatively, the sewage interception barrier 20 divides the aerobic zone 12 below the first inclined side surface 8 into two parts, the part close to the upflow wall 19 is a mud-containing zone 22, the other part is a mud-removing zone 23, two sides of the sewage interception barrier 20 are respectively fixed on the upstream side surface and the downstream side surface, the sewage interception barrier 20 filters the sewage containing the mud-containing zone 22, the clean water enters the mud-removing zone 23, the water pump 21 is positioned in the mud-removing zone 23 and is used for inputting the clean water into the anoxic zone 10.
Further optionally, the portion of the sewage interception barrier 20 corresponding to the upflow wall 19 has a radian protruding toward the mud removing area 23, and the water inlet end of the water pump 21 is connected to the position with the largest radian of the sewage interception barrier 20 through a pipeline; the other portions of the dirt stop 20 are straight.
Except for the first aerobic partition 12 on the upstream side of the upstream aerobic section 5, the other aerobic partitions 12 are all waste water treated by introducing the upstream adjacent aerobic partitions 12 through the water inlet assembly, the waste water is input into a region between two upflow walls 19 through a water distribution pipe 18, then most of the waste water flows upwards to a herringbone degassing component formed by a degassing guide plate 17 and a first inclined side surface 8 for degassing (removing oxygen), the degassed waste water flows to a mud-containing region 22 from a gap between the first inclined side surface 8 and the corresponding upflow wall 19 below, and then is filtered by a sewage interception blocking net 20, clear water with less mud enters a mud-removing region 23, and then the clear water is input into a water inlet 11 of the corresponding anoxic partition 10 beside by a water pump 21. According to the invention, through the water inlet assembly, wastewater treated by the upstream side aerobic partition 12 is input into the downstream side anoxic partition 10, meanwhile, the herringbone degassing component is utilized to firstly degas, and then the sewage interception blocking net 20 is utilized to intercept aerobic sludge, so that the oxygen content and the aerobic sludge of the wastewater entering the anoxic partition 10 are reduced, the wastewater from the aerobic partition 12 is adapted to the environment of the anoxic partition 10 as soon as possible, and the treatment effect is improved.
After the wastewater is treated in the anoxic zone 10, overflows from the overflow port, and flows into the corresponding aerobic zone 12 beside through the upper surface of the degassing guide plate 17, the bottom of the degassing guide plate 17 is positioned below the liquid level of the aerobic zone 12, and the amount of the degassing guide plate 17 extending below the liquid level of the aerobic zone 12 depends on the actual amount of the wastewater and the treatment condition. After the wastewater output from the water distribution pipe 18 is degassed by the herringbone degassing component, part of the wastewater flows into the aerobic zone 12 from a gap between the degassing guide plate 17 and the corresponding upflow wall 19 below, and the part of the wastewater has low oxygen content and a certain amount of aerobic sludge, and is mixed with the wastewater treated by the anoxic zone 10 flowing down along the upper surface of the degassing guide plate 17 to be used as the total inflow water of the aerobic zone 12.
Optionally, a mixing stirrer 24 is arranged at the bottom of the degassing guide plate 17, and two sides of the bottom of the degassing guide plate 17 extend out of one section respectively to form a mounting plate for mounting the mixing stirrer 24;
the mixing stirrer 24 comprises a main shaft 25 and a plurality of stirring paddles, the stirring paddles are uniformly distributed along the length direction and the circumferential direction of the main shaft 25, the main shaft 25 is parallel to the water distribution pipe 18, two ends of the main shaft 25 are respectively and rotatably connected with the mounting plates, and a driving motor is arranged on the outer side of any one of the mounting plates and used for driving the main shaft 25 to rotate.
Since the wastewater flowing above and below the degassing guide plate 17 is wastewater from the anoxic zone 10 and the upstream aerobic zone 12 respectively, the oxygen content is low, the water quality is different, the types of the contained sludge are different, and the mixing stirrer 24 at the bottom of the degassing guide plate 17 can uniformly mix the two types of wastewater to form the inflow water of the downstream aerobic zone 12.
The first aerobic zone 12 on the upstream side of the upstream aerobic section 5 has a degassing baffle 17 therein, but the water inlet assembly and the mixing agitator 24 are not provided, and the only source of water inlet for this aerobic zone 12 is the overflow water outlet of the corresponding anoxic zone 10 beside. The bottom of all the aerobic zones 12 is provided with aeration pipes, stirring devices are arranged if necessary, and aerobic sludge is provided. Nitrifying liquid of the downstream aerobic section flows back to the first anoxic zone on the upstream side of the anoxic zone.
Optionally, the water outlet of the last aerobic zone 12 at the downstream side of the upstream aerobic section 5 is connected with the water inlet of the midstream aerobic section 6, the midstream aerobic section 6 is internally provided with an aeration pipe, a stirring device and aerobic sludge, the water outlet of the midstream aerobic section 6 is connected with the water inlet of the downstream aerobic section 7, and wastewater is continuously subjected to biochemical treatment in the midstream aerobic section 6 and the downstream aerobic section 7, so that COD of the wastewater is further reduced.
Optionally, the sedimentation zone 4 is divided into a plurality of sedimentation zones 27 with the same structure along the axial direction of the sedimentation zone, the wastewater conveyed by the downstream aerobic section 7 sequentially passes through the plurality of sedimentation zones 27 to be subjected to multiple sedimentation separation, and the produced water is obtained in the last sedimentation zone 27;
the sedimentation zone 27 comprises an upper separation zone and a middle-lower sedimentation zone, wherein the separation zone is square, and the longitudinal section of the sedimentation zone is triangular, so that the sedimentation zone is small at the bottom and large at the top; the top of the outer side surface of the separation zone facing the downstream aerobic section 7 is provided with an auxiliary overflow port, and the bottom of one side of the sedimentation zone facing the downstream aerobic section 7 is provided with an auxiliary water inlet 16.
Further optionally, a water receiving tank 15 is arranged below the auxiliary overflow port, the water receiving tank 15 is connected with the auxiliary water inlet 16 of the sedimentation zone 27 adjacent to the downstream side through a water guide pipe 26, and the supernatant separated by the sedimentation zone 27 overflows from the auxiliary overflow port to the water receiving tank 15 and is input into the sedimentation zone of the downstream sedimentation zone 27 through the water guide pipe 26;
the secondary overflow of the last sedimentation zone 27 on the downstream side is connected to a water production pipe for directly outputting produced water.
As a specific embodiment, the longitudinal section of the sedimentation zone is a right triangle, wherein one horizontal right-angle side is positioned between the separation zone and the sedimentation zone, the other vertical right-angle side is close to the side surface of the aerobic zone 12, and one side is the second inclined side surface 9, so that the longitudinal section of the sedimentation zone is gradually widened from bottom to top. The water entering each sedimentation partition 27 enters from the bottom and then flows from bottom to top, the flow speed of the water flow is gradually slowed down as the area of the sedimentation partition 27 is gradually increased from bottom to top, the sludge is settled, the water passes through the settled sludge layer upwards, and the supernatant overflows.
Further alternatively, the bottom of each sedimentation zone is connected with a sludge discharge pipe, the sludge discharge pipe is connected with the aerobic zone 2 and the anoxic zone 3, and the sludge precipitated in the sedimentation zone 4 is returned to the aerobic zone 2 and the anoxic zone 3.
The waste water treated by the anaerobic zone is input into the first anoxic zone, treated and then input into the first aerobic zone, the waste water treated by the first aerobic zone is input into the water inlet component of the second aerobic zone, part of the waste water is subjected to degassing and desliming and then is input into the second anoxic zone, and the other part of the waste water is subjected to degassing and then is mixed with the waste water treated by the second anoxic zone to be used as the total water inlet of the second aerobic zone. That is, the second and subsequent aerobic zones are all mixed with the incoming water. The second aerobic zone and the subsequent aerobic zones can generate NO 2 -N through nitrosation reaction, the NO 2 -N can be used as a hydrogen acceptor for denitrification after wastewater is input into the anoxic zone, and the NO 2 -N and NH 4 + in the anoxic zone are subjected to reaction denitrification; the wastewater from the previous aerobic zone can also be subjected to nitration reaction in the next aerobic zone, so that NH 4 + can be reacted into NO 3 -,NO3 -, and the NO 3 -,NO3 - can also enter the next anoxic zone for denitrification. NO 2 - produced by denitrification of NO 3 - in the anoxic zone can be continuously nitrified to generate NO 3 - after entering the aerobic zone. The mixed water inflow of the aerobic zone and the anoxic zone water inflow of the invention can be used for homogenizing water quality and promoting respective biochemical treatment of the aerobic zone and the anoxic zone.
Claims (8)
1. The mixed multistage AO treatment system for treating semi-coke wastewater is characterized by comprising an anaerobic zone, and an aerobic zone, an anoxic zone and a sedimentation zone which are positioned on the side surface of the anaerobic zone, wherein the aerobic zone comprises an upstream aerobic section, a middle-stream aerobic section and a downstream aerobic section which are sequentially connected, the axial direction of the anaerobic zone is perpendicular to the axial directions of the upstream aerobic section, the anoxic zone, the sedimentation zone and the downstream aerobic section, and the axial direction of the anaerobic zone is parallel to the axial direction of the middle-stream aerobic section; the anaerobic zone and the midstream aerobic zone are respectively positioned at two axial ends of the sedimentation zone;
The longitudinal section of the anoxic zone and the longitudinal section of the aerobic zone form a rectangle, the anoxic zone and the aerobic zone are separated by a first inclined side surface, and the first inclined side surface inclines towards the inside of the anoxic zone, so that the anoxic zone forms a structure with a small lower part and a big upper part;
the anaerobic zone is divided into a plurality of anaerobic zones along the axial direction of the anaerobic zone, a water outlet of the anaerobic zone is connected with a water inlet of a first anaerobic zone at the upstream side of the anaerobic zone, and the water inlet is arranged at the lower part of the first inclined side surface; the upstream aerobic section is divided into a plurality of aerobic partitions along the axial direction of the upstream aerobic section, and wastewater treated by the anoxic partition can overflow into the corresponding aerobic partitions from the top of the first inclined side surface;
The flow direction of water flow in each anoxic zone is opposite to the overall flow direction of the upstream aerobic section, the downstream side of the anoxic zone is closer to the upstream end of the upstream aerobic section, and the upstream side of the anoxic zone is closer to the downstream end of the upstream aerobic section; an overflow port is arranged at the top of the first inclined side surface and close to the downstream side of the anoxic zone, and overflows the wastewater treated by the anoxic zone to a corresponding aerobic zone beside; a water inlet is arranged at the lower part of the first inclined side surface and near the upstream side of the anoxic zone;
a degassing guide plate is arranged below the overflow port, and the width of the degassing guide plate is larger than that of the overflow port and is used for receiving wastewater overflowed from the overflow port and guiding the wastewater to a corresponding aerobic zone beside;
The top of the degassing guide plate is hinged to the outer side face of the first inclined side face, the degassing guide plate is inclined and is inclined towards the opposite direction of the inclination of the first inclined side face, and the bottom of the degassing guide plate is far away from the first inclined side face, so that the degassing guide plate and the first inclined side face form a herringbone;
The bottom surface of the aerobic zone is provided with a water inlet component, the water inlet component comprises a water distribution pipe and upflow walls at two sides of the water distribution pipe, and wastewater after being treated by the upstream side aerobic zone is input into the bottom of the downstream side aerobic zone; a gap is formed between the top of one upflow wall and the lower surface of the first inclined side surface, and a gap is formed between the top of the other upflow wall and the lower surface of the degassing guide plate;
a sewage interception blocking net is arranged between the upward flow wall close to the first inclined side surface and the first inclined side surface, the sewage interception blocking net is parallel to the upward flow wall, and the bottom and the top of the sewage interception blocking net are respectively fixed on the bottom surface of the aerobic partition and the outer side surface of the first inclined side surface;
The bottom surface of the aerobic zone is provided with a water pump, the water pump is positioned in the area between the sewage interception blocking net and the first inclined side surface, the water outlet end of the water pump is connected with the water inlet, and filtered wastewater is input into the anoxic zone.
2. The mixed multistage AO-treatment system for treating semi-coke wastewater according to claim 1, wherein the anaerobic zone is rectangular, and an aerobic zone, an anoxic zone and a sedimentation zone are arranged outside one long side surface of the anaerobic zone;
a plurality of vertical guide plates are uniformly arranged in the anaerobic zone along the axial direction of the anaerobic zone and used for uniformly dividing the anaerobic zone into a plurality of anaerobic zones, a water inlet is formed in one wide side face of the anaerobic zone and used for inputting semi-coke wastewater, and a water outlet in the other wide side face is connected with a water inlet of a first anoxic zone on the upstream side of the anoxic zone.
3. The mixed multistage AO processing system for treating semi-coke wastewater according to claim 1 wherein the longitudinal section of the anoxic zone is a right triangle with one vertical right angle side adjacent to the side of the settling zone and the other horizontal right angle side being the top side of the anoxic zone and one side being the first sloped side.
4. The mixed multistage AO processing system for treating semi-coke wastewater according to claim 1, wherein the water distribution pipe is horizontal, a plurality of water outlets are uniformly formed in the top surface, one end of the water distribution pipe is positioned at the bottom in the adjacent aerobic subareas at the upstream side, the water distribution pipe penetrates through the partition walls or the partition walls of the two adjacent aerobic subareas, and the other end of the water distribution pipe is closed;
the upflow wall is vertical.
5. The mixed multistage AO processing system for treating semi-coke wastewater according to claim 4, wherein a side of the aerobic zone adjacent to the upstream side is an upstream side, a side opposite to the upstream side is a downstream side, a length of the upflow wall is 1/3-1/2 of a distance between the upstream side and the downstream side, and a length of the water distribution pipe is not greater than a length of the upflow wall;
The width of the degassing guide plate is larger than the width of the overflow port and is not smaller than the length of the upflow wall.
6. The system of claim 5, wherein the intercepting screen divides the aerobic zone below the first inclined side into two parts, the part near the upflow wall is a mud-containing zone, the other part is a mud-removing zone, two sides of the intercepting screen are respectively fixed on the upstream side and the downstream side, the intercepting screen filters the waste water of the mud-containing zone, clean water enters the mud-removing zone, and a water pump is positioned in the mud-removing zone for inputting the clean water into the anoxic zone.
7. The mixed multistage AO processing system for treating semi-coke wastewater according to claim 1, wherein a mixing stirrer is arranged at the bottom of the degassing guide plate, and two sides of the bottom of the degassing guide plate extend out of one section respectively to form a mounting plate for mounting the mixing stirrer;
The mixing stirrer comprises a main shaft and a plurality of stirring paddles, the stirring paddles are uniformly distributed along the length direction and the circumferential direction of the main shaft, the main shaft is parallel to the water distribution pipe, two ends of the main shaft are respectively and rotatably connected with the mounting plates, and a driving motor is arranged on the outer side of any one of the mounting plates and used for driving the main shaft to rotate.
8. The mixed multistage AO-treatment system for treating semi-coke wastewater according to claim 1, wherein the sedimentation zone is divided into a plurality of sedimentation zones with the same structure along the axial direction of the sedimentation zone, wastewater conveyed from the downstream aerobic section sequentially passes through the plurality of sedimentation zones to be subjected to multiple sedimentation separation, and produced water is obtained in the last sedimentation zone;
The sedimentation zone comprises an upper separation zone and a middle-lower sedimentation zone, the separation zone is square, and the longitudinal section of the sedimentation zone is triangular, so that the sedimentation zone is small and large at the bottom; the top of the outer side surface of the separation zone facing the downstream aerobic section is provided with an auxiliary overflow port, and the bottom of one side of the sedimentation zone facing the downstream aerobic section is provided with an auxiliary water inlet.
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