CN202594916U - Pentaerythritol producing wastewater treatment device - Google Patents
Pentaerythritol producing wastewater treatment device Download PDFInfo
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- CN202594916U CN202594916U CN 201220073290 CN201220073290U CN202594916U CN 202594916 U CN202594916 U CN 202594916U CN 201220073290 CN201220073290 CN 201220073290 CN 201220073290 U CN201220073290 U CN 201220073290U CN 202594916 U CN202594916 U CN 202594916U
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Abstract
The utility model discloses a pentaerythritol producing wastewater treatment device. A producing wastewater incoming pipe is connected with a grid trough; the grid trough, an oil separating tank and a regulating tank share a wall and are built together; the regulating tank is connected with a combined flotation unit; a PAC (polymeric cluminum chloride) adding system and a PAM (polyacrylamide) adding system A are connected with the combined flotation unit; the combined flotation unit is connected with a sludge removing master pipe and an acid regulating tank; the acid regulating tank, an aeration and microelectrolysis reaction tank, a neutralization and coagulation reaction tank, a settling tank and an intermediate water tank are built together to form an aeration and microelectrolysis reaction system; an acid adding system is connected with the acid regulating tank; an alkali adding system is connected with the neutralization and coagulation reaction tank; the intermediate water tank is connected with an efficient anaerobic reactor; the sludge removing master pipe is connected with a sludge tank; an improved SBR (sequencing batch reactor) water distributing area and an improved SBR main reaction area are built together; and the improved SBR main reaction are is connected with the sludge tank. The pentaerythritol producing wastewater treatment device treats pentaerythritol producing wastewater by a method of combining the combined flotation, the aeration and microelectrolysis, the biochemical treatment and an aeration biological filter tank, so that the quality of the outlet water meets the requirement.
Description
Technical field
The utility model relates to wastewater treatment equipment, particularly a kind of tetramethylolmethane production wastewater treatment device.
Background technology
At present, the treatment unit to the tetramethylolmethane factory effluent mainly is that equalizing tank+hydrolysis acidification pool+SBR is set.Its shortcoming has: the first, contain oils in the tetramethylolmethane factory effluent, former treatment unit is not considered oil removing process, so follow-up biochemical treatment is caused very big influence, and water outlet is difficult to stably reaching standard; The second, the formaldehyde that contains high density in the tetramethylolmethane factory effluent, former treatment unit do not consider to remove formaldehyde technology, and under the influence of high-concentration formaldehyde, the mikrobe of acidication and SBR is difficult to normal existence and decomposing pollutant matter; Three, present treatment unit is not considered the advanced treatment of rear end, and water outlet is difficult to the stable emission standard that reaches.
Summary of the invention
The purpose of the utility model is to provide the high COD concentration in a kind of tetramethylolmethane factory effluent, the treatment unit of high concentration of formaldehyde; Make effluent quality reach discharging standards; Reach reduced investment, floor space is little, stable effluent quality is up to standard, be convenient to management and operation, can realize the purpose of robotization control fully.
The formation of the utility model: a kind of tetramethylolmethane production wastewater treatment device, form by frame trough, mechanical grille, oil trap, equalizing tank, combined air flotation, the little electrolytic system of aeration, high efficiency anaerobic reactor, improvement sbr reactor pond, water collecting basin, BAF, monitoring pond, reuse pool and supporting sour dosing system, alkali dosing system, PAC medicine system, PAM medicine system, sludge sump, sludge press filtration system and gas blower, and be aided with on-line monitoring appearance such as pH, COD, liquidometer and TM; Each system couples together through pipeline in order, and factory effluent comes water pipe to be connected with frame trough, and frame trough, oil trap, equalizing tank wall are altogether built jointly together; Mechanical grille is installed in the frame trough, and equalizing tank links to each other with combined air flotation through the equalizing tank rising pipe, and the PAC medicine system links to each other with combined air flotation through the PAC chemical feed pipe; PAM medicine system A links to each other with combined air flotation through PAM chemical feed pipe A, and combined air flotation links to each other with the spoil disposal house steward through combined air flotation shore pipe, combined air flotation scum pipe, and combined air flotation links to each other with the acid adjustment pond through the combined air flotation rising pipe; Acid adjustment pond, aeration micro-electrolysis reaction pond, in and coagulation reaction tank, settling tank, intermediate pool be the aeration micro electrolytic reaction system of building jointly, sour dosing system links to each other with the acid adjustment pond through sour chemical feed pipe, the alkali dosing system through the alkali chemical feed pipe with in link to each other with coagulation reaction tank; The gas blower I links to each other with the little electrolytic system aeration of aeration house steward, acid adjustment pond aeration tube, aeration micro-electrolysis reaction pond aeration tube, in link to each other with the little electrolytic system aeration of coagulation basin aeration tube and aeration house steward, aeration micro-electrolysis reaction pond shore pipe, sludge from sedimentation tank pipe link to each other with the spoil disposal house steward; Intermediate pool links to each other with high efficiency anaerobic reactor through the little electrolytic system rising pipe of aeration, and the high efficiency anaerobic reactor return line links to each other with high efficiency anaerobic reactor, and the high efficiency anaerobic reactor shore pipe links to each other with the spoil disposal house steward; The spoil disposal house steward links to each other with sludge sump, and the high efficiency anaerobic reactor rising pipe links to each other with improvement SBR water distributing area, improves the SBR water distributing area and improves the SBR main reaction region for building system jointly; Improvement SBR return line links to each other with improvement SBR main reaction region, and the gas blower II links to each other with improvement SBR main reaction region through improving the SBR aeration tube, and improvement SBR main reaction region is passed through to improve the SBR shore pipe and linked to each other with sludge sump; Improving the SBR rising pipe links to each other with water collecting basin; The water collecting basin rising pipe links to each other with BAF, and the gas blower II links to each other with BAF aeration backwash house steward, and BAF aeration tube, BAF gas backwash inlet pipe link to each other with BAF aeration backwash house steward; BAF backwash rising pipe I, BAF backwash rising pipe II link to each other with backwash monitoring house steward; BAF backwash water inlet pipe links to each other with the monitoring pond, and the BAF rising pipe links to each other with the monitoring pond, when water outlet is not up to standard; Link to each other with backwash monitoring house steward through monitoring pond upflow tube; Sewage overflow not up to standard is returned equalizing tank handle, water upflow tube up to standard links to each other with reuse pool, and the dioxide peroxide chemical feed pipe links to each other with chlorine dioxide generator with water upflow tube up to standard; The reuse water pipe links to each other with reuse pool; The sludge sump sludge out pipe links to each other with the sludge press filtration machine, and PAM chemical feed pipe B links to each other with PAM medicine system B with the sludge press filtration machine, and the sludge press filtration machine links to each other with equalizing tank through filtrate pipe; The sludge press filtration machine links to each other with rotary conveyor, and rotary conveyor and mud link to each other between stacking.
The acid adjustment pond, in and be provided with aeration tube, pH on-line monitoring appearance in the coagulation reaction tank; Be provided with swash plate in the settling tank, be provided with aeration tube, pebbles filler, iron carbon filler and pH on-line monitoring appearance in the aeration micro-electrolysis reaction pond, be provided with diving mixer, liquidometer, lift pump, COD on-line monitoring appearance in the equalizing tank; Be provided with paddle agitator, volume pump in the PAC medicine system; Be provided with paddle agitator, volume pump among the PAM medicine system A, be provided with volume pump in the sour dosing system, be provided with volume pump in the alkali dosing system; Be respectively arranged with two phase separator, swash plate, pH meter and TM in the high efficiency anaerobic reactor; Improve in the SBR main reaction region and be provided with aerator, be provided with liquidometer and lift pump in the water collecting basin, be provided with filter, pebbles, ceramics filling in the BAF; Monitoring is provided with COD on-line monitoring appearance in the pond, is provided with diving mixer, mud lift pump, liquidometer in the sludge sump.
Compare with prior art; The advantage of the utility model: the first, through oil trap, combined air flotation and the little electrolytic pre-treatment of aeration, with insoluble organic matter removal, the biodegradability that improves sewage can; Simultaneously can effectively remove formaldehyde, protect the continous-stable operation of follow-up biochemical treatment system; The second, high efficiency anaerobic reactor and improved sbr reactor pond are carried out the gradient degraded to high concentration of COD and are removed the stability of enhanced system and impact resistance as the biochemical treatment of this device; Three, adopt the advanced treatment of BAF as this device, further improve water quality, treatment effect is good; Four, a whole set of treatment unit is easy to carry out robotization control, is convenient to Operation, Administration and Maintenance, and the water outlet after the processing can be discharged by stably reaching standard; Five, this plant investment is economized, and working cost is low, and floor space is little.
Description of drawings
Fig. 1 and Fig. 2 are the utility model structural representations,
Among the figure: 1. frame trough; 2. oil trap; 3. equalizing tank; 4. combined air flotation; 5. acid adjustment pond; 6. aeration micro-electrolysis reaction pond; 7. in and coagulation reaction tank; 8. settling tank; 9. intermediate pool; 10. high efficiency anaerobic reactor 11. improves the SBR water distributing area; 12. improve the SBR main reaction region; 13. water collecting basin; 14. BAF; 15. monitoring pond; 16. reuse pool; 17. sludge sump; 18. sludge press filtration machine; 19. rotary conveyor; Between 20. mud is stacked; 21. mechanical grille; 22.PAC medicine system; 23.PAM medicine system A; 24. sour dosing system; 25. alkali dosing system; 26. gas blower I; 27. gas blower II; 28. chlorine dioxide generator; 29.PAM medicine system B; 30. factory effluent comes water pipe; 31. equalizing tank rising pipe; 32. combined air flotation rising pipe; 33. the little electrolytic system rising pipe of aeration; 34. high efficiency anaerobic reactor rising pipe; 35. PAC chemical feed pipe; 36.PAM chemical feed pipe A; 37. sour chemical feed pipe; 38. alkali chemical feed pipe; 39. the little electrolytic system aeration of aeration house steward; 40. acid adjustment pond aeration tube; 41. aeration micro-electrolysis reaction pond aeration tube; 42. in the coagulation basin aeration tube; 43. combined air flotation shore pipe; 44. combined air flotation scum pipe; 45. aeration micro-electrolysis reaction pond shore pipe; 46. sludge from sedimentation tank pipe; 47. high efficiency anaerobic reactor shore pipe; 48. spoil disposal house steward; 49. high efficiency anaerobic reactor return line; 50. improve the SBR return line; 51. improve the SBR aeration tube; 52. BAF aeration backwash house steward; 53. BAF aeration tube; 54. BAF gas backwash inlet pipe; 55. improve the SBR rising pipe; 56. water collecting basin rising pipe; 57. improve the SBR shore pipe; 58. BAF backwash rising pipe I; 59. BAF backwash rising pipe II; 60. monitoring pond upflow tube; 61. backwash monitoring house steward; 62. BAF backwash water inlet pipe; 63. BAF rising pipe; 64. water upflow tube up to standard; 65. dioxide peroxide chemical feed pipe; 66. reuse water pipe; 67. sludge sump sludge out pipe; 68. filtrate pipe; 69.PAM chemical feed pipe B.
Embodiment
Like Fig. 1, shown in Figure 2; A kind of tetramethylolmethane production wastewater treatment device; Form by frame trough, mechanical grille, oil trap, equalizing tank, combined air flotation, the little electrolytic system of aeration, high efficiency anaerobic reactor, improvement sbr reactor pond, water collecting basin, BAF, monitoring pond, reuse pool and supporting sour dosing system, alkali dosing system, PAC medicine system, PAM medicine system, sludge sump, sludge press filtration system and gas blower; And be aided with on-line monitoring appearance such as pH, COD, liquidometer and TM; Each system couples together through pipeline in order, produces
Waste water comes water pipe 30 to be connected with frame trough 1, and frame trough 1, oil trap 2, equalizing tank 3 wall are altogether built jointly together, and mechanical grille 21 is installed in the frame trough 1; Equalizing tank 3 links to each other with combined air flotation 4 through equalizing tank rising pipe 31, and PAC medicine system 22 links to each other with combined air flotation 4 through PAC chemical feed pipe 35, and PAM medicine system A23 links to each other with combined air flotation 4 through PAM chemical feed pipe A36; Combined air flotation 4 links to each other with spoil disposal house steward 48 through combined air flotation shore pipe 43, combined air flotation scum pipe 44, and combined air flotation 4 links to each other with acid adjustment pond 5 through combined air flotation rising pipe 32, acid adjustment pond 5, aeration micro-electrolysis reaction pond 6, in and coagulation reaction tank 7, settling tank 8, intermediate pool 9 be the aeration micro electrolytic reaction system of building jointly; Acid dosing system 24 links to each other with acid adjustment pond 5 through sour chemical feed pipe 37, alkali dosing system 25 pass through alkali chemical feed pipe 38 with in link to each other with coagulation reaction tank 7, gas blower I 26 links to each other with the little electrolytic system aeration of aeration house steward 39; Acid adjustment pond aeration tube 40, aeration micro-electrolysis reaction pond aeration tube 41, in link to each other with the little electrolytic system aeration of coagulation basin aeration tube 42 and aeration house steward 39, aeration micro-electrolysis reaction pond shore pipe 45, sludge from sedimentation tank pipe 46 link to each other with spoil disposal house steward 48, intermediate pool 9 links to each other with high efficiency anaerobic reactor 10 through the little electrolytic system rising pipe 33 of aeration; High efficiency anaerobic reactor return line 49 links to each other with high efficiency anaerobic reactor 10; High efficiency anaerobic reactor shore pipe 47 links to each other with spoil disposal house steward 48, and spoil disposal house steward 48 links to each other with sludge sump 17, and high efficiency anaerobic reactor rising pipe 34 links to each other with improvement SBR water distributing area 11; Improve SBR water distributing area 11 and improve SBR main reaction region 12 for building system jointly; Improvement SBR return line 50 links to each other with improvement SBR main reaction region 12, and gas blower II 27 links to each other with improvement SBR main reaction region 12 through improving SBR aeration tube 51, and improvement SBR main reaction region 12 is passed through to improve SBR shore pipe 57 and linked to each other with sludge sump 17; Improving SBR rising pipe 55 links to each other with water collecting basin 13; Water collecting basin rising pipe 56 links to each other with BAF 14, and gas blower II 27 links to each other with BAF aeration backwash house steward 52, and BAF aeration tube 53, BAF gas backwash inlet pipe 54 link to each other with BAF aeration backwash house steward 52; BAF backwash rising pipe I 58, BAF backwash rising pipe II 59 link to each other with backwash monitoring house steward 61; BAF backwash water inlet pipe 62 links to each other with monitoring pond 15, and BAF rising pipe 63 links to each other with monitoring pond 15, when water outlet is not up to standard; Link to each other with backwash monitoring house steward 61 through monitoring pond upflow tube 60; Sewage overflow not up to standard is returned equalizing tank 3 handle, water upflow tube 64 up to standard links to each other with reuse pool 16, and dioxide peroxide chemical feed pipe 65 links to each other with chlorine dioxide generator 28 with water upflow tube 64 up to standard; Reuse water pipe 66 links to each other with reuse pool 16; Sludge sump sludge out pipe 67 links to each other with sludge press filtration machine 18, and PAM chemical feed pipe B69 links to each other with PAM medicine system B29 with sludge press filtration machine 18, and sludge press filtration machine 18 links to each other with equalizing tank 3 through filtrate pipe 68; Sludge press filtration machine 18 links to each other with rotary conveyor 19, and 20 linked to each other between rotary conveyor 19 and mud were stacked.
Acid adjustment pond 5, in and be provided with aeration tube, pH on-line monitoring appearance in the coagulation reaction tank 7; Be provided with swash plate in the settling tank 8, be provided with aeration tube, pebbles filler, iron carbon filler and pH on-line monitoring appearance in the aeration micro-electrolysis reaction pond 6, be provided with diving mixer, liquidometer, lift pump, COD on-line monitoring appearance in the equalizing tank 3; Be provided with paddle agitator, volume pump in the PAC medicine system 22; Be provided with paddle agitator, volume pump among the PAM medicine system A23, be provided with volume pump in the sour dosing system 24, be provided with volume pump in the alkali dosing system 25; Be respectively arranged with two phase separator, swash plate, pH meter and TM in the high efficiency anaerobic reactor 10; Improve in the SBR main reaction region 12 and be provided with aerator, be provided with liquidometer and lift pump in the water collecting basin 13, be provided with filter, pebbles, ceramics filling in the BAF 14; Monitoring is provided with COD on-line monitoring appearance in the pond 15, is provided with diving mixer, mud lift pump, liquidometer in the sludge sump 17.
Oil trap, combined air flotation, the little electrolytic system of aeration are the pretreatment systems in this treatment unit; In pretreatment system, make insoluble pollution substance from water, be able to remove through deposition; The biochemical property of sewage can be improved in aeration micro-electrolysis reaction pond; Simultaneously can remove formaldehyde effectively, guarantee the steady running of follow-up biochemical treatment system, reduce the burden and the energy consumption of subsequent disposal.
High efficiency anaerobic reactor and improved sbr reactor pond are the cores of this technology, and most organic pollutant was able to remove in this biochemical treatment stage.High efficiency anaerobic reactor all belongs to the flow lifting type anaerobic reactor, on reaction zone, is provided with the two-stage two phase separator, make active sludge and water, generation be so incensed that in reactor head swash plate is set to separate, guarantee the amount of the living microorganism in the reactor drum.Simultaneously, the water after use is handled dilutes the water inlet of high density and stirs, and improves reaction efficiency and impact resistance.Improved sbr reactor pond comprises leading portion water distributing area and main reaction region two portions, utilizes dish formula jet aerator and gas blower that main reactor is carried out the oxygen supply aeration, further degradable organic pollutant matter.BAF is the advanced treatment part of this device, through the mikrobe in the BAF pollution substance in the water is further decomposed, and further improves effluent quality, makes stable water outlet reach the reuse requirement.
Claims (2)
1. a tetramethylolmethane production wastewater treatment device is made up of frame trough, mechanical grille, oil trap, equalizing tank, combined air flotation, the little electrolytic system of aeration, high efficiency anaerobic reactor, improvement sbr reactor pond, water collecting basin, BAF, monitoring pond, reuse pool and supporting sour dosing system, alkali dosing system, PAC medicine system, PAM medicine system, sludge sump, sludge press filtration system and gas blower, and is aided with pH, COD, liquidometer and TM on-line monitoring appearance; It is characterized in that: factory effluent comes water pipe (30) to be connected with frame trough (1), and frame trough (1), oil trap (2), equalizing tank (3) wall are altogether built jointly together, and mechanical grille (21) is installed in the frame trough (1); Equalizing tank (3) links to each other with combined air flotation (4) through equalizing tank rising pipe (31), and PAC medicine system (22) links to each other with combined air flotation (4) through PAC chemical feed pipe (35), and PAM medicine system A (23) links to each other with combined air flotation (4) through PAM chemical feed pipe A (36); Combined air flotation (4) links to each other with spoil disposal house steward (48) through combined air flotation shore pipe (43), combined air flotation scum pipe (44), and combined air flotation (4) passes through combined air flotation rising pipe (32) and links to each other with acid adjustment pond (5), acid adjustment pond (5), aeration micro-electrolysis reaction pond (6), in and coagulation reaction tank (7), settling tank (8), intermediate pool (9) be the aeration micro electrolytic reaction system of building jointly; Acid dosing system (24) links to each other with acid adjustment pond (5) through sour chemical feed pipe (37), alkali dosing system (25) pass through alkali chemical feed pipe (38) with in link to each other with coagulation reaction tank (7), gas blower I (26) links to each other with the little electrolytic system aeration of aeration house steward (39); Acid adjustment pond aeration tube (40), aeration micro-electrolysis reaction pond aeration tube (41), in link to each other with the little electrolytic system aeration of aeration house steward (39) with coagulation basin aeration tube (42), aeration micro-electrolysis reaction pond shore pipe (45), sludge from sedimentation tank pipe (46) link to each other with spoil disposal house steward (48), intermediate pool (9) links to each other with high efficiency anaerobic reactor (10) through the little electrolytic system rising pipe of aeration (33); High efficiency anaerobic reactor return line (49) links to each other with high efficiency anaerobic reactor (10), and high efficiency anaerobic reactor shore pipe (47) links to each other with spoil disposal house steward (48), and spoil disposal house steward (48) links to each other with sludge sump (17); High efficiency anaerobic reactor rising pipe (34) links to each other with improvement SBR water distributing area (11), improves SBR water distributing area (11) and improves SBR main reaction region (12) for building system jointly, improves SBR return line (50) and links to each other with improvement SBR main reaction region (12); Gas blower II (27) links to each other with improvement SBR main reaction region (12) through improving SBR aeration tube (51); Improve SBR main reaction region (12) and link to each other with sludge sump (17) through improving SBR shore pipe (57), improve SBR rising pipe (55) and link to each other with water collecting basin (13), water collecting basin rising pipe (56) links to each other with BAF (14); Gas blower II (27) links to each other with BAF aeration backwash house steward (52); BAF aeration tube (53), BAF gas backwash inlet pipe (54) link to each other with BAF aeration backwash house steward (52), and BAF backwash rising pipe I (58), BAF backwash rising pipe II (59) link to each other with backwash monitoring house steward (61), and BAF backwash water inlet pipe (62) links to each other with monitoring pond (15); BAF rising pipe (63) links to each other with monitoring pond (15); When water outlet is not up to standard, link to each other with backwash monitoring house steward (61) through monitoring pond upflow tube (60), sewage overflow not up to standard is returned equalizing tank (3) handle again; Water upflow tube up to standard (64) links to each other with reuse pool (16); Dioxide peroxide chemical feed pipe (65) links to each other with chlorine dioxide generator (28) with water upflow tube up to standard (64), and reuse water pipe (66) links to each other with reuse pool (16), and sludge sump sludge out pipe (67) links to each other with sludge press filtration machine (18); PAM chemical feed pipe B (69) links to each other with PAM medicine system B (29) with sludge press filtration machine (18); Sludge press filtration machine (18) links to each other with equalizing tank (3) through filtrate pipe (68), and sludge press filtration machine (18) links to each other with rotary conveyor (19), and (20) link to each other between rotary conveyor (19) and mud stacking.
2. a kind of tetramethylolmethane production wastewater treatment device as claimed in claim 1; It is characterized in that: acid adjustment pond (5), in and be provided with aeration tube, pH on-line monitoring appearance in the coagulation reaction tank (7); Settling tank is provided with swash plate in (8), is provided with aeration tube, pebbles filler, iron carbon filler and pH on-line monitoring appearance in the aeration micro-electrolysis reaction pond (6), is provided with diving mixer, liquidometer, lift pump, COD on-line monitoring appearance in the equalizing tank (3); The PAC medicine system is provided with paddle agitator, volume pump in (22); Be provided with paddle agitator, volume pump among the PAM medicine system A (23), sour dosing system is provided with volume pump in (24), and the alkali dosing system is provided with volume pump in (25); High efficiency anaerobic reactor is respectively arranged with two phase separator, swash plate, pH meter and TM in (10); Improve in the SBR main reaction region (12) and be provided with aerator, water collecting basin is provided with liquidometer and lift pump in (13), and BAF is provided with filter, pebbles, ceramics filling in (14); Be provided with COD on-line monitoring appearance in the monitoring pond (15), be provided with diving mixer, mud lift pump, liquidometer in the sludge sump (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220073290 CN202594916U (en) | 2012-03-01 | 2012-03-01 | Pentaerythritol producing wastewater treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220073290 CN202594916U (en) | 2012-03-01 | 2012-03-01 | Pentaerythritol producing wastewater treatment device |
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| Publication Number | Publication Date |
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| CN202594916U true CN202594916U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220073290 Withdrawn - After Issue CN202594916U (en) | 2012-03-01 | 2012-03-01 | Pentaerythritol producing wastewater treatment device |
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| CN (1) | CN202594916U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557359A (en) * | 2012-03-01 | 2012-07-11 | 贵州绿色环保设备工程有限责任公司 | Device for treating wastewater during production of pentaerythritol |
-
2012
- 2012-03-01 CN CN 201220073290 patent/CN202594916U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557359A (en) * | 2012-03-01 | 2012-07-11 | 贵州绿色环保设备工程有限责任公司 | Device for treating wastewater during production of pentaerythritol |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121212 Effective date of abandoning: 20130626 |
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| RGAV | Abandon patent right to avoid regrant |