CN201309877Y - Coking wastewater treatment recycling device - Google Patents
Coking wastewater treatment recycling device Download PDFInfo
- Publication number
- CN201309877Y CN201309877Y CNU2008202152282U CN200820215228U CN201309877Y CN 201309877 Y CN201309877 Y CN 201309877Y CN U2008202152282 U CNU2008202152282 U CN U2008202152282U CN 200820215228 U CN200820215228 U CN 200820215228U CN 201309877 Y CN201309877 Y CN 201309877Y
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- mbr
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Abstract
The utility model relates to a coking wastewater treatment recycling device, which is characterized by comprising a reinforcing pretreatment portion, a biological and sludge treatment portion and a recycle-water treatment portion. Moreover, an electrochemistry device on the reinforcing pretreatment portion is connected with outputted water of an air floatation and inputted water of biological treatment. Furthermore, an outflow pipe of an MBR outflow pool on the biological and sludge treatment portion is in series connection with an ozone contact tower, an active carbon filter tower and an RO device on the recycle-water treatment portion. The utility model has the advantages that a novel combination structure is generated specific to the coking wastewater. Additionally, conventional oil removing, biochemistry and electrochemistry and film technology are effectively combined, electrochemistry reinforced pretreatment is utilized to improve the biochemical quality of polluted substance difficult to be degraded, an MBR is used to reinforce the biochemistry treatment, the recycling treatment design of ozone-active carbon-RO is reasonable, thereby the problem of complex treatment of the coking wastewater is resolved and the recycling purpose is achieved.
Description
Technical field
The utility model relates to a kind of Treatment of Coking Effluent reclamation set, belong to the technical field of Industrial Wastewater Treatment.
Background technology
The waste water composition that produces in the waste water that coking chemical waste water is mainly formed by the moisture in the coking coal, gas purification process, tar and the crude benzol processing is a kind of phenol, cyanogen, oil, ammonia and a large amount of difficult trade effluent of inorganic and organic high density of containing.
Present domestic Technologies of Coke Plant Wastewater Treatment is mainly biological treatment, both Chang Gui " A-O ", " A-A-O " technology, the part Treatment of Coking Effluent is gone direct quenching to grade III Standard COD＜500mg/L, again atmosphere is arrived in pollution transportation, and most of Treatment of Coking Effluent are to COD150～500mg/L discharging, seriously polluted water surrounding, maturation and popularization along with Dry Quenching Technology, country has banned use of the coking chemical waste water after the processing to carry out quenching, the Treatment of Coking Effluent of keeping under strict control simultaneously reaches-level emission standard, both COD＜100mg/L.Yet the main coking wastewater processing system of domestic actual motion still is " oil removing pre-treatment-acidication-anaerobic-aerobic-catalytic oxidation-precipitation-dosing precipitation-haydite filtration-charcoal absorption ", its biological treatment and filtration treatment do not reach the first discharge standard of COD＜100mg/L, and the absorption life-span of gac is too short, frequent replacing is held economically and be can't stand, does not reach the purpose of first grade discharging and processing reuse at all.
Summary of the invention
The utility model proposes a kind of Treatment of Coking Effluent reclamation set.Purpose is intended to overcome the defective that existing Technologies of Coke Plant Wastewater Treatment effluent quality is difficult to reach emission standard, simultaneously again can the reuse water saving.Provide a kind of brand-new combination process, promptly utilize to have removed heavy oil-air supporting-electrochemical pre-treatment, anaerobism-hold concurrently oxygen-oxygen consumption-biological treatment of MBR and the Treatment for Reuse of ozone-active carbon-RO is handled coking chemical waste water and in addition reuse.
Technical solution of the present utility model: its structure be comprise strengthen preprocessing part, biological and sludge treatment partly, the treating part of reuse water, wherein strengthen the water inlet that electrochemical apparatus in the preprocessing part connects pneumatically supported water outlet and biological treatment; The rising pipe of biological and the sludge treatment MBR outlet sump in is partly connected with ozone contact tower, active carbon filter tower, RO device in the treating part of reuse water.
Coking chemical waste water A enters oil trap through pipeline, utilize oil trap to isolate heavy oil B and transport outward with tank car, the water outlet of oil trap enters equalizing tank, with lift pump coking chemical waste water is risen to airfloat equipment from equalizing tank, with the air supporting medicine system flocculation agent and coagulant aids are added airfloat equipment, utilize air supporting further to remove oils and suspended substance, the scum silica frost C that air supporting produces drains into sludge concentration and dewatering equipment, the water outlet of airfloat equipment enters electrochemical apparatus, utilize electrochemical intensive treatment, current collection air supporting, the electricity flocculation, strong oxidation, reach and decompose recalcitrant substance in the waste water, to improve the effect of subsequent biological treatment, the scum silica frost D that electrochemistry produces also enters sludge concentration and dewatering equipment.In biological and sludge treatment part, electrochemical water outlet enters the anaerobism of biological treatment system successively, double oxygen, oxygen consumption, MBR membrane sepn pond, utilize biochemical medicine system that nutritive salt and alkali are added the bio anaerobic pond, utilize Aeration fan B1 to give the pond oxygen supply of biological oxygen consumption, utilize film district blower fan B2 to give biological MBR membrane sepn pond air feed, the excess sludge F in biological MBR membrane sepn pond enters sludge concentration and dewatering equipment, the mixed-liquor return E in biochemical MBR membrane sepn pond gets back to biological oxygen compatibility pool and further handles, sludge concentration and dewatering equipment is with air supporting scum silica frost C, electrochemistry scum silica frost D, biochemical excess sludge F carries out thickening to be handled, the mud cake G outward transport that produces, filtrate H returns equalizing tank and handles again, and the water outlet of MBR is drawn into the MBR outlet sump by suction pump P2.Treating part at reuse water; utilize ozone lift pump P3 that the biochemical treatment water outlet in the MBR outlet sump is risen to the ozone contact tower; the ozone that utilizes ozonizer to produce decomposes the pollutent of remaining difficult degradation after the biochemical treatment in the ozone contact tower; water outlet enters intermediate pool after further removing pollutent by active carbon filter tower then; the RO protection medicament that water pump P 4 adds the water pressurization of intermediate pool with the RO medicine system in the middle of utilizing again is through the particulate matter of security personnel's strainer elimination greater than 5 μ m; work with protection RO; water outlet adds high pressure through RO high-pressure pump P5 and enters the RO device; utilize the RO film further to remove water pollutant and salt; reached the requirement of reuse; the dense water I of RO goes coal yard to press dirt; the water outlet of RO device enters the reuse water tank, through reuse water pump P6 the reuse water J in the reuse water tank is passed through pipeline loopback user again.
Advantage of the present utility model: (1) has provided a kind of new combination process at coking chemical waste water; (2) traditional oil removing, biochemistry and electrochemistry, membrane technique are effectively made up; (3) utilize electrochemistry to strengthen pre-treatment, improve the biochemical of difficult degradation pollutent; (4) utilize MBR to strengthen biochemical treatment; (5) Treatment for Reuse of ozone-active carbon-RO is reasonable in design; (6) both solve the unmanageable problem of coking chemical waste water, reached the purpose of reuse again.
Description of drawings
Accompanying drawing 1 is the structural representation of Treatment of Coking Effluent reclamation set.
I among the figure is that to strengthen preprocessing part, II be that biological and sludge treatment part, III are that treating part, the A of reuse water represents that coking chemical waste water, B represent that heavy oil, C represent that air supporting scum silica frost, D represent that electrochemistry scum silica frost, E represent that mixed-liquor return, F represent that excess sludge, G represent that dried mud outward transport, H represent that filtrate backflow, K represent that the dense water of RO (removing coal yard), J represent reuse water; P1 represents that lift pump, P2 represent that MBR suction pump, P3 represent that ozone lift pump, P4 represent that middle water pump, P5 represent that RO high-pressure pump, P6 represent to reclaim water pump; B1 represents that Aeration fan, B2 represent film district blower fan; 1 expression oil trap, 2 expression equalizing tanks, 3 expression air supporting medicine systems, 4 expression airfloat equipments, 5 expression electrochemical apparatus, the biological medicine system of 6 expressions, 7 expression bio anaerobic ponds, 7 ' represents biological oxygen compatibility pool; 7 " represent biological oxygen consumption pond, 7 ' " the biological MBR membrane sepn of expression pond; 8 expression MBR outlet sumies; 9 expression sludge concentration and dewatering equipment; 10 expression ozonizers; 11 expression ozone contact towers; 12 expression active carbon filter towers, 13 expression intermediate pool, 14 expression RO medicine systems, 15 expression security personnel strainers, 16 expression RO devices, 17 expression reuse water tanks.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:
Contrast accompanying drawing 1 is characterized in that comprising the treating part of strengthening preprocessing part, biology and sludge treatment part, reuse water, wherein strengthens the water outlet of electrochemical apparatus 5 connection airfloat equipments 4 in the preprocessing part and the water inlet of biological treatment; The rising pipe of biological and the sludge treatment MBR outlet sump 8 in is partly connected with ozone contact tower 11, active carbon filter tower 12, RO device 16 in the treating part of reuse water.
Described reinforcement pre-treatment, its structure is that coking chemical waste water A enters oil trap 1 through pipeline, isolated heavy oil B outward transport, the water outlet of oil trap 1 enters equalizing tank 2, the feed-water end of lift pump P1 connects the outlet of equalizing tank 2, the water side of lift pump P1 rises to coking chemical waste water the feed-water end of air supporting 4, air supporting scum silica frost C drains into sludge concentration and dewatering equipment 9, air supporting medicine system 3 adds airfloat equipment 4 with flocculation agent and coagulant aids, the water outlet of airfloat equipment 4 enters electrochemical apparatus 5, and the electrochemistry scum silica frost D of electrochemical apparatus 5 enters sludge concentration and dewatering equipment 9;
Described biology and sludge treatment, its structure is that the water outlet of electrochemistry 5 enters bio anaerobic pond 7, biochemical medicine system 6 adds bio anaerobic pond 7 with nutritive salt and alkali, the water outlet in bio anaerobic pond 7 enters biological oxygen compatibility pool 7 ', the water outlet of biological oxygen compatibility pool 7 ' enters biological oxygen consumption pond 7 ", Aeration fan B1 is connected to biological oxygen consumption pond 7 ", be its oxygen supply, biological oxygen consumption pond 7 " water outlet enter biological MBR membrane sepn pond 7 ' ", film district blower fan B
2Be connected to biological MBR membrane sepn pond 7 ' "; be its air feed; biological MBR membrane sepn pond 7 ' " excess sludge F enter sludge concentration and dewatering equipment 9, biological MBR membrane sepn pond 7 ' " mixed-liquor return E get back to biological oxygen compatibility pool 7 '; sludge concentration and dewatering equipment 9 is with air supporting scum silica frost C; electrochemistry scum silica frost D; excess sludge F carries out thickening to be handled; the mud cake G outward transport of generation; filtrate H returns equalizing tank 2, the aspiration end of MBR suction pump P2 connects biological MBR membrane sepn pond 7 ' " water outlet; the water outlet of MBR suction pump P2 is to the feed-water end of MBR outlet sump 8, and the entrance end of ozone lift pump P3 is received in the water outlet of MBR outlet sump 8;
The processing of described reuse water, the water outlet of MBR outlet sump 8 rises to the feed-water end of ozone contact tower 11, ozonizer 10 is connected to ozone contact tower 11, the water outlet of ozone contact tower 11 flows to active carbon filter tower 12, the water outlet of active carbon filter tower 12 flows to intermediate pool 13, the feed-water end of middle water pump P 4 connects the outlet of intermediate pool 13, the water side of middle water pump P 4 connects the feed-water end of security personnel's strainer 15, RO medicine system 14 also is connected to the feed-water end of security personnel's strainer 15, the feed-water end of RO high-pressure pump P5 connects the water side of security personnel's strainer 15, the water side of RO high-pressure pump P5 connects the inlet segment of RO device 16, the dense water I of RO goes coal yard to press dirt, the water outlet of RO device 16 is to reuse water tank 17, and the entrance end that reclaims water pump P6 connects the water side of reuse water tank 17, reclaims the water outlet of water pump P6 and can pass through pipeline loopback user for reuse water J.
Embodiment:
So-and-so is coke-oven plant 92.5m
3The reuse of/h Treatment of Coking Effluent
1. the processing water yield:
The coking chemical waste water water yield is 92.5m
3/ h (distilled ammonia wastewater 60m wherein
3/ h, other waste water 32.5m
3/ h), for water saving, adopting the froth breaking water of circulation sewer in the treating processes as biological process, final biochemical treatment ability is 180m
3/ h, the reuse water yield is 135m
3/ h.
2. influent quality:
Coking chemical waste water water quality (except that pH, unit: mg/L)
| Project | COD Cr | NH 3-N | Phenols | Cyanogen | Petroleum-type | SS | pH | TDS |
| Numerical value | ＜3500 | ＜200 | ＜700 | ＜20 | ＜30 | ＜300 | 7～8 | ＜10000 |
(hardness and basicity are with CaCO for circulation sewer water quality
3Meter)
| Project | Electricity is led | Total hardness | Total alkalinity | Chlorion | pH | SiO 2 | COD Mn | Temperature |
| Unit | S/cm | mg/L | mg/L | mg/L | mg/L | mg/L | ℃ | |
| Numerical value | ＜2000 | ＜550 | ＜485 | ＜500 | 7～9 | ＜40 | ＜10 | 25～40 |
3. effluent quality:
(unit: mg/L)
| Project | COD Cr | NH 3-N | Phenols | Cyanogen | Petroleum-type | TDS |
| Numerical value | ＜50 | ＜5 | ＜0.5 | ＜0.5 | ＜1 | ＜300 |
4. system's main design parameters:
● main units:
4 of oil trap: 15m * 4m * 3m; 2 of equalizing tank: 15m * 10m * 7m; 2 of biochemical anaerobic pond: 24m * 10m * 7m; 2 of biochemical oxygen compatibility pool: 24m * 10m * 7m; Biochemical oxygen consumption pond: 30m * 24m * 7m2 seat; 2 of biochemical MBR membrane sepn pond: 8m * 6m * 4.5m; 1 of MBR pond: 8m * 6m * 4.5m; 1 of intermediate pool: 8m * 3m * 4.5m; 1 of reuse pool: 8m * 3m * 4.5m.
● the main body water pump:
Lift pump: Q=130m
3/ h, H=12m, 2 of N=7.5kW (1 usefulness 1 is equipped with); MBR suction pump: Q=72m
3/ h, H=13m, 6 of N=5.5kW (4 usefulness 2 are equipped with); Ozone lift pump: Q=90m
3/ h, H=20m, 3 of N=11kW (2 usefulness 1 are equipped with); Middle water pump: Q=90m
3/ h, H=20m, 3 of N=11kW (2 usefulness 1 are equipped with); RO high-pressure pump: Q=90m
32 of/h, H=280m, N=90kW; Reuse water pump: Q=70m
3/ h, H=32m, 3 of N=11kW (2 usefulness 1 are equipped with).
● blower fan:
Aeration fan: C55-1.7 type, 55m
3/ min, 70kPa, 4 of 90kW (2 usefulness 2 are equipped with); Film district blower fan; C35-1.7 type, 35m
3/ min, 55kPa, 3 of 50kW (2 usefulness 1 are equipped with).
● major equipment:
Airfloat equipment: 50m
32 of/h; Electrochemical apparatus: its structure mainly is included in scraping machine is set on the electrolyzer, by plating iridium, ruthenium titanium plate anode, stainless steel cathode etc., 50m
32 of/h, 185kW; MBR film device: Memstar PVDF material MBR membrane module 640m
2/ cover 20 covers; Sludge concentration and dewatering equipment: comprise mud spiral pump Q=30m
3/ h, H=0.3MPa, 2 of N=2.8kW (1 usefulness 1 is equipped with), sludge concentration and dewatering machine B=1m, Q=6～11m
31 of/h, flushing pump Q=10m
3/ h, H=52m, 2 of N=5.5kW (1 usefulness 1 is equipped with); 2 of ozonizer: 3kg, 45kW (oxygen is made source of the gas): ozone contact tower: 4 of Φ 2800mm * 8000mm; Active carbon filter tower: 4 of Φ 2500mm * 8000mm; Security personnel strainer: DN600mm, 5 μ m, 40 " * 2 in 35 cores; RO device: Q=67.5m
3/ h (wherein 75 of PROC10 RO films, 400PSI 8 " 5 core film pipes 15) 3 covers (2 usefulness 1 fully).
● medicine system:
Air supporting medicine system: comprise PAC dosing pump Q=500L/h, P=0.35MPa, N=0.75kW 2 covers, PAM dosing pump Q=500L/h, P=0.35MPa, N=0.75kW 2 covers; Biochemical medicine system: comprise NaOH volume pump Q=0.2～1.2m
3/ h, P=0.35MPa, 2 of N=1.5kW (1 usefulness 1 is equipped with), K
2HPO
4Volume pump 0.2～1.2m
3/ h, P=0.35MPa, 2 of N=1.5kW (1 usefulness 1 is equipped with); RO medicine system: comprise 1 in 2 on Scale inhibitors volume pump AA976 type (1 usefulness 1 be equipped with), 500L PE medicine-chest, 1 in reductant metering pump AA956 type 2 (1 usefulness 1 is equipped with), 1 in 1000L PE medicine-chests, non-oxidative bactericide volume pump AA956 type 2 (1 usefulness 1 fully), 1000L PE medicine-chest.
● other relevant corollary system:
Heavy oil is sent pump outside: Q=5m
3/ h, H=6m, 2 of N=4kW (1 usefulness 1 is equipped with); Light oil is sent pump outside: Q=10m
3/ h, H=10m, 2 of N=0.75kW (1 usefulness 1 is equipped with); Belt oil removal machine: 4 on GP-12 type; Mixed-liquor return pump: Q=450m
34 of/h, H=0.6m, N=2.5kW; Excess sludge discharge pump: Q=30m
32 of/h, H=10m, N=2.2kW; RO flushing pump: Q=100m
31 of/h, H=35m, N=22kW; RO CIP cleaning equipment: comprise and clean water tank V=3m
31, filter rinsed DN600mm, 5 μ m, 40 " * 1 in 35 cores, RO flushing water pump Q=100m
31 of/h, H=32m, N=18.5kW add each 1 of batch meter each 1, its volume pump of HCl, NaOH, NaClO, citric acid; MBR off-line cleaning equipment: comprise that MBR cleans water tank PE V=3m
3, MBR flushing water pump Q=25m
3/ h, H=24m, 2 of N=3kW (1 usefulness 1 is equipped with); Biochemical oxygen consumption pond aeration head: Sanitaire Φ 9 " rubber microporous membrane aeration head 1740 covers; Biochemical oxygen compatibility pool agitator: 2 of QJB400/980-3 type N=4kW, 2 of QJB620/480-5 type N=4kW.
Claims (6)
1, a kind of device of Treatment of Coking Effluent reuse, it is characterized in that comprising strengthen preprocessing part, biological and sludge treatment partly, the treating part of reuse water, wherein strengthen the water inlet that electrochemical apparatus in the preprocessing part connects pneumatically supported water outlet and biological treatment; The rising pipe of biological and the sludge treatment MBR outlet sump in is partly connected with ozone contact tower, active carbon filter tower, RO device in the treating part of reuse water.
2, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that described reinforcement preprocessing part comprises oil trap, equalizing tank, air supporting medicine system, airfloat equipment, electrochemical apparatus, wherein oil trap and equalizing tank join, equalizing tank joins by lift pump and airfloat equipment, the outlet of the inlet of airfloat equipment and air supporting medicine system is joined, and the outlet of airfloat equipment and the inlet of electrochemical apparatus join.
3, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that described biology and sludge treatment partly comprise biological medicine system, bio anaerobic pond, MBR outlet sump, wherein the water-in in the water outlet of biological medicine system and bio anaerobic pond joins, and the water outlet in bio anaerobic pond joins by the water-in of MBR suction pump and MBR outlet sump by biological oxygen compatibility pool, biological oxygen consumption pond, biological MBR membrane sepn pond successively.
4, the device of a kind of Treatment of Coking Effluent reuse according to claim 3 is characterized in that being connected to Aeration fan, film district blower fan respectively on described biological oxygen consumption pond, the biological MBR membrane sepn pond.
5, the device of a kind of Treatment of Coking Effluent reuse according to claim 1, it is characterized in that ozone contact tower, active carbon filter tower, intermediate pool, the water inlet pipe of security personnel's strainer, RO device, reuse water tank serial connection in the treating part of described reuse water, the inlet pipe of ozonizer and ozone contact tower is joined, and the rising pipe of RO medicine system connects the water inlet pipe of security personnel's strainer.
6, the device of a kind of Treatment of Coking Effluent reuse according to claim 5, it is characterized in that described intermediate pool and security personnel strainer water inlet pipe between the dress in the middle of water pump, dress RO high-pressure pump reinstalls on the rising pipe of reuse water tank and uses water pump between security personnel's strainer and RO device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202152282U CN201309877Y (en) | 2008-12-15 | 2008-12-15 | Coking wastewater treatment recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202152282U CN201309877Y (en) | 2008-12-15 | 2008-12-15 | Coking wastewater treatment recycling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201309877Y true CN201309877Y (en) | 2009-09-16 |
Family
ID=41107129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202152282U Expired - Lifetime CN201309877Y (en) | 2008-12-15 | 2008-12-15 | Coking wastewater treatment recycling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201309877Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774737A (en) * | 2009-12-28 | 2010-07-14 | 北京清大国华环保科技有限公司 | Method and device for treating and recycling tobacco wastewater with double-membrane process |
| CN101786767A (en) * | 2010-03-05 | 2010-07-28 | 中冶焦耐(大连)工程技术有限公司 | Advanced treatment process of coking waste water by combining ozone oxidation method and membrane separation technology |
| CN102249487A (en) * | 2011-06-07 | 2011-11-23 | 北京中盛汇大科技有限公司 | Comprehensive processing device for wastewater and waste liquid |
| CN107226580A (en) * | 2016-08-31 | 2017-10-03 | 无锡市新都环保科技有限公司 | A kind of system and processing method of efficient process oily waste water |
| CN108558125A (en) * | 2018-02-14 | 2018-09-21 | 中国国际贸易中心股份有限公司 | It is suitable for the stain disease processing method and system of public building comprehensive utilization |
| CN109279710A (en) * | 2018-09-28 | 2019-01-29 | 西安恒旭科技股份有限公司 | A kind of pretreatment system and method for semi-coke wastewater |
-
2008
- 2008-12-15 CN CNU2008202152282U patent/CN201309877Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774737A (en) * | 2009-12-28 | 2010-07-14 | 北京清大国华环保科技有限公司 | Method and device for treating and recycling tobacco wastewater with double-membrane process |
| CN101774737B (en) * | 2009-12-28 | 2011-11-23 | 北京清大国华环保科技有限公司 | Method and device for treating and recycling tobacco wastewater with double-membrane process |
| CN101786767A (en) * | 2010-03-05 | 2010-07-28 | 中冶焦耐(大连)工程技术有限公司 | Advanced treatment process of coking waste water by combining ozone oxidation method and membrane separation technology |
| CN102249487A (en) * | 2011-06-07 | 2011-11-23 | 北京中盛汇大科技有限公司 | Comprehensive processing device for wastewater and waste liquid |
| CN107226580A (en) * | 2016-08-31 | 2017-10-03 | 无锡市新都环保科技有限公司 | A kind of system and processing method of efficient process oily waste water |
| CN108558125A (en) * | 2018-02-14 | 2018-09-21 | 中国国际贸易中心股份有限公司 | It is suitable for the stain disease processing method and system of public building comprehensive utilization |
| CN109279710A (en) * | 2018-09-28 | 2019-01-29 | 西安恒旭科技股份有限公司 | A kind of pretreatment system and method for semi-coke wastewater |
| CN109279710B (en) * | 2018-09-28 | 2021-09-14 | 西安恒旭科技股份有限公司 | Pretreatment system and method for semi-coke wastewater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI HENGTONG ADVANCED WATER TREATMENT CO., LT Free format text: FORMER NAME: SHANGHAI ITT HENGTONG ADVANCED WATER TREATMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 200333 Shanghai city Putuo District Tong Pu Lu Lane 1130 No. 8 Patentee after: Hengtong Advanced Water Treatment (Shanghai) Co., Ltd. Address before: 200333 Shanghai city Putuo District Tong Pu Lu Lane 1130 No. 8 Patentee before: Shanghai ITT Hengtong Advanced Water Treatment Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090916 |