CN103723849B - Process and device for recovering Fe(OH)2 and Na2SO4 from ferric oxide stain material wastewater concentration system - Google Patents
Process and device for recovering Fe(OH)2 and Na2SO4 from ferric oxide stain material wastewater concentration system Download PDFInfo
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- CN103723849B CN103723849B CN201310747186.2A CN201310747186A CN103723849B CN 103723849 B CN103723849 B CN 103723849B CN 201310747186 A CN201310747186 A CN 201310747186A CN 103723849 B CN103723849 B CN 103723849B
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Abstract
The invention relates to a wastewater recovery process and device and in particular relates to a process and a device for recovering Fe(OH)2 and Na2SO4 from a ferric oxide stain material wastewater concentration system. The recovery process comprises the following steps: (1) pumping process wastewater into a wastewater equalization pond, uniformly mixing, pumping the wastewater into a primary plate sedimentation tank, adding a sodium hydroxide solution for regulating, and forming a Fe(OH)2 precipitate; (2) conveying the precipitate in the primary plate sedimentation tank into a ferrous sulfate workshop, and entering the supernatant into an intermediate pool; (3) converting ferrous ion in the supernatant into ferric ion through aeration; (4) entering the supernatant in a secondary plate sedimentation tank into a clear water pool, and performing depth-type filtration on the wastewater in the clear water pool through a multi-media filter, an ultrafiltration device, a high-pressure pump and a nanofiltration concentration device sequentially so as to obtain Na2SO4 concentrate; and (5) treating the produced water subjected to nanofiltration through a reverse osmosis system, thereby obtaining purified water for production. According to the process, chemical raw materials in the wastewater can be effectively recovered, and the produced water from a recycling system can be used for production water supply.
Description
Technical field
The present invention relates to a kind of wastewater recycling process and device, particularly relate to ferric oxide coloured material Waste water concentrating system recoveries Fe (OH)
2and Na
2sO
4technique and device thereof.
Background technology
Current, iron oxide pigment enterprise reclaims not thorough to the ferrous sulfate of its waste water, and can produce secondary pollution and waste water, does not also have report to carry out efficient recovery to sodium sulfate wherein simultaneously.
CN201161959Y (2008-12-10) discloses a kind of ammonia nitrogen treating plant of wastewater from iron oxide pigment production, but it relates to the process to ammonia nitrogen.
CN102616997B (2013-10-9) discloses a kind of wastewater from iron oxide pigment production treatment process, comprises the following steps: the pH value recovery iron oxide pigment wherein 1) regulating waste water; 2) utilize organic waste water as organic carbon source; 3) anaerobism-oxygen-aerobic biochemical system process wastewater from iron oxide pigment production of holding concurrently is applied.It is also mainly the removal focusing on ammonia nitrogen in wastewater from iron oxide pigment production, and haves much room for improvement to the ferrous example rate of recovery.
Ammonia-nitrogen content in existing ferric oxide coloured material novel process is low, meets sewage drainage standard, but wherein containing more sodium sulfate, factory effluent directly processes rear discharge, does not carry out efficient recovery to starting material.
Summary of the invention
The object of this invention is to provide and a kind ofly can may be used for ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) of water of productive use by the product water of industrial chemicals, reclaiming system in efficient recovery waste water
2and Na
2sO
4.
Above-mentioned technical purpose of the present invention is achieved by the following technical programs:
Ferric oxide coloured material Waste water concentrating system recoveries Fe (OH)
2and Na
2sO
4technique, it comprises the following steps:
(1) ferric oxide coloured material production-line technique waste water is squeezed into wastewater equalization pond, after mixing, squeeze into elementary inclined-plate clarifying basin by lift pump, add sodium hydroxide solution and regulate, form Fe (OH)
2throw out;
(2) Fe (OH) in elementary inclined-plate clarifying basin
2throw out adopts the mode of Cemented filling to deliver to ferrous sulfate workshop, and supernatant liquor enters intermediate pool;
(3) by aeration effect, the ferrous ion in supernatant liquor is converted to ferric ion, then adds sodium hydroxide solution and form Fe (OH)
3, removed by secondary inclined-plate clarifying basin;
(4) supernatant liquor of secondary inclined-plate clarifying basin enters clean water basin, by former water lift pump, the waste water in clean water basin is obtained Na through more medium filter, ultra-filtration equipment, nanofiltration high-pressure pump, the depth type filtration of nanofiltration concentrating unit more successively
2sO
4concentrated solution;
(5) nanofiltration is produced water further by reverse osmosis system process, obtain production pure water.
Advantage of the present invention is:
1. ferric oxide coloured material production-line technique produces two kinds of waste water, and one is the waste water containing sodium sulfate and ferrous sulfate, and one is the waste water containing sodium sulfate, and contriver attempts, by unified process after two kinds of waste water mixing, obtaining Fe (OH)
2and Na
2sO
4, become the important source material of ferric oxide coloured material;
2. will remain unprecipitated ferrous ion by aeration effect and base extraction to remove, further reuse;
3. carry out depth type filtration through more medium filter, ultra-filtration equipment and nanofiltration system and obtain Na
2sO
4concentrated solution reuse; And ultra-filtration equipment, nanofiltration high-pressure pump and nanofiltration concentrating unit are combined to form concentrated Na
2sO
4system, make apparatus of the present invention high for the rejection of divalence and above ion, low for monovalent ion rejection, after removal divalence foreign ion, efficient recovery has the Na of sodium ion
2sO
4concentrated solution;
4. nanofiltration is produced water and is obtained production pure water further by after reverse osmosis system process, realizes environmental protection demand.
As preferably, have two strands from described nanofiltration concentrating unit liquid out, one is through concentrated Na
2sO
4solution enters intermediate water tank from the first outlet collection, and one is only containing a small amount of Na
2sO
4solution from second outlet discharge process; Described nanofiltration concentrating unit is made up of two-stage nanofiltration, and the import of one-level nanofiltration device is connected with high-pressure pump, Na
2sO
4solution is discharged by the first outlet after concentrated, the permeate of one-level nanofiltration device is then connected with the second intermediate water tank, second intermediate water tank is connected with secondary high-pressure pump, pump into secondary nanofiltration device after the pressurization of secondary high-pressure pump to concentrate, the import that the concentrated solution after secondary nanofiltration device concentrates imports one-level nanofiltration device by the second outlet processes again.
As preferably, described reverse osmosis system comprises the intermediate water tank producing water end (W.E.) with described nanofiltration concentrating unit and be connected, the reverse osmosis high-pressure pump, reverse osmosis unit and the reverse osmosis produced water tank that are connected successively with described intermediate water tank.
As preferably, the working pressure scope of described nanofiltration high-pressure pump and reverse osmosis high-pressure pump is 0.5-16MPa.
Ferric oxide coloured material Waste water concentrating system recoveries Fe (OH)
2and Na
2sO
4device, it comprises the wastewater equalization pond be connected with production-line technique waste water, described wastewater equalization pond is connected with lift pump in turn, reaction tank and elementary inclined-plate clarifying basin, the precipitation outlet of described elementary inclined-plate clarifying basin is connected with sludge thickener, sludge thickener is connected with pressure filter, the supernatant liquor outlet of described elementary inclined-plate clarifying basin is connected with intermediate pool, described intermediate pool is connected with secondary inclined-plate clarifying basin, described secondary inclined-plate clarifying basin is connected with clean water basin in turn, raw water pump, more medium filter, water tank is produced in ultra-filtration equipment and ultrafiltration, described ultrafiltration is produced water tank and is connected with nanofiltration high-pressure pump and nanofiltration concentrating unit, described nanofiltration concentrating unit is connected with the first intermediate water tank, described first intermediate water tank is connected with reverse osmosis system.
Advantage of the present invention is:
1. ferric oxide coloured material production-line technique produces two kinds of waste water, and one is the waste water containing sodium sulfate and ferrous sulfate, and one is the waste water containing sodium sulfate, and contriver attempts, by unified process after two kinds of waste water mixing, can obtaining Fe (OH)
2and Na
2sO
4, become the important source material of ferric oxide coloured material; Carry out depth type filtration through more medium filter, ultra-filtration equipment and nanofiltration system and obtain Na
2sO
4concentrated solution reuse; And ultra-filtration equipment, nanofiltration high-pressure pump and nanofiltration concentrating unit are combined to form concentrated Na
2sO
4system, overcome existing apparatus high for the rejection of divalence and above ion, for the shortcoming that monovalent ion rejection is low;
2. nanofiltration is produced water and is obtained production pure water further by after reverse osmosis system process, realizes environmental protection demand.
As preferably, described pressure filter is plate-and-frame filter press.
As preferably, between described more medium filter and described ultra-filtration equipment, be connected with accurate filter.
As preferably, described ultra-filtration equipment is Full-automatic ultra-filtering device.
As preferably, the outlet that water tank is produced in described ultrafiltration is connected with backwashing pump, and described backwashing pump and described ultra-filtration equipment produce water end (W.E.) and communicate.
As preferably, described reverse osmosis system comprises the reverse osmosis high-pressure pump, reverse osmosis unit and the reverse osmosis produced water tank that are connected successively.
As preferably, described nanofiltration concentrating unit is made up of two-stage nanofiltration, the import of one-level nanofiltration device is connected with described nanofiltration high-pressure pump, solution is discharged by the first outlet after concentrated, the permeate outlet of one-level nanofiltration device is then connected with the second intermediate water tank, described second intermediate water tank is connected with secondary high-pressure pump, pump into secondary nanofiltration device after the pressurization of secondary high-pressure pump to concentrate, the import that the concentrated solution after secondary nanofiltration device concentrates imports one-level nanofiltration device by the second outlet processes again.
In sum, the present invention has following beneficial effect:
1, can industrial chemicals in efficient recovery waste water;
2, the product water of reclaiming system may be used for water of productive use.
Accompanying drawing explanation
Fig. 1 is that the present invention is for the production of the ferric oxide coloured material Waste water concentrating system recoveries device schematic diagram with water;
Fig. 2 is nanofiltration concentrating unit schematic diagram of the present invention;
Fig. 3 is ferric oxide coloured material Waste water concentrating system recoveries system embodiment schema of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of ferric oxide coloured material Waste water concentrating system recoveries device, it comprises the wastewater equalization pond 1 be connected with production-line technique waste water, wastewater equalization pond is connected with lift pump 2 in turn, reaction tank 3 and elementary inclined-plate clarifying basin 4, the precipitation outlet of elementary inclined-plate clarifying basin 4 is connected with sludge thickener 5, sludge thickener 5 is connected with pressure filter 6, the supernatant liquor outlet of elementary inclined-plate clarifying basin 4 is connected with intermediate pool 7, intermediate pool 7 is connected with secondary inclined-plate clarifying basin 8, secondary inclined-plate clarifying basin 8 is connected with clean water basin 9 in turn, raw water pump 10, more medium filter 11, water tank 14 is produced in ultra-filtration equipment 13 and ultrafiltration, ultrafiltration is produced water tank 14 and is connected with nanofiltration high-pressure pump 15 and nanofiltration concentrating unit 16, nanofiltration concentrating unit 16 is connected with the first intermediate water tank 17, first intermediate water tank 17 is connected with reverse osmosis system 18.Pressure filter 6 is plate-and-frame filter press.Accurate filter 12 is connected with between more medium filter 11 and ultra-filtration equipment 13.Ultra-filtration equipment 13 is Full-automatic ultra-filtering device.The outlet that water tank 14 is produced in ultrafiltration is connected with backwashing pump 19, and backwashing pump 19 produces water end (W.E.) with ultra-filtration equipment 13 and communicates.Reverse osmosis system 18 comprises the reverse osmosis high-pressure pump 181, reverse osmosis unit 182 and the reverse osmosis produced water tank 183 that are connected successively.Nanofiltration concentrating unit 16 is made up of two-stage nanofiltration, the import of one-level nanofiltration device 161 is connected with nanofiltration high-pressure pump 15, solution is discharged by the first outlet 1611 after concentrated, the permeate of one-level nanofiltration device 161 exports 1612 and is then connected with the second intermediate water tank 162, second intermediate water tank 162 is connected with secondary high-pressure pump 163, secondary high-pressure pump 163 pumps into secondary nanofiltration device 164 after pressurizeing and concentrates, and the import that the concentrated solution after secondary nanofiltration device 164 is concentrated imports one-level nanofiltration device 161 by the second outlet 1641 processes again.
Concrete treatment process comprises the following steps:
(1) the ferric oxide coloured material production-line technique waste water in table 1 is squeezed into wastewater equalization pond, after mixing, squeeze into elementary inclined-plate clarifying basin by lift pump, add sodium hydroxide solution and regulate, form Fe (OH)
2throw out;
Table 1
(2) Fe (OH) in elementary inclined-plate clarifying basin
2throw out adopts the mode of Cemented filling to deliver to ferrous sulfate workshop, and supernatant liquor enters intermediate pool;
(3) by aeration effect, the ferrous ion in supernatant liquor is converted to ferric ion, then adds sodium hydroxide solution and form Fe (OH)
3, removed by secondary inclined-plate clarifying basin;
(4) supernatant liquor of secondary inclined-plate clarifying basin enters clean water basin, by former water lift pump, the waste water in clean water basin is obtained Na through more medium filter, ultra-filtration equipment, nanofiltration high-pressure pump, the depth type filtration of nanofiltration concentrating unit more successively
2sO
4concentrated solution, guarantees that the floss in water body dirtyly can not block up film condensing device; Have two strands from described nanofiltration concentrating unit liquid out, one is through concentrated Na
2sO
4solution enters intermediate water tank from the first outlet collection, and one is only containing a small amount of Na
2sO
4solution from second outlet discharge process; Described nanofiltration concentrating unit is made up of two-stage nanofiltration, and the import of one-level nanofiltration device is connected with high-pressure pump, Na
2sO
4solution is discharged by the first outlet after concentrated, the permeate of one-level nanofiltration device is then connected with the second intermediate water tank, second intermediate water tank is connected with secondary high-pressure pump, pump into secondary nanofiltration device after the pressurization of secondary high-pressure pump to concentrate, the import that the concentrated solution after secondary nanofiltration device concentrates imports one-level nanofiltration device by the second outlet processes again;
Under the effect of high-pressure pump, filtrate is concentrated, guarantee the Na of dense water end (W.E.)
2sO
4concentration>=8%.Entering the product water power after concentrating unit process leads still higher, the product water of concentrating unit is entered reverse osmosis unit and carries out advanced desalination;
(5) nanofiltration is produced water further by reverse osmosis system process, obtain production pure water.Reverse osmosis system comprises the intermediate water tank producing water end (W.E.) with described nanofiltration concentrating unit and be connected, the reverse osmosis high-pressure pump, reverse osmosis unit and the reverse osmosis produced water tank that are connected successively with described intermediate water tank.Final reuse water specific conductivity≤500us/cm, final produce water for the production of.
As shown in Figure 3, through reclaiming system, raw materials for production are reclaimed: Fe (OH) 2, Na2SO4 and most pure water.Concrete data are in table 1:
Table 1
The benefit of reclaiming system:
1, social benefit: response country calls energy-saving and emission-reduction, and reduce total amount of pollutants discharged, saving water resource, improves the repeating utilization factor of water resources as far as possible.
2, economic benefit:
2-1, reclaiming system running cost:
The electricity charge: the actual total power of native system pump operation is 40KW.h, with production pure water 21.0m per hour
3processing wastewater, electric rate is 0.7 yuan, then the electricity charge are calculated as follows: 40KW.h × 0.7 yuan/kw.h ÷ 21m
3/ h=1.33 yuan/m
3;
Security personnel's filter element replacing expense: security personnel's filter element replacing cycle is 3-6 month, about 0.02 yuan/m
3;
Ultra-filtration membrane replacement cost: the ultrafiltration replacement cycle is 600 days, about 0.3 yuan/m
3;
Receive film replacement cost: the nanofiltration replacement cycle is 600 days, about 0.45 yuan/m
3;
Reverse osmosis membrane replacement cost: the reverse osmosis replacement cycle is 900 days, about 0.1 yuan/m
3;
The working cost of reuse pure water per ton is added up to be: the total=electricity charge+filter core expense+ultra-filtration membrane expense+nanofiltration membrane+reverse osmosis membrane expense=2.2 yuan/m
3;
Economic and Efficiency Analysis in Table 2:(by one day 20 hours)
Table 2
And the burden adopting traditional method not only to increase municipal wastewater pipe network to dispose of sewage; Also can increase enterprise operation cost: comprise medicament expense (NaOH, PAC, PAM etc.) and fee of sewage discharge.
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this specification sheets, as long as but be all subject to the protection of patent law in right of the present invention.
Claims (8)
1. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH)
2and Na
2sO
4technique, is characterized in that: comprise the following steps:
(1) ferric oxide coloured material production-line technique waste water is squeezed into wastewater equalization pond, after mixing, squeeze into reaction tank by lift pump, add sodium hydroxide solution and regulate, then enter elementary inclined-plate clarifying basin, form Fe (OH)
2throw out;
(2) Fe (OH) in elementary inclined-plate clarifying basin
2throw out adopts the mode of Cemented filling to deliver to ferrous sulfate workshop, and supernatant liquor enters intermediate pool;
(3) by aeration effect, the ferrous ion in supernatant liquor is converted to ferric ion, then adds sodium hydroxide solution and form Fe (OH)
3, removed by secondary inclined-plate clarifying basin;
(4) supernatant liquor of secondary inclined-plate clarifying basin enters clean water basin, by former water lift pump, the waste water in clean water basin is obtained Na through more medium filter, ultra-filtration equipment, nanofiltration high-pressure pump, the depth type filtration of nanofiltration concentrating unit more successively
2sO
4concentrated solution;
Have two strands from described nanofiltration concentrating unit liquid out, one is through concentrated Na
2sO
4solution enters intermediate water tank from the first outlet collection, and one is only containing a small amount of Na
2sO
4solution from second outlet discharge process; Described nanofiltration concentrating unit is made up of two-stage nanofiltration, and the import of one-level nanofiltration device is connected with high-pressure pump, Na
2sO
4solution is discharged by the first outlet after concentrated, the permeate of one-level nanofiltration device is then connected with the second intermediate water tank, second intermediate water tank is connected with secondary high-pressure pump, pump into secondary nanofiltration device after the pressurization of secondary high-pressure pump to concentrate, the import that the concentrated solution after secondary nanofiltration device concentrates imports one-level nanofiltration device by the second outlet processes again;
(5) nanofiltration is produced water further by reverse osmosis system process, obtain production pure water.
2. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 1
2and Na
2sO
4technique equipment therefor, it is characterized in that: it comprises the wastewater equalization pond (1) be connected with production-line technique waste water, described wastewater equalization pond is connected with lift pump (2) in turn, reaction tank (3) and elementary inclined-plate clarifying basin (4), the precipitation outlet of described elementary inclined-plate clarifying basin (4) is connected with sludge thickener (5), sludge thickener (5) is connected with pressure filter (6), the supernatant liquor outlet of described elementary inclined-plate clarifying basin (4) is connected with intermediate pool (7), described intermediate pool (7) is connected with secondary inclined-plate clarifying basin (8), described secondary inclined-plate clarifying basin (8) is connected with clean water basin (9) in turn, raw water pump (10), more medium filter (11), water tank (14) is produced in ultra-filtration equipment (13) and ultrafiltration, described ultrafiltration is produced water tank (14) and is connected with nanofiltration high-pressure pump (15) and nanofiltration concentrating unit (16), described nanofiltration concentrating unit (16) is connected with the first intermediate water tank (17), described first intermediate water tank (17) is connected with reverse osmosis system (18),
Described nanofiltration concentrating unit (16) is made up of two-stage nanofiltration, the import of one-level nanofiltration device (161) is connected with described nanofiltration high-pressure pump (15), solution is discharged by the first outlet (1611) after concentrated, permeate outlet (1612) of one-level nanofiltration device (161) is then connected with the second intermediate water tank (162), described second intermediate water tank (162) is connected with secondary high-pressure pump (163), pump into secondary nanofiltration device (164) after secondary high-pressure pump (163) pressurization to concentrate, the import that concentrated solution after secondary nanofiltration device (164) is concentrated imports one-level nanofiltration device (161) by the second outlet (1641) processes again.
3. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 2
2and Na
2sO
4technique equipment therefor, is characterized in that: described pressure filter (6) is plate-and-frame filter press.
4. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 3
2and Na
2sO
4technique equipment therefor, is characterized in that: be connected with accurate filter (12) between described more medium filter (11) and described ultra-filtration equipment (13).
5. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 4
2and Na
2sO
4technique equipment therefor, is characterized in that: described ultra-filtration equipment (13) is Full-automatic ultra-filtering device.
6. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 5
2and Na
2sO
4technique equipment therefor, is characterized in that: the outlet that water tank (14) is produced in described ultrafiltration be connected with to produce with described ultra-filtration equipment (13) that water end (W.E.) communicates for the anti-backwashing pump (19) cleaned.
7. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 6
2and Na
2sO
4technique equipment therefor, is characterized in that: described reverse osmosis system (18) comprises the reverse osmosis high-pressure pump (181), reverse osmosis unit (182) and the reverse osmosis produced water tank (183) that are connected successively.
8. ferric oxide coloured material Waste water concentrating system recoveries Fe (OH) according to claim 7
2and Na
2sO
4technique equipment therefor, is characterized in that: the working pressure scope of described nanofiltration high-pressure pump and reverse osmosis high-pressure pump is 0.5-16MPa.
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|---|---|---|---|
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| CN105036404B (en) * | 2015-06-30 | 2017-06-30 | 黄冈师范学院 | A kind of acid waste water Zero discharge treatment method after quartz sand powder or feldspar emery dust pickling purification |
| CN106731603A (en) * | 2016-12-27 | 2017-05-31 | 浙江久鼎机械有限公司 | A kind of exhaust treatment system |
| CN108751533A (en) * | 2018-06-05 | 2018-11-06 | 苏州聚微环保科技有限公司 | A kind of processing method of the acidic rinse waste water suitable for process of metal working |
| CN109292913B (en) * | 2018-10-23 | 2020-10-30 | 山东神邦环保科技有限公司 | Method for recovering sodium sulfate in cotton dyeing residual liquid by whole membrane method |
| CN114716085B (en) * | 2022-04-06 | 2023-05-16 | 浙江恒逸石化研究院有限公司 | Recycling method of waste water in production of silicon-aluminum inorganic coated titanium dioxide |
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|---|---|---|---|---|
| CN1370748A (en) * | 2002-03-08 | 2002-09-25 | 王泾阳 | Treatment process of ferric oxide pigments |
| CN102491452A (en) * | 2011-11-18 | 2012-06-13 | 吉林吉恩镍业股份有限公司 | Process for treating sodium sulfate wastewater by using nanofiltration-reverse osmosis combined membrane |
| CN203668140U (en) * | 2013-12-31 | 2014-06-25 | 浙江东洋环境工程有限公司 | Recovery device of wastewater concentration system for iron oxide coloring material |
-
2013
- 2013-12-31 CN CN201310747186.2A patent/CN103723849B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370748A (en) * | 2002-03-08 | 2002-09-25 | 王泾阳 | Treatment process of ferric oxide pigments |
| CN102491452A (en) * | 2011-11-18 | 2012-06-13 | 吉林吉恩镍业股份有限公司 | Process for treating sodium sulfate wastewater by using nanofiltration-reverse osmosis combined membrane |
| CN203668140U (en) * | 2013-12-31 | 2014-06-25 | 浙江东洋环境工程有限公司 | Recovery device of wastewater concentration system for iron oxide coloring material |
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Denomination of invention: Process and device for recovering Fe (OH)2and Na2so4by iron oxide coloring material wastewater concentration system Effective date of registration: 20211216 Granted publication date: 20150415 Pledgee: Nanxun Zhejiang rural commercial bank Limited by Share Ltd. and Fu sub branch Pledgor: ZHEJIANG DONGYANG ENVIRONMENTAL ENGINEERING Co.,Ltd. Registration number: Y2021330002548 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230531 Granted publication date: 20150415 Pledgee: Nanxun Zhejiang rural commercial bank Limited by Share Ltd. and Fu sub branch Pledgor: ZHEJIANG DONGYANG ENVIRONMENTAL ENGINEERING Co.,Ltd. Registration number: Y2021330002548 |