CN202829777U - Electroplating wastewater treatment system - Google Patents
Electroplating wastewater treatment system Download PDFInfo
- Publication number
- CN202829777U CN202829777U CN 201220424143 CN201220424143U CN202829777U CN 202829777 U CN202829777 U CN 202829777U CN 201220424143 CN201220424143 CN 201220424143 CN 201220424143 U CN201220424143 U CN 201220424143U CN 202829777 U CN202829777 U CN 202829777U
- Authority
- CN
- China
- Prior art keywords
- tank
- adsorption
- rice bran
- treatment system
- pond
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009713 electroplating Methods 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims description 16
- 241000209094 Oryza Species 0.000 claims abstract description 39
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 39
- 235000009566 rice Nutrition 0.000 claims abstract description 39
- 238000001179 sorption measurement Methods 0.000 claims abstract description 39
- 230000020477 pH reduction Effects 0.000 claims abstract description 23
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 19
- 230000003647 oxidation Effects 0.000 claims abstract description 12
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 12
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims abstract description 10
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical group N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 13
- 238000005273 aeration Methods 0.000 claims description 13
- 238000005374 membrane filtration Methods 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000000108 ultra-filtration Methods 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 3
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 abstract 2
- 239000003814 drug Substances 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 description 30
- 239000000126 substance Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 6
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
Description
技术领域 technical field
本实用新型涉及废水处理领域技术，尤其是指一种电镀废水处理系统。 The utility model relates to the technology in the field of wastewater treatment, in particular to an electroplating wastewater treatment system.
背景技术 Background technique
在电镀行业中，按照镀种和电镀工艺的不同，在生产过程中产生的废水主要包括含油废水、含不同络合难降解物废水、酸碱铜镍废水、含铬废水及含氰化物废水等几大类。其中超标最多的污染因子是铜离子、铬离子、镍离子、锌离子等重金属和氰化物等毒性较大，有些属于三致的剧毒物质;另外废水中含有的酸碱物质等污染物的混合废水，由于成份复杂，也是目前国内外处理和治理的难点。 In the electroplating industry, according to the different plating types and electroplating processes, the wastewater generated during the production process mainly includes oily wastewater, wastewater containing different complex refractory substances, acid-base copper-nickel wastewater, chromium-containing wastewater and cyanide-containing wastewater, etc. several categories. Among them, the most polluting factors exceeding the standard are copper ions, chromium ions, nickel ions, zinc ions and other heavy metals and cyanides, etc., which are highly toxic, some of which are highly toxic substances of the third type; in addition, the mixture of acid and alkali substances and other pollutants contained in wastewater Wastewater, due to its complex composition, is also a difficult point in domestic and foreign treatment and governance.
当前，对于电镀废水的处理主要以化学法为主。主要处理方法为化学沉淀法，含氰废水经过破氰、含铬废水经过铬还原后与综合废水一起通过调整pH值并投加混凝剂、高分子助凝剂等将金属离子、悬浮物和COD去除，使出水水质达到排放标准。这种处理工艺不能满足环保排放标准的要求，更无法满足生产中回用水的水质标准要求，造成了水资源的大量浪费。并且处理过程中需要投加大量药剂，处理费用高且易造成二次污染。 At present, the treatment of electroplating wastewater is mainly based on chemical methods. The main treatment method is the chemical precipitation method. After the cyanide-containing wastewater undergoes cyanide breaking and the chromium-containing wastewater undergoes chromium reduction, the metal ions, suspended solids and COD is removed to make the effluent water quality meet the discharge standard. This treatment process cannot meet the requirements of environmental protection discharge standards, let alone the water quality standards for reused water in production, resulting in a large waste of water resources. In addition, a large amount of chemicals need to be added in the process of treatment, and the treatment cost is high and it is easy to cause secondary pollution.
发明内容 Contents of the invention
有鉴于此，本实用新型针对现有技术存在之缺失，其主要目的是提供一种成本低、处理效果好的电镀废水处理系统。 In view of this, the utility model aims at the deficiencies of the prior art, and its main purpose is to provide an electroplating wastewater treatment system with low cost and good treatment effect.
为实现上述目的，本实用新型采用如下之技术方案：一种电镀废水处理系统，包括有预处理单元、吸附沉淀单元以及后处理单元，所述预处理单元设置有调节池、二级破氰池以及第一水解酸化池，所述吸附沉淀单元设置有一米糠吸附池以及一沉淀池，所述后处理单元依次连接有第二水解酸化池、接触氧化池和膜过滤池，所述第一水解酸化池与米糠吸附池相连接，所述沉淀池与第二水解酸化池相连接。 In order to achieve the above purpose, the utility model adopts the following technical scheme: an electroplating wastewater treatment system, including a pretreatment unit, an adsorption precipitation unit and a posttreatment unit, and the pretreatment unit is provided with a regulating pool and a secondary cyanide breaking pool And the first hydrolytic acidification tank, the adsorption and precipitation unit is provided with a rice bran adsorption tank and a sedimentation tank, the post-treatment unit is connected with the second hydrolytic acidification tank, contact oxidation tank and membrane filtration tank in sequence, the first hydrolysis acidification tank The pond is connected with the rice bran adsorption pond, and the sedimentation pond is connected with the second hydrolytic acidification pond.
作为一种优选方案，所述二级破氰池与第一水解酸化池之间设置有一砂滤罐。 As a preferred solution, a sand filter tank is arranged between the secondary cyanide breaking tank and the first hydrolytic acidification tank.
作为一种优选方案，所述膜过滤池中设置有浸没式超滤膜装置。 As a preferred solution, a submerged ultrafiltration membrane device is arranged in the membrane filtration tank.
作为一种优选方案，所述米糠吸附池中米糠的粒径为40~100目。 As a preferred solution, the particle size of the rice bran in the rice bran adsorption tank is 40-100 mesh.
作为一种优选方案，所述米糠吸附池中设置有第一曝气装置。 As a preferred solution, the rice bran adsorption pond is provided with a first aeration device.
作为一种优选方案，所述接触氧化池中设置有第二曝气装置。 As a preferred solution, the contact oxidation tank is provided with a second aeration device.
作为一种优选方案，所述膜过滤池中设置有第三曝气装置。 As a preferred solution, a third aeration device is arranged in the membrane filter tank.
作为一种优选方案，所述沉淀池连接有一污泥处理装置。 As a preferred solution, the sedimentation tank is connected with a sludge treatment device.
作为一种优选方案，所述接触氧化池和膜过滤池分别与污泥处理装置相连通。 As a preferred solution, the contact oxidation tank and the membrane filter tank are respectively connected with the sludge treatment device.
本实用新型与现有技术相比具有明显的优点和有益效果，具体而言：本实用新型采用米糠吸附池，不需要投加大量药剂，能够有效去除电镀废水中的重金属离子，同时该米糠吸附池中的吸附材料主要由价格低廉的米糠为吸附载体，而且该吸附载体能够有效吸附重金属离子，不仅降低了电镀废水的处理费用，而且大大提高了电镀废水中重金属的处理效率。米糠作为生物能源，吸附重金属后可直接进行生物发酵处理，可做花草树木等植物的肥料亦可做沼气原料进行资源再利用。 Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, the utility model adopts the rice bran adsorption pool, does not need to add a large amount of chemicals, and can effectively remove heavy metal ions in the electroplating wastewater. At the same time, the rice bran adsorption The adsorption material in the pool is mainly made of cheap rice bran as the adsorption carrier, and the adsorption carrier can effectively adsorb heavy metal ions, which not only reduces the treatment cost of electroplating wastewater, but also greatly improves the treatment efficiency of heavy metals in electroplating wastewater. As a bioenergy, rice bran can be directly processed by biofermentation after absorbing heavy metals. It can be used as fertilizer for plants such as flowers, trees and trees, and can also be used as raw material for biogas for resource reuse. the
附图说明 Description of drawings
图1是本实用新型之实施例的电镀废水处理系统的流程图。 Fig. 1 is a flowchart of an electroplating wastewater treatment system according to an embodiment of the present invention.
具体实施方式 Detailed ways
请参照图1所示，其显示了本实用新型之较佳实施例的具体结构，一种电镀废水处理系统，包括有预处理单元、吸附沉淀单元以及后处理单元。 Please refer to Figure 1, which shows the specific structure of a preferred embodiment of the present invention, an electroplating wastewater treatment system, including a pretreatment unit, an adsorption precipitation unit and a post-treatment unit.
其中，该预处理单元设置有调节池、二级破氰池以及第一水解酸化池，该二级破氰池与第一水解酸化池之间设置有一砂滤罐。 Wherein, the pretreatment unit is provided with a regulating tank, a secondary cyanide breaking tank and a first hydrolytic acidification tank, and a sand filter tank is arranged between the secondary cyanide breaking tank and the first hydrolytic acidification tank.
该吸附沉淀单元设置有一米糠吸附池以及一沉淀池，该米糠吸附池与前述第一水解酸化池相连接。该米糠吸附池中米糠的粒径为40~100目并经过活化处理，使其具有更好的重金属吸附效率，特别是需要在米糠粉碎后及时进行稳定化处理，经过处理的米糠对各种重金属离子均有吸附作用。在米糠吸附池中，通过添加药剂将废水调节至偏碱性，在这种环境下能够提高米糠吸附重金属的效率。该米糠吸附池中设置有第一曝气装置，该第一曝气装置主要作用是促进米糠与废水充分接触，提高吸附效率。该沉淀池连接有一污泥处理装置，由于米糠吸水后会沉淀，所以设置一沉淀池能够有效将处理好的废水与吸附有重金属的米糠进行分离，废水进入下一步继续进行处理，米糠废料排入污泥处理装置中进行处理。 The adsorption and precipitation unit is provided with a rice bran adsorption tank and a sedimentation tank, and the rice bran adsorption tank is connected with the aforementioned first hydrolytic acidification tank. The rice bran in the rice bran adsorption pool has a particle size of 40-100 mesh and has been activated to make it have better heavy metal adsorption efficiency. In particular, it needs to be stabilized in time after the rice bran is crushed. The treated rice bran is resistant to various heavy metals. Ions are adsorbed. In the rice bran adsorption tank, the wastewater is adjusted to be alkaline by adding chemicals, which can improve the efficiency of rice bran adsorption of heavy metals in this environment. The rice bran adsorption pond is provided with a first aeration device, and the main function of the first aeration device is to promote full contact between the rice bran and waste water and improve the adsorption efficiency. The settling tank is connected with a sludge treatment device. Since the rice bran will settle after absorbing water, setting up a settling tank can effectively separate the treated wastewater from the rice bran adsorbed with heavy metals. treated in the sludge treatment plant.
该后处理单元依次连接有第二水解酸化池、接触氧化池和膜过滤池，该第二水解酸化池与前述沉淀池相连接。该接触氧化池中挂设有供微生物生存的载体，微生物可在该载体上生存并分解水中有机物；该膜过滤池中设置有浸没式超滤膜装置。该接触氧化池设置有第二曝气装置，该膜过滤池中设置有第三曝气装置。该接触氧化池和膜过滤池分别与上述污泥处理装置相连通。 The post-treatment unit is sequentially connected with a second hydrolytic acidification tank, a contact oxidation tank and a membrane filtration tank, and the second hydrolytic acidification tank is connected with the aforementioned sedimentation tank. The contact oxidation tank is hung with a carrier for microorganisms to live on, and the microorganisms can survive on the carrier and decompose organic matter in water; the membrane filter tank is equipped with a submerged ultrafiltration membrane device. The contact oxidation tank is provided with a second aeration device, and the membrane filter tank is provided with a third aeration device. The contact oxidation tank and the membrane filter tank are respectively communicated with the above-mentioned sludge treatment device.
详述本实施例的工作过程如下： The working process of present embodiment is described in detail as follows:
首先，电镀废水进入调节池进行初沉淀，同时调整废水的水质和水量；接着废水进入二级破氰池中进行破氰，去除废水中的氰化物等有害物质；接着废水从二级破氰池中进入第一水解酸化池进行水解酸化，将难降解的高分子化合物分解成较小分子。经水解酸化处理后的废水进入米糠吸附池中，投加相关化学药剂，将水质调节至偏碱性，如此有利于米糠的吸附作用，提高重金属的去除效率，启动第一曝气装置，使废水中的重金属离子被米糠材料充分吸收；接着将废水及米糠混合物排入沉淀池中进行沉淀，经沉淀的米糠等污物排入污泥处理装置中，沉淀池中的上清液排入第二水解酸化池中进行进一步处理，最后启动第二曝气装置和第三曝气装置，废水进入接触氧化池中除去废水中有机物后进入膜过滤池中进行膜过滤，经膜过滤后的滤液可回用于工业生产中。 First, the electroplating wastewater enters the regulating tank for initial precipitation, and at the same time adjusts the water quality and water volume of the wastewater; then the wastewater enters the secondary cyanide breaking tank for cyanide breaking to remove harmful substances such as cyanide in the wastewater; then the wastewater flows from the secondary cyanide breaking tank Enter the first hydrolytic acidification pool for hydrolysis and acidification, and decompose the refractory polymer compounds into smaller molecules. The wastewater after hydrolysis and acidification treatment enters the rice bran adsorption pool, and relevant chemicals are added to adjust the water quality to be alkaline, which is conducive to the adsorption of rice bran and improves the removal efficiency of heavy metals. The first aeration device is activated to make the wastewater The heavy metal ions in the rice bran are fully absorbed by the rice bran material; then the waste water and the rice bran mixture are discharged into the sedimentation tank for precipitation, the settled rice bran and other dirt are discharged into the sludge treatment device, and the supernatant in the sedimentation tank is discharged into the second Further treatment is carried out in the hydrolysis acidification tank, and finally the second aeration device and the third aeration device are started. The wastewater enters the contact oxidation tank to remove organic matter in the wastewater, and then enters the membrane filtration tank for membrane filtration. The filtrate after membrane filtration can be returned to Used in industrial production.
本实用新型的设计重点在于：本实用新型采用米糠吸附池，不需要投加大量药剂，能够有效去除电镀废水中的重金属离子，同时该米糠吸附池中的吸附材料主要由价格低廉的米糠为吸附载体，而且该吸附载体能够有效吸附重金属离子，不仅降低了电镀废水的处理费用，而且大大提高了电镀废水中重金属的处理效率。米糠作为生物能源，吸附重金属后可直接进行生物发酵处理，可做花草树木等植物的肥料亦可做沼气原料进行资源再利用。 The key points of the design of the utility model are: the utility model adopts the rice bran adsorption pool, which can effectively remove the heavy metal ions in the electroplating wastewater without adding a large amount of chemicals. Carrier, and the adsorption carrier can effectively adsorb heavy metal ions, which not only reduces the treatment cost of electroplating wastewater, but also greatly improves the treatment efficiency of heavy metals in electroplating wastewater. As a bioenergy, rice bran can be directly processed by biofermentation after absorbing heavy metals. It can be used as fertilizer for plants such as flowers, trees and trees, and can also be used as raw material for biogas for resource reuse.
以上所述，仅是本实用新型的较佳实施例而已，并非对本实用新型的技术范围作任何限制，故凡是依据本实用新型的技术实质对以上实施例所做的任何细微修改和等同变化，均仍属于本实用新型技术方案的范围内。 The above are only preferred embodiments of the present utility model, and are not intended to limit the technical scope of the present utility model, so any minor modifications and equivalent changes made to the above embodiments according to the technical essence of the present utility model, All still belong to within the scope of the technical solution of the utility model.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424143 CN202829777U (en) | 2012-08-25 | 2012-08-25 | Electroplating wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220424143 CN202829777U (en) | 2012-08-25 | 2012-08-25 | Electroplating wastewater treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202829777U true CN202829777U (en) | 2013-03-27 |
Family
ID=47941532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220424143 Expired - Fee Related CN202829777U (en) | 2012-08-25 | 2012-08-25 | Electroplating wastewater treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202829777U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395933A (en) * | 2013-08-02 | 2013-11-20 | 江苏和顺环保股份有限公司 | Processing technology for electroplating wastewater and heavy metal wastewater |
| CN103482821A (en) * | 2013-09-12 | 2014-01-01 | 安徽省绿巨人环境技术有限公司 | Technology for treating electronic circuit board manufacturing process waste water |
-
2012
- 2012-08-25 CN CN 201220424143 patent/CN202829777U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103395933A (en) * | 2013-08-02 | 2013-11-20 | 江苏和顺环保股份有限公司 | Processing technology for electroplating wastewater and heavy metal wastewater |
| CN103482821A (en) * | 2013-09-12 | 2014-01-01 | 安徽省绿巨人环境技术有限公司 | Technology for treating electronic circuit board manufacturing process waste water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104261526B (en) | Treatment method of heavy metal wastewater | |
| CN103482821B (en) | Technology for treating electronic circuit board manufacturing process waste water | |
| CN102923890A (en) | Method for treating pharmaceutical wastewater | |
| CN105366884A (en) | Printed circuit board sewage treatment method | |
| CN202558715U (en) | Treatment and reuse device for electrolytic manganese industrial wastewater | |
| CN104761039B (en) | A kind of association complex processing cadmium wastewater and application process thereof | |
| CN103112970A (en) | Heavy metal recovery and zero emission system and process | |
| CN106430798A (en) | Acidic oil wastewater treatment process | |
| CN101973661B (en) | Treatment method of processing wastewater of Chinese galls | |
| CN205740686U (en) | A kind of coking wastewater of iron and steel plant processing means | |
| CN104211232A (en) | Method for coal ash and scrap iron combined treatment of dyeing and printing wastewater | |
| CN205099523U (en) | Heavy metal wastewater handles and recovery system | |
| CN105668839A (en) | Technology for treating heavy metal waste water through macroalgae | |
| CN203307440U (en) | Recycling device for processing copper ions in electroplating wastewater | |
| CN102225814B (en) | Fluorine-containing waste water processing apparatus and processing method thereof | |
| CN205442889U (en) | Coking wastewater treatment device | |
| CN204958675U (en) | Novel electroplating wastewater treatment device | |
| CN100545106C (en) | A kind of sewage treatment method for acetylene production | |
| CN210559747U (en) | Industrial heavy metal sewage treatment system | |
| CN108264163B (en) | A process for treating electroplating wastewater | |
| CN205313221U (en) | " deposit + complexing " be filter effects's heavy metal wastewater purifier in coordination | |
| CN106396289A (en) | Agricultural sewage purifying apparatus | |
| CN107082500B (en) | Lead-containing reclaimed water is not discharged and self-purified and reused | |
| CN111747569A (en) | Method for efficiently removing metal ions in sewage | |
| CN103466891A (en) | Treatment process for corn processing wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20130825 |