CN1331054A - Intermittent automatic process and equipment for treating waste water - Google Patents
Intermittent automatic process and equipment for treating waste water Download PDFInfo
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- CN1331054A CN1331054A CN 00116872 CN00116872A CN1331054A CN 1331054 A CN1331054 A CN 1331054A CN 00116872 CN00116872 CN 00116872 CN 00116872 A CN00116872 A CN 00116872A CN 1331054 A CN1331054 A CN 1331054A
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- wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000004065 wastewater treatment Methods 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 5
- 230000015271 coagulation Effects 0.000 claims description 5
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000701 coagulant Substances 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 2
- 150000004692 metal hydroxides Chemical class 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008021 deposition Effects 0.000 abstract 1
- 239000003814 drug Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010979 pH adjustment Methods 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000001455 metallic ions Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
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- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
An intermittent-type automatic process and equipment for treating waste water features that under the control of PLC and PH/ORP monitor instrument, the whole treating procedure is performed by program in step by step mode, and the water-collecting pool, reactor and deposition pool are combined into a whole. Its advantages include less investment and possessed ground area, high automatic level and high effect.
Description
The invention relates to a wastewater treatment process and equipment, in particular to an intermittent automatic wastewater treatment process and equipment.
For small-batch heavy metal and acid-base wastewater with large load change, a method of manually adding medicaments is adopted for treatment in the past, and a PH and oxidation-reduction potential (ORP) instrument is gradually adopted to control a medicament adding treatment process at present. Although the progress is great from manual to control with a PH/ORP meter, this is only a semi-automated control process. For electroplating industry, the waste water has the characteristics of small water quantity, large concentration fluctuation, larger labor intensity by using the current treatment mode, difficult control, and larger medicine consumption and various material consumption. The existing treatment equipment comprises a water collecting tank, a reactor, a sedimentation tank, a sludge dewatering machine, a terminal controller and the like, and the whole set of equipment also needs a plurality of intermediate pipeline connecting links and lifting conveying pumps, so that the occupied area is large, and the equipment investment is high.
The invention aims to overcome the defects of the prior art and provide an intermittent automatic wastewater treatment process and equipment which can fully automatically control the treatment process, and has reasonable medicine consumption and material consumption, low equipment investment and small occupied area.
The purpose of the invention can be realized by the following technical scheme: the intermittent automatic waste water treating process includes the following steps: firstly, conveying wastewater, namely conveying the wastewater in a wastewater pool into an intermittent reactor through a pipeline and a wastewater conveying pump; secondly, acidifying or adding alkali, oxidizing-reducing and neutralizing reaction, automatically adding acid or alkali under the control of a pH instrument, adjusting the pH value of the wastewater to avalue required by the oxidizing or reducing reaction, automatically adding an oxidant or a reducer under the control of an ORP instrument, oxidizing or reducing cyanide or hexavalent chromium in the wastewater, and then adjusting the pH value of the wastewater to enable main pollutant heavy metal ions in the wastewater to form hydroxide precipitate; thirdly, performing coagulation reaction, namely adding a coagulant to perform coagulation reaction so as to enable the metal hydroxide to form larger particles; fourthly, solid-liquid separation is carried out, the wastewater after the precipitation is sent into a filter press by a pneumatic diaphragm pump, the precipitated sludge is intercepted and removed, and the clear water is discharged through a filter layer; and fifthly, adjusting the pH value at the terminal, and automatically adding sulfuric acid into the filtered clear water by adopting a proportional control technology to adjust the pH value to be in the range of 6-9 emission standard.
The intermittent automatic wastewater treatment equipment comprises a wastewater tank, an intermittent reactor and a dosing tank, wherein the dosing tank is composed of an acid tank, an alkali tank, a reducing agent or oxidant tank and a flocculating agent tank, the intermittent reactor is provided with a PH/ORP instrument capable of controlling each dosing pump to act, the intermittent reactor is respectively connected with the wastewater tank and each dosing tank through a pipeline and an infusion pump, the intermittent reactor further comprises a PLC (programmable logic controller), a plate-and-frame filter press and a terminal PH regulator, the PLC is connected with each treatment device, an inlet of the plate-and-frame filter press is connected with the intermittent reactor through a pipeline and a pneumatic diaphragm pump, an outlet of the plate-and-frame filter press is connected with the terminal PH regulator through a pipeline, and an inlet of the terminal PH regulator is also connected with the acid tank through a pipeline and an infusion pump.
The wastewater pool and the intermittent reactor are both provided with liquid level meters.
The batch reactor is provided with a mechanical stirrer or an air stirrer controlled by an electromagnetic valve.
In the wastewater treatment, the most important is the equipment investment, the treatment effect and the operation cost, and the invention has more value for enterprises with short fields. Compared with the prior art, the invention integrates the three parts of the water collecting tank, the reactor and the sedimentation tank of the traditional equipment into a whole, the whole set of equipment also reduces a plurality of intermediate pipeline connecting links and lifting delivery pumps, and the full automation of the treatment process is realized by combining the PLC technology and the PH/ORP automatic control technology. The intermittent treatment method realizes automatic control, so that the control of the treatment process is stricter and the materials are more accurate, and the invention reduces the human consumption, the material consumption and the power consumption on the premise of ensuring the treatment effect, thereby reducing the treatment cost of unit water volume.
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a process flow diagram of the terminal pH adjustment technique of the present invention.
The invention is further explained below with reference to the drawings and the embodiments.
Examples
For example, a set of wastewater treatment equipment for treating hexavalent chromium, which comprises a wastewater disposal basin 1, an intermittent reactor 2, a plate-and-frame filter press 3, dosing tanks 41-44, a terminal PH regulator 5 and a PLC programmable controller, is of a modular structure, can be assembled at will, and can be installed according to the needs of users and the size of the existing site. The electric control system is provided with a three-gear change-over switch, when the switch is arranged in an automatic gear, the system is completely automatically controlled by a PLC, when the switch is arranged in a manual gear, no matter any step is carried out in the process of an automatic control system, the system can jump out of the PLC system and is controlled by a manual button, and when the system is stopped, all motors can not be started.
The waste water pump P1(220V 300W) is controlled by liquid level, when the liquid level L1 of the waste water tank 1 is at low level, the P1 pump can not be started, when the liquid level L2 of the reactor 2 is at high level, the P1 pump stops working, when the liquid level in the reactor 2 does not reach high level, but the liquid level in the waste water tank 1 reaches low level, the P1 is in a waiting condition until the liquid level recovers, and the P1 pump continues working.
The P1 pump stops working, simultaneously, the electromagnetic valve V1(220V 100W) or the stirring motor of the air stirrer 21 is controlled to start, the pH1 meter is started, the relay A of the meter controls the acid adding process of the P5 pump (220V 40W), the P5 pump is connected with the acid tank 44, the output of the relay B of the meter is normally locked at the moment, the ORP meter is started after the pH reaches the set point value and stabilizes for 5 minutes, the relay A of the meter starts to control the acid adding process of the oxidation reduction reaction of the P4 pump (220V, 40W), the P4 pump is connected with the reducing agent tank 43, the acid adding ofthe P5 pump is controlled to add acid by the pH1 meter at the moment, and the pH and the ORP stabilize for 5 minutes when the pH and the ORP reach the set point value.
When the second step is completed, the ORP meter is closed, the relay A of the pH1 meter is locked, the relay B is unlocked at the moment, the dosing process for controlling the precipitation reaction of the P3 pump (220V, 40W) is started, the P3 pump is connected with the alkali tank 42, the P2 pump (220V, 40W) is started for 5 minutes, whether the pH value is repeated or not, the P2 is not started, and when the pH value is stabilized for 5 minutes after reaching the set point value, the P2 pump is connected with the flocculant tank 41.
Fourthly, when the reaction in the third step is finished, the pH1 instrument and the P2 and P3 pumps thereof are closed, meanwhile, the electromagnetic valve V2(220V, 100W) of the P7 diaphragm pump air source is controlled to be opened, the pH2 instrument is controlled to be opened, the acid adding process of the P6 metering pump is controlled, and the plate-and-frame filter press 3 and the terminal pH controller 5 are simultaneously opened.
And fifthly, when the liquid level of the reactor is at a low level, closing the electromagnetic valve V1, stopping stirring, delaying for 10 minutes (adjustable in a PLC), closing the electromagnetic valve V2 (not shown), and stopping the operation of P7.
When the P7 stops working, another cycle is started.
One additional spare circuit (220V 200W) is provided for possible stirring of the coagulant PAM, the motor being controlled by a push button, whether the three-position switch is automatic or manual.
PH/ORP control
Treating chromium-containing wastewater:
reduction reaction
The A relay of the PH1 is set to a HIGH level (HIGH) and the set point is 2.5-3.0
The relay A of the ORP is set to a HIGH level (HIGH), and the set point is 280-400 mV
Neutralization reaction
The B relay of the PH1 is set to be LOW (LOW), and the set point is 8.2-10.5
Treating cyanide-containing wastewater:
oxidation reaction
PHl, the A relay is set to LOW (LOW) and the set point is 10.2-10.8
The A relay of the ORP is set to be LOW (LOW), and the set point is 300-400 mV
Neutralization reaction
The B relay of the PH1 is set to a HIGH level (HIGH) and the set point is 8.2-10.5
Acid, alkali and heavy metal:
neutralization reaction
The B relay of the PH1 is set to be LOW (LOW), and the set point is 8.2-10.5
The process adopts a mature chemical-precipitation method to treat the wastewater, and the basic principle of wastewater treatment is briefly explained below.
1. Chemical reaction
Metal (Cu) under acidic conditions2+.Ni2+.Cr3+Etc.) and non-metallic ions (CN)-.H+.OH-) Dissolved in the wastewater in an ionic state, and can be discharged only when the wastewater is treated to reach the national discharge standard. Because the oxidation-reduction reaction is carried out under the condition of a certain PH value, firstly, a certain amount of acid or alkali is added under the control of a PH meter, secondly, sodium pyrosulfite or sodium hypochlorite is added under the control of an ORP meter to reduce hexavalent chromium into trivalent chromium, and cyanide is oxidized into nontoxic CNO-. The specific reaction is as follows:
and (3) oxidation reaction:
or
Reduction reaction:
the pH of the wastewater is gradually increased with the addition of sodium hydroxide, and the dissolved Mn is obtained when the pH is increased to a pH (about 10) required for metal precipitation+Conversion to insoluble M (OH)nAnd (4) precipitating.
2. Coagulating sedimentation
Hydroxide precipitates are generated in the chemical reaction process, in order to accelerate the precipitation speed and improve the precipitation effect, a coagulant is added into the wastewater, and the hydroxide forms larger particles after coagulation reaction to precipitate. The precipitate is dewatered and dried by a plate and frame filter press, and clear liquid is further processed.
3. Terminal pH adjustment
In order to ensure that the metal ions in the wastewater meet the discharge standard, the sodium hydroxide must be added in an amount to achieve a certain pH value, but the pH value may exceed the discharge standard of 6-9. Therefore, the pH of the clear solution must be adjusted after the solid-liquid separation is completed. During the adjustment, sulfuric acid is added into the waste water to reduce the pH value of the waste water to be within the discharge standard. The chemical reaction equation is as follows:
the traditional method for adjusting the pH value is to prepare a reaction tank with a certain volume according to the water quantity, and add acid or alkali by a pump or a valve while stirring under the control of a pH meter, and the traditional control mode is widely applied in the field of wastewater treatment and has the defects that: the adaptability to water quantity and PH change is poor, and the PH control fluctuation range is large. The PH control of the terminal of the equipment is not the traditional switch (ON/OFF) control, but a proportional control technology which is widely applied by other industries, as shown in figure 2, a dosing tank 4 measures signals according to a sensor 51, a PH instrument 52 sends out 4-20mA signals according to a set value, and then the signals are processed by a PLC, a metering pump 53 doses medicine according to the signal proportion, the metering pump 53 is connected with the dosing tank 4, and the dose of the added medicine can be correspondingly changed along with the change of water quantity and PH. The device overcomes the defects of the traditional method, removes mechanical stirring and a huge reactor, utilizes the mixing action of a pipeline and a terminal, adds medicine according to the proportion of a metering pump, overcomes the defect of inconvenience in calibration of a pipeline reaction PH sensor, can fully adapt to the change of water quantity and PH, and keeps the stability of the effluent PH. The application of the terminal pH adjusting technology to the intermittent wastewater treatment process has not been successful at home and abroad.
The wastewater treatment is a relatively complex process, each step must be strictly controlled, and the treatment effect is difficult to ensure through manual operation. The full-automatic control of the equipment operation can be realized by applying the PLC control technology. The PLC can receive signals sent by the liquid level controller and the pH meter and control the actions of the waste water pump, the dosing pump, the sludge pump and the electromagnetic valve. And the time from the beginning of wastewater treatment to the final discharge of each treatment step can be accurately set according to the control program programmed according to the wastewater treatment process requirements, so that the whole wastewater treatment process is orderly carried out. The program or time can be modified as necessary to achieve optimal control.
Claims (4)
1. The intermittent automatic waste water treating process features that the waste water treating process includes the following steps: firstly, conveying wastewater, namely conveying the wastewater in a wastewater pool into an intermittent reactor through a pipeline and a wastewater conveying pump; secondly, acidifying or adding alkali, oxidizing-reducing and neutralizing, automatically adding acid or alkali under the control of a pH instrument, adjusting the pH value of the wastewater to a value required by the oxidizing or reducing reaction, automatically adding an oxidant or a reducing agent under the control of an oxidation-reduction potential instrument, oxidizing or reducing cyanide or hexavalent chromium in the wastewater, and then adjusting the pH value of the wastewater to enable main pollutant heavy metal ions in the wastewater to form hydroxide precipitates; thirdly, performing coagulation reaction, namely adding a coagulant to perform coagulation reaction so as to enable the metal hydroxide to form larger particles; fourthly, solid-liquid separation is carried out, the wastewater after the precipitation is sent into a filter press by a pneumatic diaphragm pump, the precipitated sludge is intercepted and removed, and the clear water is discharged through a filter layer; and fifthly,adjusting the pH value at the terminal, and automatically adding sulfuric acid into the filtered clear water by adopting a proportional control technology to adjust the pH value to be in the range of 6-9 emission standard.
2. The intermittent automatic wastewater treatment equipment is characterized by further comprising a programmable controller, a plate and frame filter press and a terminal PH regulator, wherein the programmable controller is connected with each treatment device, an inlet of the plate and frame filter press is connected with the intermittent reactor through a pipeline and a pneumatic diaphragm pump, an outlet of the plate and frame filter press is connected with the terminal PH regulator through a pipeline, and an inlet of the terminal PH regulator is connected with the acid tank through a pipeline and a transfusion pump.
3. A batch-type automated wastewater treatment plant according to claim 2, wherein said wastewater basin and said batch reactor are provided with level gauges.
4. A batch type automated wastewater treatment facility according to claim 2, characterized in that the batch reactor is provided with a mechanical stirrer or an air stirrer controlled by a solenoid valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00116872XA CN1147436C (en) | 2000-06-29 | 2000-06-29 | Intermittent automatic process and equipment for treating waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00116872XA CN1147436C (en) | 2000-06-29 | 2000-06-29 | Intermittent automatic process and equipment for treating waste water |
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| Publication Number | Publication Date |
|---|---|
| CN1331054A true CN1331054A (en) | 2002-01-16 |
| CN1147436C CN1147436C (en) | 2004-04-28 |
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|---|---|---|---|
| CNB00116872XA Expired - Fee Related CN1147436C (en) | 2000-06-29 | 2000-06-29 | Intermittent automatic process and equipment for treating waste water |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357195C (en) * | 2004-06-03 | 2007-12-26 | 同济大学 | Automatic controlling method and controller for treating urban waste water by suspending filler bed |
| CN101921013A (en) * | 2010-03-10 | 2010-12-22 | 田农 | Method for realizing reliable standard emission for electroplating wastewater by pure chemical precipitation method |
| CN103268127A (en) * | 2013-05-27 | 2013-08-28 | 天津市环境保护科学研究院 | Device and method for controlling automatic feeding of single-factor lime to pickling waste water in iron and steel industry |
| CN104049565A (en) * | 2014-05-26 | 2014-09-17 | 范振捷 | Method for controlling industrial wastewater level |
| CN105540928A (en) * | 2016-01-12 | 2016-05-04 | 胡明成 | Integrated wastewater treatment device and treating method thereof |
| CN105668766A (en) * | 2016-04-11 | 2016-06-15 | 徐州工程学院 | Device and method for removing heavy metal ions in industrial sewage |
| CN106277427A (en) * | 2016-04-28 | 2017-01-04 | 南京霖厚环保科技有限公司 | Electroplating comprehensive waste water Intelligent processing device and control method thereof |
| CN106830116A (en) * | 2017-02-15 | 2017-06-13 | 天津大学 | For the exceeded early warning and alert devices and methods therefor of acid waste water ferrous ion |
| CN107986501A (en) * | 2017-12-26 | 2018-05-04 | 上海亨远船舶设备有限公司 | A kind of processing unit and its application method for ship tail gas desulfurization wastewater |
| CN115385481A (en) * | 2022-09-09 | 2022-11-25 | 上海市离心机械研究所有限公司 | Processing device, system and control method for banknote printing wastewater |
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2000
- 2000-06-29 CN CNB00116872XA patent/CN1147436C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357195C (en) * | 2004-06-03 | 2007-12-26 | 同济大学 | Automatic controlling method and controller for treating urban waste water by suspending filler bed |
| CN101921013A (en) * | 2010-03-10 | 2010-12-22 | 田农 | Method for realizing reliable standard emission for electroplating wastewater by pure chemical precipitation method |
| CN101921013B (en) * | 2010-03-10 | 2013-03-13 | 田农 | Method for realizing reliable standard emission for electroplating wastewater by pure chemical precipitation method |
| CN103268127A (en) * | 2013-05-27 | 2013-08-28 | 天津市环境保护科学研究院 | Device and method for controlling automatic feeding of single-factor lime to pickling waste water in iron and steel industry |
| CN104049565A (en) * | 2014-05-26 | 2014-09-17 | 范振捷 | Method for controlling industrial wastewater level |
| CN105540928A (en) * | 2016-01-12 | 2016-05-04 | 胡明成 | Integrated wastewater treatment device and treating method thereof |
| CN105668766A (en) * | 2016-04-11 | 2016-06-15 | 徐州工程学院 | Device and method for removing heavy metal ions in industrial sewage |
| CN106277427A (en) * | 2016-04-28 | 2017-01-04 | 南京霖厚环保科技有限公司 | Electroplating comprehensive waste water Intelligent processing device and control method thereof |
| CN106277427B (en) * | 2016-04-28 | 2019-02-01 | 南京霖厚环保科技有限公司 | Electroplating comprehensive waste water Intelligent processing device and its control method |
| CN106830116A (en) * | 2017-02-15 | 2017-06-13 | 天津大学 | For the exceeded early warning and alert devices and methods therefor of acid waste water ferrous ion |
| CN106830116B (en) * | 2017-02-15 | 2020-03-17 | 天津大学 | Early warning and predicting device and method for exceeding ferrous ions in acidic wastewater |
| CN107986501A (en) * | 2017-12-26 | 2018-05-04 | 上海亨远船舶设备有限公司 | A kind of processing unit and its application method for ship tail gas desulfurization wastewater |
| CN115385481A (en) * | 2022-09-09 | 2022-11-25 | 上海市离心机械研究所有限公司 | Processing device, system and control method for banknote printing wastewater |
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|---|---|
| CN1147436C (en) | 2004-04-28 |
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