Shanghai Jinzhao Energy Saving Technology Co., Ltd.

China

Back to Profile

1-12 of 12 for Shanghai Jinzhao Energy Saving Technology Co., Ltd. Sort by
Query
Aggregations
Jurisdiction
        United States 9
        World 3
Date
2022 2
2021 3
2020 6
Before 2020 1
IPC Class
B23Q 11/10 - Arrangements for cooling or lubricating tools or work 9
B23C 1/06 - Milling machines not designed for particular work or special operations with one vertical working-spindle 4
B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools 4
B23Q 3/155 - Arrangements for automatic insertion or removal of tools 3
B01D 45/16 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream 2
See more
Status
Pending 2
Registered / In Force 10
Found results for  patents

1.

Internal cooling/external cooling-switching milling minimum-quantity-lubrication intelligent nozzle system and method

      
Application Number 17341326
Grant Number 11794297
Status In Force
Filing Date 2021-06-07
First Publication Date 2022-05-12
Grant Date 2023-10-24
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
  • SHANXI JINZHAO AVIATION TECHNOLOGY CO., LTD. (China)
Inventor
  • Li, Changhe
  • Wu, Xifeng
  • Han, Yixue
  • Zhang, Naiqing
  • Zhang, Yanbin
  • Wu, Qidong
  • Cao, Huajun
  • Gao, Teng
  • Yang, Min
  • Lu, Bingheng
  • Yang, Yuying
  • Cui, Xin
  • Zhao, Xufeng
  • Liu, Mingzheng
  • Jia, Dongzhou
  • Zhang, Xiaowei
  • Ma, Hao

Abstract

The present disclosure provides an internal cooling/external cooling-switching milling minimum-quantity-lubrication intelligent nozzle system and method, relating to the field of milling lubrication. The system includes: a vision system, configured to acquire a real-time milling depth of a workpiece and send the real-time milling depth to a lubrication manner controller for processing; a lubrication system, including an internal cooling system and an external cooling system connected together to a cutting fluid supply source through a reversing device; and the lubrication manner controller, configured to communicate with the vision system and the lubrication system respectively, and control the reversing device to act according to a set milling depth threshold and data acquired by the vision system, so as to adjust and switch to the internal cooling system or the external cooling system to work. Milling depth data of a machine tool is collected, the milling depth data is transmitted to a control center for data analysis and processing, the data is compared with an initially set internal cooling/external cooling switching threshold to obtain the most suitable cooling and lubrication manner under current machining conditions of the machine tool, and the control center controls the internal cooling and external cooling systems according to the obtained result to realize intelligent switching of the cooling and lubrication manner between internal cooling and external cooling.

IPC Classes  ?

  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B23C 5/28 - Features relating to lubricating or cooling
  • B23Q 17/24 - Arrangements for indicating or measuring on machine tools using optics

2.

Intelligent switching system for switching internal cooling and external cooling based on minimal quantity lubrication and method

      
Application Number 17406746
Grant Number 11819932
Status In Force
Filing Date 2021-08-19
First Publication Date 2022-05-12
Grant Date 2023-11-21
Owner
  • Qingdao University of Technology (China)
  • Shanghai Jinzhao Energy Saving Technology Co., Ltd. (China)
  • Shaanxi Jinzhao Aviation Technology Co., Ltd. (China)
Inventor
  • Li, Changhe
  • Wu, Xifeng
  • Han, Yixue
  • Zhang, Naiqing
  • Wu, Qidong
  • Cao, Huajun
  • Gao, Teng
  • Zhang, Yanbin
  • Yang, Min
  • Lu, Bingheng
  • Yang, Yuying
  • Cui, Xin
  • Zhao, Xufeng
  • Liu, Mingzheng
  • Jia, Dongzhou
  • Zhang, Xiaowei
  • Ma, Hao

Abstract

An intelligent switching system for switching internal cooling and external cooling and a method are provided. The system includes a vision system, a cooling system and a control system. The vision system monitors a real-time milling state of a cutter, collects a real-time milling depth image that the cutter mills a workpiece, and transmits the collected real-time milling depth image to the control system. The control system includes a lubrication mode control center, and a motor control center. The lubrication mode control center receives the real-time image transmitted by the image collection control center; analyzes and processes the real-time image to obtain real-time milling depth data of the cutter. The motor control center receives a signal sent by the lubrication mode control center; analyzes and processes the signal, and transmits a control instruction to the cooling system. The cooling system executes a switching command issued by the control system.

IPC Classes  ?

  • B23C 5/28 - Features relating to lubricating or cooling

3.

Milling system and method under different lubrication conditions

      
Application Number 17468668
Grant Number 11766753
Status In Force
Filing Date 2021-09-07
First Publication Date 2021-12-30
Grant Date 2023-09-26
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • CHONGQING UNIVERSITY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Yin, Qingan
  • Zhang, Yanbin
  • Cao, Huajun
  • Duan, Zhenjing
  • Mao, Cong
  • Ding, Wenfeng
  • Zhang, Naiqing
  • Dong, Lan
  • Bai, Xiufang
  • Sui, Menghua
  • Liu, Yonghong
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

The disclosure provides a milling system and method under different lubrication conditions. The system uses a tool to mill the workpiece, a force measuring system to measure the milling force, a tool change system to replace the tools, a tool storage to store the tools. It can store the tools, provide the lubricating oil to the milling surface, select different tools according to different processing conditions, select the best angle differences of the unequal spiral angle tools according to different conditions comprising dry cutting, casting-type lubrication, minimal quantities of lubrication or minimal quantities of nanofluid lubrication, and/or choose the optimal tool according to different cutting parameters in order to obtain the minimum milling force.

IPC Classes  ?

  • B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B23C 1/06 - Milling machines not designed for particular work or special operations with one vertical working-spindle
  • B23Q 3/155 - Arrangements for automatic insertion or removal of tools
  • B23Q 15/12 - Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
  • B23Q 17/09 - Arrangements for indicating or measuring on machine tools for indicating or measuring cutting pressure or cutting-tool condition, e.g. cutting ability, load on tool

4.

Oil mist recovery, separation and purification device for minimum quantity lubricant grinding process

      
Application Number 17279491
Grant Number 11898699
Status In Force
Filing Date 2020-02-06
First Publication Date 2021-12-16
Grant Date 2024-02-13
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD. (China)
Inventor
  • Li, Changhe
  • Duan, Zhenjing
  • Cao, Huajun
  • Xu, Xuefeng
  • Zhang, Naiqing
  • Dong, Lan
  • Zhang, Yanbin
  • Bai, Xiufang
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

An oil mist recovery, separation and purification device for a minimum quantity lubricant (MQL) grinding process, including: a pneumatic separation mechanism, a pipeline and a fan fixedly connected with one end of the pipeline, wherein the fan is configured to form a negative pressure in the pipeline, one cone-shaped filter mesh mechanism is disposed in the pipeline, and a tip of the cone-shaped filter mesh mechanism faces the side of an air inlet direction of the pipeline; and a filtering and recovery mechanism connected with the pipeline and including a case body, a filtering mechanism and a recovery mechanism, wherein the case body is connected with the pipeline through a connecting part, and the filtering mechanism is connected with the recovery mechanism. The device can separate, recover and reuse oil mist particles in the air.

IPC Classes  ?

  • F16N 7/32 - Mist lubrication
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B24B 55/12 - Devices for exhausting mist of oil or coolantDevices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like
  • F01M 13/04 - Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
  • B01D 45/16 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream
  • F16C 33/66 - Special parts or details in view of lubrication
  • B01D 50/20 - Combinations of devices covered by groups and
  • B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours

5.

METHOD AND SYSTEM FOR INJECTING CUTTING FLUID DURING MILLING UNDER DIFFERENT WORKING CONDITIONS

      
Application Number 17366084
Status Pending
Filing Date 2021-07-02
First Publication Date 2021-10-28
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • CHONGQING UNIVERSITY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Yin, Qingan
  • Cao, Huajun
  • Liu, Yonghong
  • Ding, Wenfeng
  • Zhang, Naiqing
  • Dong, Lan
  • Duan, Zhenjing
  • Zhang, Yanbin
  • Bai, Xiufang
  • Sui, Menghua
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

The disclosure provides a method and system for injecting cutting fluid during milling under different working conditions. By analyzing influence of an airflow field in a milling area under different working conditions on injection of cutting fluid, an influence rule of a helical angle and a rotation speed of a cutter on the flow field is quantitatively analyzed, an optimal target distance of a nozzle, an angle between the nozzle and a milling cutter feeding direction and an angle between the nozzle and the surface of a workpiece are comprehensively determined, the nozzle is set according to a determined setting manner, and lubricating oil is sprayed to the milling area by utilizing the nozzle.

IPC Classes  ?

  • B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools
  • B23C 1/06 - Milling machines not designed for particular work or special operations with one vertical working-spindle
  • B23Q 3/155 - Arrangements for automatic insertion or removal of tools
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work

6.

Device for recovering, separating and purifying oil mist in minimum quantity lubricant grinding process

      
Application Number 16726169
Grant Number 11441729
Status In Force
Filing Date 2019-12-23
First Publication Date 2020-08-06
Grant Date 2022-09-13
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • CHONGQING UNIVERSITY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Duan, Zhenjing
  • Cao, Huajun
  • Xu, Xuefeng
  • Zhang, Naiqing
  • Dong, Lan
  • Zhang, Yanbin
  • Bai, Xiufang
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

The present invention relates to a device for recovering, separating and purifying oil mist in a minimum quantity lubricant (MQL) grinding process, comprising: an air separating mechanism, which comprises a pipeline and a fan fixedly connected with one end of the pipeline, wherein the fan is used for forming negative pressure in the pipeline, at least one conical filter mesh mechanism is arranged in the pipeline, and a tip of the conical filter mesh mechanism faces one side of an air inlet direction of the pipeline; and a filtering and recovering mechanism, which is connected with the pipeline and comprises a tank body, a filtering mechanism and a recovering mechanism, wherein the tank body is connected with the pipeline by a connecting part, and the filtering mechanism is connected with the recovering mechanism.

IPC Classes  ?

  • F01M 1/00 - Pressure lubrication
  • F16N 7/32 - Mist lubrication
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B24B 55/12 - Devices for exhausting mist of oil or coolantDevices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like
  • F01M 13/04 - Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
  • B01D 45/16 - Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream
  • F16C 33/66 - Special parts or details in view of lubrication
  • B01D 50/20 - Combinations of devices covered by groups and

7.

DEVICE FOR RECYCLING, SEPARATING AND PURIFYING OIL MIST DURING MINIMUM QUANTITY LUBRICANT GRINDING AND MACHINING PROCESS

      
Application Number CN2020074390
Publication Number 2020/156583
Status In Force
Filing Date 2020-02-06
Publication Date 2020-08-06
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD. (China)
Inventor
  • Li, Changhe
  • Duan, Zhenjing
  • Cao, Huajun
  • Xu, Xuefeng
  • Zhang, Naiqing
  • Dong, Lan
  • Zhang, Yanbin
  • Bai, Xiufang
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

A device for recycling, separating and purifying oil mist during a minimum quantity lubricant grinding and machining process, comprising: a wind power separation mechanism and a filtering and recycling mechanism, wherein the wind separation mechanism comprises a pipeline and a draught fan (4) which is fixedly connected to one end of the pipeline; the draught fan (4) is used for forming negative pressure in the pipeline; at least one tapered filter net mechanism (5) is provided in the pipeline; the tip of the tapered filter net mechanism (5) faces one side of an air inlet direction of the pipeline; the filter and recycling mechanism is connected to the pipeline and comprises a tank body (9), a filter mechanism and a recycling mechanism; the tank body (9) is connected to the pipeline by means of a connecting part; and the filter mechanism is connected to the recycling mechanism.

IPC Classes  ?

  • B01D 50/00 - Combinations of methods or devices for separating particles from gases or vapours
  • B24B 57/02 - Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents

8.

Milling system and method under different lubrication conditions

      
Application Number 16683550
Grant Number 11161210
Status In Force
Filing Date 2019-11-14
First Publication Date 2020-05-28
Grant Date 2021-11-02
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • CHONGQING UNIVERSITY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Yin, Qingan
  • Zhang, Yanbin
  • Cao, Huajun
  • Duan, Zhenjing
  • Mao, Cong
  • Ding, Wenfeng
  • Zhang, Naiqing
  • Dong, Lan
  • Bai, Xiufang
  • Sui, Menghua
  • Liu, Yonghong
  • Wu, Wentao
  • Gao, Teng
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

The disclosure provides a milling system and method under different lubrication conditions. The system uses a tool to mill the workpiece, a force measuring system to measure the milling force, a tool change system to replace the tools, a tool storage to store the tools. It can store the tools, provide the lubricating oil to the milling surface, select different tools according to different processing conditions, select the best angle differences of the unequal spiral angle tools according to different conditions comprising dry cutting, casting-type lubrication, minimal quantities of lubrication or minimal quantities of nanofluid lubrication, and/or choose the optimal tool according to different cutting parameters in order to obtain the minimum milling force.

IPC Classes  ?

  • B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B23C 1/06 - Milling machines not designed for particular work or special operations with one vertical working-spindle
  • B23Q 15/12 - Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
  • B23Q 17/09 - Arrangements for indicating or measuring on machine tools for indicating or measuring cutting pressure or cutting-tool condition, e.g. cutting ability, load on tool

9.

Milling system and method under different lubrication conditions

      
Application Number 16683605
Grant Number 11084136
Status In Force
Filing Date 2019-11-14
First Publication Date 2020-05-28
Grant Date 2021-08-10
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • CHONGQING UNIVERSITY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Yin, Qingan
  • Cao, Huajun
  • Liu, Yonghong
  • Ding, Wenfeng
  • Zhang, Naiqing
  • Dong, Lan
  • Duan, Zhenjing
  • Zhang, Yanbin
  • Bai, Xiufang
  • Sui, Menghua
  • Wu, Wentao
  • Teng, Gao
  • Yang, Min
  • Jia, Dongzhou
  • Li, Runze
  • Hou, Yali

Abstract

The disclosure provides a method and system for milling injected cutting fluid under different working conditions. By analyzing influence of airflow fields in a milling area under different working conditions on injection of cutting fluid, an influence rule of a helical angle and a rotation speed of a cutter on the flow field is quantitatively analyzed, an optimal target distance of a nozzle, an angle between the nozzle and a milling cutter feeding direction and an angle between the nozzle and the surface of a workpiece are comprehensively determined, the nozzle is set according to a determined setting manner, and lubricating oil is sprayed to the milling area by utilizing the nozzle.

IPC Classes  ?

  • B23Q 3/157 - Arrangements for automatic insertion or removal of tools of rotary tools
  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • B23C 1/06 - Milling machines not designed for particular work or special operations with one vertical working-spindle
  • B23Q 3/155 - Arrangements for automatic insertion or removal of tools

10.

MDOF MICRO-LUBRICATION INTELLIGENT SPRAY HEAD SYSTEM FOR CNC MILLING MACHINE

      
Application Number 16692159
Status Pending
Filing Date 2019-11-22
First Publication Date 2020-03-19
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD (China)
Inventor
  • Li, Changhe
  • Sui, Menghua
  • Wu, Wentao
  • Zhang, Naiqing
  • Wu, Qidong
  • Li, Jun
  • Han, Zhiguang
  • Ji, Heju
  • Gao, Teng
  • Zhang, Yanbin
  • Yang, Min
  • Jia, Dongzhou
  • Yin, Qingan
  • Zhang, Xiaoyang
  • Hou, Yali

Abstract

The present invention discloses an MDOF (multi-degree-of-freedom) micro-lubrication intelligent spray head system for a CNC milling machine, comprising an annular rotating platform, a longitudinal telescopic part, a rotating part, an intelligent spray head mounting platform and an information acquisition system. The annular rotating platform comprises a rotating piece which rotates along a horizontal circumferential direction; a bottom of the rotating piece is connected with at least one longitudinal telescopic part; a lower end of the longitudinal telescopic part is connected with the rotating part; the rotating part rotates within a set angle range by taking a point connected with the longitudinal telescopic part as an axis; the intelligent spray head mounting platform is connected with the rotating part and moves along with the rotating part; and the information acquisition system is mounted on the intelligent spray head mounting platform.

IPC Classes  ?

  • B23Q 11/12 - Arrangements for cooling or lubricating parts of the machine
  • B05B 3/02 - Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements

11.

INTELLIGENT MULTI-DEGREE OF FREEDOM MINIMAL QUANTITY LUBRICATION NOZZLE SYSTEM FOR CNC MILLING MACHINE

      
Application Number CN2018119446
Publication Number 2020/006979
Status In Force
Filing Date 2018-12-06
Publication Date 2020-01-09
Owner
  • QINGDAO UNIVERSITY OF TECHNOLOGY (China)
  • SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD. (China)
Inventor
  • Li, Changhe
  • Sui, Menghua
  • Wu, Wentao
  • Zhang, Naiqing
  • Wu, Qidong
  • Li, Jun
  • Han, Zhiguang
  • Ji, Heju
  • Gao, Teng
  • Zhang, Yanbin
  • Yang, Min
  • Jia, Dongzhou
  • Yin, Qingan
  • Zhang, Xiaoyang
  • Hou, Yali

Abstract

An intelligent multi-degree of freedom minimal quantity lubrication nozzle system for a CNC milling machine, comprising: an annular rotating table, a longitudinal expansion and contraction portion, a rotating portion, an intelligent nozzle mounting base, and an information collecting system. The annular rotating table comprises a rotating member rotating in a horizontal circumferential direction; at least one longitudinal expansion and contraction portion is connected to the bottom of the rotating member; the lower end of the longitudinal expansion and contraction portion is connected to the rotating portion; the rotating portion is rotates within a set angle range around a joint with the longitudinal expansion and contraction portion; the intelligent nozzle mounting base is connected to the rotating portion and moves with the rotating portion; and the information acquisition system is mounted on the intelligent nozzle mounting base. The angle of the nozzle is adjusted reasonably by means of machining data, and the gas-liquid ratio is reasonably configured to ensure that the nozzle can spray the workpiece at a reasonable angle, thereby overcoming the deficiency that the spray angle is limited because the traditional cutting liquid nozzle is fixed, and solving the problems of the dead angle of a cut surface and the waste of the cutting liquid.

IPC Classes  ?

  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work

12.

THREE-PHASE ENERGY-SAVING MINIMUM QUANTITY LUBRICATION AND COOLING SYSTEM BASED ON ELECTROLYZED WATER, OIL, AND AIR

      
Application Number CN2017076185
Publication Number 2017/211102
Status In Force
Filing Date 2017-03-09
Publication Date 2017-12-14
Owner SHANGHAI JINZHAO ENERGY SAVING TECHNOLOGY CO., LTD. (China)
Inventor
  • Wu, Qidong
  • Zhang, Naiqing
  • Li, Changhe
  • Zhang, Yanbin

Abstract

A three-phase energy-saving minimum quantity lubrication and cooling system based on electrolyzed water, oil, and air. The system comprises: an electrolyzed water generator (15), at least one minimum quantity oil-spraying device (2), and at least one oil-water-air mixture spraying device (3). The electrolyzed water generator has a water inlet end connected to an external water source, and an end of an alkaline water outlet (111) connected to the oil-water-air mixture spraying device via a flexible tube. Compressed air is divided into two flows, one is directly connected to the oil-water-air mixture spraying device, and the other is connected to the minimum quantity oil-spraying device to provide a driving power thereto. An oil outlet of the minimum quantity oil-spraying device is connected to the oil-water-air mixture spraying device. The system of the present invention solves the problems in conventional practices of high consumption of a lubricant and severe environmental contamination, and the problems in existing technologies of non-uniform mixing of water and an oil, a poor liquid output effect, and increased labor requirements due to the need to frequently add water.

IPC Classes  ?

  • B23Q 11/10 - Arrangements for cooling or lubricating tools or work
  • C02F 9/04 - Multistep treatment of water, waste water or sewage at least one step being a chemical treatment
  • C02F 9/06 - Electrochemical treatment