CN109574315A - A kind of PID waste water treatment system - Google Patents

A kind of PID waste water treatment system Download PDF

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Publication number
CN109574315A
CN109574315A CN201811624981.1A CN201811624981A CN109574315A CN 109574315 A CN109574315 A CN 109574315A CN 201811624981 A CN201811624981 A CN 201811624981A CN 109574315 A CN109574315 A CN 109574315A
Authority
CN
China
Prior art keywords
pid
waste water
conditioning tank
pond
heavy metal
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.)
Pending
Application number
CN201811624981.1A
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Chinese (zh)
Inventor
焦伟丽
何辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Sanrenxing Environmental Technology Co Ltd
Original Assignee
Dongguan Sanrenxing Environmental Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongguan Sanrenxing Environmental Technology Co Ltd filed Critical Dongguan Sanrenxing Environmental Technology Co Ltd
Priority to CN201811624981.1A priority Critical patent/CN109574315A/en
Publication of CN109574315A publication Critical patent/CN109574315A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The present invention relates to waste water treatment system technical fields, refer in particular to a kind of PID waste water treatment system, waste water in former pond is pumped into inside conditioning tank by the present invention by elevator pump, PH probe carries out pH value to the waste water inside conditioning tank and checks, the signal that will test is sent in PID controller, PID controller is pumped by acid-base accommodation after being analyzed signal and the acidic or alkaline substances inside acid-base modifier pond is pumped into inside conditioning tank, heavy metal analysis probe detects the tenor inside conditioning tank, it can accurately be controlled being added to the substance inside conditioning tank by PID controller, make the pH value curve relative smooth of adjustment, so that heavy metal precipitator additional amount will not be exceeded, it avoids reagent and secondary pollution caused by excess is added, cost can be effectively reduced, there are also this The PID controller of invention can be programmed, and the standard of pH value and content of beary metal can be adjusted as desired, easy to use.

Description

A kind of PID waste water treatment system
Technical field
The present invention relates to waste water treatment system technical fields, refer in particular to a kind of PID waste water treatment system.
Background technique
Wastewater treatment is to reach the COD in waste water, ammonia nitrogen, phosphorus, heavy metal etc. using physics, chemistry or biological method To discharge standard, in recent years, increasingly raising and the continuous attention of environmental protection consciousness with people to quality of the life, waste water The standard and supervision of discharge are constantly promoted, it is desirable that the harmful substance in waste water must reach the standard that can be discharged, but mesh Preceding waste water treatment system largely carries out processing waste water by the way of manual measurement, is easy to appear in measurement process partially Difference, some handles waste water using mechanical equipment, but during handling can not to the harmful substance in waste water into Row monitoring is easy to appear treatment agent and excessive problem is added, causes the waste of cost, or even a large amount of salts in waste water occur Accumulation.
Summary of the invention
The present invention provides a kind of wastewater treatment convenient to use controlled by PID controller for problem of the prior art System.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of PID waste water treatment system provided by the invention, including former pond, conditioning tank, PH probe, heavy metal analysis are visited Head, acid-base accommodation pump, PID controller, heavy metal precipitator pump, elevator pump, acid-base modifier pond and heavy metal precipitator pond, institute It states former pond and is connected with the conditioning tank by the elevator pump, the PH probe and heavy metal analysis probe are mounted on In the conditioning tank, the PH probe and heavy metal analysis probe are electrically connected with the PID controller, the soda acid Regulator pond is connect by acid-base accommodation pump with the conditioning tank pond, and the heavy metal precipitator pond passes through the heavy metal Precipitating reagent pump is connect with the conditioning tank.
Preferably, the PID controller include PID regulator, analog-digital converter, digital analog converter, digital filter, O controller and feedback signal transmitter, the PID regulator are connected by the digital analog converter and the o controller It connects, the o controller is connected with acid-base accommodation pump, heavy metal precipitator pump respectively, the digital filter One end is connect with the PID regulator, and the other end of the digital filter passes through the analog-digital converter and the feedback letter The connection of number transmitter, the PH probe, heavy metal analysis probe are connect with the feedback signal transmitter respectively.
Preferably, the PID waste water treatment system further includes COD detection probe, ammonia nitrogen detection probe, phosphorus detection spy Head removes COD reagent, removes ammonia nitrogen reagent and dephosphorization reagent, the COD detection probe, the ammonia nitrogen detection probe and institute It states phosphorus detection probe to be electrically connected with the PID controller respectively, the COD detection probe, the ammonia nitrogen detection probe and institute Phosphorus detection probe is stated to be respectively arranged in inside the conditioning tank.
Preferably, including in the acid-base modifier pond includes acid conditioning tank and alkaline conditioning tank, the heavy metal Precipitating reagent pond is equipped with PAM/PAC mixed precipitant, and chlorination hydrogen reagent, the alkalinity conditioning tank are housed inside the acidity conditioning tank Inside is equipped with sodium hydroxide reagent or milk of lime reagent.
Preferably, the PID controller is provided with parameter input panel, there is Self-tuning System in the parameter input panel State switch.
Preferably, the acid-base accommodation pump and heavy metal precipitator pump all have manual adjustment module, the people Work adjustment module is connect with the PID controller.
Preferably, the PID waste water treatment system further includes waste water discharge pond and discharge pump, waste water discharge pond is logical The discharge pump is crossed to connect with the conditioning tank.
Preferably, the adjusting bottom of pond portion is provided with sediment outlet, the sediment outlet is provided with One-way cock.
Preferably, be installed on rabbling mechanism inside the conditioning tank, the rabbling mechanism includes agitating shaft and multiple stirs Stick is mixed, multiple stirring rod are uniformly installed on the agitating shaft.
Preferably, the conditioning tank be provided with it is multiple.
Beneficial effects of the present invention:
A kind of PID waste water treatment system provided by the invention, including former pond, conditioning tank, PH probe, heavy metal analysis are visited Head, acid-base accommodation pump, PID controller, heavy metal precipitator pump, elevator pump, acid-base modifier pond and heavy metal precipitator pond, this Waste water in former pond is pumped into inside conditioning tank by invention by elevator pump, and PH probe carries out PH to the waste water inside conditioning tank Value is checked that the signal that will test is sent in PID controller, and PID controller passes through soda acid after being analyzed signal It adjusts pump the acidic or alkaline substances inside acid-base modifier pond are pumped into inside conditioning tank, heavy metal analysis is popped one's head in adjusting Waste water inside pond carries out content of beary metal and is checked, the signal revolving speed that heavy metal analysis probe will test to PID controller Interior, PID controller is pumped by heavy metal precipitator by the substance pump inside heavy metal precipitator pond after being analyzed signal Enter to conditioning tank, can accurately be controlled being added to the substance inside conditioning tank by PID controller, make adjustment PH value curve relative smooth avoids secondary caused by reagent addition excess so that heavy metal precipitator additional amount will not be exceeded Pollution, can effectively reduce cost, and there are also the preset values inside PID controller of the invention can be programmed and change, and can press The standard of pH value and content of beary metal is adjusted according to demand, it is easy to use.
Detailed description of the invention
Fig. 1 is structure chart of the invention.
Appended drawing reference is respectively as follows:
Former pond -- 1, elevator pump -- 2, conditioning tank -- 3, acid-base accommodation pond -- 4, acid-base accommodation pump -- 5, heavy metal precipitation Agent pond -- 6, heavy metal precipitator pump -- 7, remove COD reagent -- 8, remove ammonia nitrogen reagent -- 9, dephosphorization reagent -- 10, waste water Pond is discharged -- 11, discharge pump -- 12.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to embodiment and attached drawing Bright, the content that embodiment refers to not is limitation of the invention.The present invention is described in detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of PID waste water treatment system provided by the invention, including former pond 1, conditioning tank 3, PH probe, Heavy metal analysis probe, acid-base accommodation pump 5, PID controller, heavy metal precipitator pump 7, elevator pump 2,4 and of acid-base modifier pond Heavy metal precipitator pond 6, the former pond 1 and the conditioning tank 3 are connected by the elevator pump 2, PH probe and described Heavy metal analysis probe is mounted in the conditioning tank 3, PH probe and the heavy metal analysis pop one's head in the PID Controller is electrically connected, and the acid-base modifier pond 4 is connect by acid-base accommodation pump 5 with 3 pond of conditioning tank, described heavy Metal-precipitator pond 6 is connect by heavy metal precipitator pump 7 with the conditioning tank 3, and the present invention passes through elevator pump 2 for raw water Waste water in pond 1 is pumped into inside conditioning tank 3, and PH probe carries out pH value to the waste water inside conditioning tank 3 and checks, will test Signal be sent in PID controller, PID controller signal is analyzed after by acid-base accommodation pump 5 by acid-base accommodation Acidic or alkaline substances inside agent pond 4 are pumped into inside conditioning tank 3, and heavy metal analysis is popped one's head in the waste water inside conditioning tank 3 Content of beary metal is carried out to be checked, in the signal revolving speed to PID controller that heavy metal analysis probe will test, PID controller The substance inside heavy metal precipitator pond 6 is pumped by conditioning tank 3 by heavy metal precipitator pump 7 after signal is analyzed Inside can accurately be controlled being added to the substance inside conditioning tank 3 by PID controller, make the pH value curve of adjustment Relative smooth is more nearly preset value so that heavy metal precipitator additional amount will not be exceeded, avoids reagent and excessive cause is added Secondary pollution, cost can be effectively reduced, can be programmed there are also the preset value inside PID controller of the invention and more Change, the standard of pH value and content of beary metal can be adjusted as desired, it is easy to use.
In the present embodiment, the PID controller includes PID regulator, analog-digital converter, digital analog converter, digital filtering Device, o controller and feedback signal transmitter, the PID regulator pass through the digital analog converter and the o controller Connection, the o controller are connect with acid-base accommodation pump 5, heavy metal precipitator pump 7 respectively, the digital filtering One end of device is connect with the PID regulator, and the other end of the digital filter passes through the analog-digital converter and described anti- The connection of feedback signal transmitter, the PH probe, heavy metal analysis probe are connect with the feedback signal transmitter respectively, PH The signal that probe and heavy metal analysis probe point will test is sent to feedback signal transmitter, and feedback signal transmitter will receive Signal be sent to digital filter after analog-digital converter conversion, the signal for receiving extremely is sent to by digital filter PID regulator, PID regulator send after being compared to the signal received extremely with the numerical value of its internal preset and execute signal, It executes signal and is sent to o controller after digital analog converter conversion, o controller is by pumping 5 Hes to acid-base accommodation Heavy metal precipitator pump 7 is controlled, so that controlling heavy metal precipitator pumps 7 inner materials and 4 inside stream of acid-base modifier pond Enter the flow inside conditioning tank 3, the present invention uses closed-loop control operation, passes through the preset value inside PID regulator and directly inspection The error op of the output valve of survey is controlled, and the ranking operation of proportional action and the differential action is carried out by PID regulator, So that the detected value after adjusting is more nearly preset value, avoids and the problem that excess is added in reagent occur, it is effective to save Cost.
In the present embodiment, the PID waste water treatment system further includes COD detection probe, ammonia nitrogen detection probe, phosphorus detection spy Head removes COD reagent 8, removes ammonia nitrogen reagent 9 and dephosphorization reagent 10, the COD detection probe, the ammonia nitrogen detection probe It is electrically connected respectively with the PID controller with the phosphorus detection probe, the COD detection probe, the ammonia nitrogen detection probe It is respectively arranged in inside the conditioning tank 3 with the phosphorus detection probe, COD detection probe, the ammonia nitrogen detection probe and described The signal that phosphorus detection probe will test respectively is sent to PID controller, is controlled respectively by PID controller except COD reagent 8, except flow and dosage inside conditioning tank 3 is added in the reagent inside ammonia nitrogen reagent 9 and dephosphorization reagent 10, to will adjust The substance containing COD inside pond 3, the substance containing ammonia nitrogen and phosphorous substance carry out precipitating or
Including in the present embodiment, in the acid-base modifier pond 4 includes acid conditioning tank 3 and alkaline conditioning tank 3, described heavy Metal-precipitator pond 6 is equipped with PAM/PAC mixed precipitant, and chlorination hydrogen reagent, the alkalinity are housed inside the acidity conditioning tank 3 Sodium hydroxide reagent or milk of lime reagent are housed, acid conditioning tank 3 can give up the alkalinity inside conditioning tank 3 inside conditioning tank 3 Water is adjusted to neutrality, and similarly the acid waste water inside conditioning tank 3 can be adjusted to neutrality by alkaline conditioning tank 3.
In the present embodiment, the PID controller is provided with parameter input panel, has in the parameter input panel from whole Determine state switch, parameter input panel can be modified preset value, and PID is useless after Self-tuning System state switch is opened Water treatment system can be handled conditioning tank 3 according to the preset value being arranged before.
In the present embodiment, the acid-base accommodation pump 5 and heavy metal precipitator pump 7 all have manual adjustment module, institute It states manual adjustment module to connect with the PID controller, manual adjustment module is used for manual intervention, and operator can be according to demand Manual intervention is carried out to acid-base accommodation pump 5 and heavy metal precipitator pump 7.
In the present embodiment, the PID waste water treatment system further includes waste water discharge pond 11 and discharge pump 12, the waste water row Pond 11 is connect by the discharge pump 12 with the conditioning tank 3 out, will be useless after 3 inter-process of conditioning tank by discharge pump 12 Water is pumped into waste water discharge pond 11 and is stored or be further processed.
In the present embodiment, 3 bottom of conditioning tank is provided with sediment outlet, the sediment outlet setting There is one-way cock, sediment outlet is for excluding the sediment of 3 bottom of conditioning tank, and one-way cock is for closing and beating Open sediment outlet.
In the present embodiment, the accuracy of signal is detected to guarantee that PH probe and heavy metal analysis are popped one's head in, in the conditioning tank 3 Portion is installed on rabbling mechanism, and the rabbling mechanism includes agitating shaft and multiple stirring rod, and multiple stirring rod are uniformly installed on institute It states on agitating shaft, rabbling mechanism also quickly will can be pumped into the reagent inside conditioning tank 3 and the waste water inside conditioning tank 3 carries out Quickly fusion,.
In the present embodiment, the conditioning tank 3 be provided with it is multiple, PID controller can simultaneously multiple conditioning tanks 3 are controlled System, can effectively increase the processing time of waste water.
The above is only present pre-ferred embodiments, is not intended to limit the present invention in any form, although The present invention is disclosed as above with preferred embodiment, and however, it is not intended to limit the invention, any person skilled in the art, It does not depart within the scope of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent change The equivalent embodiment of change, but without departing from the technical solutions of the present invention, technology refers to above embodiments according to the present invention Made any simple modification, equivalent change and modification, belong in the range of technical solution of the present invention.

Claims (10)

1. a kind of PID waste water treatment system, it is characterised in that: pop one's head in including former pond, conditioning tank, PH probe, heavy metal analysis, Acid-base accommodation pump, PID controller, heavy metal precipitator pump, elevator pump, acid-base modifier pond and heavy metal precipitator pond, it is described Former pond is connected with the conditioning tank by the elevator pump, and the PH probe and heavy metal analysis probe are mounted on institute It states in conditioning tank, the PH probe and heavy metal analysis probe are electrically connected with the PID controller, the soda acid tune Section agent pond is connect by acid-base accommodation pump with the conditioning tank pond, and the heavy metal precipitator pond is heavy by the heavy metal Agent pump in shallow lake is connect with the conditioning tank.
2. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the PID controller includes PID Adjuster, analog-digital converter, digital analog converter, digital filter, o controller and feedback signal transmitter, the PID tune Section device is connect by the digital analog converter with the o controller, the o controller respectively with the acid-base accommodation Pump, heavy metal precipitator pump connection, one end of the digital filter are connect with the PID regulator, the number filter The other end of wave device is connect by the analog-digital converter with the feedback signal transmitter, the PH probe, the heavy metal Detection probe is connect with the feedback signal transmitter respectively.
3. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the PID waste water treatment system is also Including COD detection probe, ammonia nitrogen detection probe, phosphorus detection probe, except COD reagent, remove ammonia nitrogen reagent and dephosphorization reagent, The COD detection probe, the ammonia nitrogen detection probe and the phosphorus detection probe are electrically connected with the PID controller respectively, The COD detection probe, the ammonia nitrogen detection probe and the phosphorus detection probe are respectively arranged in inside the conditioning tank.
4. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the acid-base modifier pond Zhong Bao It includes including acid conditioning tank and alkaline conditioning tank, the heavy metal precipitator pond is equipped with PAM/PAC mixed precipitant, the acidity Chlorination hydrogen reagent is housed inside conditioning tank, sodium hydroxide reagent or milk of lime reagent are housed inside the alkalinity conditioning tank.
5. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the PID controller is provided with ginseng Input panel is counted, there is Self-tuning System state switch in the parameter input panel.
6. a kind of PID waste water treatment system according to claim 1, it is characterised in that: acid-base accommodation pump and described Heavy metal precipitator pump all has manual adjustment module, and the manual adjustment module is connect with the PID controller.
7. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the PID waste water treatment system is also Pond and discharge pump is discharged including waste water, the waste water discharge pond is connect by the discharge pump with the conditioning tank.
8. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the adjusting bottom of pond portion is set It is equipped with sediment outlet, the sediment outlet is provided with one-way cock.
9. a kind of PID waste water treatment system according to claim 1, it is characterised in that: be installed on inside the conditioning tank Rabbling mechanism, the rabbling mechanism include agitating shaft and multiple stirring rod, and multiple stirring rod are uniformly installed on the agitating shaft On.
10. a kind of PID waste water treatment system according to claim 1, it is characterised in that: the conditioning tank is provided with more It is a.
CN201811624981.1A 2018-12-28 2018-12-28 A kind of PID waste water treatment system Pending CN109574315A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811624981.1A CN109574315A (en) 2018-12-28 2018-12-28 A kind of PID waste water treatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811624981.1A CN109574315A (en) 2018-12-28 2018-12-28 A kind of PID waste water treatment system

Publications (1)

Publication Number Publication Date
CN109574315A true CN109574315A (en) 2019-04-05

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CN201811624981.1A Pending CN109574315A (en) 2018-12-28 2018-12-28 A kind of PID waste water treatment system

Country Status (1)

Country Link
CN (1) CN109574315A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201560140U (en) * 2009-11-17 2010-08-25 上海依科绿色工程有限公司 PH value intelligent adjusting system for waste water treatment
CN105084589A (en) * 2015-08-06 2015-11-25 中冶华天工程技术有限公司 Treatment method and system for wet magnesium desulphurization wastewater
CN206828249U (en) * 2017-04-14 2018-01-02 广州合昕环境科技有限公司 Integrated sewage water puies forward mark processing equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201560140U (en) * 2009-11-17 2010-08-25 上海依科绿色工程有限公司 PH value intelligent adjusting system for waste water treatment
CN105084589A (en) * 2015-08-06 2015-11-25 中冶华天工程技术有限公司 Treatment method and system for wet magnesium desulphurization wastewater
CN206828249U (en) * 2017-04-14 2018-01-02 广州合昕环境科技有限公司 Integrated sewage water puies forward mark processing equipment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
姚立波: "《工业控制技术及应用》", 30 June 2009, 天津大学出版社 *
谭秉梓: "《给水排水工程施工要点与技术规范全书 第1卷》", 31 March 2002, 吉林科学技术出版社 *

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