CN203405441U - Instrument for detecting COD (chemical oxygen demand) of high-chlorine wastewater on line by basic potassium permanganate method - Google Patents

Instrument for detecting COD (chemical oxygen demand) of high-chlorine wastewater on line by basic potassium permanganate method Download PDF

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Publication number
CN203405441U
CN203405441U CN201320168055.4U CN201320168055U CN203405441U CN 203405441 U CN203405441 U CN 203405441U CN 201320168055 U CN201320168055 U CN 201320168055U CN 203405441 U CN203405441 U CN 203405441U
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cup
unit
way valve
inlet
cod
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姚秀红
刘鸿仪
黄庆发
冷健雄
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JIANGXI ESUN ENVIRONMENT PROTECTION CO., LTD.
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JIANGXI YISHAN ENVIRONMENTAL PROTECTION CO Ltd
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Abstract

The utility model discloses an instrument for detecting COD (chemical oxygen demand) of high-chlorine wastewater on line by a basic potassium permanganate method. The instrument comprises a metering unit (1), a reactor unit (2), a detection unit (3) and an industrial control and data processing and transmitting unit (4). According to the instrument, a sample and a standard reagent, namely an oxidant, are accurately metered through a metering cup, quantitatively added into a decomposing cup of the reactor unit, decomposed for a certain time at a constant temperature, cooled and transferred into a titration cup of the reactor unit, a masking agent is added for masking interfering substances in the sample, and then a reducing agent and acid are added; the whole detection process of data acquiring, analyzing, processing, storing and transmitting is automatically controlled through an industrial control unit PLC (programmable logic controller); the COD value of the sample is calculated, so that COD in a water body can be accurately detected.

Description

A kind of high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method
Technical field
The utility model belongs to environment online measuring technique field, particularly relates to the on-line detector of a kind of high-chloride wastewater COD.
Technical background
Water-quality COD on-line detector is as one of the important monitoring instrument in environmental monitoring field, its detection technique is comparative maturity also, and main know-why has following several: potassium dichromate resolution method, ultraviolet spectroscopy-UV meter, hydroxyl radical free radical (OH) oxidation-electrochemical measurement method, ozone oxidation-electrochemical measurement method and bioanalysis etc.Wherein, only having potassium dichromate method is state specified standards method, and the data that other detection method obtains all need to be converted into CODcr.But the method is all very limited to the antijamming capability of chlorion, is not suitable for the detection of the waste water COD that chloride ion content is very high.
What approach the most with the utility model main technical principle is that standard No. is the national standard of HJ/T 132-2003, and name is called " the mensuration potassium iodide alkaline permanganate method of chemical oxygen demand of high-chloride wastewater ".This standard method is: under alkali condition, with the reducing substances in potassium permanganate oxidation sample, with potassium iodide, reduce excessive potassium permanganate, the iodine generating with sodium thiosulfate titration under acid condition again, according to the potassium permanganate consumption of water sample consumption, calculate the mass concentration of corresponding oxygen, then be converted into CODcr.
The subject matter of the method is, can only be by analyst in laboratory to sample manual analyzing, the real-time online of not realizing such water-quality COD detects automatically.
Utility model content
The defect existing in order to overcome prior art, the purpose of this utility model is to adopt the principles of chemistry of " basic potassium permanganate method ", develops a kind of on-line detector device of the novel water-quality COD that is applicable to high-chloride wastewater.
A kind of high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method of the utility model, be divided into metering units (1), reactor unit (2), detecting unit (3), industry control and data processing and transmission unit (4), it is characterized in that: metering units (1) comprises that metering cup (101) is provided with the first inlet (102), the external fan blower of metering units (1) top design blow vent (104), reactor unit (2) is cleared up cup for water bath with thermostatic control, by interior cup (201) and outer cup (202) two parts, interior cup (201) and outer cup (202) isolation, and be with ground glass stopper, outer cup (202) is provided with water inlet (205) and water delivering orifice (206), reactor unit (2) is connected with four-way valve (207), digestion solution is cooling, react complete, by four-way valve (207), drain into detecting unit (3), detecting unit (3) is titration cup, be provided with the 3rd inlet (301), vs mouth (302), and blow and stir by bottom four-way valve (304), in cup, the electric potential signal of solution reaches industry control unit (4) by the two platinum electrodes (303) that insert in cup, the sample of having analyzed drains into waste liquid barrel through four-way valve.The first inlet (102) is connected with four-way valve, and the grournd glass of interior cup (201) is provided with the second inlet (203) and a spiral exhausr port (204) beyond the Great Wall.
Metering units of the present utility model (1) is by the metering cup of national China Metrology Accreditation, can accurate-metering sample and the consumption of standard reagent, metering cup (101) is provided with the first inlet (102), and expand two inlets by four-way valve (105), the external fan blower of metering units (1) top design blow vent (104), is convenient to liquid and drains into better reactor unit (2).Reactor unit (2) is cleared up cup for water bath with thermostatic control, by interior cup (201) and outer cup (202) two parts.Interior cup (201) and outer cup (202) isolation, and be with ground glass stopper.The grournd glass of interior cup (201) designs the second inlet (203) and a spiral exhausr port (204) beyond the Great Wall.Outer cup (202) is provided with water inlet (205) and water delivering orifice (206), and reactor unit (2) is connected with four-way valve (207), and digestion solution is cooling, react complete, by four-way valve (207), drains into detecting unit (3).Detecting unit (3) is titration cup, is provided with the 3rd inlet (301), vs mouth (302), and blow and stir by bottom four-way valve (304).In cup, the electric potential signal of solution reaches industry control unit (4) by the two platinum electrodes (303) that insert in cup, and the sample of having analyzed drains into waste liquid barrel through four-way valve (304).
High-chloride wastewater COD online automatic detection instrument of the present utility model, has following characteristics, and first is the stable reaction system of clearing up; Second is the interference of getting rid of various inorganic salts; The 3rd is endpoint determination system accurately; The 4th is the science conversion that realizes permanganimetric method and potassium dichromate method mensuration numerical value.Details are as follows for concrete feature.
1, be provided with reactor unit-water bath with thermostatic control and clear up cup.Clear up cup and be divided into outer cup and interior cup, interior cup provides reacting environment, and outer cup provides reaction environment.Without temperature sensor, just can realize thermostatic control, simultaneously after reaction finishes, start cooling water circulation and realize quick cooling digestion solution clearing up.Improve detection efficiency, also save production cost.
2, be provided with new agent prescription, to adapt to different water quality.In testing process, add sulfuric acid acidation, the water quality very high to a lot of salinities is all not suitable for, and most of sulfate is all hard to tolerate or sl. sol., thereby can stop up pipe valve, contaminated electrode.Villaumite is all water-soluble substantially, but the corrosivity that hydrochloric acid volatilization brings is easy to damage instrument components and parts.High-chloride wastewater COD on-line detector of the present utility model adopts the acid mixture of sulfuric acid and hydrochloric acid, when guaranteeing acidity, reduces respectively the concentration of sulfuric acid and hydrochloric acid, solves the problem that instrument stops up and corrodes.
3, the utility model belongs to oxidimetry, and industry control and data processing are judged terminal with the electrode potential hop that transmission unit (4) reacts according to two platinum electrodes, automatically stop titration.Be quick on the draw, control precisely.Circuit control system of the present utility model is stable, reliable, and antijamming capability is strong.
A kind of high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method of the present utility model, sample and standard reagent oxygenant, by jigger accurate-metering, quantitatively join reactor unit and clear up in cup, under constant temperature, clear up certain hour, after cooling, go in reactor unit titration cup, add screening agent to shelter interfering material in sample, then add reductive agent and acid, reduce excessive oxygenant, finally use vs titration, according to the potential jump of solution, judge titration end-point.By industry control unit PLC, realize whole testing process robotization is controlled, data acquisition, analysis, processing, storage and transmission.Calculate the COD value of sample, can detect exactly the chemical oxygen demand (COD) in water body.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is know-why process flow diagram of the present utility model;
Fig. 3 is specimen reaction cellular construction schematic diagram of the present utility model;
Fig. 4 is industrial control system flow chart of data processing figure.
Embodiment
The utility model is pressed the structure shown in figure and is implemented.
Sample through clearing up, uses sodium thiosulfate titration, adopts electrode potential titrimetry, according to reaction system potential break, judge titration end-point, data, through gathering, are converted into the information that PLC can identify and process, calculate the COD value of sample, can detect exactly the chemical oxygen demand (COD) in water body.
Metering units of the present utility model (1) is for by the metering cup of national China Metrology Accreditation, can accurate-metering sample and the consumption of standard reagent, as shown in Figure 3.Metering cup (101) is the active volume of metering cup, be provided with the first inlet (102), liquid enters metering cup (101) through peristaltic pump through the first inlet (102), and expand two inlets by four-way valve (105), each feed tube is arranged to back suction simultaneously, avoid liquid cross pollution.The reagent having more drains into waste liquid barrel through overflow vent (103).The external fan blower of metering units (1) top design blow vent (104), is convenient to liquid and drains into better reactor unit (2).
Sample and oxygenant drain into reactor unit (2) and carry out heating and decompose after metering units (1) accurate measurement.Reactor unit of the present utility model (2) is cleared up cup for the water bath with thermostatic control of designed, designed, and as shown in Figure 3, this cup is divided into interior cup (201) and outer cup (202) two parts.Interior cup (201) is for clearing up reacting environment, and smooth inner wall design, with outer cup (202) isolation, and is with ground glass stopper.The grournd glass of interior cup (201) designs the second inlet (203) beyond the Great Wall, and it is direct, accurate, pollution-free that reagent adds, and a spiral exhausr port (204).Outer cup (202) is provided with water inlet (205) and water delivering orifice (206), clears up and reacts while carrying out, and outer cup (202) provides water bath with thermostatic control condition; Clear up reaction and finish, outer cup (202) provides recirculated water, rapid cooling digestion solution.Reactor unit (2) is connected with four-way valve (207), while clearing up reaction, can be blown and be stirred by external blower pump.
Digestion solution is cooling, react complete, by four-way valve (207), drains into detecting unit (3).Detecting unit of the present utility model (3) is titration cup, as shown in Figure 3, the 3rd inlet (301) of this titration cup design, a vs mouth (302), and blow and stir by bottom four-way valve (304).In cup, the electric potential signal of solution reaches industry control unit (4) by the two platinum electrodes (303) that insert in cup, when current potential generation hop, industry control unit (4) PLC is according to the signal determining terminal that collects and correspondingly stop titration, according to reagent consumption result of calculation, store and transmit.The sample of having analyzed drains into waste liquid barrel through four-way valve (304), handles together.

Claims (2)

1. a high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method, be divided into metering units (1), reactor unit (2), detecting unit (3), industry control and data processing and transmission unit (4), it is characterized in that: metering units (1) comprises that metering cup (101) is provided with the first inlet (102), the external fan blower of metering units (1) top design blow vent (104), reactor unit (2) is cleared up cup for water bath with thermostatic control, by interior cup (201) and outer cup (202) two parts, interior cup (201) and outer cup (202) isolation, and be with ground glass stopper, outer cup (202) is provided with water inlet (205) and water delivering orifice (206), reactor unit (2) is connected with four-way valve (207), digestion solution is cooling, react complete, by four-way valve (207), drain into detecting unit (3), detecting unit (3) is titration cup, be provided with the 3rd inlet (301), vs mouth (302), and blow and stir by bottom four-way valve (304), in cup, the electric potential signal of solution reaches industry control unit (4) by the two platinum electrodes (303) that insert in cup, the sample of having analyzed drains into waste liquid barrel through four-way valve.
2. a kind of high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method as claimed in claim 1, it is characterized in that: the first inlet (102) is connected with four-way valve, the grournd glass of interior cup (201) is provided with the second inlet (203) and a spiral exhausr port (204) beyond the Great Wall.
CN201320168055.4U 2013-04-07 2013-04-07 Instrument for detecting COD (chemical oxygen demand) of high-chlorine wastewater on line by basic potassium permanganate method Active CN203405441U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103777030A (en) * 2014-01-26 2014-05-07 石家庄德润环保科技有限公司 Automatic laboratory chemical oxygen demand analysis device
CN104515769A (en) * 2014-11-27 2015-04-15 宁波大地化工环保有限公司 High chloride wastewater COD (chemical oxygen demand) rapid determination method
CN105403660A (en) * 2015-12-16 2016-03-16 济南海能仪器股份有限公司 Titration reaction apparatus
CN105445411A (en) * 2015-12-16 2016-03-30 山东海能科学仪器有限公司 Kjeldahl apparatus liquid inlet device
CN106525832A (en) * 2016-10-27 2017-03-22 新疆大学 Manganese-chromium two-stage oxidation method for determining COD in high chlorine-containing wastewater
CN109521077A (en) * 2018-11-13 2019-03-26 国电南瑞科技股份有限公司 A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103777030A (en) * 2014-01-26 2014-05-07 石家庄德润环保科技有限公司 Automatic laboratory chemical oxygen demand analysis device
CN103777030B (en) * 2014-01-26 2015-05-27 石家庄德润环保科技有限公司 Automatic laboratory chemical oxygen demand analysis device
CN104515769A (en) * 2014-11-27 2015-04-15 宁波大地化工环保有限公司 High chloride wastewater COD (chemical oxygen demand) rapid determination method
CN104515769B (en) * 2014-11-27 2017-10-20 宁波大地化工环保有限公司 A kind of quick measure high-chloride wastewater COD method
CN105403660A (en) * 2015-12-16 2016-03-16 济南海能仪器股份有限公司 Titration reaction apparatus
CN105445411A (en) * 2015-12-16 2016-03-30 山东海能科学仪器有限公司 Kjeldahl apparatus liquid inlet device
CN105445411B (en) * 2015-12-16 2017-08-08 山东海能科学仪器有限公司 Kjeldahl apparatus feeding device
CN106525832A (en) * 2016-10-27 2017-03-22 新疆大学 Manganese-chromium two-stage oxidation method for determining COD in high chlorine-containing wastewater
CN109521077A (en) * 2018-11-13 2019-03-26 国电南瑞科技股份有限公司 A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device
WO2020098361A1 (en) * 2018-11-13 2020-05-22 国电南瑞科技股份有限公司 Titration end point indicating device for permanganate index on-line analyzer of double platinum electrode type

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C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: JIANGXI ESUN TECHNOLOGY CO., LTD.

Assignor: Jiangxi Yishan Environmental Protection Co.,Ltd.

Contract record no.: 2015360000018

Denomination of utility model: A kind of high-chloride wastewater COD on-line detector that adopts basic potassium permanganate method

Granted publication date: 20140122

License type: Exclusive License

Record date: 20150227

C56 Change in the name or address of the patentee
CP01 Change in the name or title of a patent holder

Address after: 330096 No. 688, hi tech Avenue, Jiangxi, Nanchang

Patentee after: JIANGXI ESUN ENVIRONMENT PROTECTION CO., LTD.

Address before: 330096 No. 688, hi tech Avenue, Jiangxi, Nanchang

Patentee before: Jiangxi Yishan Environmental Protection Co.,Ltd.