Cov ntsiab lus oxygen hauv dej tuaj yeem ua kom pom qhov ntsuas dej ntawm tus kheej -purification. Rau cov nroj tsuag kho tsiaj uas siv cov activated sludge, nws yog ib qho tseem ceeb heev kom nkag siab txog cov ntsiab lus oxygen ntawm lub aeration tank. Qhov nce hauv cov pa oxygen hauv cov dej phwj tuaj yuav txhawb nqa cov dej num lom neeg uas tsis yog cov kab mob anaerobic, yog li nws tuaj yeem tshem tawm cov khoom tsis haum thiab oxidation ntuj. ions los ntxuav cov dej phwj tuaj.
Muaj peb txoj hauv kev los txiav txim siab cov ntsiab lus ntawm cov pa oxygen: tsis siv neeg colorimetric tsom xam thiab tshuaj ntsuam xyuas tshuaj, ntsuas paramagnetic, ntsuas electrochemical, thiab fluorescence method. Tus nqi ntawm cov pa oxygen yaj hauv dej feem ntau yog ntsuas los ntawm cov txheej txheem electrochemical.
Oxygen is soluble in water, and the solubility depends on the temperature, the total pressure on the water surface, the partial pressure, and the dissolved salts in the water. The higher the atmospheric pressure, the greater the ability of water to dissolve oxygen, and the relationship is determined by Henry's law and Dalton's law, which states that the solubility of a gas is proportional to its partial pressure.
Lub ntsuas pa oxygen muaj cov cathode (feem ntau ua los ntawm kub thiab platinum) thiab lub txee electrode (nyiaj) nrog tam sim no thiab siv hluav taws xob (nyiaj) tsis muaj tam sim no. Cov electrode yog immersed nyob rau hauv ib tug electrolyte xws li KCl, KOH, thiab lub sensor yog them nrog ib tug diaphragm. Lub membrane cais cov electrode thiab electrolyte los ntawm cov kua los ntsuas, thiab tsuas yog cov roj yaj tuaj yeem nkag mus rau hauv daim nyias nyias, yog li tiv thaiv lub sensor, tiv thaiv ob qho tib si electrolyte los ntawm kev khiav tawm thiab kev nkag mus ntawm cov khoom txawv teb chaws los ntawm kev ua paug thiab lom.
Lub polarizing voltage yog siv los ntawm lub txee electrode thiab cathode. Yog tias lub ntsuas ntsuas tau muab tso rau hauv dej nrog cov pa oxygen, cov pa oxygen diffuses los ntawm lub diaphragm thiab cov pa oxygen molecules uas muaj nyob rau ntawm cathode (cov hluav taws xob ntau dhau) raug txo rau hydroxide ions OH-. Ib qho hluav taws xob sib npaug ntawm cov nyiaj chloride yog precipitated rau ntawm lub txee electrode (tsis muaj electrons), thiab rau txhua tus pa molecule, lub cathode emits 4 electrons thiab lub txee electrode txais electrodes, tsim ib tug tam sim no: 4Ag ntxiv rau 4Cl-=4AgCl ntxiv. 4e -.
Dissolved oxygen detector
Dissolved oxygen detector
The magnitude of the current is proportional to the oxygen partial pressure of the measured sewage. The signal is sent to the transmitter together with the temperature signal measured by the thermal resistance on the sensor, and the difference between the oxygen content stored in the sensor and the oxygen partial pressure and temperature is used. The relationship curve calculates the oxygen content in the water, and then converts it into a standard signal output. The function of the reference electrode is to determine the cathodic potential.
Cov Lux meter Cov khoom txuas Dissolved Oxygen Meter AR8406:
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