Basic Common Terms And Nouns For Water Treatment

Basic common terms and nouns for water treatment

◆SS: Suspended matter, refers to particulate matter diameter below 0.45um inorganic matter, organic matter, biological, microbial and other pollutants.

◆COD: chemical oxygen demand, refers to the amount of oxidizer consumed when treating water samples with strong oxidizer under certain conditions. COD reflects the degree of pollution by reducing substances in the water, and can reflect the amount of organic matter in the water, reducing substances in the water are organic matter, nitrite, sulfide ferrite salt and so on.

◆CODcr: chemical oxygen demand measured with potassium dichromate as oxidant in a strongly acidic solution.

◆CODmn: Potassium permanganate index, which is the chemical oxygen demand measured by potassium permanganate solution as an oxidant.

◆TOC: Total organic carbon, is a comprehensive index of the total amount of organic matter in water expressed by the content of carbon.

TOD: Total oxygen demand refers to the substances that can be oxidized in water, mainly the oxygen required when organic substances become temperature oxides in combustion, and the result is expressed in mg/L of O2.

◆BOD: Biochemical oxygen demand, refers to the value of aerobic microorganisms in the decomposition of organic matter in water under the condition of dissolved oxygen.

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◆BOD5: five-day biochemical oxygen demand, that is, the change value of dissolved oxygen in water before and after culture for five days at (20±1) ℃.

Nh3-n: Ammonia nitrogen refers to nitrogen in the form of free ammonia (NH3) and free ammonia (NH4+).

◆ Transparency: refers to the transparency of the water sample.

◆ Turbidity: It is the degree of obstruction that occurs when suspended objects in water pass through the light.

◆ Chroma: The dilution method is used to visually compare the sample under test to determine the color intensity of the sample.

◆DO: Dissolved oxygen, oxygen dissolved in the molecular state of water.

◆PH: refers to the negative logarithm of the activity of hydrogen ions in solution. Characterize the acidity and alkalinity of water.

◆SV: sludge settling ratio refers to the percentage of sludge volume in the volume of the mixed liquid after 30 minutes of precipitation in the oxidation tank.

◆SVI: refers to the volume of wet sludge accounted for by 1g dry sludge after 30 minutes of precipitation of the oxidation tank mixture.

◆MLSS: Weight of dry sludge contained in 1 liter oxidation tank sludge mixture. Expressed in mg/L or g/L

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