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All About Accuracy

Types of Water: Industrial Waste Water

 

Parameters: TOC, DOC, TNb, COD

All About Accuracy

Title: All About Accuracy

Medium: Hydrocarbon Engineering, Palladin Publicatons UK

Media Issue: 7 / 2016

Types of Water: Industrial Waste Water

Parameters: TOC, DOC, TNb, COD

Content: The continuous total organic carbon (TOC) analysis of industrial wastewater is know to be   problematic - especially when the TOC analyzer is used as a spill monitor for heavily polluted wastewater containing a high load of particles. Thus, most operators require analyzers that enable accurate TOC measurements. But do they really get these? Common analysers suffer from clogging and blockages due to their measuring techniques using tubes and valves. They require pretreatment and/or filtration of the sample. However any pretreatment and/or filtritation will affect the analyzers measuring results. Removing particles means removing carbons and, hence, an inaccurate measurement. Instead of total organic carbon, the analyzer determines only some organic carbon.

The total organic carbon (TOC) is one of the most important sum parameters in the assessment of the organic pollution of water. Since it includes all carbon compounds as one mass, it is exactly defined and an absolute quantity. Therefore, it may be determined directly.

Read more about TOC measurement methods.

Total organic carbon analyzers of LAR Process Analysers AG

The chemical oxygen demand (COD) indicates the amount of oxygen which is needed for the oxidation of all organic substances in water and is thus an important indicator for water analysis. It is considered in the planning and controlling of treatment, as well as assessing its efficiency, thus forming the basis for the calculation of waste water charges.

The COD can be determined in laboratory or online, whereby these methods significantly differ in duration and consumables used.

Read more about COD measurement methods.

COD analyzers of LAR Process Analysers AG

The biochemical oxygen demand (BOD) indicates the amount of oxygen which is needed for the biological degradation of organic substances in water.

Since the generally used BOD5 excludes the nitrification part of the process, this parameter is poorly suited for the control of waste water treatment plants. Alternatively, the total BOD is well-suited, due to the determination of the nitrogen as well as the carbonaceous part of biological degradation.

Read more about the online measurement of BOD.

Toxicity is described as the direct harmful effect of a substance on organisms. These effects can already occur at low concentraions of toxic substances and are dependent on the incubation period and the dosage.

Some test methods that are available on the market can detect toxicity by using fish, daphnia, molluscs, algae or luminous bacteria and testing whether a water sample has a toxic effect on the organisms. They do not, however, identify exactly which toxins are present.

Read more about online toxicity measurements.

BOD / toxicity analyzers of LAR Process Analysers AG

The total nitrogen bound (TNb) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

Read more about online TNb measurements.

The total phosphorus (TP) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.

Read more about online TP measurements.

TN TP analyzer of LAR Process Analysers AG