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Nitrificants toximeter for WWTP protection

The toximeter NitriTox of LAR Process Analysers AG is a continuous operating analyzer for the determination of nitrification toxicity.

toxicity analyzer NitriTox

The toximeter NitriTox determines the toxicity within 5-10 min

 

The toximeter NitriTox of LAR Process Analysers AG is a continuous operating analyzer for the determination of nitrification toxicity. Especially in water treatment, toxic substances can harm the waste water treatment plant's biomass in a negative way and in worst case lead to a entire plant shutdown. Therefore, the monitoring of toxicity is of special importance.

The toximeter monitors the oxygen consumption of the bacteria used by means of a nitrification respiration inhibition test and thus, determines the toxicity. For that purpose, NitriTox contains a bacteria culture (nitrifiers), which constantly and independently produces biomass. This means that the risk of the test organisms being contaminated within the analyzer is avoided, as every water sample is tested with a small and fresh amount of bacteria. In contrast to alternative toxicity tests, purchasing or time consuming breeding of test organisms is not necessary anymore. The used subset of nitrifiers is brought into contact with the waste water and then, they consume oxygen from the conversion of ammonia to nitrate. LAR's toximeter measures this oxygen consumption. Toxic substances in the sample inhibit the respiration of the bacteria, thus lowering their oxygen consumption. The NitriTox monitors this oxygen consumption and hence the toxicity. Depending on the application, the measurement results are available in 5-10 min. Hence, operators can take countermeasures, in case of a toxic load, to protect the biology of the waste water treatment plant effectively.

 

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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