News

Online TOC monitoring of surface water at airports

Especially in winter time, when the planes need to be de-iced, there are a lot of waste water, that is characterized by adhesive (sticky) substances, strongly fluctuating concentrations and a lot of chemicals.

TOC analyzer QuickTOCairport for airport applications

TOC analyzer QuickTOCairport for airport applications

Due to the large sealed surfaces at airports, there are huge amounts of surface water. Especially in winter time, when the planes need to be de-iced, there are a lot of waste water, that is characterized by adhesive (sticky) substances, strongly fluctuating concentrations and a lot of chemicals. The discharge of this polluted water can cause problems in the downstream waste water treatment plants (WWTP). For that reason reliable monitoring is of great importance. The sumparameter TOC was determined as a monitoring parameter in water management at airports. With its determination airport operators can detect quickly high contaminated water, initiate actions against risks and, hence, protect near WWTP's. To provide this, the TOC analysers must be free of memory effects, must offer the TOC value within minutes and must be able to handle strongly fluctuating concentrations.

 

LAR's QuickTOCairport is an application-specific online TOC monitoring system that meets these requirements easily. The QuickTOCairport reliably determines the TOC from the lowest to the highest ranges with the automatic ranging and that in less than three minutes. The analyser uses the catalyst-free thermal combustion at 1,200°C and does not need any sample pre-treatment or dilution.

Moreover, due to its process control, the analyser handles high salt concentrations without clogging and is free of any memory effects. This is realised with the well-designed injection system. Within the QuickTOCairport the amount of wetted surfaces is reduced to a minimum. The use of inert materials as well as a pump, which is installed downstream of the sample stream, prevent carry-over and memory effects caused by absorption and adsorption.

Thus, airport operators are able to monitor the TOC fast, accurately and easily – even in busy winter season.

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