Precise TOC analysis especially for the WWTP effluent
The QuickTOC®effluent of LAR is an online measuring system for the determination of total carbon (TC), total organic carbon (TOC) and dissolved organic carbon (DOC) according to DIN EN 1484, ISO 8254 and EPA 415.1.
The QuickTOC®effluent is suitable for almost every TOC measurement at the effluent of industrial and municipal waste water treatment plants. Typical on-line applications are the combined effluent monitoring of TOC and TNb in one single analyser. As a result the maintenance efforts will be reduced significantly compared to multiple analysers operation.
Thermal combustion technology
The QuickTOC®effluent has been engineered to work without the aid of expensive catalysts by using temperatures of more than 1200°C. Conventional thermal catalytic methods use temperatures between 680° bis 1000°C.
Therefore, even difficult to combust compounds are oxidised effectively and rapidly, regardless of their composition.
Fast and precise measuring results
The QuickTOC®effluent is designed to operate in a batch mode. Every 2 to 3 minutes the T100 value is measured. This guarantees the precise determination of short and transient peaks throughout the day.
Principle of Operation
The analytical part of the QuickTOC®effluent is a closed system and consists - apart from the well proved and very reliable combustion unit - of a low-maintenance and simple injection system, a robust infrared detector, as well as an industry standard PC with appropriate control and evaluation software. This enables the QuickTOC®effluent to perform precise measurements in the low mg/l (ppm) range.
For the detection of TOC at the effluents of industrial as well as municipal waste water treatment plants the so called TOC direct method or - more precisely - NPOC (Non Purgeable Organic Carbon) method is used. Here, the inorganic carbon is stripped from the sample stream and then, from the remainder, small and well-defined volumes are taken and injected into the carrier gas.
The stream of carrier gas is continually directed through the high temperature combustion oven, where all water contained within the stream is vaporized and all carbon compounds are safely converted to CO2. The carrier gas then transports the CO2 to an infrared detector (NDIR) by which the accrued amount of CO2 is determined. With the parameters obtained, the built-in personal computer (equipped with a customised and user-friendly software) calculates the actual concentration of the TOC in the water.
Various loop volumes are available, with which, together with variable injection frequencies and different injection volumes, the QuickTOC®effluent can be adjusted to different industrial and municipal effluent conditions.
As an option, the QuickTOC®effluent can be equipped to purify ambient air for use as carrier gas, in order to cut costs on bottled gas or instrument air, which then will not be needed.