Monitorización de aluminio para tratamiento de aguas residuales

Reliable analysis from high to low concentration ranges

Las sales de aluminio se pueden utilizar en el tratamiento de aguas residuales como agente de coagulación y floculante. Sin embargo, debido a su efecto tóxico en los peces, es importante eliminar el aluminio de manera eficiente antes de que el agua tratada se libere al medio ambiente. Metrohm ofrece una solución para analizar el contenido de aluminio tanto en el floculante según la norma ABNT NBR 11176 recientemente revisada como en el agua tratada antes de la descarga mediante voltamperometría de extracción por adsorción. Esto permite el seguimiento del contenido de aluminio durante todo el proceso de tratamiento de aguas residuales.

Aluminum salts, such as aluminum sulfate and polyaluminum chloride (PAC), are used as coagulation agent and flocculant for treatment of overloaded wastewater. For efficient wastewater treatment, the knowledge of the exact amount of aluminum, expressed as aluminum oxide (Al2O3) in the flocculant, is essential. This can be achieved rapidly and reliably by thermometric titration of the aluminum with sodium fluoride according to the newly revised standard ABNT NBR 11176. To learn more about this analysis, download our Application Note AN-T-224.

Aluminum has a toxic effect on fish in acidic water and must therefore be removed before the release of the treated water into the environment. The European Union stipulates the monitoring of aluminum as an indicator parameter with a maximum content of 200 µg/L. In the United States, the secondary drinking water regulations limit the aluminum content to maximum values of 50–200 µg/L. Adsorptive stripping voltammetry (AdSV) allows the measurement of concentrations as low as 5 µg/L. Compared to atomic absorption spectroscopy (AAS) or Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), voltammetry is a viable alternative with only moderate investment in hardware required and low running costs. To learn more about the method, download our free Application Bulletin AB-131 on this analysis.

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Wastewater treatment