Practical aspects, experiences and strategies by using UV/VIS sensors for long-term sewer monitoring

Abstract

An explosion-proof UV/VIS sensor has been available even in sewer systems for some years for simultaneous measurement of COD eq , filtered COD eq , TSS eq and nitrate eq . This sensor allows in-situ real-time measurements with no sampling, no sample preparation and no reagents. Three case studies are presented in this paper using this UV/VIS sensor for longterm sewer monitoring issues whereby two different installation strategies are applied. The pros and cons of both different installation solutions are compared and different calibration results during dry and wet weather conditions and long-term operational sewer monitoring experiences are given in this paper.

Measurement and Control Practices in Finnish Wastewater Networks

“…This new sensor technology offers several advantages compared with classical turbidometry, wet‐chemistry, or UV analyzers (online). The sensors can be installed in situ , as automated cleaning systems are available (Gruber et al, 2006).…”

“…The obtained data show that Finnish municipalities rarely use technologies such as dissolved oxygen or turbidity measurements in sewers, which are the main instruments that have been used elsewhere in Europe in highly instrumented wastewater networks (Gruber et al, 2006). We found that the majority of the Finnish wastewater networks use magnetic flow meters and flow measurements based on the operation time of pumps.…”

A real-time control strategy for separation of highly polluted storm water based on UV–Vis online measurements – from theory to operation

“…Matsché and Stumwoehrer, 1996;Geenens and Thoeye, 1998). In the sewage system, however, considerably more stringent requirements have to be met by measuring equipment and realtime data evaluation, especially if the results form the basis for a P-RTC system (Langeveld et al, 2005;Gruber et al, 2006, Joannis, et al 2008Lacour et al, 2009).…”

“…To achieve a minimum water level to ensure that sound readings are obtained during dry weather periods, a ground sill has been installed about 2 m downstream of the spectrometric probe. In other applications a pontoon system is used to carry the probe (Gruber et al, 2006).…”

“…The P-RTC system design presented above does not (yet) represent a "normal" standard solution. Moreover, every measuring point presents individual requirements (Gruber et al, 2006;Hoppe et al, 2009). Taking all the above-mentioned requirements into account, compared with the alternatives • Channelling of the stream water through a separate channel…”