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Quantity accounting of chemical wastewater

Background

Highly alkaline and as well as acidic wastewater, as generated in numerous dying and specialty chemicals factories, must be treated and neutralised before being discharged into watercourses. Due to the significant discharge fees,it is worthwhile for this German chemical plant to measure directly at the wastewater collector line.

The Problem - Aggressive and rough measurement conditions

Mounted ultrasonic transducers


The wastewater is being discharged via subsurface pipes. Because the wastewater is so aggressive, common assembly and sensor materials such as stainless steel and PE are unsuitable at these pH levels. Since other measuring systems break down in these application conditions due to lack of material resistance, the deltawave ultrasonic transducers made from hardened PVC are suitable in all wastewater consistencies tested for chemical
factories.

systec Controls's metering solution

flow measurement for chemical wastewater in open channels, subsurface channels, pipes

Tensioning ring with adjusted transducers


For optimum installation speed and security, even in shafts, the ultrasonic transducers can be
preassembled ex works on a tensioning ring in order to minimise installation work. The tensioning ring adapted to the wastewater pipe can – like a carpet – be rolled up to a really small diameter, thus making transportation to the measuring site and installation in the manhole much easier, even where access is cramped or in conditions where access is only possible with protective equipment (see picture above). The picture on the left shows the mounted ring with adjusted ultrasonic transducers.

The result

Precise monitoring of wastewater quantities creates billing accuracy between the manufacturing
plant and other companies connected to the wastewater system. In addition, measurement avoids expensive overdosing during the purification process, thus protecting the environment and resources.

Technical data

Flume type: subsurface channel (round, 1m)
Medium: chemical wastewater
No. of acoustic paths: 4
Typ of transducers: 1000 kHz
Mounting: Tensioning ring
Levelmeter: Ultrasonic
Typical flow: 500 l/s

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flowmetering of chemical wastewater