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Water + Waste WaterSafety in waste water treatment facilities
In
addition to specific process areas of a
waste water treatment
facility where a wide range of
intrinsically safe solutions are
required, the water filtration equipment and
the entire waste water treatment plant
itself must be monitored to protect against
corrosive, dusty, dirty, and explosive
atmospheres, in addition to lightning
protection and purge suppression.
Pepperl+Fuchs has a wide range of protection
methods that will keep the waste
water treatment plant safe and
operating effectively.
Safety in wastewater treatment facilities
Corrosion
Prevention, monitoring, and repair are the main contributors to the costs of corrosion on water filtration equipment. It does not include downtime costs. These costs are better controlled when corrosion is viewed as a process variable, rather than a purely historical value or in a complex, scientific method. On-line, real-time monitoring with CorrTran® MV allows immediate changes to be made to the waste water treatment process as corrosion occurs thus reducing the effects of corrosion and cowering operating costs for water filtration.
There are two phenomena that can occur in the typical industrial sewage treatment plant that are induced by lightning, large electrical equipment, and welding equipment: lightning strike and power surges. A lightning protection system consists of external protection, and internal lightning protection. External lightning protection minimizes fire risk by lightning strike and the realization of the Lightning Protection Zones Concept helps to optimize the availability of the installation to a maximum level. A part of the lightning current flows directly to grounding via the earth-termination system. The other part flows via the external supply lines of the sewage treatment plant and could damage the installation. These external supply lines must be furnished with lightning current capable surge protective devices (SPDs). Surge arresters reliably protect the terminal equipment in the waste water treatment facility against conducted transient voltage. Instrumentation in designated areas of the water treatment plant is susceptible to lightning strike or surge. To protect this equipment, water treatment plants install advanced controls using a DCS or PLC system. Damage to the water treatment equipment may result in draining polluted water into the local watersheds, rivers or lakes. Pepperl+Fuchs offers signal conditioning applications that provide isolation and prevent ground loops, thus protecting the water treatment plant. Intrinsic safety Purge |
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