PWFS (Flood) Series Systems:
The PWFS (Flood) series systems consist of a
cyclonic sand separator, pump / motor, controls, and an air sparger designed to
treat 60 or 100 gpm of reclaim water. The sand separator will remove down to 70
micron solid particles and is adequate for use in Auto Dealer or Fleet / Flooder
Arch Friction wash applications. When the wash demands water, the system
provides treated water to the wash and recirculates water through the air sparger,
located in the reclaim tank, for odor and biological control. If the wash does not
demand water for 10 minutes, the system will automatically recirculate treated
water back to the reclaim tank through the air sparger for five minutes. This
operation ensures that odor and biological control are performed periodically to
prevent the reclaim tank from going septic. Drawing #1G shows the Process &
Instrumentation Diagram (P&ID) for the PWFS (Flood) series design.
PW 100/200/300-M5 Series Systems:
The PW 100/200/300-5M series systems
consist of high efficiency cyclones, pump / motor, controls and one of three odor
control systems … air sparger, enzyme addition, or ozone addition. The standard
systems are designed to treat 30, 60, and 90 gpm of reclaim water. The new
generation of high efficiency cyclones will remove down to 5 micron solids, so that
the treated water can be used by high pressure touchless or friction in-bay
automatics and tunnel wash applications. The system utilizes a Variable Frequency
Drive (VFD) on the pump motor which is controlled by the wash demand, to vary
the amount of water that is treated and delivered. Water continuously recirculates
back to the reclaim tank, both when water is demanded by the wash and when
there is no demand. Up to three different demand inputs from the wash can be
incorporated into the VFD. The PW 100/200/300-5M system piping also
incorporates a city water intake line for use as: 1) a by-pass to meet wash water
demands in case the system is not operating due to an extremely low level in the
reclaim tank or a fault; and 2) an automatic pump prime operation for system start-
up.
Air Sparger
Biological and odor control are accomplished by using one of three methods,
depending upon the model number supplied. The first method uses an air sparger
(models ending in 5MAS), which is mounted within the reclaim tank above the
water level. The air sparger will bring in air as water is passed through the sparger.
The aerated water will add oxygen to the tank water which will control the
anaerobic bacteria growth. Drawing #2G shows the Process & Instrumentation
Diagram (P&ID) for the Air Sparger Design.
Biological
A second method of control is to add periodically an enzyme that consumes the
organic material in the reclaim water that is used as a food source by the bacteria
(models ending in 5MB). With no food source, the bacteria cannot survive and
multiply. The enzyme is fed into the recirculation water using a small feed pump
that draws from a feed tank. The feed tank is periodically filled with concentrated
enzyme and city water. The recirculation water with enzyme goes through an air
sparger in the reclaim tank to provide aeration and better biological / odor control.
Drawing #3G shows the Process & Instrumentation Diagram (P&ID) for the
Biological Design.
