norweco BIO-DYNAMIC LF 4600 Installation And Operation Manual

INSTALLATION AND OPERATION MANUAL
INTRODUCTION
Bio-Dynamic LF Series tablet feeders are complete dry
chemical dosing systems for water, wastewater, stormwater
and process water treatment. They are designed to provide
automatic control over the chemical application rate and
maximize installation flexibility. The LF 4000 Series consists
of two models of tablet feeders. The LF 4600 tablet feeder
has six inch inlet and outlet hubs and can handle flows up
to 140 GPM or 200,000 GPD in flow equalized applications.
The LF 4800 tablet feeder has
eight inch inlet and outlet hubs
and can handle flows up to
280 GPM or 400,000 GPD in
flow equalized applications.
Chemical dosage can range from
1 to 50 mg/L, depending upon
the general system component
configuration, daily flow rate and
type of chemical tablets applied.
LF 4000 tablet feeders are
manufactured from durable ABS
and can be glued to schedule 40
PVC piping. Properly installed,
Bio-Dynamic tablet feeders will
provide long term, unattended
operation and precise chemical
application throughout their rated
flow ranges. Please familiarize
yourself with the contents of this
manual before proceeding with
installation and operation.
SYSTEM APPLICATION
Bio-Dynamic LF Series tablet feeders are designed to feed
2 5/8" diameter chemical tablets in gravity flow applications.
These tablet feeders are not to be used for pressurized
applications and must have a gravity outflow. Common
applications for the LF Series tablet feeders are treating
flows from septic tanks; aerobic treatment units; sand
filters; rock reed filters; curtain drains; constructed wetlands;
marine sanitation devices (MSD); individual, community and
municipal drinking water systems; process water systems;
reservoirs; water towers; cooling towers and irrigation
systems. All LF Series Bio-Dynamic tablet feeders can be
installed in-line at or below grade.
FOR MODELS LF 4600 AND LF 4800
BIO-DYNAMIC DRY CHEMICAL FEEDER
®
TABLET FEEDER MODEL LF 4600
HOW THE LF SERIES TABLET FEEDERS WORK
Bio-Dynamic LF 4000 tablet feeders are flow rated
proportional chemical dosing units designed to safely apply
chemicals into the flow of any treatment system. The flow
to be treated enters the tablet feeders through the 6" or
8" integral inlet hub. The liquid then proceeds to the flow
deck where the chemical tablets are contained in one to
four chemical feed tubes. The flow deck has three different
levels (tiers) which accommodate varying hydraulic loading
SYSTEM PERFORMANCE
Bio-Dynamic LF Series tablet feeders are listed as chlorine
disinfection device for secondary effluent from residential
wastewater treatment systems under NSF/ANSI Standard
46 and 385. Certification requires the use of Norweco
Blue Crystal or Bio-Sanitizer disinfecting tablets and a
chlorine contact tank of at least 120 gallons. Contact tank
retention time must comply with the controlling regulatory
jurisdiction. USEPA guidelines state "On the average,
satisfactory disinfection of secondary wastewater effluent
can be obtained when the chlorine residual is 0.5 ppm after
15 minutes contact." Significantly greater contact time can
decrease disinfection efficiency and allow bacteria regrowth.
rates and properly channel liquid
to the chemical tablets. Active
chemicals are released into the
flow stream as the liquid erodes
the tablets. When the incoming
flow rate increases, the liquid
level in the tablet feeder rises to
the next tier of the flow deck. The
increase in liquid level causes
the flow to make contact with
more tablets, thereby providing
the additional chemical release
required for consistent treatment.
As the flow decreases, it
contacts fewer tablets, reducing
the chemical dosage. After
contact with the chemical tablets,
properly treated liquid exits
the tablet feeder through the
6" or 8" outlet hub where a
minimum of 15 minutes contact
time is recommended.