norweco BIO-DYNAMIC LF 1000 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 Series tablet feeders
consists of five separate models to accommodate flows
ranging from less than 100 GPD through 400,000 GPD
and chemical dosage ranging
from 1 to 50 mg/L, depending
upon the general component
configuration, daily flow rate
and the type of chemical tablets
applied. All models of LF Series
tablet feeders are manufactured
from durable ABS and can be
glued to Schedule 40 PVC piping.
When properly installed, the
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 / " diameter chemical tablets
5
8
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 tablet feeders can be installed at
grade, in-line or below grade.
FOR MODEL LF 1000, MODEL LF 2000, MODEL LF 3000
BIO-DYNAMIC
TABLET FEEDER MODEL LF 1000

HOW THE LF SERIES TABLET FEEDERS WORK

Bio-Dynamic LF Series tablet feeders are flow rated
proportional chemical dosing units. Flow to be treated enters
the tablet feeders through the 4" integral inlet hub. The liquid
then proceeds to the flow deck where the chemical tablets
are contained in one to three chemical feed tubes. The
number of chemical feed tubes varies by model. The flow
deck has three levels (tiers) which accommodate varying
DRY CHEMICAL FEEDER
®
contact tank of at least 60 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.
hydraulic loads and properly
channels 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. The
increase in liquid level causes
the flow to contact 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 4" outlet hub.

SYSTEM PERFORMANCE

Bio-Dynamic LF Series tablet
feeders are listed as a disinfection
device for secondary effluent
from residential wastewater
treatment systems under NSF/
ANSI Standard 46. Certification
requires the use of Norweco
Blue Crystal or Bio-Sanitizer
disinfecting tablets and a chlorine