norweco BIO-DYNAMIC LF 1000

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INSTALLATION AND OPERATION MANUAL

FOR MODEL LF 1000, MODEL LF 2000, MODEL LF 3000

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 exibility. The LF Series tablet feeders

consists of ve separate models to accommodate ows

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

ow 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

" 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 ows

from septic tanks; aerobic treatment units; sand lters; rock

reed lters; 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.

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 ow deck where the chemical tablets

are contained in one to three chemical feed tubes. The

number of chemical feed tubes varies by model. The ow

deck has three levels (tiers) which accommodate varying

hydraulic loads and properly

channels liquid to the chemical

tablets. Active chemicals are

released into the ow 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 ow to contact more tablets,

thereby providing the additional

chemical release required for

consistent treatment. As the

ow 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. Certication

requires the use of Norweco

Blue Crystal or Bio-Sanitizer

disinfecting tablets and a chlorine

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 e󰀪uent can be obtained when

the chlorine residual is 0.5 ppm after 15 minutes contact.”

Signicantly greater contact time can decrease disinfection

e󰀩ciency and allow bacteria regrowth.

TABLET FEEDER MODEL LF 1000

BIO-DYNAMIC

DRY CHEMICAL FEEDER

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Summary

Introduction and System Overview

System Application

Outlines gravity flow applications for LF Series tablet feeders in various water treatment systems.

How the LF Series Tablet Feeders Work

Explains the tiered flow deck mechanism and how it adjusts dosing with varying flow rates.

System Performance

Covers NSF/ANSI certification and requirements for effective disinfection with the feeders.

General Installation Instructions

Direct Burial Installation

Detailed steps for burying the tablet feeder below grade, including excavation and backfilling.

Chamber Mounting Brackets

Instructions for connecting the feeder to Schedule 40 PVC piping using appropriate fittings.

Installation at Grade

Guidance on mounting the unit at grade, in-line, or within a contact tank for accessibility.

Direct Burial and Remote Direct Burial

Notes on system fall-through requirements and feeder types for direct burial.

Existing System Retrofit

Advice on integrating feeders into existing water or wastewater treatment systems.

Feeder Design and Operation

Tiered Flow Deck

Describes the multi-tiered flow deck that ensures consistent chemical application across flow variations.

Remote Removal System

Explains the system for safe, remote removal and recharge of feed tubes from grade.

ClearCheck Feed Tube and Cap

Features of the translucent feed tube with twist-lock cap for easy visual inspection.

Filling and Installing the Feed Tube

Step-by-step instructions for safely filling the feed tube with tablets and inserting it correctly.

Chemical Tablet Types and Usage

Bio-Sanitizer Disinfecting Tablets

Information on high-availability chlorine tablets for water and wastewater disinfection.

Bio-Max Dechlorination Tablets

Details on sodium sulfite tablets for neutralizing free and combined chlorine.

Blue Crystal Disinfecting Tablets

Specific disinfecting tablets for residential wastewater with variable flow rates.

Bio-Perc Remediation Tablets

Bioaugmentation tablets designed to rejuvenate failing wastewater treatment systems.

Operational Procedures and Maintenance

Placing the Bio-Dynamic On-Line

Ensures the entire liquid stream passes through the feeder for effective treatment.

Operational Adjustment

Methods for adjusting chemical dosage by rotating the feed tube without stopping operation.

Routine Maintenance

Guidelines for periodic cleaning of feed tubes and feeders with recommended tools.

Intermittent Usage

Recommendations for storing feed tubes during periods of non-use or intermittent system operation.

Safety, Recording, and Warranty

System Safety

Essential safety precautions for personnel working with chemical feed systems.

Chemical Consumption Record

A section for users to document chemical usage and maintenance activities.

Bio-Dynamic Limited Warranty

Explains the comprehensive ten-year limited warranty for LF Series tablet feeders.