Delta Treatment Systems • 9125 Comar Drive, Walker, LA 70785 • 1-800-219-9183 • www.deltatreatment.com
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INTRODUCTION
2. System not in use more than three months. Electrical power is
turned off and there are no frost conditions.
• Remove all materials and liquid from tank.
• Refill with clean water.
• Turn off air pump.
3. System not in use more than three months. Electrical power is
on and there are no frost conditions.
• Leave air pump on and system running; OR
• Remove all material and liquid from tank.
• Refill with clean water.
4. System not in use. Electrical power is turned off and there are
frost conditions.
• Remove all material and liquid from tank.
• Turn off air pump.
• If high groundwater is present, fill with clean water.
• If no groundwater is present, leave tank empty.
UNDER NO CIRCUMSTANCES SHOULD THE AIR PUMP BE
TURNED OFF FOR MORE THAN A FEW DAYS WITHOUT
REMOVING TANK CONTENTS
SAMPLING REQUIREMENTS
An ECOPOD-N Fixed Film Wastewater Treatment System
properly operated and maintained should provide the following
effluent quality of:
Biochemical oxygen demand 5 day average (BOD5) of less
than 30 mg/l (or ppm)
Suspended solids of less than 30 mg/l (or ppm)
Volatile
Suspended solids of less than 30 mg/l (or ppm)
pH of 6.0 to 9.0
Dissolved oxygen 1.5 to 3.0 mg/l (or ppm)
Taking Effluent Sample
Samples must be taken in the effluent discharge line or
an effluent pump tank or after the disinfection device. We
recommend allowing the effluent to flow through the discharge
line for a minimum of 4 minutes before taking the sample.
This will allow any solids to be flushed out that might have
accumulated in the discharge pipe. Please see Figure 1 for
reference.
SAMPLES SHOULD BE TAKEN BY A LOCAL
CERTIFIED TESTING LABORATORY. THE
FOLLOWING RECOMMENDED GUIDELINES MAY
BE USED IF LOCAL PROCEDURES ARE NOT
AVAILABLE
.
Grab Samples: If analysis is begun within two hours of
collection, cooling is unnecessary. If analysis is not started
within two hours of sample collection, keep sample at or below
4˚C from the time of collection. Begin analysis within six hours
of collection; when this is not possible because the sampling
site is distant from the laboratory, store at or below 4˚C and
report length and temperature of storage to the lab. In no case,
start analysis more than 24 hours after grab sample collection.
When samples are to be used for regulatory purposes, make
every effort to deliver samples for analysis within six hours of
collection.
1. Biochemical Oxygen Demand (BOD)
Samples for BOD analysis may degrade significantly during
storage between collection and analysis, resulting in low BOD
values. Minimize reduction of BOD by analyzing the sample
promptly or by cooling it to near freezing temperature during
storage. However, even at low temperature, keep the holding
time to a minimum. Warm the chilled samples to 20˚C before
analysis; some storage time can be used to accomplish this
conveniently.
2. Total Suspended Solids (TSS)
Use resistant-glass or plastic bottles, provided that the
material in suspension does not adhere to container
walls. Begin analysis as soon as possible because of the
impracticality of preserving the sample. Refrigerate sample at
4˚C to minimize microbiological decomposition of solids.
3. Ammonia Nitrogen
Most reliable results are obtained from fresh samples.
Destroy residual chlorine immediately after sample collection
to prevent its reaction with ammonia. If prompt analysis is
impossible, preserve samples with 0.8 mL concentration
H2SO4/L sample and store at 4˚C. The pH of the acid-
preserved samples should be between 1.5 and 2. Some
wastewater may require more concentration H2SO4 to achieve
this pH. If acid preservation is used, neutralize samples with
NaOH or KOH immediately before making the determination.
