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CARE AND MAINTENANCE
Under no circumstances should the air pump be turned off
for more than a few days without removing tank contents!
SAMPLING REQUIREMENTS
A Whitewater aerobic treatment plant properly operated and
maintained should provide the following effluent quality of:
Carbonaceous Biochemical Oxygen
Demand 5 day average (CBOD5) of less than 25 mg/l (or ppm)
Total Suspended Solids (TSS) of less than 30 mg/l (or ppm)
Volatile Suspended Solids (VOC) of less than 30 mg/l (or ppm)
pH of 6.0 to 9.0
Dissolved Oxygen (DO) 1.5 to 3.0 mg/l (or ppm)
Taking Effluent Samples
Samples must be taken from the effluent discharge line or an
effluent pump or after the chlorine contact tank. We recommend
allowing the effluent to flow through the discharge pipe for a
minimum of four minutes before taking the sample. This will
allow any solids to be flushed out that might have accumulated
in the discharge pipe. Please find attached drawing of a
Sample Port.
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 6 hours of
collection; when this is not possible because the sampling
site is distant from the laboratory, store at or below 4ºC and
report length and temperature of storage to the lab. Never 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.
Carbonaceous Biochemical Oxygen Demand (CBOD)
Samples for CBOD analysis may degrade significantly during
storage between collection and analysis, resulting in low CBOD
values. Minimize reduction of CBOD 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.
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 4ºC to minimize
microbiological decomposition of solids.
Delta Treatment Systems • 9125 Comar Drive, Walker, LA 70785 • 1-800-219-9183 • www.deltatreatment.com
Ammonia Nitrogen
Most reliable results are obtained on 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 4ºC. 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
beginning the analysis.
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