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Kesar Digum

Composite Wastewater Sampling

Wastewater composition shifts throughout the day - with production shifts, line washdowns and activity peaks. A single grab sample can miss the real picture. Composite sampling, using an automatic composite sampler, collects samples over 24 hours and combines them into a single sample that represents the average flow. Kesar Digum installs the sampler on-site and tests in an ISO 17025 accredited laboratory, nationwide.

Schedule Composite Sampling Call: 08-9332299

At a Glance

Type of SamplingComposite sampling over 24 hours
Sampling MethodTime-proportional or flow-proportional automatic sampler
Required byThe water utilities' monitoring programs
Main AdvantageA representative sample of the average flow
Composite Wastewater Sampling

One sample that represents a full day of wastewater

The wastewater from a plant or treatment facility doesn't flow with a constant composition - it changes between production shifts, line washdowns and activity peaks. A grab sample captures only a single moment and can miss an exceedance or, conversely, present a passing peak as the whole picture. Composite sampling, using an automatic sampler, collects small samples at fixed intervals over 24 hours and combines them into a single sample that reflects the average flow. Kesar Digum installs and operates the sampler on-site and follows through to the results report.

Who this service is for
Industrial plants Food plants Water utilities Treatment plants Industrial zones High-volume wastewater businesses Pretreatment facilities Industrial laundries
What the service includes

What composite sampling involves

Installation, operation and collection with an automatic sampler for a representative sample over time.

Automatic sampler installation

Positioning and installing an automatic sampler at the discharge point, calibrated to collect samples at fixed time intervals.

Time-proportional or flow-proportional sampling

Programming the sampler to collect by time or by flow, according to the nature of the stream and the monitoring program's requirements.

Compositing a representative sample

The individual samples are combined into a single sample that reflects the average flow across the entire day.

Testing against threshold values

The composite sample is tested in an accredited laboratory against the water utility's threshold values, with a clear results report.

Full Details
When to choose composite

When is composite sampling required?

Composite sampling is chosen when a reliable picture of the flow over time is needed, not just a single moment:

A monitoring-program requirement

Water utilities sometimes require composite sampling instead of a grab sample, in order to obtain a faithful representation of the wastewater composition.

Per the utility

A highly variable stream

When the wastewater composition changes throughout the day with shifts and washdowns, composite sampling gives a more accurate picture than a grab sample.

Per flow type

Process control at a treatment plant

For monitoring treatment efficiency and calculating daily loads, a composite sample provides a more reliable basis for decision-making.

Ongoing monitoring

Investigating a persistent exceedance

When grab samples show inconsistent results, composite sampling helps verify whether there is a real exceedance in the stream.

Per event
The risk

What do you miss with a grab sample alone?

When the stream changes throughout the day, a single sample can mislead in either direction:

Missing exceedance peaks

A grab sample taken during a quiet period can miss a load peak that occurs on another shift and leads to an excess-discharge charge.

A distorted picture of the stream

A sample taken during a washdown or an activity peak can present a passing exceedance as if it were the steady state.

A dispute with the utility

Without a representative sample over time, it is hard to contest an excess wastewater charge or to prove compliance with the threshold values.

Schedule Sampling

Need composite wastewater sampling?

We'll install an automatic sampler at the discharge point, carry out composite sampling over 24 hours and return a representative sample with a results report against the threshold values - nationwide.

Schedule Composite Sampling
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