Objectives and use of results. An industrial waste survey exists to establish, with defensible data, exactly what waste an industry generates — its flow, strength, composition and variability — and to identify where in the process it originates. The results are used to: negotiate or verify sewer-use bylaw compliance and surcharge fees with the receiving municipality; design or upsize an on-site pretreatment or treatment system; identify pollution-prevention and waste-minimization opportunities (source reduction, water reuse); and support a discharge-permit application or renewal with real, representative data rather than assumed design values.
Steps, with reasons:
Review the plant's process flow diagrams and production records. Establishes which unit operations exist and roughly where wastewater originates, so the survey can be targeted rather than a blind, unfocused sampling exercise.
Conduct a site walk-through with plant operations staff. Confirms the as-built layout matches the process drawings (drawings are often outdated) and identifies every actual discharge point, including intermittent or batch dumps that a drawing review alone would miss.
Install flow-measurement devices at each significant discharge point. Quantifies flow rate and its variability over at least one full production cycle, since treatment and conveyance sizing depend on peak as well as average flow.
Design and execute a sampling program (grab and/or flow-proportional composite) matched to each stream's variability. A highly variable batch discharge needs flow-proportional composite sampling to be representative; a steady continuous stream can be adequately characterized with fewer grab samples — matching the method to the stream avoids both wasted effort and unrepresentative data.
Analyze samples for the full relevant parameter list (BOD, COD, TSS, pH, temperature, nutrients, metals, and any process-specific or priority pollutants). Ensures the characterization captures every parameter a downstream permit or treatment design will actually need, rather than requiring a second survey later.
Close a water/material balance across the whole facility. Reconciles measured inputs against measured outputs and flags an unrepresentative sampling period or a missed discharge, which is the single best internal-consistency check on the whole survey.
Compile findings into a survey report with recommendations. Converts the raw data into the decision-ready output the objectives above actually require — a permit submission, a pretreatment design basis, or a waste-minimization business case.
