Dive into the 2026 NY Wastewater Exam – Flush Away the Competition with Confidence!

The correct procedure for determining the weight of volatile solids in a Mixed Liquor Suspended Solids (MLSS) sample involves measuring the total solids first, followed by igniting the dried solids at a specific temperature and weighing the remaining ash. This method is essential because it differentiates between the volatile and non-volatile components of the solids.

Initially, total solids are measured through a drying process, where the sample is thoroughly dried to remove moisture content. After drying, the solids are ignited at 550°C, a temperature that ensures the combustion of organic matter while leaving behind inorganic ash. The weight of the remaining ash is then subtracted from the initial weight of the dried total solids. The difference gives the weight of volatile solids, as these are the components that were burned off during ignition.

This method is standard in wastewater treatment analysis because it accurately quantifies the organic matter present, which is critical for assessing treatment efficiency and process performance. By adhering to this specific protocol, the analysis provides reliable data that can be utilized for managing and optimizing wastewater treatment operations.