Conventional Activated Sludge Process (ASP Technology)

What is the Conventional Activated Sludge Process?

In this process, wastewater is treated in an aeration tank, where air is supplied using surface aerators or blowers. This introduces oxygen into the system, allowing aerobic microorganisms to break down organic pollutants. Over a 12–15 hour retention period, these microbes convert harmful substances into stable, low-energy compounds like nitrates (NO₃), sulfates (SO₄), and carbonates (CO₃).

The treated water then flows into a clarification system, where active microbes are separated and recycled back to the aeration tank. This helps maintain critical performance parameters such as MLSS (Mixed Liquor Suspended Solids) and the F/M (Food-to-Microorganism) ratio, ensuring efficient and consistent treatment performance.

The Conventional Activated Sludge Process (CASP) is one of the most common methods used to treat sewage water.

It uses air and helpful bacteria to break down waste in water—removing bad smells, solids, and pollutants—so the water can be safely released or reused.

Think of it as giving wastewater a "deep clean" using air and biology.