Differentiate between activated sludge process and trickling bed filter

**Activated Sludge Process:**
The activated sludge process is a widely used biological wastewater treatment method designed to remove organic matter and nutrients from wastewater. It involves the use of microorganisms to break down organic pollutants into stable substances. Here are the key features and characteristics of the activated sludge process:

1. **Process Description:** In the activated sludge process, wastewater is mixed with a culture of microorganisms (activated sludge) in an aeration tank. The microorganisms use the organic pollutants present in the wastewater as their food source and convert them into carbon dioxide, water, and new cell mass.

2. **Aeration:** Aeration is a crucial part of this process. Air or oxygen is continuously ______ ______ _________ ________ __________ ________.
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