What is not commonly found in effluent?

Effluent typically contains various pollutants and nutrients resulting from industrial, agricultural, or municipal processes. Common constituents of effluent include chlorine, phosphates, and nitrates.

Chlorine is often used in water treatment processes to disinfect water and is therefore frequently found in effluent, particularly when it has been used to treat wastewater prior to its discharge. Phosphates and nitrates are nutrients that can enter water bodies through agricultural runoff, detergents, and sewage discharge. Their presence in effluent is a significant environmental concern due to their potential to contribute to eutrophication, which leads to harmful algal blooms and deteriorates water quality.

Ammonia trioxide, on the other hand, is not a chemical commonly encountered in effluent. While ammonium and other nitrogen-containing compounds exist in various forms, ammonia trioxide as a specific compound does not typically appear in standard effluent streams. This makes it less relevant in the context of common effluent components, leading to its identification as the correct answer to the question regarding what is not commonly found in effluent.