ABC Wastewater Collection Level 2 Practice Exam 2026 – Complete Preparation Guide

A trickling filter loaded at a rate of 64 kg BOD5/100m³xd is classified as an intermediate rate filter due to its loading rate, which falls within certain established ranges for trickling filters.

In the context of wastewater treatment, trickling filters are categorized based on their organic loading rates, measured in biological oxygen demand (BOD). Generally, filters are classified into low rate, intermediate rate, and high rate categories based on these loading rates:

- Low rate filters typically have a loading rate of around 10 to 30 kg BOD5/100m³xd.

- Intermediate rate filters have loading rates that generally range from 30 to 70 kg BOD5/100m³xd.

- High rate filters are designed to handle higher organic loading, typically exceeding 70 kg BOD5/100m³xd.

Given that the specified loading rate is 64 kg BOD5/100m³xd, it aligns with the criteria for an intermediate rate filter. This classification is pivotal for understanding the performance expectations and design requirements for the treatment system.