Exam Study Guide: Sludge Bulking

When operators are faced with licensing exams, they sometimes struggle with test anxiety because they don’t fully understand how to properly study and prepare for exam questions. Here we take a look at a sample wastewater treatment licensing exam question, how to solve the problem, and the correct answer.Sample Question:What is the main difference between primary and secondary clarifiers?a) The density of the sludge handled. b) Number of clarifiers required. c) Flow rate through clarifiers. d) Sludge removal systems.The primary clarifier is designed to remove floatable solids and scum from the surface and settleable solids from the bottom. Solids collected at the bottom