Wastewater Treatment Operator Certification

The first step in maintenance staff should take in properly locking and tagging out a piece of equipment is to - CORRECT ANS alert the operator on duty When working in an area with two or more floor coverings, be sure that they are always - CORRECT ANS Secured together When manually lifting any object be sure to - CORRECT ANS keep it close to your body and use leg strength Oxygen deficiency becomes a concern when the oxygen level in a confined space is less than - CORRECT ANS 19.5% What ...

Surface water runoff, storm water, sanitary and industrial. - CORRECT ANS A collection system that is called "combined" may carry this kind of wastewater: 2 - CORRECT ANS The flow in a collection system should be a minimum of ____ feet per second (FPS)? Solids will settle. - CORRECT ANS What will happen if the flow is too slow in a collection system? Odors, Corrosion, Hydrogen Sulfide Gas (all of the above) - CORRECT ANS A short detention time in the collection system will help prevent wh...

WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? - CORRECT ANS storm events WasteWater Sources & Characteristics: Combined wastewater is defined as - CORRECT ANS sanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: In general, the solids content in wastewater is about - CORRECT ANS 0.1% WasteWater Sources & Characteristics: In general, what is the % of suspend...

Odors occur when treatment becomes - CORRECT ANSWER Anaerobic What should an operator do before entering a manhole - CORRECT ANSWER Test for all hazardous gases and oxygen levels and ventilate the manhole before entering What treatment devices is commonly used to separate and remove large solids from raw wastewater - CORRECT ANSWER a mechanically raked bar screen What diseases are caused by pathogenic organisms that may be present in raw wastewater? - CORRECT ANSWER Hepatitis, typhoid, pa...

1 mg/l is the same as 1 part per billion (ppb) True or False - CORRECT ANS False (v.1 pg 468) A SCADA system is capable of monitoring and controlling equipment from a remote location True or False - CORRECT ANS True (v.2 pg 627) A Discharge Monitoring Report is typically submitted to the regulatory agency on a daily basis True or False - CORRECT ANS False A mechanical seal is used to prevent leaks between the pump casing and shaft. True or False - CORRECT ANS True (v.2 pg 356) Alkalini...

What is the methane content in a properly operation anaerobic digester? A) 30 to 35% by volume B) 1 to 2% by volume C) 65 to 70% by volume D) 15 to 20% by volume - CORRECT ANSWER C) 65 to 70% by volume (v.2 pg 158) What will the addition of chlorine gas do to the pH of wastewater? A) Moderately increase pH B) pH will not be affected C) Significantly increase the pH D) Decrease the pH - CORRECT ANSWER D) Decrease the pH (v.1 pg 349- 350) What is the purpose of a Parshall flume? A) me...

What is the typical BOD removal efficiency in a primary clarifier? A) 10 to 15% B) 40 to 60% C) 20 to 50% D) 95 to 99% - CORRECT ANS C) 20 to 50% (v.1 pg 129) What does the "F" in F/M ratio represent? A) The microorganism population in the aeration tank B) The amount of filamentous bacteria in the activated sludge process C) The MLVSS in the aeration tank D) The food for the microorganisms flowing into the aeration tank, in lbs/day - CORRECT ANS D) The food for the microorganisms flowi...

A continuously flowing watercourse - CORRECT ANS Perennial Stream Algae causes PH to ....... at night - CORRECT ANS Decrease What contributes to creation of algae blooms - CORRECT ANS Increased nutrients Iron is found mostly in what sources of water - CORRECT ANS Groundwater Also called the rule of reasonable sharing - CORRECT ANS Riparian Doctrine Water high in salinity and warm is - CORRECT ANS Low in dissolved oxygen Reservoir turnover - CORRECT ANS Denser water at surface sinking towa...

What is the methane content in a properly operating anaerobic digester? - CORRECT ANS 65 to 70% by volume What will the addition of chlorine gas do to the pH of wastewater? - CORRECT ANS decrease the pH What is the purpose of a Parshall Flume? - CORRECT ANS Measure the flow rate What is the typical removal efficency of settleable solids in a primary clarifier? - CORRECT ANS 95 to 99% Which of the follwing is true about pumoing scum from a primary clarifier? - CORRECT ANS scum causes mor...

What is the methane content in a properly operating anaerobic digester? - CORRECT ANS 65 to 70% by volume What will the addition of chlorine gas do to the pH of wastewater? - CORRECT ANS decrease the pH What is the purpose of a Parshall Flume? - CORRECT ANS Measure the flow rate What is the typical removal efficency of settleable solids in a primary clarifier? - CORRECT ANS 95 to 99% Which of the follwing is true about pumoing scum from a primary clarifier? - CORRECT A...