Wastewater Operator Certification Study Guide, Exams of Waste Management

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WasteWater Operator

Certification Study Guide

Grade 1 2024-2025. Questions

and Correct Answers. Graded

A+

Activated Sludge: A primary effluent and returned activated sludge mixture is called - ANSwaste activated sludge Activated Sludge: A yellow gas flame from a digester's waste gas burner may indicate a poor quality gas with a - ANShigh CO2 content Activated Sludge: The main "workers" in the activated sludge process are - ANSbacteria Activated Sludge: The mixture of organisms and solids in water that is removed from the settling tank is called - ANSmixed liquor Activated Sludge: Under normal operating conditions, what color is activated sludge - ANSdark chocolate brown Activated Sludge: What test(s) could an operator use to make process changes immediately if a problem develops - ANSCOD test Basic Chemistry: Describe "colloids" - ANSan ion opposite in charge to a colloidal particle will force its way into the colloidal particle Basic Chemistry: People working in and around wastewater must be immunized for - ANStetanus Basic Chemistry: The electrical potential between two points is measured in - ANSvolts Basic Chemistry: Water is used as a standard because it has unique properties

and is readily available in its pure state. Which standard is not correct? a. Celsius scale b. the calorie c. the kilogram d. specific gravity - ANSthe kilogram Basic Chemistry: What acids are formed when water reacts with nonmetal oxides? a. acid hydroxides b. acid anhydrides c. acid oxides d. acid hydrates - ANSacid anhydrides Basic Chemistry: What is the most common use today for a positive-displacement pump - ANSchemical feed pump Basic Chemistry: What piece of laboratory glassware is primarily used to mix checmicals and measure approximately volumes? - ANSbeaker Basic Chemistry: Which lab glassware is used for measuring volumes - ANSgraduated cylinders Basic Chemistry: Which lab glassware will give the most accurate measurements of liquids - ANSburettes Basic Chemistry: Which lab tests has a zero holding time - ANSchlorine residual Basic Chemistry: Which one of the following is not a hydrate: a. alum b. blue nitrate c. sodium nitrate d. ferrous sulfate - ANSsodium nitrate Basic Chemistry: Which one of the following statements concerning colloids is false? a. solutes have a greater effect on freezing and boiling points of liquids than do colloids b. only very small colloids will pass through a semipermeable membrane c. the average wavelength of white light is smaller than the dimensions of colloidal particles d. dialysis is the separation of colloids from solutes through a semipermeable membrane -

ANSd. dialysis is the separation of colloids from solutes through a semipermeable membrane Basic WasteWater Treatment: Aerobic bacteria will reproduce and live in an environment that contains only - ANSoxygen Basic WasteWater Treatment: An Imhoff cone measures - ANSvolume of settleable solids Basic WasteWater Treatment: Anaerobic bacteria will reproduce and live only in an environment that completely lacks - ANSfree or dissolved oxygen Basic WasteWater Treatment: Once the oxygen is depleted in a natural body of water, which organisms take over? - ANSanaerobic Basic WasteWater Treatment: Scum is usually removed in the _____treatment stage - ANSprimary Basic WasteWater Treatment: Septic conditions are caused by - ANSanaerobic bacteria Basic WasteWater Treatment: The biochemical oxygen demand (BOD) test usually has a specific time of - ANS5 days Basic WasteWater Treatment: The major gas produces by anaerobic decomposition is - ANSmethane Basic WasteWater Treatment: When domestic wastewater enters natural waters, what species deplete most of the oxygen

• ANSaerobic bacteria Disinfection: Free available chlorine consists of - ANSdissolved chlorine gas, hypochlorous acid, and hypochlorite ion Disinfection: How many times heavier than air is chlorine gas? - ANS2.5 times Disinfection: The fusible plug on a chlorine cylinder will start to melt at approximately? - ANS degree F Disinfection: What is the color of liquid chlorine? -

ANSamber... Maintenance: Electromotive force (emf) is also known as - ANSvoltage Maintenance: Electron flow is measure in - ANSamps Maintenance: what type of fuses would most likely be used to protect a meter? - ANSdual-element fuses Odor Control: What would be the most likely solution in the influent to a wastewater treatment plant has an H2S order? - ANSadd treatment chemicals Phosphorus Removal: That is the main reason why wastewater treatment plants remove phosphorous from their effluent before discharging to a lake or river? - ANSthe reduce the growth of algae Preliminary Treatment: In general, what is the water content of screen material - ANS80% Preliminary Treatment: What is the angle of the bards on a mechanically cleaned bar screen - ANS45- degrees Preliminary Treatment: What is the angle of the bars on a manually cleaned bar screen? - ANS30 degrees Preliminary Treatment: What is the ideal wastewater velocity in FPS for grit removal in a grit chamber - ANS1.0 ft/s Preliminary Treatment: What is the ideal wastewater velocity in FPS through a screen channel? - ANS1.5ft/s Preliminary Treatment: What is the wastewater velocity range in FPS for grit removal in a grit chamber? - ANS0.7 - 1.4 ft/s Primary Sedimentation: According to CWA, secondary treatment is defines as a wastewater plant producing an effluent that has no more than____total suspended solids and no more than_____BOD5 - ANS30 mg/L,

30 mg/L Primary Sedimentation: Activated sludge clarifiers accept material to be settled from - ANSan aeration tank Primary Sedimentation: The color of bio film on a rotating Biological Contactor would appear____under normal operating conditions - ANSgray Primary Sedimentation: Typically, what is the average detention time for wastewater in a primary clarifier? - ANS2 hr Racks, screens, comminutors and Grit removal: The bar rack is used - ANSwhen the bar screen is out of service Racks, screens, comminutors and Grit removal: Which one of the following chemicals gives water its greatest capacity to neutralize acids? - ANShydroxide Safety: How far back from the opening of a trench should soil be excavated from that tench be placed - ANS2 ft at least Safety: How many ladders are required to be in a 5-ft deep trench when 6 people are working down the trench - ANS6 ladders Safety: If some clothes are on fire, what class of fire is it? - ANSclass D Safety: If some magnesium is on fire, what class of fire is it? - ANS Safety: In a trench, ladders are required every - ANS25 ft Safety: OSHA requires that adequate protection, such as shoring, be placed in any trench that is - ANS5 ft or greater in depth Safety: The primary purpose of check vales is to prevent - ANSwater from flowing in 2 directions Safety: What class of fire involves electrical equipment? - ANSclass c Safety: What class of fire involves oil and grease? - ANSclass B Safety: What is the

minimum number of people that should be on-site working at a confined space site? where one of them is entering a manhole - ANS3 Safety: What type of fire extinguishers should be in pump stations - ANSA-B-C chemical type Safety: When a permit is required to enter a confined space, who may sign the permit? - ANSentry supervisor Safety: When working in a manhole, your vehicle, whenever possible, should be placed - ANSbetween the manhole and oncoming traffic Safety: which is not an essential ingredient for all ordinary fires? a. ignition source b. fuel c. heat d. oxygen - ANSignition source Safety: Which one of the following gases is least likely to collect in a below-ground vault?

• ANScarbon monoxide Safety: Which one of the following infectious diseases is NOT transmitted by wastewater a. tetanus b. tuberculosis c. AIDS d. polio - ANSthe acquired immune defiency syndrome AIDS virus Safety: Which one of the following is a measure of a materials' opposition to the flow of electric current? - ANSohms Safety: Why is it essential to ventilate a valve before entry - ANSremove dangerous gases Sampling, testing & reporting A test method for determining dissolved oxygen is the______ - ANSazide modification for the Winler titration method Sampling, testing & reporting BOD samples can be preserved by - ANSstoring them in a refrigerator above freezing and up to 4 degrees C Sampling, testing & reporting Generally, the state regulatory body must

be notified for any noncompliance that could adversely affect that state's waters or that could endanger public health within:

• ANS24 hours Sampling, testing & reporting Generally, the state regulatory body must be notified of all unusual or extraordinary discharges by telephone within: - ANS24 hours Sampling, testing & reporting How long can a dissolved oxygen sample wait for analysis using the modified Winkler method, if it is preserved with sulfuric acid? - ANS8 hr Sampling, testing & reporting Tests such as pH, temperature and dissolved oxygen should always be performed within____after collection - ANS min Sampling, testing & reporting The maximum holding time for a preserved total suspended solids sample is: - ANS7 days Sampling, testing & reporting The maximum holding time for preserved BOD5 samples is - ANS2 days Sampling, testing & reporting When calibrating a pH meter, the buffers used should bracket the expected pH and ______ - ANSbe at least 2 pH units apart Sampling, testing & reporting Which one fo the following tests is least likely to effectively help an operator control a waste plant's process? - ANSBOD 5 Sedimentation and Flotation: Name one gas this irritates the "eyes" - ANSchlorine Waste Treatment Ponds: Ponds used in series after primary wastewater treatment are sometimes called - ANSoxidation ponds Waste Treatment Ponds: The most common type of pond is - ANSfacultative pond Waste Treatment Ponds: When is

the Dissolved Oxygen in a waste pond the lowest? - ANSsunrise Waste Treatment Ponds: Which one of the following nuisance organisms is controller simply by the water surface being disturbed by wind or currents? - ANSmosquitoes Wastewater Solids Processing: The solids treatment method produces methane gas that can be used in other plant processes: - ANSanaerobic digestion Wastewater Solids Processing: The solids treatment method uses a partially submerged rotating drum - ANSvacuum filter Wastewater Solids Processing: The solids treatment method uses evaporation but also requires a great deal of labor. - ANSsand drying beds Wastewater Solids Processing: The solids treatment methods processes solids in a sealed unit: - ANSanaerobic digestion Wastewater Solids Processing: These solid treatment methods use a coagulant polymer and pressure - ANSbelt filter and plate Wastewater Solids Processing: This solids retention treatment method usually has 20 days of retention time: - ANSaerobic digestion Wastewater Solids Processing: This solids treatment method cures the final product and then it may be applied to farmlands

• ANScomposting WasteWater Sources & Characteristics: Combined wastewater is defined as - ANSsanitary wastewater and stormwater runoff WasteWater Sources & Characteristics: Generally, the % of dissolved solids in the amount of total solids is about - ANS70% WasteWater Sources & Characteristics: In

general, the solids content in wastewater is about - ANS0.1% WasteWater Sources & Characteristics: In general, what is the % of suspended solids in the total amount of solids - ANS30% WasteWater Sources & Characteristics: What is the most common reason for a wastewater to contain intermittent large amounts of sand, gravel, and grit? - ANSstorm events WasteWater Sources & Characteristics: Which type of organisms would most probably be associated with poor treatment or young biomass - ANSamoebas WasteWater Sources & Characteristics: Which type of organisms would most probably be associated with very clear plant effluent. low BOD and low amounts of suspended solids - ANSstalked cilates Wastewater Treatment Facilities: A pond that has an aerobic top layer and an anaerobic bottom layer is called - ANSa facultative pond Wastewater Treatment Facilities: A pond that is used to treat raw wastewater is called - ANSa waste stabilization pond Wastewater Treatment Facilities: Another name for promary treatment is - ANSsedimentation Wastewater Treatment Facilities: Digester gas is_______when mixed with air the the proper proportions - ANSextremely explosive