WasteWater certification exam questions 100% VERIFIED ANSWERS 2024/2025 CORRECT STUDY, Exams of Health sciences

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WasteWater certification

exam questions 100%

VERIFIED ANSWERS

2024/2025 CORRECT STUDY

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The first step in maintenance staff should take in properly locking and tagging out a piece of equipment is to alert the operator on duty When working in an area with two or more floor coverings, be sure that they are always Secured together When manually lifting any object be sure to 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 19.5% What provides safety information for potentially hazardous or toxic materials? MSDS Material safety Data Sheet The threshold limit value concentration for chlorine vapor is 0.5 ppm When working in confined spaces where flammable gases may be present, use only tools made of a non-sparking alloy

In addition to the worker entering a confined space, what is the minimum number of people required to be present during a confined space entry? 1 Hearing protection must be made available to all employees exposed to noise levels above 85 decibels, averaged over 8 working hours Recommended personal hygiene practices to minimize the risk of being infected by wastewater pathogens include changing out of your work clothes and showering before leaving work When using protable electric tools in damp areas or around standing water, be sure to plug them into a ground fault circuit interrupter You are the operator-on-duty. The alarm for the fire detector in the Belt filter press control room goes off. what type of fire extinguisher would you take to respond to this alarm? Class C` In confined space entry, LFL stands for Lower flammability limit When mixing dry sodium hydroxide and water in an enclosed vessel or area, be sure that the vessel or area is properly vented Personnel should not work alone on energized equipment, for example, a magnetic starter, that operates at or above 480 volts. It is considered lethal any amount about this. Which of the following hazardous chemicals in a hydrocarbon? Methane. Phosphoric acid. Sodium hydroxide. Ferric chloride. Methane.

Pulmonary capacity tests are required before operators can be cleared for using respiratory equipment. These tests should be performed at a minimum of once every 3 years According to article 250 of the U.S. National Electric Code (NEC), what color should green wires be? Green. If your 910 kg (1 ton) chlorine cylander is leaking, what type of chlorine institute repair kit should be used? Type A is for 70 kg (150 lbs) Type B is for 1 ton Type C is for rail cars If your facility stores _______ or more chlorine, you must develop a Risk Management Program in compliance with the U.S. EPA's Chemical Accidental Release Prevention Regulations. 1140 kg (2500 lb) Conventional activated sludge systems typically operate with a DO range of 2 - 5 mg/l Large debris (sticks, rocks, ect) large floating solids, and fibrous maters (rags, strings, cloth, etc.) are categorized as Screenings. This material is removed prior to pumps to prevent damage. Pumps are often required to bring wastewater into a treatment plant. What types of pumps are typically used to lift influent wastewater? Centrifugal pumps are primarily used to bring in wastewater, positive displacement pumps are used to transport sludge. The time it takes for a unit volume of wastewater to pass entirely through a primary clarifier is called detention time.

After chlorine, what is the most common effluent wastewater disinfection technique or agent used in the U.S. today? Ultraviolet radiation. Due to fewer safety concerns The BOD loading rate divided by the quantity of microorganism present in the biological reactors (aeration tanks) is known as the food to microorganism ratio (F:M) White fluffy foam on the biological reactors in an activated sludge process is usually caused by Low Dissolved Oxygen Typical components of grit removal systems include chain-and-flight scrapers Daily maintenance procedures for a rectangular secondary clarifier include Inspecting the drive unit and the chain-and-flight system The mechanism used to remove dewatered sludge from the belt of a belt press filter press is commonly referred to as a doctor blade Which of the following terms describes an activated sludge process mode in which aeration and clarification occur in the same tank? Sequencing batch reactor Which type of polymer has the most active product per unit weight? Dry polymer A condition where clear supernatant is pumped through the sludge blanket of a gravity thickener into its underflow is referred to as Coning or "rat holing"

The predominance of which microorganisms is an indication of abnormal activated sludge process operation? fungi At concentrations less that ___ , chlorine gas is not detectable by the human sense of smell 1 ppm or less preliminary treatment the 1st stage of sewage treatment where large debris, such as sticks, grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed enough to allow for sedimentation. primary treatment process used to seperate solid matter that will settle to the bottom or float from waste water being treated. a septic tank is an example. secondary treatment process used to convert dissolved or suspended materials into a form that is easier to seperate. can be biological whereas organisms partially stabilize (oxidize) organic matter Odors occur when treatment becomes Anaerobic What should an operator do before entering a manhole 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 a mechanically raked bar screen What diseases are caused by pathogenic organisms that may be present in raw wastewater?

Hepatitis, typhoid, paratyphoid, dysentery, and cholera What is typically used to dewater sludge? Belt press, Drying beds, solid bowl centrifuge, and gravity thickener Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide and 20 feet deep 269, What is typically used whenever wastewater cannot flow to the treatment plant by gravity Lift station A centrifugal pump must be? or it will not pump Primed One common type of weir design for measuring flow is V-Knotch The operator would need to increase or decrease if the? loading on the plant is high increase/Organic A simple method for indication when to waste sludge is Total sedimentation test Landfill applied sludge must have a solids content of at least? 20% Effluent dosage of chlorine in the contact chamber must produce a total combined residual of? 1.0mg/L after 20 minutes TCEQ allows the reuse of wastewater, some of these uses include irrigation, aquifer recharge, cooling towers and fire protection

Organic solids include organic materials from plant, animals or humans Dangerous gases are produced during bacterial decomposition of organics in wastewater. The main gases are Hydrogen sulfide, carbon dioxide and methane The majority of Dissolved Oxygen in raw sewage come from Potable drinking water Approximately How many pounds does each person contribute of BOD to the system daily

If the operator of a system received a call that a lift station is production of a strong smell of "Rotten eggs" this would be an indication that Hydrogen sulfide gas is present Sources of wastewater include Domestic, Storm water, commercial, food processing, agricultural and industrial A sewer manhole provides access into the system for cleaning or services. A manhole is typically located? At changes in alignment, diameter, grade, direction and intersection Identify the 3 basic types of lift stations Dry, Wet and pneumatic How many feet must new manholes have an inside diameter of? Entry access must be at least how many inches? 4 feet and 30 inches What type of pump most commonly used in a lift station is

Submersible In order to maintain 2 feet per second and velocity in a 6 inch main line, the fall per 100 feet of pipe will be 0.50 percent or 6 inches What is the primary cause of stoppage in a collection system grease and roots What type of gas is very toxic and deadens the sense of? Hydrogen sulfide/smell Inflow and infiltration typically refers to Unaccounted for water in the system after heavy rains