Dissolved sulfide h2s - Study guides, Class notes & Summaries

If wastewater contains dissolved oxygen, the biological breakdown will reduce sulfate to sulfide. T or F CORRECT ANSWER False At a pH below 5, all sulfide is present in the gaseous h2s form and most of it can be released from wastewater. T or F CORRECT ANSWER True In order to control odors effectively, the operator should know where odors originate and the cause. T or F CORRECT ANSWER True Chlorination is one of the oldest and least effective methods of controlling odors. T or F CO...

SRT - Answer Solids Retention Time. Average time a given unit of cell mass stays in the activated sludge system. SRT is based on solids leaving the Activated Sludge process, and includes solids in the clarifiers. Also called MCRT. SRT Equation - Answer Aeration Total solids inventory/total solids removed from the process Oxygen Uptake Rate - Answer Expressed in mgO2/L/hr High levels suggest either 1. Applied organic load is too high/high F:M 2. The MLVSS concentration is too low/...

wastewater grade 1 exam Treatment updated 20-24/2025 domestic wastewater - CORRECT ANSWER-Comes from schools, homes, hospitals, businesses, light industrial facilities. population equivalents - CORRECT ANSWER-100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day industrial wastewater - CORRECT ANSWER-Comes from industries. Compatible wastes can be processed by the plant. Incompatible wastes are toxic to the plant. sanitary wastewater - CORRECT ANSWER-The combined domestic and indus...

Water Treatment AWWA Questions Grades 1 and 2. Treatment Process Questions and Answers 100% correct What must the effluent NTU for a slow sand filter be kept at during operation? Less than 1.0 NTU When water is added too fast to this treatment chemical, it will generate heat and splattering of the chemical. Sulfuric acid In the lime-softening process, besides CaCO3 being precipitated, what other carbonate hardness chemical is precipitated? Magnesium hydroxide Dry alum ha...

TCEQ Wastewater License Exam Questions With Correct Answers What are the steps of the Water Use Cycle? - answerEnvironment --> Water Treatment --> Water Distribution System --> Customer Use --> Wastewater Collection System --> Wastewater Treatment --> Environment What are the benefits of the collection system? - answer- Removal of health hazards - Prevention of odors and flies - Cleanliness and appearance - Comfort and convenience Septic vs. Fresh wastewater? - answerS...

wastewater grade 1 exam Treatment updated 20-24/2025 domestic wastewater Comes from schools, homes, hospitals, businesses, light industrial facilities. population equivalents 100 lbs wastewater per day, .2 lbs TSS/day, .17 BOD/day industrial wastewater Comes from industries. Compatible wastes can be processed by the plant. Incompatible wastes are toxic to the plant. sanitary wastewater The combined domestic and industrial waste waters from community. storm water Water t...

Microbiology WCC Part 3 with Questions and Answers hemolysis ANSWER to burst or break blood isotomic ANSWER equal concentration of salt inside and outside; no net diffusion of water; it's an equilibrium; human cells want to be this cytoplasm make-up ANSWER 80% is water; 20% is dissolved chemicals (carbohydrates, lipids, proteins), ions (+ and -), and nucleic acids (DNA, RNA); these dissolved chemicals make it gel like ribosomes ANSWER synthesize proteins and are within the cytoplasm...

Describe how a black smoker functions, the flow of seawater, and how the chimney is built. 1) Cold seawater seeps down through cracks into the ocean floor 2) Seawater seep into the ocean crust. Molten rock heats up water to 350-400 degrees C. Water reacts with rocks, removes all oxygen and becomes acidic. Dissolves metals (copper, Iron, zinc) Picks up hydrogen sulfide. 3) Hot fluids rise through the crust. Carries the dissolved metals and Hydrogen sulfide with them. 4) Fluid exit the chi...

Describe how a black smoker functions, the flow of seawater, and how the chimney is built. 1) Cold seawater seeps down through cracks into the ocean floor 2) Seawater seep into the ocean crust. Molten rock heats up water to 350-400 degrees C. Water reacts with rocks, removes all oxygen and becomes acidic. Dissolves metals (copper, Iron, zinc) Picks up hydrogen sulfide. 3) Hot fluids rise through the crust. Carries the dissolved metals and Hydrogen sulfide with them. 4) Fluid exit the chi...

RS- REHS Practice Questions and Answers 100% Accurate What is the most common cause of bacterial meningitis in children under five years of age? a) Neisseria meningitides b) Group B Streptococci c) Streptococcus pneumoniae d) Haemophilus influenzae type B d) Haemophilus influenzae type B How is "giardiasis" usually transmitted to others? a) Person-to-person transfer of cysts from the feces of the infected individual b) Drinking unfiltered water from streams and lakes c) Drinkin...