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...

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...

Chapter 3—Chemical Reactions MULTIPLE CHOICE 1. Nitroglycerin decomposes violently according to the balanced chemical equation below. 2 C3H5(NO3)3( )  3 N2(g) + 1/2 O2(g) + 6 CO2(g) + 5 H2O(g) Which of the following statements concerning this reaction is/are CORRECT? 1. Two moles of nitroglycerine will produce three moles of nitrogen and five moles of water. 2. Four molecules of nitroglycerine will produced one molecule of oxygen and twelve molecules of carbon dioxide. 3. Six grams...

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...

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...

40 CFR 121- 124 - The federal storm water regulations for the permitting of municipalities and industries. Regulations define storm water terms, permitting, inspecting, and sampling measurements 40 CFR 136 - The regulations for sampling preservation and analyses of water, wastewater, and solid waste 40 CFR 403 - The federal regulations defining the elements of a pretreatment program, prohibited discharges, and the approval process for establishing a pretreatment program Acid - ...

ACS General Chemistry practice 147 Questions with Verified Answers Examples of Lewis-Acid based reactions - CORRECT ANSWER H+(aq) + OH-(aq) →← H2O(l), HCl(g) + NH3(g) → NH4Cl(s) H+(aq) + OH-(aq) →← H2O(l) According to the Lewis definition, an acid is a species - CORRECT ANSWER accepting a pair of electrons. All are potential Lewis bases except - CORRECT ANSWER CH4 Which hydrated metal ion is most acidic under conditions of equal molar concentration in water? - CORRECT ANS...