wastewater grade 1 exam Latest Update -

wastewater grade 1 exam Latest Update - 100 Questions and 100% Verified Detailed Correct Answers Guaranteed A+ Approved by Professor

1 lb BOD in aeration basin needs .... - CORRECT ANSWER: 1000ft3 of air. More is

needed if oxidation of ammonia is desired.

Acetogenesis - CORRECT ANSWER: Formation of volatile acids

Acid formers - CORRECT ANSWER: Converts part of the complex organic mixture in

the influent sludge stream into volatile acids( organic acids) including acetic, propionic, and butyric acids

Activate sludge treatment plant important aspects of operation - CORRECT ANSWER: Air flow rate( ab do conc), waste activated sludge WAS flow rate, return activated sludge RAS flow rate.

Algae - CORRECT ANSWER: Without light algae use o2 and produce co2. Light only

reaches about three feet depth.

Anaerobic digester auxiliary equipment - CORRECT ANSWER: Access hole,

manometer, sludge sampling manifold, overflow pipe, sight glass, recirculation pump, sludge pumps, sludge density meter.

Anaerobic digester gas - CORRECT ANSWER: 65% methane, 34% carbon dioxide, 1%

other inert gases. Contains less than 1% h2s

Anaerobic digester safety - CORRECT ANSWER: Pressure/vacuum relief valves, flame arrester, drip and sedimentation traps, pressure regulators, thermal valve, waste gas burner. 1 / 2

Anaerobic digestion - CORRECT ANSWER: Stabilization of raw sludge solids is the key.VS, pathogen, and volume reduction and gas production are the process objectives.

Bicarbonate ion HCO3 - CORRECT ANSWER: Healthy digesters have this buffer

BOD - CORRECT ANSWER: Depletion of dissovled oxygen in a sample over 5 days at

20c is measured. Direct measure of the amount of dissolved oxygen consumed by aerobic bacteria over five days, indirect measure of the organic strength of waste water, used to asses the performance of WTP and the unit operations and unit processes used in WTP.

Bod and TSS - CORRECT ANSWER: 24 hr, flow weighted primary influent and primary

effluent composite samples. In mg/l

Buffer - CORRECT ANSWER: Prevents rapid changes in ph. Most buffer in healthy

anaerobic digester is in the form of bicarbonate ion HCO3

Carbon dioxide - CORRECT ANSWER: Aerobic bacteria exhale carbon dioxide.

Anaerobic bacteria produce carbon dioxide. Non flammable, odorless, not toxic but can asphyxiate at high conc, heavier than air.

Chlorine - CORRECT ANSWER: Powerful oxidizing agent. Greenish yellow color,

pungent similar to bleach detectable at .2 to .4 ppm, 2.5 times heavier than air will sink to low points, boiling point is -29.15 f, escaping liquid chlorine will turn into gas immediately, one volume of liquid cl2 converts to 460 volumes of gas. Vaporizes from skin to cause frostbite, not explosive or flammable but can react violently with many substances. Severe irritant, when mixed with water it forms acid, primary route of exposure is eyes and respiratory system.

Chlorine should be separated from... - CORRECT ANSWER: Ammonia and ammonia

compounds, sulfur dioxide, hydrocarbons( oils, greases, solvents, even in small amounts) can can explosions when mixed.

• / 2