Shared Flashcard Set

Details

B- activated sludge
wastewater
41
Other
Intermediate
04/12/2019
Click here to study/print these flashcards.

Create your own flash cards! Sign up here.

Additional Other Flashcards

 

 

Cards

Term
In the pure oxygen system,
 Definition
Oxygen is first separated from the air to produce high purity oxygen. (90 to 98%)
Term
The pure oxygen system is
 Definition
a modification of the Activated sludge process. The main difference is the method of supplying dissolved oxygen
Term
Two methods used to Produce Pure Oxygen:
 Definition
The pressure swing adsorption oxygen generating system (PSA), and the Cryogenic air separation method.
Term
PSA Oxygen generating system:
 Definition
Takes air from the atmosphere and compresses it to 30-60psi and cools the compressed air in a water-cooled heat exchanger called an after cooler.
Term
Cryogenic Air separation method:
 Definition
uses low temps (-297 degrees F) to condense oxygen into a liquid to separate it from air.
Term
Explosive or flammable conditons can be present when pure oxygen is mixed with
 Definition
..any hydrocarbon such as gasoline, fuel oil, lubricating oils.
Term
When a considerable amount of liquid oxygen is exposed to the atmosphere, a fog will develop because of
 Definition
water vapor being condensed by the cold oxygen vapor.
Term
When liquid oxygen at atmospheric pressures warms to room temperature,
 Definition
the liquid vaporizes and expands 862 times in volume.
Term
Do not enter an area where the oxygen level is greater than
 Definition
23%
Term
When you set the RAS at a constant rate, At minimum influent flow rates, the MLSS are returned to the aeration tank at a ________ rate then they are flowing INto the clarifier.
 Definition
Higher
Term
When setting the RAS at a constant flow rate, the MLSS will be at a
 Definition
...minimum during Peak flows and a Maximum during Low flows
Term
The most common cause of wastewater toxicity are
 Definition
...excessive amounts of free ammonia, residual chlorine, detergents, paints, solvents, biocides.
Term
Over stabilized organic matter generally produces
 Definition
...fast settling sludge, which may cause high effluent turbidity resulting from pin floc.
Term
Under stabilized organic matter generally results in
 Definition
....sludge that is slow to settle and hard to keep in the clarifer.
Term
The BOD Test measures the
 Definition
...rate of oxygen uptake from the wastewater by microorganisms in biochemical reactions.
Term
Cyanide combines with acid wastes to form the extremely toxic gas
 Definition
HCN
Term
_________________ lack the proper nutrients for healthy microorganism growth and reproduction in the activated sludge process.
 Definition
Industrial wastes
Term
____ is produced by Nitrification.
 Definition
Acid
Term
The advantage of the pure oxygen system is
 Definition
..they require smaller (aeration) reactor tanks.
Term
The reactor vent gas purity valve should be fine tuned when
 Definition
....their is a drastic change in either the quantity or strength of the wastewater entering the plant.
Term
The purpose of the Respiratory Rate Test is to see the
 Definition
...health of microorganisms in the activated sludge.
Term
Filamentous Organisms:
 Definition
Poor settling
Term
The major nutrient concerns in the activated sludge process are
 Definition
Nitrogen and Phosphorous
Term
More nitrogen can be added to wastewater in the form of:
 Definition
Ammonia
Term
More phosphorous can be added to wastewater in the form of:
 Definition
Phosphoric Acid
Term
Bioassay Test:
 Definition
A method of determining toxic effects of industrial wastes using live organisms such as fish.
Term
When brewery wastewaters come in contact with activated sludge organisms,
 Definition
...there is a sudden demand for oxygen by the organisms.
Term
The Major cause of PH fluctuations in dairy plant effluent are
 Definition
...cleaning and sanitizing operations.
Term
Rising Sludge in clarifiers is caused by
 Definition
Denitrification.
Term
The amount of WAS removed affects:
 Definition
Effluent quality, growth rate, settleability, foaming, oxygen consumption.
Term
Calculating the Oxygen Uptake Rate (OUR) can give you a good estimate of:
 Definition
effluent quality, food quality, food strength.
Term
The most common cause of industrial wastewater toxicity is:
 Definition
Biocides ,detergents, free ammonia, and solvents.
Term
Filamentous bulking causes:
 Definition
A lack of nutrients in the influent, changes in organic loading, Low D.O, Low F/M, high levels of sulfer.
Term
To increase PH, add
 Definition
Caustic
Term
To decrease PH, add
 Definition
sulfuric acid.
Term
The main problem caused by nutrient deficiencies when treating dairy processing wastewater is
 Definition
...the development of filamentous
Term
Toxins in dairy plant effluent are:
 Definition
Detergents, lubricants, sanitizers, refrigerants.
Term
High levels of MLSS are necessary to prevent process upsets by
 Definition
...shock organic loadings.
Term
MCRT's as high as 30 days are necessary to treat ____________ in order to maintain the nitrification population necessary to oxidize ammonia.
 Definition
petroleum refinery wastes
Term
To treat a shock load of sulfide, decrease the hydraulic loading and add Soda Ash to the Aeration tank to
 Definition
...reactivate the Phenol-consuming microbes.
Term
The three main petroleum refinery waste compounds that can be treated by the activated sludge process are
 Definition
...Ammonia, phenols, and sulfide.
Supporting users have an ad free experience!