Wastewater Tougher Questions

Front 1

Six monitoring points of an ASP?

Back 1

Primary Influent, Primary Effluent, Aeration Tank, Secondary Clarifier, Plant Recycles, Plant Effluent

Hint 1

PI, PC, AT, SC, PR, PE

Front 2

Typically the F/M ratio is adjusted by changing the:

Back 2

Sludge Wasting Rate

Front 3

What indicates better sludge settleability?

Back 3

Lower SVI's

Front 4

What should you increase to increase the F/M ratio? increase:

Back 4

Sludge Wasting

Front 5

Name the four typical microorganisms found in the ASP:

Back 5

Bacteria, Protozoa, Rotifiers, Worms

Front 6

In an aeration tank, what D.O. range Is favorable for denitrification in mg/l?

Back 6

0.2-0.5 mg/l

Front 7

The Conventional Activated Sludge Process uses a _____and____ reactor.

Back 7

Plug, Flow

Front 8

Facts: BOD is absorbed and later metabolized, the max organic loading is no more than 60 lbs/1000Ft3/day, Short Detention Times, unsuitable for nitrification, good for high flows, 2 aeration tanks.................................

What process am I?

Back 8

Contact Stabilization

Front 9

Facts: Provides a more uniform distribution of oxygen in the tank, good with shock loads, partial nitrification due to low Detention Times. Primary effluent enters the aeration tank at several points along the length of the tank, rather than at the beginning or head of the tank and flowing through the entire tank in a plug flow mode.......................

...What Process Am I?

Back 9

Step Feed

Front 10

What processes have the longest Aeration time?

Back 10

Extender Aeration, (Oxidation Ditch)

Front 11

What process has a continuous flow around the ring?

Back 11

Oxidation Ditch

Front 12

Facts: Greater hydraulic loading, more stable microbial population, more efficient aeration, a tolerance for shock loads, used for nitrification, sensitive to Ph drops...........

......What process am I?

Back 12

Complete Mix

Front 13

Facts: Reduced sludge age, will perform the best in nitrification, long aeration, long MCRT, low rate loading, high hydraulic retention time (about 24 hours), small to medium communities............................................What process am I?

Back 13

Extended Aeration/Oxidation Ditch (a type of extended aeration)

Front 14

Facts: Nitrogen deficient, high in carbohydrates, poor settling.........................................What process am I?

Back 14

Kraus Process

Front 15

Facts: Deep depths to help with the fill and draw operation, depths of 12-20 Ft, mechanical mixers, can mix with no aeration for nutrient removal and are Single tank. Modified systems are ICEA's that have 2 tanks for continuous flows, This process has periodic inflow and outflow (2 to 6 times a day).What process am I?

Back 15

SBR (Sequencing Batch Reactor)

Front 16

What does PLC stand for?

Back 16

Programmable Logic Controller (used in an SBR)

Front 17

What are the 5 stages of an SBR?

Back 17

Fill, React, Settle, Decant, Idle

Hint 17

F, R, S, D, I

Front 18

Key Words: Aerobic, Autotrophic (CO2 as carbon- oxidize inorganic to live), Nitrosomonas, Nitrobacter, No low Alk, Consumes Alk, Needs D.O., High retention time, Low BOD, ammonia to ammonium, Blue Bay Syndrome, Oxygen added mechanically, Autotrophic bacteria, Lowers Ph, Warm water, MCRT 8 to 20 days,

Back 18

Nitrification

Front 19

Key Words: Anoxic (D.O. <0.3), No D.O., methanol as carbon source, Pseudomonas, Achromobacter, Heterotrophic bacteria (organic carbon to live), acetic acid, facultative bacteria (aerobic or anoxic)

Back 19

Denitrification

Front 20

The same in nature is:

Back 20

Homogenous

Front 21

What word means it can be solid, liquid or gas?

Back 21

Heterogeneous

Front 22

Facts: Air supply is parallel with oxygen demand, Oxygen demand is high at entrance and is low at tail end, Diffused air or surface aerators, Reduces power costs...What am I?

Back 22

Tapered Aeration ASP's

Front 23

Facts: Combo ASP and membrane filtration, no secondary clarifier, Better Effluent quality, a high MLSS can be maintained, expensive, foul odors...What am I?

Back 23

Membrane Bio Reactors (MBR)

Front 24

Facts: Small to medium communities, low O/M cost, modular-compact design, no primary clarifier or anaerobic digester, uses extended aeration, Large A.T.'s, long MCRT's (more than 30 days) What am I?

Back 24

Package Plants

Front 25

_______diffusers are more prone to fouling and require more maintenance.

Back 25

Porous

Front 26

_________ diffusers need less maintenance and can be cleared by bumping the air.

Back 26

Non Porous

Front 27

Fine bubble diffusers usually get porous surface clogging due to ____ and ____.

Back 27

dirt, biological growth

Front 28

Coarse diffusers clog due to ________, or they ______.

Back 28

bio growth, break

Front 29

Some sludge is being removed continuously to be used as _______ sludge in the aeration tanks. The excess sludge must be removed before it loses its activity because of the death of the aerobic organisms resulting from lack of ______ at the bottom of the tank.

Back 29

returned, oxygen

Front 30

___________ is also commonly termed as the solids retention time (SRT) or mean cell residence time (MCRT). Historically, sludge age has been calculated as a "ratio" of the total solids in aeration to the "weight" of total solids in the aeration tank influent.

Back 30

Sludge Age

Front 31

Having a ____ F:M ratio, means you have too many bacteria in your wastewater system relative to the incoming Biochemical Oxygen Demand (BOD). This causes starvation of healthy floc forming bacteria, and issues such as bulking, or high effluent Total Suspended Solids (TSS).

Back 31

Low

Front 32

A ______ F:M ratio means there is a greater quantity of food (measured as BOD, COD, or TOC) relative to the quantity of microorganisms available to consume that food. When the F:M ratio is high, the bacteria are active and multiply rapidly but they are also more dispersed in suspended growth bioreactors.

Back 32

high

Front 33

_________ removes solids buildup in the activated-sludge system, formed when solids amounts in the aeration-tank influent are greater than the solids amounts in the secondary-clarifier effluent. If sludge is not wasted, the secondary clarifier eventually fills up with solids.

Back 33

Wasting

Front 34

What do thick billows of white sudsy foam in your aeration tank indicate? READ THIS

Back 34

High F/M Ratio: Thick billows of white sudsy foam in the aeration tank is often encountered during the start-up of a treatment plant. In this stage, there aren’t many microorganisms in the aeration tank, but there’s plenty of food (BOD) coming in. When you calculate the F/M ratio, you’ll get a larger number because the “F” or food is a big number, while the “M” or microorganism population is fairly small.

Front 35

When _________ is added to wastewater, it decreases the pH because it forms acids when it is mixed with wastewater. Whenever acids are formed in liquid, they will lower the pH, since acids have low pH.

Back 35

Chlorine Gas

Front 36

Another characteristic that’s associated with thick billows of white sudsy foam in the aeration tank is ________, which is a group of microorganisms that hasn’t spent a lot of time in the aeration tank.

Back 36

Young Sludge

Front 37

________are a conventional aerobic biological wastewater treatment unit. Conventional biological treatment means activated sludge systems and fixed film systems such as trickling filters. It is a biological fixed-film treatment process used in the secondary treatment of wastewater following primary treatment. The primary treatment process involves removal of grit, sand and coarse suspended material through a screening process, followed by settling of suspended solids.

Back 37

Rotating Biological Contactor (RBC)

Front 38

Facts: Air supply is parallel with oxygen, oxygen is highest at entrance, oxygen is lowest at the tail end, reduces power costs, is sometimes used to avoid nitrification

Back 38

Tapered Aeration

Front 39

Facts on RAS:

Back 39

The purpose of Return Activated Sludge (RAS) is to prevent loss of microorganisms from the aeration tank and maintain an adequate population for treatment of the wastewater. As microbes metabolize their substrate, they grow and multiply in number. Suspended Solids Insoluble solids that either float on the surface of or are in suspension in wastewater or other liquids. Return Activated Sludge (RAS) Sludge that is recycled between secondary clarifiers and aeration tanks to maintain an active biomass for secondary treatment.

Front 40

Facts on WAS:

Back 40

Some sludge is being removed continuously to be used as returned sludge in the aeration tanks. The excess sludge must be removed before it loses its activity because of the death of the aerobic organisms resulting from lack of oxygen at the bottom of the tank. Wasting removes solids buildup in the activated-sludge system, formed when solids amounts in the aeration-tank influent are greater than the solids amounts in the secondary-clarifier effluent. If sludge is not wasted, the secondary clarifier eventually fills up with solids.

Front 41

_________ - A pure chemical substance that is used in chemical tests to measure, detect, or examine other substances.

Back 41

Reagent

Front 42

________ - A dissolved phase of an element or compound.

Back 42

Soluble

Front 43

________- The dissolved component of a solution.

Back 43

Solute

Front 44

___________ Solution - A solution in which the exact concentration of a chemical or compound is known.

Back 44

Standard