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Flashcards in Wastewater Engineering 2 Deck (115)
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1

It is the modification of of conventional plug-flow process

Tapered Aeration

2

Settled wastewater is introduced at several points in the aeration tank to equalize Food:Microbe ration, thus lowering the peak oxygen demand and peak hydraulic loads

Step Aeration

3

Identical with conventional or tapered aeration, but uses shorter aeration times (1.5 to 4 hours) and higher F:M ratios are used

Modified Aeration

4

Uses two separate tanks or compartments for the treatment of ww and stabilization of the activated sludge

Contact Stabilization

5

Process is used extensively for prefabricated package plants for small communities. No primary sedimentation

Extended Aeration

6

Process modification in which high MLSS concentrations are combined w/ high volumetric loadings. Uses turbine mixers for adequate mixing in the reactor

High Rate Aeration

7

It is an extended aeration process consists of a ring or oval shaped channel and is equipped w/ mechanical aeration devices

Oxidation Ditch (Racing Track)

8

Aerating the supernatant from the sludge digesters, digested sludge and a portion of RAS in a separate reaeration tank approx 24 hrs converting NH3 to NO3

Krauss Process

9

Vertically mounted mechanical aerators are used to impart oxygen and to provide sufficient horizontal velocity to the liquids to prevent settling of solids in aeration channel

Carroussel Process

10

Pure oxygen is used as a substitute for air in the activated sludge process

High purity oxygen

11

It is a "fill and draw" activated sludge process for wastewater treatment system. In this system, wastewater is added in single "batch" reactor, treated to removed undesirable components and then discharged

Sequential Batch Reactor (SBR)

12

Utilizes a solid medium on which bacterial solids are accumulated in order to maintain a high population

Attached Growth Process

13

They are no longer used by large communities because of the extensive area required

Intermittent Sand Filter

14

Consist if a bed of highly permeable media to w/c are attached and through w/c wastewater is percolated or trickled

Trickling Filter

15

It is used for loadings less than 40 kg BOD5 / m3 per day

Low rate filters

16

It is used for loadings up to 50 BOD5 / 100 m3 per day

Intermediate-rate Filters

17

Used for loadings up to 480 kg BOD5 / m3 per day

High rate filters

18

it is used for loadings more than 160 BOD5 / 100m3 per day

Roughing Filters

19

the surface of the disk is covered with a biological slime similar to that on the media of a trickling filter

Rotating Biological Contractors (RBC)

20

In a fixed-bed reactor the catalyst pellets are held in place and do not move with respect to a fixed reference frame

Packed bed reactor

21

The solids formed when microorganisms are used to treat wastewater. it includes organisms, accumulated food materials, and waste products from the aerobic decomposition process

Activated Sludge

22

It is to produce an extremely high quality discharge

Advanced waste Treatment

23

The only source of oxygen is combined oxygen is combined oxygen such as that found in nitrate compounds

Anoxic

24

Solid organic matter recovered from a sewage treatment process and used especially as fertilizer

Biosolids

25

A substance or solution which resists changes in pH

Buffer

26

The theoretical time water remains in a tank at a given flow rate

Detention time

27

The removal or separation of a portion of water present in a sludge or slurry

Dewatering

28

The monthly report required by the treatment plant's National Pollutant Discharge Elimination System (NPDES) discharge permit

Discharge Monitor Report

29

An activated sludge process control calculation based upon the amount of food available per pound of mixed liquor volatile suspended solids

Food-to-microorganism ratio

30

Heavy inorganic solids such as sand, gravel, egg shells, or metal fillings

Grit