en CR Wastewater Treatment Terminology 33 Activated Sludge: Accumulating solid matter produced by growing microorganisms in aeration tanks Activated Sludge Process: Secondary wastewater treatment process using air and bacteria to speed up decomposition of waste Advanced Treatment: Additional treatment done to wastewater beyond secondary treatment Aeration: The process of adding air Aeration Tank: Tank where settled wastewater is mixed with activated sludge and aerated Aerobic: Life or natural processes that requires oxygen Anaerobic: Life processes that does not need oxygen Bacteria: Single-celled organisms Baffle: Device placed in flowing wastewater to control the flow Biochemical Oxygen Demand: Measure of the amount of oxygen used in the biological process Biosolids: Solid by-product of the wastewater treatment process Bulking: Clouds of sludge in secondary sedimentation tanks when sludge becomes too light to sink Centrate: Water removed from digested sludge during dewatering Centrifuge: Device uses rotational forces to separate liquids from solids Clarifier: Sedimentation tank that holds wastewater for a period of time to separate different materials Colloids: Very small solids that stays in a liquid due to their size and electrical charge Combined Sewer: Sewer that carries both sanitary wastewater and storm water runoff Combined Sewer Overflow: Excess amount of sanitary wastewater and storm water runoff that flow directly into waterways Decomposition: Biological breakdown of organic waste Detention Time: Theoretical time needed for wastewater to pass through a tank Dewater: Remove water from sludge Diffuser: Device used distribute air or chemicals Digestion: Biological decomposition of organic matter in sludge Dissolved Oxygen: Amount of molecular oxygen dissolved in water Effluent: Treated wastewater Flights: Moving scrapers used to push and collect sludge or scum Flocculation: Clumping of bacteria and solids and other impurities or "flocs" Grit: Heavy inorganic material in wastewater Infiltration: Seepage of groundwater into a sewer system Influent: Wastewater flowing into treatment system Inorganic: Material or mineral origin Methane: Component of natural gas Microorganisms: Microscopic animals and plants of simple cell structure Mixed Liquor: Mixture of return activated sludge and primary effluent in aeration tank Nutrients: Substances required to support life Organic: Related to living organisms Polymer: Chemical used to bind small suspended particles to large chemical flocs Preliminary Treatment: Removal of solid objects Primary Treatment: Treatment using physical methods to remove solids Receiving Water: Body of water into which treated or untreated wastewater is discharged Return Activated Sludge: Settled organic solids which are returned to an aeration tank Sanitary Sewer: Sewer used to carry domestic wastewater Screenings: Material removed by the bar screens in preliminary treatment Scum: Layer or film of grease, fats, and floatables in a sedimentation tank Secondary Treatment: Treatment process using natural biological methods to convert materials into more readily separated material Septic: Stagnant sewage in which organic matter begins to decompose anaerobically Sewage: Used water and solids from a community that flow into a treatment plant Sludge: Accumulated organic solids that must be separated from wastewater Sodium Hypochlorite: Solution used for disinfection SPDES: Statewide system that distribute permits to treatment plants to control pollutant levels in effluent Storm Sewer: Separate sewer that carries runoff Suspended Solids: Solids that float or suspended in wastewater Turbidity: Amount of cloudiness of liquid due to suspension of solid particles Wastewater: Used water and solids from a community Weir: Overflow structure from which flow exits a basin

Wastewater Treatment Terminology

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Across:

1.	Life processes that does not need oxygen
4.	Biological breakdown of organic waste
6.	Single-celled organisms
9.	Stagnant sewage in which organic matter begins to decompose anaerobically
11.	Accumulated organic solids that must be separated from wastewater
13.	Wastewater flowing into treatment system
15.	Used water and solids from a community that flow into a treatment plant
16.	Statewide system that distribute permits to treatment plants to control pollutant levels in effluent
18.	Overflow structure from which flow exits a basin
20.	Excess amount of sanitary wastewater and storm water runoff that flow directly into waterways
21.	Mixture of return activated sludge and primary effluent in aeration tank
22.	Component of natural gas
23.	Accumulating solid matter produced by growing microorganisms in aeration tanks
24.	Chemical used to bind small suspended particles to large chemical flocs
26.	Solid by-product of the wastewater treatment process
27.	Remove water from sludge
29.	Material or mineral origin
31.	Sedimentation tank that holds wastewater for a period of time to separate different materials
32.	Clouds of sludge in secondary sedimentation tanks when sludge becomes too light to sink
33.	Body of water into which treated or untreated wastewater is discharged

Down:

2.	Measure of the amount of oxygen used in the biological process
3.	Theoretical time needed for wastewater to pass through a tank
5.	Removal of solid objects
7.	Moving scrapers used to push and collect sludge or scum
8.	Treated wastewater
10.	Additional treatment done to wastewater beyond secondary treatment
12.	Solution used for disinfection
14.	Biological decomposition of organic matter in sludge
17.	Seepage of groundwater into a sewer system
19.	Layer or film of grease, fats, and floatables in a sedimentation tank
25.	Related to living organisms
28.	Life or natural processes that requires oxygen
30.	Heavy inorganic material in wastewater

Wastewater Treatment Terminology

Across:

1.	Life processes that does not need oxygen
4.	Biological breakdown of organic waste
6.	Single-celled organisms
9.	Stagnant sewage in which organic matter begins to decompose anaerobically
11.	Accumulated organic solids that must be separated from wastewater
13.	Wastewater flowing into treatment system
15.	Used water and solids from a community that flow into a treatment plant
16.	Statewide system that distribute permits to treatment plants to control pollutant levels in effluent
18.	Overflow structure from which flow exits a basin
20.	Excess amount of sanitary wastewater and storm water runoff that flow directly into waterways
21.	Mixture of return activated sludge and primary effluent in aeration tank
22.	Component of natural gas
23.	Accumulating solid matter produced by growing microorganisms in aeration tanks
24.	Chemical used to bind small suspended particles to large chemical flocs
26.	Solid by-product of the wastewater treatment process
27.	Remove water from sludge
29.	Material or mineral origin
31.	Sedimentation tank that holds wastewater for a period of time to separate different materials
32.	Clouds of sludge in secondary sedimentation tanks when sludge becomes too light to sink
33.	Body of water into which treated or untreated wastewater is discharged

Down:

2.	Measure of the amount of oxygen used in the biological process
3.	Theoretical time needed for wastewater to pass through a tank
5.	Removal of solid objects
7.	Moving scrapers used to push and collect sludge or scum
8.	Treated wastewater
10.	Additional treatment done to wastewater beyond secondary treatment
12.	Solution used for disinfection
14.	Biological decomposition of organic matter in sludge
17.	Seepage of groundwater into a sewer system
19.	Layer or film of grease, fats, and floatables in a sedimentation tank
25.	Related to living organisms
28.	Life or natural processes that requires oxygen
30.	Heavy inorganic material in wastewater