Certification Boulevard Answer Key From page 37 February 2014
Editorial Calendar January ......Wastewater Treatment February ....Water Supply; Alternative Sources March ........Energy Efficiency; Environmental Stewardship April............Conservation and Reuse May ............Operations and Utilities Management; Florida Water Resources Conference June ..........Biosolids Management and Bioenergy Production July ............Stormwater Management; Emerging Technologies; FWRC Review
1. C) 8.34 pounds per mil gal One part of anything in relationship to one million parts of the same thing is 1 ppm, like 1 gal of water to 1,000,000 gal of water. So, one gal, which weighs 8.34 lbs, in 1,000,000 gal is equal to 1 ppm. For example, 1 in. in about 15.78 mi is equal to 1 ppm. Also, one mg per liter (mg/L) is the same as one part per mil (ppm). The conversion is long and drawn out, but it’s the same!
2. B) Fermentation The fermentation zone of a Bardenpho process receives raw wastewater (usually after preliminary treatment) and returns activated sludge (from secondary clarifiers). The MLSS is mixed and not aerated in the fermentation zone for a time period of about one to three hours. This zone, absent of all sources of oxygen, basically activates a group of phosphorus-accumulating organisms (PAO), which trades phosphorus for CBOD5. These bugs release phosphorus from their cells and “grab onto” food for later decomposition. A successful fermentation zone will have phosphorus levels in the outlet about two to four times higher than the inlet to the tank.
3. B) Organic content
August........Disinfection; Water Quality September..Emerging Issues; Water Resources Management October ......New Facilities, Expansions, and Upgrades November ..Water Treatment December ..Distribution and Collection Technical articles are usually scheduled several months in advance and are due 60 days before the issue month (for example, January 1 for the March issue). The closing date for display ad and directory card reservations, notices, announcements, upcoming events, and everything else including classified ads, is 30 days before the issue month (for example, September 1 for the October issue). For further information on submittal requirements, guidelines for writers, advertising rates and conditions, and ad dimensions, as well as the most recent notices, announcements, and classified advertisements, go to www.fwrj.com or call 352-241-6006.
The CBOD5 basically identifies the pollutional strength of the raw wastewater. It determines the amount of oxygen required to breakdown the organic material in the wastewater, measured as mg/L (ppm).
4. C) Denitrification Denitrification is an anoxic reaction and will be typically accomplished at the highest rate in an anoxic zone with adequate food supply (CBOD5). The anoxic reaction is elevated to its highest potential when the bugs are hungry and active, the CBOD5 is plentiful, the tank is mixed without any oxygen transfer, and the dissolved oxygen level is as close as possible to zero.
5. A) Volatile Suspended Solids (VSS) The VSS test requires the use of an analytical balance, a drying oven, filter papers, a muffle furnace, and a desiccator. The balance is for weighing the sample, the drying oven is for evaporation of moisture, the filter papers capture suspended solids on the media, the muffle furnace is to burn volatile solids and allow fixed solids to remain, and the desiccator cools the filter paper and prevents moisture from adding weight to the filter paper.
6. B) Five days at 20°C The CBOD5 test is conducted by incubating the conditioned sample at a temperature of 20oC (68ºF) for a period of five days.
7. B) Volume of a circular tank in gallons The formula to calculate the volume in gallons of a circular tank: π r2 x cone depth, ft x 7.48 gals/ft3
Display Advertiser Index Blue Planet..................................55
FWRC
CEU Challenge ............................31
Announcement ..........................7
Crom ..........................................46
Team Spirit ................................8
Data Flow....................................29
Exhibitors ..................................9
Drop Savers ................................43
Registration..............................10
Evoqua........................................19
Floor Layout ............................11
FSAWWA Awards ......................33
Garney ..........................................5
FSAWWA Thank You Members ....38
Hudson Pumps............................27
FSAWWA Training........................39
McKim & Creed ..........................25
FWEA Collections Sytems ............21
Stacon ..........................................2
FWPCOA Region VIII ....................15
Treeo ..........................................47
FWPCOA Training ........................41
Xylem..........................................56
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January 2016 • Florida Water Resources Journal
8. C) Rotifer Beginning with the lowest life form, the microorganism indicators are amoebas, small flagellates, large flagellates, free-swimming ciliates, stalk ciliates, rotifers, nematodes and water bears. So, of the three indicators listed in the question, the rotifer is the highest life form in the activated sludge process.
9. A) Aeration mixed liquor volatile suspended solids (MLVSS) and influent CBOD5 The F/M ratio compares the food value as applied to the volatile bug population. The food value is indicated with the CBOD5 content in the influent wastewater, and the volatile bug content is identified by testing the aeration system mixed liquor for its volatile fraction, which is mixed liquor volatile suspended solids.
10. C) To gather onto the surface of a substance The term adsorption refers to one substance gathering (or sticking) onto the surface of another substance, like flies sticking to flypaper. Another definition for adsorption is the process of trapping gas and vapor molecules within the pores of a microporous solid, such as activated carbon.