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Waste Mana > Sanitary Sewage > Flashcards

Sanitary Sewage Flashcards

1
Q

Sanitary Sewage

A

wastewater from households, institute and commercial establishment
threat to human health
E.Coli-> monitored for using fecal coliform tests

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2
Q

A. Problems ass w Direct Release of Sanitary Sewage

A

1) Release of Disease-Causing Agents (virus…)

2) Eutrophication: +N, P in water -> increase in V of aquatic plants

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3
Q

D. I & II sludge

A
  • Dewatering to decrease V
  • Anaerobic digester to generate heat + kill bac
  • Digested sludge to go Sheppard LF
  • go to CALGRO to further process
  • applied to agriculture land
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4
Q

CALGRO

A
  • Biosolid-to-land Program started 1983 btw the city and province
  • Beneficiaries: provides Local farmers w fertilizers from biosolids
  • I & II sludge taken from WWTP converted to biosolids, taken to Shepard Lagoons and Sheppard landfill
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5
Q

Rules and Regs for biosolids

A 
crop restrictions
minimum N/P/ metal ratios 
max application rates 
agricultural Land pH requirements (6.5) 
seasonal restrictions on land application
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6
Q

septic tank & tile beds

A

h2o well shouid be upgradient

min distance 25-35m

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7
Q

design of septic tank

A

2 basic layers

  • septic tank
  • drainage field (Absorption field)
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8
Q

septic tank

A

undergrd tank, used to separate liquids from solids

anaerobic digestion

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9
Q

drainage field

A

consists of a series of perforated pipes located below the soil surface
release the WW contains Suspended organic, mineral matter

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10
Q

soil type for DF

A

k soil

good percolation of the ww thru soil

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11
Q

depth to water table

A

in unsaturated zone
lots of O2 available for digestion of WW
5m below the base of DF

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12
Q

Depth of the Bed rx

A

> 1.2 m below drainage field

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13
Q

topography

A

surface slope <150

shallow enough so WW doesn’t run quickly off-site

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14
Q

anaerobic digestion of the organics

A

produces CO2, CH4, NH4
tank leaks can release large V of pathogens into the soil
be careful of bleaches + drainage cleaners - destroy the anaerobic system

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15
Q

evolution of the waste stream

A
  1. anaerobic digestion of the organics
  2. aerobic oxidation of the organic matter and NH4
  3. anaerobic denitrification
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16
Q

aerobic oxidation of the OM and amonia

A

OM -> CO2(g) (oxidation)

NH4 -> NO3- + H+ -> by product + CaCO3 -> buffer the acids

17
Q

anaerobic denitrification

A

rare

NO3 -> N2 (reduction)

18
Q

contaminant Ass w Septic tank

A

CH4, NH4, CO2, trace meals

19
Q

contaminant ass w DF

A

NO3-, Ca2+, CO2

20
Q

aerobic spray system

A

3 tank system

  • tank1: solids settle out
  • tank2: air pumping to promote the aerobic digestion
  • tank3: the water treated with chlorine
    tank4: sprinkler system: discharge water onto surface
21
Q

Sewage disposal options

A 
Ocean dumping 
Landfilling 
Land application 
Incineration 
WWT facility
22
Q

Municipal WWT facilities

A

Purpose: removal of SS & pathogens from water

Accomplished by: primary, secondary & tertiary treatments

23
Q

Primary

A 
Physical 
Remove Large particles 
Screen &amp;gravitational settling tech 
Solid from screen -> LF
Solid is primary sludge
24
Q

Secondary

A

Biological
Remove suspended OM
Accomplished: trickling filter, activated sludge processes & BPNR bioreactors

25
Q

Trickling filters

A

WW + aerated Rx bed + aerobic microbes = consumed OM

26
Q

Activated Sludge Processes

A

Digested particles settle down @ bottom

Remove OM but dissolved contaminants N,P + Pathogens

27
Q

BPNR bioreactor

A

3 steps process that utilizes anaerobic, anoxic & aerobic
Remove soluble N, P, OM

28
Q

BPNR pros

A

Green solutions that used natural bacteria

Less sludge produced

29
Q

BPNR cons

A

High skill level-worker
Expensive labs to monitor & analysis
Need a standby chem facility

30
Q

Tertiary

A

Chemical
Removal of Dissolved minerals, heavy metals, pathogens
Accomplished: Cl2, UV disinfection, BPNR, chem removal of P

Waste Mana (6 decks)

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