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Treatment of Waste H2O b.stev
the USED H 2 O of a COMMUNITY  ie: kitchen sink/ tub/ toilet  shower/ laundry/ industry ,[object Object],[object Object],[object Object]
PRIMARY:  infiltration/   screening/ grit removal/ sedimentation SECONDARY :  anaerobic digestors (organic waste) activated sludge/  trickling filters/ oxidation ponds (H2O) TERTIARY:   disinfection/ wetlands/ irrigation
WASTEWATER  system  starts  as a  complex  network  of  pipes &  junctions that feed  the  material  and  fluid to the  treatment  plant PIPES last 20-50yrs:dependent upon material used ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PRIMARY TREATMENT This  load  increase is known as,”INFILTRATION,”. Maintenance  is constant to : ,[object Object],[object Object],[object Object],[object Object],PREVENTS SEWER overflow and seeping into the soil/ drains and  the  environment
SCREENING FINE SCREENS intercept :  ,[object Object],[object Object],[object Object],[object Object],DRUM SHAPE revolves: 3 mm screens  of stainless steel that catches the debris DEBRIS is transported offsite to a landfill Arrival at the treatment plant :
PUMPED AIR in the FLUID generates motion This reduces  density  & allows  grit  to settle in HOPPERS  GRIT REMOVAL TANKS This: GRIT,  is removed offsite ORGANIC SOLIDS  remain suspended (Water Care Services Ltd, 2008)
AUTOMATIC  scrapers collect this from a  sloped   floor removed offsite SEDIMENTATION FLUID & ORGANIC SOLIDS  slowly   flow within big tanks, this settles the “organic solids”
SEDIMENTATION ANAEROBIC DIGESTORS ACTIVATED SLUDGE Process of Separation [organic waste] [wastewater]
37.5C  & acid forming bacteria  breakdown organic materials  organic acids ANAEROBIC DIGESTORS BIOGAS:  collected to generate  POWER,  contributes to the electricity demand in the plant THE GAS is collected – called,” BIOGAS ,” (Water Care Services Ltd, 2008) NEXT: methane forming bacteria utilise acids  produce  methane  & CO 2   gas
 
Activated sludge Trickling filters Oxidation ponds Polishing ponds DISINFECTION Irrigation Wetlands Outlet THE PROCESS
bacteria  strip out,  organic   pollutants  This  DECREASES   the  concentration of  pollutants  in the ,”  WASTEWATER ,”. ACTIVATED SLUDGE wastewater   after the,”sedimentation,” :  aerated   with O 2  &  saprotrophic  bacteria  (Water Care Services Ltd, 2008)
An example of an activated sludge tank:
TRICKLING FILTERS
ALGAE & BACTERIA  mature  the H 2 O and  an  anaerobic  sludge layer settles  OXIDATION PONDS MOST   COMMON  SYSTEM  used in NZ 4 – 6 week stage of treatment Large pond/s where the H 2 O is,”settled out.” (Water Care Services Ltd, 2008)
Most effective method is to utilise,  SERIES  of cells, in the process ALSO:  remaining time it takes  for the  human   intestinal   bacteria   to  die off POLISHING PONDS 5 -10  day process: settles the  algal  solids  left in the H 2 O after having ,” settled   out .”
UV   gives high quality product  the harbour first : the H 2 O passes through  sand   filters  that extract particles to:  DISINFECTION 15 microns 254nm quartz tube lamp of 300W is used Mangere Site has 7776 UV LAMPS (Water Care Services Ltd, 2008)
CHLORINE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],OZONE (American Chemistry Council, 2005) ALSO:
USED FOR:  septic tank & oxidation pond effluent &, secondary/tertiary stages of treatment WETLANDS 5 – 10 day  flow through a ,”wetland,” - plants rooted in  soil  of a  shallow   pond BACTERIA settle to plant stems and  aeration of  H 2 O  transfers the process
IRRIGATION H 2 O  from the  treatment plant  can  be used for  IRRIGATION  purposes THOUGH  much care is needed to ensure the soil & vegetation is not  suscepted to  microbial contamination  from this. VERY  dependent:  toxcity   hazard  involved with the use of land &  timing of the crops to be grown
Bibliography Disinfection of wastewater.  (n.d). Retrieved September 18, 2008, from  http//: www.me.vccs.edu/courses/ENV149/ disinfectionb.htm  - 5k American Chemistry Council.Inc. (2007).  Chlorine chemistry division- wastewater disinfection . Retrieved September 18, 2008, from  http//: www.americanchemistry.com/s  chlorine/sec content.asp?CID=1198& DID=4534&CTYPEID=107 Science Learning Hub. (2008).  Disinfection of wastewater.sciencelearn.hub . Retrieved September 18, 2008, from  http//:www.sciencelearn.org.nz /contents/you_me_and_uv/nz_research/ disinfecting_wastewater- 25k Ministry of Environment. (2005).  Client . Retrieved September 18, 2008,  from  http//:www.nzwwa.org.nz/Guideline%20for%20Oxidation %20Ponds%202005%20Final…-
Global Water Instrumentation.Inc. (2007).  Inflow and infiltration of sanitary  sewer systems . Retrieved September 18, 2008, from  http//:www. globalw.com/support/inflow.html – 33k Natural Resource Management and Environmental Department. (2007). Retrieved September 18, 2008, from  http//:www.fao.org/docrep/t0 551e07.htm – 129k

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Treatment of Waste H2O

  • 1. Treatment of Waste H2O b.stev
  • 2.
  • 3. PRIMARY: infiltration/ screening/ grit removal/ sedimentation SECONDARY : anaerobic digestors (organic waste) activated sludge/ trickling filters/ oxidation ponds (H2O) TERTIARY: disinfection/ wetlands/ irrigation
  • 4.
  • 5.
  • 6.
  • 7. PUMPED AIR in the FLUID generates motion This reduces density & allows grit to settle in HOPPERS GRIT REMOVAL TANKS This: GRIT, is removed offsite ORGANIC SOLIDS remain suspended (Water Care Services Ltd, 2008)
  • 8. AUTOMATIC scrapers collect this from a sloped floor removed offsite SEDIMENTATION FLUID & ORGANIC SOLIDS slowly flow within big tanks, this settles the “organic solids”
  • 9. SEDIMENTATION ANAEROBIC DIGESTORS ACTIVATED SLUDGE Process of Separation [organic waste] [wastewater]
  • 10. 37.5C & acid forming bacteria breakdown organic materials organic acids ANAEROBIC DIGESTORS BIOGAS: collected to generate POWER, contributes to the electricity demand in the plant THE GAS is collected – called,” BIOGAS ,” (Water Care Services Ltd, 2008) NEXT: methane forming bacteria utilise acids produce methane & CO 2 gas
  • 11.  
  • 12. Activated sludge Trickling filters Oxidation ponds Polishing ponds DISINFECTION Irrigation Wetlands Outlet THE PROCESS
  • 13. bacteria strip out, organic pollutants This DECREASES the concentration of pollutants in the ,” WASTEWATER ,”. ACTIVATED SLUDGE wastewater after the,”sedimentation,” : aerated with O 2 & saprotrophic bacteria (Water Care Services Ltd, 2008)
  • 14. An example of an activated sludge tank:
  • 16. ALGAE & BACTERIA mature the H 2 O and an anaerobic sludge layer settles OXIDATION PONDS MOST COMMON SYSTEM used in NZ 4 – 6 week stage of treatment Large pond/s where the H 2 O is,”settled out.” (Water Care Services Ltd, 2008)
  • 17. Most effective method is to utilise, SERIES of cells, in the process ALSO: remaining time it takes for the human intestinal bacteria to die off POLISHING PONDS 5 -10 day process: settles the algal solids left in the H 2 O after having ,” settled out .”
  • 18. UV gives high quality product the harbour first : the H 2 O passes through sand filters that extract particles to: DISINFECTION 15 microns 254nm quartz tube lamp of 300W is used Mangere Site has 7776 UV LAMPS (Water Care Services Ltd, 2008)
  • 19.
  • 20. USED FOR: septic tank & oxidation pond effluent &, secondary/tertiary stages of treatment WETLANDS 5 – 10 day flow through a ,”wetland,” - plants rooted in soil of a shallow pond BACTERIA settle to plant stems and aeration of H 2 O transfers the process
  • 21. IRRIGATION H 2 O from the treatment plant can be used for IRRIGATION purposes THOUGH much care is needed to ensure the soil & vegetation is not suscepted to microbial contamination from this. VERY dependent: toxcity hazard involved with the use of land & timing of the crops to be grown
  • 22. Bibliography Disinfection of wastewater. (n.d). Retrieved September 18, 2008, from http//: www.me.vccs.edu/courses/ENV149/ disinfectionb.htm - 5k American Chemistry Council.Inc. (2007). Chlorine chemistry division- wastewater disinfection . Retrieved September 18, 2008, from http//: www.americanchemistry.com/s chlorine/sec content.asp?CID=1198& DID=4534&CTYPEID=107 Science Learning Hub. (2008). Disinfection of wastewater.sciencelearn.hub . Retrieved September 18, 2008, from http//:www.sciencelearn.org.nz /contents/you_me_and_uv/nz_research/ disinfecting_wastewater- 25k Ministry of Environment. (2005). Client . Retrieved September 18, 2008, from http//:www.nzwwa.org.nz/Guideline%20for%20Oxidation %20Ponds%202005%20Final…-
  • 23. Global Water Instrumentation.Inc. (2007). Inflow and infiltration of sanitary sewer systems . Retrieved September 18, 2008, from http//:www. globalw.com/support/inflow.html – 33k Natural Resource Management and Environmental Department. (2007). Retrieved September 18, 2008, from http//:www.fao.org/docrep/t0 551e07.htm – 129k