wastewater in NZ, sewage treatment in NZ, process of wastewater in NZ, process of sewage treatment in NZ, primary secondary tertiary treatment of waste water, screening of wastewater, grit removal tanks, sedimentation, process of separation, anaerobic digestors, activated sludge, trickling filters, oxidation ponds, polishing ponds, disinfection of waste water, wetlands, irrigation, UV lamp disinfection of wastewater, chlorine disinfection of wastewater, ozone disinfection of wastewater
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”
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
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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)
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)
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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
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