Published on November 5, 2008
b.stev How potable H 2 O is produced
The Resource Management Act 1991 LOCAL AUTHORITIES control & regulate the drinking water supplies , Ensuring safe water is delivered to our homes. The DEPARTMENTS work together closely to provide this . ( Govt NZ, 2008) H 2 O in NZ that is utilised in homes is monitored in accordance with:
Ministry of Environment & the Regional Council monitor the source of H 2 O [Rivers & Groundwater] Resource Management Act 1991 stipulates the tools needed to ensure this supply . The ,”Council Officers,” are responsible to the position (Govt NZ, 2008)
Ministry of Health H 2 O treated under the law of the: Health Amendment Bill of Drinking Water The ,”Drinking Water Assessors,” are responsible The Building Act Building Inspectors: responsible to the tap (Govt NZ, 2008)
Discussion: Outline the Treatment Process of POTABLE H 2 O Includes: sedimentation coagulaton filtration disinfection storage reticulation
treatment begins by sedimentation H 2 O is collected in a large tank, the SOILDS in H 2 O settle by gravity
Particles smaller than 0.1um remain in motion due to ELECTROSTATIC CHARGE . This charge ALSO causes these small particles to repel each other.
A coagulant chemical is added that neutralises the water. The particles then agglomerate & also then settle - these bigger particles are called ,”FLOCS”
Often used in smaller plants Mixed gently to prevent molecular breakage FILTER AID POLYMERS, 0.1mg/L , added to lengthen filter run times CHEMICLALS USED Aluminium sulphate Polyaluminium chloride MOST COMMON Usually dosed at >1mg/L Ferric chloride Ferric sulphate
H 2 O is THEN filtered, It removes particles – to the size of: 0.035 microns . It catches almost ALL bacteria
Often used ,” sand filtering ,” ie: MASTERTON’S TOWN SUPPLY - utilises this process & then the H 2 O is covered in a pond NZ’s newest,“ ultrafiltration ,” plant is located in the WAIKATO REGION. Filters: 75 million litres per day (International NZ, 2008) (Masterton District Council, 2008)
CHLORINE is the most used chemical 98% treated H 2 O is with chlorine chlorine dioxide is very strong & effective against crytosporidium sodium hypo chlorite solution solid calcium hypo chlorite Before delivery along: reticulation system H 2 O is disinfected to remove the BACTERIA
CHLORINE is the most used chemical
98% treated H 2 O is with chlorine
chlorine dioxide is very strong &
effective against crytosporidium
sodium hypo chlorite solution
solid calcium hypo chlorite
Economical Reliable Straightforward Measurable Protects H 2 O from contamination at treatment to the TAP Chlorine is :
Protects H 2 O from contamination
at treatment to the TAP
ALSO : extracts hydrogen sulfide, ammonia & nitrogen compounds that cause unpleasant taste. Stops: moulds slime bacteria algae that grow on the walls of pipes & storage tanks
A local DAM or TANK : holds MILLIONS of Litres. Household’s are supplied from this, via the use of a reticulation system (network of pipes & junctions)
:is a system of PIPES that carries H 2 O to the house/s Treated H 2 O is passed through an extensive network of pipes .
30% saving of supply H 2 O can be achieved with the instalment of tanks (on site) to collect rainwater & GREYWATER (sinks/ laundry& bathroom) SAVING the WATER SUPPLY
IN DOING THIS: Residents obtain a more consistant and regular supply as the peak demand can be satisfied THE AIM: less than < 1000L per day (For each house on town supply)
Bibliography Masterton District Council. (2008). Water treatment and supply-masterton district council . Retrieved September 15, 2008, from http//: www.mstn . govt.nz/services/ water /index.php International NZ. (2008). Waikato water treatment plant . Retrieved September 15, 2008, from http//: www.ch2m.com/corporate/worldwide/assests/ ProjectPortfolio/australia/ Waikato .pdf New Zealand. Govt NZ. (2008). Resource Management Act [Ministry for the Environment] . Retrieved September 15, 2008, from http ://www.mfe.govt.nz/rma/index.php
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