❓ Question regarding the monitoring and management of carcinogenic NDMA N-Nitrosamines in wastewater used for the Beenyup groundwater replenishment trial, focusing on adherence to Australian Drinking Water Guidelines. The Minister confirms monitoring, outlines management measures, and expresses no concerns about relaxing NDMA levels.
AnsweredQoN 2657Legislative Council
QuestionView source ↗
I refer to the groundwater replenishment trials at Beenyup, and ask -
(1) Are levels of carcinogenic NDMA N-Nitrosamines in wastewater monitored for the Beenyup Groundwater replenishment treated wastewater trial?
(2) If yes to (1), -
(a) what levels of NDMA N-Nitrosamines will trigger greater levels of analysis and monitoring; and
(b) what management measures are in place to monitor, mitigate and prevent NDMA N-Nitrosamines in excess of Australian Drinking Water Guidelines, being reinjected into the Leederville aquifer?
(3) What method for monitoring NDMA N-Nitrosamines has been developed?
(4) What are the current reporting levels for NDMA N-Nitrosamines required under the Australian Drinking Water Guidelines?
(5) What concerns does the Minister hold for relaxing the allowable level of NDMA N-Nitrosamines in treated wastewater for groundwater replenishment from 10ng/litre to 100ng/litre as proposed by the draft revised Australian Drinking Water Guidelines?
(1) Are levels of carcinogenic NDMA N-Nitrosamines in wastewater monitored for the Beenyup Groundwater replenishment treated wastewater trial?
(2) If yes to (1), -
(a) what levels of NDMA N-Nitrosamines will trigger greater levels of analysis and monitoring; and
(b) what management measures are in place to monitor, mitigate and prevent NDMA N-Nitrosamines in excess of Australian Drinking Water Guidelines, being reinjected into the Leederville aquifer?
(3) What method for monitoring NDMA N-Nitrosamines has been developed?
(4) What are the current reporting levels for NDMA N-Nitrosamines required under the Australian Drinking Water Guidelines?
(5) What concerns does the Minister hold for relaxing the allowable level of NDMA N-Nitrosamines in treated wastewater for groundwater replenishment from 10ng/litre to 100ng/litre as proposed by the draft revised Australian Drinking Water Guidelines?
AnswerView source ↗
Answered
14 September 2010
Responded by
Minister for Transport representing the Minister for Health
Response time
35 days
(1) Yes
(2)(a) Concentration greater than 80 percent of the Draft Australian Drinking Water Guidelines 2010 (i.e. 80 ng/L).
(b) Measures in place include:
- implementation of the 12 elements of the risk management framework of the Australian Guidelines for Water recycling: Managing Health and Environmental Risk (phase 2) Augmentation of Drinking Water Supplies (2008), including the hazard analysis, a critical control points system;
- recycled water with N-nitrosodimethylamine (NDMA) above 100ng/L will be diverted away from injection;
- optimisation of the Beenyup Advanced Treatment Plant chloramination time to minimise NDMA formation; and
- a Memorandum of Understanding between the Water Corporation and the Department of Health for the Ground Water Replenishment Trial (GWRT).
(3) Solid Phase Extraction (SPE) followed by Gas Chromatography (GC) and quantification by mass spectrometry (MS) with electron ionization (EI).
(4) Health value is 100 ng/L based on Draft Australian Drinking Water Guidelines 2010.
(5) No concerns. Typical analytical reporting detection level is at 1 ng/L.
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(2)(a) Concentration greater than 80 percent of the Draft Australian Drinking Water Guidelines 2010 (i.e. 80 ng/L).
(b) Measures in place include:
- implementation of the 12 elements of the risk management framework of the Australian Guidelines for Water recycling: Managing Health and Environmental Risk (phase 2) Augmentation of Drinking Water Supplies (2008), including the hazard analysis, a critical control points system;
- recycled water with N-nitrosodimethylamine (NDMA) above 100ng/L will be diverted away from injection;
- optimisation of the Beenyup Advanced Treatment Plant chloramination time to minimise NDMA formation; and
- a Memorandum of Understanding between the Water Corporation and the Department of Health for the Ground Water Replenishment Trial (GWRT).
(3) Solid Phase Extraction (SPE) followed by Gas Chromatography (GC) and quantification by mass spectrometry (MS) with electron ionization (EI).
(4) Health value is 100 ng/L based on Draft Australian Drinking Water Guidelines 2010.
(5) No concerns. Typical analytical reporting detection level is at 1 ng/L.
Notice: This document is created or edited using unregistered or evaluation copy of rtLib valid for testing or development purposes only. To use it for productive or any other purposes please register it. You may purchase the license on
http://www.rtlib.com
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