Table A1.1 (continued) Framework element and components Activity Human health Corrective action automatically until remedial action is implemented; that is, flow is stopped if: flow rates stop minimum lagoon-detention times being met – maximum turbidity (10 nephelometric turbidity units, NTU) is – exceeded for more than 60 minutes disinfection fails – users of recycled water who fail to apply on-site restrictions can be • disconnected noncompliance with other limits can result in corrective action • being taken while the system remains operational if numbers in the influent to the lagoons exceed Cryptosporidium • 50/L, increased monitoring is activated at the DAFF plant and operators are notified. Environmental performance In relation to the environment, corrective actions include the following: if the target value of 1450 mg/L TDS is exceeded, the continuous • monitoring of EC of recycled water entering the reticulation system is reviewed and intensified; any corrective actions possible are taken to ensure the sewage systems and treatment plant has not malfunctioned if the critical limit (1500 mg/L TDS) of the treated water is • exceeded, then the treated water is with drinking water. ‘shandied’ Human health In relation to human health: Equipment capability and online measuring devices include 24-hour monitored alarm systems • maintenance for key devices including filtration and disinfection; backup power is available In relation to human health, the filtration plant incorporates variable dosing and variable control • of flow rates. corrective actions include the following: Environmental performance noncompliance with In relation to the environment: • critical limits results on-site moisture sensors or other monitoring tools are used to • in flow to the maximise irrigation efficiency irrigation system EC is also monitored continuously as a measure of TDS and • being stopped salinity entering the system. Quality assurance for materials and chemicals is applied to ensure Materials and chemicals • that they do not introduce contaminants into the recycled water system.
Table A1.1 (continued) Framework element and components Corrective action Human health Activity Equipment capability and maintenance In relation to human health, corrective actions include the following: • noncompliance with critical limits results in flow to the irrigation system being stopped automatically until remedial action is implemented; that is, flow is stopped if: – flow rates stop minimum lagoon-detention times being met – maximum turbidity (10 nephelometric turbidity units, NTU) is exceeded for more than 60 minutes – disinfection fails • users of recycled water who fail to apply on-site restrictions can be disconnected • noncompliance with other limits can result in corrective action being taken while the system remains operational • if Cryptosporidium numbers in the influent to the lagoons exceed 50/L, increased monitoring is activated at the DAFF plant and operators are notified. Environmental performance In relation to the environment, corrective actions include the following: • if the target value of 1450 mg/L TDS is exceeded, the continuous monitoring of EC of recycled water entering the reticulation system is reviewed and intensified; any corrective actions possible are taken to ensure the sewage systems and treatment plant has not malfunctioned • if the critical limit (1500 mg/L TDS) of the treated water is exceeded, then the treated water is ‘shandied’ with drinking water. Human health In relation to human health: • online measuring devices include 24-hour monitored alarm systems for key devices including filtration and disinfection; backup power is available • the filtration plant incorporates variable dosing and variable control of flow rates. Environmental performance In relation to the environment: • on-site moisture sensors or other monitoring tools are used to maximise irrigation efficiency • EC is also monitored continuously as a measure of TDS and salinity entering the system. Materials and chemicals • Quality assurance for materials and chemicals is applied to ensure that they do not introduce contaminants into the recycled water system.
water-recycling-guidelines-full-21.docx