P8.2.5.1 Regeneration of the resin High counts Regenerate at the frequency quality. of total and Organic recommended by the bacteria. matter and Calcium. manufacturer. This will Hardness Clean resin to Magnesium. also back-flush the bed not remove bead and remove organic Iron. trapped in reduced. fouling. material. the resin Manganese. Iron and/or Disinfect the bed. Regularly (de-foul) manganese water after the the resin beads with the not recommended cleaning removed. agent if iron or Odour. manganese are present in the water. out treatment to remove organic matter from the water before the softener. 1 The consequences of the event, and therefore the level of risk, will be influenced by how well subsequent disinfection processes work. Contingency Plans If an event happens despite preventive and corrective actions you have taken, you may need to consult with the Medical Officer of Health to assess how serious a problem is. Faecal matter gets into the water through the aerator Event – Faecal indicator or pathogens are continually detected Indicators: in the water leaving the plant. Knowledge of an animal having entered the aerator. Widespread sickness in the community linked to the water supply. Follow the actions given in Figure 3.2 of the Required DWSNZ:2000. actions: Identify the reason for the failure and rectify. Record cause of system failure and steps taken to correct. Modify your water safety plan if necessary. Manager designated responsible for the water supply. Responsibility: Very high oxidant concentration Event –
P8.2.5.1 Organic matter and trapped in the resin bed. Regeneration of the resin at the frequency recommended by the manufacturer. This will also back-flush the bed and remove organic material. Regularly (de-foul) the resin beads with the recommended cleaning agent if iron or manganese are present in the water. out treatment to remove organic matter from the water before the softener. quality. Calcium. Magnesium. Iron. Manganese. High counts of total bacteria. Hardness not reduced. Iron and/or manganese not removed. Odour. Regenerate and Clean resin to remove bead fouling. Disinfect the water after the 1 The consequences of the event, and therefore the level of risk, will be influenced by how well subsequent disinfection processes work. Contingency Plans If an event happens despite preventive and corrective actions you have taken, you may need to consult with the Medical Officer of Health to assess how serious a problem is. Event – Faecal matter gets into the water through the aerator Indicators: Faecal indicator or pathogens are continually detected in the water leaving the plant. Knowledge of an animal having entered the aerator. Widespread sickness in the community linked to the water supply. Required actions: Follow the actions given in Figure 3.2 of the DWSNZ:2000. Identify the reason for the failure and rectify. Record cause of system failure and steps taken to correct. Modify your water safety plan if necessary. Responsibility: Manager designated responsible for the water supply. Event – Very high oxidant concentration
treatment-iron-manganese-removal-feb14-v2.docx