P8.2.1.7 Routine maintenance Manganese. Manganese Identify of of dosing pumps and concentration is fault and KMnO4 supply Maintenance feedlines to ensure more than 50% rectify. adequate, but log. they are not blocked of the MAV. KMnO4 is not Determine (see Guide P10). being dosed No sign of what steps into the water: insoluble can be taken manganese to stop it Dosing formation happening pump directly after again. failure oxidation Feedlines (metals must be blocked. insoluble to be removed). Maintenance log shows ongoing problems with pump or line blockage. P8.2.1.8 Do routine controller Manganese. Manganese Identify cause maintenance. concentration is of fault and Dose Maintenance more than 50% rectify. controller Replace controller log. of the MAV. malfunction. with a reliable unit if Replace the present unit is No sign of controller with suspect. insoluble a new unit. manganese formation directly after oxidation (metals must be insoluble to be removed). Maintenance log shows frequent maintenance needed. Event: NOT ALL THE MANGANESE REMOVED cont’d
P8.2.1.7 KMnO4 supply adequate, but KMnO4 is not being dosed into the water: Dosing pump failure Feedlines blocked. Routine maintenance of dosing pumps and feedlines to ensure they are not blocked (see Guide P10). Manganese. Maintenance log. Manganese concentration is more than 50% of the MAV. No sign of insoluble manganese formation directly after oxidation (metals must be insoluble to be removed). Maintenance log shows ongoing problems with pump or line blockage. Identify of fault and rectify. Determine what steps can be taken to stop it happening again. P8.2.1.8 Dose controller malfunction. Do routine controller maintenance. Replace controller with a reliable unit if the present unit is suspect. Manganese. Maintenance log. Manganese concentration is more than 50% of the MAV. No sign of insoluble manganese formation directly after oxidation (metals must be insoluble to be removed). Maintenance log shows frequent maintenance needed. Identify cause of fault and rectify. Replace controller with a new unit. Event: NOT ALL THE MANGANESE REMOVED cont’d