P8.2.2.5 Check the KMnO4 Manganese Determine the concentration of the dose. concentration cause of the KMnO4 dosing KMnO4 dosing more than 50% high KMnO4 solution KMnO4 solution when it is of its MAV. concentration concentration first prepared. and rectify. too high. in the Pink Separate chemical dosing Provide storage from dosing solution. training in the concentration in solution preparation preparation of the dosing tanks to reduce the oxidant solution above likelihood of chemical solutions the level spillage into the (including expected. tanks. calculations). Identify the reasons for any spillage and rectify if possible. Event: GERMS INTRODUCED DURING AERATION Possible hazards: Germs. Level of risk: Moderate1 P8.2.3.1 netting over E. coli or Disinfection of aerator grills to stop water quality. coliforms the water entry of larger detected in a following organisms animals (eg, birds, 100 ml sample aeration. introduced rats, etc). taken after the into the water aerator. during Provide disinfection aeration, following aeration to either in the inactivate germs that airstream or get into the water. through animals entering the aerator. 1 The consequences of the event, and therefore the level of risk, will be influenced by how well following disinfection processes works. Preventive measures Checking preventive measures Corrective action Causes What to check Signs that action is needed Removal by ion exchange Event: INCOMPLETE REMOVAL OF MANGANESE Possible hazards: Manganese. Level of risk: Low
P8.2.2.5 KMnO4 dosing solution concentration too high. Check the concentration of the KMnO4 dosing solution when it is first prepared. Separate chemical storage from dosing solution preparation tanks to reduce the likelihood of chemical spillage into the tanks. KMnO4 dose. KMnO4 in the dosing solution. Manganese concentration more than 50% of its MAV. Pink concentration in the dosing solution above the level expected. Determine the cause of the high KMnO4 concentration and rectify. Provide training in the preparation of oxidant solutions (including calculations). Identify the reasons for any spillage and rectify if possible. Event: GERMS INTRODUCED DURING AERATION Possible hazards: Germs. Level of risk: Moderate1 P8.2.3.1 introduced into the water during aeration, either in the airstream or through animals entering the aerator. netting over aerator grills to stop entry of larger animals (eg, birds, rats, etc). Provide disinfection following aeration to inactivate germs that get into the water. water quality. E. coli or coliforms detected in a 100 ml sample taken after the aerator. Disinfection of the water following aeration. 1 The consequences of the event, and therefore the level of risk, will be influenced by how well following disinfection processes works. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Removal by ion exchange Event: INCOMPLETE REMOVAL OF MANGANESE Possible hazards: Manganese. Level of risk: Low organisms
treatment-iron-manganese-removal-feb14-v2.docx