Aluminium Determine and Frequent Change residual implement effective backwashes. procedure for backwash cycle backwash Mud-balls procedure. Consider: cycles. and/or cracks Filter log. timing of air scour, in filters. settling and water Boil-up and/or wash dead turbidity criteria during set for backwash. protocol Loss of media. before putting filter back in service a log to record identified problems, and what was done to rectify them optimisation of the filter ripening operation. Make sure operators Identify staff are trained in correct training needs maintenance and and provide operation procedures training. for the specific filters in use. P6.1.1.4 (See also P6.3.1.3.) Develop and use Maintenance log Increase pump book (see also frequency of Inadequate maintenance P6.1.1.3). media and filter schedule. Schedule filter should follow inspection if manufacturer’s excess recommendations residual and include: coagulant detected in the lubrication; treated water. replacement cycle for elastomeric components (eg, flexible couplings) component inspection (valves, pumps, compressors etc) inspection logbook. Inspect and Start chemical chemically clean cleaning media at least programme. annually. Identify staff Ensure operators are training needs trained in correct and provide maintenance training. procedures for the specific filters in use. Event: NATURAL ORGANIC MATTER NOT REMOVED Possible hazards: Germs; disinfection by-products (trihalomethanes, haloacetic acids, chloral hydrate (chlorine), chlorite (chlorine dioxide), bromate, bromoform, formaldehyde (ozone)). Level of risk: Moderate1
Determine and implement effective backwash cycle procedure. Consider: timing of air scour, settling and water wash turbidity criteria set for protocol before putting filter back in service a log to record identified problems, and what was done to rectify them optimisation of the filter ripening operation. Aluminium residual Filter log. Frequent backwashes. Mud-balls and/or cracks in filters. Boil-up and/or dead during backwash. Loss of media. Change procedure for backwash cycles. Make sure operators are trained in correct maintenance and operation procedures for the specific filters in use. Identify staff training needs and provide training. P6.1.1.4 Inadequate filter Develop and use pump maintenance schedule. Schedule should follow manufacturer’s recommendations and include: lubrication; replacement cycle for elastomeric components (eg, flexible couplings) component inspection (valves, pumps, compressors etc) inspection logbook. Maintenance log book (see also P6.1.1.3). (See also P6.3.1.3.) Increase frequency of media and filter inspection if excess residual coagulant detected in the treated water. Inspect and chemically clean media at least annually. Ensure operators are trained in correct maintenance procedures for the specific filters in use. Start chemical cleaning programme. Identify staff training needs and provide training. Event: NATURAL ORGANIC MATTER NOT REMOVED Possible hazards: Germs; disinfection by-products (trihalomethanes, haloacetic acids, chloral hydrate (chlorine), chlorite (chlorine dioxide), bromate, bromoform, formaldehyde (ozone)). Level of risk: Moderate1
treatment-rapid-sand-filtration-feb14-v2.docx