Since the Sludge Or Wastewater from Water Treatment Plants Is Not
The Study On The Master Plan Of Greater Phnom Penh Water Supply (Phase 2) Since the sludge or wastewater from water treatment plants is not hazardous or harmful to human health, it is recommended to discuss with the Ministry of Environment and obtain permission to continue directly discharging wastewater from the existing water treatment plants. 7-3 Rehabilitation Works Water treatment plants consist of concrete structures, piping, mechanical equipment, electrical equipment, instrumentation etc. Usually, concrete structures and piping last 30 to 50 years while mechanical equipment, electrical equipment and instrumentation deteriorate over a shorter period, such as 10 to 20 years. Also, the equipment requires replacement of certain spare parts as annual maintenance, and major rehabilitation entailing overhaul/repair/replacement of equipment every decade or so. These costs should be recognized as regular O&M cost in the annual operating budget. Several O&M budget items should be considered for a water treatment facility. These items include staffing, chemicals, utilities, ongoing training, and equipment. Equipment costs should be budgeted over several separate categories. Smaller new equipment will be purchased during the operation of the facility to replace broken equipment, add new types of equipment, and to upgrade the facility. These costs tend to increase with the age of the plant. There should be a spare parts category in the budget to cover costs of maintaining an inventory of critical and hard-to-locate parts. Another budget category is consumables necessary to keep equipment in operation, such as oil, grease, nuts, and bolts. Finally, although some tools will be initially purchased, a budget allowance should be included for constantly replacing and upgrading the tools required for plant maintenance.
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