Operation, maintenance and rehabilitation techniques

A systematic operation, maintenance, and rehabilitation program is an essential element in the management of a wastewater collection system. Effective inspection, cleaning, and rehabilitation are key processes for optimizing the proper functioning of a collection system. 7-1 7.1 Methods and Equipment The following information outlines the methods and equipment frequently utilized to inspect and clean gravity collection systems and pumping stations. Frequent inspection and cleaning is essential for normal functioning and problem identification. Information is also presented regarding spare parts and equipment necessary for effective operation. 7.1.1 Gravity Collection Systems Physical Inspection A physical inspection is vital to an O&M program. Without it, a maintenance program cannot be implemented in a systematic way since system problems cannot be quantified. Elements of a physical inspection program include visual and equipment-based techniques that use established industry methods of system evaluation. Physical inspections should be performed on a regularly scheduled basis as a part of the preventive maintenance program. The purpose of conducting inspections is to: • Identify what is in the system (inventory). • Identify the location of the system's components. • Determine the condition of the components (assessment). • Prevent problems from developing. Before acceptance of a newly constructed collection system, O&M personnel should conduct a physical inspection to verify the accuracy and completeness of the record drawings. Inspection before acceptance will also ensure that the new components are clear of construction debris and rocks.