Construction, Operation and Maintenance Aspect

CONSTRUCTION, OPERATION AND MAINTENANCE ASPECT

Maintenance Scheduling

* Maintenance of each equipment is done as the recommendations of manufacturer.

* A History card is maintained for each equipment so that record is maintained for equipment performance and maintenance.

* Good housekeeping is an important aspect of plant operation.

Pumping Machinery

• To run the machinery in a way so as to have free fall from invert of sewer.

• Mostly 2 or 3 pump sets are out of order.

• Minimum one pump be operated during night hours so that sewers are empty in morning.

Screening Chamber & Wet Well

• Regular Cleaning

• Disposal of Screenings

• Washing of Bar Screens

• Washing sludge layer from walls using waterjet

• Desilting of wet well once a year.

Cleaning Chamber & Fine Screens

• Should be scoured minimum once in a week.

• Fine Screens should be kept clean of all obstructions. If the screen are of mat typ

its operation should be adjusted such that a mat is always on the screen.

Grit Channel

• (1W+18) grit channels for peak flow.

• Should be used one at a time, alternatively everyday.

• Should be cleaned everyday.

• Proper & efficient removal of silt in grit channel will improve the functioning treatment.

Proportional Weir

• It is provided to maintain uniform flow on upstream and downstream of gritchann

• Must be calibrated so as to show the quantity offlow.

• Flow be recorded every hour. In SBR Plants the flow recording graphs are recor in SCADA

Distribution Channel

• Must be cleaned every day.