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Wastewater Division

Wastewater Plant Update

Posted: January 6, 2009

Update December 2008: (Click on thumbnails to view pictures larger)

Influent Pump Station (IPS) After some final details connecting discharge piping to the IPS pumps, a temporary loop of piping was set up to send water (reclaimed water, not sewage) back from the new secondary clarifiers to the IPS for the IPS pumps to send through the grit treatment unit and the oxidation ditches then on to the secondary clarifiers again. This water loop testing is required in the construction contract to demonstrate the new facilities meet operational requirements.

Click here to see a video of the
temporary water loop discharge

IPS Pump Discharge Header

Temporary Discharge
Piping to IPS Wetwell

Oxidation Ditches (ODs) In November, the ODs starting filling with reclaimed water. Once full, the propeller mixers and recirculation pumps were placed in service as part of the water loop operational testing procedure. Some final detail work was completed on the OD aeration blowers, such as installation of blower and air piping insulation.

OD Propeller Mixers
(as installed in July)

Aerated Water
Circulating in OD
OD Aeration
Diffuser Areas
OD Blowers with Insulation

Secondary Clarifiers A temporary pump station was set up to suck the water from the secondary clarifiers and return it to the IPS for recirculation.

Temporary Suction Piping
(2 white vertical pipes)
and Portable Pumps
(green units)

Grease Receiving Station Concrete Slab Pour
Completed Grease
Receiving Station

Solids Handling The grease and scum from the secondary clarifiers will be pumped to the 2 Dissolved Air Floatation Thickeners (DAFTs). Quite a bit of work was completed at these units in December including completion of the area concrete slab and installation of the associated equipment. Roofs were installed on the circular tanks to capture and control any odors which may be generated in these units. This “foul air” will be removed by blowers and diffused through a scrubbing media. The material of the media is wood chips and compost which promotes the growth of an odor removing bacterium.

DAFT Area Slab
DAFT Air Saturation Tank
DAFT Pressurization Pumps

DAFT Tank Roof
Foul Air Blower
Foul Air Biofilter
(without media)

Secondary Effluent Equalization Pump Station (SEEPS) When the plant flow is normal (without all the temporary water recirculation loops for testing), the water leaving the secondary clarifiers will flow to an equalization tank for temporary storage of each day’s peak flow. After the peak flow has diminished to lower flows, this stored peak water will be pumps out of the tank by the SEEPS. Much work was completed in December on this SEEPS structure including construction of the pump station’s top slab and the installation of a retaining wall.

SEEPS Top Slab Concrete Pour

Concrete Finishing Work SEEPS Top Slab
SEEPS Retaining Wall
SEEPS Pumps Electrical Equipment Installed

Power and Controls The electrical subcontractor was very busy pulling power and control wires throughout the project site. Some finishing work such as installation of lighting around units and roads was also completed.

Pulling Wire from Admin Building to Filter/UV Building

Miscellaneous Some smaller items were completed, for example the installation of the pumps for the plant’s new second storm water pump station and installation of some channel grating. Also, work continued on the site final grading in preparation for road paving scheduled for early 2009. Training in December was a little reduced due to the holidays, but Staff did learn about some new equipment such as the submersible solids-pumping secondary scum/grease pumps.

Storm Water Pumps
Concrete Apron for
New Roadway
Grading for Pavement
Near Grit Unit

Submersible Pump Training
OD Inlet Channel Grating and Protective Bollards

Check back again in February to see what happened in January.

Update December 2008: (Click on thumbnails to view pictures larger)

Influent Pump Station (IPS) After some final details connecting discharge piping to the IPS pumps, a temporary loop of piping was set up to send water (reclaimed water, not sewage) back from the new secondary clarifiers to the IPS for the IPS pumps to send through the grit treatment unit and the oxidation ditches then on to the secondary clarifiers again. This water loop testing is required in the construction contract to demonstrate the new facilities meet operational requirements. Click here to see a video of the temporary water loop discharge		IPS Pump Discharge Header Temporary Discharge Piping to IPS Wetwell

Oxidation Ditches (ODs) In November, the ODs starting filling with reclaimed water. Once full, the propeller mixers and recirculation pumps were placed in service as part of the water loop operational testing procedure. Some final detail work was completed on the OD aeration blowers, such as installation of blower and air piping insulation.		OD Propeller Mixers (as installed in July)
Aerated Water Circulating in OD	OD Aeration Diffuser Areas	OD Blowers with Insulation

Secondary Clarifiers A temporary pump station was set up to suck the water from the secondary clarifiers and return it to the IPS for recirculation.		Temporary Suction Piping (2 white vertical pipes) and Portable Pumps (green units)
Grease Receiving Station Concrete Slab Pour	Completed Grease Receiving Station

Solids Handling The grease and scum from the secondary clarifiers will be pumped to the 2 Dissolved Air Floatation Thickeners (DAFTs). Quite a bit of work was completed at these units in December including completion of the area concrete slab and installation of the associated equipment. Roofs were installed on the circular tanks to capture and control any odors which may be generated in these units. This “foul air” will be removed by blowers and diffused through a scrubbing media. The material of the media is wood chips and compost which promotes the growth of an odor removing bacterium.
DAFT Area Slab	DAFT Air Saturation Tank	DAFT Pressurization Pumps
DAFT Tank Roof	Foul Air Blower	Foul Air Biofilter (without media)

Secondary Effluent Equalization Pump Station (SEEPS) When the plant flow is normal (without all the temporary water recirculation loops for testing), the water leaving the secondary clarifiers will flow to an equalization tank for temporary storage of each day’s peak flow. After the peak flow has diminished to lower flows, this stored peak water will be pumps out of the tank by the SEEPS. Much work was completed in December on this SEEPS structure including construction of the pump station’s top slab and the installation of a retaining wall.		SEEPS Top Slab Concrete Pour
Concrete Finishing Work SEEPS Top Slab	SEEPS Retaining Wall	SEEPS Pumps Electrical Equipment Installed

Power and Controls The electrical subcontractor was very busy pulling power and control wires throughout the project site. Some finishing work such as installation of lighting around units and roads was also completed.		Pulling Wire from Admin Building to Filter/UV Building

Miscellaneous Some smaller items were completed, for example the installation of the pumps for the plant’s new second storm water pump station and installation of some channel grating. Also, work continued on the site final grading in preparation for road paving scheduled for early 2009. Training in December was a little reduced due to the holidays, but Staff did learn about some new equipment such as the submersible solids-pumping secondary scum/grease pumps.
Storm Water Pumps	Concrete Apron for New Roadway	Grading for Pavement Near Grit Unit
	Submersible Pump Training	OD Inlet Channel Grating and Protective Bollards

Check back again in February to see what happened in January.