Lynn Wastewater Treatment Plant

2 Circle Avenue, Lynn  MA 01905    USA  tel 781-592-7048

Introduction

• Introduction
• World Wastewater History
• Lynn Wastewater History
• Preliminary Treatment
• Primary Treatment
• Secondary Treatment
• Chlorination
• Water Quality ( Plant Specifications and Results )
• Solids Handling
• Incineration
• Back to Home Page

What is wastewater?

Wastewater is the used water and solids from a community that flows to a treatment plant. Storm water, surface water and groundwater may infiltrate into the underground pipes, through cracks, joints or storm drains in the case of combine sewer system (in a combined sewer system both rain water and sanitary sewers combine together to go to the treatment plant). Each person typically uses about 80 gallons of water per day. Treatment plants are not designed to remove all possible wastes from a wastewater flow. Industries that produce incompatible wastes pretreat their waste to make it compatible before sending the wastewater to the treatment plant.

Introduction To The Lynn Wastewater Treatment Plant

The Lynn Regional Wastewater Treatment Facility is currently a primary and secondary treatment plant with a design purpose of the primary to remove Settleable and floatable material (sludge, grease, etc.). The secondary treatment is directed principally toward the removal of biodegradable organic and suspended solids. Under optimum operating conditions the facility should remove a minimum of eighty-five percent (85%) of the Influent total suspended solids and eighty five percent (85%) of BOD5. The plant has been designed to handle flows averaging 25.8 million gallons per day during dry weather periods. During wet weather conditions, the plant can treat as much as 110.8 million gallons per day of sewage flow and storm flow.

The Lynn WWTP receives flows from four communities; the City of Lynn, and the Towns of Saugus, Nahant and Swampscott. Saugus, Swampscott and Nahant deliver flow to the facility via three force mains; two 30 inch and an 18 inch, respectively. The Lynn flow goes through preliminary treatment through barsceens and  afterwards is then combined with the other comumities where is passes through aerated grit chambers. Primary clarifiers then remove settleable pollutants. Non-settlable pollutants pass to secondary treatment where microorganisms help to remove non settleable pollutants. Chlorine is used to disinfect the treated water before it is discharged out into the harbor.

The solids or sludge produced by the removal of pollutants through primary and secondary treatment, go through a solids dewatering process and are both incinerated on site and removed to a remote location for either composting, land application, incineration or placed in a landfill.

BASIC DESIGN DATA

#	DESCRIPTION	VOLUME EACH (MGD)	DIMENSIONS	SURFACE AREA sq. ft.	OTHER
	INFLUENT
2	LYNN INFLUENT PUMPS				150 HP 15 MGD
3	LYNN INFLUENT PUMPS				300 HP 30 MGD
	PRELIMINARY TREATMENT
3	AUTOMATIC BAR SCREENS
2	SCREENINGS GRINDERS
2	ROTARY FINE SCREENS
1	SCREENINGS EJECTOR			20 cu. ft.	1848 DRY LBS/DAY
4	AERATED GRIT CHAMBERS		32.5 X 19 X 14.5 D	617.5	10965 DRY LBS/DAY
2	GRIT EJECTORS
	PRIMARY TREATMENT
5	PRIMARY CLARIFIERS	.724	220 X 40 X 11 D	8800
	SECONDARY TREATMENT
3	3 STAGE AERATION BASINS	.835	150 X 50 X 15 D	7500
3	MECHANICAL MIXERS				50 HP
6	MECHANICAL MIXERS				30 HP
1	PRESSURE SWING ADSORPTION OXYGEN GENERATOR				26 TONS O2/DAY
3	COMPRESSORS ( for O2 generation )				400 HP
2	LIQUID OXYGEN TANKS	.009
4	SECONDARY CLARIFIERS	1.600	140 0 X 14	15394
	DISINFECTION
3	CHLORINE CONTACT BASINS
4	CHLORINATORS				0-1000 LBS/DAY
3	EFFLUENT PUMPS				600 HP OCEAN DISCHARGE
2	EFFLUENT PUMPS				400 HP OCEAN DISCHARGE
	SOLIDS PROCESSING
2	SLUDGE THICKENERS	.035	50 0 X 12	1950
2	SLUDGE HOLDING TANKS	.059	22 0 X 20
4	DIAPHRAGM FILTER PRESS
	INCINERATION
2	FLUIDIZED BED INCINERATORS				1056 DRY LBS/HR
1	FUEL OIL TANK	( under ground ) .020
	EMERGENCY POWER
4	EMERGENCY TURBINE GENERATORS				800 KW
1	FUEL OIL TANK	( under ground ) .015

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