Latest News

Press Release – NEWEA Award

Greater Lawrence Sanitary District Earns 2020 Energy Management Achievement Award from New England Water Environment Association – To read the article, click here.



Putting the principles of sustainability and resiliency into practice—GLSD’s organics to energy project

NEWEA article on GLSD’s organics to energy project. To read the article, click here.

GLSD featured in Wentworth Institute of Technology Magazine

GLSD featured in Wentworth Institute of Technology Magazine. To read the article, click here.

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The Operations Department is responsible for all aspects of the wastewater operation at the facility. The plant is staffed 24/7.

The operations department schedules and plans all tours. They also work with any students who are looking for influent, effluent, or sludge to analyze.



Process Information

Licensed wastewater operators constantly check the operations of the plant, and keep watch over the plant’s equipment. These systems provide real-time information on the status of many areas and operations in the wastewater treatment plant and main pumping station.

Sludge Thermal Drying Facility

In 2002, GLSD selected The New England Fertilizer Company (NEFCO) to permit, build and begin managing the biosolids drying and pelletizing facility at GLSD. The facility produces Class A slow-release fertilizer which is used at GLSD and sold to local farms. NEFCO uses digester gas to fuel the facility’s dryers instead of fossil fuels, saving the District $600,000 a year.

In 2018, as required by Massachusetts procurement laws, the District formally advertised for the Biosolids Drying Facility Operations Services contract. A RFQ/P was issued in May 2018. In August 2018 the contract was awarded to Synagro Inc. of Baltimore, Maryland.

The Process

The facility at GLSD has the capacity to take in 152 wet tons per day and produce 38 dry tons a day. The fertilizer is created by taking sludge (a mixture of water, organic solids, and mineral solids) that comes from settling mechanisms in the wastewater treatment process. The sludge is dewatered and dried in a rotary dryer, which Synagro uses to create a uniform end product.

The exhaust gas is processed before it is vented outside. First, it passes through a scrubber and condenser to remove any remaining solids and then through a Regenerative Thermal Oxidizer to remove odors. Additionally, an Odor Scrubbing System is used to remove odors from the building.

To learn more about Synagro and their process, visit