Latest News

Regulatory support letters for GLSD’s Organics to Energy Project

Greater Lawrence Sanitary District received the following support letters for the Organics to Energy Project. MassDEP Cambridge City Council letter 10-5-18 EPA letter to Cambridge 10-5-18


5/23/18 WM Core – Process Managing Organic Waste

Explanatory Video


GLSD – Organics to Energy, Phase II Digester Project

08/02/2017 Aerial Progress Video


Earth Day 2016

GLSD Honored for Saving $1 Million Dollars and for Implementing an Organics to Energy Program On Earth Day 2016, the Massachusetts Department of Environmental Protection (MassDEP) honors the Greater Lawrence Sanitary District (GLSD) for its $1 million dollar energy savings


GLSD Dedicated New CSO Facilities

Robert Varney, EPA Regional Administrator and Richard Hogan, GLSD Executive Director CSO Dedication Ceremony After the formal ceremony attendees were given tours of the new facilities. North Andover, MA – On September 26, 2007 the Greater Lawrence Sanitary District dedicated



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