Some of Northern Tilth’s projects include:

Residential and Commercial Organic Waste Stream Characterization

California Client.   Northern Tilth developed a sampling and analytical plan and performed sampling and chemical and physical characterization of an organic waste stream mechanically separated from MSW post-collection.  Characterization was used to determine potential recycling options (including composting and anaerobic digestion) for this organic waste stream.

Manufactured Topsoil Recipe Development for Slag Heap Reclamation Project

Midwest Client.  Northern Tilth worked with client to develop a topsoil blend consisting of steel slag residue and food waste/yard waste compost for establishing a long-term grass ecosystem to act as a vegetative cover for a 60-acre slag heap.

Development of a Web-Based Greenhouse Gas Emissions Calculator

Agri-Cycle Energy, New England.  Northern Tilth worked with Agri-Cycle to develop a web-based greenhouse gas emissions calculator that provides carbon accounting for recycling food waste through Agri-Cycle Energy’s innovative collections and anaerobic digestion program.


Chicken Manure Composting Technical Services and Resource Management Planning

Pete & Gerry’s Organic Eggs, New Hampshire.   Recipe development for chicken manure composting operation for New England’s largest producer of organic eggs.  Recipe maximizes use of by-products generated on the farm and other low cost feedstocks in order to generate a high value finished compost for use in organic agriculture.  Northern Tilth also provided long-term chicken manure management planning to determine the most cost-effective approach to integrating both a land application program and a composting program for the material.


Nutrient Management Planning and Fertigation Development

Richardson’s Dairy, Massachusetts.  Developed a plan to improve soil fertility balance and soil health using a combination of dairy manure, process water from the ice cream production facility and compost on all of the fields managed by one of New England’s premier ice cream producers.


Food Processing Digestate Characterization

Provided a comprehensive soil amendment characterization of an anaerobically digested food processing by-product.  The study included a determination of nitrogen mineralization rates, phosphorus and potassium availability and the impact of the digestate on soil pH, organic matter and plant micro-nutrients.  Results of the study are being used to refine application rates for the 15,000 cubic yards of digestate that is applied to agricultural soils.

Development of Digestate Land Application Program

Village Green Ventures, Brunswick, Maine.  Northern Tilth provided permitting, nutrient management planning and compliance services in the development of an agricultural land application program for digestate from an anaerobic digester that is deriving energy from wastewater solids and food waste in order to provide electricity for an industrial park at a former naval air station.

Design, Planning and Grant Procurement for Dairy Manure Composting Operation

Otter River Farm, Winchendon, MA.  Worked with Otter River Farm to design a 10,000 ton per year covered composting operation.  Successfully procured  grant money from the USDA NRCS and Massachusetts Department of Agricultural Resources for the farm to help build and cover the facility.  Converted the existing windrow composting operation to aerated static pile composting to reduce the footprint of the facility, helping to improve surface water quality and reducing compost processing time.

Phosphorous Run-Off Reduction Field and Bench-Scale Trials

In collaboration with RMI and with the support of a grant from the USDA’s Conservation Innovation Grants program, Northern Tilth has initiated field trials on farms in Vermont and New Hampshire investigating the potential use of Water Treatment Residuals (WTRs) to reduce phosphorus run-off from agricultural soils.  The study includes a complimentary bench-scale trial using soil incubations of WTR/soil blends to more precisely characterize the soil phosphorus reactions with WTRs.  As a final deliverable for the project, Northern Tilth will be developing best management practices for the use of WTRs to reduce soil phosphorus run-off.

Biochar Bench-Scale Soil Fertility Study

Conducted a bench-scale soil incubation study for RMI in Holderness, NH, investigating the biochar-like properties of a high carbon ash material.  The study included nitrogen mineralization determinations and plant growth trials.

Conversion of Disturbed Land to Agricultural Land Using Residuals

Northern Tilth has been working extensively with Resource Management, Inc. of Holderness, NH to develop and improve the quality of topsoils manufactured from paper mill residuals and otherwise low-value sand to re-vegetate disturbed land.  Most recently, these topsoils have been used to convert barren land into productive hayfields.  In addition to creating agricultural land from formerly disturbed land, these projects sequester greater than 40 tons of carbon per acre.

Reclamation afterReclamation before

Organics Recycling Feasibility Study

2013-07-08 12.55.20In association with Coker Composting & Consulting, Integrated Waste Management Consulting and Tech Environmental, Northern Tilth completed an organics recycling feasibility study investigating collections, processing and marketing for residential and commercial source separated organics (SSO) for ecomaine, a solid waste agency serving over 40 communities in southern Maine.

Greenhouse Gas Emissions Accounting for Biosolids Management Programs

Northern Tilth collaborated with the Canadian residuals recycling firm Sylvis, Professor Sally Brown from the University of Washington and the North East Biosolids and Residuals Association (NEBRA) in developing a biosolids management greenhouse gas emissions calculator for the Canadian Council of the Ministers of the Environment.  The calculator assesses greenhouse gas emissions from all aspects of biosolids handling including anaerobic digestion, thermal drying, alkaline stabilization, incineration, composting and landfilling.

Spent Seaweed By-Product Recycling

Northern Tilth completed two years of agricultural and topsoil blending field trials for FMC BioPolymer, a carrageenan manufacturing plant that generates 23,000 tons per year of Algefiber, a spent-seaweed by-product.  Prior to Northern Tilth’s work, all of the Algefiber was disposed in a local landfill. Based on the field trials and extensive materials characterization, Northern Tilth permitted and initiated a recycling program that currently handles 100% of the material.

truck dumping residualshand in clover-grass

Wood Yard Revegetation Project with Paper Mill Residuals

Northern Tilth developed recipes and obtained regulatory approval for a Canadian paper mill working to revegetate a relict wood yard using a manufactured topsoil blend consisting entirely of residuals generated by the mill. The woodyard consisted of compacted sub-soil, incapable of supporting vegetative cover.  The area created a dust hazard in dry times of the year.  By-products in the topsoil include paper mill sludge (short paper fiber), ash from the mill’s biomass plant, and partially decomposed wood from old hog fuel piles.  Northern Tilth oversaw blending and topsoil placement operations.  A robust self-sustaining grass/clover ecosystem was established within the first field season after topsoil placement.

wood yard afterwood yard before

Seaweed Processing By-Product Use as Road De-Icing Agent

image4Permitted and implemented a pilot program using seaweed shakings as a substitute for road salt in sand/salt blends for road de-icing projects in Maine.

Development of a Water Treatment Residuals Recycling Program

Based on field trials, Northern Tilth demonstrated that the Kennebunk, Kennebunkport and Wells Water District’s water treatment residual could be successfully used as the mineral component in manufactured topsoil. Northern Tilth obtained the first water treatment residual recycling permit issued by the Maine Department of Environmental Protection. Northern Tilth continues to work with the water district in developing topsoil blends that are used by local contractors to improve the qualities of commercial topsoil.

WTR field trialWTR lagoon - alligatored

Nutrient Management Planning for Integrated Dairy

Northern Maine.  Completed a Comprehensive Nutrient Management Plan for one of the largest dairies in northern Maine.  Elements of the planning included crop rotations, reducing water quality risks through the use of a phosphorus index tool and providing for manure applications to precisely match crop needs in order to minimize the need for importing supplemental crop nutrients.