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forest residuals

Wood-to-alcohol conversion technology suitable for a pulp mill retrofit

Schematic of mild bisulfite pretreatment process. Courtesy of Junyong Zhu at USDA Forest Service, Forest Products Laboratory.
Schematic of mild bisulfite pretreatment process. Courtesy of Junyong Zhu at USDA Forest Service, Forest Products Laboratory.

Building a biorefinery to convert wood residues into chemical products like biojet fuel is expensive. The projected capital investment exceeds $850 million. An alternative, and potentially less costly approach, …more

Determining soil nitrogen content in working forests

Data probes in deep soil
Data probes in deep soil

Trees need nitrogen to grow. If soil nitrogen levels are low, then growth is limited. The ability to accurately monitor the amount of soil nitrogen in a working forest is helpful for predicting future growth and for knowing when to take corrective action (fertilizer, altered management practices) when soil nitrogen levels decline.

Efforts to …more

Determining CO2 emissions over time

Representation of carbon balance in the working forest. Image contained in paper:
Representation of carbon balance in the working forest. Image contained in paper:

The USDA-NIFA, through NARA, funds research to determine the environmental impact from a wood-based biofuel and chemical industry. To gauge how this industry would affect greenhouse gas (GHG) levels, a life cycle assessment (LCA) is being developed. In this …more

Packing forest residues for transport

Vertical blowing of forest residuals
Vertical blowing of forest residuals

Transporting a low value product like forest residuals from a timber harvest site to a processing facility represents a significant economic and logistical challenge for a wood to biofuel supply chain. One way to ensure that transport costs are as low as possible is to maximize the amount of wood residuals carried per trailer …more

NARA’s 2014 peer-reviewed publications

Journals with 2014 NARA publications
Journals with 2014 NARA publications

In 2014, NARA researchers published 25 papers in peer-reviewed journals. These publications help transfer NARA research to a wide audience. Here is a brief narrative to how these peer-reviewed papers complement NARA’s goals and contribute towards evaluating the use of forest residuals as a feedstock to produce chemical products.

NARA goal 1: …more

NARA webinar: facility site selection for the Pacific Northwest

Gloves on machine

The IDX team at Washington State University has been tasked with evaluating the NARA 4-state region (ID, MT, WA, OR) to determine optimal locations for infrastructure to support a wood residual to biojet fuel and co-product supply chain. In the previous webinar, the region was evaluated based on regional assets leading to 35 potentially viable sites. This webinar will continue the previous work by providing …more

Collecting, processing and transporting forest residuals at the lowest cost

Image from paper showing potential transport and processing choices.
Image from Zamora-Cristales et al. (2014) paper showing potential transport and processing choices.

One of the biggest economic challenges to using forest residuals as a feedstock for biofuel production is the cost of residue collection, processing and transport. Based on NARA’s preliminary analysis, nearly 18% of the manufacturing cost for biojet fuel is associated …more