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Lir Treatment of lignocellulosic agricultural byproducts such as grass and leaves with alkaline hydrogen peroxide (1,2) has been shown to greatly increase susceptibility of cell wall carbohydrates in these materials to digestion by cellulolytic microorganisms such as those in the ruminant gut (3). It is believed that feeding studies with sheep and cattle will demonstrate that alkaline hydrogen peroxide treatment will increase the digestibility of waste material to a level comparable to that observed for cereal grains, allowing use of waste as a major component in ruminant diets for growth and production (3-5). The possibility of utilizing suitably treated lignocellulose as an efficient ruminant feed could have major impact on livestock production practices in areas where supplies of indigenous lignocellulose are abundant and where cereal grain supplies are limited or are utilized primarily for human food (6) . tr, Previous studies of alkaline hydrogen peroxide treatment focused on the treatment's effects on lignocellulose composition and digestion/fermen- tation properties, with little attention paid to economic or scale-up considerations. In those studies (1-5), we employed a batch, wet-slurry process in which straw was suspended in water (typically 40-100 g straw/1) containing hydrogen peroxide (10 g/1), and the slurry pH was adjusted to 11.5. The high levels of hydrogen peroxide (250 g/kg straw), loss of po- tentially fermentable carbohydrates (2,7), and the liquid waste stream represent economic obstacles that must be addressed by any commercial implementation of this technology for the production of a low value pro- duct such as ruminant animal feed.