Search PubMed⌕ Search

Biomedical subjects

M P Henry

Publications and source records attributed to M P Henry.

6 recordsLinked to original sources
PubMed2001

Rapid-rate thermophilic, single-stage and two-phase methane fermentation of synfuel-industry wastewaters.

Thermophilic (55 degrees C) anaerobic digestion of wastewaters from wet carbonization of Minnesota peat was conducted in a simple, upflow digester at an HRT of one day to provide a methane yield of 0.20 SCM/kg VS added and a BOD5 reduction of 85%. Carbonization of Maine peat conducted for a much longer duration of thermal treatment produced recalcitrant and potentially toxic end products that reduced the biodegradability of wastewaters. Methane fermentation of the Maine-peat wet-carbonization waste was inhibited at an HRT of one day in the single-stage digester. However, two-phase digestion with separate acid-phase fermentation to promote hydrolytic degradation of toxic end products followed by separate methane fermentation at an HRT of 2 days exhibited a methane yield of 0.21 SCM/kg VS added and a BOD5 reduction of 76%. Volatile fatty acids profiles along the depths digesting cultures indicated that single-stage and two-phase digestion could be accomplished at one-half the reactor residence times (one day for single-stage and three days for two-phase) used in this research.

Conservation of Natural Resources↗
PubMed2000

Characteristics of particle-loaded monolithic sol-gel columns for capillary electrochromatography. I. Structural, electrical and band-broadening properties.

Particle-loaded (3 microm, C18) monolithic sol-gel columns have been prepared and selected characteristics measured. They have a surprisingly high permeability, allowing their operation in the microLC mode at pressures as low as 69 kPa where their efficiency is about 50000 plates per meter and the CEC mode where efficiency is at least 106000 plates per meter. These columns can withstand over 13.8 MPa pressure without compression or movement within the 75 microm capillary. Field strengths in the packed segments are approximately 50% greater than those in the open segments, due to the higher resistivity of the particle-laden regions. There is a relatively rapid loss of efficiency with increasing linear velocity in both the CEC and microLC modes, which may be due to a tortuosity effect in the inter- and intra-particulate voids. Chromatographic behavior is characteristic of conventional C18 particles, indicating that analytes have significant access to the surface within the pores of the immobilized bonded phase.

Electricity↗
PubMed2000

Pilot-scale gasification of municipal solid wastes by high-rate and two-phase anaerobic digestion (TPAD).

Bioconversion of municipal solid waste-sludge blend by conventional high-rate and two-phase anaerobic digestion was studied. RDF (refused-derived fuel)-quality feed produced in a Madison, Wisconsin, USA, MRF (materials-recovery facility) was used. High-rate digestion experiments were conducted with bench-scale digesters under target operating conditions developed from an economic feasibility study. The effects of digestion temperature, RDF content of digester feed, HRT, loading rate, RDF particle size, and RDF pretreatment with cellulase or dilute solutions of NaOH or lime on digester performance were studied. A pilot-scale two-phase digestion plant was operated with 80:20 (weight ratio) RDF-sludge blends to show that this process exhibited a higher methane yield, and produced a higher methane-content digester gas than those obtained by single-stage, high-rate anaerobic digestion.

Bacteria, Anaerobic↗
PubMed1972

[Porphyria].

Explore the source record for details and available documents.

Humans↗