Effects of Wood Chips Types and Mixing Ratio to the Compression Characteristics of Steelmaking Slag Mixed with Wood Chips

Biofilter media mixtures were compared in 18 pilot-scale biofilters treating pit gases from a swine facility. The compost and wood chips mixtures ranged from 100% wood chips to a 50-50 blend in 10% increments. The effect of three media moisture contents (low, medium, and high) on biofilter performance was also evaluated. Odor and hydrogen sulfide reduction did not change significantly for mixtures with greater than 20% compost. For efficient odor, hydrogen sulfide, and ammonia reduction media moisture must be greater than 40% wb. Media moisture content influenced odor, hydrogen sulfide, and ammonia reduction more than the ratio of compost and wood chips. The count of heterotrophic or sulfur-oxidizing bacteria did not change in a discernable pattern with respect to media mixture or moisture content. As the amount of compost increased in the media mixtures, the pressure drop also increased. Based on this experiment, the recommended mixing ratio of compost to wood chips for biofilters on swine facilities is minimum 30% compost and 70% wood chips by weight.

Download Full-text

MATHEMATICAL MODELING OF THE HEATING OF THE WATER DROPLETS WHEN DRIVING IN CONDITIONS OF COOLING OF STEELMAKING SLAG FIELD

Cherepovets State University Bulletin ◽

10.23859/1994-0637-2017-2-77-6 ◽

2017 ◽

Vol 2 (77) ◽

Author(s):

N.N. Sinitsyn ◽

D.S. Revyakina ◽

D.S. Prokopeva ◽

A.A. Kostyleva ◽

V.V. Plashenkov

Keyword(s):

Mathematical Modeling ◽

Steelmaking Slag ◽

Water Droplets

Download Full-text

Storage Problems of Poplar Chips from Short Rotation Plantations with Special Emphasis on Fungal Development

Acta Silvatica et Lignaria Hungarica ◽

10.2478/v10303-012-0010-7 ◽

2012 ◽

Vol 8 (1) ◽

pp. 123-132 ◽

Cited By ~ 9

Author(s):

Zsuzsanna Horváth ◽

Béla Marosvölgyi ◽

Christine Idler ◽

Ralf Pecenka ◽

Hannes Lenz

Keyword(s):

Particle Size ◽

Health Risk ◽

Dry Matter ◽

Ph Value ◽

Wood Chips ◽

Raw Material ◽

Special Focus ◽

Fungal Development ◽

Short Rotation ◽

Fungal Particles

Abstract - There are several problems in storing wood chips freshly harvested from short rotation plantations, which result in quality losses as well as in dry matter and energy losses. The factors influencing the degradation of raw material are examined in this paper with special focus on fungal development. An excessive growth of fungi is connected to dry matter losses and also to an increased health risk during raw material handling. The following factors were measured during 6 months storage of poplar wood chips depending on particle size: box temperature, moisture content, pH-value, appearance of fungi in the storage and the concentration of fungal particles in the air. The results show a close connection between particle size, temperature and attack of fungi. During the storage mesophilic and termophilic species of the genera Alternaria, Aspergillus, Cladosporium, Mucor and Penicillium appeared. The concentration of fungal particles is the highest for fine chips and decreases in bigger particles. There was a special focus on the investigation of the properties of coarse chips (G 50), which represent a good compromise between handling, storage losses and health risk due to fungal development.

Download Full-text