Editor's comment

I. Simeonov                   3

I. SUBSTRATES AND MAIN TECHNOLOGICAL FACTORS

Potential for biogas production from food industry and stock-breeding

D. Denchev, P. Angelov, L. Tomov, N. Nikolov      5

Microbiology and biochemistry of methanogenesis

A. Kenarova, K. Georgiev                                   12

II.                EXPERIMENTAL STUDIES IN BULGARIA

Biogas production from organic wastes in laboratory pseudohomogeneous bioreactors

I. Simeonov, S. Mihajlova, A. Mirkov, I. Petkov, E. Chorukova                                  23

Study of the qualities of compost as an alternative of high energy consuming fertilizers.
Ecological assessment of the toxic elements content in compost

B. Baykov, J. Petkov, K. Kirov, B. Zacharinov, N. Marinova, I. Popova                      33

Assessment of cattle and swine dung as a substrate for anaerobic digestion

D. Denchev, V. Hubenov, S. Boneva, S. Mihajlova, P. Lazarova                              37

III.               EXPERIENCE FROM ABROUD

Biogas, ecology and common agricultural policy – Swedish experience

L. Tomov, P. Angelov                            43

Danish experience in the field of biogas technologies

I. Simeonov, K. Velev                            52

Techno-economic analyses of biogas plants

K. Velev                                               59

Workshop on biogas and other regenerative energy sources

L. Nikolov                                             71

Workshop “development of advanced technologies for heat and electro energy production from organic waste”

P. Angelov, S. Mihailova                         75