Presence of Siloxanes in the Biogas of a Wastewater Treatment Plant Separation in Condensates and Influence of the Dose of Iron Chloride on its Elimination

The siloxanes present in the biogas produced during anaerobic digestion damage the mechanism of cogeneration equipment and, consequently, negatively affect the energy valorization process. For this reason, the detection and elimination of these silicon-derived chemical compounds are a priority in the management of cogeneration facilities. In this regard, the objectives of this paper are, firstly, to characterize the siloxanes in the biogas and, secondly, to qualitatively evaluate the influence of the dose of iron chloride on its elimination. The research was performed at the Rincón de León Wastewater Treatment Plant (Alicante, Spain). The outflow biogas of the digesters and of the pressurized gasometers was sampled and analyzed. The results obtained made it possible to demonstrate, firstly, the absence of linear siloxanes and that, of the cyclic siloxanes, the predominant type was decamethylcyclopentasiloxane, and, secondly, that the addition of iron chloride in the digesters significantly reduces the siloxane content in the biogas. Additionally, it was demonstrated that the process of compression of the biogas, with the elimination of condensates, also produces significant reductions in the concentration of siloxanes in the biogas.

Sedimentology and age on profile Lz1023

A 270 cm long sediment sequence was recovered with a piston corer from east lobe Bonney, Taylor Valley, Antarctica, and characterized according to its sedimentological, mineralogical, and geochemical properties. It is the first record of such length recovered from east lobe Bonney. The sediment core is mainly composed of halite crystals of different sizes, water, and a relatively low and stable proportion of clastic particles. Although the sediment surface was probably disturbed by the coring process and absence or low contents of organic material or carbonates hampers the establishment of a robust chronology by radiocarbon dating, the core probably contains at least several hundred years of information about the history of the lake and the Bonney basin. Variations in halite crystal sizes and amount as well as variations in the composition of clastic material can be related to past lake level changes and evaporation cycles.

Dual process high-rate filtration of raw sanitary sewage and combined sewer overflows /

Mode of access: Internet.

Membrane filtration /

Mode of access: Internet.

Source separation collection and processing equipment : final report.

"January 1981"--Cover.

Source separation : the community awareness program in Somerville and Marblehead, Massachusetts /

Mode of access: Internet.

Magnetic separation : recovery of saleable iron and steel from municipal solid waste /

Mode of access: Internet.

Isotope separation by gaseous diffusion and centrifugation : a literature search /

"Stable Isotope Separation."

Distillation separation of zirconium and hafnium : summary report for February 14, 1949 to March 31, 1950 /

"Contract No. AT(30-1)-534."

Isotope separation and isotope exchange; a bibliography of unclassified literature.

Cover title.

Multimaterial source separation in Marblehead and Somerville, Massachusetts /

December 1979.

History of the separation of church and state in Canada.

Mode of access: Internet.

The separation of home and work in Flint, Michigan.

Bibliographical footnotes.