Maximizing energy recovery from wastewater via bioflocculation-enhanced primary treatment: a pilot scale study.

Anaerobic digestion of municipal sewage sludge is widely used for harvesting energy from wastewater organic content. The more organic carbon we can redirect into the primary sludge, the less energy is needed for aeration in secondary treatment and the more methane is produced in anaerobic digesters. Bioflocculation has been proposed as a promising separation technology to maximize carbon capture in primary sludge.

High-Rate Partial Nitritation of Municipal Wastewater after Psychrophilic Anaerobic Pretreatment.

Partial nitritation/anammox can provide energy-efficient nitrogen removal from the main stream of municipal wastewater. The main bottleneck is the growth of nitrite oxidizing bacteria (NOB) at low temperatures (<15 °C). To produce effluent suitable for anammox, real municipal wastewater after anaerobic pretreatment was treated by enriched ammonium oxidizing bacteria (AOB) in suspended sludge SBR at 12 °C.

Type specimens of centipedes (Myriapoda, Chilopoda) in the National Museum, Prague (Czech Republic).

The centipede collection in the National Museum in Prague contains type material of 16 taxa (14 species and two subspecies), of which 15 were described by Luděk J. Dobroruka and one by Karl W. Verhoeff: Allothereuawilsonae Dobroruka, 1979; Chinobiusalenae Dobroruka, 1980; Lithobiuscorrigendus Dobroruka, 1988; Lithobiuscreticus Dobroruka, 1977; Lithobiuserythrocephalusmohelensis Dobroruka, 1959; Lithobiusevae Dobroruka, 1958; Lithobiusmagurensis Dobroruka, 1971; Lithobiuspurkynei Dobroruka, 1957; Lithobiustatricus Dobroruka, 1958; Lithobiustatricusmonounguis Dobroruka, 1958; Monotarsobiushomolaci Dobroruka, 1971; Monotarsobiuskrali Dobroruka, 1979; Pachymeriumdilottiae Dobroruka, 1976; Pachymeriumhanzaki Dobroruka, 1976; Scolopendraaztecorum Verhoeff, 1934 and Strigamiaolympica Dobroruka, 1977.

Effect of S/N ratio on sulfide removal by autotrophic denitrification.

In this study a completely stirred tank reactor was used to study the effect of sulfide to nitrate (S/N) ratio on sulfide removal while nitrate was used as electron acceptor. Several S/N ratios were studied for this purpose ranging from 0.3 to 2.

Stability and inhibition of anaerobic processes caused by insufficiency or excess of ammonia nitrogen.

Ammonia increases buffer capacity of methanogenic medium in mesophilic anaerobic reactor thus increasing the stability of anaerobic digestion process. Optimal ammonia concentration ensures sufficient buffer capacity while not inhibiting the process. It was found out in this paper that this optimum depends on the quality of anaerobic sludge under investigation.