An understanding of sludge rheology during anaerobic digestion can improve digester performance, particularly with regards to mixing. However, the “black box” nature of digesters limits the knowledge on sludge flow behaviour, once it enters the digester. A study on the flow properties (i.e. apparent viscosity and yield stress) as well as the yielding and restructuring behaviour of primary, seco...

A laboratory study was conducted with the aim of evaluating and optimizing the environmental parameters of "landfarming", i.e., the disposal by biodegradation in soil of oily sludges generated in the refining of crude oil and related operations. Oil sludge biodegradation was monitored by CO2 evolution and by periodic analysis of residual hydrocarbons. The parameters studied were soil moisture, ...

For the several decade years, organic light-emitting diodes (OLEDs) have been intensively studied because of their potential applicability to large-size flat panel displays, and more recently also solid-state lighting [1-4]. However, the lifetimes of the organic electronic devices are one of the most matters for the practical use of such devices, because of the ambient moisture and oxygen immed...

Quorum sensing is a concentration-sensing mechanism that plays a vital role in sludge granulation. In this study, the regularities of distribution of different signal molecules, including intra- and interspecific signal molecules (diffusible signal factor, DSF), interspecific signal molecules (autoinducter-2, AI-2) and intraspecific signal molecules (acyl-homoserine lactones, AHLs), from three ...

introduction population growth, increasing consumption of natural energy sources, the increasing use of fossil fuels, especially the oil and gas industry in recent years with the energy imbalance management has led to emergence of global energy crisis. moreover, rapid urbanization and industrialization have substantially increased the amount of high-strength wastewater being produced, which in ...

This paper describes the adsorption of two organic (acetic and citric) acids on the blast furnace sludge, a representative by-product of the steelmaking industry. By PIXE, XRD, BET and SEM methods, it was shown that blast furnace sludge is a complex heterogeneous material with a specific surface area of s = 31.46 m g, composed mainly of amorphous phase (w = 76.2 %), calcite (w = 9.9 %), magneti...

Henry’s law constant is an important equilibrium factor in volatile organic compounds (VOCs) mass transfer process. The air-water dimensionless Henry’s law constants (KH) and the dimensionless apparent Henry’s law constants (K’H) in air-activated sludge mixed liquor and air-wastewater system for volatile organic compounds (VOCs) were measured at 298K. Hydrophilic VOCs (isopropanol and acetone) ...