The secondary treated effluents of pulp and paper mills contain high chemical oxygen demand (COD) that is associated with organic matter. Therefore, this study explores the adsorption substances contributing to COD using CoFe2O4 quartz sand-coated in batch fixed-bed column experiments. X-ray diffraction, scanning electron microscopy, Brunauer–Emmett–Teller analysis, photoelectron spectroscopy w...

Experiments were conducted using enterohemorrhagic Escherichia coli O157:H7 cells to investigate the influence of extracellular macromolecules on cell surface properties and adhesion behavior to quartz sand. Partial removal of the extracellular macromolecules on cells by a proteolytic enzyme (proteinase K) was confirmed using Fourier transform infrared spectroscopy analyses. The proteinase K tr...

Ultra-High Performance Concrete (UHPC) improves the bearing capacity as well durability of structural concrete. This study aims to investigate constituents UHPC in both phases: aggregate and cementitious materials. The proper ratio mixture was chosen based on combining an gradation quartz sand crushed stone. In addition, compressive strength hardened cement paste investigated achieve optimal si...

We examined the chemical reactions influencing dissolved concentrations, speciation, and transport of naturally occurring arsenic ~As! in a shallow, sand and gravel aquifer with distinct geochemical zones resulting from land disposal of dilute sewage effluent. The principal geochemical zones were: ~1! the uncontaminated zone above the sewage plume @350 mM dissolved oxygen ~DO!, pH 5.9#; ~2! the...

The filamentous growth form is an important strategy for soil microbes to bridge air-filled pores in unsaturated soils. In particular, fungi perform better than bacteria in soils during drought, a property that has been ascribed to the hyphal growth form of fungi. However, it is unknown if, and to what extent, filamentous bacteria may also display similar advantages over non-filamentous bacteri...

To study the influence of fractal distribution particle size on critical state characteristics calcareous sand, a type sand from certain reef South China Sea was used in this study. For comparison, standard quartz also used. A series drained shear tests two sands were then conducted to investigate their characteristics. It demonstrated that dimension is suitable for characterizing (PSD) with di...