Dehydration of flocs by freezing

Article Abstract:

Researchers studied water treated sludge from four U.S. locations to determine efficient means of dewatering the substance. Due to van der Walls forces, dewatering is not easily achieved. Heating is one method. However, freezing is shown in this study to be an efficient means. A conceptual model to examine the mechanisms responsible for the success of freeze/thaw conditions was developed and tested. The researchers froze the sludge with four methods, including liquid nitrogen, and then analyzed the particulate sizes of the sludge. The freezing method produced zots (granular particles) of varying sizes. Once frozen and thawed, the material was not easily rehydrated.

United States, Water pollution

---

Measurement of alkyl ethoxylate surfactants in natural waters

Article Abstract:

A new method for measuring alkyl ethoxylate alcohols (AEs) concentrations in influent, effluent and river water has been developed. The method uses hydrogen bromide derivatization combined with GC mass selective detection. Under this approach, AEs are reacted with hydrogen bromide to form corresponding alkyl bromide derivatives which are subsequently analyzed by means of capillary gas chromatography. The has already been used to remove AE surfactants during both trickling filter and activated sludge treatment with satisfactory results.

Organic water pollutants, Organic water pollution, Surface active agents

---

Photocatalytic degradation of secondary alcohol ethoxylate: spectroscopic, chromatographic, and mass spectometric studies

Article Abstract:

A titanium dioxide (TiO2) particle suspension was applied in the photocatalytic degradation of secondary alcohol ethoxylate (SAE). The particles were irradiated with ultraviolet light and combined with high starting concentrations of SAE at 2000 mg/L. The concentration levels were set to match that of industrial effluents. Particle agglomeration was generated by hydrophobic product adherence to TiO2.

Alcohol, Ethanol, Titanium dioxide

Similar abstracts:

• Abstracts: Ultrasonic evaluation of thermal fatigue composites. Cyclic deformation and fatigue of a TiNi shape-memory alloy wire subjected to rotating bending
• Abstracts: Benefiting from the unique properties of Lanthanide ions. Tandem oxidation processes using manganese dioxide: Discovery, applications, and current studies
• Abstracts: Reactions and Applications of titanium imido complexes. Chemistry of metal thio- and selenocarboxylates: Precursors for metal sulfide/selenide materials, thin films, and nanocrystals
• Abstracts: Study of the degradation of polydimethylsiloxanes on soil. On-line preconcentration and gas chromatographic determination of N-methylcarbamates and their degradation products in aqueous samples
• Abstracts: Hydrogen embrittlement characterization by disk pressure tests: test analysis and application to high chromium martensitic steels

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.