Изучение сорбционных свойств активированного угля и оксигидрооксида алюминия для удаления гуминовых веществ из природных вод

It is found that the time of adsorption process of organic substances on activated carbon (PAC) Norit SA UF is about 3 hours. The maximum adsorption capacity of activated carbon to organic substances equals to 0.25 mg/mg. The maximum adsorption capacity of aluminum oxyhydroxide to organic substances equals to 2.3 mg/mg. Consequently, the aluminum oxyhydroxide has better adsorption characteristics in comparison with the activated carbon for removal of humic substances. It is shown that the destruction of the iron colloid substances occurs as a result of the removal of humic organic substances from the solution

Изучение сорбционных свойств активированного угля и оксигидрооксида алюминия для удаления гуминовых веществ из природных вод

It is found that the time of adsorption process of organic substances on activated carbon (PAC) Norit SA UF is about 3 hours. The maximum adsorption capacity of activated carbon to organic substances equals to 0.25 mg/mg. The maximum adsorption capacity of aluminum oxyhydroxide to organic substances equals to 2.3 mg/mg. Consequently, the aluminum oxyhydroxide has better adsorption characteristics in comparison with the activated carbon for removal of humic substances. It is shown that the destruction of the iron colloid substances occurs as a result of the removal of humic organic substances from the solution

Bases of inorganic and organic chemistry

Stated fundamental theoretical principles of general, inorganic and organic chemistry and analyzed the reactivity of the most important classes of inorganic and organic substances. A multivariate tasks and exercises for classroom and independent work are proposed. For university students full-time and distance learning areas "Chemical Technology and Engineering" "Oil and gas engineering and technology" and others

Multi-energy techniques for radiographic monitoring of chemical composition

A theoretical model of multi-energy radiography (MER) are proposed. It is shown that, as distinct from the conventional radiography, MER allows identification of organic substances and control of their chemical composition. Broad prospects are noted for MER application, specifically, for detection of prohibited substances (explosives, drugs, etc.) during customs and anti-terrorist safety inspection.Comment: 4 pages, 1 figure, RMA-2002 Conference, Ann Arbor, Michigan, US

Use of copper phtalocyanine adsorption layer for substraction of spirits in gasochromatographic analysis

The chromatographic properties of silica gel with copper phtalocyanine surface layer are investigated. Parameters of hydrocarbons and oxygen-containing organic substances retention are different for the layers obtained by sorption method and chemical synthesis that is connected with structure of complex on the carrier surface. Sorbents are used to analyse mixtures of oxygen-containing compounds and to subtract spirits at group analysis of oxygen-containing organic substances

Organic substances against Monilia laxa on apricot – in-vitro and on-farm experiments

Natural substances against Monilia laxa were onfarm and in-vitro tested. According to on-farm tests, some products reached interesting efficacies. The fluctuation of the year and parcel pressures, makes it difficult to perform the results

The N[Single Bond]H Harmonic Bands of Pyrrole at lambda9900, and the Structure of the Pyrrole Molecule

In their study of the infra-red absorption of organic substances in carbon tetrachloride solution Wulf and Liddell (1) found that the strong second harmonic N-H band of pyrrole is accompanied by a weak satellite which lies approximately 50 cm^-1 to the long wave side and has roughly one-twentieth the intensity of the main band. The main band has been attributed by Pauling (2) to a planar pyrrole molecule and the weak satellite to a second molecular species in which the imino hydrogen lies out of the plane of the other atoms

Investigations into the burning-out of organic substances in the ceramic body

Pressed compacts were made of spray dried alumina containing water soluble polyvinyl alcohol or cellulose derivative binder. The burning out of organic binder on gradual heating was investigated by visual and microscopic observations of the cross section and by thermogravimetry. Burning out proceeds inward from the peripheries, gradually reducing the size of the black core, which first consists of a dark boundary layer and later turns uniformly black with a sharp boundary. A detailed mechanism of the burning out process between and within the spray dried granules is observed under the microscope. Oxygen atmosphere accelerates the burning out process

Performance Evaluation of a Full-Scale Deep U-Tube Utilizing Ozonated Oxygen as the Process Gas for Treating Drinking Water

A deep U-tube for treating drinking water is composed of a coaxial inner tube serving as an efficient concurrent down-flow ozone dissolver and an outer column carrying out reactions between ozone and organic substances dissolved in the water after sedimentation treatment. In the present study, we developed a novel simulation model of the U-tube reactor, assuming that the U-tube is composed of a plug flow section (inner tube) followed by a tanks-in-series section (outer bubble column) and taking into account the reactions involved, and the effects of the hydrostatic pressurization on the flow and absorption equilibrium for the ozone and inactive gases in developing the mass balance models. We constructed an algorithm to evaluate the U-tube reactor performance based on the mass balance models. The hydrodynamics and mass transfer characteristics in the inner tube were measured and their correlations were incorporated in the simulation model. Available literature data and correlations on the rates of reactions between ozone and organic substances, the gas-liquid equilibrium for the active and inactive gases and the fluid mixing properties are also incorporated in the simulation model. The simulation results well explained the available data on the ozone absorption efficiency and the removal efficiency of odorous material (2-MIB) in a pilot plant and a real U-tube reactor. It is found that the ozone absorption is practically a single function of the gas/liquid ratio, while the decomposition efficiency of 2-MIB is a single function of the ozone dose for the water quantity to be treated

Dissolved carbon and CDOM in lake ice and underlying waters along a salinity gradient in shallow lakes of Northeast China

The variations of DOC and DIC concentrations in lake ice and underlying waters were examined in 40 shallow lakes across the Songnen Plain, Northeast China. The lakes, frozen annually during winter, included freshwater and brackish systems (EC > 1000 μS cm−1; range: 171–12607 μS cm−1 in underlying water). Results showed that lake ice contained lower DOC (7.2 mg L−1) and DIC (6.7 mg L−1) concentration compared to the underlying waters (58.2 and 142.4 mg L−1, respectively). Large differences in DOC and DIC concentrations of underlying waters were also observed between freshwater (mean ± SD: 22.3 ± 11.5 mg L−1, 50.7 ± 20.6 mg L−1) and brackish lakes (83.3 ± 138.0 mg L−1, 247.0 ± 410.5 mg L−1). A mass balance model was developed to describe the relative distribution of solutes and chemical attributes between ice and the underlying waters. Results showed that water depth and ice thickness were the key factors regulating the spatial distribution of solutes in the frozen lakes. Chromophoric dissolved organic matter (CDOM) absorption coefficient at 320 nm, aCDOM(320) and specific UV absorbance (SUVA254) were used to characterize CDOM composition and quality. Compared to the underlying waters, CDOM present in ice largely included low aromaticity organic substances, an outcome perhaps facilitated by ice formation and photo-degradation. In ice and underlying freshwaters, CDOM predominantly included organic C fractions of high aromaticity, while low aromaticity organic substances were observed for brackish lakes. Results of this study suggest that, if water salinity increases due to climate change and anthropogenic activities, significant changes can occur in the dissolved carbon and fate of CDOM in these shallow lakes