Passivating Effect of Elemental Sulfur On Steel in Alkaline Pulping Liquors

Numerous types of organic environmental pollutants are encountered in forest industry effluents which potentially could inhibit consortia of anaerobic bacteria. The purpose of this study was to collect anaerobic bioassay data from the literature to better estimate the impact of these pollutants on anaerobic wastewater treatment systems. The most important methanogenic inhibitors in forest industry wastewaters are wood resin, chlorophenols and tannins. These compounds account for toxicity in alkaline pulping liquors, bleaching effluents and debarking wastewaters, respectively. Adaptation to chlorophenol toxicity can be expected since they are eventually degraded in anaerobic systems. Wood resin compounds, on the other hand, are not biodegraded anaerobically and therefore their toxicity is persistent. Toxicity in forest industry wastewaters does not necessarily preclude anaerobic treatment. A variety of techniques can be employed to diminish inhibition, such as dilution and detoxification treatments.

Download Full-text

Scanning Electron Microscope Study of Bacteria on Mineral Surfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100090634 ◽

1976 ◽

Vol 34 ◽

pp. 130-131

Author(s):

V.K. Berry

Keyword(s):

Oxidation Reaction ◽

Electron Microscope Study ◽

Elemental Sulfur ◽

Thiobacillus Ferrooxidans ◽

Physical Contact ◽

Metal Sulfides ◽

Low Grade ◽

Mineral Surfaces ◽

Mineral Surface ◽

Scanning Electron Microscope Study

There are two strains of bacteria viz. Thiobacillus thiooxidansand Thiobacillus ferrooxidanswidely mentioned to play an important role in the leaching process of low-grade ores. Another strain used in this study is a thermophile and is designated Caldariella .These microorganisms are acidophilic chemosynthetic aerobic autotrophs and are capable of oxidizing many metal sulfides and elemental sulfur to sulfates and Fe2+ to Fe3+. The necessity of physical contact or attachment by bacteria to mineral surfaces during oxidation reaction has not been fairly established so far. Temple and Koehler reported that during oxidation of marcasite T. thiooxidanswere found concentrated on mineral surface. Schaeffer, et al. demonstrated that physical contact or attachment is essential for oxidation of sulfur.

Download Full-text

Chemical Conversion of SO2 in Low-Temperature Low-Pressure Oxyhydrogen Flames. 2. Mechanism of Formation of Elemental Sulfur

Физика горения и взрыва ◽

10.15372/fgv20160604 ◽

2016 ◽

Keyword(s):

Low Temperature ◽

Elemental Sulfur ◽

Chemical Conversion ◽

Low Pressure ◽

Mechanism Of Formation

Download Full-text

Elemental sulfur in Eddy County, New Mexico

Circular ◽

10.3133/cir628 ◽

1970 ◽

Author(s):

Jim S. Hinds ◽

Richard R. Cunningham

Keyword(s):

New Mexico ◽

Elemental Sulfur

Download Full-text

UNILOY 50Cr/50Ni

Alloy Digest ◽

10.31399/asm.ad.cr0002 ◽

1969 ◽

Vol 18 (2) ◽

Keyword(s):

Corrosion Resistance ◽

High Temperature ◽

Physical Properties ◽

Surface Treatment ◽

Heat Treating ◽

Oil Refinery ◽

Corrosive Media ◽

Corrosion Resistant ◽

Temperature Performance ◽

Pulping Liquors

Abstract UNILOY 50Cr/50Nj is an improved corrosion-resistant, wrought alloy with outstanding resistance to a wide variety of corrosive media. It is recommended for oil refinery heaters, incinerator components, metallurgical heat treating furnace components and reactor vessels for treating pulping liquors. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cr-2. Producer or source: Universal Cyclops Steel Corporation.

Download Full-text