Gulf Coast Environmental Systems

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Dimethyl Sulfide

What is Dimethyl Sulfide?Dimethyl sulfide

Dimethyl sulfide (DMS), also known as methylthiomethane, is an organosulfur compound. It is a methyl sulfide, in which the sulfur atom is substituted by two methyl groups, with the chemical formula of (CH3)2S. It is a highly flammable straw-colored liquid, with a boiling point of 37 degrees Celsius, or 99 degrees Fahrenheit. This is a compound that is easily recognized by its foul odor, that is often described as “cabbage like”. Unlike many other organosulfur compounds, this disagreeable odor is present in even low concentrations of DMS. Dimethyl sulfide is the product of dimethylsulfoniopropionate (DMSP) breakdown, and is also the result of bacterial metabolism of methanethiol.

Dimethyl Sulfide

Where is Dimethyl Sulfide Found? [Read more…]

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Methyl Mercaptan

What is Methyl Mercaptan?

methyl mercaptan

Methyl Mercaptan, also known as Methanethiol, is a volatile organic compound known as an organosulfur, because it contains sulfur. Methyl mercaptan is a member of a series of compounds, in which there can be chains of up to 20 carbon-atoms attached to sulfur. The chemical formula for methanethiol is CH3SH; it is classified as a thiol.  It is colorless, highly flammable, and has a strong rotten-cabbage-like odor. It is a colorless, low-boiling liquid, that is denser than water. When inhaled, Methyl Mercaptan is very toxic, and the dangerous gas is often overlooked when in low concentrations. It can undergo steam reforming to hydrogen-rich gas over cerium oxide-coated rhodium or aluminum oxide catalyst via the solid-gas reaction, under certain operating conditions. This process has potential use in toxic-waste treatment, such as removal of methanethiol present in industrial-waste off-gas. Because it is derived from decaying organic matter, Methyl Mercaptan is a weak acid, and is reactive with dissolved metals, in aqueous solutions. [Read more…]

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Is There Money Hiding in Your Landfill?

What gases are released by landfills?

Landfills consist of a complex mix of gases and VOCs, and are a source of major pollution, and potential revenue… which we will address later in this article. Dangerous gases like methane(CH4), carbon dioxide(CO2), sulfides (SOx), and ammonia, are created by the decomposition and evaporation of organic compounds, as well as chemical reactions between waste components. Methane and carbon dioxide are the most prevalent, making up between 90 and 98% of all gases and VOCs released. Methane from Landfills

Why are these chemicals a concern?

These gases and VOCs are considered greenhouse gases, and play a huge role in global warming. According to the EPA, in the United States, landfills are the third most prevalent source of methane, and other greenhouse gases. Another risk when dealing with methane is the flammability of the gas, which is incredibly high. When condensed into a small space, methane is considered an explosive, and should be handled with extreme caution. Landfill gas explosions are not uncommon.

In addition to pollution and the risk of exploding, these VOCs pose a serious risk to human health. They have been linked to eye, throat and lung irritation, nausea, headache, nasal blockage, sleeping difficulties, weight loss, chest pain, and even asthma. Some recent studies indicate a connection between air pollution, and Alzheimer’s, diabetes, and slow fetal development. [Read more…]

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Sulfur Oxides

What are sulfur oxides?

Sulfur oxides (SOx) are compounds of sulfur and oxygen molecules. Sulfur dioxide (SO2) is the predominant form found in the lower atmosphere. Sulfur oxide is the common term for many types of sulfur and oxygen containing compounds such as:

  • Lower sulfur oxides(SnO, S7O2 and S6O2)SOx, Sulfur Oxides
  • Sulfur monoxide(SO)
  • Sulfur dioxide(SO2)
  • Sulfur trioxide(SO3)
  • Higher sulfur oxides(SO3 and SO4 and polymeric condensates of them)
  • Disulfur monoxide(S2O)
  • Disulfur dioxide(S2O2)

These molecules are colorless, but have a very distinct and strong scent and taste that can be detected when the gas is of high concentration.

Sulfur monoxide, SO, is a common sulfur oxide compound that is rarely found outside of space. When concentrated or condensed it becomes S2O2, or disulfur dioxide (see below). Under extreme laboratory conditions sulfur monoxide can be produced by treating sulfur dioxide with sulfur vapors in a glow discharge. In spaced sulfur monoxide is detected around one of Jupiter’s moons, Lo, in the atmosphere and in the plasma torus. It has also been found in the atmospheres of Venus and the Hale-Bopp comet as well as the interstellar medium. In biological chemistry, sulfur monoxide may have some biological activity, the formation of transient SO in porcine coronary artery has been inferred from the reaction products. Because it is rare in occurrence it is difficult to fully understand the hazardous of sulfur monoxide but as sulfur dioxide it is both toxic and corrosive.

Sulfur dioxide, one of the more popular sulfur oxides, is a poisonous gas with a smell that is often described as a just struck match. Sulfur dioxide can be can be liquefied at room temperatures under moderate pressures. As a liquid it freezes at -37° C (-99.4° F) and boils at -10° C (+14° F) under atmospheric pressure. Sulfur dioxide, like sulfur monoxide is often found in space. In the atmosphere of Venus it is the third-most significant gas at 140 ppm. Interestingly, on Venus it is a contributor to global warming and is a key component of the chemical reactions in the planets atmosphere. [Read more…]

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Dry Scrubber Media Disposal

Revenue Development in Dry Scrubber Media Replacement

When a client came to GCES with a zero waste initiative we had to find a solution for their spent dry scrubber media. We provided them a solution that not only met their zero waste initiative but also allowed opportunity for financial recovery of media replacement costs.

Dry scrubber media, also known as iron sponge sulfide, is composed of iron oxide, elemental sulfur, wood fiber, water, soda ash and limestone.

There are many options for the disposal of spent iron sponge with the most common being simply by spreading the spent media onto an area of land and burying it with a light earth cover. In urban areas the material is generally accepted with EPA approval at a sanitary landfill. In recent years revenue streams and partnerships have been developed between the disposers of the spent media and the agricultural community. In these scenarios agricultural uses for iron sponge include in the farming of tomatoes and coniferous trees such as Christmas trees. [Read more…]

Company Profile

Gulf Coast Environmental Systems (GCES) is your custom solutions provider for pollution control systems, industrial ovens, systems engineering and field support worldwide. Our unique approach is to analyze your process stream and business objectives and propose an ideal solution or range of options to help you optimize these objectives. GCES is a one-stop shop: we provide engineering services, manufacturing, installation, commissioning and ongoing support. With our broad base of expertise and large installed global base, we are well-positioned to solve your pollution control issues.

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