Hydrogen sulfide

The anaerobic digestion process can be split up into the following four phases, each requiring its own characteristic group of micro-organisms: 1) Hydrolysis: the conversion of non-soluble biopolymers to soluble organic compounds. 2) Acidogenesis: conversion of soluble organic compounds of volatile fatty acids. 3) Acetogensis: conversion of volatile fatty acids to acetate and hydrogen. 4) Methaneogenesis: conversion of acetate and carbon dioxide plus hydrogen to methane…

reagent A and B there was no color change, thus the microbes do not reduce nitrate. For the hydrolytic test, the starch plate had highlights around the bacterial growth indicating starch hydrolysis. In the fat containing plate there was no dark pigment, meaning enzyme wasn’t made. The casein test had no clear zones, meaning casein wasn’t degrade. For the Tryptophan degradation, no red was detected on top of the medium, which indicated that it was negative. Urea hydrolysis test was also negative…

about acid mine drainage, and what can be done to reduce this pollutant. INTRODUCTION/BACKGROUND: Acid mine drainage (AMD) often occurs at abandoned mining sites. Acid generation is the result of combining certain minerals, water, and an oxidant. Sulfide minerals are the most common producers of AMD, but mining waste rock, tailings, and other mining structures also generate AMD. AMD has a low pH and consists of large concentrations of heavy metal and other toxic elements. This pollutant affects…

The tarnishing of silver is due to a chemical reaction between silver and hydrogen sulfide, producing silver sulfide and hydrogen gas. The balanced chemical equation is 2Ag (s) + H2S (g) → Ag2S (s) + H2. This is a single replacement reaction. This reaction most commonly occurs through contact with hydrogen sulfide in the air - although direct contact with substances that contain sulfur can cause tarnishing. Silver tarnishes very quickly when it is exposed to air that contains high levels of…

the mixture is then heated to a temperature of about fifty degrees Celsius, and 100g of fine powders of antimony sulfide are added in small amounts periodically to the heated mixture. After all of the crystals of antimony sulfide have been added to the mixture and evolution of hydrogen sulfide has subsided, the temperatures are adjusted to higher levels gradually until the resultant solution starts to boil (Karl‐Heinz and Magnus 20). It is left to boil for an hour, adding boiling water…

using a G2 FE-TEM Tecnai microscope at an accelerating voltage of 200 kV. The content of Pt alloy catalyst in the supported catalysts was obtained by ICP-AES (RF source: Jobin Yvon 2301, 40.68 MHz). X-ray photoelectron spectroscopy (XPS) was performed using an AXIS (Q2000) photoelectron spectrometer equipped with mono-Al-Ka X-ray source operating at 1486.6 eV. Electrochemical performances were obtained by the thin active layer rotating disk electrode method using Nafion® as a binder using a…

Chlorinating drinking water has its benefits by its shortcomings and it explains why the U.S. has continued to use this method while maintaining one of the best public water systems in the world. Chlorination is chosen not only because it kills disease causing microorganisms, but because of the other benefits it holds. Chlorination removes substances that can taint water taste like manganese, hydrogen sulfide, and iron. Chlorination can also be made to fit any system size and does not require…

Introduction: Corrosion, otherwise called rusting is defined as a natural process that changes over a refined metal to a more chemically stable shape, for example, its oxide, hydroxide, or sulfide. It is the slow destruction of materials (generally metals) by a chemical reaction caused by the environment. Corrosion is basic to ponder in two perspectives. Right off the bat, financial, which including the lessening of material misfortunes coming about because of the squandering ceaselessly or…

both, Proust discovered glucose. In 1784, Proust aided in the discovery of the first hot air balloon (Wisniak, 2012). According to Wisniak (2012), Proust and a fellow colleague Jean-Francois Pilatre de Rozier, travel by hot air balloon to the royal court all while making note of its speed, its altitude and how far the balloon could travel. This was a new beginning of the study of aeronautics. According to the Scientific Dictionary (2008), Proust published papers throughout his journey as a…

The two types of electrical bonding with the oxygen and hydrogen molecules are covalent and ionic. Ionic is weaker than covalent, and involves two opposite charges being attractive one another. Covalent bonding is slightly stronger, which shares the outermost valence electrons with other atoms. Covalent bonding is the attraction which keeps the hydrogen and oxygen atoms together. The key importance for water to have the variety of properties is due to the structure of having hydrogen and oxygen…