Envirogen Technologies, Inc. (Envirogen) has introduced a new small-footprint fluidized bed reactor (FBR) system designed to treat low flows of selenium-laden coal mining waters economically and efficiently. Compact, Containerizable Systems Suited for Remote, Small Flows and Can Be “Networked” for Cost-Effective Treatment of Multiple Outfalls. Envirogen has recently completed several long-term operational studies with FBR [...]
Archive of posts filed under the Geochemistry category.
Black Shale Geochemistry: Why it is trouble for the Coal Industry
Black shale, or “metalliferous shale” forms under reducing conditions (anaerobic) and commonly associated closely in the roof and floor of many coal seams. Such reducing environments could present in fresh, brackish, marine or even hypersaline waters. Sulfide minerals are common in black shales. The reducing conditions form from lack of oxygen usually caused by bacteria. [...]
Chromium Eh-pH and pe-pH diagrams, solubility, remediation, speciation : Guide for Chemical Modeling
Chromium is one of the RCRA elements and considered teratogenic, mutagenic and carcinogenic. In this article, we will explore the basic geochemical properties of chromium. If you are involved in any environmental projects involving dissolved chromium, the Eh-pH diagrams may help. This is my own version of CHROMIUM 101! Article by Ankan Basu, P.G (Contact [...]
LEAD Geochemistry-Eh-pH-Solubility and remedial technologies
Lead is one of the RCRA metals. Low concentration of lead is found in sedimentary and rocks soils. This page documents the very basic geochemistry and important concepts that you should be aware of when dealing with lead contamination. I like to think about this page as LEAD 101! What is the Maximum Contaminant Limit [...]
Eutrophication of lakes due to phosphate contamination
Non-contaminated lakes are “aerobic” (oxygenated) and maintain “oligotrophic” (very low levels of nutrients) condition. Limited number algae grow in such lakes due to limited amount of nutrient available to them. Such lakes are also suitable for the fish population and support aerobic microbes. Facultative anaerobic organism cannot survive in such environment. A facultative anaerobic organism [...]
