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Article 2: Changes in Iron and Manganese Concentrations in C&DD Leachate with Recirculation

As stated in the previous article in this series, the “Introduction to the Effects of Leachate Recirculation Series”, leachate data was compiled and analyzed using time series graphs and statistical trend testing. The time series graphs allow for a visual determination of trends. However, because there is significant variation in the data due to both natural variation and anomalous data points, visually assessing the trends can sometimes be difficult and subjective. The statistical trend testing using two methods, Sen’s Slope/Mann-Kendall slope estimator and Linear Regression, allowed for a more objective approach to determining trends. Read More

Introduction to the Effects of Leachate Recirculation

The purpose of this article series is to explore the changes in leachate quality observed in three C&DD landfills recirculating leachate in Ohio and answer the question: Does leachate recirculation increase constituent concentrations? Read More

03.03.16 | Thomas M. Ryan

Chemical Analysis of Limestone Calcium Oxide Materials

As calcium-bearing minerals have become more widely used in agriculture, energy, and road-building and more important in the marketplace as a result, their analysis has been subject to a great deal of debate and controversy. Read More

10.01.15 |

Consumer Product Safety Testing: Will Your Product be Labeled as "Hazardous"?

Product safety issues have been the topic of much debate in the United States formore than 50 years. Most of these issues deal with the presence of lead or another toxic compound and the resultant toxicity in common consumer goods. Read More