On November 7, 2013, the U.S. Court of Appeals for the Ninth Circuit granted in part and denied in part the Natural Resources Defense Council’s (NRDC) petition for review of the U.S. Environmental Protection Agency’s (EPA) conditional registration of HeiQ AGS-20 and AGS-20 U (collectively, AGS-20) nanosilver products. The court held that “substantial evidence” supported EPA’s decision to use the characteristics of toddlers rather than infants in determining whether AGS-20 placed consumers at risk. The court vacated EPA’s decision “insofar as it concluded that there was no risk concern requiring mitigation for short- and intermediate-term aggregate oral and dermal exposure to textiles that are surface-coated with AGS-20.” The court stated: “Our decision to grant the petition and vacate the decision in part is based solely on the fact that EPA’s own rule states that there is a risk concern requiring mitigation when the calculated MOE is less than or equal to 1,000 and, under these circumstances, the actual MOE equals 1,000. This holding does not affect any portion of EPA’s decision where the calculated MOE is greater than 1,000.” Finally, the court held that “substantial evidence supported the EPA’s decision not to consider additional sources of exposure to nanosilver other than AGS-20 in concluding that the product would not have adverse effects on consumers.”
- Bergeson & Campbell, P.C.
- Court Vacates and Remands EPA's Conditional Registration of ...
Water Use in Concrete Production Higher Than Expected - Case Study
Researchers uncover areas where better management may mitigate high water useAlthough many environmental impacts of concrete production have been well studied, little research has been dedicated to just how much water it uses. But, a study published in the journal Nature seeks to quantify the impact of concrete production on global water withdrawals, and it makes some dramatic conclusions and predictions.The authors, Sabbie A. Miller, Arpad Horvath, and Paulo J.M. Monteiro, established a 50-year historical trend...
Extracellular polymeric substance production in high rate algal oxidation ponds
Integrated algal pond systems (IAPSs) combine anaerobic and aerobic bioprocesses to affect sewage treatment. The present work describes the isolation and partial characterisation of soluble extracellular polymeric substances (EPSs) associated with microalgal bacterial flocs (MaB-flocs) generated in high rate algal oxidation ponds (HRAOPs) of an IAPS treating domestic sewage. Productivity and change in MaB-flocs concentration, measured as mixed liquor suspended solids (MLSS) between morning (MLSSAM) and evening...
Fly Ash & the Lightweight Aggregate Market
In 2015, the global fly ash market was estimated to be valued at 40 billion USD. A recent industry analysis by Research Nester anticipates the market will reach an estimated 70 billion USD by the end of 2023 – a 7.1% CAGR owing to increasing urbanization and a boost in construction projects. Along with bottom ash (BA) and flue gas desulfurization gypsum (FGD gypsum, or synthetic gypsum), fly ash is a coal combustion residual (CCRs) – a byproduct of coal-generated power and one of the largest...
Basic Information of Rice Production Line
The objective of a rice milling system is to remove the husk and the bran layers from paddy rice to produce whole white rice kernels that are sufficiently milled, free of impurities and contain a minimum number of broken kernels. The milling yield and quality of rice is dependent on the quality of the paddy, the milling equipment used and the skill of the mill operator. With the rapid upgrading of agricultural machinery, machines concerned with rice is becoming more and more advanced. At the same time, many new...
Construction Aggregate Mining: Sand and Gravel - Case Study
In 1995, we helped a company locate sand and gravel volumes in San Marcos, Texas. This material can be mined and sold for construction purposes. Process The Sting R1 with 47 Dual-Mode Swift electrodes was spaced three meters apart. Two parallel lines were collected eight meters apart to identify conductive silt/clay/shale and resistive sand/gravel areas. Results Sand and gravel zones and the shale bedrock surface were located to help estimate sand and gravel volumes. Additionally, the imaging identified the...