Tetracyclines (TCs) are widely used antibiotics in human and veterinary medicine and as growth promoters in the world. Sulfate radical-based advanced oxidation processes have been of great interest due to the high oxidizing potential of sulfate radical to degrade refractory organic pollutants in aqueous solution. In this study, the degradation of antibiotic TC in aqueous solution by silver-activated persulfate (Na2S2O8) in the presence of ultrasound irradiation under various conditions has been investigated. The effects of several parameters such as Ag2SO4, Na2S2O8 concentration, temperature, ultrasonic (US) power, initial TC concentration and initial pH on the degradation of TC were investigated. More than 83% of TC removal was achieved within 120 min under optimal conditions. The optimum operational conditions were found to be as follows: Ag2SO4 dosage 3.5 mmol/L, Na2S2O8 concentration 70 mmol/L, reaction temperature 25 °C, US power 120 W, initial TC concentration 50 mg/L, pH 3.0 and contact time 120 min. The degradation of TC in the persulfate/Ag+/US process followed the pseudo-first-order kinetics.
EPA Convenes Hearing On Proposed Renewables Enhancement and Growth Support Rule
On December 6, 2016, EPA held a hearing on its proposed Renewables Enhancement and Growth Support rule. The proposed rule would update the regulatory structure to allow biofuel producers to process and convert biomass at different facilities, update fuel regulations to allow for more high-ethanol fuel blends in flex fuel vehicles, and permit cellulosic biofuels to be produced from new feedstock sources. Testimony provided by Growth Energy and the Renewable Fuels Association (RFA) focused on the impact of the...
EBS upgrades its Bacterial Acceleration Chambers to further enhance bacterial growth
Continual innovation is an important component of the EBS core value called “Simple yet Profound.” This core value is rooted in the fact that meaningfully applied technology doesn’t have to be rocket science. Over the years, EBS has pursued the cutting edge of wastewater bioaugmentation.We relentlessly “peel the onion” in our pursuit for answers and the application of “applying” our newfound knowledge to assist clients in their goal to run their wastewater treatment plant...
EPA Announces Public Hearing For Proposed Renewables Enhancement and Growth Support Rule
On November 10, 2016, the U.S. Environmental Protection Agency (EPA) issued a notice in the Federal Register for a public hearing for the proposed “Renewables Enhancement and Growth Support Rule.” The proposed rule, available on EPA’s website, was signed by EPA’s Administrator on October 3, 2016, but has not yet been published in the Federal Register. This proposed rule will enhance the renewable fuel standard (RFS) program as well as other fuel regulations to support the growth of renewable...
EPA Releases Proposed Rule On Renewables Enhancement And Growth Support
On October 3, 2016, the U.S. Environmental Protection Agency (EPA) released the proposed Renewables Enhancement and Growth Support Rule. This proposed rule includes suggestions to improve the Renewable Fuel Standard (RFS) program and related pro-renewable fuel regulations. Updated regulations included in the proposed rule include allowing biofuel producers to process feedstock and then convert the material into fuels at different facilities, and an expansion to the availability of high-ethanol fuel blends. The...
Notable increases in nutrient concentrations in a shallow lake during seasonal ice growth
Nutrients may be eliminated from ice when liquid water is freezing, resulting in enhanced concentrations in the unfrozen water. The nutrients diluted from the ice may contribute to accumulated concentrations in sediment during winter and an increased risk of algae blooms during the following spring and summer. The objective of this study was to evaluate the influence of ice cover on nitrogen (N) and phosphorus (P) concentrations in the water and sediment of a shallow lake, through an examination of Ulansuhai...