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  • leica-microsystems-ez4-w-hero
    Educational Stereo Microscopes For College And University

    Leica EZ4 W Educational stereo microscopes for college and university

    Letting minds meet… anywhere.

    These stereo microscopes provide a wireless education solution to the science classroom. The integrated 5-megapixel cameras can live-stream HD images to students’ smartphones or tablets. Students can connect to the EZ4 W either through its own internal Wi-Fi signal or through the facilities network. The EZ4 E exclusively uses the facilities network (WLAN or LAN) to allow students to connect to the microscope. This is an ideal solution if you don`t want to add additional Wi-Fi access points to your existing wireless network concept.

  • AMP2065DD-LC
    6.0 - 18.0 GHz, 400 Watt Solid State High Power Amplifier: AMP2065DD-LC

    The AMP2065DDv-LC is purpose-built for EMI/RFI testing, laboratory applications, and HIRF (High-Intensity Radiated Fields) or pulse operations, delivering exceptional performance and reliability in critical testing and operational environments.

  • 200 Liter Precision Stainless Reactor SS
    Used 200 Liter Precision Stainless Reactor

    Used 200 liter Precision Stainless reactor, 316L stainless steel construction, dish top, dish bottom, rated 45 psi and full vacuum at 400 f internal, jacketed for 90 psi at 400 f, bottom agitator drive, on legs, serial# 4169-2, national board# 7117, built 1997.

  • MDF-DU502VXC_04_photo_ap3_920x920_v3
    PHCbi TwinGuard® -80℃ Ultra-Low Temperature Freezer: MDF-DU502VXC-PA

    PHCbi brand's 18.6 cu.ft (528L) ultra-low temperature TwinGuard freezer features a dual cooling system to offer our highest level of sample protection through the use of two independent refrigeration systems. The combination of these two circuits work together for fast temperature recovery while keeping ultra-low temperatures if one refrigeration system fails to cool. This freezer is ideal for safe, long term storage of your most high valued products, such as stem cells, embryos, cell lines, rare specimens, and other biological materials.

  • Pfeiffer Feature
    Pharmaceutical Leak Testing Services

    Pharmaceutical leak testing is a crucial process for ensuring the safety and sterility of medical and drug packaging, particularly in applications such as CCIT Test Method Validations, pilot production runs, and small-scale production runs. While pharmaceutical manufacturers may not have the resources to invest in leak testing equipment or trained personnel, inadequate testing can have serious consequences. In this article, we will discuss the leak testing services offered by Pfeiffer Vacuum and how they can help manufacturers meet regulatory requirements and ensure the safety of their products.

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About Nutrient Removal

Nutrient removal from wastewater consists of treating wastewater to remove nitrogen and phosphorus before it reenters natural waterways. High levels of nitrogen and phosphorus in wastewater cause eutrophication, a process where excess nutrients stimulate excessive plant growth such as algal blooms and cyanobacteria. The decomposition of the algae by bacteria uses up the oxygen in the water causing other organisms to die. This creates more organic matter for the bacteria to decompose. In addition, some algal blooms can produce toxins that contaminate drinking water supplies.

As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program regulates point sources, such as municipal wastewater treatment plants, that discharge pollutants as effluent into the waters of the United States. In recent years, many of the States’ environmental bodies have lowered nutrient limits to arrest eutrophication. Maryland’s effort to protect the Chesapeake Bay and its tidal tributaries is perhaps the most notable example of nutrient removal in the US. Nutrient removal continues to be a growing area of focus for wastewater treatment throughout the world.   

The removal of nitrogen and phosphorus require different nutrient removal processes. To remove nitrogen, the nitrogen is oxidized from ammonia to become nitrate through a process called nitrification. This process is then followed by denitrification where the nitrate is reduced to nitrogen gas which is released to the atmosphere and removed from the wastewater.

Nitrification is a two-step aerobic process which typically takes place in aeration tanks. Denitrification requires anoxic conditions to encourage the appropriate biological conditions to form. The activated sludge process is often used to reduce nitrate to nitrogen gas in anoxic or denitrification tanks.

Phosphorus can be removed biologically using polyphosphate accumulating organisms (PAOs) which accumulate large quantities of phosphorus within their cells and separate it from treated water. Phosphorus removal can also be achieved by chemical removal. Once removed as sludge, phosphorus may be stored in a land fill. However, many municipalities and treatment facilities are looking to resell the biosolids for use in fertilizer.