RFICs

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  • 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.

  • WTG - HX4920onWHT_700x458
    24GHz Frequency Divider: HX4920

    The Holzworth HX4920 Frequency Divider is a digital divide-by-4 architecture covering input signals of 4GHz to 24GHz while maintaining signal integrity. 

  • LAXAI - Synthetic Chemistry A
    Medicinal And Synthetic Chemistry

    Explore the comprehensive support and expertise available for your drug discovery process.

  • Exodus - MPA1003
    2.0 - 8.0 GHz, 33 dBm (2 W) Min Solid State High Power Amplifier: MPA1003

    The MPA1003 Solid State High Power Amplifier boasts a Class A/AB linear GaN design, offering instantaneous ultra-broad bandwidth suitable for all single-channel modulation standards.

  • 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.

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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.