RFICs

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  • AMM-10220PSM
    2 - 26 GHz GaAs Surface Mount LO Driver Amplifier: AMM-10220PSM

    The AMM-10220PSM is a versatile, high-performance surface-mount amplifier designed for use as either a single-tone driver or a general-purpose gain block across wideband applications.

  • Refeyn MassFerence P2 calibrant
    Make The Most Of Your Measurements

    MassFerence P2 calibrant for the SamuxMP and SamuxMP Auto

    Ref: MP-CON-41015

  • Tulip Image 2
    Manufacture High-Quality Products With Streamlined Compliance

    Manufacture high-quality products with streamlined compliance.

  • Gallery_MPR-S500RH_front_nameplate_Large-2
    PHCbi High Performance Pharmaceutical Refrigerator: MPR-S500RH-PA

    PHCbi brand’s 19.5 cu.ft. (554 L) pharmaceutical refrigerator with adjustable shelving and forced-air circulation help helps ensures uniform temperature control from 2°C to 14°C. The sliding glass door design minimizes air loss and supports easy access in high-use environments. A microprocessor controller and OLED display feature excellent visibility and intuitive operation utilizing control buttons that provide convenient, yet secure, user commands. Refrigeration temperature can be displayed in 0.1°C increments, and the minimum and maximum temperatures within the previous 12 and 24 hours are displayed. Audible and visual alarms with adjustable setpoints warn of deviations from setpoint temperatures, and all alarm conditions are displayed and recorded. A password-protected control interface assures operational security. Natural hydrocarbon refrigerants and inverter compressor technology deliver quiet, energy-efficient performance with fast recovery. ENERGY STAR® Certified.

  • Solid State Switches
    Solid State Switches

    CPI EDB offers solid state switches designed for operation in UFH-band, L-band, S-band, C-band, X-band, Ku-band, and Ka-band applications. With peak power handling ranging from 10 to 500 W, these switches are also capable of providing low loss with isolation up to 40 dB.

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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.