RFICs

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  • The Exodus AMP20147 is a solid-state high-power amplifier designed for a wide range of applications including EMI/RFI testing, laboratory use, continuous wave (CW) and pulsed operations, and communication systems.

  • Is your data working for you? For many modern utilities, it can be difficult to get a complete understanding of their true level of operational efficiency. Not because they don’t have enough data, but because it is often split between various systems that can’t easily communicate with one another.

  • The DR3900 is a benchtop visible spectrum (320 - 1100 nm), split beam spectrophotometer with over 220 pre-programmed methods optimized for laboratory water analysis. With your daily routine of water analysis in mind, the DR3900 spectrophotometer is optimized for safe processes and accurate results.

  • Biotechnology companies consider locations in the Asia-Pacific region, such as South Korea and China to access vast treatment-naïve patient populations and accelerate their clinical trials at lower costs.

  • PHCbi brand’s 5.7 cu.ft (161 L) Cell-IQ stackable multigas CO₂/O₂ incubator is designed to support a contamination-free environment using passive controls like the inCu-saFe® copper-enriched stainless steel interior and optional SafeCell™ UV. The solid zirconia O₂ sensor and dual IR CO₂ sensors helps ensure rapid and precise gas recovery after door openings.

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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.