>>Federal regulators have laid out a series of steps to be taken in coming weeks and months to finish putting the Chesapeake on a "pollution diet," known bureaucratically as a "total maximum daily load." Today is for the distribution of limits for nitrogen and phosphorus pollution - from sewage, air pollution and runoff from farms and urban and suburban lands - that stimulate algae blooms and trigger the bay's summer "dead zone."On Aug. 15, the states will get similar limits to achieve on sediment, the silt that clouds the water and prevents fish-harboring underwater grasses from growing.<<
DEP's wastewater treatment plants were not originally designed to remove nitrogen, a naturally-occurring component of all wastewater.
****Thermoenergy looks forward to working with DEP to pioneer this advanced ammonia treatment technology not just for use by New York City but other municipalities within the U.S. and abroad who are seeking cost-effective and environmentally responsible ways of dealing with nitrogen/ammonia regulations.
MORE ABOUT TMEN's ARP AMMONIA REMOVAL PROCESS
* REMOVE AMMONIA AT A FRACTION OF THE COST OF BIOLOGICAL TREATMENT * HOW CASTION HELPS REMOVE AMMONIA * AMMONIA REMOVAL PROCESS
Remove Ammonia at a Fraction of the Cost of Biological Treatment
Remove the ammonia in industrial wastewater and from municipal wastewater at a fraction of the cost of biological treatment with CASTion's Ammonia Recovery Process (ARP). There is ammonia in industrial wastewater systems as it enters the plant. Additional ammonia is released in the aerobic or anaerobic digester as it reduces sludge volumes. This ammonia is concentrated in the centrate or filtrate streams as the sludge is separated and consolidated in the filter press or centrifuge. Many industrial applications use ammonia as a part of their process chemistry and it finds its way into the industrial wastewater as a contaminate.
How CASTion Helps Remove Ammonia
Typically, 40-50% of the total nitrogen in a municipal wastewater treatment plant is found as ammonia in the centrate or filtrate streams. During ammonia removal, wastewater progresses through the RCAST Ammonia Removal and Recovery Process. This is a compact, high efficiency system, that combines flash vacuum distillation with ion exchange to remove 90% of the ammonia in these streams at a much lower cost than traditional biological removal systems. This results in the recovery of ammonia for reuse as ammonium sulfate, a common fertilizer. After undergoing successful ammonia removal, wastewater is then recycled back to the main municipal plant or used as process water in an industrial process.
Ammonia Removal Process
To begin the Ammonia Removal Process, the ammonia in industrial wastewater is conditioned so that neither suspended solids nor precipitates can reach the ammonia removal systems. If the ammonia concentration is high, vacuum stripping using our patented RCAST ammonia removal systems is used to capture the ammonia that would readily volatilize (about 80%). Influent (with 300 ppm ammonia-nitrogen or less) is then input to an industrial grade ion exchange resin which selectively adsorbs the ammonia. The adsorption columns are regenerated using either a brine or sulfuric acid. The regeneration solution is used repeatedly, where the ammonia concentration builds up to several thousand ppm. The spent ammonia-laden regeneration solution is stripped of ammonia to produce a commercial-grade (about 40%) solution of ammonium sulfate. The figure below illustrates the process:
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