Use of Ammonia and Nitrate Use of Ammonia and Nitrate Sensors for Activated Sludge Aeration ... PDF
Preview Use of Ammonia and Nitrate Use of Ammonia and Nitrate Sensors for Activated Sludge Aeration ...
October 23, 2012 UUssee ooff AAmmmmoonniiaa aanndd NNiittrraattee Sensors for Activated Sludge Aeration Control Troyy Morggan;; Western Reggional Process Analyytical Managger Overview Sensors Available • Optical - Nitrate / Nitrite •• IIoonn SSeelleeccttiivvee EElleeccttrrooddeess ((IISSEE)) - Ammonium / Nitrate ISE Theoryy of Opperation • Relationship of Ammonia & Ammonium • Potassium & Chloride Compensation electrodes BBiioollooggiiccaall NNiittrrooggeenn RReemmoovvaall bbaassiiccss Control Strategy • AAmmmmoonniiuumm ttoo ccoonnttrrooll aaeerraattiioonn rraatteess • Nitrate to control recycle rates CCaassee SSttuuddiieess uussiinngg AAmmmmoonniiaa ttoo ccoonnttrrooll aaeerraattiioonn rraatteess 2 SSeennssoorrss AAvvaaiillaabbllee 3 Optical Based upon principle that nitrates and nitrates absorb certain wavelengths of light – a miniature spectrophotometer •Advantages: • No electrodes to replace • Continuous ultrasonic self cleaning •Disadvantages • Cost 3x of ISE • NNo ammoniia measurementt 4 Ion Selective Electrode (ISE) Based upon principle that electrodes ggenerate a mV outpput ppropportional to compound of interest •AAddvvaannttaaggeess:: • Low cost • Measure ammonium and nitrate in one package •Disadvantages • Requires manual or air cleaning • Requires replacement electrodes every other yyeeaarr 5 TThheeoorryy ooff OOppeerraattiioonn 6 Optical 200 nm 720 nm Influent Biological Tank Effluent e e e cc cc cc n n n a a a b b b r r r o o o s s s b b b aa aa aa wavelength wavelength wavelength 7 Continuous Ultrasonic Self Cleaning No maintenance Continuous cleaning No compressed air requirement After 1 week of installation, post trickling filter, pre aeration contact chhambber 8 ISE Sensor Design FFoouurr MMeeaassuurriinngg EElleeccttrrooddeess •NH -N 4 •NO 3 •K •Cl All electrodes can be exchanged individually New electrodes are automatically recognized 9 Relationship of Ammonia & Ammonium ammonium-ammonia-equilibrium NNHH + + OOHH- NNHH + HH OO 44 33 22 • Uncompensated NH + detection good up to approx. pH 8.5 4 •• ppHH vvaalluueess >> 88.55 NNHH ++:: ddeetteeccttiioonn rreeqquuiirreess ppHH ccoommppeennssaattiioonn 4 10
Description:The list of books you might like
