Process Monitoring of Water and Wastewater Treatment
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1 February 7, 2018 Process Monitoring of Water and Wastewater Treatment MWEA 2018 JOINT EXPO AND OPERATORS DAY
2 Functions of a Process Monitoring System Compliance / Compliance Assurance Early Warning / Upset Detection Operational Efficiency / Process Control 2
3 Dissolved Oxygen (DO) Wastewater Compliance Aeration control / Energy efficiency Drinking Water Taste Corrosion control 3
4 Energy Efficiency D.O. 4 Source: Blum, D., High Efficiency Aeration, Clarifier, Ilinois WEA, Summer 2013
5 Polarographic DO Sensor O 2 H 2 O O 2 H 2 O O 2 H 2 O H 2 O e - e - O 2 H 2 O O 2 Membrane e - e - Cathode O 2 H 2 O Anode O 2 H 2 O O 2 O 2 H 2 O H 2 O O 2 O 2 H 2 O H 2 O H 2 O H 2 O Probe Solution Oxygen diffuses through membrane Oxygen reduced (consumed) at cathode Electrons flow = electrical signal (ma) Oxygen concentration proportional to signal level
6 Measuring Dissolved Oxygen using Luminescence The excitation fiber in the sensor emits a blue light causing the sensing element to glow, or luminesce red. 6
7 Measuring Dissolved Oxygen using Luminescence Oxygen is constantly moving through the Diffusion Layer, affecting the luminescence of the sensing layer. 7 The lifetime of the luminescence is measured by the sensor and compared against the reference and a stable dissolved oxygen concentration is calculated. The amount of oxygen passing through the sensing layer is inversely proportional to the lifetime of the luminescence in the sensing layer.
8 Water Treatment Process Monitoring Physico-chemical treatment ph Chlorine Turbidity Alkalinity Ortho-phosphate (PO 4 ) Total Organic Carbon (TOC) Sludge level Nitrate Dissolved Oxygen (DO) 8
9 Wastewater Treatment Process Monitoring Biological and Physico-chemical treatment Dissolved Oxygen (DO) Total Suspended Solids (TSS) Oxidation Reduction Potential (ORP) Sludge level Ammonia (NH 3 ; N -3 valence) Nitrate (NO 3- ; N +5 valence) Ortho-phosphate (PO 4 ) Chlorine ph 9
10 Process Monitoring System Components Universal Controller Display System settings Power supply Outputs 10
11 Process Monitoring System Components Sensors Measurement devices Signal processing
12 Instrumental Methods of Analysis / Signal Types Electrochemical Potentiometric Polarographic Optical Absorption Scattering Emission Fluorimetry 12
13 Ammonia / Ammonium Measurement Potentiometry ion selective electrodes (ISE) Colorimetry (absorption) cabinet analyzers 13
14 Potentiometry Sensor Design Ion Selective Electrode (mv) Reference electrode Membrane Junction 14
15 Ammonia / Ammonium Applications Wastewater Ammonia-Based Aeration Control 15
16 Ortho-Phosphate Detection & Measurement by Colorimetry sample with PO 4 3- reagent yellow mixing coloration photometer =420 nm
17 Ortho-phosphate Applications Drinking water Wastewater 17
18 Control of a Ferric Chloride Dosing Pump (Phosphorus Removal from Wastewater)
19 Turbidity, Total Suspended Solids (TSS) Detection by Light Scattering Backscatter (digested sludge) light absorbance / turbidimetry < 90 (mixed liquor) Nephelometry (clean water) 19
20 Turbidity / Total Suspended Solids Applications Drinking Water (compliance) Water or Wastewater (non-compliance) 20
21 Turbidity Measurement Standards ISO 7027 LED 860 nm DIN EN LED 860 nm US EPA Method 180.1Tungsten Filament ASTM D Tungsten Filament All methods: nephelometric 90 NTU = FNU = FTU 90 Use of LED 860 (nm) Weak sensitivity to very small particles No influence of colored samples Tungsten filament High sensitivity to small particles Influence by colored samples 21
22 Wastewater Activated Sludge Solids Monitoring System Immersion sensor in mixed liquor Insertion sensor in return activated sludge 22
23 Total Organic Carbon (TOC) Wastewater Surrogate parameter Water Reuse Drinking Water Disinfection byproducts 23
24 Basic Building Blocks of TOC Analysis Carbon Dioxide Sample Introduction Oxidation Detection Display 1. Syringe 2. Process/Online 3. Sample loop 4. Autosampler 5. Solids option 1. Combustion 2. Persulfate at 98 C 3. UV/Persulfate 1. NDIR (absorption) 2. Membrane Conductivity (electrochemistry) 1. Display 2. Printout 3. Computer 4. Strip Chart Recorder
25 TOC Analysis in the Drinking Water Treatment Process 25
26 Upstream Coagulant Control 26
27 Downstream DBP Mitigation 27
28 TOC Analysis A Different Method Carbon Dioxide Sample Introduction Oxidation Detection Display 1. Syringe 2. Process/Online 3. Sample loop 4. Autosampler 5. Solids option 1. Combustion 2. Persulfate at 98 C 3. UV/Persulfate 1. UV NDIR (absorption) 2. Membrane Conductivity (electrochemistry) 1. Display 2. Printout 3. Computer 4. Strip Chart Recorder
29 Direct UV Detection of TOC
30 TOC Monitoring for (Waste)Water Reuse Control ozone dosage Monitor treatment performance (upstream and downstream sensors) Not for compliance 30
31 Blanket Level Wastewater Sludge recirculation (ASP) Sludge removal Drinking Water Sludge removal 31
32 Sludge Blanket Depth Measurement Advantages: High resolution TSS profile Disadvantages Moving parts Limited sampling Advantages: Less fouling Continuous Long-term stability Disadvantages Fluffy sludge / ambiguous results 32 Optical Acoustic
33 Wastewater Activated Sludge Clarifier Q + Q ras MLSS Q Q ras 33
34 Contact YSI or Systems Specialties YouTube Facebook 34
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