Immediate Free Chlorine Correction for Fluctuating Flow & Changes in Water Quality. Sadiq Khan May 25th, 2016
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1 Immediate Free Chlorine Correction for Fluctuating Flow & Changes in Water Quality Sadiq Khan May 25th, 2016
2 3 Main Current Methods Of Dosing Chlorine Manual dosing with adjustment based on sampling Online free chlorine measurement and using a closed control loop to adjust the dosing of chlorine Chlorine Dosing based on water flow ratio Seite 2
3 Manual Dosing Based On Samples The most inconsistent chlorine dosing method is to take manual samples and adjust the pumps accordingly. This system does not allow for immediate correction to the changes in flow rate or water quality. The accuracy depends on the intervals of the sample and human error. Seite 3
4 Flow to Water Ratio Dosing Dosing using chlorine to water ratio is set this is certainly an improvement. With this system the changes in the flow rate will have an instant effect on the disinfectant dosing. However if the water quality changes, this can result Seite 4
5 PID Loop Based On Free Chlorine Measurement Using a free chlorine online sensor combined with a close loop controller is one of the better methods to maintain a preferred dead band. One of the shortcomings of the online free chlorine measurement technologies is the response time, which can range between 120 seconds to 5 minutes. During this period it is possible for a reasonable amount of untreated water to be dispensed. Seite 5
6 Basic Information Chlorine What is Free- (FCL), Total- (TCL) and bound Chlorine (BCL)? Chlorine added Initial chlorine concentration added to water Total Chlorine (TCL) Remaining (reducible) chlorine concentration after chlorine demand of water is met Chlorine Demand Reactions with organic and inorganic material, metals, other compounds present in water prior to disinfection Free Chlorine (FCL) Concentration of chlorine available for disinfection Bound Chlorine (BCL) Concentration of chlorine combined with organic and inorganic nitrogen compounds in the water. Not as effective for disinfection (like FCL) Seite 6
7 Basic Information Chlorine Measurement Characteristics of Type 8232 Electrochemical technology designed for measuring Free Chlorine Response time in changes to reach equilibrium is 30 seconds Concentration of FCL needs to be from inorganic sources such as chlorine gas or sodium hypochlorite Membrane cap is filled with electrolyte solution which is separated from the ionic substance of the measurement water only allowing the disinfectant or chlorine to pass through The diffusion of the substance through the membrane ensures that the concentrations on both sides of the membrane are equal and causes an electrical signal at the electrode Seite 7
8 Type 8232 Chlorine Sensor Design Usage of Chlorine Sensor ID Perfect for.. Chlorine Sensor ID measuring chlorine in water with constant ph-value..measuring chlorine in media with potable or process water quality Benefits to the customer: Cost-efficient chlorine sensor Excellent long term stability: loss of slope < 1% per month Hints: Short run-in-time: 30 minutes Easy 1-point slope calibration with reference value (DPD1 - Photometer) ma-signal; 2-wire device; powering with signal Water must contain some chlorine for membrane protection (avoidance of bio-fouling) ph-range ph 6..8; ph must be constant Water must not contain any surfactants Suitable for chlorine generated by membranecovered electrolysis-cell (covered cells only!) Use another sensor (ID ) for measurement of very low chlorine concentrations (0,005..2ppm) for measuring the absence of chlorine for water which contains no disinfectant Use another sensor (ID ) for applications with fluctuating ph-value for water with surfactants Seite 8
9 New Solution - Flow Ratio Dosing Combined with Free Chlorine PID Loop Seite 9
10 Burkert Dosing System Benefits Seite 10
11 Sodium or Calcium Hypochlorite Dosing System Seite 11
12 Thank you! Bürkert Fluid Control Systems PO Box 17015, RAK Free Trade Zone Ras Al Khaimah United Arab Emirates Tel: Fax: Sadiq.Khan@burkert.com We make ideas flow.
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