SUSTAINABILITY THROUGH INNOVATION IN WATER ANALYSIS. Mdillon

Transcription

1 SUSTAINABILITY THROUGH INNOVATION IN WATER ANALYSIS Mdillon

2 CONTENT Who we are? Drinking Water : filter backwash What is innovation? Hach plays the leading role innovating in water analysis. Innovation Spotlight: COD, LDO, RTC 2

3 DANAHER IS DRIVEN BY DBS - DANAHER BUSINESS SYSTEM DBS is who we are and how we do what we do 4

4 BACKWASH OPTIMIZATION

5 FILTRATION Removal of particulate or microbiological contaminant Turbidity Suspended solids Colloids Bacteria Knowing when to start and when to finish your backwash

6 BACKWASHING Purge solids removed from water during filtration Solids collected on/within the filter are removed by reversing water flow up through the filter Restore/maintain filtrate flux

7 BACKWASH When to start backwash Run Time - depends on filters but hours max Head Loss foot head loss Particle or Turbidity Breakthrough 0.3 NTU particle counts increase When to stop backwash Pre-set time period Visual operator inspection Volume Turbidity results

8 WHY MONITOR BACKWASH Under washing Accumulation of solids in the bed Mudballs Cementing portions of the bed Poor quality water Short filter runs Over washing Excess water use Short filter runs loss of filter media Increased operations costs Ineffective filter ripening

9 TURBIDITY TO DETERMINE BACKWASH DURATION Why turbidity? Turbidity reduction is primary purpose of filtration Time based backwash can often lead to under backwash or over backwash The American Water Works Association (AWWA) has recommended terminating backwash when the turbidity is in the range of 10 to 20 NTU in order to leave enough particulate matter within the filter to sustain effective performance during the beginning of the next filter run.

10 BACKWASH TURBIDITY Hach Solitax sc in-line Turbidity Sensor to monitor filter backwash provides consistency in the wash process based on a real time turbidity measurement The mounting allows the probe to be place directly in the filter trough or near the top of the bed for optimal measurement Use of turbidity meters will ensure that backwash cycles happen only when necessary. This saves power! Most cycles are timed. Whether the filter needs it or not at a certain time the filter is cleaned. Use of a turbidity analyzer will cause backwashed only when necessary and will turn off the cleaning cycle when the turbidity reaches a pre set level

11 CASE STUDY: NEW SALEM WATER TREATMENT PLANT, BETHLEHEM TOWN, NEW YORK

12 NEW SALEM WATER TREATMENT PLANT Capacity Filtration type Raw Water Finished Water Backwash Criteria (Before) Backwash duration (Before) : 6 MGD : Rapid Sand Filter (12 Filters) : approx. 3 NTU : approx NTU : 96 hrs filter run time, 6 ft head loss, 0.2 NTU filter effluent (whichever comes first) : 10 min high rate wash, with surface wash 13

13 APPROACH Solitax Turbidity/Solids sensor Infrared light source, reduced colour interference Wide measuring range of up to 4000 NTU Installed above filter media

14 15 BETHLEHEM, NY BASELINE BACKWASH TURBIDITY PROFILE

15 16 BETHLEHEM, NY MODIFIED BACKWASH TURBIDITY PROFILE

16 BETHLEHEM, NY COMPARING PROFILES 6 mins of savings per filter 17

17 RESULTS Good agreement between backwash turbidity profiles Confidence with using turbidity profiles for backwash Reduced high flow backwash by 50%, from 11 to 5 mins Increase productivity by reducing waste water Energy saving Save approx. 7.5 MG (12 filters) of water annually About USD $15,000

18 INNOVATING WATER ANALYSIS

19 INNOVATION SPOTLIGHT A leader in industry firsts: COD LDO RTC

20 COD A TRUE INNOVATION Developed by Dr. Bruno Lange in 1975 Pre-measured reagents Quick and accurate Less time, less glassware Reduce errors Environmentally friendly Barcode to eliminate error Automatic Wavelength detection 10 x measurements (rejects abnormal readings) In EU recycling avaiiable ISO approved 27

21 LDO HOW IT WORKS Blue light is transmitted to the sensor The luminescent molecules in the sensor are excited by the blue light The molecules relax emitting red light The red light is detected by the probe Photo Diode The Life Span of Luminescence is the time required for the molecules to relax from their excited state. Transmitted Blue Light Low maintenance No Drift and no contamination Plug and Play with Hach s digital technology 28 Reference Red LED Emitted Red Light

22 RTC: REAL TIME CONTROL Control on/off aeration through ammonia & nitrate. Add just enough DO to meet the ammonia setpoint. Feed just enough chemical to meet setpoint. Feed exact polymer to meet sludge density setpoint. Tighter Process Monitoring and Controls Minimizes operational costs (energy, chemicals) Calculate & maintain the best SRT for your system.

23 OPTIMIZING INNOVATION What benefits does optimizing bring? DID YOU KNOW? Austria began measuring and optimizing wastewater treatment plants 10 years ago. As a result they are seeing much reduced power consumption with the average power use decreasing by over 40%. Austria now has some of the lowest power use per population equivalent of wastewater treated. Switzerland and Germany are following the same process to achieve reductions and have produced benchmark requirements to promote energy savings. 23 kwh/pe.year kwh/pe.year

24 EU Cohesion Fund in Water Sector to promote Sustainable Growth

25 THANK YOU FOR YOUR ATTENTION