The Results The monitoring system has allowed FRWPCC to reduce chemical usage and operating costs, and provided valuable insights into treatment dynamics. Alum usage was reduced by over 5,500 gallons in the first 5 months of operation, saving the district an average of $1500 per month! This comes to an annual average savings of $18,000. With the YSI IQ SensorNet P700 Orthophosphate Analyzer, the operators were able to monitor orthophosphate concentrations and adjust the feed pumps based on those measurements. Furthermore, the data provided Rick with important information that was missing before. “I was surprised at how the trend graph looked throughout the day (figure 3). For instance, we can see the effects of ongoing construction projects and what that is doing to our process.” The data also revealed regularly occurring peaks, often on weekends, which is attributed to poor aeration control interfering with biological phosphorus removal. The plant is optimistic that an aeration system overhaul, currently in progress, will correct that situation. Rick and his team continue to seek ways to improve phosphorus removal. They are looking into purchasing a second P700 analyzer to monitor the sidestream from digestion and dewatering.
Savings with Continuous Online Monitoring and Control
Prior to P700
After P700
8,000 gallons per month
6,890 gallons per month
Alum usage
$10,000 per month
$8,500 per month
Cost for alum
$1500/month $18,000/year
Savings
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Figure 2: P700 Orthophosphate Analyzer 0.45 micron filter membrane on a slide rail
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Figure 1: YSI IQ SensorNet P700 Orthophosphate Analyzer
Figure 3: Trend Graph
IQ SensorNet
YSI.com/ww
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