Change Order Number One Purchase Order for Ferric
Change Order Number One Purchase Order for Ferric Chloride Use South Shore Water Reclamation Facility Commission Agenda Item # 9
Ferric Chloride (Fe. Cl 3) Use at SSWRF • Veolia used Fe. Cl 3 between 2008 and 2012. • Used for phosphorous removal • Provided benefit of additional BOD removal in primary clarifiers • Reduced BOD loading to aeration system – Potential improved plant performance – Reduced aeration demand 2
Fe. Cl 3 Use at SSWRF • Between 2009 and 2012, Veolia gradually reduced use of Fe. Cl 3 • Substituted ferrous chloride (Fe. Cl 2): ~1/3 cost of Fe. Cl 3 • Since 2016, SSWRF has had challenges meeting plant capacity and effluent quality • Change from Fe. Cl 3 to Fe. Cl 2 is one differing condition 3
Previous Short Term Pilot Test • MMSD and Veolia conducted a short-term pilot to feed Fe. Cl 3. • Short durations at different dosage rates of both Fe. Cl 3 and Fe. Cl 2. • Saw improved BOD removal in primary clarifiers with Fe. Cl 3 as compared to Fe. Cl 2. 4
Proposed 3 Month Test • To better understand all impacts, now propose a 3 month Fe. Cl 3 test. • Change other operational conditions at SSWRF to be similar to 2008 -2010 operations. • Isolate impacts of changes in operations from changes in characteristics of wastewater influent. • Determine advantages and disadvantages to treatment process and plant operations. 5
Commission Request • Staff/VW initiated 3 -month test in mid-May. • District paying incremental cost of test, totaling $336, 960. • Initial purchase order issued to VW using ED Authority: $149, 760. • Request to authorize change order in amount of $187, 200 for remaining amount. 6
QUESTIONS? 7
- Slides: 7