Effective Removal of Total Organic Carbon (TOC) Using MIEX Ion Exchange Treatment J. Michael Barnes, PE.

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Presentation transcript:

Effective Removal of Total Organic Carbon (TOC) Using MIEX Ion Exchange Treatment J. Michael Barnes, PE

What is MIEX Project Background Why MIEX? Cost Analysis What are the results Presentation Outline

Ion Exchange Process by Orica that removes DOC Source: Ixiom Watercare What is MIEX?

Ion Exchange Process by Orica that removes DOC Source: Ixiom Watercare What is MIEX?

Source: Ixiom Watercare What is MIEX?

First plant started up in 2001 in Australia First US installation in 2005 in Florida First NC installation in Johnston County 2011 Second NC installation in Roxboro 2014 What is MIEX?

Roxboro, North Carolina. NOV in 2010 Average water treated per day is 2.6 MGD Maximum water treated per day is 3.4 MGD Plant capacity is 8 MGD Study looked at – Raw Water TOC concentration – WTP TOC removal efficiency – Distribution concentrations of TTHM’s and HAA’s Project Background

Raw Water Concentration Measurements – TOC average was 5.6 DOC average was 4.7 Project Background

WTP TOC Removal Efficiency – Was feeding alum at approx 60 ppm for coagulant – Average TOC after removal was 2.55 ( ) – Average TOC removal % was 50% ( )

Distribution Concentrations of TTHM and HAA – 4 Sample Sites - Averaged over 80 ug/l ( ) – 7 out of the 16 readings were above limits – Must meet Stage 2 by October 2015 Project Background

Distribution Concentrations of TTHM and HAA – 4 Sample Sites - Avg below 60 ug/l ( ) – 2 out of the 16 readings were above limits – Must meet Stage 2 by October 2015

Why MIEX? Ion Exchange versus chemical coagulant Investigated change from alum to: – Ferric Sulfate at 80 ppm – Carbon at 40 ppm Ran Life Cycle Cost Analysis for both solutions Compared at 4.0 MGD and 8.0 MGD

Why MIEX? 8.0 MGD 4.0 MGD Chem CoagMIEX Chem CoagMIEX Capital Cost Annual Chem Costs Annual Sludge Disposal Present worth at 7% 20 Yrs Total *Costs in Millions

Results Since 2015 Average TOC after MIEX is 1.34 (vs 2.55) Average Removal % is 75% (vs. 50%) TTHM average 51 ug/l (vs 81 ug/l) HAA average 21 ug/l (vs 44 ug/l)

Questions