1. Proactive and Multi-Barrier Treatment Approach for Taste-and-Odor Compounds and UCMR4 Cyanotoxins: The Lafourche Parish Water District Experience
Amlan Ghosh, Chad Seidel - Corona Environmental Consulting, LLC
Jared Allemand, Jenny Robichaux – Lafourche Parish Water District #1
Southwest AWWA 2018 Annual Conference
October 29, 2018

2. Acknowledgements Lafourche Parish Water District #1: Corona:
Dirk Barrios
Addis Landry
Scott Thibodeaux
Corona:
Eli Townsend
Keck & Wood:
Michael Moffitt
Wayne State University
Dr. Judy Westrick
Jonna Birbeck

3. Presentation Outline LPWD historical T&O issues PAC evaluation
Partial & full plant trials
WTP improvements
Cyanotoxin treatability tests
Conclusions

4. Water System Overview

5. T&O Events - 2014 ≤5 complaints 6-19 complaints ≥20 complaints 2014
06/24
06/30
07/06
07/12
07/18
07/24
07/30
Increased PAC and MnO4 (11)
Jun 26
(7)
Jun 29
Increased PAC (53)
Jun 30
Increased PAC and ClO2 (20)
Jul 1
Odor in Tap at POE, Contacted solution providers, ATP increased from bayou to reservoir (40)
Jul 3
Norit confirms carbon type is correct (12)
Jul 8
Increased MnO4 (12)
Jul 9
Dialogue with Jim Bromka (Rochester) regarding experience with T&O events. They use a process consisting of roghing filters followed by H2O2/UV AOP (0)
Jul 16
Met with Terrebonne to discuss the influence of chloraphyll (0)
Jul 18
MnO4 jar tests at both plants (0)
Jul 25
Decreased MnO4 (7)
Jul 28
Cu in POE 0.04 mg/L, Reservoir overflow (7)
Jul 30
Reservoir flushing (2)
Aug 1
Increased PAC, Increased MnO4 (0)
Jun 24
Increased PAC (9)
Jun 25
Increased MnO4 (21)
Jun 27
(8)
Jun 28
Call LADHH and news regarding T&O, Increased ClO2 (46)
Jul 2
Reservoir Overflow (2)
Jul 6
Contacted Norit regarding PAC type (17)
Jul 7
Met with Terrebonne (5)
Jul 10
Odor in Bayou Blue (5)
Jul 11
Odor in Bayou Blue back to normal, Expecting UVT monitor (0)
Jul 14
DO meters ordered (0)
Jul 15
(1)
Jul 17
Permit for CuSO4 system recinded (3)
Jul 21
Increased MnO4 and PAC, CuSO4 Permit approved, floating algae on surface of reservoir, reservoir overflow (7)
Jul 29
Discussed various sludge removal options from North reservoir, decided not to shock treat reservoir, reservoir flushing, reservoir overflow showed a decrease in ATP, switch to regular overflow and flushing (7)
Jul 31
(3)
Aug 4
≤5 complaints
6-19 complaints
≥20 complaints
Today

6. Process Flow Diagram Bayou To Distribution System Reservoir
Rapid Mix/Flocculation/Sedimentation
Dual Media (sand- anthracite) Filters
Clearwell
Ground
Storage
Permanganate
Chlorine
Polymer, Alum, Fluoride, Lime, Ammonia, ClO2
PAC
Zinc Orthophosphate, Ammonia, Chlorine

7. Response to Algae Events

8. T&O Study: 2015-2018 Develop T&O Monitoring Program
Establish monitoring plan
Collect data:
Develop alert and action levels based on collected data
WTP T&O Control Strategies
Powdered activated carbon testing
Bench-scale
Full-scale:
Obtained approval from LDH
Two rounds of partial plant trial in 2016
One round of full plant trial in 2017

9. MIB Results: 2015

10. T&O Treatment Strategies – Jar Tests
Evaluate current treatment processes
Using jar testing, determine the effectiveness of 5 PAC types for T&O removal
Specifically, determine:
Best PAC type for optimal T&O removal
Best PAC dose for optimal T&O removal
Best PAC addition location for optimal T&O removal 10

11. PACs Used in Jar Tests PAC Product Cabot Hydrodarco B Hydrodarco C
Norit
PAC 20BF
Calgon
WPH-1000
PULSORB WP260-90
Size Distribution
Less than 150 µm: 99%
Less than 45 µm: 65%
Less than 45 µm: 90%
Less than 75 µm: 95%
Density
0.51 g/mL; 32 lb/ft3
g/mL
Iodine Number
500 mg/g
800 mg/g
1000 mg/g 11

12. PAC Jar Test Results

13. Jar Test Results Best PAC type for optimal T&O removal
Calgon Carbon WPH-1000 or equivalent
Best PAC dose for optimal T&O removal
50 mg/L provided > 90% MIB removal
Best PAC addition location for optimal T&O removal
In the rapid mix basins 13

14. 3 Rounds of Partial and Full Plant Trials

15. Improvements at North WTP
LDH review and approval (April – May 2017)
New PAC treatment used since summer 2017
New feed location at rapid-mix instead of sedimentation basin
Maximum dose capability of 50 mg/L
New PAC product (higher iodine number being used)

16. Cyanotoxins Evaluation
10-day Health Advisory (µg/L)
Bottle-fed Infants
School-age and Older
Microcystin-LR
0.3
1.6
Cylindrospermopsin
0.7 3
Test removal of all 10 UCMR4 cyanotoxins
Test simultaneously in presence of T&O compounds (MIB)
Four pre-approved PACs for T&O removal
Use same dose and application location as for T&O removal

17. Cyanotoxins & MIB concentrations
Target Initial Concentration (µg/L)
MC-LR
3.1
MC-RR
MC-YR
MC-LA
MC-LF
MC-LY
Total Microcystin
18.6
Anatoxin 10
Nodularin
6.2
Cylindrospermopsin
2-MIB
0.1

18. Jar Test Results Product ID PAC A PAC C PAC D PAC E Product Name
WPH-1000
AquaNuchar
W-PL 900
AquaSorb CB1-MW
Microcystin-RR
27%
80%
65%
82%
Microcystin-YR
26%
78%
45%
Microcystin-LR
35%
51%
68%
Microcystin-LA
33%
44%
Microcystin-LY
31%
84%
60%
81%
Microcystin-LF
39%
79%
56%
85%
Total Microcystin
54%
Nodularin
18%
Anatoxin
24%
55%
Cylindrospermopsin
75%
91%
Average
32%
76%

19. Jar Test Results – Total Microcystins

20. Jar Test Results – Total Microcystins

21. Jar Test Results – Cylindrospermopsin

22. Jar Test Results – Anatoxin

23. Comparison of ELISA vs LC/MS/MS

24. Removal of T&O vs. Cyanotoxins

25. Recommendations/ Conclusions
T&O Removal:
Pre-qualified PAC product successfully reduces T&O to lower than threshold levels
Application of PAC in rapid mix (vis-à-vis sedimentation basin) provides additional benefit in T&O removal
Up to 50 mg/L of PAC dose necessary
PAC dose driven by triggers based on T&O monitoring

26. Recommendations/ Conclusions
Cyanotoxins Removal:
Partial removal of cyanotoxins with PAC
Treatment targets to be determined based on future regulatory levels, initial concentrations, water quality conditions, etc.
Percent removal of individual cyanotoxins with PAC application vary
Excellent removal of cylindrospermopsin
Moderate removal of most microcystins
Poor removal of anatoxin
Relative performance of PACs for cyanotoxin removal similar to those for T&O removal

27. Corona Environmental Consulting
Proactive and Multi-Barrier Treatment Approach for Taste-and-Odor Compounds and UCMR4 Cyanotoxins: The Lafourche Parish Water District Experience
Amlan Ghosh, Ph.D., P.E.
Corona Environmental Consulting
Phone: (214)