batch removal report for community water may 20, 2020...jun 25, 2020 · 6:2 fts 53.5950.7 ppt 83.9...
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Batch Removal Report For Community WaterMay 20, 2020
© 2020 Cyclopure, Inc.
Prepared By:Dr. Yuhan LingMichael Payne
Cyclopure, Inc.Technology Center
8045 Lamon Ave, Ste 140Skokie, IL 60077, USA
DEXSORB+ TECHNOLOGY TOREMOVE PFAS
Overview The purpose of this work is to systematically investigate PFAS uptake behavior on powder DEXSORB+ in PFAS-impacted process water samples from XXXXX, MI. By performing batch experiments at a series of relevant sorbent concentrations, the uptake for a total of 11 PFAS by DEXSORB+ in XXXXX water has been determined. The resulting uptake data was analyzed to calculate the percent removal for individual PFAS at varying doses of DEXSORB+ at different sampling time points. The results for percent removal of each PFAS are provided in Table 1. Uptake data for combined PFOA and PFOS levels as a function of dose and time is shown in Figure 1. Results for the full group of PFAS are presented in Figures A1 and A2 of Appendix A. Based on the experimental outcomes, the powdered DEXSORB+ application is expected to be a highly efficient and effective treatment process for PFAS removal in XXXXX water. At each dosing increment, the overall PFAS removal increased successively, with 100 mg/L removing 83% of total 2,632 ppt background PFAS in 15 minutes. Dosing of 20 mg/L not only reduced overall background PFAS by 50%, but also lowered levels of three PFAS to non-detect. 50 mg/L removed both short and long chain PFAS compounds, and lowered five PFAS to non-detect. Dosing at 100 mg/L brought overall PFAS down by 83% and reduced the most concentrated PFAS, PFOA and 6:2 FTS by over 90%. DEXSORB+ has the following properties and characteristics:
Michigan PFAS MCLs:
PFAS Background and Uptake Summary by DEXSORB+ Batch experiments were performed on tumblers with a series of representative sorbent doses from 20 mg/L to 100 mg/L. Water samples were collected and analyzed at time points of 15 minutes, 60 minutes, and 24 hours. The water samples were analyzed with Cyclopure standard methods on HPLC-MS/MS (Thermofisher, QExactive). For each adsorbent dose and time point, triplicate was performed to quantify error and guarantee the reliability of each data point. The removal of each PFAS at 15 minutes is presented in Table 1. Table 1. Summary of PFAS background concentration and the removal percent at 15 minutes.
Compound Background Concentration 20 mg/L
a 50 mg/L
a 100 mg/L
a
PFBA 162.3 ppt 6.0 9.4 16.7 PFPeA 269.6 ppt 10.8 24.2 45.8 PFHxA 340.6 ppt 23.7 52.7 75.9 PFHpA 228.4 ppt 44.4 76.1 90.7 PFOA 469.6 ppt 67.2 89.8 96.4 PFOS 14.2 ppt 100.0 100.0 100.0 PFNA 100.3 ppt 81.7 100.0 100.0 PFDA 41.5 ppt 100.0 100.0 100.0 FPePA 14.7 ppt 8.4 100.0 100.0 6:2 FTS 950.7 ppt 53.5 83.9 94.5 8:2 FTS 40.2 ppt 100.0 100.0 100.0
Total PFAS 2,632 ppt 1,408 ppt 768 ppt 454 ppt aThe values represent the percentage removal at 15 minutes. Based on the similarity between results at 15 minutes and 60 minutes, rapid kinetics have been demonstrated for DEXSORB+, which is consistent with previous tests performed with other matrices. DEXSORB+ exhibited significant PFAS removal at all three sorbent doses. From Table 1, it is recommended to use a dose approximating 100 mg/L DEXSORB+ to treat the PFAS-impacted water at XXXXX and come within Michigan PFAS MCLs. This dose level will also ensure that both short and long chain PFAS will be sufficiently removed to acceptable levels. To sum up, this batch study demonstrates powdered DEXSORB+ as a highly efficient and cost-effective treatment process for PFAS removal from XXXXX water.
Figure 1. PFOA+PFOS Residual Concentration relating to the Michigan Combined MCL
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PFOA+PFOS Concentration vs DEXSORB+ Dose15 Minutes 1 Hour 24 Hours Michigan Combined MCL
APPENDIX A.
Figure A1. Percent Uptake of 11 detected PFAS at 20 mg/L and 50 mg/L doses of DEXSORB+. Error Bars, minimum and maximum uptake
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PFBA PFPeA PFHxA PFHpA PFOA FPePA 6:2 FTS PFNA PFOS PFDA 8:2 FTS
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Percent Uptake with DEXSORB+ at 20 mg/L
15 Minutes 1 Hour 24 Hours
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PFBA PFPeA PFHxA PFHpA PFOA FPePA 6:2 FTS PFNA PFOS PFDA 8:2 FTS
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Percent Uptake with DEXSORB+ at 50 mg/L
15 Minutes 1 Hour 24 Hours
Figure A2. Percent Uptake of 11 detected PFAS at a 100 mg/L dose of DEXSORB+. Error Bars, minimum and maximum uptake
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PFBA PFPeA PFHxA PFHpA PFOA FPePA 6:2 FTS PFNA PFOS PFDA 8:2 FTS
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Percent Uptake with DEXSORB+ at 100 mg/L15 Minutes 1 Hour 24 Hours