O&M_Appendix_F__Benchscale_Treatability_Report.pdf

WATER REMEDIATION TECHNOLOGIES INC

Authorized Representative of Redux Technology

1317 Pennsridge Court, Downingtown, Pa 19035 Phone: 610-873-6894

August 11, 2014

Mr. David M. Miller Senior Hydrogeologist/Project Manager

ECC

110 Fieldcrest Ave.

2nd Floor Suite 31 Edison, NJ 08837

Re: DuPont Deepwater FUSRAP Site

Dear Dave:

Thank you for contacting me relative to ECC’s water treatment requirements for the DuPont Deepwater site. I appreciate your time and courtesy during my visit on 8/5/14.

The treatment system will use ion exchange resin to remove radioactive components. The pre-treatment is designed to remove iron, free product, suspended solids, and other dissolved metals, in order to protect the ion exchange resins.

Iron will be removed in a dedicated iron removal system with pH adjustment. The iron removal system is followed by a coalescing plate oil-water separator (OWS), and then a second, separate metals removal system. Activated carbon filters are located after the final clarification step, and precede the ion exchange media.

Groundwater evaluation:

Groundwater was tested with:

- Coagulants

- Flocculants

- Coagulant – flocculant combinations

These compounds were evaluated for water clarification.

- Twenty-six (26) chemicals or combinations of treatment chemicals were tested.

- Two sets of tests were conducted on each of the above (52 tests total). The groundwater was tested on as received basis, at nominal pH of 7.26, and at pH 8.6.

- Performance was tested at pH 8.6, as it is was anticipated that pH would be elevated to exceed 8.5 in the iron precipitation step.

WRT

1317 Pennsridge Ct, Downingtown, PA 19335 Phone: 610 – 873 - 6894

A sample identified as:

DuPont FUSRAP AOC-2 EB104 15 ft. bgs 7/29/14 Groundwater was provided by ECC for laboratory testing. The sample had a strong odor, similar to degraded landfill leachate which contains naphthenic compounds.

Baseline groundwater chemical characteristics:

pH 7.26 Oxidation Reduction Potential + 125 mV Total Dissolved Solids 994 mg/L

Test Program:

A Phipps and Bird multi-port gang stirrer was used to conduct multiple experiments. The Phipps and Bird unit allows the technician to evaluate different chemical compounds simultaneously, for visual comparison purposes.

500 milliliter samples of groundwater were evaluated in all tests, unless noted otherwise.

Samples were stirred at 150 rpm, for 30 seconds after addition of each chemical, then allowed to settle.

In order to obtain valid comparisons, all chemicals were dosed on a active ingredient basis (a.i.).

Treatment costs were calculated by converting active basis to product basis, then computing the cost based on list prices supplied by the chemical vendors.

Samples were evaluated for:

- Speed of reaction

- Clarity of treated water

- Sludge volume

- Sludge settling rate

Optimum candidates were isolated, then retested. Dose was gradually reduced in stepwise fashion to determine the minimum concentration required for acceptable performance. Use cost was then calculated based on minimum dose required to attain acceptable water quality.

A qualification is in order: The sample most likely represents a worst case scenario. It contains high solids. The groundwater treatment systems has provisions for solids separation in equilibrium tanks. As such, it is very likely that the groundwater entering the liquid – solids separation process will contain lower solids than the laboratory sample.

Chemical doses and subsequent treatment costs may be significantly less than predicted by the laboratory study.

Results:

1. It was not possible to obtain satisfactory treatment with flocculant (polymer) alone. The supernatant (clarified water) was turbid and contained sufficiently high concentration of suspended solids to interfere with downstream filtration.

This would create a situation requiring frequent backwashing of media filters.

2. The best coagulant at “as received” pH of 7.26 was aluminum chlorohydrate

(ACH).

3. ACH performance deteriorated as pH was increased from 7.26 to 8.6. ACH performance also declined at intermediate pH of 7.9.

4. A custom blended product, Redux A 29, was comparable to ACH at pH 7.26, and superior to ACH at (elevated) pH 8.6.

5. Dose of A 29 was 20% less than that of ACH.

6. Either ACH or A29 must be used in combination with a high molecular weight anionic polyacrylamide polymer (i.e. a flocculant).

7. The flocculant promotes rapid settling and good sludge dewatering.

Redux A 26 is a blend of an aluminum based coagulant and a low molecular weight polymer from the DADMAC (DiAmino DiMethyl Ammonium Chloride) family of compounds.

Estimated treatment cost:

Optimum performance:

Redux A 29 coagulant / anionic polyacrylamide flocculant program for all pH conditions.

A 29 dose: 500 ppm of A 29 P 853 5 ppm of P 853

Estimated treatment cost:

Product Consumption Cost Lbs/day Gal/day

A 29 480 44 $ 652 P 853 5 0.55 $ 11

Total $ 663 Cost per gallon $ 0.0057

Please note: The test groundwater contained extremely high concentration of suspended solids. The system is designed with settling tanks to remove suspended solids. I anticipate that the chemical dose will be reduced significantly in real proactive.

Typically a dose of 30 ppm of coagulant is used for clarification purposes.

This dose would reduce treatment costs by 94%, to $ 38 /day = $ 0.00033/gallon.

Chemical addition:

Redux A 29 should be added to the dual mix tank located ahead of the clarifier.

Coagulants require high mixing energy for optimum results.

Redux P 853 is a liquid emulsion polymer. It should be made down to a 0.25% solution prior to addition.

The flocculant should be added to the influent line ahead of the “flocculation tube” of the clarifier for optimum results. Flocculants require low shear mixing to promote particle size growth and rapid settling in the lamella clarifier...

I am available to travel to the site and assist with start-up and trouble shooting. Initial site visit is performed at no charge to the client.

Additional Information:

1. It may be necessary to add supplemental flocculant to the sludge which is withdrawn from the lamella clarifier to promote sludge dewatering. Provisions should be made for secondary addition of polymer to the sludge discharge line, or another point in the system which provides good contact with the sludge and low shear mixing.

2. The plant may wish to consider the use of Geotubes for sludge dewatering.

Geotubes are commonly used at construction sites. I will provide information under separate cover.

Procurement:

Redux A 29 is supplied in 55 gallon drums, net wt. 600 lbs., priced at $ 1.36/lb.

($ 816.00 per drum), FOB Baltimore MD.

Redux P 853 is supplied in 55 gallon drums, net wt. 450 lbs., priced at $ 2.44/lb.

($ 1098/drum), FOB West Haven, CT.

MSDS for each product are attached for reference.

Products may be ordered by contacting Greg Warnke at Redux Technology, 203-933-9071 or gwarkne@reduxtech.com.

Please contact me with any questions at 610-716-2561 or WRT1997@aol.com.

Thank you for the opportunity to be of service to ECC.

Regards, Gary Richards Technical Manager Water Remediation Technology, Inc.