PW E-Cell Treatment Report - Nickel Rinse Water

 

Company personnel provided NEAT with 2 – five gallon containers of Nickel Rinse Water taken from the rinse tank.  At the time of the water sample collection, it was mentioned that there were contamination concerns in the rinse water, but was representative of the normal nickel rinse water operations.

 

NEAT personnel completed PW E-Cell treatments on this nickel rinse water in their shop in Kelowna, B.C.  There was 1 - raw water sample taken and during the PW E-cell treatment operations, there were 2 – different treated water samples taken.  All three samples were taken into Caro Labs in Kelowna for analysis for the nickel concentrations in the raw water and the two treated samples.  The Caro Lab Certificate of Analysis is attached to this report and the results are shown below. 

 

Objective of the initial PW E-cell test was to develop a treatment procedure for treatment of the nickel rinse water and to see if the treated water from the PW E-cell treatment would be suitable for recycling to the nickel rinse tanks.  NEAT has presented the following information to All Brite management for their review.  From test results, we believe it is reasonable to believe that the system will work very well.  Powell Water has similar systems currently operating in the US.

 

 

Figure 1.0 -  Raw Nickel Rinse water as taken from the Sample

provided Company personnel.  At pH 6.51

 

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As shown in the sample above there was some whitish colouring to the raw nickel rinse water.  There was no sludge in the effluent or settlement to the bottom of the pail prior to PW E-cell treatment.

 

The raw water sample for lab analysis, was taken form the nickel rinse water in the pail.  At this time, the pH was taken and was @ pH 6.51.  When the PW E-cell treatment was done, there was “No” pH adjustment done.  If the nickel rinse water can be ecell treated without pH adjustment, then the pH probe and metering pump for caustic addition will not be required, providing savings in the equipment set, less maintenance and much cleaner treatment process. 

 

The first 50% of the 5 gallons of effluent was ran through the ecell @

 

4 chamber @  27v. x 20 amp at about 65% power

 

    The treated water and floc flow over the weir provided clear water

    With dark green to black floc which precipitated very quickly.

 

 

Fig. 2.0 – PW E-cell chamber with overflow treated water.

Clear water with development of floc at top of chamber.

 

The second 50% of the 5 gallons of effluent was ran through the ecell @ 

(power on amps increase to full power)

 

4 chamber @  50v. x 25 amp at about 100% power

 

    The treated water and floc flow over the weir provided clear water

    With dark green to black floc which precipitated very quickly.

    There was a yellowish tinge to the water, indicating that there was

    Too much power being used and ferric being placed into the water.

                       

                        ( see figure 3.0 below )

 

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Figure 3.0 – Comparison of 100% to the left and 65% power

To the right and the yellowish tinge in both columns.  pH 7.45

 

From the two test runs, we felt that the 4 chamber treatment was to high a usage of power and at this point switched the electrical connections on the chamber down to a two chamber configurations.  This will save on power consumption and steel plate consumption.

 

 

Figure 4.0 – Treated water flow over weir with

2 chamber treatment.  Clear water with green floc.

 

 

 

 

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The second 5 gallon pail of effluent was ran through the ecell @ 

 

2 - chamber @  110v. x 5 amp at about 95% power

   

    The treated water and floc flow over the weir provided clear water

    With dark green to black floc which precipitated very quickly.

    There was no yellowish tinge to the water, indicating that there was

                            reasonable power being used.

 

 

Figure 5.0 – PW E-cell treated nickel rinse water collected during

Treatment with 2 chambers.   Clear water and rapid floc precipitation.

 

The ecell treatment of the nickel rinse water went very will in 2 - chambers and it may be possible to treat the rinse water with just one chamber.  This would require further tests, but as shown below and on the attached Certificate of Analysis from Caro Labs, the best treatment result for reduction of nickel in the rinse water was with the 2 – chambers.

 

Certificate of Analysis

Caro Labs

May 19, 2005

                        Sample ID / Parameter                      Units               Results

                        __________________________________________________

                        #3 ABM Raw                                      mg/L                16.1

 

                        #3 ABM ECT 4 ch                               mg/L                2.8

 

                        #5 ABM ECT 2 ch                               mg/L                <0.02

 

The floc settlement rate of the PW E-cell treated water with both of the treatments using 4 – chambers and 2 – chambers were about equal.  There was very good and rapid precipitation in both sample columns.  The sludge generation was very low and should dewater through either a dewatering tub or filter press.  The sludge was not analyzed for the Alberta TCLP Leachate process, but is expected to meet leachate standards for Industrial landfill disposal.

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Figure 6.0 -  The floc precipitation is heavy and settles fairly quickly.

The column shown above is about 30 sec after sample from chamber.

 

 

 

Figure 7.0 – Floc settlement after 1 min from the

Above column in Figure 6.0

 

 

 

 

 

 

 

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Figure 8 – 24 hour settlement time.  Column on left is 4 – chamber treatment

With the column on right is the 2 – chamber treatment, with 50 ml of sludge from 1000 ml sample

 

The PW E-Cell tests were very successful and the Nickel rinse water treated easily at the effluent pH that was collected from the rinse tank.  From the test, we would expect that the only requirement for the rinse water to be recycled to the rinse tank system would be the separation of the sludge from the ecell treated water by filter bag or filter press.  A polishing bag filter might be used to filter out the small pin floc.  The ecell treated water could either go to a holding tank or back to the rinse tank system.

 

NEAT will send an estimated cost for the Powell Water 3 gpm E-cell, plumbing and valves.  All Brite may have all of the pumps, filters and tanks that could be adjusted to work with the ecell treatment and filter system.  We would suggest that a basic manual control system be installed as to valves and plumbing and then any automated valves and flow regulators, be added as required.  The PW E-Cell has a control panel and PLC control system on it for some automation.

 

We have attached a flow chart that we believe would work well for the ecell treated decant water and floc separation.  Once management have had a chance to review this test report, the flow chart and cost estimate, the we will review the material with Management and make adjustments as required and provide a final quotation for supply of the Powell Water E-cell and equipment as required.

 

 

Presented by :  Ken Gardner,

                        President

                        N.E.A.T. Environment, Inc.

 

                        May 27, 2005