EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale

Daniel, Richard C.; Billing, Justin M.; Bontha, Jagannadha R; Brown, Christopher F.; Eslinger, Paul W.; Hanson, Brady D; Huckaby, James L; Karri, Naveen K.; Kimura, Marcia L; Kurath, Dean E; Minette, Michael J

doi:10.2172/973405

Cited by 7 publications

(28 citation statements)

References 6 publications

(16 reference statements)

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“…For comparison, flux loss for the ~3-vol% PEP simulant is typically around 25% during the initial period of filtration and immediately after the backpulse series at 100-hrs. First, it should be noted that the difference in irreversible flux loss is not a result of the different test scheme (100-hour test in Series 1 versus 36-hour backpulsed test in Series 2), as a 36-hour test format of the PEP simulant slurry on the 2-foot CUF filtration system also showed a 25% flux loss (see Daniel et al 2009b). Thus, it is likely that the reduced loss of flux observed for the boehmite component results from lower solids concentration relative to the PEP simulant or from the difference in suspending phase chemistry.…”

Section: Component Test Resultsmentioning

confidence: 99%

“…In PEP, a disparity in the initial flux measured on CUF and PEP filtration systems for the same PEP simulant tested herein was reduced by repeatedly backpulsing the filters to condition them against the slurry solids. The results presented in Daniel et al (2009b) suggested that repeated backpulsing of the filters caused irreversible fouling. From the current result, it is less clear if the single series of backpulses at 100 hours, the 100-hour filtration period, or both are the primary contributors to irreversible fouling.…”

Section: Backpulsing Effectivenessmentioning

confidence: 94%

“…This observation is significant, as it indicates that low operating TMPs yield better filter throughput relative to high TMPs when the filter is operated for long-times without backpulsing. This behavior may be important for process optimization in filtration operations where backpulsing is avoided because it yields an increase in the rate of irreversible filter fouling (such as that observed in low-solids scaling tests in Daniel et al 2009b). …”

Section: Flux Behavior Before Backpulsingmentioning

confidence: 98%

“…In one such study, post-caustic leach dewatering of waste was studied; the test results were cause for concern because the dewatering process took significantly longer than planned because of an unexpected and significant loss of filter performance (i.e., relative to that measured in bench-scale studies, see Daniel et al 2009b). Should similar conditions exist in the full-scale process, then waste throughput will be significant hindered, and the timeline for and costs associated with completing remediation of the Hanford site will be significantly extended beyond current estimates.…”

Section: Need For Additional Fouling and Chemical Cleaning Studiesmentioning

confidence: 99%

“…Previous filtration testing (e.g., Daniel et al 2009b) has only studied filter flux dynamics over relatively brief periods of operation (4-12 hours) with respect to expected filtration operation times at WTP (on the order of 100 hours). Analysis of previous filtration campaigns evidenced continued flux decline over the entire duration of filtration testing, and as such, the existence of a filtration steady-state could not be evaluated.…”

Section: Testing Approachmentioning

confidence: 99%

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Filtration Understanding: FY10 Testing Results and Filtration Model Update

Daniel¹,

Billing²,

Burns³

et al. 2011

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SummaryThis document completes the requirements of Milestone 2-4, Final Report of FY10 Testing, discussed in the scope of work outlined in the EM31 task plan WP-2.3.6-2010-1. The focus of task WP-2.3.6 is to improve the U.S. Department of Energy's (DOE's) understanding of filtration operations for high-level waste (HLW) to improve filtration and cleaning efficiencies, thereby increasing process throughput and reducing the Na demand (through acid neutralization). Developing cleaning/backpulsing requirements will produce much more efficient operations for both the Hanford Tank Waste Treatment and Immobilization Plant (WTP) and the Savannah River Site (SRS), thereby significantly increasing throughput by limiting cleaning cycles. Indeed, current program results derived from Pacific Northwest National Laboratory (PNNL) studies indicate that a ~35% increase in filter throughput can be achieved by optimization of backpulse frequency alone. In this report, the results of FY10 testing conducted under EM31 task plan WP-2.3.6-2010-1 are presented and discussed. The scope of this work is to develop the understanding of filter fouling to allow developing this cleaning/backpulsing strategy.The overall approach to this task is:  Review previous cross-flow testing at SRS, PNNL, and other peer review journals to direct testing activities for this task. Develop a predictive model that reflects the important physical mechanisms of fouling and cleaning for use in determining effective filter cleaning strategies for a variety of feeds. Develop simulants that can result in significant irreversible fouling, but also are representative of the types of materials that are present in HLW. Test these simulants in bench-scale equipment to identify the cleaning requirements for these feeds. Develop a cleaning strategy to optimize throughput while minimizing added Na. Validate the model and operational strategy with actual waste samples as appropriate.The FY10 work discussed in the current report focused on tests that would improve understanding of filter fouling dynamics to allow development of improved filtration models. To this end, three filtration test programs were conducted to provide insight into dynamics of filter fouling and the efficacy of flux recovery operations, including both backpulsing of the filter and chemical cleaning regimens. The three testing programs were: Series 1, Long Term Fouling Tests -examined flux decline when filtering the Pretreatment Engineering Platform (PEP) waste simulant slurry for long periods of time without backpulsing. Previous filtration testing has only studied filter flux dynamics over relatively brief periods of operation (4-12 hours) with respect to expected filtration operation times at WTP (on the order of 100 hours). The aim of Series 1 testing was to answer this need. Series 2, Component Fouling Tests -determined the filtration behavior of the major components that comprise the PEP simulant. By examining each solid component separately, the nature of particle-particle and particle me...

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Section: Component Test Resultsmentioning

confidence: 99%

Section: Backpulsing Effectivenessmentioning

confidence: 94%

Section: Flux Behavior Before Backpulsingmentioning

confidence: 98%

Section: Need For Additional Fouling and Chemical Cleaning Studiesmentioning

confidence: 99%

Section: Testing Approachmentioning

confidence: 99%

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Filtration Understanding: FY10 Testing Results and Filtration Model Update

Daniel¹,

Billing²,

Burns³

et al. 2011

Self Cite

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A history of Hanford tank waste, implications for waste treatment, and disposal

Colburn¹,

Peterson²

2020

Env Prog and Sustain Energy

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More than 40 years of plutonium processing have left almost 56 million gallons of mixed radioactive waste sequestered in 177 underground tanks on the Hanford Site. Three different processing technologies were employed for plutonium purification in addition to uranium scavenging and fission product removal from the tank waste. All of these chemical processes have contributed to a complex waste stream that varies from tank to tank that presents downstream processing challenges to render the waste into a safe form for long‐term storage. The current disposition pathway for Hanford tank waste is vitrification. To maximize waste loading and minimize the number of high‐level waste canisters stored in a geologic repository, pretreatment of the waste is required. Both pretreatment and vitrification operations are impacted by the waste composition.

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