Evaluation of the effect of recycle of waste filter backwash water on plant removals of Cryptosporidium

Edzwald, James K.; Tobiason, John E.; Udden, Christina T.; Kaminski, Gary S.; Dunn, Howard J.; Galant, Peter B.; Kelley, Michael B.

doi:10.2166/aqua.2003.0024

Cited by 13 publications

(5 citation statements)

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“…In another phase of this project, the effects of variations in recycle loading and chemistry on treatment performance were evaluated at the pilot scale (Tobiason et al, 2003). The lack of impact of very significant increases in plant influent solids levels on clarified and filtered water quality in the full‐scale study was consistent with the findings of the pilot‐scale work for this project (Edzwald et al, 2003; Tobiason et al, 2003; Edzwald et al, 2001), as well as those of other pilot‐scale studies (Cornwell & MacPhee, 2001; Marinelli et al, 2001).…”

Section: Summary Of Fbw Recycle Quality and Effectssupporting

confidence: 86%

“…Because filter backwash is typically only a small fraction (i.e., 2–5%) of filtered water volume, pathogens removed during filtration are concentrated in the FBW. However, the actual levels of cysts or oocysts in waste FBW depend on clarification performance prior to recycle and recycle practice, as can be examined through mass balance analyses of process streams (Edzwald et al, 2003; Bellamy et al, 1998; Cornwell & Lee, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Full‐Scale Assessment of waste filter backwash recycle

Tobiason¹,

Edzwald²,

Levesque³

et al. 2003

Journal AWWA

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This article provides the results of studies of full-scale waste filter backwash water (FBW) recycle practices and water quality effects at six water treatment plants as well as recommendations for evaluating FBW recycle practices. Water quality parameters assessed included suspended solids, turbidity, particle counts, total and dissolved organic carbon, aluminum, and manganese. Results showed insignificant effects on plant influent water quality for recycle of clarified FBW and for a plant with continuous recycle. The FBW recycle quality was highly temporally variable for plants with only flow equalization (no solids removal), exhibiting significant peaks in solids levels that caused significant short-term increases in plant influent turbidity. However, the performance of downstream clarification (dissolved-air flotation or plate sedimentation) and filtration were not affected by FBW recycle for these plants. Evaluation of recycle effects requires knowledge of the site-specific details of plant operation (generation of recycle streams, flow control) and the chemistry of process waters (raw, recycle, and coagulated). FIGURE 2S St ta am mf fo or rd d W Wa at te er r T Tr re ea at tm me en nt t P Pl la an nt t s sc ch he em ma at ti ic c

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Section: Summary Of Fbw Recycle Quality and Effectssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Full‐Scale Assessment of waste filter backwash recycle

Tobiason¹,

Edzwald²,

Levesque³

et al. 2003

Journal AWWA

Self Cite

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“…The authors invented these sequencing batch processes (229), hoping that there will be more further improvements and more construction of full scale plants to be done by the young generations in the future. Edzwald and his coworkers (241)(242)(243)(244)(245)(246)(247)(248)(249)(250)(251)(252)(253), and more volunteers.…”

Section: Sequencing Batch Flotation Systems and Sequencing Sedimentatmentioning

confidence: 99%

Humanitarian Engineering Education of the Lenox Institute of Water Technology and Its New Potable Water Flotation Processes

Wang¹

2021

Environmental Flotation Engineering

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“…While significant information is available on the performance of granular media filters for removing Giardia and Cryptosporidium (oo)cysts in drinking water plants (Edzwald et al, 2003; Huck et al, 2002), there is relatively little published information on the impact of filter technology, media, design, and operation on the removal of TOrC or Cryptosporidium and Giardia (oo)cysts at wastewater treatment facilities. However, there are generally consistent results that media filtration provides improved pathogen removal versus cloth filters (Rose et al, 2004; Vaughn et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Improved operational reliability and contaminant removal in water reuse through filter upgrades

et al. 2021

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A redesign, construction, and replacement of the filters used for water reuse at a 11 million gallon per day Florida municipal water reclamation facility provided a prime opportunity to evaluate the impact of the filtration technologies on water quality, trace organic contaminant (TOrC) removal, and removal of pathogens. This study was designed to capture operational data, pathogen removal (Cryptosporidium and Giardia), and TOrC removal before the replacement of the filters using the existing synthetic media filters (SMF) and traveling bridge filters (TBF) followed by an evaluation of the deep bed filters (DBF) after construction and commissioning. The new DBF units provided substantially improved control of turbidity and total suspended solids while also significantly improving the removal of Giardia cysts (increase of >2 log removal) as compared to removal across the older SMF and TBF units and minor improvements to Cryptosporidium oocyst removal. TOrC removal was not significantly changed when comparing removal across the SMF, TBF, and DBF units nor post chlorination (chloramination).

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Evaluation of the effect of recycle of waste filter backwash water on plant removals of Cryptosporidium

Cited by 13 publications

References 0 publications

Full‐Scale Assessment of waste filter backwash recycle

Full‐Scale Assessment of waste filter backwash recycle

Humanitarian Engineering Education of the Lenox Institute of Water Technology and Its New Potable Water Flotation Processes

Improved operational reliability and contaminant removal in water reuse through filter upgrades

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