High Rate Primary Treatment – Emerging Technologies

Leng, June; Strehler, Andy; Bucher, Bob; Gellner, Jamie; Kennedy, Kevin P.; Neethling, JB

doi:10.2175/193864702784247431

Cited by 2 publications

(1 citation statement)

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“…Ballasted sedimentation was originally proposed at the predesign phase of the project for this enhanced primary treatment following promising results from pilot testing at the County's West Point Plant (Leng, 2002). Figure 1 depicts results of that testing, showing TSS removals of over 80 percent with ballasted sedimentation at SORs above 40,000 gpd/ft 2 .…”

Section: Identifying the Issuementioning

confidence: 99%

High Rate Chemically Enhanced Primary Treatment as a Tool for Wet Weather Plant Optimization and Re-Rating

Krugel¹,

Melcer²

2005

proc water environ fed

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King County, Washington is currently designing their new 38 million-gallon-per-day (mgd) Brightwater Wastewater Treatment Plant to include membrane bioreactors (MBR) for secondary treatment, combined with enhanced primary treatment for peak flow management. Enhanced primary treatment was of interest as a method of reducing MBR size for Brightwater. The County initially selected ballasted sedimentation for the peak flow primary treatment role. Chemically enhanced primary treatment (CEPT) using conventional primary clarifiers was not initially considered a viable alternative due to low surface overflow rates assumed necessary for adequate performance. A review of reported results from CEPT operation at several plants on the west coast and King County's own past pilot efforts yielded little useful data at high SORs. However, substantial capital cost savings would be realized if CEPT proved successful at SORS of 3,500 to 5,000 gallons per day per square foot (gpd/ft 2 and gpd/sf). In a separate investigation, the County was interested in the potential of CEPT to contribute to additional capacity at their East Section Reclamation Plant (South Plant). Recognizing the limited data for CEPT at high overflow rates, the County undertook further full scale pilot testing to understand both potential performance at high overflows and test new chemical blends that had been reported to significantly improve CEPT performance. Full scale testing conducted at the South Plant over the winter of 2004/2005 demonstrated BOD removals above 40 percent at surface overflow rates (SORs) of 5,000 gallons per day per square foot and above 60 percent at SORs of 3,600 gpd/ft 2 . Based on this outstanding performance at high surface overflow rates, the County found that CEPT was cost effective for its Brightwater Plant and selected it in lieu of ballasted flocculation. The County is currently considering the potential to re-rate South Plant to recognize significant capacity through use of CEPT for peak flow treatment.CEPT, with use of modern chemical mixtures and proper chemical dosing protocols, makes sense for intermittent usage during high flow events for a number of potential applications. Plant re-rating using the technology could avoid the construction of new treatment units in many instances.

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Section: Identifying the Issuementioning

confidence: 99%

High Rate Chemically Enhanced Primary Treatment as a Tool for Wet Weather Plant Optimization and Re-Rating

Krugel¹,

Melcer²

2005

proc water environ fed

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Treatment of Combined Sewer Overflows Using Ferrate (VI)

Gandhi

Ray²,

Sharma³

et al. 2014

Water Environment Research

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Prevention of pollution from combined sewer overflows (CSOs) is currently a major concern due to their impact on aquatic and human environment. With the stringent regulations related to the CSOs treatment, it is necessary to develop an efficient, fast and low cost treatment technique that meets the applicable criteria. In this work, the comprehensive study was done to determine the efficiency of ferrate (VI) for the treatment of CSOs. At a Fe (VI) dose of 0.24 mg/l, TCOD, SCOD, TBOD 5 , SBOD 5 , TSS, VSS, TP, TN and soluble TN removal efficiencies of 71%, 75%, 69%, 68%, 72%, 83%, 64%, 38% and 36% respectively were achieved. Kinetic studies revealed that a contact time of only 15 minutes is sufficient to achieve secondary effluent criteria. An innovative technique of using primary sludge (PS) and thickened waste activated sludge (TWAS) as a source for the in-situ synthesis of ferrate was explored. A comparative study of treatment efficiencies achieved by Fe (VI) generated from different sources was done. At 0.1 mg/l dose of Fe (VI) synthesized from PS, TCOD, SCOD, TSS, VSS, TP and TN removal efficiencies of 60%, 62%, 63%, 67%, 30% and 25% respectively were achieved.

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High Rate Primary Treatment – Emerging Technologies

Cited by 2 publications

References 0 publications

High Rate Chemically Enhanced Primary Treatment as a Tool for Wet Weather Plant Optimization and Re-Rating

High Rate Chemically Enhanced Primary Treatment as a Tool for Wet Weather Plant Optimization and Re-Rating

Treatment of Combined Sewer Overflows Using Ferrate (VI)

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