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What happens if you run a filter for ~ 35 years without regular check-ups? Even when filters consistently meet effluent water quality standards, there can be performance issues lurking beneath the surface. The City of Ottawa’s Britannia and Lemieux Island Water Purification Plants operate 18 dual-media anthracite/sand biofilters for treating water from the Ottawa River. Traditionally, filter backwashing is the primary operational parameter for maintaining the proper function of filters. Filters were backwashed with velocities ranging from 43 to 47 m/h; in addition, backwash techniques varied between surface sweep agitators and air scouring methods. Floc retention analysis revealed that one filter struggled to meet the < 60 NTU clean media standard post backwash. Further examination of the filter media showed significant size degradation. Findings provide insights into key operational and design parameters, aiding in the identification of filter recovery strategies and proactive maintenance measures. This full-scale research emphasizes the use of floc retention data for evaluating filtration system health and aims to optimize biofilter performance.

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Does Your Backwash Matter? Influences on Filter Media Health

  • 会议论文

  • 发表日期：

    2025年

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  • Zoé Jeaurond,
  • Andy Campbell,
  • Joshua Elliott,
  • Jed Rode,
  • Onita D. Basu

摘要

What happens if you run a filter for ~ 35 years without regular check-ups? Even when filters consistently meet effluent water quality standards, there can be performance issues lurking beneath the surface. The City of Ottawa’s Britannia and Lemieux Island Water Purification Plants operate 18 dual-media anthracite/sand biofilters for treating water from the Ottawa River. Traditionally, filter backwashing is the primary operational parameter for maintaining the proper function of filters. Filters were backwashed with velocities ranging from 43 to 47 m/h; in addition, backwash techniques varied between surface sweep agitators and air scouring methods. Floc retention analysis revealed that one filter struggled to meet the < 60 NTU clean media standard post backwash. Further examination of the filter media showed significant size degradation. Findings provide insights into key operational and design parameters, aiding in the identification of filter recovery strategies and proactive maintenance measures. This full-scale research emphasizes the use of floc retention data for evaluating filtration system health and aims to optimize biofilter performance.