Filter Rehabilitation & Cleaning

  • Remove Old Materials
  • Hand-Place Largest Support Gravel
  • Leveled Small Gravel
  • Induction Equipment For Media Installation
  • Silica Sand Installed
  • End of a Typical Backwash
  • Remove Sand Fines After Draining
  • Carefully Install Anthracite to Control Dust
  • Anthracite Installed

USG FILTER REHABILITATION

Utility Service Group (USG) utilizes proven and AWWA-approved methods to replace all types of granular filtration media along with support gravel or high-density sand that are part of your filter design.  Our goal is to restore your system to its design specifications and improve your return on large capital investments while lowering your related annual O&M costs from excessive backwashing, chemical dosing, or lost production.  Proper and timely maintenance of important water system infrastructure should be part of every water utility’s comprehensive preventative maintenance program.  Our highly qualified personnel can efficiently and professionally remove and dispose of your current filter materials, perform detailed structural and mechanical inspections, and install new media and gravel in the proper manner to ensure successful disinfection and return to service.

REPLACING GRANULAR FILTER MEDIA AND SUPPORT GRAVEL

During typical granular filtration processes, inorganic particulates accumulate due to chemical reactions and specific microscopic bacteria (e.g. iron-oxidizing, manganese-oxidizing, sulfate-reducing). These inorganic deposits can include calcium, magnesium, iron, manganese, silica, copper, aluminum, sulfate and phosphate. These deposits lead to water quality problems and operational problems such as bed volume expansion, water and air flow restrictions, non-uniform surface features, and non-compliant effluent turbidity. In addition, organic buildup (“biofilm”) can lead to similar water quality and operational problems and can increase disinfection requirements.

If upon laboratory evaluation, the buildup of inorganic deposits and biofilm in your filter is too severe for chemical cleaning to be cost-effective, or if the existing media is simply too worn or degraded, then USG will select and install NSF-certified materials to match your current system specifications – whether it be silica sand, torpedo sand, anthracite or greensand, and whether it be single or multi-media. Our trained and conscientious staff will ensure the protection of the underdrain system and any ancillary equipment such as air scour or surface washers. Furthermore, if any damage is identified during the filter inspection (after old materials removed), we can make repairs or replace equipment/components as needed.

VALUE OF USG FILTER REPLACEMENT
  • Increase System Capacity:  Replacement restores filtration efficiency and performance to at or near the system’s original design specifications.
  • O&M Cost Savings: Once fouled media is replaced, backwashing should reduce down to and near its original design rate and frequency, resulting in less energy use and waste of potable water.  Also when media is fouled, chemical dosing is often increased in lieu of full rehabilitation; therefore clean media provides an opportunity to reduce chemical usage to minimal levels.
  • Minimize Media Loss:  Deposits cause media volume to “grow” thereby causing problematic bed volume expansion.  New filter media will have proper depths resulting in proper trough freeboard so that media loss, or carryover, is greatly reduced when backwash rate is appropriate.
  • Maximize Efficiency:  New filter media leads to proper bed porosity for your filter system design, improved filtration ability due to clean and structurally sound media particles, less cohesion of particles (e.g. due to calcium carbonates), and less detrimental effects from organic biofilm and inorganic deposits.
  • Better Regulatory Compliance: Post-cleaning IFE and CFE turbidities are improved, after sufficient backwashing and bed volumes are sent “to waste”.
  • Bottom Line:  If chemical cleaning is scientifically shown ineffective due to excessive fouling or if filter media is too degraded, then full replacement of media and gravel is the best maintenance solution for cost-effective operations and optimum system performance.

APPLICATIONS

  • Gravity Filters
  • Pressure Filters
  • “Specialty” Filters with proprietary media types or system designs

    All Filter System Components:
      • Underdrains
      • Air Scouring Equipment
      • Surface Washing Equipment
      • Troughs

 

USG FILTER CLEANING

Utility Service Group (USG) utilizes proven, patented and NSF-certified technologies for chemically cleaning the interiors of water storage tanks and granular filtration systems with the goal of restoring to like-new conditions and improving your return on large capital investments while lowering your related annual O&M costs.  Regular chemical cleaning of important water system infrastructure should be part of every water utility’s comprehensive preventative maintenance program.  Our highly qualified personnel can scientifically quantify the specific causes of inorganic and organic deposits and recommend a targeted solution for remediating your critical problems, while providing trained field staff to deliver each specific cleaning solution.

CHEMICAL CLEANING OF GRANULAR FILTER MEDIA

During typical granular filtration processes, inorganic particulates accumulate due to chemical reactions and specific microscopic bacteria (e.g. iron-oxidizing, manganese-oxidizing, sulfate-reducing).  These inorganic deposits can include calcium, magnesium, iron, manganese, silica, copper, aluminum, sulfate and phosphate.  These deposits lead to water quality problems and operational problems such as bed volume expansion, water and air flow restrictions, non-uniform surface features, and non-compliant effluent turbidity.  In addition, organic buildup (“biofilm”) can lead to similar water quality and operational problems and can increase disinfection requirements.

The presence of inorganic deposits and biofilm do not necessarily require media replacement if the media is structurally sound and can be restored to like-new conditions.  Utility Service will scientifically evaluate samples of your granular media – whether it be silica sand, torpedo sand, anthracite or greensand, and whether it be single or multi-media – to determine the efficacy of chemical cleaning and propose a customized approach to chemically clean the media in your gravity or pressure filters utilizing patented, NSF-approved products.  If however the existing media is shown to be at or very near the end of its useful life through our laboratory analyses, then Utility Service can assist the utility owner with complete replacement.

VALUE OF USG FILTER CLEANING

  • Increase System Capacity and Media Life:  Cleaning improves filtration efficiency and performance, reduces backwash frequency, and extends media life (if structurally sound).
  • Minimize Media Loss:  Deposits cause media volume to “grow” thereby causing problematic bed volume expansion.  Chemical cleaning can substantially reduce bed volume and lead to less media loss during backwash.
  • Maximize Efficiency:  Chemical cleaning leads to improved bed porosity as the media is restored as close as possible to design specifications, improved filtration ability due to significantly cleaner media particles, less cohesion of particles (e.g. due to calcium carbonates), and less detrimental effects from organic biofilm and inorganic deposits.
  • Better Regulatory Compliance: Post-cleaning IFE and CFE turbidities are improved, after sufficient backwashing and bed volumes are sent “to waste”.
  • Restoration:  The chemical cleaning process reconditions critical filtration components and extends the useful life of the system.  The figure below generally depicts the beneficial effect of regular cleaning.

 

 

  • Bottom Line:  For cost-effective operations and optimum system performance, get regular cleaning and conduct routine maintenance.

APPLICATIONS


Remove mineral deposits and biofilm that form on the surfaces of:

  • Filter Media
  • Walls of Gravity and Pressure Vessels/Basins
  • Underdrains
  • Troughs
  • Air Scouring Equipment (if applicable)

       

     

 

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Filter Rehabilitation & Cleaning Brochure
Filter Maintenance Program
We utilize proven, NSF-certified technologies for chemically cleaning the interiors of granular filtration systems. The goal of these cleaning filtration systems is restoring to “like new” conditions and improving your return on large capital investments — all while lowering your related long-term operation and maintenance costs. Download Brochure
Filter Maintenance Program

 

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