Set Aside Treatability Guidelines
Download
1 / 18

Set Aside Treatability Guidelines - PowerPoint PPT Presentation


  • 79 Views
  • Uploaded on

Set Aside Treatability Guidelines. Brent Means U.S. Office of Surface Mining. Introduction. The SA program is ~ 14 years old. The AML reauthorization provides an opportunity and reason to perform a review of the SA program.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Set Aside Treatability Guidelines' - flynn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Set Aside Treatability Guidelines

Brent Means

U.S. Office of Surface Mining


Introduction

  • The SA program is ~ 14 years old

  • The AML reauthorization provides an opportunity and reason to perform a review of the SA program

  • The workgroup was formed to produce guidelines that would form the basis for future project selection

  • The guidelines contain both project selection and treatability criteria


Project Selection and Treatability Document: Guiding Principals

Achieving and maintaining restoration is most important

SA program should be expanded to consider any type of treatment (not just passive)

Restoration should be done in a “comprehensive” manner


Treatability Criteria Principals

  • The goal of the criteria is to ensure the proposed treatment or abatement strategy is an appropriate match for the water quality and site conditions

  • The treatability scoring is based on three evaluations:

  • A “Proven” evaluation: focused on evaluating whether the proposed scenario is proven to provide treatment

  • A “Reliability” evaluation: an operational evaluation

  • A “Predictable” evaluation: a maintenance evaluation

  • The proposed treatment project is evaluated against the criteria for each of the three assessments, resulting in an overall score for the Treatability section of the document


Proven Evaluation Principals

A “proven” technology is a treatment or abatement technique that:

  • is successfully used at numerous locations under treatment scenarios similar to the proposed project;

  • is sized or manufactured using a science-base approach that can be evaluated

  • has a data-supported performance record


Reliable Evaluation Principals

A “reliable” treatment or abatement technology is one that:

  • Can achieve the treatment/abatement goals > 90% of the design life;

  • Can be operated and maintained to consistently achieve treatment/abatement goals;

  • Can be manipulated to achieve treatment/abatement goals under varying flow, chemistry, and operational conditions;


Predictable Evaluation Principals

A “predictable” treatment or abatement technology is one that:

  • contains troubleshooting capacity;

  • can be maintained or rehabilitated if the treatment/abatement goals are not being achieved;

  • has maintenance flexibility built into the treatment scheme;


Set Aside projects are arranged into 6 Categories Principals

  • Active Treatment

  • Passive Treatment of Net Alkaline discharges

  • Passive Treatment of Net Acidic discharges using ALD

  • All other types of Passive Treatment for Net Acidic water

  • Innovative Technology

  • Abatement projects

  • All SA projects fit into one of these categories and evaluated against the “Proven”, “Reliable,” and ‘Predictable” scoring criteria


Example using Active Treatment Principals

Proven Evaluation:

  • is successfully used at numerous locations under treatment scenarios similar to the proposed project;

  • is sized or manufactured using a science-base approach that can be evaluated

  • has a data-supported performance record

** Can automatically receive a high proven score if it is commonly used to achieve water quality based standards in similar situations

  • Other factors that affect the “Proven” evaluation


Example using Active Treatment Principals

  • Other factors that affect “Reliability” evaluation:

  • Ability to achieve treatment goals under the range in hydrologic and geochemical conditions characterized at the site

  • Ability to continue treatment during desludging

  • Ease of operation

Reliable Evaluation (deals with operational issues) :

  • Evaluate the likelihood that the recommended system can achieve the treatment/abatement goals > 90% of the design life;

  • Evaluate whether the proposed system can be operated and maintained to consistently achieve treatment/abatement goals;

  • Evaluate whether the proposed system can be manipulated to achieve treatment/abatement goals under varying flow, chemistry, and operational conditions

  • Evaluate whether the proposed system be operated to achieve varying degrees of treatment


Example using Active Treatment Principals

Predictability Evaluation (deals with maintenance issues) :

  • Evaluate the whether the proposed system contains the capacity to easily troubleshoot operational problems;

  • Evaluate whether the proposed system can be easily maintained or rehabilitated if the treatment/abatement goals are not being achieved;

  • Evaluate whether the proposed system contains maintenance flexibility built into the treatment scheme;

  • Other factors that affect the “Predictability” evaluation

  • Time frame between chemical replenishment

  • Time frame between desludging events

  • Sludge handling

  • Longevity of sludge storage volume


Treatability Evaluation Principals

  • Active Treatment - covered

  • Passive Treatment of Net Alkaline Discharges

  • Promoted by automatically receiving a high “proven” score

  • Scoring is affected by sludge handling, sludge storage volume, addresses the effects of temp., etc.

  • Passive Treatment of Net Acidic Discharges using ALDs

  • Promoted by automatically receiving a high “proven” score

  • Ease of troubleshooting system, sludge handling, rehabilitation plan

  • All other types of passive treatment for Net Acidic discharges using passive Treatment


Treatability Evaluation Principals

  • All other types of passive treatment for Net Acidic discharges using passive Treatment

Proven Evaluation:

  • Discharge characteristics are compared against risk matrix to obtain a score

  • Risk Matrix was developed on the premise that passive treatment (e.g. VFP) best performs (longevity, maintenance) on low-loading discharges

  • The intent of the risk matrix is to provide a structured approach for project selection that would be continuously refined as projects are completed and performance is field-validated


All other Passive Treatment on Net Acidic water Principals

  • Other factors that affect “Reliability” evaluation:

  • Ability to control flow into the system

  • Ease of treatment operation

  • Ability to continue treatment during desludging or rehabilitation events

Reliability Evaluation:

  • Evaluate the likelihood that the recommended system can achieve the treatment/abatement goals > 90% of the design life;

  • Evaluate whether the proposed system can be operated and maintained to consistently achieve treatment/abatement goals;

  • Evaluate whether the proposed system can be manipulated to achieve treatment/abatement goals under varying flow, chemistry, and operational conditions

  • Evaluate whether the proposed system be operated to achieve varying degrees of treatment


All other Passive Treatment on Net Acidic Water Principals

  • Other factors that affect the “Predictability” evaluation

  • Ability to monitor the progression of plugging

  • Ease of troubleshooting treatment system

  • Time frame between rehabilitation events

  • A plan to dispose of compost or limestone

Predictability Evaluation (deals with maintenance issues) :

  • Evaluate the whether the proposed system contains the capacity to easily troubleshoot operational problems;

  • Evaluate whether the proposed system can be easily maintained or rehabilitated if the treatment/abatement goals are not being achieved;

  • Evaluate whether the proposed system contains maintenance flexibility built into the treatment scheme;


Treatability Evaluation Principals

  • Innovative Technology

  • AML money is not permitted for “research” activities

  • Innovative Technologies would be subject to a “proven, reliability (operation), and predictability (Maintenance)” evaluations

  • Abatement Projects

  • Abatement Projects would be subject to a “proven, reliability (operation), and predictability (Maintenance)” evaluations

  • The background data should be sufficient enough to show the cause/effect relationship between the mining feature and the affected water resource


THE END Principals


ad