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Arsenic Treatment The rest of the story. Presented to:. Texas Commission on Environmental Quality October 25, 2005. Russell Fisher Turnstone Services The Woodlands, Texas (281) 419-0747. The Commercial Perspective. Locate prospects – anticipate the unmet need

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arsenic treatment the rest of the story

Arsenic TreatmentThe rest of the story

Presented to:

Texas Commission on Environmental Quality

October 25, 2005

Russell Fisher

Turnstone Services

The Woodlands, Texas

(281) 419-0747

slide2

The Commercial Perspective

  • Locate prospects – anticipate the unmet need
  • Qualify Prospects – gather data to understand need
  • Propose Solution - Satisfy customer’s need

Turnstone Services

slide3

The Need - Arsenic Treatment Objectives

Achieve compliance

Conserve the water resource

Define the Need – Gather Information

Aquifer characteristics

Water Quality Data - TCEQ

Usage information - PWS

Develop Arsenic Treatment Strategy

Associated regulatory issues

Technology Constraints

Unanticipated Consequences

Turnstone Services

slide4

Texas Groundwater is a Dynamic System

  • Sandstone Aquifers – highly variable over short dist
  • Intermittent Recharge – year to year rainfall variance
  • Regional climate variation – fluctuating water levels
  • Coastal faulting and subsidence
  • Geochemistry - the rock/water system

Turnstone Services

slide5

Understanding the Environment

Indicator Species

TDS - may require lowering of salt content

pH - activity of the hydrogen ion

Eh – electrode potential, activity of the electron

Ca/Mg – hardness, scale forming pH sensitive

Cl- – major contributor to TDS

HCO3- – contributes to TDS, limits F trmt

Turnstone Services

slide7

Common Redox Species In Ground Water

Oxidized Sand

Reduced Sand

Turnstone Services

slide8

Groundwater Redox Front

O2

H2O

Fe2O3

UO2+2

MoS2

HAsO4-

As2O3

H3AsO3

As2S3

MoO4-2

UO2

FeS2

Turnstone Services

slide9

Importance of redox potential

Redox state often dictates solubility

Fe(+III) insoluble, Fe(+II) low to moderate solubility

U(+IV) insoluble, U(+VI) highly soluble

Redox affects acid-base behavior, i.e. charge

H3AsO4 mild acid, H3AsO3 weak acid

HNO3 strong acid, HNO2 weak acid

Redox reactions affect pH

Ionization of weak acids: HCO3-1, H4SiO4

Turnstone Services

slide10

Typical Treatment Strategies

Rule #1: Match the Solution to the Problem

Turnstone Services

slide11

Summary

  • Understand geological setting – aquifer type, mineralogy
  • Analyze water sample for less known species
  • Interpret water analysis in context of aquifer geochemistry
  • Apply technologies that best address the problem

Turnstone Services

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