HiSOC Hydrogen InFusion

HiSOC® is based on the robust design of iSOC® and possesses its low O&M and capital cost structure. HiSOC® is designed with specialized fittings to deliver Hydrogen gas for reductive dechlorination of chlorinated aliphatic hydrocarbons, denitrification of nitrate and reduction of perchlorate in groundwater.

HiSOC hidrogén infúzió

Overview

The re-designed flow controller will mass transfer H2 at a rate of 28 standard cubic centimeters per minute, without sparging. The HiSOCâ„¢ will deliver 3.6 grams of H2 per day (1 gram of H2 will degrade 20 grams of PCE to Ethene). The HiSOC unit fits in 2" diameter wells.

The inherent flexibility of the system and controlled delivery serves to prevent secondary water quality impacts associated with organic electron donors and eliminates the need to stimulate biomass that only serves to produce hydrogen by fermentation of organic electron donors.

Main Applications

H2 is a stron electron donor that is used for biostimulation in the following cases:

  • Reductive dechlorination of Chlorinated Aliphatic Hydrocarbons (CAHs); PCE, TCE, DCE, etc.
  • Nitrate denitrification
  • Dissimilatory reduction of Perchlorate in groundwater

Bioremediation of contaminants in groundwater is implemented at a site by the direct infusion of hydrogen as an electron donor with the HiSOC Gas inFusion delivery system. If not already present, anaerobic conditions are generated by the delivery of H2. H2 is delivered to satisfy hydrogen demand, calculated from estimates of competing electron acceptors and contaminant mass present in the treatment zone. Where appropriate this calculation includes the mass of electron acceptors in the dissolved and solid phase within the treatment area and the mass flux of electron acceptors into the treatment area with groundwater flow. The required mass of hydrogen can then be compared to rates of hydrogen delivery by the HiSOC to determine the appropriate number of treatment wells.

A detailed procedure for evaluation of hydrogen demand is included in "Principles and Practices of Enhanced Anaerobic Bioremediation of Chlorinated Solvents (AFCEE, 2004).