Polymer-Enhanced Subsurface Delivery and Distribution of Permanganate
Abstract
The Department of Defense (DoD) ESTCP-funded the demonstration and validation of polymeramended in situ chemical oxidation (ISCO) (PA-ISCO). PA-ISCO is the use of water-soluble polymers to enhance ISCO using permanganate. The demonstration was conducted at the Marine Corps Installations East Marine Corps Base Camp Lejeune s (MCIEAST-MCB CAMLEJ) Site 88, at which chlorinated solvents (trichloroethylene [TCE] and tetrachloroethylene [PCE]) are found in the subsurface. The two main goals of the project were: (1) to reduce the effects of site heterogeneities on oxidant delivery; and (2) manage the deposition of manganese dioxide (MnO2) (permanganate oxidation byproduct) to improve the delivery of oxidant. With respect to these objectives, experiments were carried out using two polymers. Xanthan gum was used to improve sweep efficiency of the oxidant through lower permeability areas. Sodium hexametaphosphate (SHMP) was used to reduce the instance of MnO2 precipitation and buildup. Through previous laboratory development funded by the DoD s Strategic Environmental Research and Development Program (SERDP), the effectiveness of both polymers was tested. Both were deemed viable candidates for field study. The test site consisted of two injection wells. One injection well received only permanganate (control plot); the other injection well received a mixture of oxidant and polymers (test plot). Multilevel wells were used to monitor groundwater prior to treatment, during treatment, and post-treatment. Real-time groundwater quality measurements included specific conductivity, oxidation-reduction potential (ORP), permanganate, and viscosity. Groundwater samples were collected from the multilevel monitoring wells for laboratory measurements of pH, ORP, solids concentration, cations, anions, cation exchange capacity (CEC), and anion exchange capacity toward understanding how polymer addition affects groundwater quality.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2013
- Accession Number
- ADA600293
Entities
People
- Andrea Leeson
- Charity Rychak
- Jeffrey A. Silva
- John E McCray
- Michelle Crimi
- Monica Fulkerson
- Nancy Ruiz
- Narendra De
- Saebom Ko
- Tom Palaia
Organizations
- Environmental Security Technology Certification Program