Science Inventory

Laboratory research on the efficacy of the TDA, Inc., photochemical mold remediation (PMR) technology for contaminated building materials.

Citation:

Betancourt, D., T. Dean, E. Beaudoin, B. France, AND W. Bell. Laboratory research on the efficacy of the TDA, Inc., photochemical mold remediation (PMR) technology for contaminated building materials. 2018 EPA International Decontamination Meeting, RTP,NC, May 08 - 10, 2018.

Impact/Purpose:

The goal of the U.S. Environmental Protection Agency (EPA) and TDA, Inc (TDA) Cooperative Research and Development Agreement (CRADA # 901-16) is to evaluate the efficacy of TDA, Inc - “Photochemical Mold Remediation” (TDA-PMR) technology for the remediation of building materials contaminated with molds. The TDA-PMR technology consists of an on-site photochemical generation of active chlorine dioxide (ClO2) species to deactivate biological organisms in biofilms. Previous EPA research of ClO2technologies for fumigation of viable mold contaminated building materials showed the potential of these technologies for remediation of extremely water-damaged buildings. Through this EPA-TDA CRADA, TDA plans to develop a specific formulation (F) of the photochemical system that is designed for use against fungi and fungal spores. The EPA laboratory evaluations consisted of testing the efficacy of the PMR technology on building materials that support mold growth.

Description:

The goal of the U.S. Environmental Protection Agency (EPA) and TDA, Inc (TDA) Cooperative Research and Development Agreement (CRADA # 901-16) is to evaluate the efficacy of TDA, Inc - “Photochemical Mold Remediation” (TDA-PMR) technology for the remediation of building materials contaminated with molds. The TDA-PMR technology consists of an on-site photochemical generation of active chlorine dioxide (ClO2) species to deactivate biological organisms in biofilms. Previous EPA research of ClO2technologies for fumigation of viable mold contaminated building materials showed the potential of these technologies for remediation of extremely water-damaged buildings. Through this EPA-TDA CRADA, TDA plans to develop a specific formulation (F) of the photochemical system that is designed for use against fungi and fungal spores. The EPA laboratory evaluations consisted of testing the efficacy of the PMR technology on building materials that support mold growth. Four mold species frequently isolated from water-damaged buildings were used: Alternaria alternata, Aspergillus versicolor, Chaetomium globosum, and Stachybotrys chartarum. These contaminants were individually inoculated onto the surface of six building materials: gypsum wallboard (W), latex-painted gypsum wallboard (L), bare-structural pine wood (PW), concrete (CN), ceiling tile (C) and glass (G). The inoculated building materials were fumigated with the TDA-PMR formulations F1; F2; F3 and F4. Each formulation was tested individually. The reduction in viable spores was determined by subtracting the average log values of colony forming units (CFU) recovered from the treated coupons from the CFU recovered from the positive controls. The target reduction, determined by EPA for previous remediation studies was a 4 log reduction (99.99% inactivation efficiency). Formulations F3 and F4 were the most effective for fumigation of mold-contaminated building materials using an exposure time of 4 hours under a Repti-Sun light @ 9,000 – 10,000 lux. F3 and F4 fumigations showed a ≥ 4-log reduction in CFU for A.versicolor, and S.chartarum on W, CN and PW. Likewise, a ≥ 4-log reduction in CFU for A. alternata was observed on W. A < 4-log reduction in CFU for A versicolor, S.chartarum, A.alternata and C.globosum was observed on L and C. Likewise a < 4-log reduction in CFU for C.globosum was observed on CN.

URLs/Downloads:

LABORATORY RESEARCH ON THE EFFICACY OF THE TDA, INC. PHOTOCHEMICAL MOLD REMEDIATION FINAL 508.PDF   (PDF,NA pp, 822 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/POSTER)
Product Published Date: 05/10/2018
Record Last Revised: 07/31/2018
OMB Category: Other
Record ID: 341695

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

AIR AND ENERGY MANAGEMENT DIVISION

DISTRIBUTED SOURCE AND BUILDINGS BRANCH