Showing posts with label Soil. Show all posts
Showing posts with label Soil. Show all posts

Friday, March 3, 2023

Mead Nebraska Ongoing Environmental Disaster

Host: Cathy Wyatt Guests: #1 Eleanor Rogan, Ph.D. | College of Public Health, UNMC #2 Judy Wu-Smart, Ph.D. | Department of Entomology, UN-L #3 Janece Mollhoff | Resident, Ashland, NE An idea that normally could provide environmental benefits backfires. Since 2015, the ethanol plant was using treated corn, coated with fungicides and insecticides, including harmful bee-killing neonics, to produce its biofuel. The state finally filed a lawsuit in 2021 and ordered the plant shut down. Learn what has happened since then, how concerned those living in and around the area should be, and where we go from here.
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Saturday, February 25, 2023

Microbe Bacteria DIOXIN Remediation

 Ohio Trainwreck Bioremediation Soil Treatment Research

JOINT STUDY OF BIOREMEDIATION AT PILOT SCALE FOR DETOXIFICATION OF HERBICIDE/DIOXIN IN DA NANG HOT SPOT, VIETNAM

Dang TCH1, Allen H2, Nguyen BH1, Fong V2, Dam TH1, Nguyen NQ1, Nguyen QH1, Phung KHC3, Dao TNA1 

Institute of Biotechnology, Vietnam Academy of Science and Technology (VAST);  
US Environment Protection Agency (EPA); Military Institute of Chemical and Environmental Research, MOD Vietnam

Introduction

Biodegradation of tetrachloro dibenzo-p-dioxin (TCDD) has been reported in the scientific literature, in the laboratory, and in pilot studies. From 1999 to 2009, Vietnamese researchers conducted several studies to detoxify heavily contaminated soil in the former Da Nang military base1
. 
Full-scale bioremediation of 3,384 m3 of dioxin contaminated soil was demonstrated in Bien Hoa, Vietnam, in 2009. Several international scientific work groups have concluded that bioremediation is the most environmentally responsible and cost-effective remedy for cleaning up Agent Orange residues at the former air bases in Vietnam.

More than 30 years after the US-Vietnam War, spilled Agent Orange defoliant solution containing traces of the dioxins, TCDD and octachloro dibenzo-p-dioxin (OCDD), 2,4,5-T, 2,4-D, and chlorophenols (TCP and DCP) remains in the soil and in lake sediment affected by contaminated soil, which had been carried by runoff from the former military airbase in Da Nang2 . Natural attenuation of the herbicides and dioxins has not been effective in detoxifying the soil or sediment. 

This first joint study by Vietnamese and American researchers was conducted to
demonstrate whether the soil in Da Nang can be bioremediated effectively using aerobic or anaerobic microbial processes. This study also sought to provide engineering design guidance to support the selection of either an aerobic or an anaerobic amendment recipe and an operating strategy to optimize biological treatment. 

Conclusions Aerobic bioremediation is capable of significantly reducing TCDD toxicity (p=0.0026). Bioaugmentation with small amounts of treated soil or contaminated sediment may be effective for anaerobic treatment. However, if suitable growth conditions are provided, the indigenous microbes in the mixed soil and sediment at Da Nang appear capable of degrading TCDD without adding another source of microbes. Anaerobic bioremediation rate is about half the rate of aerobic treatment, but the results are not as significant (p=0.25). From our of point active landfill containing both aerobic and anaerobic degradation become feasible resolution for detoxification of heavy herbicide/dioxin in full scale in Vietnam. 

Bioremediation is recognized as a “Green Technology,” which has a very low energy requirement and produces few emissions. Bioremediation is a permanent solution which produces a soil which can be returned to beneficial use. Knowledge gained from this project by both Vietnamese and US scientists will allow for design of customized recipes suitable for addressing dioxin and other persistent organic pollution problems throughout Vietnam and elsewhere 



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Saturday, September 26, 2020

Kenaf Hibiscus Cannabinus L for Phytoremediation -Science Studies-

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