R. Mehmannavaz et al., Effect of bioaugmentation on microbial transport, water infiltration, moisture loss, and surface hardness in pristine and contaminated soils, J ENVIR S A, 36(2), 2001, pp. 123-139
Citations number
29
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Three different soils, a clay, a pristine sandy loam and a PCB-contaminated
sandy loam, were bioaugmented to determine the influence of clay content a
nd contaminants on the transport of bacteria in unsaturated soils, using su
rface irrigation water as a transport medium. The results indicate that the
transport of the implanted bacteria was influenced negatively more by the
presence of PCBs than by the clay content of the soil. Transport was direct
ly related to the frequency of irrigation and length of the intervals betwe
en irrigation periods, making these variables important factors to consider
when applying bioaugmentation via downward percolating water. Other parame
ters measured after bacterial bioaugmentation were water infiltration, mois
ture loss, and surface hardness of these soils. Surface water infiltration
was affected more by the soil clay content than by the hydrophobic contamin
ant. Infiltration was significantly but differently influenced by bioaugmen
tation, positively in clay, negatively in sandy loam, and negatively (to a
lesser extent) in the PCB-contaminated sandy loam soils. Moisture loss was
slower in the bioaugmented soil than in the control soils, with this differ
ence being most pronounced in the PCB soil. High moisture loss in the bioau
gmented clay soil rendered it the hardest soil for surface penetration.