BioPod systems utilize an advanced design for filtration, sorption and biological uptake
to remove total suspended solids, dissolved metals, nutrients, gross solids, trash and debris as well as petroleum hydrocarbons from stormwater runoff.
Nitrate, phosphate, and silicate concentrations all increased from their lowest values in fall to overall highest values in late spring, after which each nutrient showed evidence of biological uptake. A deep pycnocline, between 50 and 80 m, persisted from November to February, isolating a bottom-water layer that showed evidence of microbially mediated silicate regeneration (silicate concentrations increased, phosphate decreased, and nitrate concentrations were variable).
The depth-averaged nitrate concentration was about 11.2 [mu]M on 19 March and dropped to about 7.2 [mu]M on 1 May, which would correspond to an apparent biological uptake of approximately 4 [mu]M.
Biological uptake and oxidation/reduction cycles may also affect the P transport characteristics of ditches.
The accumulation of agricultural nutrients in ditch channels is driven by sedimentation, sorption, and biological uptake. These processes moderate the impact of edge-of-field nutrient losses on receiving water bodies.
They were derived from studies that showed the potential for aerial transport, the relationship between the contaminants' concentrations in soils and their biological uptake
. Subsequently, the protocol was modified to include total petroleum hydrocarbons in the DLCU program.
"On average," says Barlaz, "the compost cover stimulated the biological uptake
[and breakdown] of at least 2.5 times as much methane as the clay cover." The compost sandwich removed 55 percent of the methane, while the clay removed 21 percent.
The duration and magnitude of phytoplankton primary productivity impacts carbon fixation, carbon export, and air-sea carbon flux, so this work results in more accurate estimates of the oceanic net carbon biological uptake
It was also discovered that biological uptake
of hydrogen sulfide gas by the acid-producing Thiobacillus thiooxidans bacteria was the primary removal mechanism in the sewer headspace.
In other agricultural catchments, N[H.sub.4]-N uptake did not appear to have exceeded the biological uptake
capacity of the streams (Bernot et al.
1) it provides no information concerning the types of processes or mechanisms in operation during biological uptake
, or information regarding the chemical or physical speciation of the radionuclide;