Temporal and spatial distribution of hypoxic/seasonal anoxic zone
in Amvrakikos Gulf, Western Greece.
Since the air-diffuser position resulted in the formation of aerobic or anoxic zone
, the performance of nitrogen removal through SND might be compared to the separated reactions of nitrification and denitrification.
They identified big differences between infected tissue and tissue in the preliminary stage of the disease: "In diseased coral tissue two zones develop: A phototrophic zone at the top in which the cyanobacteria produce oxygen and a lower anoxic zone
in which the bacteria degrade the necrotic coral tissue.
The oxygen is only found in the top layer, the oxic zone while the hydrogen sulfide is concentrated mostly in the bottom layer, the anoxic zone
. The hydrogen sulfide and oxygen are kept separate through a series of redox reactions.
Even though there is no nitrate limit for this system, an anoxic zone
was incorporated in the process in order to recover some of the alkalinity consumed by nitrification.
The microorganisms that live in some sediments off the coast of Louisiana provide a good record of the anoxic zone
created by the Mississippi River, says Osterman.
An anoxic zone
would precede the aerobic MBR to provide denitrification required by the TMDLs.
The first two-thirds of the anoxic zone
at the head of pass No.
The Vladix system combines multiple-stage settling chambers with an aeration basin providing high solids removal efficiency; the second stage of settling can be used as an anoxic zone
Denitrification occurs in an anoxic zone
of zero dissolved oxygen ahead of the aerobic zone.