Sediments They are the materials that settle on the bottom of a waterway that has
been transported from the surrounding area over time as a result of weathering
and erosion.
Selector hydraulic retention time (HRT) The given time it takes wastewater,
including any return flows, to pass through a tank (selector).
Selector A zone in a biological treatment process with specific environmental
conditions that allow for the growth or lack of growth of certain microorganisms
(such as an anoxic or anaerobic zone).
Seminar Session designed to orient participants to new or updated plans, policies,
or procedures through informal discussion.
Sensitivity The degree to which a system is affected, either adversely or beneficially, by climate variability or change. The effect may be direct (e.g., a change in
crop yield in response to a change in the mean, range, or variability of temperature) or indirect (e.g., damages caused by an increase in the frequency of coastal
flooding due to sea level rise).
Septic A condition produced by anaerobic bacteria. If severe, the wastewater produces hydrogen sulfide, turns black, gives off foul odors, contains little or no
dissolved oxygen, and creates a high oxygen demand.
Sequencing batch exchanger (SBE) A sequencing batch process involving the use
of separate batch process steps in sequence of filling water/wastewater, reacting
with ion exchanger, settling insoluble spent ion exchanger, discharging treated
effluent, and recycling the settled spent ion exchanger for regeneration, resulting
in removing ionic pollutants from water or wastewater. (US Patent 5,354,458).
Sequencing batch flotation (SBF) A sequencing batch process (either biological
or physicochemical) involving the use of separate batch process steps in sequence
of filling water/wastewater, reacting with chemicals or biomass, floating light
weight-insoluble flocs and/or biomass, discharging treated effluent, and wasting
floated insoluble scums, for water or wastewater treatment is also called sequencing batch flotation (SBF) process. (US Patent 5,354,458).
Sequencing batch reactor (SBR), biological A biological SBR system performs
all the necessary functions of carbonaceous and nutrient removals in a single tank
with variable water levels and timed aerobic aeration or anoxic mixing. This SBR
system requires a minimum of three tanks and advanced automation equipment to
control the cycle times and phases. The SBR control systems allow the operation
to be configured to operate as almost any other suspended growth biological
reactor by adjusting the cycle phases between fill phase, react phase (either
aerobic aeration or anoxic mixing), separation phase (either sedimentation or
flotation), and decant phase. The biological SBR system involving the use of
flotation in the separation phase is invented by Dr. Lawrence K. Wang,,
Dr. Lubomyr Kurylko, and Dr. Mu-Hao Sung Wang in 1994 (US Patent
5,354,458).
Sequencing batch reactor (SBR), physicochemical A physicochemical SBR system performs all the necessary functions of organic and inorganic pollutants
removals in a single tank with variable water levels and timed mixing,
12 Glossary of Natural Resources and Environmental Pollution Control
481
been transported from the surrounding area over time as a result of weathering
and erosion.
Selector hydraulic retention time (HRT) The given time it takes wastewater,
including any return flows, to pass through a tank (selector).
Selector A zone in a biological treatment process with specific environmental
conditions that allow for the growth or lack of growth of certain microorganisms
(such as an anoxic or anaerobic zone).
Seminar Session designed to orient participants to new or updated plans, policies,
or procedures through informal discussion.
Sensitivity The degree to which a system is affected, either adversely or beneficially, by climate variability or change. The effect may be direct (e.g., a change in
crop yield in response to a change in the mean, range, or variability of temperature) or indirect (e.g., damages caused by an increase in the frequency of coastal
flooding due to sea level rise).
Septic A condition produced by anaerobic bacteria. If severe, the wastewater produces hydrogen sulfide, turns black, gives off foul odors, contains little or no
dissolved oxygen, and creates a high oxygen demand.
Sequencing batch exchanger (SBE) A sequencing batch process involving the use
of separate batch process steps in sequence of filling water/wastewater, reacting
with ion exchanger, settling insoluble spent ion exchanger, discharging treated
effluent, and recycling the settled spent ion exchanger for regeneration, resulting
in removing ionic pollutants from water or wastewater. (US Patent 5,354,458).
Sequencing batch flotation (SBF) A sequencing batch process (either biological
or physicochemical) involving the use of separate batch process steps in sequence
of filling water/wastewater, reacting with chemicals or biomass, floating light
weight-insoluble flocs and/or biomass, discharging treated effluent, and wasting
floated insoluble scums, for water or wastewater treatment is also called sequencing batch flotation (SBF) process. (US Patent 5,354,458).
Sequencing batch reactor (SBR), biological A biological SBR system performs
all the necessary functions of carbonaceous and nutrient removals in a single tank
with variable water levels and timed aerobic aeration or anoxic mixing. This SBR
system requires a minimum of three tanks and advanced automation equipment to
control the cycle times and phases. The SBR control systems allow the operation
to be configured to operate as almost any other suspended growth biological
reactor by adjusting the cycle phases between fill phase, react phase (either
aerobic aeration or anoxic mixing), separation phase (either sedimentation or
flotation), and decant phase. The biological SBR system involving the use of
flotation in the separation phase is invented by Dr. Lawrence K. Wang,,
Dr. Lubomyr Kurylko, and Dr. Mu-Hao Sung Wang in 1994 (US Patent
5,354,458).
Sequencing batch reactor (SBR), physicochemical A physicochemical SBR system performs all the necessary functions of organic and inorganic pollutants
removals in a single tank with variable water levels and timed mixing,
12 Glossary of Natural Resources and Environmental Pollution Control
481