biological oxygen demand


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Related to biological oxygen demand: Dissolved Oxygen

biological oxygen demand

biological oxygen demand

The amount of oxygen required for a biological reaction, esp. the oxygen required to oxidize materials in natural water supplies, e.g., rivers or lakes.
See: eutrophication
See also: demand

biological oxygen demand (BOD)

See BIOCHEMICAL OXYGEN DEMAND.
References in periodicals archive ?
The 'allowable discharge' for biological oxygen demand was 88.0 kg/t.
Reactor digestion method was used for the determination of chemical oxygen demand (COD) [9], while biological oxygen demand (BOD) was measured by standard BOD 5 method [13].
2007 TOMARO AJEGUNLE PARAMETERS (mg/L) A B A B Air temperature ([degrees]C) 28.20 28.00 27.00 27.30 pH 7.32 7.45 7.41 7.80 Total dissolved solids 1716.00 1760.00 647.00 648.00 Total suspended solids 32.00 33.00 92.00 94.00 Dissolved oxygen 4.20 4.20 4.80 4.10 Chemical oxygen demand 260.00 230.00 330.00 360.00 Biological oxygen demand 80.00 70.00 80.00 110.00 Acidity 1.80 1.60 2.00 2.00 Alkalinity 70.00 140.00 630.00 700.00 Conductivity ([micro]S/cm) 3270.00 3350.00 1262.00 1231.00 Sulphate 25.50 25.00 8.00 8.50 Calcium 27.80 11.10 83.40 27.80 Magnesium 170.60 145.70 57.60 85.00 Zinc 0.01 0.01 0.01 0.01 Iron 0.11 0.13 0.13 0.11 Copper 0.000 0.000 0.002 0.001 Chloride 725.00 638.00 101.50 98.60 Total hardness 764.50 625.50 417.00 278.00 NOV.
Analytical instrument vendors at the show exhibited a fairly narrow range of technologies, focused on molecular spectroscopy and, especially, electrochemical techniques including dissolved oxygen meters, biological oxygen demand and chemical oxygen demand analyzers, nutrient analyzers (nitrates, nitrites and ammonia), total organic carbon analyzers (TOC), pH and ion selective meters and electrodes, conductivity and resistivity meters, and assorted portable and fixed gas analyzers devoted to worker safety.
The facility is designed to handle an average monthly biological oxygen demand (BOD) of 5 mg/L and total suspended solids (TSS) of 10 mg/L, considerably better than the original requirement of 20 mg/L BOD and 20 mg/L TSS.
He suggested that dissolved air flotation (DAF) clarification technology can act as a "kidney" for the mill to reduce dissolved and colloidal solids, including metals, pitch, stickies, and the associated chemical oxygen demand and biological oxygen demand accumulations.
Says Hailu, "The industry, between 1959 and 1994, has been reducing its biological oxygen demand and total suspended solid outputs at average annual rates of 3.3 and 5.9 percent, respectively.
The purpose of these ponds is to reduce the ROD (biological oxygen demand) and adjust the pH.
"Therefore," says Blanchard, "the Biological Oxygen Demand (BOD) of sodium chloride is lessened, and so, too, is the threat on marine life."
In wastewater tests, the system reduced biological oxygen demand (measured after septic tank treatment) from 358 mg/1 to 1.2 mg/1 on average.
Another graphic illustration: "One kraft mill discharges oxygen demanding substances equal to a city with a population greater than 120,000 people." Traditional effluent descriptions in Canada have related to toxicity to fish; total suspended solids (TSS) -- concerned with the build up of wood fibers and residues in receiving water; and biological oxygen demand (BOD)-- the release of oxygen-depleting substances which can kill or seriously interfere with fish and other aquatic life forms.
Biological Oxygen Demand (BOD) levels are reducing which is an improvement, at 26 locations and coliform bacteria count is reducing which is an improvement, at 30 locations.

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