Biochemical oxygen

The amount of oxygen used in the degradation process is called the biochemical oxygen demand (BOD). A standard test has been devised to measure BOD in which the oxygen utilized by microorganisms in contact with the wastewater over a 5-day period at 20°C is measured. 

Several methods have been developed to estimate the oxygen demand in waste water treatment systems. Commonly used laboratory methods are biochemical oxygen demand (BOD), chemical oxygen demand (COD), total oxygen demand (TOD), total organic carbon (TOC), and theoretical oxygen demand (ThOD). 

Biochemical Oxygen Demand. The biochemical oxygen demand (BOD) test is an empirical determination of the oxygen requirement of a sample. It is most often appHed to wastewaters, industrial effluents, and poHuted waters. The decrease in the dissolved oxygen concentration resulting primarily from biological action is measured after storage for 5 d at 20°C. 

BCOD Biodegradable chemical oxygen demand NBOD Nitrogenous biochemical oxygen demand... 

BOD Biochemical oxygen demand NPDES National pollutant discharge elimination system... 

Petrochemical units generate waste waters from process operations such as vapor condensation, from cooling tower blowdown, and from stormwater runoff. Process waste waters are generated at a rate of about 15 cubic meters per hour (m /hr), based on 500,000 tpy ethylene production, and may contain biochemical oxygen demand (BOD) levels of 100 mg/1, as well as chemical oxygen demand (COD) of 1,500 to 6,000 mg/1, suspended solids of 100 to 400 mg/1, and oil and grease of 30 to 600 mg/1. Phenol levels of up to 200 mg/1 and benzene levels of up to 100 mg/1 may also be present. 

Nutrients can be classified into three groups based on levels required in waste treatment systems. These are given in Table 9. The major nutrients can be identified from the generalized biomass formula (Ceo Hg2 O23 Ni2 P). The actual quantity needed depends on the biochemical oxygen demand (BOD) of the waste. The higher the BOD the greater the quantity of cells produced. The minor and trace nutrients are needed in small quantities and are given in terms of concentration because these are the levels needed in solution to force the small amount required inside the cell across the cell-wall membrane. 

The objective disinfection biochemical oxygen demand (BOD) or chemical... 

Biochemical oxygen demand (BOD)- Amount of dissolved oxygen consumed in five days by biological processes breaking down organic matter. 

BOD Biochemical Oxygen Demand - the rate at which microorganisms use the oxygen in water or wastewater while stabilizing decomposable organic matter under aerobic conditions. In decomposition, organic matter serves as food for the bacteria and energy results from this oxidation. 

Biochemical oxygen demand (BOD) The molecular oxygen used in meeting the metabolic needs of aerobic organisms in aqueous medium containing an oxidizable organic molecule. 

The organization for Economic Co-operation and Development publishes a compendium on environmental data including river monitoring, also on a biannual basis. The most recent edition includes 5 year incremental data from 1970 through 1985 for chromium, copper, lead, cadmium, ammonia, nitrate, phosphorous, dissolved oxygen and biochemical oxygen demand 28),... 

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