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Secondary treatment of wastewater

W. F. Nolte, "Effects of Elevated Pressure on Secondary Treatment of Wastewater," myidvances in Environmental S cience and Engineerings Vol. 4, Gordon and Breach Science PubHshers, New York, 1981, pp. 161—169. [Pg.290]

A schematic for secondary treatment of wastewater from a municipal sewer system. [Pg.570]

Trickling filters. A device for the biological or secondary treatment of wastewater, consisting of a bed of rocks or stones that support bacterial growth. Sewage is trickled over the bed, enabling the bacteria to break down organic wastes. [Pg.79]

Secondary Treatment A wastewater treatment process used to convert dissolved or suspended materials into a form more readily separated from the water being treated. Usually the process follows primary treatment by sedimentation. The process commonly is a type of biological treatment process followed by secondary clarifiers that allow the solids to settle out from the water being treated. Sedimentation The process of subsidence and deposition of suspended matter from a wastewater by gravity. [Pg.625]

This treatment process employs the use of physical operations such as screening and sedimentation to partially remove suspended solids and organic matter from the wastewater. This process provides the secondary treatment with wastewater that is partially free of solids, in order to facilitate further treatment. The effluent from the primary treatment contains primarily organic matter and is characterized by a relatively high biochemical oxygen demand (BOD).2... [Pg.914]

TABLE 1 Comparative Operating Costs of Snowfluent versus Secondary and Tertiary Treatment of Wastewaters... [Pg.827]

Olson BH, Guinn VP. 1978. Accumulations of trace elements in soil and plants from land disposal of secondary domestic wastewater. In Land treatment of wastewater international symposium,... [Pg.157]

Sedimentation clarifiers are generally used for secondary clarification of wastewater. They are characterized by having four treatment sections ... [Pg.148]

Rozzi, A. et al.. Ozone, granular acHvated carbon, and membrane Heatment of secondary texHle effluents for direct reuse, Biol. Abwasserreinig Treatment of Wastewaters from Textile Processing), 9, 25, 1997. [Pg.1127]

In order to assess the effect of the secondary treatment of the wastewater mixtures, the following parameters were determined by standard methods Il6] COD, BODi, content of ammonia, nitrate, nitrite, and alkalinity of influent and effluent in addition to the dissolved oxygen and pH in the columns. [Pg.557]

Current processes for the treatment of wastewater may be divided into three main categories of primary treatment, secondary treatment, and tertiary or advanced treatment (Figure 7). [Pg.421]

Biologically active masses of microorganisms are used in the secondary treatment of municipal wastewater. Describe three ways of supporting a growth of the biomass, contacting it with wastewater, and exposing it to air. [Pg.151]

The main objective of the Clean Water Acts (CWA) of 1977, 1981 and 1987 is to maintain the chemical, physical, and biological integrity of the nation s waters. It seeks to have water quality which provides for the protection and propagation of fish, shellfish and wildlife and provides for recreation in and on the water. Under these Acts, each state is required to set its own water quality standards. All publicly owned municipal sewage treatment facilities are required to use secondary treatment for wastewater. To help states and cities build new or improved water treatment plants. Congress provides construction grants, which are administered by EPA. EPA allocates funds to states, which in turn distribute money to local communities. Between 1972 and 1982, EPA approved constmction grants worth nearly 33 billion. Between 1982 and 1992, another 24 billion was approved. [Pg.422]

A significant development in membrane technology has been the membrane bioreactor. This is a combination of a bioreactor (i.e. a reactor in which a biological process occurs, most commonly the secondary or activated sludge stage of a waste-water treatment system) with a membrane filter, operating in through-flow or crossflow. This has become a major system in the treatment of wastewater. [Pg.198]

Over the past decade, water pollution control has progressed from an art to a science. Increased emphasis has been placed on the removal of secondary pollutants, such as nutrients and refractory organics, and on water reuse for industrial and agricultural purposes. This in turn has generated both fundamental and appHed research, which has improved both the design and operation of wastewater treatment faciUties. [Pg.221]


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See also in sourсe #XX -- [ Pg.570 , Pg.570 ]

See also in sourсe #XX -- [ Pg.570 , Pg.570 ]




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