(1) The first major treatment in a wastewater treatment facility, usually sedimentation but not biological oxidation. (2) The removal of a substantial amount of suspended matter but little or no colloidal and dissolved matter. (3) Wastewater treatment processes usually consisting of clarification with or without chemical treatment to accomplish solid-liquid separation. Sometimes called primary wastewater treatment.

The first step in sewage treatment removes large solid objects by screens (filters) and sediment and organic matter in settling chambers (see secondary and tertiary treatment).

To take the solids from sewage water.

consists of screening, chemical treatment, grit removal and primary setteling. Plant influent is first treated by three self cleaning bar screens which remove debris greater than 1/2 inch in diameter. After screening, ferric/ferrous chloride is introduced into the flow stream to help in phosphorous removal. Inert matter is removed in two 5000 gallon grit removal tanks. After grit removal, polymers are added to the flow to improve settling of organics. This settling is accomplished in seven primary tanks with a combined volume of approximately two million gallons.

wastewater treatment using settling, skimming & chlorination (vs. secondary treatment)

the first major treatment process in a wastewater treatment facility where solids and liquids are separated. This is usually done through a settling process where the materials that float or settle are removed. Primary treatment removes about 30% of pollutants from domestic sewage.

The first stage of wastewater treatment involving removal of floating debris and solids by screening and/or settling.

Treatment which includes all operation prior to and including primary treatment, e.g., bar screening, grit removal, comminution, and primary sedimentation.

Initial stage of treatment of wastewater, primarily consisting of removal of settleable solids.

A wastewater treatment process that takes place in rectangular or circular tank and allows those substances in wastewater that readily settle or float to be separated from the water being treated.

The first level of treatment given to sewage to remove solids.

Is a physical process in which the sewage flow is slowed down in settling tanks or lagoons. The thicker part of the wastewater -- the sludge -- is then removed from the bottom and disposed of in a variety of ways. Floatable solids, oil and grease are usually skimmed off the surface before the remaining effluent is discharged into a waterbody.

the first step in sewage treatment to remove large solid objects by screens and sediment and organic matter by settlement.

The first major stage of treatment following preliminary treatment in a wastewater works, usually involving removal of settleable solids.

The first stage of wastewater treatment, including removal of floating debris and solids by screening and sedimentation.

the first stage of wastewater treatment that removes settled or floating solids only; generally removes about 40 percent of the suspended solids.

Removing solids and floating matter from wastewater using screening, skimming and sedimentation (settling by gravity).

Treatment steps including sedimentation and/or fine screening to produce an effluent suitable for biological treatment.

Compare? First stage of wastewater treatment in which solids are removed by screening and settling.

Removal of a portion of the suspended solids and organic matter from the wastewater.

mechanical treatment in which large solids are screened out and suspended solids in the sewage settle out as sludge. Compare secondary treatment, tertiary treatment.

First steps in wastewater treatment; screens and sedimentation tanks are used to remove most materials that float or will settle. Primary treatment removes about 30 percent of carbonaceous biochemical oxygen demand from domestic sewage. (See: advanced wastewater treatment, secondary treatment, tertiary treatment.)

The screening of stormwater flows to remove gross pollutants including sediment and coarse particles.

The first process in the wastewater treatment process where some of the suspended solids and organic matter are removed through sedimentation. Common usage of this term also includes preliminary treatment to remove wastewater constituents that may cause maintenance or operational problems in the system (i.e., grit removal, screening for trash and debris, oil and grease removal, etc.). See also Hyperion Sewage Treatment Plant.

The treatment used first or alone to treat cancer.

The key method for pollutant removal from sewage by means of sedimentation.

Physical processes used to substantially remove floating and settleable solids in wastewater. This process can include screening, grit removal, and sedimentation.

A wastewater treatment method that uses settling, skimming, and chlorination to remove solids, floating materials, and pathogens from wastewater. Primary treatment typically removes about 35 percent of BOD and less than half of the metals and toxic organic substances.

physical treatment of effluent by screening and settlement.

Refers to the removal of course material through screening and settling, in wastewater treatment.

The first of two stages in wastewater treatment. Screens and sedimentation tanks are used to remove most material that floats or that will settle.

A series of mechanical processes that remove solid material from wastewater. At the Sacramento Regional Wastewater Treatment Plant, primary treatment includes screening and settling processes.

The first level of wastewater treatment. It uses settling and skimming to remove solids, floating materials, and pathogens.

A process that removes solids from sewage before it is discharged or treated further.

1.nThe first major treatment in a waste water treatment works, consisting usually of sedimentation. 2. The removal of a substantial amount of suspended matter but little or no colloidal and dissolved matter.

First treatment after diagnosis.