After primary treatment, removal of biodegradable organic matter from sewage using bacteria and other micro-organisms, inactivated sludge or trickle filters. Also removes some of the phosphorus (30%) and nitrate (50%) (see primary and tertiary treatment).

includes aeration and secondary settling. Primary effluent and biologically acitvated sludge are mixed and flow through one of five areation basins. After being aeriated for aproximately eight hours, the flow is routed into final settling tanks where the remaining organic solids are removed.

A wastewater treatment process used to convert dissolved or suspended materials into a form more readily separated from the water being treated.

wastewater treatment employing biological treatment in addition to primary wastewater treatment

the second major step in the wastewater treatment process where bacteria consume the organic parts of the waste. It is accomplished by bringing together waste, bacteria, and oxygen in trickling filters or in the activated sludge process. This treatment removes floating and settleable solids and when combined with primary treatment about 90% of the oxygen-demanding substances and suspended solids. Sludge disposal is included and disinfection is the final stage of secondary treatment.

Biochemical treatment of wastewater after the primary stage, using bacteria to consume the organic wastes. The secondary treatment step includes aeration, settling, disinfection and discharge through an outfall. Secondary treatment in conjunction with primary treatment removes about 85 to 90 percent of suspended solids in wastewater.

In wastewater treatment, the conversion of the suspended, colloidal and dissolved organics remaining after primary treatment into a microbial mass with is then removed in a second sedimentation process. Secondary treatment included both the biological process and the associated sedimentation process.

part of the water treatment process where oxygen is added to the water and tiny bacteria clean it Minnehaha: Point-Source Pollution

Following primary treatment, bacteria are used to consume organic wastes. Wastewater is then disinfected and discharged through an outfall.

Stage of wastewater treatment wherein bacteria are used to break down organic materials and significantly reduce biochemical oxygen demand.

The removal or reduction of contaminants and BOD of effluent from primary wastewater treatment.

Purification stage where smaller solids settle out of partially-treated water, and microorganisms are further broken down by algae and sunlight. After secondary treatment, water is often chlorinated as a last step before it is released from the plant.

The most common treatment of sewage removing solids, bacteria and disinfectants.

Also known as biological treatment, further reduces the amount of solids by helping bacteria and other microorganisms consume the organic material in the sewage. Oxygen is critical to this treatment stage. Air activated sludge and biological filters are two of many methods of secondary treatment.

after primary treatment, removal of biodegradable organic matter from wastewater by bacteria and other micro-organisms.

The treatment of waste water, usually after removal of suspended solids, by bacteria under aerobic conditions during which organic matter in solution is oxidised or incorporated into cells, which may be removed by settlement. This may be achieved by biological filtration or by the activated-sludge process. Sometimes called ‘aerobic biological treatmentâ€(tm).

The biological portion of wastewater treatment which uses the activated sludge process to further clean wastewater after primary treatment. Generally, a level of treatment that produces 85 percent removal efficiencies for biological oxygen demand and suspended solids. Usually carried out through the use of trickling filters or by the activated sludge process.

The treatment of wastewater through biological oxidation after primary treatment.

Second stage of wastewater treatment that uses biological process in which bacteria consume organic matter, then settle out as sludge.

Compare? The second step taken by a Publicly Owned Treatment Works in which bacteria consume the organic parts of the waste. This treatment usually removes about 90% of all solids and oxygen-demanding substances.

Bacterial decomposition of suspended particulates and dissolved organic compounds that remain after primary sewage treatment.

Removal of biodegradable organics and suspended solids. Disinfection is also typically included in the definition of conventional secondary treatment.

second step in most waste treatment systems, in which bacteria break down the organic parts of sewage wastes; usually accomplished by bringing the sewage and bacteria together in trickling filters or in the activated sludge process. Compare primary treatment, tertiary treatment. Compare primary treatment, tertiary treatment.

A type of wastewater treatment used to convert dissolved and suspended pollutants into a form that can be removed, producing a relatively highly treated effluent. Secondary treatment normally utilizes biological treatment processes followed by settling tanks and will remove approximately 85% of the BOD and TSS in wastewater. Secondary treatment for municipal wastewater is the minimum level of treatment required by the Clean Water Act. See also Hyperion Sewage Treatment Plant.

The process used to reduce the amount of dissolved organic matter and further reduce the amount of suspended solids and coliform in wastewater.

A wastewater treatment method that usually involves the addition of biological treatment to the settling, skimming, and disinfection provided by primary treatment. Secondary treatment may remove up to 90 percent of BOD and significantly more metals and toxic organic material than primary treatment.

biological degradation of effluent which has already received primary treatment. The process may also involve some chemical and physical treatment.

The second step in publicly owned waste treatment systems, in which bacteria consume suspended organic matter through processes that bring waste, bacteria, and oxygen together.

Biological and mechanical processes that remove dissolved organic material from wastewater. At the Sacramento Regional Wastewater Treatment Plant, secondary treatment includes a biological process occurring inside oxygen reactor tanks and a settling process.

A level of wastewater treatment beyond primary treatment. It typically involves biological reduction in concentrations of particulate and dissolved oxygen-demanding pollutants.

As relates to waste water treatment, the process which makes up the second step in treating waste water and removes suspended and dissolved solids and biochemical oxygen demand (BOD) from the waste water which has already undergone primary treatment.

Treatment of boiler feedwater or internal treatment of boiler water after primary treatment.