An enhancement of normal sewage treatment operations to provide water of potable quality using further chemical and physical treatment; the highest drinking water standard achieved in the U.S.
The further processing of waste water in a sewage treatment plant which may involve further reduction in nutrient levels, filtration, use of constructed wetlands and higher levels of disinfection.
Removal of nitrates, phosphates, chlorinated compounds, salts, acids, metals and toxic organics after secondary treatment (see primary and secondary treatment).
provided by two nitrification towers, disinfection through the use of chlorine, and de-chlorination. Nitrification towers for ammonia removal were built in 1973 and were the first municipal installation to utilize the packed tower process. These towers have successfully met the plant's discharge permit conditions without the need for final filtration or sedemintation. Chlorine is applied to the tower effluent for disinfection. Sodium bisulfide is added to the final effluent to remove any remaining chlorine prior to discharging the treated water into the Ottawa River.
A process of water renovation that upgrades treated wastewater to meet specific reuse requirements. Also called Advanced Waste Treatment.
The removal of inorganic minerals and plant nutrients after primary and secondary treatment of sewage.
An advanced stage of wastewater treatment designed to remove nutrients or other constituents remaining after secondary treatment.
Postsecondary treatment of water designed to improve the quality of the water to the point where it can be put to a particular beneficial use.
after secondary treatment, the removal of nitrogen, phosphorus and other pollutants from wastewater.
The further treatment of biologically treated waste water by removing suspended matter to enable the effluent to comply with a standard more stringent than 30:20 (not containing more than 30 mg/L suspended solids and with a biological oxygen demand (BOD) not exceeding 20 mg/L) before discharge to a receiving water. Also termed ‘polishingâ€(tm). Note: this is not equivalent to disinfection. A system should be described as secondary treatment + disinfection, but not tertiary treatment.
Promotes growth of aerobic bacteria, which is used to treat sewage waste water, so that effluent leaving the tank meets local regulatory requirements.
Any type of water upgrade that improves treated wastewater to meet reuse requirements. This may include general cleanup of water, or elimination or certain parts of wastes inadequately removed by conventional treatment processes. The standard process would include chemical remedies and pressure filtration.
See also Effluent Polishing.- There are many differing types of tertiary treatment of effluents, the most common being, Grass Plots, Reed Beds, Upward flow Clarifier. Rapid Gravity Sand Filter, Microstrainer, Sand Filter, Drum Filter, Lagoons, Nitrifying Filter.
The treatment of wastewater beyond the secondary or biological stage. Normally implies the removal of nutrients, such as phosphorous and nitrogen, and a high percentage of suspended solids.
The use of physical, chemical, or biological means to improve secondary wastewater effluent quality.
The use of filtration to remove microscopic particles from wastewater that has already been treated to a Secondary Level. Anthracite coal is the filter medium used by the MWWD.
The advanced cleaning of wastewater that goes beyond secondary treatment. This process removes nutrients such as phosphorus and nitrogen and most biological oxygen demand and suspended solids.
any process following secondary treatment that removes more pollutants; essentially the same as advanced waste treatment.
Removal of residual suspended solids, usually by granular medium filtration. Disinfection is also typically a part of tertiary treatment. Nutrient removal is often included in this definition.
removal from wastewater of traces or organic chemicals and dissolved solids that remain after primary treatment and secondary treatment.
Advanced cleaning of wastewater that goes beyond the secondary or biological stage, removing nutrients such as phosphorus, nitrogen, and most BOD and suspended solids. (See: advanced wastewater treatment, primary treatment, secondary treatment.)
Full disinfection of liquid waste. Methods include chlorination and ozonation. Tertiary treatment produces drinkable water and is required for discharge into fresh water bodies.
A level of sewage treatment that is beyond secondary treatment by further reducing the level of nutrients and suspended solids.
The wastewater treatment process that exceeds secondary treatment; could include nutrient or toxic removal.
Advanced cleaning of wastewater that goes beyond the secondary or biological stage. It removes nutrients such as phosphorus and nitrogen and most suspended solids. Membrane technologies such as reverse osmosis are tertiary treatment processes.
A level of sewage treatment that is additional to secondary treatment by further reducing the level of nutrients or targeting a specific chemical or group of substances.
The third stage of treatment that brings water to a high degree of refinement or conditioning following the reduction of substances in the primary and secondary stages of treatment.
Additional treatment processes used to clean wastewater even further following primary and secondary treatment. Also known as advanced treatment.