Search results
Results from the WOW.Com Content Network
This increase in the amount of sewage sludge accumulation in the EU can be due to the increase in the number of households that are connected to the sewage system. [83] The EU has directives in place to encourage the use of sewage sludge in agriculture, in a way that the soil, humans, and the environment are not harmed. [84]
The goal of the pretreatment program is to protect municipal wastewater treatment plants from damage that may occur when hazardous, toxic, or other wastes are discharged into a sewer system, and to protect the quality of sludge generated by these plants. Discharges to a POTW are regulated either by the POTW itself, the state/tribe, or EPA. [40]
The Ohio EPA has withdrawn a controversial proposal to allow small, privately operated sewage-treatment plants to aid rapid development.
Many large cities in the U.S. operate combined sewers, which collect sewage and stormwater runoff in a single pipe system leading to the treatment plant. Combined sewers can cause serious water pollution problems due to combined sewer overflows, which are caused by large variations in flow between dry and wet weather.
The U.S. EPA, which mandated the project, had initially proposed the larger size for the tunnel, which will store combined sewage and stormwater for treatment in the city's wastewater treatment plant.
Sludge treatment technologies that are used for thickening or dewatering of sludge have two products: the thickened or dewatered sludge, and a liquid fraction which is called sludge treatment liquids, sludge dewatering streams, liquors, centrate (if it stems from a centrifuge), filtrate (if it stems from a belt filter press) or similar.
The directive aims to promote the safe use of sewage sludge in agriculture while protecting human health, soil, water, and the environment. It prohibits untreated sludge on agricultural land unless properly incorporated into the soil, mandates adherence to plant nutrient requirements, and prevents soil and water contamination.
Sewage can be treated close to where the sewage is created, which may be called a decentralized system or even an on-site system (on-site sewage facility, septic tanks, etc.). Alternatively, sewage can be collected and transported by a network of pipes and pump stations to a municipal treatment plant.