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The Sewage Sludge Directive has been evaluated several times under EU proposals to build a circular economy through the reduction and reuse of wastes. [98] [99] In 2014, a European Commission evaluation of the Sewage Sludge Directive suggested it was appropriate for its goals, and did not need revision.
Mesophilic anaerobic digestion (MAD) is also a common method for treating sludge produced at sewage treatment plants. The sludge is fed into large tanks and held for a minimum of 12 days to allow the digestion process to perform the four stages necessary to digest the sludge. These are hydrolysis, acidogenesis, acetogenesis, and methanogenesis.
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.
The directive triggered substantial investment in sewage treatment throughout the EU. A controversial aspect of the directive is the requirement for all agglomerations with more than 2,000 inhabitants to have a wastewater collection system, which has been widely interpreted as requiring connection to a sewer system even if existing on-site ...
Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges. [2]
The Urban Waste Water Treatment Directive (full title "Council Directive 91/271/EEC of 21 May 1991 concerning urban waste-water treatment") is a European Union directive regarding urban wastewater collection, wastewater treatment and its discharge, as well as the treatment and discharge of "waste water from certain industrial sectors".
Another advantage of renewable energy production, in specific of biogas from sewage sludge, is the contribution to waste management. In fact the recovery of the chemical energy involves the reduction of the sewage sludge volume. A smaller volume of sewage sludge is cheaper to transport and dispose of, decreasing operational costs.
Public Law 100-688 terminated the dumping of sewage sludge and waste from industrial companies (commencing with the 270th day after November 18, 1988) under certain conditions. [11] After December 31, 1991, it was prohibited to dump any type of sewage sludge and industrial waste.
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