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3 Municipal Wastewater and Sludge Treatment At municipal wastewater treatment plants in the United States, raw municipal wastewater undergoes preliminary, primary, secondary, and in some cases, additional treatment to yield treated effluent and a concentrated stream of solids in liquid, called sludge. The sludge is treated as required
In Saudi Arabia, industrial water demand has increased annually by 3% and expected to increase to 5 % in the future. • There are insufficient economic and water management studies for wastewater treatment. • Industrial water management in Saudi Arabia is a critical issue to minimize water use. •
