International Journal of Environmental Science and Development

Abstract—In recent years the waste water ministerial regulations have led to a constant ascend in the purification performance demanded of waste water treatment plants. Because of this, the number of waste water treatment plants has been maturing, and technical complexity has also been growing. In order to hold the connected rising costs of capital expenditure and operation within bounds, sagacious process technology solutions have to be found. Besides having a deeper understanding of the individual processes, it is indispensable to consider the entire waste water treatment plant as a whole. Most treatment plants consist of a mechanical and biological waste water purification, sludge treatment and gas utilization. In three of these four stages, namely in the preliminary and secondary clarification of the waste water and in the thickening and dewatering of the sludge, the processes for solids/liquids separation are of crucial importance.
The efficiency of the solids/liquids separation is mainly influenced by the properties of the sludge.

Index Terms—Activated sludge, wastewater, microorganisms, treatment process.

B. Ahansazan, H. Afrashteh, N. Ahansazan, and Z. Ahansazanare with Ministry of Science, Research and Technology of Iran. Valiasr Technical College of Tehran, Iran (e-mail: b.ahansazan@yahoo.com).

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Cite:B. Ahansazan, H. Afrashteh, N. Ahansazan, and Z. Ahansazan, "Activated Sludge Process Overview," International Journal of Environmental Science and Development vol. 5, no. 1, pp. 81-85, 2014.