Abstract—The high rate activated sludge stage of the
multiple-stage sludge treatment plant is characterized by high
efficiencies of treatment, cost, and size, compared to
conventional activated sludge treatment plants. A pilot plant
with an industrial discharge flow of 135L/h was designed
according to the highly loaded activated sludge stage (A-stage).
The plant simulated the biological and chemical treatment of
sludge by adding alum to the aeration tank in dosages of 100,
150, 200 and 250 mg/L. The results clearly indicate that the
highly-loaded activated sludge, the A-stage of the
absorption/bio-oxidation system, has a high efficiency for the
elimination of organic and inorganic matters. Without adding
aluminum salt, the chemical oxygen demand, the total
phosphate and the total nitrate were approximately 52.43%,
47.82%, and 40.09% respectively. The chemical-biological
process with a dosage of 200mg/L alum resulted in 76.07%
reduced chemical oxygen demand and improved efficiency of
phosphate and nitrate removal to 73.5% and 66.98%
respectively compared with the biological process in the
Index Terms—Alum, COD, industrial wastewater, nitrate, phosphate.
Mamdouh Y. Saleh, Medhat H. Elzahar, and Mohamed Z. Elshikhipy are with the Civil Engineering Department, Faculty of Engineering, Port Said University, 42523 Port Said, Egypt (e-mail: email@example.com, firstname.lastname@example.org, email@example.com).
Gaber El Enany is with the Physical Chemistry, Physical and Mathematical Engineering Department, Faculty of Engineering, Port Said University, 42523 Port Said, Egypt (e-mail: firstname.lastname@example.org).
Cite:Mamdouh Y. Saleh, Gaber El Enany, Medhat H. Elzahar, and Mohamed Z. Elshikhipy, "Industrial Wastewater Treatment Using High Rate Activated Sludge and Alum Additive," International Journal of Environmental Science and Development vol. 5, no. 6, pp. 551-556, 2014.