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 A-stage.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Environmental Science and Development
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
