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A PILOT OPTIMIZATION OF SULPHATE PRECIPITATION IN THE HIGH-DENSITY SLUDGE PROCESS
Aube, B., M. Lamares, and S.L. Sang.
11th ICARD IMWA 2018 Annual Conference, September 10-14, Pretoria, South Africa. IMWA Proceedings (Volume II):971-976(2018)

A large study looked at control of sulfate, and the study details the optimization of sulfate removal in the high-density sludge (HDS) process. The HDS process was operated at different pH setpoints, varying sludge recycle rates, and several different reactor retention times for three different water sources. An added step in the process was the addition of carbon dioxide to precipitate calcium carbonate and further minimize the gypsum saturation level. The tests defined optimal HDS conditions to provide improved feed conditions for nanofiltration or for non-scaling process water. https://www.imwa.info/docs/imwa_2018/IMWA2018_Aube_971.pdf



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