| 21. | An activated sludge aeration basin with secondary clarifier is used for BOD reduction before discharge to the Mississippi River.
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| 22. | The result is a system which offers significant cost reduction compared to activated sludge and granular carbon treatment options.
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| 23. | An upgrade to the Activated Sludge plant began in 2014, and is expected to be completed in 2018.
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| 24. | Wasted Activated Sludge ( WAS ) is sent from the aeration basin to sludge lagoons, then to drying beds.
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| 25. | The amount of sewage sludge produced from the activated sludge process is directly proportional to the amount of wastewater treated.
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| 26. | The mixing modelling and design techniques applied to MBRs are very similar to those used for conventional activated sludge systems.
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| 27. | The activated sludge and partially treated sewage pass on to the final settlement tanks, where the sludge settles out.
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| 28. | In 1914, he began the first large-scale investigations of the new sewage treatment process called activated sludge.
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| 29. | Imhoff stated that the treatment efficiency of 60-80 percent could be achieved in highly loaded activated sludge basins.
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| 30. | Upgrading of the first Activated Sludge plant to use the'Simplex'system took place between 1970 and 1973.
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