By Marcos Von Sperling
Activated Sludge and cardio Biofilm Reactors is the 5th quantity within the organic Wastewater remedy sequence. the 1st a part of the booklet is dedicated to the activated sludge strategy, protecting the elimination of natural subject, nitrogen and phosphorus. a close research of the organic reactor (aeration tank) and the ultimate sedimentation tanks is equipped. the second one a part of the e-book covers cardio biofilm reactors, specially trickling filters, rotating organic contactors and submerged aerated biofilters. For all of the platforms, the ebook offers in a transparent and concise approach the most strategies, operating rules, anticipated removing efficiencies, layout standards, layout examples, development facets and operational guidance. The organic Wastewater remedy sequence relies at the e-book organic Wastewater remedy in hot weather areas and on a hugely acclaimed set of top promoting textbooks. This foreign model is comprised via six textbooks giving a cutting-edge presentation of the technological know-how and know-how of organic wastewater remedy. different books within the organic Wastewater remedy sequence: quantity 1: Wastewater features, therapy and disposal quantity 2: easy rules of wastewater remedy quantity three: Waste stabilisation ponds quantity four: Anaerobic reactors quantity 6: Sludge remedy and disposal
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Extra info for Activated Sludge and Aerobic Biofilm Reactors: Biological Wastewater Treatment Volume 5
2. 3. 8 RECIRCULATION OF THE ACTIVATED SLUDGE To achieve a high concentration of solids in the reactor and a sludge age greater than the hydraulic detention time (θc > t), it is necessary to recirculate or retain the sludge in the system. The sludge retention processes can be adopted in systems with intermittent operation, such as batch systems. The sludge recirculation through pumping is the most commonly used and is typical of the continuous-ﬂow conventional activated sludge and extended aeration processes.
On the other hand, for sludge ages above the limit value, total destruction is achieved (in fact, in the calculation, the destruction component becomes larger than the production one). 26. When analysing the efﬁciency of a sludge digestion process, the concept of percentage destruction of volatile solids is normally used. For comparison purposes, the typical efﬁciencies in the reduction of volatile solids in the anaerobic sludge digestion vary from 45 to 60%, and in the aerobic (separate) digestion, they vary from 40 to 50% (Metcalf and Eddy, 1991).
35 are identical. Concerning the calculation of the distribution of the solids in the treatment, the daily production of VSS could have been obtained through the direct use of the simpliﬁed formula of Yobs . (b) Production of excess sludge The solids present in the raw sewage (inorganic solids and non-biodegradable solids) also contribute to the production of excess sludge. The methodology for calculating the VSS/SS ratio and the production of secondary sludge including these solids is described in the general example in Chapter 5.