Read e-book online Activated Sludge and Aerobic Biofilm Reactors: Biological PDF

Environmental Studies

By Marcos Von Sperling

ISBN-10: 1843391651

ISBN-13: 9781843391654

Activated Sludge and cardio Biofilm Reactors is the 5th quantity within the organic Wastewater therapy sequence. the 1st a part of the ebook is dedicated to the activated sludge technique, masking the elimination of natural topic, nitrogen and phosphorus. an in depth research of the organic reactor (aeration tank) and the ultimate sedimentation tanks is supplied. the second one a part of the ebook covers cardio biofilm reactors, specially trickling filters, rotating organic contactors and submerged aerated biofilters. For the entire structures, the ebook provides in a transparent and concise method the most recommendations, operating ideas, anticipated elimination efficiencies, layout standards, layout examples, development points and operational directions. The organic Wastewater remedy sequence is predicated at the ebook organic Wastewater remedy in hot weather areas and on a hugely acclaimed set of top promoting textbooks. This foreign model is comprised by means of six textbooks giving a state of the art presentation of the technology and expertise of organic wastewater remedy. different books within the organic Wastewater therapy sequence: quantity 1: Wastewater features, remedy and disposal quantity 2: simple rules of wastewater therapy quantity three: Waste stabilisation ponds quantity four: Anaerobic reactors quantity 6: Sludge therapy and disposal

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Additional info for Activated Sludge and Aerobic Biofilm Reactors: Biological Wastewater Treatment Volume 5

Example text

In dynamic models this time lag should be taken into account, but it has no influence in steady-state models. This is the reason why So is considered as the total influent BOD. Another aspect to be remembered is that, if the treatment system is provided with primary sedimentation tanks, such as the conventional activated sludge system, part of the influent BOD is removed by sedimentation, corresponding to the settled fraction of the volatile suspended solids. These will undergo subsequent separate digestion processes in the sludge treatment line and will not enter the reactor.

When increasing Qr and maintaining Qex fixed, the underflow Qu increases. However, the total mass of solids in the system remains the same, since the removal of solids from the system was not changed (fixed Qex ). There is only a larger transfer of solids from the secondary sedimentation tank to the reactor, due to the increase in Qr . Thus, the solids mass in the reactor increases, but the mass in the system (reactor+secondary sedimentation tank) remains the same. If the sludge age is computed in terms of only the solids mass in the reactor, there will be an apparent increase in the sludge age.

00 kgSS/kgBOD5 applied (sludge age of 25 days). 4 for estimating the solids production in an activated sludge system taking into account the solids in the influent sewage. 2 Removal of the excess sludge (a) Without consideration of the influent solids In activated sludge systems, the excess sludge can be removed from two different locations: reactor or return sludge line. If the solids in the influent are neglected (unrealistic assumption for domestic sewage, but frequently adopted in the literature), the excess sludge concentration and flow, which vary with the removal place, can be determined as follows: • Withdrawal of the excess sludge directly from the reactor (or from the reactor effluent).

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Activated Sludge and Aerobic Biofilm Reactors: Biological Wastewater Treatment Volume 5 by Marcos Von Sperling

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