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Showing 1 to 13 of 13 for “"Settling tanks"”.
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Mathematical simulation of dynamic behaviour of secondary settling tanks
… theoretical and practical aspects of secondary settling tank developments closer together. This was achieved firstly, by evaluating and developing empirical relationships from which the flux theory constants may be derived from simpler sludge settleability measures; and secondly, by developing a …
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Finite element analysis of flows in secondary settling tanks
Secondary settling tanks (SSTs) form a crucial part of wastewater treatment plants. Besides having to produce the separation of suspended solids and clarified effluent the secondary settling tank is used to concentrate and recycle the settled sludge to the biological reactor. The efficiency of the …
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ΠΕΙΡΑΜΑΤΙΚΗ ΚΑΙ ΑΝΑΛΥΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΥΔΡΟΔΥΝΑΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΚΑΙ ΤΩΝ ΧΑΡΑΚΤΗΡΙΣΤΙΚΩΝ ΚΑΘΙΖΗΣΗΣ ΣΕ ΔΕΞΑΜΕΝΕΣ ΚΑΘΙΖΗΣΗΣ
… IS PRESENTED FOR THE DESCRIPTION OF FLOW AND SETTLING IN SETTLING TANKS. A LITERATURE SURVEY IS PRESENTED CONCERNING THE FACTORS THAT MAYAFFECT THE EFFICIENCY OF SETTLING TANKS. PRESENTATION OF MODEL EQUATIONS AND THE METHODOLOGY OF THEIR SOLUTION. THE K-Σ MODEL OF TURBULENCE HAS BEEN USED. …
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Comparison of the 1D idealised flux theory and a 2D hydrodynamic model with full scale secondary settling tank performance data
… was applied to full-scale circular secondary settling tanks (SSTs) with the principal aim to 1) establish whether or not it "automatically" reproduces a flux rating <1.0 with respect to the steady state 1D idealized flux theory (1DFT) and; 2) determine what factor influence this flux rating.
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Secondary Clarifier Modeling: A Multi-Process Approach
The performance of settling tanks depends on several interrelated processes and factors that include: hydrodynamics, settling, turbulence, sludge rheology, flocculation, temperature changes and heat exchange, geometry, loading, the nature of the floc, the atmospheric conditions and the total …
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Full-scale trials of external nitrification on plastic media nitrifying trickling filter
… a scheme, the full influent flow (after primary settling) is discharged to the anaerobic reactor of the BEPRAS system, after which the activated sludge is separated from the water by internal settling tanks. The clarified supernatant is pumped to the trickling filter for nitrification and the …
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Bioflocculation: Implications for Activated Sludge Properties and Wastewater Treatment
… that bioflocculation is important in determining settling, dewatering, effluent and digested sludge properties (activated sludge properties) and may be vital to the function of all processes related to the above properties. In these studies, it was shown that divalent cations such as calcium and …
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An experimental investigation of the stresses in the floor and wall of a cylindrical steel tank
… the classical methods of the design of circular tanks. The need for a fast and efficient method by which engineers may determine the "indeterminate" stresses that exist in the walls and floors of circular tanks, of steel and concrete, has long been recognized. A simplified approach to the …
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Design and performance of BNR activated sludge systems with flat sheet membranes for solid-liquid separation
… is traditionally achieved by means of secondary settling tanks (SSTs), however recently the use of membranes for solid-liquid separation has gained popularity for the following reasons: Membranes are able to retain all solids and thus are insensitive to the settling characteristics of sludges, • …
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Treating wastewater in a conventional activated sludge (CAS) system or a Membrane Bioreactor (MBR). A comparison of capital and operating costs
… this has been achieved using Secondary settling tanks (SSTs) for liquid/solid separation in combination with a biological reactor (for biological degradation of organic matter). SSTs, however, require a large space, which becomes onerous on land requirements. In an immersed membrane …
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The effect of high solid retention times in activated sludge reactors on operational costs at Mitchells Plain WWTP
… the reactor and sludge overflow from secondary settling tanks that have reached their limits in the surface area required for the given solids thickness. Rising cost in electricity and fuel are a daily reality for all in South Africa (SA), resulting in acute energy awareness in all sectors of …
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Primary sedimentation tank model with characterized settling velocity groups
… the separation of solids and liquid in primary settling tanks (PSTs) of wastewater treatment systems. These physical processes are described by various settling conditions such as discrete and flocculent settling, along with other phenomena such as flocculation, coagulation, ammonification or …