Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Sludge production"”.
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Wastewater Carbon Diversion and Recovery via Primary Sludge Production, Thermal Hydrolysis, and Anaerobic Digestion
… and recovery through the enhancement of sludge production and blending, digestibility, dewaterability, and dewatered cake odor emission control. A comprehensive literature review showed that iron-based coagulants tend to show less negative impact than aluminum-based coagulants. This can …
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Aerobic biological treatment of a colloidal wastewater
… was to examine a modification of the activated sludge process known as contact stabilization. Both batch and continuous flow experiments were conducted under highly controlled laboratory conditions using a wastewater containing colloidal organic material to delineate process fundamentals. The …
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The development of process kinetics for a waste treatment system utilizing filamentous microorganisms
… tests such as pH, suspended solids, COD, BOD, sludge production, and oxygen utilization were used to determine the effects of parameters like flow rate, support media area, organic loading, pH, and the BOD-to-nitrogen ratio. Findings of the study indicated that the removal rate, suspended …
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MICROBIAL FUEL CELLS AS A PROMISING TECHNOLOGY FOR SIMULTANEOUS WASTEWATER TREATMENT AND BIOELECTRICITY GENERATION
… advantages over the conventional activated sludge method, such as elimination of the need for an external energy source, no excessive sludge production, and the ability to treat diverse wastewater streams. In addition to being an effective wastewater treatment method, MFCs offer potential …
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Utilization of fixed film media in BNR activated sludge systems
… to as the Integrated Fixed Film Activated Sludge (IFAS) systems. A fourth treatment train (Control train) was operated without any fixed film media. All experiments in this research were performed using domestic wastewater from Blacksburg, Virginia, and the Virginia Tech campus. Enhanced …
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Effect of phosphorus limiting conditions on process performance in activated sludge
… investigated using laboratory scale activated sludge units. Data were collected for COD:P ratios of 287:1, 212:1, 87:1 and 56:1 at several mean cell residence times. Data collected at COD:P ratios of 287:1 and 212:1 produced sludge with extremely poor settling characteristics and data were …
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Quantifying magnitude of potential phosphorus removal and recovery using plant-wide modeling
… removal configurations considered are activated sludge (AS), activated sludge with ferric chloride chemical precipitation (AS_CP), modified Bardenpho enhanced biological phosphorus removal (EBPR), and side-stream struvite precipitation (EBPR_FBR). State input variables (total P, total nitrogen, …
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Nitrification and denitrification: biological nitrogen removal and sludge generation at the York River treatment plant
… rates compared to literature values for similar sludge ages. The mean VIP nitrification rate was eight percent less compared to the A²/O mode. Denitrification varied with the amount of nitrate loading to the anoxic zone and the rate of total nitrate recycle. The amount of denitrification that …
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The effect of fixed film pretreatment on activated sludge stability during the treatment of cellulose acetate wastewater
The activated sludge (AS) process used for treating high-strength cellulose acetate wastewater of Celanese Corporation, Pearisburg, Virginia, produces a sludge with poor flocculation and settling characteristics, particularly during the periods of shock organic loadings. Pilot-scale treatment units …
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A study of nitrate versus oxygen respiration in the activated sludge process
Utilization of the activated sludge process is widespread although many of the mechanisms involved are still relatively misunderstood. Incorporation of nitrate respiration (denitrification) into the activated sludge process can have many advantages, but little is known about microbial growth and …
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Simulation and optimization of a package sewage treatment plant
… mounted overtop of a complete-mix activated sludge (CMAS) tank; the unit also has a primary sludge holding tank and a secondary clarifier. From consideration of reaction kinetics, reactor type, and geometry, a mechanistic model was developed to explain the phenomena of substrate removal in …
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Effect of mean cell residence time on the acid hydrolytic assist activated sludge process
… task. The acid hydrolytic assist activated sludge process is one method of minimizing sludge production from a biological wastewater treatment process. Acid hydrolysis of waste sludge involves pH adjustment to 1.0 or less followed by heat treatment. The hydrolyzed sludge can then be adjusted …
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Effect of mean cell residence time on the base hydrolytic assist activated sludge process
… and industrial wastewaters results in the production of wastes in the form of sludge. Since the quantity and characteristics of sludge depend upon the degree of treatment, the upgrading of treatment facilities has had the effect of increasing sludge production. Since the quantity of sludge …
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Treatment of food processing industrial wastewater using two stages anaerobic system
… process is favorable due to its low cost, biogas production, low sludge production and more. In this study, upflow anaerobic sludge bed (UASB) and hybrid-UASB (HUASB) reactors, were combined with anaerobic filter (AF) bioreactors forming two stages system to treat food processing industry …
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Effects of Integrated Fixed Film Activated Sludge on nitrogen removal in biological nutrient removal systems
… performance of Integrated Fixed Film Activated Sludge (IFAS) was evaluated for its effect on nitrification and denitrification in a bench scale biological nutrient removal (BNR) process configured as a Virginia Initiative Project (VIP) process. The IFAS systems consisted of a sponge - like …
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Electrocoagulation for Water Treatment: the Removal of Pollutants using Aluminium Alloys, Stainless Steels and Iron Anodes
… the advantages of short treatment times and low sludge production. The objective of this research was to determine the feasibility of the electrocoagulation technique as a method to remove pollutants from wastewater. Electrocoagulation tests were first carried out in phosphate-containing …
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Comparing the Metcalf and Eddy and UCT steady state guidelines for sizing of biological nutrient removal activated sludge wastewater treatment plants
… comparison of two steady state activated sludge (AS) design guidelines - the University of Cape Town (UCT) guideline used in South Africa and the Metcalf and Eddy (M&E) guideline used in North America and other parts of the world. It looks at the key similarities and differences between …
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Anaerobic and Combined Anaerobic/Aerobic Digestion of Thermally Hydrolyzed Sludge
Sludge digestion has gained importance in recent year because of increasing interest in energy recovery and public concern over the safety of land applied biosolids. Many new alternatives are being researched for reducing excess sludge production and for more energy production. With an increase in …
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Membrane Electrochemical Treatment of Landfill Leachate: Processes, Performance and Challenges
… by 100%, and NaOH by 55%. Consequently, the sludge production was reduced by 51% in weight and 12% in volume. Despite electricity consumption by the MER, the coupled system cost $4.76 per m3 leachate less than the standalone Fenton treatment. More notably, direct Fenton oxidation removed only …
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Performance and Mechanisms of Excess Sludge Reduction in the Cannibal™ Process
… study the performance and mechanisms of excess sludge reduction in the activated sludge that incorporates the Cannibal™ Process, laboratory activated sludge systems incorporating an anaerobic bioreactor into the sludge recycle stream were operated. In this study, the solids production in the …
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