Download or read book Effects of Phosphorus Removal Chemicals Upon Anaerobic Sludge Digestion microform written by Warren B. (Warren Bert) Kindzierski and published by National Library of Canada. This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alum and ferric chloride are commonly employed to aid phosphorus removal in wastewater treatment. Previous studies have indicated the use of these chemical coagulants produce sludges that adversely affect anaerobic digestion. The objective of this research was to assess the magnitude of effects chemical coagulants have upon anaerobic digestion by monitoring methane production and measuring concentrations of aluminum or iron present during batch digestion of chemically precipitated sludge. Alum addition to wastewater produced sludge that demonstrated reduced methane production when batch digested anaerobically. The magnitude of the adverse effects on methane production increased with increasing aluminum concentrations up to 144 mg/L. The type or nature of chemical floe that forms during the actual coagulation process may play an important role in influencing the magnitude of the adverse effects during digestion. The nature of the chemical effect appeared to limit the extent or degree to which the anaerobic microorganisms were able to metabolize the organic wastes and appeared to occur with the non-methanogenic species. Ferric chloride addition to wastewater produced sludge that, when batch digested anaerobically, demonstrated reduced methane production, however the magnitude of the adverse effects did not increase with increasing iron concentrations up to 770 mg/L. The nature of the chemical effect appeared to occur with the non-methanogenic species.
Download or read book Fate and Effects of Chemically precipitated Phosphorus in Anaerobic Digestion written by Douglas Wayne Max and published by . This book was released on 1970 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study was conducted to determine the fate of chemically-precipitated phosphorus during the overall wastewater treatment process under actual field conditions. Specific objectives were: to evaluate the removal of phosphorus with alum and sodium aluminate in a pilot plant activated sludge system, to determine the fate of the precipitated phosphorus incorporated into the microbial floc when placed in an anaerobic environment, and to observe the effect of aluminum on the digestion process. Five 38-gpd continuous-flow activated sludge pilot plant units were operated at the Rolla Love Creek trickling filter plant and were fed with settled domestic sewage. The sludge from the pilot plants, mixed with an appropriate quantity of primary sludge from the plant, was used to maintain five 3-1 anaerobic digesters. The parameters employed during the aerobic studies were influent and effluent phosphorus and aluminum, total and volatile suspended solids, and chemical oxygen demand; and those used in the anaerobic studies were phosphorus and aluminum in the feed sludge, the supernatant and the digester sludge, volatile acids, and gas production. The addition of alum and sodium aluminate to the activated sludge aeration chamber effectively removed phosphorus from domestic wastewater without adversely affecting the efficiency of the process. The precipitated phosphorus was concentrated in the digester sludge and was not released to the supernatant during anaerobic digestion, and the high concentration of the aluminum ion in the digester sludge produced no detrimental effects. The chemical precipitation of phosphorus in the activated sludge aeration chamber and anaerobic digestion of the sludge produced were found to be a feasible and effective method of eliminating at least part of the phosphorus input to lakes and streams, and could be incorporated into existing or future treatment plants with little capital expense"--Abstract, leaf ii.
Download or read book Design Manual written by and published by . This book was released on 1987 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soluble Phosphorus Removal in the Activated Sludge Process written by Soap and Detergent Association and published by . This book was released on 1972 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Effects of Chemical Addition for Phosphorus Removal on the Performance and Operational Characteristics of an Activated Sludge Process written by D. H. Haycock and published by . This book was released on 1973 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Phosphate Removal from Wastewaters written by R. Ramadori and published by Pergamon. This book was released on 1987 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phosphorus Precipitation in Anaerobic Digestion Process written by Nuria Martí Ortega and published by Universal-Publishers. This book was released on 2006-06-27 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anaerobic digestion is the most widely process used for the stabilisation of wastewater treatment sludge. Organic matter is transformed into CH4 and CO2 by the action of different bacteria groups. The main advantages are the reduction of the volume of waste sludge and the production of methane gas that can be utilized as energy supply for the process. During anaerobic digestion of activated sludge from enhanced biological phosphorus removal process (EBPR-process), most of the phosphorus eliminated during the water treatment, as well as that from cellular lysis, is released. So that, phosphorus concentration in the digester increases and precipitation problems can occur. In this work, anaerobic digestion process of waste activated sludge and primary pre-fermented sludge was studied in a pilot plant. Furthermore, phosphorus balance was performed in order to quantify phosphorus precipitation in the digester. Separate and mixed thickening of sludges was carried out with the aim of study its influence in the process. NOTE: This thesis is in Spanish.
Download or read book Modeling Biological Phosphorus Removal in Activated Sludge Systems written by D. Brdanovic and published by CRC Press. This book was released on 2021-10-01 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text looks at different effects on the process of biological phosphorus removal. Topics include: biological phosphorus removal processes; process and molecular ecological studies; and the effect of potassium limitation on biological phosphorus removal.
Download or read book Phosphorus Removal by an Activated Sludge Plant written by Milwaukee (Wis.). Sewerage Commission and published by . This book was released on 1970 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Temperature and Mean Cell Residence Time on Enhanced Biological Phosphorus Removal by Activated Sludge written by Daniel Mamais and published by . This book was released on 1991 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phosphorus Removal written by and published by . This book was released on 1973 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Chemical Addition for Phosphorus Removal on Activated Sludge Treatment written by T. Clark and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Phosphorus Removal Activated Sludge Process in Warm Climates written by Cao Ye Shi and published by IWA Publishing. This book was released on 2011-03-15 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special Offer: Cao Ye Shi Author Set - Buy all three books together and save a total £76! Biological Phosphorus Removal Activated Sludge Process in Warm Climates presents the results of detailed research on the Enhanced Biological Phosphorus Removal (EBPR) activated sludge process under warm climate conditions (20oC - 30oC), which is part of the R & D program of Public Utilities Board (PUB) Singapore. The investigations and studies presented in this book are application-oriented, but at the same time the studies aim at an insightful understanding of the EBPR with the knowledge of the latest development in academic field. The focus points are: EBPR performance of laboratory-scale and full-scale activated sludge processes under the site conditions in warm climates The carbon competition and distribution between PAO and GAO (and denitrifiers) in the process The stoichiometry and kinetics of P-release, COD uptake in the anaerobic environment and P-uptake in the aerobic environment under different temperatures and operating conditions PAO and GAO population fractions, shift and dominance studies using FISH and batch tests The inter-relationships between the system performance, process design and the microbial community EBPR for industrial wastewater (high ratio of feed COD/P) treatment under warm climates. Together with the preceding book – Biological Nitrogen Removal Activated Sludge Process in Warm Climates – published by IWA in 2008, this book fills the gap of biological nutrient (nitrogen and phosphorus) removal in warm climates and provides unique experiences and knowledge for Process and design researchers and engineers in wastewater research, students and academic staff in Civil/Sanitation/Environment Departments, as well as Managers, Engineers and Consultants in water companies and water utilities. Visit the IWA WaterWiki to read and share material related to this title: http://www.iwawaterwiki.org/xwiki/bin/view/Articles/SELECTIONOFDOMESTICWASTEWATERTREATMENTSYSTEMSINWARMCLIMATEREGIONS
Download or read book An Investigation of Phosphorus Removal Mechanisms in Activated Sludge Systems written by W. E. Morgan and published by . This book was released on 1972 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Iron Facilitated Chemical and Biological Process for Phosphorus Removal and Recovery During Wastewater Treatment written by Kang Zhao and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "An Iron-facilitated Chemical and Biological Process for Phosphorus Removal and Recovery During Wastewater Treatment" by Kang, Zhao, 趙鈧, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Phosphorus (P) is an important pollutant of concern in wastewater that causes eutrophication and algal blooms in water body. On the other hand, P is a valuable natural resource for agricultural and industrial use. With the rapid depletion of mineral phosphorus on earth, there is a need to recover phosphorus from wastewater. In this study, a new chemical and biological process facilitated with iron dosing has been developed for P removal and recovery during wastewater treatment. The system consists of a main stream identical to the conventional activated sludge process in an aerobic sequencing batch reactor (SBR) for P removal and a side stream of sludge recirculation through an anaerobic SBR (AnSBR) for P release and recovery from the P-rich sludge. In the aerobic SBR treating a synthetic domestic wastewater, Fe(III) (FeCl3) was dosed to remove P by precipitation and adsorption. Fe(III) dosing at a Fe/P molar ratio of 1.5:1 could reduce the P concentration from more than 10 mg/L to below 1 mg/L in the final effluent. Compared to other dosing periods, dosing Fe(III) right before the SBR settling could achieve the best result in sludge flocculation and P removal. Meanwhile, organic removal was well maintained as 90% of the chemical oxygen demand (COD) was degraded in the aerobic SBR. In the AnSBR, phosphate precipitated with ferric iron in the sludge was released owing to microbial Fe(III) reduction, and a positive correlation was found between the phosphate and ferrous iron concentrations in the sludge suspension. Chemical tests showed that significant P release from Fe(III)-P occurred only if the acidic condition and the reducing condition were combined. For the AnSBR sludge, a higher organic loading, lower pH and higher biomass concentration resulted in a higher level of Fe(III) reduction and P release. Organic acidogenesis prevailed in the reactor and lowered the pH to 4.5, which facilitated the P release from the solid phase into the liquid phase. With a solids retention time (SRT) of 10 days, the anaerobic supernatant contained a phosphate concentration of up to 70 mg/L, while the settled sludge was returned to the aerobic SBR. The phosphate could be readily recovered from the supernatant with Fe-induced precipitation by aeration and pH adjustment, and the overall P recovery could be achieved at about 70%. In addition to the treatment performance, the speciation of P in the aerobic sludge and the anaerobic sludge also was investigated. A significant change in the immediately available P and the redox-sensitive P was found in the sludge through the aerobic-anaerobic cycle. Such chemical transformation is believed to be crucial to the P removal and recovery during the wastewater treatment process. DOI: 10.5353/th_b5153745 Subjects: Sewage - Purification
Download or read book Soluble Phosphorus Removal in the Activated Sludge Process Part 2 Sludge Digestion Study written by Soluble Phosphorus in the Activated Sludge Process, Part 1- Chemical-Biological Process Performances, Part 2- Sludge Digestion Study and published by . This book was released on 1971 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
