Denitrification of a Synthetic Waste with a Submerged Filter
Author : Dominic Joseph Grana
Publisher :
Page : 88 pages
File Size : 20,18 MB
Release : 1975
Category :
ISBN :
Author : Dominic Joseph Grana
Publisher :
Page : 88 pages
File Size : 20,18 MB
Release : 1975
Category :
ISBN :
Author : Wade H. Shafer
Publisher : Springer Science & Business Media
Page : 304 pages
File Size : 43,20 MB
Release : 2013-11-21
Category : Science
ISBN : 1475757824
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for lnformation and Numerica/ Data Analysis and Synthesis (C/NDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficia! to the academic and general scientific and technical community. After fi ve years of this joint undertaking we had concluded that it was in the interest of ali concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and App/ied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. Ali back issues can also be ordered from Plenum. We have reported in Volume 21 (thesis year 1976) a total of 10,586 theses titles from 25 Canadian and 219 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work.
Author : University of Missouri at Rolla
Publisher :
Page : 132 pages
File Size : 25,25 MB
Release : 1973
Category : Dissertations, Academic
ISBN :
Author : Donald D. McHarness
Publisher :
Page : 124 pages
File Size : 38,52 MB
Release : 1973
Category : Filters and filtration
ISBN :
Author :
Publisher :
Page : 440 pages
File Size : 23,22 MB
Release : 1974-02
Category :
ISBN :
Author : Pacific Northwest Laboratory
Publisher :
Page : 440 pages
File Size : 42,61 MB
Release : 1974
Category : Government publications
ISBN :
Author : Clifford W. Randall
Publisher : CRC Press
Page : 454 pages
File Size : 32,71 MB
Release : 1998-05-06
Category : Technology & Engineering
ISBN : 9780877629221
This book presents information that can be used for the design and operation of wastewater treatment plants that utilize biological nutrient removal processes, i.e., processes that utilize biological mechanisms instead of chemical mechanisms, to remove phosphorus and nitrogen from wastewaters. The book provides: basic fundamentals, concepts, and theories; design of prefermentation units, various types of BNR systems, and secondary clarifiers; retrofitting conventional activated sludge plants; modeling considerations; and special considerations for BNR systems. It includes full-scale and pilot plant case histories, design examples, and retrofit of existing plants.
Author : Council on Environmental Quality (U.S.)
Publisher :
Page : 450 pages
File Size : 12,17 MB
Release : 1974
Category :
ISBN :
Author : Ka-Man Tam
Publisher : Open Dissertation Press
Page : pages
File Size : 20,39 MB
Release : 2017-01-27
Category :
ISBN : 9781361429617
This dissertation, "Autotrophic Denitrification of Synthetic Wastewater in Biological Activated Filter (BAF) Reactors With Sulfur Media" by Ka-man, Tam, 譚家雯, 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: Abstract of thesis entitled AUTOTROPHIC DENITRIFICATION OF SYNTHETIC WASTEWATER IN BIOLOGICAL ACTIVATED FILTER (BAF) REACTORS WITH SULFUR MEDIA Submitted by TAM Ka Man for the Degree of Master of Philosophy at the University of Hong Kong in December 2006 Denitrification is an important process in wastewater treatment for controlling nitrate induced environmental problems. Autotrophic denitrification using elemental sulfur is applicable to wastewaters with a low carbon to nitrogen ratio. Nitrate is reduced to nitrogen gas with the help of Thiobacillus denitrificans while oxidizing sulfur to sulfate with the consumption of alkalinity. Though it has a slower reaction rate, autotrophic denitrification may be more economical than the commonly applied organic carbon utilizing heterotrophic denitrification. Biological Activated Filter (BAF) systems with fine media are commonly used in heterotrophic denitrification. However, the application of BAF with backwash for autotrophic denitrification has been rarely reported so far. The objectives of this study were (i) to evaluate the efficiency of sulfur-utilizing BAF reactors using synthetic wastewaters; (ii) to determine the effect of backwash, and, (iii) to identify the microbial characteristics in the sulfur-utilizing BAF reactors. Two pilot scale BAF reactors with sulfur media of 2-4mm in diameter and cultivated with autotrophic denitrifying bacteria were continuously fed in upflow mode with adjustable flow rate for more than one year. Synthetic wastewaters with concentrations of 220, 300 and 60mg NO -N/l were utilized to study the denitrification performance. Methanol and sodium benzoate at 25% and 50% of the stoichiometric requirement for heterotrophic denitrification were then added into the synthetic wastewater of 60mg NO -N/l to investigate their effects in autotrophic denitrification. Ten backwashes were carried out on the two reactors in upflow direction for 15-30min each with either water scour or combined water and air scours for 75%-100% bed expansion. The experimental results demonstrated that (i) sulfur-utilizing BAF reactors with 2- - 3 4mm diameter media can achieve a volumetric removal rate of 725g NO -N/m .d without the addition of organic carbon; (ii) addition of methanol and sodium benzoate at 25% and 50% stoichiometric requirement increases the volumetric - 3 - 3 removal rates to 928g NO -N/m .d and 1584g NO -N/m .d respectively with 3 3 reductions in alkalinity consumed and sulfate produced, but more frequent backwash was required; (iii) backwash can reduce the internal resistance with the reduction of headloss, rearrangement of media and removal of excess biomass and biofilm. Proper backwash with less than 60% biomass removal can improve the volumetric loading rate; in contrast, excessive backwash reduces the removal rate with accumulation of nitrite; and (iv) Thiobacillus denitrificans-like and Thiomicrospira denitrificans-like bacteria are the dominant species in the reactors. The diversity of bacteria in the biofilm is similar along the media bed and not significantly affected by backwash and the addition of organic carbon compounds. The application and engineering significance of sulfur-utilizing BAF reactors are discussed. DOI: 10.5353/th_b3878922 Subjects: Sulphur Denitrific
Author : Prashanthi Devi Marimuthu
Publisher : Springer Nature
Page : 323 pages
File Size : 32,86 MB
Release : 2021-04-08
Category : Science
ISBN : 3030641228
This book offers insights into the recent research focusing on green solutions to address environmental pollution and its impacts. Bioremediation is a vast area that encompasses numerous innovative and cost-effective experimental and research methods involvingnumerous technologies, such as biotechnological, biochemical, microbial, marine, chemical and engineering approaches. Featuring original research and review articles by leading experts, the book explores potential solutions to the growing issues of waste management and environmental pollution and their impacts, and suggests future research directions. As such, it is a valuable resource for professionals and general readers alike.