Download or read book Anaerobic Digestion of Thickened Waste Activated Sludge Containing Iron Phosphates written by Alan Gene Hartenstein and published by . This book was released on 1970 with total page 202 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 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 Phosphorus Removal written by Water Resources Scientific Information Center and published by . This book was released on 1973 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: 490 references and abstracts from Selected water resources abstracts through Feb. 15, 1973 (v. 6, no. 4). Each entry consists of title, author, source, descriptors, identifiers, abstract, and accession number. Keyword index.
Download or read book Wastewater Sludge Processing written by Izrail S. Turovskiy and published by John Wiley & Sons. This book was released on 2006-08-08 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reap the benefits of sludge The processing of wastewater sludge for use or disposal has been a continuing challenge for municipal agencies. Yet, whensludge is properly processed, the resulting nutrient-rich product--biosolids--can be a valuable resource for agriculture and other uses. Wastewater Sludge Processing brings together a wide body of knowledge from the field to examine how to effectively process sludge to reap its benefits, yet protect public health. Presented in a format useful as both a reference for practicing environmental engineers and a textbook for graduatestudents, this book discusses unit operations used for processing sludge and the available methods for final disposition of the processed product. Topics discussed include sludge quantities and characteristics, thickening and dewatering, aerobicand anaerobic digestion, alkaline stabilization, composting, thermal drying and incineration, energy consumption, and the beneficial use of biosolids. COMPREHENSIVE IN ITS COVERAGE, THE TEXT: * Describes new and emerging technologies as well as international methods * Compares different types of sludge processing methods * Explains both municipal and industrial treatment technologies Written by authors with decades of experience in the field, Wastewater Sludge Processing is an invaluable tool for anyone planning, designing, and implementing municipal wastewater sludge management projects.
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 Effect of Acid and Base Pretreatment on the Anaerobic Digestion of Excess Municipal Sludge written by and published by . This book was released on 2005 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The treatment and disposal of sewage sludge is a growing problem worldwide due to the continuing increase in sludge production from biological wastewater treatment plants and recent stringent regulations regarding sludge treatment and disposal. To date, the primary disposal methods for the excess sludge produced are landfilling, incineration and application in agricultural or forestland [1]. The high water content of the sludge makes incineration expensive and faces restrictions on disposal in modern landfills due to the tendency to reduce the amount of organic matter applied. Agricultural use seems to be the best options but several constraints exist due to health related problems such as odors, heavy metals content or pathogens and hazardous compounds that may be present in the sludge preventing their use in farming [2]. In this context, anaerobic sludge digestion represents a good sludge treatment alternative, decreasing the amount of solids present in the sludge with consequent reductions in disposal cost. Furthermore, we have to consider the advantage represented by energy recovery in the form of methane production that can be utilized as an energy source at the facility [3]. The present research project evaluates the combined use of hydrochloric acid (HCl) and sodium hydroxide (NaOH) for sludge chemical pretreatment to improve the performance of anaerobic digestion by extending the effectiveness of solids hydrolysis which is considered the rate-limiting step in the process [4]. The effect of temperature and the length of pre-treatment were initially evaluated to optimize the pretreatment process prior to use of any anaerobic treatment. Once the results of this experiment are analyzed, the performance of anaerobic digestion with chemical pretreatment using different combinations of primary and waste activated sludge pretreatment with either acid or base was studied. Two different SRTs for anaerobic digestion, 10 and 20 days, were investigated using duplicate reactors for each condition. Two reactors (number 1 and 6), used as control, were fed with a mixture of untreated primary and waste activated sludge in a mass ratio 1:1 with a combined VSS concentration around 30 g/l. Two reactors (number 2 and 4) were fed with a mixture of primary sludge pretreated with HCl and activated sludge pretreated with NaOH. The last two reactors (number 3 and 5) were fed with a mixture of primary sludge treated with NaOH and activated sludge treated with HCl. The same primary and waste activated sludge mass ratio as the one used to feed the control reactors were maintained in the four reactors fed with the chemically pretreated sludge. Monitored parameters were: TSS, VSS, total and soluble COD, Total Kjheldahl Nitrogen (TKN), Ammonia, Volatile Fatty Acids (VFA), pH, Phosphates, metals concentration, fecal coliforms concentration and gas production and composition. As expected, the results showed that 20 days SRT provided higher VSS and COD removal than 10 days SRT for all the three configurations evaluated. For both SRTs, the mixture of primary sludge treated with NaOH and activated sludge treated with HCl resulted in higher VSS and COD removal. VSS removal averaged from 37.2% in reactor 1 and 38.6% in reactor 6 for the 10 days SRT. Increasing the SRT to 20 days led to 46.6% and 44% VSS removal for reactor 1 and 6, respectively. Reactors 2 and 4 led to an overall average VSS removal of 44% for the 10 days SRT experiment which increased to around 50% in both reactors during the 20 days SRT experiment. For both SRTs, reactors 3 and 5 provided the highest average solids reduction with values around 46% for 10 days treatment and close to 53% for 20 days SRT (Chapter 7.2.1). It has to be considered that, in terms of maximum solids destruction, for the 10 days SRT experiment, a highest solids removal value of 47.8% was achieved in reactor 3 while 56.7% removal was obtained in reactor 5 when the SRT increased to 20 days. A similar trend was obtained when the COD removal has been considered. The two control reactors, 1 and 6, averaged from the 37.2% and 38.1% removal for the 10 days SRT experiment to values around 45% when the SRT was increased to 20 days. An overall average COD removal of 44.5 and 43.2% was achieved in reactors 2 and 4, respectively, for the 10 days SRT experiment and increased to around 47% in both reactors when the SRT was increased to 20 days. For both SRTs, reactors 3 and 5 provided the highest average COD removal with values around 45% for 10 days treatment experiment and close to 51% for 20 days SRT. For both retention times, all reactors exhibited good reproducibility in the replicates. Volatile fatty acids (VFAs) concentration was very low for both 10 and 20 days SRT in all reactors and weekly gas analysis exhibited a methane content of approximately 65%, meaning good overall performance of anaerobic digestion. The research proposed showed that anaerobic sludge digestion can be successfully used as sludge treatment alternative to reduce the amount of solids present in the sludge, with consequent reductions in disposal costs. Furthermore, compared with other sludge pretreatment options, the combined use of strong acid and strong base as chemical sludge pretreatment resulted in a good balance between solids reduction, process stability and cost reduction.
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 Removal and Recovery of Metals and Phosphates from Municipal Sewage Sludge written by Donald S. Scott and published by . This book was released on 1980 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EPA 600 1 written by and published by . This book was released on 1970 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thickening and Dewatering Characteristics of Activated Sludge Containing Metal precipitated Phosphorus written by Lyle Wayne Merritt, 1942- and published by . This book was released on 1971 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The purpose of this research study was to investigate methods for the disposal of activated sludge containing metal-precipitated phosphorus. To accomplish this objective, chemically-treated activated sludge or a mixture of the secondary sludge with primary sludge were thickened and dewatered by vacuum filtration and centrifugation. The putrescibility of the dewatered secondary sludge was also evaluated, and since anaerobic digestion is the usual method of sludge treatment, a digestion study was conducted. Secondary sludge for these studies was produced in five 38-gpd (144-1/day) activated sludge pilot plants operated at the Rolla Southeast Treatment Plant. Ferric chloride and alum were added directly to the aeration chambers of four of the plants, while the fifth served as a control; and the effectiveness of Fe++ and Al+++ in removing phosphorus from wastewater was evaluated. The addition of chemical precipitants to the activated sludge aeration chamber had a beneficial effect on the treatability of the sludge from the standpoint of vacuum filtration, but did not significantly alter its thickening and centrifuging characteristics; Al+++ had a greater effect than Fe+++ on all the sludge characteristics studied. The putrefactive characteristics of the dewatered metal-precipitated sludges were similar to those of a control sludge. Very little difference in gas production and composition was experienced during the anaerobic digestion of the chemically-treated sludges and the control sludge. Addition of either Al+++ or Fe+++ to the activated sludge system effectively reduced the concentration of phosphorus released in the effluent; however, greater removals were achieved with Al+++ than with Fe+++ when both were applied at equal M/P ratios"--Abstract, leaf ii.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 1336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heavy Metals in Water excluding Mercury written by Water Resources Scientific Information Center and published by . This book was released on 1977 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soluble Phosphorus Removal in the Activated Sludge Process written by David A. Long and published by . This book was released on 1971 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective was to develop and evaluate, at full plant scale, the combined chemical-biological process of phosphorus removal. Alum proved to be a more effective precipitant than sodium aluminate in the moderately alkaline wastewater used. Total phosphorus concentration of the unfiltered effluent was dependent upon effluent suspended solids levels as well as on effluent soluble phosphorus concentrations. Removal of organic matter was improved as a result of chemical addition in the chemical-biological process. The chemical-biological process produced approximately twice as much weight of sludge as did the parallel control. Alum addition did not reduce the sludge volume index (SVI) of the mixed liquor whereas sodium aluminate addition resulted in significant decreases. Costs for chemical precipitation of phosphorus in the chemical-biological process are estimated.
Download or read book Improved Anaerobic Digestion of Waste Activated Sludge with Chemical Pretreatment written by Jih-Gaw Lin and published by . This book was released on 1989 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Monitoring in Biogas Plants written by Bernhard Drosg and published by . This book was released on 2013 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
