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 25 for “"Secondary treatment"”.
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Honduras wastewater treatment : chemically enhanced primary treatment and sustainable secondary treatment technologies for use with Imhoff tanks
… the Imhoff tanks as well as designs for both pre-treatment and secondary treatment options appropriate for use in Honduras were developed. The recommended system allows achievement of regulatory effluent levels while maintaining low annual operating costs for the system.
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Theoretical and experimental study of electrochemically mediated adsorption processes
Water treatment by electrosorption is a topic of increasing interest in recent years due to the high efficiency, low cost, small footprint and no secondary treatment required. Electrochemically mediated adsorption, is one of the emerging electrosorption techniques. The great advantage of this …
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Investigating the relationship between nitrification and pathogen reduction in biological wastewater treatment systems
… to assess the potential of biological wastewater treatment systems in contributing to disinfection of municipal wastewater. The research focused on the microbial mediated processes occurring at secondary treatment and their effect on faecal coliform and E. coli numbers. The activated sludge system …
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Alternative primary treatment for energy-positive wastewater treatment: an exploration of pile cloth media filtration
Wastewater treatment is essential for safeguarding public health, preserving environmental integrity, and ensuring the sustainable management of water resources. However, many wastewater treatment facilities (WWTFs) in the United States are approaching the end of their operating lifespan and …
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Seawater as coagulant substitute and the effects on disinfection in chemically enhanced primary wastewater treatment : a case study of Paraty, Brazil and the Deer Island wastewater treatment plant, Boston
… on the design of an appropriate wastewater treatment facility for the City. The new and interesting use of seawater as a wastewater treatment tool and its effect on the disinfection potential of the treated effluent is also reviewed and tested in a series of jar tests and laboratory …
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Assessing the partitioning of pharmaceuticals and personal care products in secondary wastewater treatment and fate to the receiving environments
… in liquid and solid streams in a conventional secondary wastewater treatment plant and compared to predicted partition loadings and toxicity levels. The predicted partitioned loadings derived from the model were significantly different from partitioned loadings within the treatment plant. …
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An investigation of the operating characteristics and efficiency of a small sewage treatment plant
… a study of the performance of the new sewage treatment plant serving Blacksburg, Virginia and V. P. I. during the initial period of operation, 1948-1949. This plant, designed for a sewage flow of one million gallons per day, provides primary and secondary treatment. Standard analyses were …
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Full-scale operation of a tubular ultrafiltration system in the treatment of oily waste
… 0.2 to 1.0% oil. Pond effluent was sprayed on a treatment field and the remaining oil was degraded naturally. The daily flow to the spray fields averaged 80,000 gallons. In 1993, concerns about direct land treatment of the waste surfaced, due to new groundwater regulations issued by the West …
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The operation of a completely mixed activated sludge pilot plant employing alum addition for phosphorus removal
… waters has created a need to upgrade wastewater treatment processes. New treatment objectives, in general, relate to the removal of phosphorus, achieving nitrification, and essentially eliminating the carbonaceous oxygen demand of wastewaters prior to discharge. The objective of this study was to …
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Evaluation of an Electro-Disinfection Technology as an Alternative to Chlorination of Municipal Wastewater Effluents
… coliform removal from wastewater effluents after secondary treatment. Four bench scale batch electrochemical cells were assembled and operated in the laboratory: the first electro-disinfection reactor was set with aluminum electrodes, the second with standard 316 stainless steel electrodes, the …
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Chemical equilibrium modeling of phosphorus removal and recovery processes for advanced wastewater treatment
… and every day, thousands of wastewater treatment and recovery facilities treat billions of gallons of nutrient rich wastewater. During the treatment process, a large amount of sludge is produced and needs to be treated and disposed. The main process for sludge treatment is anaerobic …
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An assessment of endocrine disrupting potential of a New Zealand pulp and paper mill effluent using rainbow trout Oncorhynchus mykiss and mosquitofish Gambusia affinis
… Juvenile (+1 year) rainbow trout were exposed to secondary treated TMP /BK mill effluent at a range of concentrations from environmentally relevant (10%) to 70% (v/v) in two exposure studies. During both 21- and 56-day exposures to 10% and 30% (v/v) effluent, no statistically significant impacts …
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Exocellular Polymeric Substances, Bioflocculation and Sludge Settling Properties in a Combined Anaerobic/Activated Sludge Process
… processes for municipal wastewater treatment is quite recent; the studies developed have shown these processes are feasible for the removal of organic, nutrient substances and reduction of sludge produced. Previous studies developed at the Marrero Wastewater pilot plant (fully …
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AN INVESTIGATION OF AQUATIC MACROPHYTE-BASED AQUATIC WASTEWATER TREATMENT SYSTEMS FOR TEMPERATE CLIMATES (ELODEA NUTTALLII, PHOTOSYNTHESIS, NUTRIENT BUDGET, ACTIVE TRANSPORT, NITRIFICATION)
<p>Aquatic treatment systems are a low cost, low energy alternative to conventional treatment systems; they can provide secondary and advanced secondary wastewater treatment capabilities for small communities. Their potential application in temperate climates has been ignored. The research …
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Biological Aerated Filters: Oxygen Transfer and Possible Biological Enhancement
… was then operated for 5 months downstream of a secondary treatment unit at a domestic wastewater treatment facility. The study investigated the oxygen transfer capabilities of the nitrifying unit with high oxygen demand requirements through a series of aeration process tests and explored the …
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Trace metals in upper Susquehanna River ecosystem: environmental distribution, urban impacts, and interaction with sediment materials
… Sewage influent and effluent samples from two secondary treatment plants were analyzed to determine TM levels and to evaluate the efficiency of TM removal, which was normally 60%, but higher if the influent was more polluted. The discharge of sewage effluent into the river was found to increase …
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Development of a novel photocatalytic reactor for the treatment of polycyclic aromatic hydrocarbons.
… To attain sustainable removal from an industrial treatment point of view, a fast and effective remediation method is required. At 120 hours duration, this method is too slow, meaning that further investigation for a more rapid and effective method required. The photocatalysis remediation method …
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PHOSPHATE ADSORPTION AND DESORPTION ON TWO CONTRASTING SOILS USED FOR LAND TREATMENT OF WASTEWATER
<p>Land treatment of wastewater involves the use of plants and the soil to remove unwanted constituents. Removal of phosphorus is particularly important to avoid excessive biological activity in water systems receiving the treated wastewater. This research examines the phosphate adsorption - …
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Bacterial Responses to Silver Nanoparticle Treatment: Community Structure, Resistance, and Function.
… and engineered environments is wastewater treatment plants. As a society we rely on the biological removal of nutrients, which takes place primarily in the activated sludge of secondary treatment. Studies have already indicated possible, temporary decreases in removal efficiencies as well …
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Characterisation and fate of bleached kraft mill effluents from a New Zealand pulp and paper mill
… a significant bioaccumulation propensity. Treatment of the chlorination stage effluents in an aerated lagoon treatment system removed 80% of the chlorinated monoterpene alcohols but only a small fraction of the monoterpene hydrocarbons. It was concluded that these compounds were unlikely to …
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