secondary clarifier Articles
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N2O emissions from secondary clarifiers and their contribution to the total emissions of the WWTP
Recent studies have indicated that the emissions of nitrous oxide, N2O, constitute a major part of the carbon footprint of wastewater treatment plants (WWTPs). Denitrification occurring in the secondary clarifier basins has been observed by many researchers, but until now N2O emissions from secondary clarifiers have not been widely reported. The objective of this study was to measure the N2O ...
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Conversion of the RAS control at the WWTP Asselbrunn to sludge level
The paper presents the effects of gradual upgrade of existing secondary clarifiers of the waste water treatment plant (WWTP) Asselbrunn. From existing two clarifiers at the beginning only one has been modified (clarifier no. 2), while the other remained unchanged (clarifier no. 1). In a first step the intake structure of clarifier no. 2 has been modified at flow proportional return activated ...
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Headmax Suction head clarifier for ACC Beef reduces civil construction costs - Case study
ACC Beef operate a comprehensive wastewater treatment plant that was recently upgraded by Hydroflux Industrial to increase its capacity. The upgraded included the installation of a new primary DAF system (Hydroflux HyDAF), HUBER QPRESS Screw Press and a new secondary clarifier. A Hydroflux Epco HeadMax® Clarifier was selected for the process due to the fact the clarifier can be constructed ...
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Commissioning and operating submerged membrane bioreactors: a designer's perspective
Submerged Membrane Bioreactor (MBR) applications for wastewater treatment have taken off in recent years in New Zealand. From designer perspectives, the membrane modules replace the conventional secondary clarifier, thus eliminating solids settling issues and reducing plant footprint. This paper discusses the recent experiences of Harrison Grierson Consultants Limited designing and commissioning ...
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Novel method for sludge blanket measurements
The most widely used methods for sludge blanket measurements are based on acoustic or optic principles. In operation, both methods are expensive and often maintenance-intensive. Therefore a novel, reliable and simple method for sludge blanket measurement is proposed. It is based on the differential pressure measurement in the sludge zone compared with the differential pressure in the clear ...
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Electrolytic removal of ammonia from aqueous phase by Pt/Ti anode
This study investigated the mechanism and kinetic modeling of electrolytic degradation of ammonia with Pt/Ti anode. The results show that ammonia oxidation from direct oxidation or indirect oxidation with hydroxyl radicals was slow but can be observed under pH 9 and high initial ammonia concentration of 1,050 mg N L−1. Indirect oxidation with HOCl was the mechanism for the ...
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Algae Control Spray System for a southern Nevada Wastewater Treatment Plant
Nicknamed "NESI" by the facility staff both because of its large size and slight resemblance to the mythical Lochness Monster, this WeirWasher Automated Cleaning System also has the important ability to submerge, resurface, and telescope. These motions are necessary to control the prolific algal growth on the weirs and effluent launder in the circular secondary clarifier. The spray ...
By GillTeq, LLC
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A mass balance approach to the fate of viruses in a municipal wastewater treatment plant during summer and winter seasons
In contrast to previous discussion on general virus removal efficiency and identifying surrogates for human pathogenic viruses, this study focuses on virus retention within each step of a wastewater treatment plant (WWTP). Additionally, the influence of weather conditions on virus removal was addressed. To account for the virus retention, this study describes a mass balance of somatic ...
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Replacement of 130 ft Secondary Clarifiers at a 25 MGD wastewater treatment facility
Challenge A municipal WWTP found that (2) of their secondary clarifiers were too rusted and corroded to properly function. A traditional clarifier refurbishment consisting of sandblasting and painting was not a viable option because one of the clarifier rake arms had recently broken due to its poor condition. The plant engineers decided that a clarifier rebuild was necessary to ensure proper ...
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Impact on sludge inventory and control strategies using the benchmark simulation model no. 1 with the Bürger-Diehl settler model
An improved one-dimensional (1-D) model for the secondary clarifier, i.e. the Bürger-Diehl model, was recently presented. The decisive difference to traditional layer models is that every detail of the implementation is in accordance with the theory of partial differential equations. The Bürger-Diehl model allows accounting for hindered and compressive settling as well as inlet ...
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Feasibility of UASB/trickling filter systems without final clarifiers for the treatment of domestic wastewater in small communities in Brazil
The paper analyses the concept and performance of different configurations of compact UASB/TF systems, without the final clarification stage, in relation to the removal of organic matter. The experiments were carried out in two sets of UASB/TF systems operating without secondary clarifiers, as follows: (i) four shallow (2.50 m height) TFs, each one filled with a different packing material; and ...
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Nutrient Optimization for Pulp & Paper Wastewater Treatment Plants - An Opportunity for Major Cost Savings
Abstract Pulp & paper wastewater treatment plants (WWTP) often add nitrogen and phosphorus to ensure optimum performance. If there are insufficient nutrients for bacterial metabolism, an increase in effluent total suspended solids (TSS), biological oxygen demand (BOD) and/or chemical oxygen demand (COD) may occur. As well, nutrient deficiency can cause or contribute to acute or chronic ...
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Hunter water`s Largest treatment plant installs Logmax® Clarifiers with Cleansweep® - Case study
Body CopyThe Burwood Beach WWTP is the largest sewage treatment system that Hunter Water operate, with a processing capacity of 44 million litres per day, or up to a population equivalent of 190000. A recent upgrade included the installation of a new secondary clarifier system. EPCO Australia were awarded the design, fabrication, installation and commissioning of a 33M diameter peripheral drive ...
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Bioelectrochemical nitrogen removal as a polishing mechanism for domestic wastewater treated effluents
Addition of an external carbon source is usually necessary to guarantee a sufficiently high C/N ratio and enable denitrification in wastewater treatment plants (WWTPs). Alternatively, denitrification processes using autotrophic microorganisms have been proposed i.e., with the use of H2 as electron donor or with the use of cathodic denitrification in bioelectrochemical systems (BES), in which ...
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Ozone-based reclamation of an STP effluent
The system ozone and hydrogen peroxide was used to reclaim wastewater from the secondary clarifier from a Sewage Treatment Plant (STP) of Alcalá de Henares (Madrid-Spain). The assays were performed by bubbling a gas mixture of oxygen and ozone, with ~24 g Nm-3 of ozone concentration, through a volume of wastewater samples for 20 minutes at 25°C . The removal of dissolved ...
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Simulation of wastewater treatment plant within integrated urban wastewater models
In the federal state of Hesse in Germany the application of an integrated software modelling framework is becoming part of the planning process to attain legal approval for the operation of combined sewer systems. The software allows for parallel simulation of flow and water quality routing in the sewer system and in receiving rivers. It combines existing pollution load model approaches with a ...
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Case Study - The performance of the grease degrading bioproduct greasolux in the meat manufacturing factory and municipal WWTP
Problem A municipal waste water treatment plant in one Baltic town continuously had problems with the fat, oil and grease (FOG) accumulation in the sewer lines, lift stations and waste water treatment plant, since the start up of a local meat processing facility. The highly polluted waste water directly impacted the treatment plant in the following ways: Increased grease accumulation in sewer ...
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Foam control in a food processing wastewater SBR treatment unit case study
Cost-Effective Biological Foam Control Using Microcat DF Defoamer The sequencing batch reactor activated sludge plant (SBR) operating on a potato processing wastewater is experiencing a severe foaming episode. The foam can reach three inches in depth reducing the efficiency of the surface aerators and causing odors. The treatment system consists of primary filtration and an SBR aeration ...
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A simple empirical model for the clarification-thickening process in wastewater treatment plants
In wastewater treatment plants (WWTPs), activated sludge is thickened in secondary settling tanks and recycled into the biological reactor to maintain enough biomass for wastewater treatment. Accurately estimating the activated sludge concentration in the lower portion of the secondary clarifiers is of great importance for evaluating and controlling the sludge recycled ratio, ensuring smooth ...
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Case study: Pulp & paper plant
OverviewEuropaper produces tissues paper for Industrie Cartarie Tronchetti, which has its own branch (Foxy). Changes in the paper production were followed by an increase of the BOD load in the wastewater. Therefore the existing water treatment plant had to be upgraded. RequirementsAn increased BOD load in the wastewater, caused by a conversion of production, required an upgrade of the existing ...
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