sludge mixing Articles
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Specific methanogenic activity of halophilic and mixed cultures in saline wastewater
ABSTRACT: Wastewater containing high concentrations of salt, are difficult to treat using biological treatment processes, especially anaerobic processes. Limited information is available on methanogenic activity in saline environments. The objective of this research was to investigate the activity of halophilic methanogens, digester sludge and a mixed culture of halophilic and methanogenic ...
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OUR Set-Point Control of Activated Sludge Processes
The OUR Set-Point method is useful for controlling the activity and loading-rate capacity of an activated sludge mixed liquor. In this case, sufficient amounts of a stock substrate are added to a mixed liquor suspension to provide kinetic saturation with subsequent measure of OUR. Once an acceptable substrate is found for a specific wastewater treatment plant, an OUR can be identified that ...
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Comparison of behaviour and fate of tetrabromobisphenol A (TBBPA) in membrane bioreactors and conventional activated sludge process
Research was completed on the behaviour and fate of tetrabromobisphenol A (TBBPA) in pilot-scale membrane bioreactors and conventional activated sludge (CAS) process at the City of Guelph Wastewater Treatment Plant. Emphasis was on the physicochemical processes, biological transformation and sorption kinetics. Measurement of TBBPA at the environmental level can be challenging, so the main focus ...
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Modeling and verification of selective sludge discharge as the controlling factor for aerobic granulation
Mathematical simulation and laboratory experiments were conducted to investigate the controlling factor for aerobic sludge granulation. A model was used to describe the biomass dynamics during the granulation process. The simulation results indicate that the selective discharge of small and loose sludge flocs is the key controlling factor for granulation. In the experimental studies, tests were ...
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Simulation of granulation index and its utility for predicting percentage granules in UASB reactors
This paper researches on the development of a dimensionless number for predicting percentage granulation in Upflow Anaerobic Sludge Blanket (UASB) reactors for treating biodegradable wastewaters. A Biomass Granulation Index (BGI) has been framed based on the experimental work conducted using laboratory scale UASB reactors. This index depends on mixing in the sludge bed, induced due to biogas and ...
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Project - WWTP Grevesmühlen, Germany
Plant: wwtp Elbersroth, Germany Contractor: E&P Anlagenbau, Germany Type of plant: Municipal Wastewater Treatment Plant Start-up: 2017 Application: Mixing for Sludge Stabilization (Primary and Secondary Sludge) in a Primary Sludge Tank Scope of supply: 1 HYPERDIVE - Mixer ...
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Development of a novel epigeic-anecic-based polyculture vermireactor for efficient treatment of municipal sewage water sludge
The potential of vermireactors, based on polyculture and monoculture system, was evaluated by using substrate consisted of domestic sewage sludge mixed with sugarcane trash, under laboratory conditions. Polyculture reactor was designed by using an epigeic (Eisenia fetida) and an anecic (Lampito mauritii) species of earthworm, while monoculture reactor had E. fetida only. Comparatively the end ...
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Renault Moscow Factory – Case Study
Project name Renault Moscow Factory Wastewater Treatment Plant Employer Kasa Stroy Co, Ltd. Contractor Enta Miihendislik Aritma Taah. San. Ve Tic. Ltd. Sti. Location of the plant Moscow/ RUSSIA Scope of work Industrial Wastewater Treatment Contract Date 2008 Completion Date 2009 Flowrate of the plant: 1.200 m3/day Inlet Pollution Parameters: COD: 1.000- 1.500 mg/ L SS: 200- 400 mg/ L PH: ...
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The effect of different mesophilic temperatures during anaerobic digestion of sludge on the overall performance of a WWTP in Sweden
This project was initiated to evaluate the effect of alternative process temperatures to 38 °C at the anaerobic digestion step in a Swedish wastewater treatment plant (WWTP) treating mixed sludge. The efficiency of the different temperatures was evaluated with respect to biogas production, volume of sludge produced and nutrient content in the reject water to find the optimum temperature for ...
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Automatic characterisation of primary, secondary and mixed sludge inflow in terms of the mathematical generalised sludge digester model
This paper presents the characterisation procedure of different types of sludge generated in a wastewater treatment plant to be reproduced in a mathematical model of the sludge digestion process. The automatic calibration method used is based on an optimisation problem and uses a set of mathematical equations related to the a priori knowledge of the sludge composition, the experimental ...
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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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Sludge drying mechanism
The low-temperature heat pump belt drying system is a closed circulation system, and the hot air can be recycled after being heated and dehumidified, without the need for external exhaust gas. In the process of sludge heating and drying, volatile organic compounds will be produced, which will be dissolved in the condensate along with the condensation of water vapor in the exhaust gas, so that the ...
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Environmental biodegradability of [14C]SWNT by Trametes versicolor and natural microbial cultures found in New Bedford Harbor sediment and aerated wastewater treatment plant sludge
Little is known about environmental biodegradability or biotransformations of single‐walled carbon nanotubes (SWNT). Because of their strong association with aquatic organic matter, detailed knowledge of the ultimate fate and persistence of SWNT requires investigation of possible biotransformations (i.e., biodegradation) in environmental media. In the present study, [14C]SWNT were utilized to ...
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Aerators and mixers enable cost savings, reduce biosolids buildup - Case Study
Problem The town of Monroeville, Ala., faced aeration and mixing issues, sludge buildup in one of its wastewater lagoons, and power bills of $12,500 per month after a major employer relocated its garment manufacturing facility. The company had generated about 90 percent of the wastewater entering the lagoon, and its fees covered 90 percent of the operation and maintenance cost, which included ...
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Wastewater treatment: how to prevent sludge settling in digesters
In municipal wastewater treatment plants, where large quantities of wastewater are treated and purified every day, anaerobic digestion is a key process for the sustainable reuse of stabilised sludge and its valorisation for energy purposes. In fact, anaerobic sludge digestion helps large wastewater treatment plants to: Stabilise the sludge and further reduce the pollutant load Valorise the ...
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The sludge dryer can treat all kinds of sludge
Sludge is a collective term for various types of sediments and floating objects produced by different treatment processes in water supply and wastewater treatment. The composition and properties of the sludge mainly depend on the composition, properties and treatment process. According to different classification standards. There are many classification methods for sludge, which are briefly ...
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Aerators and mixers enable cost savings, reduce biosolids buildup - Case Study
Problem The town of Monroeville, Ala., faced aeration and mixing issues, sludge buildup in one of its wastewater lagoons, and power bills of S12,500 per month after a major employer relocated its garment manufacturing facility. The company had generated about 90 percent of the wastewater entering the lagoon, and its fees covered 90 percent of the operation and maintenance cost, which included ...
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Influence of phenylacetic acid pulses on anaerobic digestion performance and archaeal community structure in WWTP sewage sludge digesters
The effect of phenylacetic acid (PAA) pulses on anaerobic digestion (AD) performance and archaeal community structure was evaluated in anaerobic digesters treating sewage sludge from a wastewater treatment plant (WWTP). Four pilot-scale continuous stirred tank reactors were set up at a full-scale municipal WWTP in Santiago de Chile, and fed with either primary or mixed sewage sludge. AD ...
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Evaluation of leached metals in recovered aluminum coagulants from water treatment slurry
The water treatment industry consumes large quantities of coagulant and produces huge amounts of slurry. The cost of alum used in water treatment, stringent regulations and negative impacts of sludge disposal are the motive to do integrated research studies on the technical feasibility of aluminum coagulant recovery from sludge using acidification. This work studied the leaching of iron, ...
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Proteomics reliability for micropollutants degradation insight into activated sludge systems
Little information is available on pharmaceutical trace compounds degradation pathways in wastewater. The potential of the proteomics approach has been evaluated to extract information on activated sludge microbial metabolism in degrading a trace concentration of a pharmaceutical compound (ibuprofen). Ibuprofen is one of the most consumed pharmaceuticals, measured in wastewater at very high ...
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