digester performance Articles
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Research on the stability of heavy metals (Cu, Zn) in excess sludge with the pretreatment of thermal hydrolysis
Thermal hydrolysis (TH) has been used to improve anaerobic digestion performance as well as the stability of heavy metals in sludge. Because the toxicity of heavy metals is closely related to both the concentration and the chemical speciation, more exhaustive studies on speciation distribution are urgently needed. This research aimed to investigate the effects of TH treatment (especially the ...
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Using Granular Sludge to Improve Digester Performance
Granular sludge technology compounds already impressive benefits of anaerobic digestion Anaerobic digestion is a robust process that transforms organic waste into valuable biogas for energy, as well as nourishing biosolids for agriculture. Applied in wastewater treatment, it also has the advantages of: Purifying even challenging, high-organic-load wastewater Lowering utility bills and ...
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The effect of mixing conditions on anaerobic digester performance
The basic principle of aerobic wastewater treatment is the conversion of some parts of organic matters to biomass and this causes production of excessive sludge in aerobic processes. This excessive sludge is withdrawn from time to time to prevent accumulation of biomass in aeration basin. In most cases, this sludge requires the stabilization before the dewatering and disposal. Different processes ...
By ORBIT e.V.
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The anaerobic baffled reactor (ABR) treating communal wastewater under mesophilic conditions: a review
A review concerning the anaerobic baffled reactor (ABR) treating communal wastewater under mesophilic conditions is presented. Existing studies indicate strong resilience of the reactor towards loading variations and shock-loads. The compartmentalisation of the ABR is a strongly stabilising factor with feed fluctuations being evened out across reactor chambers. Significant chemical oxygen ...
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Thermal hydrolysis of the lipid and protein fractions of wastewater sludge: implications for digester performance and operational considerations
ABSTRACT Thermal hydrolytic pretreatment of wastewater sludge followed by mesophilic anaerobic digestion poses significant benefits in terms of sludge minimization and pathogen reduction; however, high levels of volatile fatty acids (VFA) in digester effluent reveal an interruption in the efficient conversion of organic material to methane gas. Residual soluble chemical oxygen demand (COD) not ...
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The effect of direct addition of iron(III) on anaerobic digestion efficiency and odor causing compounds
The role of iron addition to sewage sludge prior to anaerobic digestion was evaluated to determine the effect of iron on digestion performance and generation of odor-causing compounds. Hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) were the odorous gases evaluated in this study. Samples were obtained from seven municipal wastewater treatment plants (WWTPs), and batch ...
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Impact of cleaning agents on Anaerobic Digestion performance - Case Study
SENTRY-AD is a real-time, bio-electrode sensor that allows for the monitoring of microbial metabolic activity in the anaerobic digestion (AD) wastewater treatment process. The data generated by the bio-electrode sensor allows operators to monitor the impact of toxic chemicals on microbial health in the AD system. Cleaning agents, biocides, are used for equipment and container sterilization in ...
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Anaerobic digestion of sludge differing in inorganic solids content: performance comparison and the effect of inorganic suspended solids content on degradation
High inorganic suspended solids (ISS) content of sludge in many areas (especially with combined sewage systems) results in low VS/TS (volatile solids, VS; total solids, TS) levels and raises concerns about its effect on anaerobic digestion. The performances of sludge anaerobic digestion with different feeding VS/TS levels as well as the effect of ISS content on the anaerobic degradation ...
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How can a city’s wastewater plant produce over 10% more energy while consuming less polymer? - Case Study
JP Vodovod-Kanalizacija in Ljubljana, Slovenia, wastewater treatment Did you know: RheoScan, our automated optical polymer measurement and dosage system, helped one wastewater plant to achieve 34% lower polymer consumption in the belt thickener alone, and more than 10% increase in annual biogas production. When it comes to sustainable wastewater treatment, one plant in Ljubljana, ...
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Beating treatment to enhance digestibility of fresh grass
Anaerobic digestion (AD) is one of the most popular biomass conversion technologies. AD can be further divided into four stages: pre–treatment, digestion, gas upgrading and digestate. The main goal of pre–treatment is to improve degradability of the material in order to enhance gas production and anaerobic digester performance. Beating treatment as a new mechanical treatment technique has been ...
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Optimising thermal hydrolysis for high digester solids loading and performance
CAMBI UK - Activities Building new Cambi plants in the UK, upgrading existing ones: Current Projects: Cotton Valley (Milton Keynes) Whitlingham (Norwich) Bran Sands (Middlesborough) Aberdeen upgrade Chertsey Operations Commissioning and optional operational contracts Chertsey STW, Client: Thames Water Built 1998 and retrofitted in 2005 as part of a 7 year mini DBO by Cambi Features ...
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Analysis of metal concentration levels in water, sediment and fish tissues from Toledo municipal lake by applying SR-TXRF technique
The main objective of this study was to evaluate the metal content in water and sediment from the Toledo municipal lake, as well as the concentration levels of heavy metals in muscle and liver of four fish species. A digestion procedure was performed in all fish samples. Metal analysis was performed by using the Synchrotron Radiation X-ray Fluorescence technique. The accuracy and validity of the ...
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Process optimization with RheoScan at a wastewater treatment plan in Ljubljana, Slovenia - Case Study
Smart sludge control In Ljubljana, Slovenia, one particular customer in the wastewater industry has continuously sought to improve efficiency. That is why the plant owner tested our Rheo-Scan, an automated, optical polymer measurement and dosage system at the belt thickening stage to reduce polymer consumption and enhance digester performance, in 2014. The challenge: Reduce polymer costs and ...
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Advanced anaerobic processes to enhance waste activated sludge stabilization
The requirement for enhanced stabilization processes to obtain a more stable, pathogen-free sludge for agricultural use is an increasing challenge to comply with in the waste hierarchy. With this in mind, the Routes European project (‘Novel processing routes for effective sewage sludge management’) is addressed to assess innovative solutions with the aim of maximizing sludge ...
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A critical review of experimental and predicted methane generation from anaerobic codigestion
Anaerobic digestion is increasingly being considered as a treatment option for an extensive range of waste biomass, due to the potential for energy recovery, in the form of methane production, and lower sludge volumes relative to aerobic treatment processes. Furthermore, when two substrates are codigested (i.e. digested together), added benefits are foreseeable, such as increased methane ...
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Optimising thermal hydrolysis for reliable high digester solids loading and performance
Chertsey (Thames Water) Cambi thermal hydrolysis was refurbished during the early part of 2005 and started operation in August 2005 under a separate contract to Cambi operations. The plant has run continuously since that time except for planned shut downs (inspection and Christmas day) with 2 hours of unplanned shut down. Initially it was envisaged the plant would achieve an average of 22 dry ...
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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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optAER Fine-Bubble Aeration and in-Lagoon Upgrades - Case Study
Problem Your lagoon has served your community or company well for so long but now modern regulations or sludge buildup make it untenable. You don’t want to give up on your existing infrastructure, and more mechanical solutions require higher level operations training. The Nexom Answer optAER fine-bubble aeration and in-lagoon upgrades turn your lagoon into a modern treatment plant for ...
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Aerators Enhance Aerobic Digestion Process
The city of Eden,N.C.,operates an extended aeration process designed for an average flow rate of 13.5 mgd with a mixed liquor suspended solids concentration that typically checks in about 6,000 mg/l. This high biomass concentration is necessary to provide a well-settling sludge and good effluent quality. Further, the plant influent is approximately 40% domestic wastewater and 60% industrial ...
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ABS Innate Microbial Enhancer
Anaerobic digestion facilities is recognized by the United Nations Development Program as one of the most useful decentralized sources of energy supply, as they are less capital intensive than large power-plants. The technical expertise required to maintain anaerobic digesters coupled with high equipment cost lower process efficiencies have so far limited the level of its industrial application ...
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