sludge processing Articles
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New dimensiong guideline and standard for the activated sludge process
Since June 2016 a new standard for the design of activated sludge systems is valid. The most significant point is the change of the basic value from BOD to COD. The standard is also the basis for designing SBR-systems. The article discusses main aspects of the new design basis and how AQUA DESIGNER has been modified and adapted to this. In AQUA DESIGNER you can calculate the continuous and ...
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An innovative approach for modeling aerobic granular sludge processes. Proceedings WEFTEC.17
Abstract: An innovative biofilm model has been developed that allows modeling of a granular sludge sequencing batch reactor (GSBR) in a single tank without the need for a separate variable volume tank and a recycle stream. The model has a variable volume, supports separate or simultaneous feeding and effluent discharge, predicts the biofilm thickness without being constrained by a maximum ...
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Uncertainty and variability in enhanced biological phosphorus removal (EBPR) stoichiometry: consequences for process modelling and optimization
The overall potential for enhanced biological phosphorus removal (EBPR) in the activated sludge process is constrained by the availability of volatile fatty acids (VFAs). The efficiency with which polyphosphate accumulating organisms (PAOs) use these VFAs for P-removal, however, is determined by the stoichiometric ratios governing their anaerobic and aerobic metabolism. While changes in anaerobic ...
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Selection pressure theory for aerobic granulation – an overview
Aerobic granulation technology is an improvement over conventional activated sludge process, where cell-to-cell interactions lead to the formation of stable granules with excellent settleability. Selection pressures are the factors that can strongly influence the formation and growth of aerobic granules. Settling time and the volume exchange ratio (VER) will decide how long the bioparticles ...
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Nitrification and denitrifying phosphorus removal in an upright continuous flow reactor
Simultaneous nitrification and denitrifying phosphorus removal was achieved in a single-sludge continuous flow bioreactor. The upright bioreactor was aligned with a biomass fermenter (BF) and operated continuously for over 350 days. This study revealed that unknown bacteria of the Saprospiraceae class may have been responsible for the successful nutrient removal in this bioreactor. The ...
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Improvement and prediction of OSA system performance in sludge reduction through integration with thermal and mechanical treatment
The oxic–settling–anoxic (OSA) process is one of the sludge production reduction methods in the activated sludge process. In this method, sludge is stored in an anaerobic tank within the sludge return line before entrance into an aeration tank. Due to this method's flexibility in application to operating treatment plants and not being energy-consuming, its application is developing. In this ...
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Biological waste management of leather tannery effluents in India: current options and future research needs
This paper reviews the major biological treatment methods applied for tannery effluents in India. Anaerobic methods and activated sludge process have been the preferred treatment options. Sequencing batch reactor process holds promise for tannery effluents but the technology is yet to see the light of the day in India. Design of aerobic systems needs major overhaul through modelling approaches of ...
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Fate of selected pharmaceutically active compounds in the integrated fixed film activated sludge process
The potential for integrated fixed film activated sludge (IFAS) processes to achieve enhanced transformation of pharmaceuticals relative to conventional activated sludge (CAS) processes was assessed. Previous studies have focused on direct comparisons of parallel reactors with and without fixed film carriers and little information is available on the impacts of how varying operating ...
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Is It Time To Upgrade and Convert Your SBR?
Is your Sequencing Batch Reactor (SBR) or other activated sludge process in need of a cost effective upgrade or expansion due to it being outdated, overloaded, inefficient or undersized? Have potential changes to your effluent requirements forced you to look at more expensive and complicated alternate wastewater treatment technologies? You don’t have to start over. Fluidyne Corporation, the ...
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Shock load response in an SBR-activated sludge process treating high load wastewater
In this study, the production of storage polymers is made when cheese production wastewater is treated. Cheese plants typically produce high-strength wastewaters on an intermittent basis and are particularly suitable for treatment in Sequencing Batch Reactor (SBR) systems. The SBRs were operated in triplicate under two filling scenarios: 'React Fill' (RF) with mixing/aeration; 'Static Fill' (SF) ...
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Effect of the rotifer
Lecane inermis, a potential sludge bulking control agent, on process parameters in a laboratory-scale SBR systemThe influence of a high density of rotifers, which is known to be able to control filamentous bacteria, on the parameters of an activated sludge process was examined in four professional laboratory batch reactors. These reactors allow the imitation of the work of a wastewater treatment plant with enhanced nutrient removal. The parameters, including oxygen concentration, pH and temperature, were ...
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The effect of heavy metals on the activated sludge process and its microbial community analysis using 16S ribosomal DNA
The effect of heavy metal shock loading on biological treatment systems was studied by traditional methods and molecular biological techniques. Two kinds of SBR (sequence batch reactor) operation units, unacclimated and acclimated activated sludge systems, were studied. The addition of special nutrients and powdered activated carbon (PAC) to stimulate heavy metal uptake and recovery were studied. ...
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Removal of ZnO nanoparticles in simulated wastewater treatment processes and its effects on COD and NH4+-N reduction
For many engineered nanoparticles, the primary pathway of release into the environment is via sewage and industrial wastewater discharges. In this work, the removal of uncoated ZnO nanoparticles (ZnO NPs) during simulated wastewater treatment processes and its impact on treatment performance were examined. Simulated primary clarification removed the majority (about 70%) of the dosed ZnO ...
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Happy bacteria will help to keep your biological system trouble free !!!!
Every one of us gets stressed at any point of time but the level of stress differs from person to person. It is due to the reason that different people have different capacities to handle stressful situations. Some of us have acclimatized to the particular situation and in the same situation others will feel stressed. Here the level of stress matters and for humans it is defined by Perceived ...
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Long-term performance evaluation of EBPR process in tropical climate: start-up, process stability, and the effect of operational pH and influent C:P ratio
To date, little information is known about the operation of the enhanced biological phosphorus removal (EBPR) process in tropical climates. Along with the global concerns on nutrient pollution and the increasing array of local regulatory requirements, the applicability and compliance accountability of the EBPR process for sewage treatment in tropical climates is being evaluated. A sequencing ...
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Sequencing batch reactor
Sequencing batch reactors (SBR) sequential batch reactors are industrial processing tanks for the treatment of wastewater. SBR reactors treat waste water such as sewage or output from anaerobic digesters or mechanical biological treatment facilities in batches. Oxygen is bubbled through the waste water to reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) to make suitable for ...
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Sequencing batch reactor
Sequencing batch reactors (SBR) or sequential batch reactors are industrial processing tanks for the treatment of wastewater. SBR reactors treat waste water such as sewage or output from anaerobic digesters or mechanical biological treatment facilities in batches. Oxygen is bubbled through the waste water to reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) to make suitable ...
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How to Choose the Correct Biological Wastewater Treatment Process for Your Application
There is different discharge restrictions for wastewater produced by different sectors and industries. Treatment systems need to be designed around each individual application in order to specifically target and treat the pollutants produced by them. This is why it is important to choose the correct biological wastewater treatment process for secondary stage wastewater treatment. When choosing ...
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Atkinson, Nebraska; ISAM - Integrated Surge Anoxic Mix - Case Study
The City of Atkinson, Nebraska could not meet the Nebraska Department of Environmental Quality (NDEQ) effluent discharge requirements based on the new ammonia regulations. The existing plant also required extensive service and maintenance to keep the outdated equipment operational. Left with no choice, the plant needed to be upgraded. Client: Atkinson, Nebraska Solution: ISAM - Integrated Surge ...
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Sludge reduction by direct addition of chlorine dioxide into a sequencing batch reactor under operational mode of repeatedly alternating aeration/non-aeration
The effect of direct addition of chlorine dioxide (ClO2) into a repeatedly alternating aeration/non-aeration sequencing batch reactor (SBR) on its sludge reduction and process performance was investigated. The experimental results showed that the sludge reduction efficiency was 32.9% and the observed growth yield (Yobs) of SBR was 0.11 kg VSS (volatile suspended solids) /kg COD (chemical ...
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