aeration activator Articles
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The optimal dissolved oxygen profile in a nitrifying activated sludge process – comparisons with ammonium feedback control
Ammonium feedback control is increasingly used to determine the dissolved oxygen (DO) set-point in aerated activated sludge processes for nitrogen removal. This study compares proportional-integral (PI) ammonium feedback control with a DO profile created from a mathematical minimisation of the daily air flow rate. All simulated scenarios are set to reach the same treatment level of ammonium, ...
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A short-term investigation using In-situ ammonia monitoring at a WWT, M Keown Severn Trent Water
Summary: Two separate inlet streams are received for treatment at this works, one being predominantly domestic in origin and the other being predominantly industrial, arising from a local dye works. Their treatment is kept completely separate with municipal stream being subject to preliminary treatment, primary settlement, and secondary treatment in surface aerated activated sludge basins and ...
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What are the parameters of an extended-aeration activated-sludge system?
The activated sludge process is the most widely used biological water and wastewater treatment. As is well known, by its means, suspended-growth microorganisms are applied to breakdown wastes. Aeration, the mixing of air and a liquid, is the means used to speed the reactions involved. Aeration methods include spraying the liquid into the air; diffusing air into the liquid or agitating the liquid ...
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Increased plant efficiency, City of Checotah, Oklahoma
The City of Checotah, Oklahoma was experiencing excessive solids, foam and grease in their 0.5 MGD extended aeration activated sludge treatment facility. With a daily average flow of 0.25 million gallons per day, the plant had tremendous amounts of foam and grease in the aeration basin with the sidewalls caked with sludge. The centerwells of the clarifier were filled with foam and grease. The ...
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Project - WWTP DC Water Blue Plains, USA
Plant: DC WATER Blue Plains WWTP, Filtrate Treatment Facility, US Blue Plains Advanced Wastewater Treatment Plant is the largest plant in the world Engineer: World Water Works, Oklahoma City, OK, US Type of plant: Municipal Wastewater Treatment Plant Start-up: 2017 Application: Mixing and aeration in an activated sludge tank Scope of supply: Engineering & Design 24 INVENT ...
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Fault detection and isolation of sensors in aeration control systems
In this paper, we consider the problem of fault detection (FD) and isolation in the aeration system of an activated sludge process. For this study, the dissolved oxygen in each aerated zone is assumed to be controlled automatically. As the basis for an FD method we use the ratio of air flow rates into different zones. The method is evaluated in two scenarios: using the Benchmark Simulation ...
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Dynamic changes of bacterial community in activated sludge with pressurized aeration in a sequencing batch reactor
This study aimed to investigate the organic removal efficiency and microbial population dynamics in activated sludge with pressurized aeration. The activated sludge was fed with synthetic wastewater composed of simple carbon source to avoid the effect of complex components on microbial communities. The pressurized acclimation process was conducted in a bench-scale sequencing batch reactor ...
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Actively aerated methanobiofilters to control methane emissions from landfills
Methane (CH4) capture at sanitary landfills for energy recovery is capable of reducing the impact of CH4 on the global atmospheric carbon budget. However, gas capture may only be viable where gas quantities are high enough to warrant economical energy production. Considering the potential global warming impacts, there is a need to identify alternative methods to control landfill CH4 emissions to ...
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Accelerated anaerobic hydrolysis rates under a combination of intermittent aeration and anaerobic conditions
Anaerobic hydrolysis in activated return sludge was investigated in laboratory scale experiments to find if intermittent aeration would accelerate anaerobic hydrolysis rates compared to anaerobic hydrolysis rates under strict anaerobic conditions. The intermittent reactors were set up in a 240 h experiment with intermittent aeration (3 h:3 h) in a period of 24 h followed by a subsequent ...
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Mechanism studies on nitrogen removal when treating ammonium-rich leachate by sequencing batch biofilm reactor
The nitrogen removal mechanism was studied and analyzed when treating the ammonium-rich landfill leachate by a set of sequencing batch biofilm reactors (SBBRs), which was designed independently. At the liquid temperature of (32 ± 0.4)°C, and after a 58-days domestication period and a 33-days stabilization period, the efficiency of ammonium removal in the SBBR went up to 95%. Highly frequent ...
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Bio-Microbics RollsAIR New Aeration System
The RollsAIR Extended Aeration System is an Activated Sludge Treatment system utilizing an aerobic wastewater treatment process It is designed to be a simple, low-cost, robust system of its type. The complete RollsAIR system uses the MyTEE in the "headworks" zone to screen trash and settle grit. The MyTEE screen deflects non-soluble solids to stay in the vault. All non-biological screened and ...
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Flocculation prior to the belt filter - France - Case Study
Customer / Type of customer Cazaux sewage treatment plant - wastewater sludge flocculation Cazaux - FRANCE (33) Issue / Need This plant uses a biological treatment process, “extended aeration activated sludge”, followed by a water clarifier. The sludge is treated by a belt filter, which produces a product consisting of 83% water and 17% dry matter. Flocculation is used to ...
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Complete solids retention activated sludge process
In a slaughterhouse's full-scale extended aeration activated sludge wastewater treatment plant (WWTP), operating under complete solids retention time, the evolution of mixed liquor suspended solids (MLSS) and mixed liquor volatile suspended solids (MLVSS) concentration, food to micro-organisms ratio (F/M) and substrate utilization rate (SUR) were studied for over a year. Biomass growth phases ...
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Municipal wastewater treatment plants as pathogen removal systems and as a contamination source of noroviruses and
Enterococcus faecalis Municipal wastewater treatment plants play a crucial role in reducing the microbial and pathogen load of human wastes before the end-products are discharged to surface waters (final effluent) or land spread (biosolids). This study investigated the occurrence frequency of noroviruses, Enterococcus faecalis and Enterococcus faecium in influent, final effluent and biosolids from four secondary ...
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My diffuser goes up to eleven, actually twelve
Abstract Fine pore membrane diffusers arc used extensively worldwide for aeration of activated sludge basins. Aeration can account for as much as 60% of a plant's energy usage (Rosso, et al. 2005). Pore fouling and membrane material degradation can reduce energy efficiency of fine pore membrane diffusers to 50% of the original efficiency after just a few years of operation. Tins work ...
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Turning biological waste treatment plant sludge into a fuel source
North Carolina, as part of its landfill regulations, banned all waste treatment plant sludges from general landfills in March, 1989. Cranston Print Works Company was producing approximately 20 tons per day of 18% solid non-hazardous sludge in its extended aeration activated sludge waste treatment plant. Sludge disposal costs were $10,000 per week after the ban took effect. This paper traces the ...
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Floating Horizontal Aerators Enhance Eufaula, Alabama Activated Sludge Plant
The Eufaula, Alabama, wastewater treatment plant (WWTP) is an extended aeration activated sludge facility designed for an average daily flow rate of 2.7 million gallons per day (mgd). Prior to February, 2005 this WWTP used vertical aerators to provide oxygen and mixing in its aerator basins. The plant has two aeration basins, each 1.87 million gallons in volume, which had 160 horsepower (hp) of ...
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Achieving and maintaining of short-cut nitrification in a cyclic activated sludge system
A lab-scale Cyclic Activated Sludge Technology (CAST) system was operated more than 5 months to evaluate the effects of the operation mode on nitrogen removal performance and investigate a feasible method for achieving short-cut nitrification in the system. Results showed that nitrogen was removed by conventional biological nitrification and denitrification in traditional operation mode ...
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Bacterial composition and nutrient removal with a novel PIA-A2/O sewage treatment
A novel post intermittent aeration anaerobic–anoxic–oxic (PIA-A2/O) process was developed to integrate shortcut nitrification–denitrification with denitrifying phosphorus (P) removal for domestic sewage treatment. With the transformation in configuration and phased start-up strategy, the nitritation rate and the ratio of denitrifying phosphorus accumulating organisms to phosphorus ...
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Eliminating sludge islands in your wastewater lagoon
Old municipal and industrial wastewater lagoons have the tendency to build islands of sludge at various locations around the lagoon. It is most common for older lagoons to build such islands wherever wastewater enters the lagoons. Of course, this is because the solids entering the lagoon have enough weight to fall out of the water as flow velocity is reduced, so the solids pile up just after ...
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