sludge conditioning Articles
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Comparison of saline wastewater treatment performance of SBR with repeated starvation under aerobic and non-aerobic conditions
This study investigated the effects of repeated starvation and feeding on the performance of a sequencing batch reactor (SBR) used for treating saline wastewater. The effects of aerobic and non-aerobic conditions on the sludge during starvation were evaluated to recover the performance of the SBR in terms of floc size and pollutant removal after resuming wastewater feeding. The floc size, fractal ...
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Orthophosphate removal from aqueous solutions using drinking-water treatment sludge
Drinking-water treatment sludge (DWTS) is a by-product generated during the production of drinking water where iron hydroxides are the main component of the sludge. The aim of the study presented here was to determine the effectiveness of using ferric sludge from two underground water treatment stations to remove orthophosphates from a model solution. The analyses were performed in static ...
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Chitosan use in chemical conditioning for dewatering municipal-activated sludge
This work aims to evaluate the potential use of chitosan as an eco-friendly flocculant in chemical conditioning of municipal-activated sludge. Chitosan effectiveness was compared with synthetic cationic polyelectrolyte Sedipur CF802 (Sed CF802) and ferric chloride (FeCl3). In this context, raw sludge samples from Beni-Messous wastewater treatment plant (WWTP) were tested. The classic jar test ...
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Combinative treatment (thermal–anaerobic) of EBPR sludge for the enhanced release and recovery of phosphorous
In the present study an attempt has been made to recover phosphorus in the presence of poly P and to disintegrate sludge through combinative treatment. Primarily the sludge was treated by thermal method at a temperature range of 40° to 90°C. During thermal treatment, enhanced biological phosphorous removal (EBPR) sludge releases poly P and is found to be maximum at 60°C for three hours. Increase ...
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Influence of nanoparticles on the polymer-conditioned dewatering of wastewater sludges
The effect of using small-scale, high surface area, nanoparticles to supplement polymer-conditioned wastewater sludge dewatering was investigated. Aerobically digested sludge and waste activated sludge sourced from the Hunter Valley, NSW, Australia, were tested with titanium dioxide nanoparticles. The sludge samples were dosed with the nanoparticles in an attempt to adsorb a component of the ...
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Effect of thermal alkaline pretreatment on the anaerobic digestion of wasted activated sludge
The effect of alkaline pretreatment of waste-activated sludge, using two models to study the sequential hydrolysis rates of suspended (Sanders' surface model) and dissolved (Goel's saturation model) solids, on the mesophilic and thermophilic anaerobic digestion rate is evaluated. The pretreatment, which reduces the size of the solids, increases the reaction rate by increasing the surface area and ...
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Phosphate release from waste stabilisation pond sludge: significance and fate of polyphosphate
Net phosphorus removal from waste stabilisation pond (WSP) systems is governed by the rate of phosphorus incorporation into the sludge layer and the rate of phosphorus release from this sludge back to the overlying wastewater. Luxury uptake of phosphorus by microalgae has been shown to occur under WSP conditions in the laboratory; however, the significance of this mechanism and the fate of ...
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Enhancing dewaterability of waste activated sludge by combined oxidative conditioning process with zero-valent iron and peroxymonosulfate
The enhancement of sludge dewaterability is of great importance for facilitating the sludge disposal during the operation of wastewater treatment plants. In this study, a novel oxidative conditioning approach was applied to enhance the dewaterability of waste activated sludge by the combination of zero-valent iron (ZVI) and peroxymonosulfate (PMS). It was found that the dewaterability of ...
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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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A method for visualising polyelectrolyte distribution after polyelectrolyte conditioning of a biotic sludge
Charge neutralisation is an important mechanism in (polyelectrolyte) conditioning of biotic sludges and required for efficient sludge dewatering. Based on results from streaming potential and zeta potential measurements, it has been suggested that charge neutralisation is more complete on the outside of the sludge flocs than on the inside. This paper discusses the development of a technique for ...
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Techase Environment | How to Choose a Super-convenient Filter Press?
TECHASE NEW TECHNOLOGY: 80% MC Sludge Feeding Directly As we all know, it is general necessary for conventional deep sludge dewatering flow to control the sludge moisture content at about 95%, and then the final pressing stage can be realized. However, Some sludge with 80% MC has to be diluted first which is more complex and expensive. NEW TECHNOLOGY: In response to the above problem, Techase ...
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Energy recovery from thermal treatment of dewatered sludge in wastewater treatment plants
Sewage sludge is a by-product generated from municipal wastewater treatment (WWT) processes. This study examines the conversion of sludge via energy recovery from gasification/combustion for thermal treatment of dewatered sludge. The present analysis is based on a chemical equilibrium model of thermal conversion of previously dewatered sludge with moisture content of 60–80%. Prior to ...
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Research on the microbial characters of mixture in an integrated A/O membrane bioreactor
An integrated anaerobe/aerobic membrane bioreactor (A/O MBR) was built and used to treat urban sewage water. The characters of mixture was researched and analyzed. Because the concentration of active sludge in MBR is high, the load of the sludge during the function is really low. When the active sludge functioned under low load condition, because of the low concentration of nutrition the ...
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Upgrading of an activated sludge wastewater treatment plant by adding a moving bed biofilm reactor as pre-treatment and ozonation followed by biofiltration for enhanced COD reduction: design and operation experience
A paper mill producing 500,000 ton of graphic paper annually has an onsite wastewater treatment plant that treats 7,240,000 m3 of wastewater per year, mechanically first, then biologically and at last by ozonation. Increased paper production capacity led to higher COD load in the mill effluent while production of higher proportions of brighter products gave worse biodegradability. Therefore the ...
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Relative kinetics of anaerobic digestion under thermophilic and mesophilic conditions
With several advantages over the conventional mesophilic anaerobic digestion, such as better sludge quality and higher biogas production, thermophilic anaerobic digestion is regarded as a promising alternative for sludge digestion. Primary and activated sludges are complex materials, and historically, analysis of kinetics has been largely on whole sludge, without analysis of individual ...
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Do you Know the Reasons for These Problems in the Aerobic Tank?
The aerobic tank is a structure that maintains the dissolved oxygen content suitable for the growth and reproduction of aerobic microorganisms through aeration and other measures to treat pollutants in the water. The function of the aerobic tank is to allow the activated sludge to perform aerobic respiration, further decompose organic matter into inorganic matter, and remove pollutants. ...
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Frequently Asked Questions and Troubleshooting in Activated Sludge Process (Part 3)
Q: What indicators can be detected for the microbiological ratio? And how can it be measured? Answer: The microfood ratio refers to the ratio of the organic matter content to the activated sludge concentration in the biochemical system before entering the biochemical system. Through this ratio, the load can be judged and the operation can be adjusted to avoid sludge aging and overage as well as ...
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