آخرین محصولات
Strength and microstructure properties of solidified sewage sludge …
Sewage sludge (SS) produced by water treatment plants tends to be characterized by high water content and high organic matter, showing the characteristics of easy flow and poor engineering ...
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Influence of flocculation on sewage sludge thickening and …
CONF12-010 ECSM 2012 – 3r d European Conference on Sludge Management Leon, Spain, 6&7 September 2012 INFLUENCE OF FLOCCULATION ON SEWAGE SLUDGE THICKENING AND DEWATERING P. Ginisty 1, J. Olivier 2, J. Vaxelaire 2, S. Fortuny 1 1IFTS, BP 292, 47007 Agen, France 2 ENSGTI, Université de Pau et des Pays de …
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1.4: Coagulation and Flocculation
The first two steps include the processes of coagulation and flocculation. In this process, colloidal particles are destabilized to gather all the suspended material together. They can also be referred to as nonstable solids. This process increases particle sizes which assists in removal during the filter process.
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Re-flocculation reduces the effectiveness of sewage sludge …
A method of the image analysis was developed as a tool to measure dispersion of sludge flocs to assess the re-flocculation degree. For this purpose, the projected area A [μm 2] of flocs was measured.Then the equivalent diameter D eq [μm] of a circle having the floc's projected area A was determined following the methodology used by Mesquita et …
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A review of flocculants as an efficient method for increasing the
The article presents issues related to the theory of flocculation, sewage sludge, and its dewatering. The main mechanisms of flocculation, the kinetics of the …
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Understanding and optimization of the flocculation process in
The aim of this review is to summarize the current state of understanding of the factors that affect sludge flocculation so that evaluation of such information can be facilitated and strategize for intervention in the sludge flocculation and deflocculation process. ... Sewage / chemistry Sewage / microbiology Waste Disposal, Fluid / methods* ...
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Flocculation of sewage sludge with FeCl3
This treatment plant receives both urban and industrial sewage water (700 000 p.e.), and treats sewage by the conventional activated sludge process. The sludge produced from primary and secondary sewage treatment is anaerobically digested and then treated with flocculants to reduce phosphorous content and improve sludge dewatering …
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Enhanced Dewatering of Activated Sludge by Skeleton-Assisted …
Sludge dewatering is the fundamental process of sludge treatment. Environmentally friendly and efficient sludge conditioning methods are the premises of sludge to achieve dehydration reduction and resource utilization. In response to sewage plant sludge dehydration, fly ash (FA), polymerized aluminum chloride (PAC), and …
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Re-flocculation reduces the effectiveness of sewage sludge …
Re-flocculation reduces sludge disintegration efficiency before anaerobic digestion. • The degree of sludge re-flocculation can reach 86%. • The susceptibility to …
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Coagulation/flocculation in dewatering of sludge: A review
Sludge dewatering is an essential process in sludge disposal, and it is important for the effective reduction of the final processing cost. Coagulation/flocculation …
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Deep dewatering process of sludge by chemical conditioning
Activated sludge process has been widely applied in wastewater treatment plants (Ma et al. 2016; Pronk et al. 2015).However, the disposal of excess sludge has become a rising challenge for wastewater treatment plants (WWTPs) due to high sludge production (Dong et al. 2012).As the concentrated product of contaminants from sewage, …
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Enhanced technology based for sewage sludge deep
An in-depth evaluation of sludge deep-dewatering technology. Enhanced technology is one of the most important components in the sludge deep-dewatering process and the efficiency of enhanced dewatering will directly affect sludge treatment costs, reduction and subsequent disposal. In addition, the selection of enhanced technology …
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Relationship between flocculation of activated sludge and
A better understanding and description of the biological flocculation process is necessary in order to establish more efficient operational strategies. The main aim of this study was to get a comprehensive and unique insight into the floc properties of activated sludge and to assess the relative impact of chemical and physical parameters.
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Flocculation of sewage sludge with FeCl3
Half of the SS was re-suspended and flocculated with FeCl 3 at a rate of 40 g Fe kg −1 SS d.w. to simulate flocculation as performed in sewage treatment plants. Throughout the whole text we refer to this process as FeCl 3 chemical conditioning of water for sludge production (shortly FeCl 3 treatment). For the clarity of the manuscript both …
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Polymer Flocculants | SpringerLink
The water content of sludge cake after dewatering treatment is usually ca. 80 %, and the volume of sludge can be reduced to 1/10 the original volume of sludge. Polymer flocculants which are capable of reducing water content of sludge more than before are strongly requested in the treatment of dewatering sludge because of cost …
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Improvement of sludge dewaterability by energy
Sewage sludge is an inevitable by-product of biological wastewater treatment and contains various toxic substances, such as pathogens, heavy metals, …
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Using FBRM to investigate the sewage sludge flocculation
Polyelectrolyte flocculation is a commonly used method for sewage sludge conditioning. The rate and extent of water removal from the flocculated sludge depends on the properties of the ...
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The fate and impact of coagulants/flocculants in sludge treatment
Coagulants and flocculants have been widely used in various applications, especially in wastewater treatment and sludge dewatering, which result in their high accumulation in waste-activated sludge (WAS). In the past years, the fate and impact of …
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Interaction of polyelectrolyte with digested sewage sludge and …
Flocculation of sewage sludge with polyelectrolytes prior to dewatering is a commonly used method for enhancing sludge dewaterability. There are two widely accepted flocculation mechanisms: particle–particle bridging and surface charge neutralization [1], [2]. With the particle bridging mechanism, the polyelectrolyte chains adsorb on the ...
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(PDF) INFLUENCE OF FLOCCULATION ON SEWAGE SLUDGE …
The cationic polymer was added to the sludge, under stirring at 300 rpm for 20 s with a JAR TEST device. Then, the flocculated sludge was thickened by gravity drainage on a lab-scale device ...
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Understanding and optimization of the flocculation process in
The manuscript has been divided into two sections: factors that affect sludge flocculation, and the flocculation mitigation and control methods utilizing process parameters. 2. Factors influencing biological sludge flocculation. Biological sludge flocculation is a complex process that can be influenced by several different factors.
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Weijun ZHANG | Professor (Full) | PhD. | China University of
Traditional flocculation conditioning is unable to destroy EPS and ineffective to remove the bound water in WAS. ... Malodor is becoming the main secondary pollution in the municipal sewage sludge ...
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Sludge Dewatering
The mechanisms of polymer and polyelectrolyte effects in sludge conditioning have not been fully explained to date. With respect to sewage sludge, the flocculation effect is explained by the formation of the hydrogen and electrostatic bonds, less frequently ionic bonds, between their chains and the surface of sludge particles.
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The dewatering performance and cracking-flocculation
High water affinity of extracellular polymeric substances (EPS) and high compressibility of sewage sludge solids have negative impacts on sludge dewatering. In this study, a composite conditioner, Fe 2+ –activated sodium persulfate (denoted as Fe 2+ /SPS) combined with thermal–pretreated phosphogypsum (PG), was used to improve the …
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Improvements on activated sludge settling and …
The sludge settling and its flocculation affinity were improved through the complexation of flocs and released cation ions …
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The enhanced dewaterability of sludge by a starch-based
Coagulation/flocculation is one of the most widely used and cost-effective pretreatment methods for improving the dewaterability of sludge. In this study, a cationic …
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Composition analysis of fractions of extracellular polymeric
Biggs, C. A. & Lant, P. A. Activated sludge flocculation: On-line determination of floc size and the effect of shear. Water Res. ... Acidithiobacillus sp. applied to sewage sludge bioleaching ...
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Conditioning of sewage sludge via combined ultrasonication-flocculation
Conditioning of sewage sludge via combined ultrasonication-flocculation-skeleton building to improve sludge dewaterability Ultrason Sonochem. 2018 Jan;40 (Pt A):353 ... traditional cationic polyacrylamide (CPAM) was applied to reconstruct the sludge aggregates through flocculation, and rice husk (RH) was utilized to improve the …
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Conditioning of sewage sludge via combined ultrasonication …
During the combined US-CPAM-RH sludge conditioning, the sludge flocs were mildly disintegrated by ultrasonic cavitation, leading to an increase of protein …
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(PDF) Influence of flocculation on sewage sludge …
CONCLUSIONS For sludge thickening by gravity filtration, drainability index, including all the 3 most important parameters : concentration ratio (ability of sludge to be thickened), kinetics of water release and quality …
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