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The effects of combined calcium peroxide (CaO 2) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this study.The evolutions of extracellular polymeric substances (EPS) distribution, composition and morphological properties were analyzed to unravel …
The FBRM kinetic curves for all of the polymers from Fig. 2 showed very similar qualitative behaviour to that in Panel A of Fig. 1. The number of counts was stable during the initial and final 2 min of the FBRM experiment. ... Studies on flocculation and dewatering of kaolin suspensions by anionic polyacrylamide flocculant in the presence of ...
It is reported that using chemical and mechanical dewatering such as flocculation followed by filtration of coal tailings can generate dry solid tailings and filtrate water for recycling and reuse meeting the requirement of coal washing processes [6]. ... Dewatering behavior and regulation mechanism of montmorillonite nanosheet in …
Flocculation of −75 µm coal fines in coal slurry is achieved using nonionic Nalco-83370 + flocculant [ 40 ]. The flocculation performance results in a maximum settling rate of 0.3222 cm/s with a turbidity reduction ratio of …
The effect of CPAM on dewatering and flocculation in dredged sludge. The dehydration effect of CPAM could be evaluated based on the moisture content, SRF, CST, and SV (30). ... The particle size distribution of dredged sludge played a crucial role in dewatering performance. The behavior of sludge particles during the dewatering …
Surface charge of solids in sludge is known to play a determinant role in the interactions between particles, which influences the dewatering performances [6]. Then, various origins of sludge will result in variable properties and behavior in flocculation / separation processes.
Flocculation of cellulose nanofibrils (CNF) was induced by charge neutralization with different types and concentrations of salt, and its effects on the network strength and dewatering ability of the CNF suspension were investigated. Aggregation of the CNF suspension was evaluated by measurement of light transmission using …
Sludge disposal is an integral part of wastewater treatment systems, and its cost usually accounts for more than half of the total operation cost. Sludge disposal technology is facing challenges and opportunities simultaneously and can still be improved. Sludge dewatering is an essential process in sludge disposal, and it is important for the …
Jie Ren, Aimin Li, Hu Yang Add to Mendeley https://doi/10.1016/j.watres.2018.07.029 Get rights and content • Characteristics of …
Flocculant played an important role in water treatment and sludge dewatering. It is imperative to design and synthesize an eco-friendly and biodegradable flocculant based on natural polymer. In the present work, a new amphoteric CMC-based flocculant, CMC-g-PDMC was synthesized via grafting DMC onto hydroxyl of CMC …
The horizontal type utilizes paddle-style mixers while the vertical style mixers can include paddle, turbine, and propeller style mixers. The shape and size of a flocculation basin is determined by the type of mixing used and the adjacent structures such as the sedimentation basins. Flocculation basins are usually split into 3 …
Sludge disposal is an integral part of wastewater treatment systems, and its cost usually accounts for more than half of the total operation cost. Sludge disposal technology is facing challenges and opportunities simultaneously and can still be improved. Sludge dewatering is an essential process in …
2.2 Flocculant Types. Generally, it is considered that flocculant types have important influence in achieving effective tailings flocculation (Slatter and Seddon, 2015), as the rheological behaviour of the materials and the structural rebuild of the polymeric agglomerates are significantly affected by the flocculants, which is classified into three …
The effects of typical sludge properties (solids concentration, soluble extracellular polymeric substances (SEPS) and alkalinity) on waste activated sludge flocculation-dewatering …
This study systematically investigated the flocculation-dewatering behavior and related mechanisms of waste activated sludge at complex sludge properties …
Flocculation conditioning is a common pretreatment step for dredged sludge dewatering, while various pollutants in sludge might release into the residual water during flocculation conditioning and ...
This work discusses the flocculation and dewatering performance of Kaolin slurry treated using single- and dual-polymer flocculants. Under single-dose conditions, the adsorption bridging of polymeric flocculants (caused by hydrogen bonds) exerts a more significant effect than electrical neutralization on forming large flocs.
The nature of the anionic PAM versus nonionic PEO in the adsorption and flocculation behaviour plays a pivotal role in particle interactions, network structure and strength. ... particle interactions and dewatering behaviour has been found to be strongly dependent on the polymer structure type. While both polymers have a common alkyl …
Characterization and coagulation behavior of polymeric aluminum ferric silicate for high-concentration oily wastewater treatment. Chem. Eng. Res. Des., 119 (2017), pp. 23-32. ... Flocculation-dewatering behavior of waste activated sludge particles under chemical conditioning with inorganic polymer flocculant: Effects of typical sludge properties.
The effects of combined calcium peroxide (CaO2) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this ...
DOI: 10.1016/j.chemosphere.2023.138445 Corpus ID: 257703815; Flocculation and dewatering of the Kaolin slurry treated by single- and dual-polymer flocculants. @article{Xu2023FlocculationAD, title={Flocculation and dewatering of the Kaolin slurry treated by single- and dual-polymer flocculants.}, author={Shanlin Xu and …
Laboratory aerobic digestion studies were conducted to determine the effect of divalent cations on the characteristics of aerobically digested activated sludge. Separate reactors were operated at two divalent cation concentrations. Characteristics examined included dewatering properties (cake solids, specific resistance to filtration, and capillary …
The flocculation rate (group 2 vs group 4) is however highest for the sample with lowest CC/SSC (group 2). There are two reasons for this behavior: 1) algae do not aggregate at low concentration (see Fig. 2); 2) high SSC lead to high collision frequency, so the flocculation is fastest when SSC is high. The SSC of group 2 is 10 times larger than ...
Good flocculation performance and dewatering behavior was achieved at 500 g flocculant/ton kaolinite, which gives adsorption densities well below saturation coverage. Hydrodynamic diameter and solution viscosity of both polymers decreased with increasing temperature, consistent with a reduced polymer–solvent interactions and a …
The effects of typical sludge properties (solids concentration, soluble extracellular polymeric substances (SEPS) and alkalinity) on waste activated sludge flocculation-dewatering behavior and mechanisms under chemical conditioning with inorganic polymer flocculant-polyaluminum chloride (PACl) were systematically examined in this study.
The investigation of the specific behavior of a cationic block structure and its excellent flocculation performance in high-turbidity water treatment. ... Synthesis of a cationic polyacrylamide by a photocatalytic surface-initiated method and evaluation of its flocculation and dewatering performance: nano-TiO 2 as a photo initiator. RSC ...
The flocculation of smectite pulps with anionic PAM, on the other hand, produced slightly greater sediment compaction behaviour (∼ 27 wt.% solid) than PEO (24 wt.% solid). Upon shear of the pre-sedimented pulps by agitation at 100 rpm for 10 min however, the consolidation of PEO-flocculated pulp increased dramatically with …
This study proposes a new method using the combination of flocculation and prefabricated horizontal drain (PHD) assisted with vacuum pressure for rapid dewatering of high-water-content dredged slurry. First, to demonstrate the superiority of using PHD over the more commonly used prefabricated vertical drain (PVD), experiments were conducted …
The effects of combined calcium peroxide (CaO2) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this study. The evolutions of extracellular polymeric substances (EPS) distribution, composition and morpholo …
DOI: 10.1016/J.CEJ.2011.07.034 Corpus ID: 95279015; Studies on the effect of flocculant adsorption on the dewatering of iron ore tailings @article{Dash2011StudiesOT, title={Studies on the effect of flocculant adsorption on the dewatering of iron ore tailings}, author={Monika Dash and R. K. Dwari and S. K. Biswal and P. Sita Rama Reddy and …
The effect of shear on dewatering behaviour and particle interactions of Na-exchanged smectite and kaolinite clay dispersions has been investigated at pH 7.5, using hydrolysable Ca(II) and Mn(II) ions as coagulants and high molecular weight anionic and non-ionic polyacrylamide (PAM A and PAM N, respectively) and polyethylene oxide …
Mpofu, P., Addai-Mensah, J. & Ralston, J. Temperature influence of nonionic polyethylene oxide and anionic polyacrylamide on flocculation and dewatering behavior of kaolinite dispersions. J ...
The process of sludge dewatering, shown in Fig. 4, is closely related to the formation of sludge cake in water. Sludge cake is formed by the aggregation of flocs in raw water, which consists of various colloidal solids, including EPS. Floc properties affect the characteristics of sludge cake and dewatering performance.
An improved dewatering system for activated sludge by scaffolding and flocculants was designed to provide a guide to practical engineering. Funding Statement This work was …
Upon flocculation, primary dewatering results from the free and hindered settling of flocs, which occurs in the upper half of the thickener. The settling behaviour is usually improved through pH control, chemical additive polymeric flocculant selection, and solution speciation [1].
Flocculation is usually a necessary pretreatment step in dewatering streams containing significant quantities of very fine particles (e.g., <5 μm). For such systems, the effectiveness of the flocculation step may determine the performance and, …
Flocculation-dewatering behavior of microalgae at different growth stages under inorganic polymeric flocculant treatment: the relationships between algal organic matter and floc dewaterability. ACS Sustain. Chem. Eng., 6 (8) (2018), pp. 11087-11096, 10.1021/acssuschemeng.8b02551.
Under optimum orthokinetic con- dewatering behavior of kaolinite dispersions, Journal of Colloid and Interface Science 261 (2) (2003) 349 – 359. ditions of agitation intensity and duration, better floccu- [9] L. Besra, et al., Flocculation and dewatering of kaolin suspensions in lation performance and moderate enhancement of the presence of ...
This paper reports the result of studies on flocculation and dewatering of kaolin suspensions by cationic polyacrylamide (PAM-C) flocculants in presence of surfactants.The surfactants used were namely anionic sodium dodecyl sulphate (SDS), cationic cetyl trimethyl ammonium bromide (CTAB) and non-ionic TritonX 100, which is a …
