Ferric Chloride and Lime conditioning of activated sludges: An electron microscopic study on resin-embedded samples

Deneux-Mustin, S; Lartiges, Bruno; Villemin, G.; Thomas, F.; Yvon, Jacques; Bersillon, Jean-Luc; Snidaro, D.

doi:10.1016/s0043-1354(01)00003-3

Cited by 64 publications

(34 citation statements)

References 24 publications

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“…FeCl 3 sludge. The skeleton building was enhanced by the presence of phosphorus element (P) [25], while P concentration is relatively high in our sludge, 2.9 % wt (shown in Table 1). Results of this experiment show that the order of coagulants strength under HT was not different from that of under no HT [4], while their outcomes were notably increased (described in ''Comparison of the effect of hydrothermal treatment, inorganic coagulant addition, and their combination in reducing moisture content of sludge cake'').…”

Section: Effect Of Inorganic Coagulant Addition Under Hydrothermal Trmentioning

confidence: 78%

“…Meanwhile, the coagulation and compaction effects might be less under the additions of divalent cation coagulants [4] and, moreover, monovalent cation coagulant. Skeleton building over the particle surface by Fe precipitate, reported in some FeCl 3 treated sludge works [25,26], might also increase the effectiveness of pressurizing process on HT ? FeCl 3 sludge.…”

Section: Effect Of Inorganic Coagulant Addition Under Hydrothermal Trmentioning

confidence: 99%

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Effect of inorganic coagulant addition under hydrothermal treatment on the dewatering performance of excess sludge with various dewatering conditions

Yan

Prabowo

et al. 2016

J Mater Cycles Waste Manag

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A study for producing low moisture content sludge cake was performed by adding NaCl, CaCl 2 , Ca(OH) 2 , or FeCl 3 to excess sewage sludge under hydrothermal treatment (HT) and varying dewatering conditions from low to high pressure (0.04-12 MPa). FeCl 3 addition under HT resulted in cakes with significantly lower moisture content than HT cakes, and moreover, than raw sludge cakes, under all dewatering conditions. The addition of CaCl 2 produced similar effects to FeCl 3 addition but at weaker extents. The addition of Ca(OH) 2 produced much weaker effect than the addition of CaCl 2 under the low-pressure dewatering. However, the effects were comparable under the medium-and highpressure dewatering. The effect of NaCl addition was only prominent under the high-pressure dewatering. Comparison on the moisture content of sludge cakes with the treatments of HT, coagulant-added, and their combination showed that synergy between HT and coagulant addition in producing low moisture content sludge cake was evidenced.

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Section: Effect Of Inorganic Coagulant Addition Under Hydrothermal Trmentioning

confidence: 78%

Section: Effect Of Inorganic Coagulant Addition Under Hydrothermal Trmentioning

confidence: 99%

Effect of inorganic coagulant addition under hydrothermal treatment on the dewatering performance of excess sludge with various dewatering conditions

Yan

Prabowo

et al. 2016

J Mater Cycles Waste Manag

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“…4g) also partly enhanced, but flocculation and aggregation phenomenon appeared clearly and the uniformity of sludge particle size was poor. Deneux-Mustin et al (2001) reported that the dewaterability of sewage sludge was determined by its particle size and structure. Larger particle size and denser structure favored the improvement of sludge dewaterability, which was in accordance with the present study.…”

Section: Improvement Of Sewage Sludge Dewaterabilitymentioning

confidence: 99%

Simultaneous heavy metals removal and municipal sewage sludge dewaterability improvement in bioleaching processes by various inoculums

Shi

Zhu

Shang

et al. 2015

World J Microbiol Biotechnol

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The heavy metals content and dewaterability of municipal sewage sludge (MSS) are important parameters affecting its subsequent disposal and land application. Six kinds of inoculums were prepared to examine the characteristics of heavy metals removal and MSS dewaterability improvement in bioleaching processes. The results showed that Cu, Zn and Cd bioleaching efficiencies (12 days) were 81-91, 87-93 and 81-89%, respectively, which were significantly higher than those of Fe-S control (P < 0.05) and blank control (P < 0.01). The bioleaching boosted by the prepared inoculums could also significantly enhance MSS dewaterability (P < 0.01). The centrifugal dehydration efficiency of MSS rose from 73.00 to 90.00% at day 12. Microscopic observations and energy dispersive spectrum analysis demonstrated that the dewaterability improvement might be attributed to the changes of sludge structure from flocculent to obvious granular and the formation of secondary minerals mainly consisting of iron, oxygen and sulfur elements. The results above demonstrated that bacterial consortium enriched from acid mine drainage (AMD) was suitable to boost sludge bioleaching for heavy metals removal and dewaterability improvement. It also suggested that the synergy of sulfur/ferrous-oxidizing bacteria (SFOB) enriched from AMD and the cooperation of exogenous and indigenous SFOB significantly promoted bioleaching efficiencies.

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“…The detail was described by Kawaharasaki et al [24] and Serafim et al [25] . SEM (HITACHI S-3000N) and TEM (HITACHI H-7500) were preformed according to protocols described by DeneusMustin et al [26] .…”

Section: Microscopic Observationmentioning

confidence: 99%

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

Liu

2009

Chin. Sci. Bull.

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Polyhydroxybutyrate (PHB) was produced by activated sludge in a two-stage process. In the first stage, the sludge with high storage potential was enriched in a sequencing batch reactor (SBR) operated by a dynamic feeding regime. The biosynthesis of PHB was sequentially accomplished in a batch reactor in the second stage. This article focused on the optimization of PHB content by evaluating the effects of three critical factors: Dissolved oxygen, pH and food-to-microorganism (F/M) ratio in the batch reactor. The results showed that the rate of substrate uptake, as well as the yield and content of PHB increased with the increase of dissolved oxygen concentration. The control of pH was not necessary under the weak alkaline condition for improvement of PHB content, except for the case in which the pH value was out of rang of 7.0 to 10.0. The enhanced F/M ratio favored PHB accumulation in the range of 1.0 to 4.5 C-mmol/C-mmol and the highest PHB content, 64%, was achieved at 4.5 C-mmol/C-mmol. When F/M ratio was enhanced to 6.0 C-mmol/C-mmol, the phenomenon of utilizing simultaneously intracellular PHB and external substrate by sludge was observed, which resulted in a sharp decrease of PHB content. The microscopic observation clearly confirmed that dynamic feeding regime was effective for selecting and enriching the sludge with a high storage potential.polyhydroxybutyrate, activated sludge, dynamic feeding regime, optimum operating conditions Conventional plastics have faced some severe problems, because of their persistency in the environment and non-biodegradability. Therefore, the biodegradable plastic has potentials in applications. Polyhydroxyalkanoates (PHAs) are the polyester of hydroxyalkanoates synthesized by numerous bacteria as intracellular carbon and energy storage compounds, and have similar mechanical properties to conventional plastics like polypropylene or polyethylene. Additionally, PHAs have the attractive features of being completely biodegradable, biocompatible, and produced from renewable sources. Polyhydroxybutyrate (PHB) is the most common and best characterized PHAs. For the economical production of PHAs, various bacterial strains, either wild-type or recombinant, and new fermentation strategies were developed with high content and productivity of PHAs [1,2]

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Ferric Chloride and Lime conditioning of activated sludges: An electron microscopic study on resin-embedded samples

Cited by 64 publications

References 24 publications

Effect of inorganic coagulant addition under hydrothermal treatment on the dewatering performance of excess sludge with various dewatering conditions

Effect of inorganic coagulant addition under hydrothermal treatment on the dewatering performance of excess sludge with various dewatering conditions

Simultaneous heavy metals removal and municipal sewage sludge dewaterability improvement in bioleaching processes by various inoculums

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

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