Coagulation of Particles Through Rapid Mixing

Sheng, Wen-Yan; Peng, Xiaofeng; Lee, D. J.; Su, Ay

doi:10.1080/07373930600840377

Cited by 17 publications

(5 citation statements)

References 34 publications

(31 reference statements)

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“…Many researchers used standard jar test by Phipps & Bird (Sheng et al, 2006;Park et al, 2006;Lee et al, 1994;Kan et al, 2002;Young et al 2000) to conduct the experiments. In this study, the same standard jar test as shown in Figure 4.1 had been built as follow:…”

Section: Methodsmentioning

confidence: 99%

Optimal Precipitation Of Zn+₂ and Ni+₂ From Aqueous Solution: Influence Of Rapid Mixing Parameters

Hmood¹

2021

Preprint

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Wastewater containing Zn+₂and Ni+₂is normally treated by chemical precipitation, coagulation, flocculation followed by clarification.The metal precipitation is influenced by chemical (wastewater pH, coagulant type and dose) and physical (rapid mixing speed and time) parameters. The process usually consists of the rapid dispersal of a coagulant into the wastewater followed by an intense agitation commonly defined as rapid mixing. This study focused on the most important parameters of rapid mixing design: mixing intensity and duration. Simulated aqueous solutions containing 50 ppm Zn+₂and 50 ppm Ni+₂were treated with aluminum sulphate, ferrous sulphate and ferric chloride coagulants at different doses and different rapid mixing times and speeds. Experimental results obtained indicate that ferric chloride at 30 mg/l dose was superior over aluminum sulphate and ferrous sulphate at the same dose in Zn+₂and Ni+₂removals. Rapid mixing time had a strong influence on the metal removal. An optimal combination of rapid mixing parameters was determined as: 60 s at 100 rpm for Zn+₂and 30 s at 80 rpm for Ni+₂removals. Scanning electron microscopy images for Zn+₂and Ni+₂flocs at optimum parameters of rapid mixing show that ferric chloride addition compacts the surface texture of the metals flocs. Flocs formed by Zn+₂are denser and larger than flocs formed by Ni+₂.

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Section: Methodsmentioning

confidence: 99%

Optimal Precipitation Of Zn+₂ and Ni+₂ From Aqueous Solution: Influence Of Rapid Mixing Parameters

Hmood¹

2021

Preprint

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“…Also, adding lower coagulant dose to wastewater led to minimum COD removal at rapid mixing range (150-250 rpm). It was noted that POFC dose and the fast speed are the detrimental factors for optimizing coagulation treatment of wastewater, where POFC dose enhances sorption and fl ocs development and also fast mixing of highly turbid wastewater disperses the coagulant and improves collision of particle velocity (Kan et al, 2002;Sheng et al, 2006). Kan et al, 2002 investigated the fast mixing speed infl uence on turbidity removal with initial 380 NTU using polyaluminum chlorides (PACl).…”

Section: Influence Of Dose and Rapid Mixing Speed On Turbidity And Co...mentioning

confidence: 99%

Response Surface Methodology for Treatment of Paper Mill Wastewater by Using Inorganic Polymeric Coagulant

Ali¹,

Moniem²,

Abdelsalam³

et al. 2022

Ecol. Eng. Environ. Technol.

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Inorganic polymeric ferric chloride (POFC) coagulant with proposed structure of Fe n (Cl 2.2 OH 0.8 ) n is synthesized using waste materials and characterized by XRD. In the current work scrutinized efficiency of POFC for paper mill wastewater (PMW) treatment using response surface methodology (RSM) with central Composite Design (CCD) modeling. Different factors; dose, rapid mixing speed, and rapid mixing time are used for optimize the coagulation process using POFC for treating PMW. The turbidity and chemical oxygen demand (COD) removals are the indicators for assessing POFC efficiency. The obtained result for XRD confirms the production of new material of inorganic polymeric coagulants. Based on RSM modelling, there is a high correlation between the experimental and predicated removals of turbidity and COD. Subsequently, the model is significantly applied for predicating COD and turbidity removals at different operation condition. Conclusively, the obtained results proposed for practical application of POFC coagulant for treatment of paper mill wastewater for COD and turbidity elimination. Furthermore, the applied RSM with CCD is talented model for optimizing treatment of PMW.

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“…Prior to thermal drying, most sludge moisture is removed via mechanical approaches (Arlabosse and Chitu, 2007;Chen et al, 2006a,b;Hwang et al, 2006;Islam et al, 2007;Kung, 2006;Lee et al, 2007a,b;Novak, 2006;Otawara and Kitamura, 2006;Seginer and Bux, 2006;Seginer et al, 2007;Sheng et al, 2006;Tien and Ramarao, 2006;Vaxelaire and Olivier, 2006). Thermal drying is frequently utilized following mechanical dewatering to remove substantial amounts of moisture from sludge.…”

Section: Introductionmentioning

confidence: 98%