Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Oliveira, Cláudia Trindade; Rodrigues, Rafael Teixeira; Rubio, J.

doi:10.1002/clen.201300050

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Here, part of particles in back-washed water of all the runs was found to be aggregated. The particle aggregation in back-washed water may occur through aeroflocs mechanism due to air intrusion while shifting the operation mode from filtration to the back-washing (Oliveira et al 2014). Figure 10 shows the SS, turbidity, color, and Fe washout removal performances of Runs 1-10.…”

Section: Effect Of Back-washing On Kaolin Particle and Iron Washout Fmentioning

confidence: 99%

Effectiveness of active control of surface charge of filter media on separation of microparticles from contaminated wastewater

Ashadullah¹,

Kishimoto²

2018

Appl Water Sci

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Depth filtration is a conventional concept for the solid-liquid separation process through granular media, and this technique is very useful in removal of large-sized particle. However, in the case of microparticles smaller than the pore space it does not function well. Accordingly, an effective small particle removal technique is desired. In this research, a carbon fiber felt was introduced as filter media and ± 1.0 V terminal voltage was applied for activating the media to enhance in adsorbing as well as desorbing the fine particles in the filtration and back-washing. Kaolin particles in the range of 0.1-4.0 µm were used as a model of microparticles. The complete kaolin particle removal was observed in pure water, and it decreased to around 50% in the anionic surfactant-contaminated wastewater at the hydraulic loading of 283 L/m 2 /min. On the contrary, at the back-washing hydraulic loading of 1274 L/m 2 /min, the kaolin particle washout removal efficiency was found to be around 73% in pure water and it dramatically decreased and found within the range of 5-50% when the kaolin was in contact with anionic surfactant and wastewater. Although the kaolin particle washout removal rate was observed very low in wastewater, this technique would be very useful in enhancing the refreshment of the filter media for extending the production time of the filter.

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Section: Effect Of Back-washing On Kaolin Particle and Iron Washout Fmentioning

confidence: 99%

Effectiveness of active control of surface charge of filter media on separation of microparticles from contaminated wastewater

Ashadullah¹,

Kishimoto²

2018

Appl Water Sci

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“…In general, the main mechanism of coagulation is charge neutralisation and bridging of the oil micro-droplet flocs to produce macro-droplet flocs, which depends on the molecular charge and the charge density. Some of the polymers used for coagulation are of low molecular weight with high cationic charge density, for example, hydrolysed polyaluminium sulphate (PAS), polyacrylamide, melamine formaldehydes, polyamine, polyacrylamides (Zetag-FS/A50) and polydiallydimethyl ammonium chloride (polyDADMAC) (Zouboulis and Avranas, 2000;Bolto and Gregory, 2007;Li et al, 2008;Guan et al, 2014;Oliveira et al, 2014;Kweinor Tetteh et al, 2017). There has recently been extensive and ongoing work looking for an alternative coagulant for chemical treatment that is capable of meeting more stringent treatment standards.…”

mentioning

confidence: 99%

“…As part of this study, a field study on a local South Africa wastewater treatment process was conducted and an expert consulted at a local water treatment plant reported, based on experience, that Zetag-FS/A50 has super-surfactant merits when applied in treating industrial wastewater. However, it has some drawbacks for the environment when attention is not paid to over-or under-dosage, such as (a) re-dispersion of impurities, (b) increase in sludge formation and (c) high turbidity (Bolto and Gregory, 2007;Guan et al, 2014;Oliveira et al, 2014). It is therefore important to pay attention to the coagulant dosage throughout the treatment process.…”

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confidence: 99%

Effects of a polymeric organic coagulant for industrial mineral oil wastewater treatment using response surface methodology (RSM)

Tetteh

Rathilal

2018

WSA

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In this study, treatment of a local South African oil refinery effluent using a coagulation flotation process is designed using response surface methodology (RSM). A Box-Behnken design (BBD) implementing the RSM is applied to evaluate the effects and interactions of three operating parameters, viz., pH, coagulant dosage and flotation time, on the treatment of mineral oil wastewater (MOW). Polyacrylamide (Zetag-FS/A50), which is a water-soluble compound, is applied to enhance the adsorption mechanism and intermolecular bridging to minimise the amount of oil droplets. In addition, due to the monomeric nature and the charge density of the Zetag-FS/A50, its efficiency was evaluated to serve as an alternative coagulant for the pretreatment of the MOW. The removal of chemical oxidation demand (COD), soap oil and grease (SOG), total suspended solids (TSS) and turbidity from the MOW were used as the response variables for the coagulation flotation process. This was done with a standard dissolved air flotation jar test. The results show that the actual COD, SOG, TSS and turbidity percentage removal at optimised conditions with a coagulant dosage of 50 mg/L were 82%, 83%,70% and 83% respectively, while the predicted response was 92%, 96%, 73% and 87% for COD, SOG, TSS and turbidity, respectively. The analysis of variance (ANOVA) showed that the proposed models are significant at a 95% confidence level. A quadratic model was generated for response variables COD and SOG, while TSS and turbidity produced a linear model. The models fitted well with the experimental data with correlation coefficients (actual R2) of 0.94 for COD, 0.91 for SOG, 0.81 for TSS, and 0.75 for turbidity.The outcome of the study shows that the RSM has merit to optimise and identify the most important factor to control and the Zetag-FS/A50 coagulant has the potential to adsorb the oil droplets in order to enhance the treatment efficiency of the process.

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A Review on Floc-Flotation of Fine Particles: Technological Aspects, Mechanisms, and Future Perspectives

Asgari

Khoshdast

Nakhaei

et al. 2023

Mineral Processing and Extractive Metallurgy Review

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Operating Parameters Affecting the Formation of Kaolin Aerated Flocs in Water and Wastewater Treatment

Cited by 4 publications

References 25 publications

Effectiveness of active control of surface charge of filter media on separation of microparticles from contaminated wastewater

Effectiveness of active control of surface charge of filter media on separation of microparticles from contaminated wastewater

Effects of a polymeric organic coagulant for industrial mineral oil wastewater treatment using response surface methodology (RSM)

A Review on Floc-Flotation of Fine Particles: Technological Aspects, Mechanisms, and Future Perspectives

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