Effective treatment of emulsified oil wastewater by the coagulation–flotation process

You, Zhaoyang; Xu, Haiyang; Zhang, Shujuan; Zhang, Li

doi:10.1039/c8ra06565a

Cited by 52 publications

(20 citation statements)

References 42 publications

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“…For this purpose, coagulation-DAF (pre-treatment) was compared with DAF-coagulation (post treatment), by investigating four different types of coagulants (Z553D, Zetag-FS/A50, FS, and alum). Similarly, introducing the saturated air into the flotation cell generated microbubbles, which was the driving force of the agglomerated oil droplet flocs [7,9]. At a saturation pressure of 400 kPa, the released of the dissolved air into the flotation zone resulted in the oil droplets being entrapped by the microbubbles [7].…”

Section: Daf Performancementioning

confidence: 99%

“…Similarly, introducing the saturated air into the flotation cell generated microbubbles, which was the driving force of the agglomerated oil droplet flocs [7,9]. At a saturation pressure of 400 kPa, the released of the dissolved air into the flotation zone resulted in the oil droplets being entrapped by the microbubbles [7]. This increased the buoyance force and the velocity of the flocs to the top surface, leaving the water below clear [17,19].…”

Section: Daf Performancementioning

confidence: 99%

“…In South Africa, the concern about the environmental threats of oily waste pollution produced during oil exploration and production activities impedes the united nations (UN's) sustainable goal for 2050, with a focus on clean water and sanitation [5,6]. It is therefore important to improve the treatment process to meet the stringent discharge limits of soap oil and grease (SOG) below discharge limits of 50 mg/L [7,8]. Some of the waste streams, including petrochemical industries, contain high amounts of contaminants viz.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the waste streams, including petrochemical industries, contain high amounts of contaminants viz. turbidity, total suspended solids (TSS), chemical oxygen demand (COD), SOG and other organic compounds' derivatives [7,9,10]. These contaminants are not just detrimental to the environment, but also to aquatic life and human health [8].…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Pre- and Post-Coagulation Configuration of Dissolved Air Flotation Using Response Surface Methodology

Tetteh

Rathilal

2020

Processes

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The effects of coagulation-dissolved air flotation (DAF) process configuration was studied on oil refinery wastewater. The configuration was done in two ways: acid-coagulation-DAF (pre-treatment) and acid-DAF-coagulation (post-treatment). Two different cationic and polymeric organic coagulants were employed in this study to compare their treatability performance with the two aforementioned configurations. All the coagulants applied before the DAF were found to be effective, with over 85% more contaminant removal efficiency than their post-treatment. Alum, being the most cost-effective coagulant, was then employed with response surface methodology (RSM) to obtain the optimum conditions. These include a coagulant dosage of 100 mg/L, air saturator pressure of 375 kPa and air–water ratio of 10% vol/vol corresponding to a desirability of 92% for the removal of oily pollutants from a local South Africa oil refinery’s wastewater. With the response quadratic models that were developed, the optimum conditions were tested experimentally, which were consistent with the models predicted results at a 95% confidence level.

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Section: Daf Performancementioning

confidence: 99%

Section: Daf Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluating Pre- and Post-Coagulation Configuration of Dissolved Air Flotation Using Response Surface Methodology

Tetteh

Rathilal

2020

Processes

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“…Although hyperbranched polymers have been studied extensively for demulsification, their use still faces many problems such as the need for large dosages, and high operating temperature, and their complex synthesis process . In addition, most of these polymer demulsifiers are used in diesel‐in‐water emulsions, and there have been few reports for the treatment of oily wastewater.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Zhang

Shen

et al. 2020

ChemistrySelect

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In the present study, a hyperbranched polymer demulsifier (PPDA) was synthesized by an improved “one‐pot” method with 1,4‐phenylene diamine as the central core, and ethylenediamine and methyl acrylate as the chain segments. NMR and Fourier transform infrared spectroscopy were used to confirm the molecular structure of the demulsifier, and thermogravimetric analysis was carried out to estimate its thermal stability. The effects of some important experimental parameters such as concentration, temperature and settling time on the demulsification performance were systematically studied. The results demonstrated that the light transmittance and oil removal ratio of oily wastewater reached to 47.9 % and 93.62 %, respectively, after demulsification with 20 mg.L−1 PPDA for 30 min at room temperature. With the same concentration and time at 60 °C, the light transmittance and oil removal ratio reached 57.0 % and 96.35 %, respectively. In addition, PPDA showed high salt tolerance over 10000 mg.L−1. The possible demulsification mechanism was examined by comparing the demulsification performance of different demulsifiers in diesel emulsion and oily wastewater, respectively. Furthermore, surface tension, interfacial tension, zeta potential and micrograph measurements provided convincing evidence for the possible demulsification mechanism. The surface tension reduction was 29.86 and 31.75 mN.m−1 at 25 °C and 60 °C, respectively. The corresponding critical micelle concentration was 4.17×10−7 and 5.50×10−7 mol.L−1, respectively. Additionally, the interfacial tension decreased from 15.70 to 6.96 mN.m−1 as the PPDA concentration increased from 20 mol. L−1 to 100 mol. L−1. This showed that PPDA easily absorbed at the interface and rapidly permeate into the interface film and then to broke the oil droplets. This work provides a new hyperbranched polymer demulsifier for the treatment of oily wastewater and is beneficial for understanding the demulsification mechanism.

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Advances in Coagulation Technique for COD Removal of Petroleum Wastewater—A Review

Moremada,

Kalpage

2023

Lecture Notes in Civil Engineering

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Effective treatment of emulsified oil wastewater by the coagulation–flotation process

Abstract: Ship emulsified oil wastewater was used as the research object in this study.

Cited by 52 publications

References 42 publications

Evaluating Pre- and Post-Coagulation Configuration of Dissolved Air Flotation Using Response Surface Methodology

Evaluating Pre- and Post-Coagulation Configuration of Dissolved Air Flotation Using Response Surface Methodology

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Advances in Coagulation Technique for COD Removal of Petroleum Wastewater—A Review

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