A novel eductor-based MBR for the treatment of domestic wastewater

Mitra, Shibam; Daltrophe, N.; Gilron, Jack

doi:10.1016/j.watres.2016.04.057

Cited by 23 publications

(8 citation statements)

References 37 publications

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“…Fortunately, both PAEs and BPA were below detection limits (< LOD) in PMT-WWs, which may confirm that the onboard MBR systems are effective in removing these tested compounds. In the literature (Judd 2008; Karim and Mark 2017; Mitra et al 2016), however, the opinion regarding the effectiveness of MBR reactors in micropollutant removal varies, which is probably a result of the membrane system used in MBR (micro/ultrafiltration) and/or the compounds under consideration. Nevertheless, further research is required because knowledge on the fate of micropollutants generated by maritime transport is limited.…”

Section: Resultsmentioning

confidence: 99%

Landfill leachates and wastewater of maritime origin as possible sources of endocrine disruptors in municipal wastewater

Wilk

Fudala-Książek

Szopińska

et al. 2019

Environ Sci Pollut Res

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In this study, wastewater from municipal services, such as a port wastewater reception facility (PRF-WW) and a municipal solid waste plant (MSWP), was tested for the presence of the suspected endocrine-disrupting compounds phthalates (PAEs) and bisphenol A (BPA). PAEs and BPA were found in this study in high concentrations in raw wastewater obtained from passenger ships (RMT-WWs) (up to 738 μg/L and 957 μg/L, respectively) collected in the Port of Gdynia and in landfill leachates (LLs) (up to 536 μg/L and up to 2202 μg/L, respectively) from a MSWP located near Gdynia. In particular, the presence of reprotoxic di(2-ethylhexyl) phthalate (DEHP, up to 536 μg/L in LLs and up to 738 μg/L in RMT-WWs) requires further action because if this compound, as well as other PAEs and BPA, is not degraded by activated sludge microorganisms, it may reach receiving waters and adversely impact aquatic organisms. Therefore, PAEs and BPA should be removed either during the onsite pretreatment of tested industrial wastewater or during tertiary treatment at municipal wastewater treatment plants (WWTPs, representing end-of-pipe technology). Graphical abstract Electronic supplementary material The online version of this article (10.1007/s11356-019-05566-4) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Landfill leachates and wastewater of maritime origin as possible sources of endocrine disruptors in municipal wastewater

Wilk

Fudala-Książek

Szopińska

et al. 2019

Environ Sci Pollut Res

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“…Being as an aeration device, it can increase the concentration of dissolved oxygen in the water to promote the growth of fish and plants, and has been successfully applied to fish farming (Akhtar et al, 2018) and agriculture production (Bagatur, 2014;Dahrazma et al, 2019). With the ability of supplying a large number of fine bubbles, Venturi bubble generator has a good prospect in waste water treatment (Mitra et al, 2016;Kaya et al, 2017), mineral flotation (Ahmadi et al, 2014;Reis and Barrozo, 2016), ship drag reduction (Kawamura et al, 2004;Hashim et al, 2015), and bioreactors (Krusong et al, 2015;Kayaalp and Ozturkmen, 2016).…”

Section: Bubble Generation Methodsmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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“…The pumping efficiency of an ejector is evaluated using the entrainment ratio (ER) of the ejector. The ER is the proportion of mass flow rate, _ m, of the secondary stream to that of the primary stream, that is ER ¼ _ m secondary _ m primary (2) Given that the primary stream Mach number (mass flow rate) is controlled in this work, any change in the ER is due to a change in the secondary mass flow rate, thus a change in ER can be seen as a decrease in pumping efficiency.…”

Section: Performance Evaluation Criteriamentioning

confidence: 99%

An experimental investigation of the use of an outlet silencer to quiet ejectors

Desmarais

Rocha

2020

International Journal of Aeroacoustics

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Ejectors are simple fluid movers and mixers used in a range of industries; however, the attractiveness of their simplicity can be offset by high levels of noise generation. This work experimentally investigates the use of a silencer affixed to the outlet of a subsonic air–air ejector as a means of quieting the ejector. An emphasis is placed on finding a silencer design which has a minimal impact on the mass flow rate exhausting from the ejector (pumping performance). This paper discusses the results of 10 different silencer designs, tested in an attempt to further understand noise generation mechanisms and to find a practical method to reduce the noise of ejectors. It is found that the placement of a perforated cone at the mid-length of the silencer is the only solution tested which provides a significant acoustic advantage with only a small drop in pumping performance. Other solutions tested provide either no acoustic advantage or have too great of a reduction in pumping performance. It is found that the size and shape of the ejector can be designed in such a way to reduce the overlap of natural modes and thus the overall noise levels of the ejector caused by high levels of resonance. The use of acoustic foam to dampen acoustic natural modes proves that the natural modes of the ejector are a significant contributor to the overall noise levels.

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A novel eductor-based MBR for the treatment of domestic wastewater

Cited by 23 publications

References 37 publications

Landfill leachates and wastewater of maritime origin as possible sources of endocrine disruptors in municipal wastewater

Landfill leachates and wastewater of maritime origin as possible sources of endocrine disruptors in municipal wastewater

A review on bubble generation and transportation in Venturi-type bubble generators

An experimental investigation of the use of an outlet silencer to quiet ejectors

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