Urban wastewater treatment using vermi-biofiltration system

Tomar, Priyanka; Suthar, Surindra

doi:10.1016/j.desal.2011.09.007

Cited by 85 publications

(30 citation statements)

References 28 publications

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“…That our results (based only on electromagnetic propagation of cosmic rays in the Galactic field, i.e. physics much more certain to hold up to the highest energies) are not consistent with this finding can be explained in two ways: either the composition of the northern hotspot is different from that produced by the typical cosmic-ray source; or new physics sets in at center-of-mass energies ∼ 50 TeV, as has been suggested for other reasons by several authors (e.g., Farrar & Allen 2013;Anchordoqui et al 2017;The Pierre Auger Collaboration et al 2017a;Tomar 2017;Pavlidou & Tomaras 2018).…”

Section: Implications For the Nature And Propagation Of Cosmic Raysmentioning

confidence: 90%

Magnetic Field Tomography in Two Clouds toward Ursa Major Using H i Fibers

Tritsis

Federrath

Pavlidou

2019

ApJ

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The atomic interstellar medium (ISM) is observed to be full of linear structures, referred to as "fibers". Fibers exhibit similar properties to linear structures found in molecular clouds, termed striations. Suggestive of a similar formation mechanism, both striations and fibers appear to be ordered, quasi-periodic and well-aligned with the magnetic field. The prevailing formation mechanism for striations involves the excitation of fast magnetosonic waves. Based on this theoretical model, and through a combination of velocity centroids and column density maps, Tritsis et al. (2018) developed a method for estimating the plane-of-sky (POS) magnetic field from molecular cloud striations. We apply this method in two HI clouds with fibers along the same line-of-sight (LOS) towards the ultra-highenergy cosmic-ray (UHECR) hotspot, at the boundaries of Ursa Major. For the cloud located closer to Earth, where Zeeman observations from the literature were also available, we find general agreement in the distributions of the LOS and POS components of the magnetic field. We find relatively large values for the total magnetic field (ranging from ∼10 to ∼20 µG) and an average projection angle with respect to the LOS of ∼ 50 • . For the cloud located further away, we find a large value for the POS component of the magnetic field of 15 +8 −3 µG. We discuss the potential of our new magnetic-field tomography method for large-scale application. We consider the implications of our findings on the accuracy of current reconstructions of the Galactic magnetic field and on the propagation of UHECR through the ISM.

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Section: Implications For the Nature And Propagation Of Cosmic Raysmentioning

confidence: 90%

Magnetic Field Tomography in Two Clouds toward Ursa Major Using H i Fibers

Tritsis

Federrath

Pavlidou

2019

ApJ

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“…Bio-vermifilter (BVF) is a land treatment process which has been widely developed and applied in the past decade. Pioneer bench-scale studies have confirmed the favourable performance of the system in relation to pollutants (Fang et al 2010;Tomar and Suthar 2011;Wang et al 2011a, b). Tolerant plants and soil media are used to treat wastewater efficiently at low-energy consumption.…”

Section: Introductionmentioning

confidence: 91%

Study of nitrogen removal performance in pilot-scale multi-stage vermi-biofilter: operating conditions impacts and nitrogen speciation transformation

et al. 2015

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The present work investigates pollutant removal and the transformation of nitrogen from sewage wastewater using a pilot-scale multi-stage bio-vermifilter system. Over a study period of 48 weeks, the pollutant removal performance of the system was measured and the effects of hydraulic loading rate (HLR) and dry-wet ratio (D/W) were estimated. The relationship between oxygen transfer rate and load of oxygen necessity was calculated and analysed for system optimisation. The method for diluting the isotope d 15 N-NO 3 -was applied to study nitrogen transfer. Moreover, statistical correlations were analysed to determine the crucial factors which influence nitrogen transfer efficiency. The system removes pollutants efficiently; specifically, the average removal efficiencies are 94.2 % for chemical oxygen demand (COD), 93.3 % for NH 4 ? -N, and 58.2 % for total nitrogen (T-N). Lowering HLR and D/W can enhance nitrogen removal. Nitrogen speciation and transformation were examined under an optimised condition with an HLR of 0.36 m day -1 and a D/W of 3. The results of isotope d 15 N-NO 3 -dilution showed that NO 3 --N was mainly produced in trickling bio-filter and vermibio-filter (VBF)

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“…It is possible that conditions in the sub-irrigated raingardens, particularly the Lined, were less favourable for earthworm and other animal activity. Apart from vegetable growth, this might also affect the capability of the system to remove pollutants from runoff (Tomar and Suthar, 2011).…”

Section: Yield and Irrigation Requirementsmentioning

confidence: 99%