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A phosphate-selective sorbent for the REM NUT® process: field experience at Massafra Wastewater Treatment Plant
No full textAbstract
P-control technologies from municipal wastewater are based on ‘‘destructive’’ methods leading to formation of solidphases
(sludge) that are disposed-off in controlled landfills. Non-destructive methods, based on selective liquid–solid
separations allow for removal of pollutants and their recovery to the same and/or related productive lines. REM
NUT, an ion exchange based process, removes selectively nutrients (HPO2 4 , NHþ4
, Kþ) present in biologically oxidised
municipal effluents and recovery in the form of struvites (MgNH4PO4; MgKPO4), premium quality slow release
fertilisers. The main limitation, for the extensive application of the process, is the availability of specific anion exchangers
for selective removal of phosphates.
The paper illustrates laboratory and field experience carried-out at Massafra (S.E. Italy) Wastewater Treatment
Plant (MWTP) with a revisited ‘‘P-driven’’ version of the REM NUT scheme and the use of a new phosphate-selective
sorbent developed at Lehigh University, PA, USA.P-control technologies from municipal wastewater are based on “destructive” methods leading to formation of solid-phases (sludge) that are disposed-off in controlled landfills. Non-destructive methods, based on selective liquid–solid separations allow for removal of pollutants and their recovery to the same and/or related productive lines. REM NUT®, an ion exchange based process, removes selectively nutrients (HPO42−, NH4+, K+) present in biologically oxidised municipal effluents and recovery in the form of struvites (MgNH4PO4; MgKPO4), premium quality slow release fertilisers. The main limitation, for the extensive application of the process, is the availability of specific anion exchangers for selective removal of phosphates.
The paper illustrates laboratory and field experience carried-out at Massafra (S.E. Italy) Wastewater Treatment Plant (MWTP) with a revisited “P-driven” version of the REM NUT® scheme and the use of a new phosphate-selective sorbent developed at Lehigh University, PA, USA
A new phosphate-selective sorbent for the Rem Nut process. Laboratory investigation and field experience at a medium size wastewater treatment plant
No full textP-control technologies for municipal wastewater are essentially based on "destructive" methods, that lead to formation of concentrated solid-phases (sludge), usually disposed-off in controlled landfills. Ion exchange, as a "non-destructive" technology, allows for selective removal and simultaneous recovery of pollutants, which can be recycled to the same and/or related productive lines. In this context, the REM NUT(R) process removes nutrient species (HPO4=, NH4+, K+) present in biologically oxidised municipal effluents and recovers them in the form of struvites (MgNH4PO4; MgKPO4), premium quality slow release fertilisers. The main limitation to the extensive application of this ion exchange based process is the non-availability of selective exchangers for specific removal of nutrient species. This paper illustrates laboratory investigation and pilot scale development of a so-called "P-driven" modified REM NUT scheme based on a new phosphate-selective sorbent developed at Lehigh University, PA, USA
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Greener and sustainable approach for the synthesis of commercially important epoxide building blocks using polymer-supported Mo(VI) complexes as catalysts
Get PDFThe growing concern for the environment, increasingly stringent standards for the release of chemicals into the environment and economic competitiveness have prompted extensive efforts to improve chemical synthesis and manufacturing methods as well as development of new synthetic methodologies that minimise or completely eliminate pollutants. As a consequence, more and more attention has been focused on the use of safer chemicals through proper design of clean processes and products. Epoxides are key raw materials or intermediates in organic synthesis, particularly for the functionalisation of substrates and production of a wide variety of chemicals such as pharmaceuticals, plastics, paints, perfumes, food additives and adhesives. The conventional methods for the industrial production of epoxides employ either stoichiometric peracids or chlorohydrin as an oxygen source. However, both methods have serious environmental impact as the former produces an equivalent amount of acid waste, whilst the later yields chlorinated by-products and calcium chloride waste. Hence, a greener and efficient route for catalytic epoxidation that could improve manufacturing efficiency by reducing operational cost and minimising waste products is highly desired. In this chapter, a greener alkene epoxidation process using molybdenum (Mo) based heterogeneous catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant has been presented. A polystyrene 2-(aminomethyl)pyridine supported molybdenum(VI) complex, i.e. Ps.AMP.Mo and a polybenzimidazole supported Mo(VI) complex, i.e. PBI.Mo have been successfully prepared and characterised. The catalytic activities of the polymer supported Mo(VI) complexes have been evaluated for epoxidation of 1-hexene and 4-vinyl-1-cyclohexene (4-VCH) in a batch reactor. Experiments have been carried out to study the effect of reaction temperature, feed molar ratio of alkene to TBHP and catalyst loading on the yield of epoxide for optimisation of reaction conditions in a batch reactor. The long term stability of the polymer supported Mo(VI) catalysts have been evaluated by recycling the catalysts several times in batch experiments using conditions that form the basis for continuous epoxidation studies. The extent of Mo leaching from each polymer supported catalyst has been investigated by isolating any residue from reaction supernatant studies after removal of heterogeneous catalyst and using the residue as potential catalyst for epoxidation. The efficiency of Ps.AMP.Mo catalyst has been assessed for continuous epoxidation of 1-hexene and 4-vinyl-1-cyclohexne with TBHP as an oxidant using a FlowSyn reactor by studying the effect of reaction temperature, feed molar ratio of alkene to TBHP and feed flow rate on the conversion of TBHP and the yield of epoxide. The catalysts were found to be active and selective for batch and continuous epoxidation of alkenes using TBHP as an oxidant. The continuous epoxidation in a FlowSyn reactor has shown considerable time savings, high reproducibility and selectivity along with remarkable improvement in catalyst stability compared to the reactions carried out in a batch reactor
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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