Wyniki wyszukiwania - BazTech

1

Use of a New Bio-Flocculent Extracted from Moroccan Cactus in the Treatment of Polyphenol-Laden Waste by the Flocculation Coagulation Process

El Mansouri Ibtissame, Lahkimi Amal, El Outassi Noureddine, Adachi Abderrazzak, Bekkari Hicham

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 5

51--62

EN

Olive cultivation is currently the subject of great exposure (Ministry of Agriculture and Maritime Fishing, 2015), and as a consequence of the implementation of the national olive cultivation development programme, an area of 1,220,000 ha (+ 120%) and a total olive production of 2,500,000 tonnes/year (+ 70%) are among the objectives of the Green Morocco Plan by 2020. The olive sector has experienced a very important movement in the context of the 2017–2018 campaign, which Morocco should record a volume never reached before, with a production record estimated at 1.56 million tons, the production of this campaign shows an increase of 47.8% compared to the previous season. In this work, we determined the efficiency of a new biodegradable natural flocculant extracted from the prickly pear Opuntia ficus indica in a physico-chemical process by coagulation-flocculation, to treat liquid discharges loaded with organic matter and phenols difficult to degrade. The tests were carried out on six well-preserved samples subjected to increasing concentrations of coagulant and flocculant after adjustment of the pH. The results obtained are very encouraging for this type of physico-chemical treatment and work is still in progress until there is a significant improvement in the rate of abatement of the pollutant load.

2

Dynamic mechanical analysis and thermal analysis of untreated Coccinia indica fiber composites

Balu S., Sampath P. S., Bhuvaneshwaran M., Chandrasekar G., Karthik A., Sagadevan Suresh

Polimery

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2020

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T. 65, nr 5

357--362

EN

A natural fiber reinforced polymer matrix composites (FRCs) was prepared by the compression molding method. The natural fiber named Coccinia indica (CI) was employed to fabricate FRCs. The impact of fiber length on storage modulus, loss modulus and loss of weight in the FRCs were determined using dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). The results revealed that a fiber length of 40 mm shows better storage modulus and nominal loss modulus owing to the higher interfacial bonding between fiber and matrix. In other investigated fiber lengths, the storage modulus is poor and loss modulus is high, which is due to inefficient stress transfer.

PL

Metodą wytłaczania przygotowano próbki kompozytów (FRC) na osnowie polimerowej wzmocnionej włóknami naturalnymi Coccinia indica (CI). Wpływ długości zastosowanych włókien na moduł zachowawczy, moduł stratności i ubytek masy badanych FRC oceniano za pomocą dynamicznej analizy mechanicznej (DMA) i analizy termograwimetrycznej (TGA). Stwierdzono, że kompozyty z udziałem włókien o długości 40 mm wykazują korzystniejszy moduł zachowawczy i nominalny moduł stratności, dzięki lepszemu wiązaniu międzyfazowemu włókna z osnową. W wypadku kompozytów z zawartością włókien o innych długościach moduł zachowawczy jest mały, a moduł stratności duży, co wynika z nieefektywnego przenoszenia naprężeń.

3

The Performance of Hybrid Constructed Wetland System for Treating the Batik Wastewater

Rahmadyanti Erina, Audina Oktavia

Journal of Ecological Engineering

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2020

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Vol. 21, nr 3

94--103

EN

The batik industry is one of the Indonesian economic drivers. However, most of the batik industries discharge their wastewater without any prior treatment, thus endangering the environment. This research aims to investigate the ability of hybrid constructed wetlands (CWs) system using Canna indica in the batik wastewater treatment. The parameters studied were chemical oxygen demand (COD), total suspended solid (TSS), and oil and grease (FOG) with 3, 5, and 7 days of hydraulic retention time (HRT). The results indicate that the hybrid constructed wetland system using Canna indica optimally gains the COD and FOG removal efficiency on day 3 at 89.61% and 89.53%, while the TSS removal efficiency on day 5 at 98.74%. Despite the high removal efficiency, the effluent parameters remain below the standards for direct discharge into waterbodies. Therefore, further research is needed to investigate the appropriate pre-/advanced treatment to be combined with the hybrid constructed wetland in batik wastewater treatment.

4

Physicochemical and mechanical properties of natural cellulosic fiber from Coccinia Indica and its epoxy composites

Bhuvaneshwaran M., Sampath P. S., Balu S., Sagadevan S.

Polimery

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2019

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T. 64, nr 10

656--664

EN

This paper reports on the physicochemical, and mechanical characterization of Coccinia Indica (CI) fiber. The Coccinia Indica fiber (CIF) reinforced epoxy composite is fabricated using a compression molding process. The results of the chemical analysis of CIF showed that the fiber contained more cellulose and skimpy lignin, ash, and wax content. Scanning electron microscopy (SEM) analysis revealed that the fiber possessed a multicellular structure. The Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) studies revealed that CIF shows a crystallinity index of 30%. The thermogravimetric analysis (TGA) indicated that the major degradation of fibers occurred in the temperature range of 204.2 °C to 376.3 °C. The various mechanical test results showed that the tensile, flexural and impact strength increased with increase in fiber length and weight percentage. The maximum properties were found at 30 mm fiber length and 35% of fiber loading. The SEM fractography result showed that the predominant mechanism for mechanical failure was due to fiber pull out, matrix fracture and fiber fracture.

PL

Oceniono fizykochemiczne i mechaniczne właściwości celulozowych włókien Coccinia Indica (CIF). Kompozyty na osnowie żywicy epoksydowej wzmocnionej CIF wytwarzano w procesie wytłaczania. Na podstawie analizy chemicznej stwierdzono, że włókna CIF zawierają dużą część celulozy i niewielką ligniny, popiołu i wosku. Metodą skaningowej mikroskopii elektronowej (SEM) wykazano, że włókna CI mają strukturę wielokomórkową. Na podstawie wyników spektroskopii w podczerwieni z transformacją Fouriera (FT-IR) i dyfrakcji rentgenowskiej (XRD) stwierdzono, że stopień krystaliczności CIF wynosi 30%. Analiza termograwimetryczna (TGA) wykazała, że główna degradacja włókien zachodzi w temperaturze z zakresu 204,2–376,3°C. Wyniki testów mechanicznych dowodzą, że wartości wytrzymałości na rozciąganie, zginanie i uderzenie zwiększały się wraz z długością włókien i ich zawartością w kompozycie. Maksymalnymi wartościami właściwości odznaczał się kompozyt na bazie żywicy epoksydowej napełnionej 35% mas. włókien Coccinia Indica o długości 30 mm. Wyniki analizy SEM wykazały, że decydujący wpływ na uszkodzenie mechaniczne miało wyciąganie włókien, pękanie osnowy i pękanie włókien.

5

Physico-Chemical Properties of Biodiesel Produced from Neem Oil

Bhandare P., Naik G. R.

International Letters of Chemistry, Physics and Astronomy

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2015

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Vol. 47

40--48

EN

Biodiesel is becoming prominent among the alternatives to conventional petro-diesel due to economic, environmental and social factors. The quality of biodiesel is influenced by the nature of feedstock and the production processes employed. High amounts of free fatty acids (FFA) in the feedstock are known to be detrimental to the quality of biodiesel. In addition, oils with compounds containing hydroxyl groups possess high viscosity due to hydrogen bonding. American Standards and Testing Materials, (ASTM D 6751) recommends FFA content of not more than 0.5% in biodiesel and a viscosity of less than 6 mm2/s. In this experiment the seed oils of 30 Neem (Azadirachta indica. A. juss) biotypes were screened and evaluated for their physico-chemical parameters for their potential in biodiesel. The properties of Neem biodiesel were compared with Bureau of Indian Standards (BIS) and the fuel properties of diesel. Results showed that high amounts of FFA in oils produced low quality biodiesel while neutralized oils with low amounts of FFA produced high quality biodiesel. The quality of biodiesel from jatropha and castor oils was improved greatly by neutralising the crude oils.

6

Potential of Saraca indica leaf powder (SILP) for chromium removal from aqueous solution

Goyal P., Sharma P., Srivastava S., Srivastava M.M.

Archiwum Ochrony Środowiska

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2007

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Vol. 33, no. 2

35-44

EN

The paper projects the potential of agricultural waste Saraca indica leaf powder (SILP) in biosorbing chromium from aqueous system. The influence of pH, contact time, metal concentration, biomass dosage and particle size on the selectivity of the removal process was investigated. The maximum sorption efficiency of SILP for Cr(III): 85.23% and Cr(VI): 89.67% was found to be pH dependent giving optimum sorption at pH 6.5 and 2.5 respectively. The adsorption process fitted well to both Freundlich and Langmuir isotherms. Morphological changes observed in Scanning Electron Micrographs of metal treated biomass confirm the existence of biosorption phenomenon. Fourier Transform Infra-red Spectrometry confirms that amino acid-Cr interactions contribute a significant role in the biosorption of chromium using target leaf powder. The successful applications of easily abundant agricultural waste SILP, as a biosorbent have potential for a low technological pretreatment step, prior to economically not viable high-tech chemical treatments for the removal of Cr from water bodies.

7

Adsorption behavior of cadmium and nickel from aqueous solution by Saraca indica leaf powder

Srivastava M. M., Chauhan A., Kumari P., Sharma P., Srivastava S.

Archiwum Ochrony Środowiska

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2005

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Vol. 31, no. 3

59--70

EN

The development of economic and efficient processes for the removal of toxic metals from water bodies has become a priority task for environmentalists. Biosorption processes arc tangible alternatives to traditional methodologies, particularly if low metal concentration, large volume and cost arc considered. The present communication reports the unexploited sorption properties of the Saraca indica leaf powder (S1LP) for the removal of Cd(ll) and Ni(II) from aqueous media. Sorption studies using standard practices were carried out in batch experiments as a function of biomass dosage, metal concentration, contact time, particle size and pH. Sorption studies result into the standardization of optimum conditions for the removal of Cd(II) - 92.60% and Ni(II) - 46.20% as follows: biomass dosage (4.0 g), metal concentration (Cd(II) 10 ug/cm3, Ni(II) 10 ug/cm3) and volume of the test solution (200 cm3) at pH 6.5 for Cd(II) and Ni(II). The present study explores for the first time, the efficacy of Saraca indica leaf powder as a novel and environment friendly possibility to remediate heavy metal contaminated water in a cost efficient manner.