Campina Grande, Brazil
Campina Grande, Brazil
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Leite V.D.,CCT UEPB | Barros A.J.M.,Federal University of Campina Grande | Lopes W.S.,CCT UEPB | de Sousa J.T.,CCT UEPB
Engenharia Agricola | Year: 2014

Sanitary landfill leachates present high concentrations of carbonaceous and nitrogenous materials. The crucial point is that carbonaceous materials are of difficult biodegradation, what compromises the performance of biological treatment processes, while nitrogenous materials, such as ammonia nitrogen, probably preclude the use of biological treatments. Therefore, the aim of this work was to study the desorption process of ammonia nitrogen from sanitary landfill leachate in filling towers. Desorption was carried out in filling towers of 35 L capacity. The leachate was collected from a sanitary landfill located in João Pessoa, Paraíba State, Brazil. Desorption efficiency for the pH values adopted in four treatments was 93% minimum and 95.5% maximum, with aeration mean time ranging from 3 to 6 hours. The limiting factors of ammonia nitrogen desorption from sanitary landfill leachates in filling towers are associated with the use of alkalizer species for pH correction, and electricity costs for aeration.

Silva G.A.S.,Federal University of Campina Grande | Cavalcanti M.T.,Federal University of Campina Grande | Almeida M.C.B.M.,Federal University of Campina Grande | Araujo A.S.,Federal University of Campina Grande | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

The industrial processing of mango generates a large volume of waste, which is not reused or properly disposed. This study aimed to extract starch from almond of Tommy Atkins mango and use it as a thickener in dairy beverages. The starch was characterized by physicochemical and microbiological analysis, and the granule morphology and gelling ability were observed by scanning electron microscopy, and used in dairy beverages at three concentrations (1.2, 0.6 and 0.3%), being submitted to sensory analysis. The starch showed extraction yield of 59.82% by weight of almonds with 10.14% moisture, 2.33% protein, 0.35% ash, 4.67% fat, and absence of pathogenic microorganisms. The shape of starch granules was irregular between spherical to ellipsoidal with different sizes. The minimum gelling concentration was observed in 6% starch. The prepared dairy beverages showed viable commercialization by presenting good sensory and physico-chemical characteristics, using 0.3% starch as thickener. The starch showed desirable characteristics, which can be widely used.

Cavalcanti M.T.,Federal University of Campina Grande | da Silva F.L.H.,Federal University of Paraiba | Cavalcanti J.H.F.,Federal University of Paraiba | Florentino E.R.,CCT UEPB | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

Fuzzy logic is applied in many areas of knowledge. In this logic every variable has a set of functions, represented in an X universe, which generally expresses a linguistic variables group of the system. This paper proposes a discussion on the use of fuzzy logic in sensory acceptance, from the taster's views of 'faveleira' (Cnidosculus phyllacanthus (Mart.)Pax. et K. Hoffm.) almonds and protein bread. It was observed that the developed controller method is easy to use and system's user only needs to find the curve of the GC with a final higher value to indicate the sample with greater acceptance. The user may use the derived CG curves aiding in the detection of the best choice in some situations, furthermore used in conjunction with other statistical method.

Fernandes J.D.,CCAA UEPB | Chaves L.H.G.,Federal University of Campina Grande | Dantas J.P.,CCT UEPB | Da Silva J.R.P.,CCAA UEPB
Revista Caatinga | Year: 2015

Castor produces racemes primary, secondary, tertiary, among others, whose contributions to the overall productivity differ. In this context, the aim was to evaluate the agronomic characteristics and to deter-mine the influence of the order of racemes and nutrient sources on yield of castor bean. Thus, under field con-ditions, in the municipality of Remigio, Paraíba State, an experiment with BRS Nordestina cultivar was carried out in randomized blocks design arranged in 5 (different sources of organic manure: without organic manure, compost, compost enriched with rock powders and manure and mineral complete) x 4 (orders of racemes pri-mary, secondary, tertiary and quaternary) factorial experiment, with four replications. During the experiment, plant height and insertion of racemes were evaluated, length and number of racemes, early blooming and matu-ration of racemes. After harvesting, the following variables were determined: mass of racemes, number of grains per plant, yield, weight of hundred grains, length and width of the grains and the contribution of differ-ent orders of racemes in total yield. The growth of castor bean increased with the fertilizing, especially for or-ganic compounds. The first inflorescences were emitted in castor bean plants fertilized organically. The mass of racemes, the number of grains per plant and productivity were higher in racemes of secondary and tertiary orders. The length and width of the grains was higher in primary racemes. The highest yields were obtained with the use of organic sources. © 2015, Universidade Federal Rural do Semi-Arid. All rights reserved.

Fernandes J.D.,CCAA UEPB | Chaves L.H.G.,Federal University of Campina Grande | Dantas J.P.,CCT UEPB | Silva J.R.P.,CCAA UEPB
Revista Ciencia Agronomica | Year: 2013

The objective of this work was to describe the periods of new-leaf formation, leaf abscission, the flowering and fuit-maturity of jatropha, Jatropha curcas L., as well as to determine some production variables of this species, in two crop cycles, fertilized with different sources of nutrient, in the municipality of Remígio, in the state of Paraíba. A randomized block design with five treatments and four replications was used. The treatments consisted of different sources of fertilization. During the months of May, 2007 to November, 2009 monthly evaluations of phenological events and the production of jatropha were made. Regardless of the treatment used, formation of new leaves was observed during the rainy season, and leaf abscission during both the colder and dryer months. Flowering in the first crop cycle began with the end of the rainy season, when using the organic compound II (F3), whereas in the second cycle, the first instances of inflorescence were observed at the start of the rainy season in those plants fertilized with the organic compound I (F2) and manure (F5). In all treatments the time verified between the instances of inflorescence and the physiological maturity of the fruit was approximately 120 days. For the first harvest, the sources of fertilizer did not produce any differences for any of the production variables, however, for the second harvest, besides there being an increase in production, the organic compound I (F2) and manure (F5) were those which gave the best results.

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