DESEMPENHO AGRONÔMICO DE CAPIM NAPIER (Pennisetum purpureum) CULTIVADO EM SISTEMAS ALAGADOS CONSTRUÍDOS

Matos, Antônio Teixeira de; Abrahão, Sérgio Silva; Pereira, Odilon Gomes

doi:10.13083/reveng.v19i5.335

Cited by 3 publications

(2 citation statements)

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“…Constructed wetland systems (CWs) are treatment systems planned and designed to use natural processes involving wetland vegetation, soils, and their associated microbial assemblages to improve water quality [ 1 ]. In CWs—under appropriate environmental conditions—physical, chemical and biochemical processes occur to treat sanitary sewage, industrial effluents and many types of wastewater [ 2 ]. Many countries have adopted these systems [ 3 ] because they require low-cost investments combined with their efficiency and feasibility [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of gibberellic acid on Tifton 85 bermudagrass (Cynodon spp.) in constructed wetland systems

et al. 2018

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This study aimed to evaluate 1) the influence of gibberellic acid (GA3) in the development of Tifton 85 bermudagrass grown in constructed wetland systems (CWs) and 2) the plant's capacity to remove nutrients and sodium from synthetic municipal wastewater (SMW). The experiment was carried out in Viçosa, Minas Gerais, Brazil, and consisted of foliar applications of GA3 set in randomized blocks design, with four replicates and 6 treatments as following: NC (control with plants); 0 μM GA3; N1: 5 μM GA3; N2: 25 μM GA3; N3: 50 and N4: 100 μM GA3 per CWs, NC* (control with no plants): 0 μM GA3. The study was conducted over two crop cycles in the spring 2016. The parameters used to evaluate the performance of the Tifton 85 bermudagrass were its plant height, productivity, chlorophyll measurement, number of internodes, nutrients and Na removals. Chemical analyses of the effluents were conducted. In response to the application of GA3, the increase in height of Tifton 85 bermudagrass in the first crop cycle was higher than the increase in height in the second crop cycle. The decrease in plant growth in response to GA3 in the second crop cycle may be linked to the age of the plant tissue and climatic conditions. The greater growth of the plants cultivated in the CWs allows a more efficient removal of pollutants, using simple management and low cost. The results suggest that applying 50 μM of GA3 to the development of Tifton 85 bermudagrass provides higher dry matter yield and removal of nitrogen, phosphorus, and sodium for the first crop cycle in CWs. However, in the second crop cycle, the application of GA3 had no effect on dry matter production and nutrient removal by Tifton 85 bermudagrass in CWs.

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Section: Introductionmentioning

confidence: 99%

Effects of gibberellic acid on Tifton 85 bermudagrass (Cynodon spp.) in constructed wetland systems

et al. 2018

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“…In the dairy industry, according to Matos et al (2011), a relationship of about 1 to 5 can be observed between volumes of wastewater and milk processed, depending on the final product and the technological level of the industry. The polluting organic load that these effluents present is high, and in the case of inappropriate treatment or disposal, major environmental impacts can be seen in the areas near this type of industry.…”

Section: Introductionmentioning

confidence: 99%

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2018

Rev. ambiente água

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Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Rev. ambiente água

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This work investigated the degradation of organic matter present in synthetic dairy wastewater by the combination of ozonation (ozone (O3)/hydrogen peroxide (H2O2)) and catalytic ozonation (ozone (O3)/manganese (Mn 2+ )) associated with dispersed air flotation process. The effect of independent factors such as O3 concentration, pH and H2O2 and Mn 2+ concentration was evaluated. For the flotation/O3/H2O2 treatment, the significant variables (p ≤ 0.05) were: O3 concentration (linear and quadratic effect), H2O2 concentration linear and quadratic effect, pH values (linear and quadratic effect) and interaction O3 concentration versus pH. For catalytic ozonation, it was observed that the significant variable was the linear effect of O3 concentration. According to the desirability function, it was concluded that the optimal condition for the treatment of flotation/O3/H2O2 can be obtained in acidic solution using O3 concentrations greater than 42.9 mg L -1 combined with higher concentrations of H2O2 to 1071.5 mg L -1 . On other hand, at pH values higher than 9.0, the addition of O3 may be neglected when using higher concentrations than 1071.5 mg L -1 of H2O2. For flotation/ozonation catalyzed by Mn 2+ , it was observed that metal addition did not affect treatment, resulting in an optimum condition: 53.8 mg L -1 of O3 and pH 3.6.Keywords: advanced oxidation processes, catalytic ozonation, physico-chemical treatment. Palavras-chave: ozonização catalítica, processos oxidativos avançados, tratamento físico-químico.

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DESEMPENHO AGRONÔMICO DE CAPIM NAPIER (Pennisetum purpureum) CULTIVADO EM SISTEMAS ALAGADOS CONSTRUÍDOS

Cited by 3 publications

References 1 publication

Effects of gibberellic acid on Tifton 85 bermudagrass (Cynodon spp.) in constructed wetland systems

Effects of gibberellic acid on Tifton 85 bermudagrass (Cynodon spp.) in constructed wetland systems

Untitled

Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

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