Process Performance Combining Natural Coagulant Moringa oleifera Lam and Ultrafiltration for Groundwater Defluoridation

2021 ◽  
Vol 232 (6) ◽  
Author(s):  
Vinicius Masquetti da Conceição ◽  
Natália Ueda Yamaguchi ◽  
Fátima de Jesus Bassetti ◽  
Rosângela Bergamasco
Author(s):  
Bruna Souza dos Santos ◽  
Eduardo Eyng ◽  
Paulo Rodrigo Stival Bittencourt ◽  
Laercio Mantovani Frare ◽  
Éder Lisandro de Moraes Flores ◽  
...  

Wastewaters from textile industries are known for their difficulty to treat, several alternative technologies are applied for their treatment. In this context, the study examined a hybrid treatment system, composed of electrocoagulation combined with a natural coagulant (extract of Moringa oleífera lam seeds) to remove reactive dye Blue 5G aqueous solutions. The work evaluated the use of milder operating conditions to improve the efficiency of treatment, with reduced demands for electrical power and coagulant.  The following factors were evaluated: electric current intensity, natural coagulant concentration and hydraulic retention time. A quadratic model was adjusted and validated at a 5% significance level. The overall optimization resulted in conditions of 0.28 A for electrical current intensity, 1000.00 mg L-1 of aqueous extract of Moringa oleífera lam and 5 min for hydraulic retention time. While operating under optimal conditions, the removal of 71.38% of color and 5.22 mg L-1 of iron residual concentration was achieved.


2017 ◽  
pp. 357-364 ◽  
Author(s):  
G.A.P. Mateus ◽  
L.A. de M. Pinto ◽  
A.T.A. Baptista ◽  
L. Nishi ◽  
M.R.F. Klen ◽  
...  

2020 ◽  
Vol 9 (5) ◽  
pp. e28953169
Author(s):  
Amarílis Severino e Souza ◽  
Kassia Graciele dos Santos

Cassava starch has many known applications in food, paper, glue and textile industries, including even biodegradable packaging. In small and medium industries, the starch is obtained by washing the peeled and grinded manioc roots, followed by leaving the washwater for settling before drying the concentrated slurry. Since starch particles are very fine and have a low density, their settling time is high, resulting in a batch operation that lasts for 18 to 24 h. Therefore, it becomes suitable to form larger and heavier starch sets by means of applying coagulants, allowing the particles to settle faster. In the work reported here, the natural coagulant M. oleifera seed extract was used to decrease the settling time of the cassava starch. The effect of the initial concentration of the particles and the coagulant content on the final sedimentation time was evaluated on the batch settling tests. The results showed that the use of the coagulant reduced the sedimentation time in a beaker from 14h to 2h, allowing a quick batch operation.


e-xacta ◽  
2013 ◽  
Vol 6 (2) ◽  
pp. 121
Author(s):  
Vinicius Masquetti da Conceição ◽  
Fátima De Jesus Bassetti ◽  
Rosângela Bergamasco

<p align="justify">O presente trabalho teve como objetivo avaliar a redução de flúor pelo processo de coagulação/floculação com coagulante natural de semente de Moringa oleifera Lam (MO). Os ensaios foram realizados em equipamento “jar test”, sendo a MO nas concentrações de 1,5; 2,0; 2,5; 3,0; 4,0 e 5,0 g/L. As amostras de água consistiam em água deionizada fluorada com NaF nas concentrações de 3,0 e 5,0 mg F/L e pH neutro, visando simular águas subterrâneas com problemas de excesso de flúor. O monitoramento do sistema de tratamento proposto foi verificado através das análises de flúor, pH, turbidez, cor aparente e condutividade. Os resultados demonstraram valores de eficiência de redução do flúor, sendo que, para as concentrações iniciais de 3 e 5 mg F/L, os residuais de fluoreto foram de 1,20 e 1,69 mg/L, 60 e 66 % de remoção respectivamente, para a concentração de 5.0 g/L de MO, valores estes dentro e próximos ao valor máximo estabelecido pela Portaria nº 2.914/2011 do MS (1,5 mg F/L) para as águas destinadas ao consumo humano. Os valores de pH final ficaram dentro da faixa de neutralidade, enquanto que, para os valores dos parâmetros de cor, turbidez e condutividade final, houve um aumento proporcional à concentração de MO utilizada. De modo geral, o processo de coagulação/floculação com extratos de MO demonstrou ser como uma boa alternativa para a redução de flúor em águas, tendo-se em vista a utilização de um coagulante natural, biodegradável e responsável pela produção de menor volume de lodo, diferentemente do que é observado com a utilização de coagulantes químicos.</p><p>Abstract</p><p>The present work had as objective to evaluate the reduction of fluoride contained in excess of water by the process of coagulation\/flocculation with natural coagulant Moringa oleifera seed Lam (MO). The tests were performed on equipment "jar test", being the MO, used in the form of aqueous extract at concentrations of 1.5, 2.0, 2.5, 3.0, 4.0 and 5.0 g/L. Water samples consisted of deionized water with fluorine with NaF at concentrations of 3.0 and 5.0 mg F/L and pH neutral, aimed at simulating groundwater problems of excess fluoride. The monitoring system proposed treatment was verified through the analysis of fluoride, pH, turbidity, apparent color and conductivity. The results showed good values of fluoride reduction efficiency, and for the initial concentrations of 5 and 3 mg F/L, the residual fluoride were 1.20 and 1.69 mg/L, 60 and 66 % respectively, removal for the concentration of 5.0 g/L of MO, these values within and around the maximum value established by Ordinance No . 2,914\/MS 2011 (1.5 mg F/L) for the waters intended for human consumption. The final pH values were within the range of neutrality, while for the values of the parameters of colour, turbidity and conductivity end, there has been an increase proportional to the concentration of MO used. Generally speaking, the process of coagulation/ flocculation with extracts of MO, proved to be as a good alternative to the reduction of fluoride in water, having in mind the use of a natural coagulant, biodegradable and responsible for producing lower volume of sludge, unlike what is observed with the use of chemical coagulants.</p>


e-xacta ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 153 ◽  
Author(s):  
Livia De Oliveira Ruiz Moreti ◽  
Franciele Pereira Camacho ◽  
Milene Carvalho Bongiovani ◽  
Ana Paula Stroher ◽  
Leticia Nishi ◽  
...  

<p align="justify">Este trabalho avaliou a eficiência das sementes de Moringa oleifera Lam como coagulante natural no processo de coagulação/floculação/sedimentação (C/F/S), seguido de ultrafiltração (UF), para a obtenção da remoção de cor, turbidez, coliformes totais, Escherichia coli e pH da água tratada. Para os ensaios, foi utilizada água bruta com turbidez na faixa de 150 à 550 uT proveniente do Rio Pirapó. O processo C/F/S foi realizado com o coagulante natural Moringa oleifera (MO) extraído em solução salina de KCl e NaCl (1M) e com o coagulante químico Policloreto de Alumínio (PAC), nas dosagens de 25 à 300 mg.L-1. Para os ensaios de UF foi utilizada uma membrana de poli (éter sulfona) à pressão de 3 bar. Pode-se observar que a Moringa não influencia o pH do meio, o qual manteve-se estável em todas as dosagens. O processo combinado C/F/S+UF se apresentou eficiente, pois os parâmetros analisados atingiram os valores estabelecidos pela Portaria nº 2914 do Ministério da Saúde. PALAVRAS-CHAVE: Coagulação/floculação/sedimentação, ultrafiltração, Moringa oleífera.</p><p align="justify">Abstract</p><p align="justify">This study investigated the efficiency of Moringa oleifera seeds as natural coagulant in coagulation/flocculation/sedimentation (C/F/S) process, followed by ultrafiltration (UF) for color, turbidity, total coliforms and Escherichia coli removal and pH of the treated water. For the tests a raw water with turbidity 150-550 uT, from the River basin Pirapó was used. The C/F/S process was performed using the Moringa oleifera extracted in saline solution of KCl and NaCl (1M), and Poly Aluminum Chloride (PAC) as chemical coagulant, in dosage from 25 to 300 mg.L-1 . In UF process, it was used a membrane of poly (eter sulfone) in a working pressure of 3 bar. In the results, one can observe that the Moringa does not influence the pH of the medium, which remained stable at all dosages. The combined process C/F/S+UF showed efficient, because the analyzed parameters reach the values established by Regulation nº 2914 of the Ministry of Health.</p>


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