Preparation and characterization of polysulfone-polyurethane membranes for recovery of simulated wastewater from industrial textile processes

2020 ◽  
pp. 1-14
Author(s):  
N. J. Bogoni ◽  
C. R. Schut ◽  
J. Z. Merck ◽  
J. Duarte ◽  
C. M. Menezes ◽  
...  
2019 ◽  
Vol 79 (4) ◽  
pp. 597-606 ◽  
Author(s):  
E. V. Vidya Vijay ◽  
M. Jerold ◽  
M. S. Ramya Sankar ◽  
Sanjay Lakshmanan ◽  
V. Sivasubramanian

Abstract The current research work studies the removal of crystal violet (also known as gentian violet), a kind of dye, from simulated wastewater by electrocoagulation using scrap aluminium roofing sheet as electrode in a batch electrochemical cell. Optimization of different operational parameters – pH, current density, time, initial concentration – was carried out experimentally. The equilibrium was attained at 1 hour and at pH 11. After suitable optimization, a removal of above 90% was achieved at an optimum current density of 20 mA/m2. Also, the adsorption behaviour of crystal violet in electrocoagulation was also studied and the isothermal and kinetic models were proposed to be the Dubinin–Radushkevich model and pseudo-first order model. The mechanism involved during the process was suggested as chemisorption. The adsorption thermodynamic studies were a clear indication that the process is spontaneous and endothermic as well as thermodynamically favourable too. Both chemical and physical characterization of the flocs generated during the electrolysis was explained by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) respectively.


1990 ◽  
Vol 6 (3) ◽  
pp. 227-237 ◽  
Author(s):  
M. Kiremitçi ◽  
M. Pulat ◽  
C. Şenvar ◽  
A.İ Şerbetçi ◽  
E. Pişkin

2016 ◽  
Vol 50 (2) ◽  
pp. 105-121 ◽  
Author(s):  
Azzaya Tumendelger ◽  
Sakae Toyoda ◽  
Naohiro Yoshida ◽  
Hiroshi Shiomi ◽  
Rina Kouno

2021 ◽  
Vol 22 (2) ◽  
pp. 190-198
Author(s):  
Tia Agustiani ◽  
Asep Saefumillah ◽  
Hanies Ambarsari

ABSTRACT Biomass as raw material is one solution that can be developed in the management of agricultural, plantation, and industrial waste. The utilization of biomass-derived from waste can help reduce pollution and environmental pollution. This research was conducted to make Silicon Carbide (SiC) adsorbent from wood biomass using Sengon sawdust as a source of carbon and non-wood biomass, namely coconut husk, as a source of silica. SiC adsorbent is applied for ammonium adsorption, which has implications on reducing ammonia gas from wastewater, reducing odor. The research methods included isolation of silica and carbon, the production of SiC adsorbent by magnesiothermic reduction, and the characterization of SiC adsorbents with XRD and SEM-EDX. Adsorption capacities of SiC to ammonium were determined according to SiO2:C adsorbent ratios (1:3 and 5:3), adsorbent mass variations, and ammonium concentrations in simulated wastewater using the spectrophotometric method. The results showed that SiC could be used as an adsorbent because there are pores on the surface structure. The optimum SiO2:C adsorbent ratio in adsorbing ammonium was 1:3 (SiC 136) with 45% adsorbed ammonium and an adsorption capacity of 0.47 mg/g. The optimum adsorbent mass in adsorbing ammonium was 0.1 g with 41.77% adsorbed ammonium. The optimum concentration of ammonium in simulated wastewater for ammonium adsorption was 20 mg/L with 46.25% adsorbed ammonium. The adsorption isotherm pattern during the ammonium adsorption process follows the Freundlich isotherm, which means that the adsorption process occurs physically. Keywords: adsorbent, adsorption, ammonia, biomass, coconut husk, SiC   ABSTRAK Biomassa sebagai raw material merupakan salah satu solusi yang dapat dikembangkan dalam pengelolaan limbah hasil pertanian, perkebunan, dan industri. Pemanfaatan biomassa yang berasal dari limbah dapat membantu mengurangi tingkat polusi dan pencemaran lingkungan. Penelitian ini dilakukan untuk membuat adsorben Silikon Carbida (SiC) dari biomassa kayu yaitu memanfaatkan serbuk gergaji kayu Sengon sebagai sumber karbon dan biomassa non kayu yaitu sabut kelapa sebagai sumber silika. Adsorben SiC diaplikasikan dalam penjerapan amonium yang berimplikasi pada potensi penurunan gas amonia dari air limbah sehingga adsorben SiC berpotensi mengurangi bau dalam air limbah. Metode penelitian meliputi isolasi silika, isolasi karbon, pembuatan adsorben SiC secara reduksi magnesiotermik dan karakterisasi adsorben SiC dengan XRD dan SEM-EDX. Penentuan daya adsorpsi SiC sebagai adsorben terhadap variasi rasio adsorben SiO2:C (1:3 dan 5:3), variasi massa adsorben, variasi konsentrasi limbah simulasi menggunakan metode spektrofotometri. Hasil penelitian menunjukkan bahwa SiC dapat digunakan sebagai adsorben karena terdapat pori-pori pada struktur permukaan. Variasi rasio adsorben SiO2:C optimum dalam mengadsorpsi amonium ialah SiC 136 dengan amonium teradsorpsi sebanyak 45% dan kapasitas adsorpsi sebesar 0,47 mg/g. Massa adsorben optimum dalam mengadsorpsi amonium ialah 0,1 g dengan amonium teradsorpsi 41,77%. Konsentrasi optimum limbah simulasi dalam adsorpsi amonium 20 mg/L dengan amonium teradsorpsi 46,25%. Pola isoterm adsorpsi selama proses adsorpsi amonium mengikuti isoterm Freundlich, yang berarti proses adsorpsi cenderung terjadi secara fisika. Kata kunci: adsorben, adsorpsi, amonia, biomassa, sabut kelapa, SiC


2010 ◽  
Vol 07 (13) ◽  
pp. 33-45
Author(s):  
Alexandre Andrade CERQUEIRA ◽  
Mônica Regina da Costa MARQUES ◽  
Carlos RUSSO

This work is related to the electroflocculation process applied to the treatment of the production water, which is the main waste generated during the process of exploration and production of oil. This wastewater is contains toxic chemicals, inorganic salts and heavy metals, which hinders its treatment and final disposal. Lately, this water is being re-injected into the production wells to increase the pressure, but its quality is not adequate. For the treatment of this effluent various technologies have been proposed, and the aim of this paper is to study the feasibility of application of the electroflocculation using alternate current variable frequency in the treatment of a simulated wastewater. The equipment used both direct and variable frequency alternate current. Aluminium was the material as the electrodes, and all runs were carried in a batch system. The analysis related to the characterization of the raw and electroflocculated wastewater were: oil and grease, turbidity, color, pH and conductivity. The results showed that it was possible to obtain removal efficiencies of oils and greases, color and turbidity above 98%.


Author(s):  
B. L. Soloff ◽  
T. A. Rado

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.


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