다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Effects of textile dyes on health and the environment and bioremediation potential of living organisms

In pressure-driven membrane processes (reverse osmosis, nanofiltration, ultrafiltration, and microfiltration) a pressure exerted on the solution at one side of the membrane serves as a driving force to separate it into a permeate and a retentate. The permeate is usually pure water, whereas the retentate is a concentrated solution that must be disposed of or treated by other methods. Membranes may be polymeric, organo-mineral, ceramic, or metallic, and filtration techniques differ in pore size, from dense (no pores) to porous membranes. Depending on the type of technique, salts, small organic molecules, macromolecules, or particles can be retained, and the applied pressure will differ. This paper reviews the principles behind the different techniques, the types of membranes used, rejection mechanisms, and process modeling. Applications of pressure-driven membrane processes are also considered, including reverse osmosis and nanofiltration for the treatment of wastewater from landfills and composting plants, nanofiltration in the textile industry, and ultrafiltration and microfiltration in drinking water production and wastewater treatment.

Lastly, the paper discusses recent developments, including techniques to prevent membrane fouling by modifications affecting surface roughness or hydrophilicity/hydrophobicity, or by cleaning the membranes, and methods for treating or disposing of the retentate.

A review of pressure‐driven membrane processes in wastewater treatment and drinking water production

Nanomaterials (NMs) are gaining significance in technological applications due to their tunable chemical, physical, and mechanical properties and enhanced performance when compared with their bulkier counterparts. This review presents a summary of the general types of NMs and provides an overview of the various synthesis methods of nanoparticles (NPs) and their functionalization via covalent or noncovalent interactions using different methods. It highlights the techniques used for the characterization of NPs and discusses their physical and chemical properties. Due to their unique properties, NMs have several applications and have become part of our daily lives. As a result, nanotoxicity research is gaining attention since some NPs are not easily degraded by the environment. Thus, this review also highlights research efforts into the fate, behavior, and toxicity of different classes of NMs in the environment.

Nanomaterials: Classification, properties, and environmental toxicities

Application of response surface methodology and artificial neural network methods in modelling and optimization of biosorption process.

Studies on transport mechanism of Cr(VI) extraction from an acidic solution using liquid surfactant membranes

The present work aimed to synthesize Graphene oxide impregnated chitosan–PVA​ hydrogel nano polymer and its application to remove Congo red dye present in solution. Adsorption of dye on GO fabricated hydrogel polymer was conducted in batch system. Prepared Graphene oxide reinforced hydrogel polymer (GORHP) was characterized by analyzing FTIR and SEM. Swelling response of synthesized polymer composite were investigated at different pH. Final concentrations of dye in solution and adsorption capacities of adsorbent at various experimental conditions (adsorbent mass, solution pH and initial adsorbate concentration in solution) were evaluated. At pH 2, dye adsorption efficiency was found as 88.17%for 20 mg/L of Congo red solution using 6g/L dose at 140 rpm rotation speed and at neutral pH condition it was ≃ 81%. Different adsorption Isotherm models were analyzed mathematically. Kinetic study was performed and evaluated by following different mathematical model. Pseudo second order kinetic model gave better agreement for experimental and model value of q e . Results inferred that this synthesized polymer composite may be an efficient adsorbent for dye removal. The correlation between the independent variables associated with Congo red dye adsorption and the dependent parameters ware established by analyzing ANN model.

Synthesis of hybrid hydrogel nano-polymer composite using Graphene oxide, Chitosan and PVA and its application in waste water treatment

Assessment on the decolourization of textile dye (Reactive Yellow) using Pseudomonas sp. immobilized on fly ash: Response surface methodology optimization and toxicity evaluation.

Extraction of dye from aqueous solution in rotating packed bed

Rotating packed bed (RPB) with split packing has been developed recently to overcome the limitation of negligible tangential slip velocity between vapor and packing obtained with single rotating packing element of conventional RPB design. This work evaluates the performance of this contactor for separation of binary mixture methanol–ethanol by distillation. Experiments were carried out at total reflux condition. The height equivalent of a theoretical plate (HETP) of 2.9 cm was obtained at F -factor = 0.6 (m/s) (kg/m 3 ) 0.5 and rotor speed of 1100 rpm. Comparison with distillation studies reported for this system in the literature indicated that the mass transfer performance of this rotor design was superior to that of conventional RPB. Analysis of the experimental data also suggested that the rotor speed influenced the overall volumetric mass transfer coefficient to a greater degree in this design.

https://www.tpbin.com/Uploads/Subjects/8cb14558-feca-4f93-b25c-c851d774cf00.pdf

Avijit Bhowal

Papers

Studies on transport mechanism of Cr(VI) extraction from an acidic solution using liquid surfactant membranes

Synthesis of hybrid hydrogel nano-polymer composite using Graphene oxide, Chitosan and PVA and its application in waste water treatment

Assessment on the decolourization of textile dye (Reactive Yellow) using Pseudomonas sp. immobilized on fly ash: Response surface methodology optimization and toxicity evaluation.

Extraction of dye from aqueous solution in rotating packed bed

Distillation studies in rotating packed bed with split packing