1,721,019 research outputs found
Ozone treatment of textile wastewaters for reuse
No full textTreatment of textile wastewaters by means of an ozonation pilot plant are described. Wastewaters used were produced by a dyeing and finishing factory and were first treated in an active sludge plant and filtrated through sand. In the appropriate conditions very high colour removal (95-99%) was achieved and the effluent could be reused in production processes requiring water of high quality as dyeing yarns or light colorations. Even if the chemical oxygen demand of treated waters was still in a range (75-120 mg/l, a decrease of up to 60%) that was usually considered to be too high for recycling purposes, recycling experiments were successful. The economical viability of the techniques implementation was also demonstrated and the industrial plant is currently under realisation under an EU financed project.
The paper considers also the possible improvement of ozone diffusion by means of membrane contactors realised in a second pilot plant, in order to further reduce operating costs of the technique. With respect to traditional systems, the gas/liquid contact surface is much higher being that of the membrane. Ozone at the interface is therefore immediately solubilized and potentially consumed with no additional resistance to the mass transfer.</jats:p
Catalytic membrane reactors for the oxidehydrogenation of propane: experimental and modelling study
No full textAcid and Alkali Pre-treatment Studies on Brewer’s Spent Grains (BSG)
No full textOne of the main by product obtained during beer production in the brewing industry is brewer’s spent grains (BSG). They are rich in cellulose, hemicellulose, lignin, and proteins. The aim of the work is to explore the effect of acid and alkali pre-treatments on BSG by studying the solubilisation behaviour of the organic molecules. BSG is chemically pre-treated using (alkali addition using NaOH, acid addition-HCl) by varying the concentration. After the pre-treatments, analyses such as pH measurements, total sugars using refractometer, reducing sugars using 3,5-Dinitrosalicylic acid (DNS) Miller’s method, total polyphenols using Folin–Ciocalteu method, proteins using Lowry method are carried out on the liquid phase. The results obtained could provide better insights into efficient chemical pre-treatment studies of BSG and further valorisation
Effect of varying hydrothermal temperature, time, and sludge pH on sludge solubilisation
No full textIn recent years, hydrothermal treatment has been considered as among the most promising option for sludge solubilisation and carbon recovery in terms of sludge management. In this study, the effect of different individual hydrothermal operating conditions like temperature (110–250 °C), sludge pH (6–13) and reaction time (0.5–3 h) were varied to understand their influence on sludge solubilisation. The most effective hydrothermal conditions (severity factor of 9.7) were found to be at 200 °C, sludge pH of 12 and reaction time of 1 h which solubilised about 1743 mg/g and 131 mg/g of COD and carbohydrates respectively into the aqueous phase. Also, gas chromatography- mass spectrometry (GC–MS) analysis was done that identified the organic compounds in the treated liquid phase to be mainly carboxylic acids, phenols, esters, and their derivatives. Although further studies are required to efficiently separate and recover the different organic compounds present, this work provides more insights for future valorisation of the organic rich hydrothermally treated liquid phase
Characterization of SiO2 thin film obtained by the sol-gel route from TEOS and TRITON-X45
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