Muhammad Mubarak Hossen
Scientific Officer
Fibre Chemistry Department, Chemistry Division, BJRI.
Mahmuda Begum
PSO
Fibre Chemistry Department, Chemistry Division, BJRI.
Ayesha Khatton
SO
Industrial Chemistry Department, Chemistry Division, BJRI.
The investigation was carried out Chemistry Division, Bangladesh Jute Research Institute, Dhaka, Bangladesh during 2006-2007 on water quality that used in textile wet processing to study color, Suspended solid(SS) and Total dissolved solid (TDS). It was evident from the experiment that the water was free from hindrance effect of color and Turbidity/suspended solid but there is problem to use that water for the presence of excessive TDS. Water was analyzed to measure the TDS quantitatively for suggesting remedial measure to have suitable water to use in wet processing.
Wet Processing, Turbidity, Color, Suspended solid, Total dissolved solid
Fibre Chemistry Department. Chemistry Division. BJRI
The necessity of suitable water in the industries like textile purpose is an earlier idea. As the water is a vital solvent for all the wet processes such as printing, dyeing, bleaching, carbonizing, rinsing, sizing – desizing, degumming, scouring , finishing etc. so in one sense it is the life of the modern industries. The hardness property of water is due to the presence of Ca & Mg salt or ion in the water. Steam is a very common and suitable means for heating and drying purposes in the textile industries. To get this steam a huge amount of water is to use in boiler where deposits/scale like CaSiO3, CaCO3, CaSO4, Mg(OH)2 formation occur due to the hard water used in the system and ultimately causes a great damage of boiler and associated equipment. Small concentration of calcium carbonate causes corrosion of metallic pipes by laying down a protective coating. Not only that - the impurities Ca, Mg affect the properties of finished products. The Calcium & Magnesium carbonates convert into bicarbonate with the addition of carbon dioxide that always exists in natural water. The bicarbonate is soluble in water and is responsible for temporary hardness because it breaks easily into carbonate & carbon dioxide on boiling.
The color of water was measured by platinum- cobalt standard method. A series of standard color solutions were prepared by diluting the mother solution platinum- cobalt standard solution. Prepared standard samples having colors of 5, 10, 15 ---- upto 50 in Nessler’s tubes. As the color value of water is extremely pH dependent; the water pH was measured while color determination immediate after collection of the sample. The water under experiment was centrifuged for about 1 hour and clear supernatant water from the top was transferred to another beaker for measuring color by visual comparison of the sample with known concentration of colored solution.
International Journal of Sustainable Agricultural Technology,4(5): 44-47, 2008 and Annul Technical Report.
120,000.00
The study was to identify the range of turbidity of the cited water in order to ascertain their suitability in the wet processing’s of textile industries for remedial measure. To monitor the quality of the product goods and to save the life of the industries machineries turbidity of the used water might be within the allowable limit. From the table it is evident that the turbidity is within the recommended allowable limit. Turbidity higher than the recommended allowable limit for the wet processing’s will affect the quality, texture an uniformity of finished textile products as the turbidity is caused due to the presence of large or small suspended particles of organic or inorganic matter, clay, silt, calcium carbonate, silica, vegetable matter, fats, micro-organisms, industrial waste water, weeds etc. In such cases, remedial measures are solicited and for that purpose the following precaution(s) will be useful.
The materials responsible for turbidity can be removed by direct filtration but if the turbidity is too high, it cannot be very useful to remove by direct filtration only. On that circumstances coagulation will be an effective method. The most common using coagulant for coagulation is Alum where flocculation occurs within the pH range 5.7 to 7.5. After flocculation- sedimentation is to do in a settling tank and then the water is to filter passing through sand or gravel filter. The filtrate water will be useful for wet processings in the textile industries.
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