If the tannery waste concentration in domestic sewage is higher, the interference with waste treatment operation could be due to: (iv) Higher concentration of sulphides and chromium. Recycling: Where to Start in Reducing Your Waste? The discharge of untreated tannery wastes into water course may also increase the turbidity of water thereby reducing light penetration and impairing photosynthetic activity of aquatic plants. Indiscriminate disposal of liquid and solid wastes generated during tanning operations may also give rise to considerable smell. There is a possibility of hydrogen sulphide generation during deliming from the sulphides sticking to hide if the limed hides are not properly washed. How Solar Roofs Can Minimize The Urban Heat Island Effect? Sorry, your blog cannot share posts by email. Chlorides, trivalent chromium, nitrogen, phosphorous, sulphate, ammonium salts, lime etc., are the inorganic pollutants present in significant quantities. We also use third-party cookies that help us analyze and understand how you use this website. EXTENDED ABSTRACT Effectiveness of Managing Hazardous Waste Generation in Leather Tanning Industry in Sri Lanka S.J.S.Bandara 1, K.H. The word Tanning is derived from ‘Tannin’ which is an acidic chemical compound. Leather Tanning is the process of converting raw hides or skin into leathers and on further treatment they are converted into leather products. The wastewater is discharged from various sectional operations intermittently and it takes its own course to the nearby low-lying area neighbouring land, pond, street, roadside etc. The chrome tanning wastes contain high amounts of chromium mostly in the trivalent form. © 2017 EnvironmentalPollution - All rights reserved, Management of Chromium Wastes in Tanneries. The wastewater from tanyard process viz. 7 Chromium during the treatment to it. and lime sludge from liming pits. The volume of waste water, which contains high levels of alkaline and organic substances, is, of course, correspondingly high. the solid wastes generated by Sheba Leather Industry were carried out so that suitable tannery solid waste management solutions could be proposed. (v) Wet blue to finish – 20-25 1/kg of wet blue weight. Production management. Generation of solid wastes generated during various tanning operations are not properly utilised or disposed they are likely to cause a number of problems. : Some of these solid wastes or by-products find consumers in the gelatine, glue, textile and artificial leather industries. Waste Management, Industries, Tannery Industry, Terms of Service Privacy Policy Contact Us. An average of 35 m3 is produced per ton of raw hide. During soaking, the removal of curing salt and dehydration of the skin introduces the possibility of bacterial growth and protein putrefaction. The sulphide toxicity to fish increase as the pH value is lowered. ... tannery waste disposal on water, soil and agricultural productivity. About 200 tons of solid waste is generated per day during peak sea son and 75 to ns during off-peak season from the tanneries of Hazaribag (Huq, 1990). Hydrogen sulphide and organic sulphides cause odour nuisance when present in the air at concentrations of 10 to 150 times smaller than the lowest concentration of sulphur dioxide detectable by smell. Tanneries discharge into the atmosphere odorous gases, smoke and dust. The leather tanning industry significantly contributes to economy of a country. It may change the characteristics of the soil and interfere with the intake of water by plants. The rest of the hide together with excess processing chemicals and the large volumes of water employed form the solid and liquid residues. In general the toxic effects of chromium salts particularly hexavalent chromium salts towards aquatic life varies with species, temperature, valence of chromium and the complex synergistic and antagonistic effects due to other factors such as hardness. However, the term leather tanning also commonly refers to the entire leather-making process. During the tanning process at least 300 kg of chemicals (lime, salt etc.) The effluent, as for food industries, requires a large amounts of oxygen to reduce the organic matter, but contains chemical reagents which are toxic or … Characteristics of the effluents vary from tannery to tannery and in any one tannery with respect to time. Hair and lime sludge if discharged along with the effluents are likely to choke the drains. 1.5.1 Treatment. The wastewater is made up of high concentration of salts, chromium, ammonia, dye and solvent chemicals etc. In general where tanning industries have long been established there usually has been a simultaneous growth in industries which can use these wastes. The end products of anaerobic decomposition or putrefaction of proteins include indole, skatole, mercaptans and miscellaneous aldehydes, all of which are odorous. But their pollutional contribution is 20%. ASM. The main source of smells in a tannery is the compounds containing nitrogen and sulphur. Besides, new waste is making ways to the open spaces as some leather factories have resumed producing finished leather goods in the area, apparently without any planned waste disposal. to finish – 40-50 1/kg of E.I. Sugarcane Trash – A Wonderful Resource that Indian Sugar Industry is Wasting, Waste Generation in Leather Manufacturing, Biogas from Leather Industry Wastes | Cleantech Solutions, Thermal Conversion of Tannery Wastes | BioEnergy Consult, Solar-Powered Pumps are Game-Changing for Agriculture, The Technology Revolutionizing Commercial Waste Management, Food Waste Management – Consumer Behavior and Food Waste Disposers, Anaerobic Digestion: An Option for Organic Waste Management, Home-produced biogas is a promising, sustainable technology, Why Businesses Need to Reduce Their Carbon Output. The wide variation of BOD, COD, chromium, sulphide and other parametres exhibited in raw to finish composite wastewater is due to the variation in the process, changes in the type, quantity and quality of chemicals used for the process, fluctuations in the volume of water used for process and washings. Toxicity data from the given examples were compared at Table 4, and included the three type of samples. The main solid wastes from tanneries are sawdust, wet-blue shavings (from chrome tanned leather), finished and semi-finished leather cuts, as well as sludge. This field is for validation purposes and should be left unchanged. The pH of the wastewater was adjusted to 5, 6, 7 and 8 by adding acid or base as required. Hydrogen sulphide is an extremely bad smelling gas which can be detected in concentrations as low as 0.1 ppm. Every tanning process step, with the exception of finishing operations, produces wastewater. The water in the low lying areas in developing countries, like India and Bangladesh, is polluted in such a degree that it has become unsuitable for public uses. And lime sludge is obtained as solid wastes generated by the leather tanning technology is polluting... 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