Abstract
Toxic odour causes pollution to environment. Removal of odour from wet processing sections of leather tanneries is important to preserve safety and occupational health. Such odour causing gases are identified in nature and are identified mostly as ammonia, Hydrogen sulfide and Volatile organic compounds. These gases, evolving from tanning drums, were experimentally quantified and analysed. Techniques for the abatement of odorous gases are designed using chemical methods. Scrubbing towers based on absorption of gases by liquid are designed and fabricated to evaluate the performance of the system in laboratory scale. Those gases were reduced in the concentration by absorbing through the packed bed vapour phase absorption using the activated carbon as the adsorbent. Results are helpful to conclude that the absorption technique presented here to reduce these toxic emission loads, seems to be simpler and economically cheaper.
Highlights
During the last two decades, cleaner production and pollution abatement have been developed which have made it possible to reduce the pollution load from tanneries
Less number of research are reported on pollution through air emission that give rises to bad odor and causes problem to occupational safety of the workers in Tannery
From the above study it was clear that the adsorption of the toxic gases such as ammonia and H2S are quantitatively reduced by passing through vapour phase adsorption
Summary
During the last two decades, cleaner production and pollution abatement have been developed which have made it possible to reduce the pollution load from tanneries. Gases comes out) and some organic foul gases form hides/skins during processing In tannery, these gases either partly dissolved in process liquor, giving rise to odor or mix with air inside (tannery) and produces bad odor. These gases either partly dissolved in process liquor, giving rise to odor or mix with air inside (tannery) and produces bad odor In the latter case, biofilters, bioscrubbers, activated sludge scrubbers, trickling filter scrubbers, and reactive chemicals are available to suck and remove these bad odorous gases. In the earlier case, suitable technology must be developed which is the objective of this paper These emissions from tannery or effluent treatment plant, generally pollute the air, soil, surface water and underground water, causing serious health problems because they lie within and around residential areas. The limiting steps for removal of ammonia—nitrogen and hydrogen sulphide are studied in production of wet blue hides
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