New M.E. Thesis Submitted from IND. Student

STUDIES ON SOME ENVIRONMENTAL CONSERVATION STRATEGIES IN A COMMON EFFLUENT TREATMENT PLANT FOR A LEATHER CLUSTER By P. S. Suresh Kumar,Industrial

Abstract
Leather industry occupies a place of prominence in the socio-economic firmament of the nation in view of its substantial export earnings and employment generation. There are more than 2000 tanneries located in India with a total processing capacity of 700,000 tones of hides and skins per year. Sustainability of tanneries, particularly the small and medium scale enterprises (SMEs), is difficult because of alarming levels of environmental pollution caused by various tanning operations and practices. Common Effluent Treatment Plants (CETPs) were the cost effective option for compliance with the effluent discharge standards for SMEs in industrial clusters. CETPs require considerably large amounts of energy to transport, treat and discharge treated effluent and also emit huge amount of green house gases (GHGs) directly and indirectly to the environment.
In the present study, three CETPs operating in Tamilnadu at Ranipet, Vaniyambadi and Dindigul have been taken up for the energy conservation and its impact on global warming potential. Further the sludge handling at these CETPs has also been studied for environmental conservation view point. These CETPs were having conventional treatment units (open anaerobic lagoons) followed by aerobic system. The energy consumption for different treatment stages have been analyzed for all three CETPs. After identifying the energy intensive operations in the selected CETPs, alternate energy saving equipment and improved treatment schemes have been designed and selected for the same. The CETPs have been upgraded with Central Leather Research Institute, India as technical agency on turnkey basis. It is seen that the CO2 emission reduction by upgrading the equipment in equalization tank is 53% and 13% for CETPs at Ranipet and Vaniyambadi, respectively. It was also observed that conversion of anaerobic lagoon to UASB in Dindigul CETP has earned 2400 Carbon emission reductions (CERs). The CERs earned by dewatering of sludge using chamber filter press instead of conventional sludge drying beds is around 45% for both the CETPs at Ranipet and Vaniyambadi.



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