Treatability Study of Tannery Effluent by Conventional Activated Sludge Process and Activated Sludge Process using Medium

 
 
International Journal of Biotech Trends and Technology (IJBTT)
 
© 2013 by IJBTT Journal
Volume - 3 Issue - 4                          
Year of Publication : 2013
Authors :Saritha Banuraman, Veda Madavan, Silari Venkatesh

Saritha Banuraman, Veda Madavan, Silari Venkatesh "Treatability Study of Tannery Effluent by Conventional Activated Sludge Process and Activated Sludge Process using Medium",International Journal of Biotech Trends and Technology (IJBTT), V3(4):1-6 October - December 2013. Published by Seventh Sense Research Group.

Abstract

The characteristics of tannery effluent vary considerably from tannery to tannery depending upon the size of the tannery, chemicals used for a specific process, amount of water used and type of final product produced by a tannery. The project is carried out with PVC spiral medium to observe the effect of Activated Sludge Process(ASP) on BOD and COD mainly. The experimental process involves the conventional Activated Sludge Process (ASP) that uses air (oxygen) and microorganisms to biologically oxidize organic pollutants producing a waste sludge containing the oxidized material. The study is conducted by following two methods: a)ASP without medium and b)ASP with medium (PVC Spirals). The tannery effluent measuring three litres and half litre of return sludge was filled in the aeration tank and was aerated in the aeration tank where air (or oxygen) is supplied for regular intervals of 4, 6, 8, hours respectively and allowed for settlement in a sedimentation tank for one hour. A settling tank (usually referred to as a “clarifier”) is used to allow the effluent sludge to settle. Part of this sludge is recycled to the aeration tank for initial growth of micro organisms in it. This part of sludge is known as return sludge. And the remaining sludge is removed for further treatment and ultimate disposal. Testing of different parameters like BOD, COD,Total Solids and Turbidity were carried out on the samples aerated with different aeration time, with and without medium and consequent results were found. In the presence of PVC Spiral medium, the concentrations of various parameters considered for study were found decreased when compared with the values of concentration found without using any medium.It is very clear that PVC Spiral medium contributes more to the surface area which is very essential for the growth of micro organisms for effective removal of pollutants from the effluent.

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Keywords
Tannery effluent, Activated Sludge Process, PVC Spiral medium, BOD, COD, Total Solids, Turbidity..