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Tannery Sludge Case Study

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increasing with extensive of industrial developments. The tannery sludge purification is still today a theme of a large interest. Nowadays, treatments involving depuration technologies allow to obtain effluents with chemical-physical characteristics in respect to the environmental existing standards. From the traditional wastewaters treatments, huge amounts of sewage sludge are produced. Specifically, after the biological treatment wastewaters still contain organic pollutants which are not degradable called as recalcitrant compounds. These pollutants agents are removed using chemical-physical processes that produce large quantity of sludge. To reduce the production of sludge by these wastewaters tertiary treatments new systems must thus be explored.
During the past few years, photocatalysis has been …show more content…

The COD of the samples were calculated using the equation:

Chemical Oxygen Demand reduction (%) = ((C0 – C) / C0) *100

Where Cο is initial COD (mg/L) and C is final COD (mg/l) at a given time.

3. Results and Discussions
The results of various experiment performed are shown and appropriate discussion are made in this section. Table2 shows the different values before and after photo catalytic treatment of the sludge from tannery industry. The optimum working of the catalyst was found to vary with time and the solar exposure. The percentage of COD reduction efficiency was checked in three ranges which was neutral with pH 8, alkaline pH 12.03 and acidic with a pH of 3.04 and was found out. The chemical oxygen demand removal was about 50% in the alkaline range, 77.5% in the natural existing range and about 85% in the acidic range.
Table 2: Results of analysis
Parameters Strength of the solution Before treatment
(mg/L) After the treatment subjected to photocatalysis (mg/L)

COD Alkaline range 1280 640 Natural range 960 258 Acidic range 1280

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