Analysis and treatment of leather industry wastewater
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Date
2016
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Publisher
University of Management and Technology
Abstract
This research work illustrates the analysis and treatment of wastewater of leather industry using agricultural low cost material (rice husk, wheat straw) and animal charcoal. The sample of leather industry wastewater was collected from outlet pipes of the leather industry. During analysis of wastewater it was recorded that wastewater having pH 7.4, and contain high amount of BOD 115mg/L, TSS 740mg/L, COD 456mg/L and also high amount of metals such as Zinc (2mg/L), Lead (2mg/L) and Chromium (0.5 mg/L). These values were much greater than the National Environment and Quality Standards (NEQS) limits. To treat this wastewater wheat straw, animal charcoal and rice husk were used. Rice husk reduced pH to 6.9, TSS to 416 mg/L, COD to 180 mg/L, BOD to 56 mg/L, Zinc metal to 1 mg/L and Chromium metal to 0.1 mg/L which are within NEQS limits. Animal charcoal reduced pH to 6.1, TSS to 360 mg/L, COD to 168 mg/L, BOD to 67 mg/L, zinc metal to 1 mg/l and Chromium metal to 0.1 mg/L which are within NEQS limits. Wheat straw reduced pH to 6.7, COD to 175 mg/L, BOD 78 mg/L, Zinc ions to 1 mg/L and Chromium metal to 0.2 mg/L which are within NEQS limits. These methods were very cheaper and suitable to reduce such high amounts under NEQS limits. The concentration of Iron, TDS and electrical conductivity were also recorded for the wastewater sample but these values were already within NEQS limits.
By using rice husk treatment the percentage removal of metals was recorded as Chromium of 60%, Zinc of 62%, Lead 50% and Iron 75%. By using wheat straw treatment the elimination of Chromium of 52%, Zinc was observed up to 48%, Lead as 53% and Iron as 50%. By using animal charcoal treatment the percentage removal of Chromium, Zinc, Lead and Iron were achieved up to 30%, 15%, 17% and 31% respectively.
Description
Supervised by: Dr. Sohail Nadeem
Keywords
National Environment Quality Standards, leather industry, MS Thesis