Knowledge Globalization Conference, 13th International Knowledge Globalization Confernece 2018

Font Size:  Small  Medium  Large

EFFECTIVENESS OF TEA RESIDUES TO MANAGE HEAVY METAL TOXICITY FROM INDUSTRIAL WASTEWATER

MD AZHARUL ISLAM, Ummay Habiba, MD Aslam ALI

Last modified: 2018-01-11

Abstract


Most of the chemical, plastic, paper and food related industries are running in BSCIC area of Mymensingh district. The residues of these industries use a large amount of water by discharging effluents into the streams and rivers by polluting nearby water resources. An experiment was conducted under lab condition during the period from January 2017 to August 2017 to investigate the physicochemical characteristics of industrial effluents and also to observe the effectiveness of tea residues for managing heavy metal pollution in samples. The adsorption of heavy metals on tea residue was studied by batch technique with the help of AA-7000 spectrophotometer. There were ten treatments namely: T0 denotes raw water (untreated water), T1: 2g TR (tea residue) at 1 day after added, T2: 2g TR (tea residue) at 7th dat after added, T3: 2g TR (tea residue) at 15th dat after added, T4: 5g TR (tea residue) at 1 day after added, T5: 5g TR (tea residue) at 7th dat after added, T6: 5g TR (tea residue) at 15th dat after added, T7: 10g TR (tea residue) at 1 day after added, T8: 10g TR (tea residue) at 7th dat after added, T9: 10g TR (tea residue) at 15th dat after added. Water samples were collected in distinct four sampling sites. The physicochemical parameters like color, odor, pH (7.6-8.64), TDS (180-533ppm), EC (425-1692µs) and the concentration of Zn (1.861, 2.802, 3.618ppm), Cr (3.966, 2.036, 1.589ppm), Pb (6.351, 1.076, 2.789ppm) were reported. The pH and TDS were within the standard level but the EC were found much higher at S3 sample. Most of the chemical industries were situated near the S1, S2 and S3 sampling sites and near S4 sites food industries were located. From the study it was found that the concentration of heavy metals like Pb, Cr and Zn of S1, S2, S3 were higher but only S4 cannot find any toxic or traces elements. Results revealed that T8 and T9 showed the highest Zn removal rate than other treatments, where T1 treatments showed lower rate. The highest removal rate of Pb concentration showed at T9 and T6 treatments and lowest removal rate at T7 treatments for all three samples. The concentration of Cr showed higher removal rate at T9 treatments for S1 sample, T8 for S2 and T6 for S3 sample but all three samples were not so effective at T1 treatments. From the points of the view of multipurpose utilization and environmental protection, utilization of tea residues is important significance. The results may concluded that using of tea residue may very helpful to minimize the metal pollution level for sound environment.