Reduction Of Heavy Metals Sludge By Vermicomposting Technique
| dc.contributor.author | Ahmed Hamdi, Shaymaa Mundher | |
| dc.date.accessioned | 2018-10-11T01:54:35Z | |
| dc.date.available | 2018-10-11T01:54:35Z | |
| dc.date.issued | 2011-05 | |
| dc.description.abstract | Two kinds of treatments were used in the current thesis, namely, biological and chemical treatments, to reduce the concentration of four heavy metals (Al, Ni, Zn, and Pb) in the sludge collected from the electronic industry. A biological treatment called vermicomposting technique was employed to expose four different ratios of sludge (20, 50, 80, and 100%) mixed with goat manure and rice straw as a composting material to the earthworm species Eisenia fetida for four weeks. The metal concentration exhibited a significant decrease with an increase in time. The best results were obtained at week 4 in reactor 4 (R4) with 100% sludge ratio for Al, Ni, Zn, and Pb; the value of each metal concentration reached 1989.7, 93.5, 347.1, and 10.77 mg metal/kg sludge, respectively. The accumulation of these metals in the body of Eisenia fetida increased with an increase in time, and the best accumulation occurred in R4 with 100% sludge at week 4 was 90.03, 72.2-73, 53, and 52 mg/kg for Al, Ni, Zn, and Pb, respectively. The best reduction capability for the worms for each week (W1, W2, W3, and W4) in four different sludge ratios was exhibited in R4 with 100% sludge was 58.13, 10, 3.2, and 5 mg metal/kg sludge/worm for Al, Ni, Zn, and Pb, respectively. The metals showed insignificant effect on the dry weight of Eisenia fetida body for 8 weeks as the body weight increased positively with time. The positive increase in weight of 58% was exhibited in R2, R3, and R4 with sludge ratios of 50, 80, and 100%, respectively. For the chemical technique, the sludge was washed with a mixture of two reagents (Na2 EDTA and Na2S2O5) at different volumes of washing solution (2.5, 5, and 7.5 mL to 1 g of sludge). The best reduction of heavy metals occurred in 7.5 mL with a percentage reduction of 5%, 12%, 16%, and 24% per gram sludge for Al, Ni, Zn, and Pb, respectively. Based on the findings, the vermicomposting technique shows greater potential over the chemical washing technique in reducing heavy metal concentration in electronic sludge. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/6741 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | Reduction of heavy metals sludge | en_US |
| dc.subject | by vermicomposting technique | en_US |
| dc.title | Reduction Of Heavy Metals Sludge By Vermicomposting Technique | en_US |
| dc.type | Thesis | en_US |
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