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Sludge dewatering with different coagulants; Comparison between sludge from Heerenveen and Garmerwolde

Sveistrup, M.J. (2013) Sludge dewatering with different coagulants; Comparison between sludge from Heerenveen and Garmerwolde. Bachelor's Thesis, Chemistry.

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Experiments are done on lab scale with sludge from Garmerwolde and Heerenveen. The goal was to determine important differences between the sludges and coagulants. Garmerwolde sludge had a darker colour than Heerenveen sludge. It was also seen that Heerenveen sludge contained much more pollutions such as twigs and hairs. The odour of Heerenveen sludge was also much stronger. These differences can be explained by the fact that Garmerwolde sludge is digested and the organic material is therefore lower. An optimum dry solid content for Garmerwolde was not reached yet but with a dosage of 167.5 g/kg sludge DSC, a dry solid content of 30% could be reached. However this dosage is too high to use it in practice. In the case of Heerenveen there was an optimum dry solid content with a dosage of 88.5 g/kg sludge DSC. With this dosage a dry solid content of 27% is obtained. An improvement of the dry solid content is not acquired with the use of magnesium salts as coagulant. With both sludges it was seen that manually dewatering using a filter, was difficult. There were more flocs formed with MgCl2 but still the water was more unclear than using FeCl3. Probably the settle time needs to be increased if higher dry solid contents should be reached. Both sludges require a suitable dosage of coagulant and flocculant. Wrong amounts of coagulant and flocculant cause too large flocs. When the flocs are too thick, the sludge cake will be thicker as well because dewatering is difficult and the filtration resistance will increase. When the dosage of coagulant and flocculant is too low, it is not possible to obtain a sludge cake at all because of the absence of flocs.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Chemistry
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 07:53
Last Modified: 15 Feb 2018 07:53

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