Abstract
The purpose of the research was to determine the possibility of using a magnetic field as a factor supporting the conditioning of municipal sewage sludge prepared using a chemical method. In order to condition the sludge, PIX 113 iron coagulant or Fe3O4 nanoparticles were used. Two types of organic flocculants: medium cationic Superfloc ® C-494 and high cationic Superfloc ® C-496 were also applied. For the various test combinations a capillary suction time test was performed, the specific resistance to filtration and the final filtration of the filter cakes were determined. For selected combinations, a quality of supernatants analysis was also performed, the measure of which was the COD values. The results show, that in the dual chemical conditioning method, the use of PIX 113 coagulant was more favorable than the nanoparticles Fe3O4. The influence of a magnetic field on the susceptibility to the dewatering of the tested sludge was variable, depending on process parameters such as the flow direction and flow rate through the solenoid. The type of polyelectrolyte used in the conditioning method with magnetic field action was also significant.
Highlights
The municipal infrastructure, including a sewage network, is an element of a wider system referred to as water and wastewater management
On the basis of the capillary suction time (CST) test (Table 3), it should be noted that the sludge dual-conditioned using PIX 113 coagulant was characterized by a lower capillary time compared to thesamples prepared exclusively with polyelectrolyte
The effect of the magnetic field on the CST values was variable, the most favorable results were noted for sediments conditioned with PIX 113 ferric coagulant and polyelectrolyte C - 494, in the C1combination
Summary
The municipal infrastructure, including a sewage network, is an element of a wider system referred to as water and wastewater management. An element of this system is the wastewater treatment plant, which reduces the negative impact of pollution on the environment. Wastewater treatment is a waste process that generates sewage sludge. In its original form, is even over 99%. This determines a large volume of sludge, thickening and dewatering are key processes in sludge management. Conditioning methods are generally methods that limit the strength of water binding to solid phase particles, including structuring or oxidizing agents [2 - 4]. A chemical conditioning method basedon the dosing of polyelectrolyte is commonly used [5, 6]
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