Mechanical mode floating medium filters for recirculating systems in aquaculture for higher solids retention and lower freshwater usage

Steicke, C., Jegatheesan, V., and Zeng, C. (2007) Mechanical mode floating medium filters for recirculating systems in aquaculture for higher solids retention and lower freshwater usage. Bioresource Technology, 98 (17). pp. 3375-3383.

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The aim of this work was to develop a better understanding of a floating medium in a mechanical filtration mode. The experiments were carried out using a commonly available polystyrene floating medium filter with the grain size of 1 mm. A sand medium filter with the similar grain size was also tested for the comparison. A short-term trial of 2 h and a long-term of 20 days filtration times were conducted with three custom manufactured pressurized filters of 16 l. The filters were operated under three different configurations: (i) upflow with floating media (UFMF), (ii) downflow with floating media (DFMF) and (iii) downflow with a sand medium (DSF). The results of the long-term trial indicated that at a flow rate of 22 m/h, the UFMF and DSF had similar solid removal capacity with an average total suspended solids (TSS) removal efficiency of 60%. The DFMF could only remove 33% of TSS. However, during the short-term trial, TSS removal efficiency of the UFMF was better compared to the DSF (e.g., 71%, 56% and 57% of TSS removal in UFMF compared to 66%, 49% and 41% in the DSFF at the flow rates of 20, 25 and 31 m/h, respectively). The energy requirements of each filter were compared by measuring the pressure differential across each filter. The long-term trial indicated that the UFMF had a significantly less pressure differential (44 kPa) compared to the DSF (80 kPa) (p < 0.001). This was further confirmed that at different flow rates whereby the DSF displayed higher pressure differentials for filtration rates at 350, 450, 550 and 800 l/h.

The study indicated that floating medium filter was better and more applicable to recirculating aquaculture systems than conventional pressurized sand filter.

Item ID: 2724
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: floating medium; mechanical filter; polystyrene; solid removal
Date Deposited: 31 Aug 2009 07:25
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 60%
05 ENVIRONMENTAL SCIENCES > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified @ 40%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 100%
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