This electro/pneumatically powered open trough type HYCOVER rotary distributor is the largest in their range of open trough type machines that Sewaco Ltd have designed and manufactured in their 40 years of trading. This marks a big step forward in the Company’s ability to supply the UK wastewater sector with efficient and reliable machines for their ever larger plastic media type bio-filtration filters to treat urban waste water on smaller footprints.
Mineral media provides 40m3/m2 and is normally packed to 1.5m deep. Plastic media in this filter is packed to 6.0m with media that has a surface area of 125m3/m2, enabling 12.5 times more effluent to be treated per 1m2 of the footprint occupied by the biofilter.
The 31.5m diameter Biofilter contains some 4,669m3 of modular plastic media upon which to grow the micro organisms that convert the soluble organic contaminant to living cells thus reducing the downstream pollution entering our rivers. Periodic slow speed flushing of the media pack to flush out excess biomass is automatically achieved by the specially designed variable speed drive and associated local motor control system which has a data link interface with MCC SCADA control system.
This HYCOVER distributor is capable of handling up to 503 l/sec (43,459m3/hr or 6,640 imp g.p.m.) and applying this evenly over the plan of the media pack, within a range of +/-10%, throughout the full range of incoming flows.
The machine is powered by 2 (No.) 0.25kW electric motors with variable speed control to regulate its rotation speed between 0.306 and 0.03 r.p.m, supplied by Drive Systems Ltd.
The range of Spülkraft values or SK for normal flows range from 21-210mm per pass. At maximum flows the SK range is 31-310mm per pass. The machine has a design life of 27 years with an operational weight of some 21.5 tonne.
This HYCOVER distributor is designed without any horizontal wires this is due to the unique structural design of the arm meaning that it can with stand the considerable compressive forces without distortion. The irrigation arms are fitted with reversing scoops to control rotational speed in the event of power loss to the control system, the rotary distributor reverts to reaction drive.
