In this first stage of completion, two Wash Press WAP® SL 12 units with a throughput capacity of 15 m³/h raw screenings each (redundant design) were installed successfully. The Wash Press units are fed via a launder channel system. The great advantage of this system is that complex transportation ways can be designed very easily and with a high operating reliability. The flushing water is also used as wash water for the Wash Press. The HUBER Launder Channel for complex transportation ways, type HLC, ensures reliable feeding of the WAP® SL wash presses. The very high screenings treatment standards are fully met with 35% DS content being achieved with < 20 mg BOD / g DS.
Phase 2: Main Inlet Works
After the successful completion of the stormwater tunnel project the client’s next task was to look at upgrading the main inlet works at this site. Based on the outstanding success of the HUBER WAP® SL units installed, the end-client was happy to work with HUBER to engineer a solution to meet both a high flow requirement as well meet very tight and difficult hydraulic constraints on site.
Managing the large elevated structure, as well as meeting the requirement to phase the installation, was of paramount importance to the client. If this was not undertaken correctly then severe overtopping and pollution issues could arise. Different design options were presented to the client, and after numerous site visits and design review meetings a solution was eventually agreed. This comprised of the supply of 6 off RakeMax® screens, 2,152 mm wide, 50 mm bar spacing coarse screens, followed by 6 off EscaMax® 2,252 mm wide, 6 mm perforated plate fine screens with each bank of screens having dedicated duty / standby WAP® SL size 12 screenings handling units installed (4 off in total) each unit, uprated to give a maximum of 15 m³/hr raw screenings. Like in first project phase, a launder channel system is again used to remove the screenings into the Wash Press units.
The phased installation and commissioning of the units is well underway and is due to be complete very soon. The work so far has gone to plan and the feedback from the first phase of the installation shows the project is a great success.