Water & Wastewater Asia Mar/Apr 2018

WATER & WASTEWATER ASIA March / April 2018 TECH ROUND UP / 57 Lord Howe island An env i ronmental l y f r i end l y and cos t - efficient wastewater treatment system is being engineered by AustraliancompanyCST Wastewater Solutions for smaller, remote and ecologically sensitive community, municipal, a g r i b u s i n e s s a n d industrial applications throughout the Asia- Pacific region. he two-stage systemuses a combination of coarse and fine screening and advanced dry compaction technology to produce a more hygienic and compact output that is easier to handle and transport. More economical; compact; energy efficient and uses minimal water, thenewsystem– incorporating the world’s best technology into an Australian engineered package – has been selected for use by the Island Board of World-Heritage listed Lord Howe Island after extensive testing to determine the best solution for the management and disposal of waste generated on the island. The existing waste management facility for the Island, 900 km off the coast of eastern Australia, sorts various waste streams including food waste, paper and cardboard, green waste, recyclablematerials re- usable materials and general waste. Septic waste from residential and commercial system is also treated at this facility, drawn from about 220 wastewater systems on the island, 25 of which are commercial operations. Currently, pump outs are delivered to the facility via a 1,800 litre wastewater tanker. “CST Wastewater Solutions was tasked to review a “best fit” sludge dewatering system for the septic waste, because the current infrastructure is becoming outdated and the existing drying beds are to be decommissioned,” said CST Wastewater Solutions Chemical Engineer and Managing Director Michael Bambridge. Bambridge and his brother, Peter, worked extensively with the Lord Howe IslandBoard’s projectmanager to find an optimal solution that combine outstanding environmental performance with equally strong OHS performance – and which has a much smaller footprint than the current drying rack system. “The extensive work done by Peter with the Lord Howe Island Board’s project manager inspired us to take a fresh look at the type of environmental solutions on offer to communities and industries in environmentally-sensitive locations throughout the Asia-Pacific,” said Bambridge. A new two-stage system was proposed: • The first stage is a CST Screen Extractor with coarse screening at 6.0mm up front to remove p l a s t i c , r a g s a nd o t h e r disposals typically found in community, commercial and industrial wastewater treatment plants. • The second stage employs CST’s new KDS Separator technology for fine screening and dewatering of the fines. The clog free a u t o m a t i c l i q u i d - t o - so l i d was t e sepa r a t o r i s i n t r oduc ed t o t he As i a - P a c i f i c r e g i o n b y CS T Was tewater So l ut i ons for