CASE STUDY:  Water Quality  Improvement  Project Between 2014 and 2016, DBCT undertook the Water Quality Improvement Project (WQIP). In 2016, the $55 million WQIP project was nominated for the Queensland Premier’s Sustainability Awards and received a Highly Commended award. The objective of the project was to implement a range of initiatives that collectively would significantly reduce the likelihood of water quality exceedances from the DBCT Industrial Dam (ID).   Being the lowest point within the DBCT catchment, the ID collects all recycled operational water and high intensity stormwater run-off from the stockyard and out-loading conveyor systems. With the Great Barrier Reef Marine Park in close proximity and some 70 ha of the finest high-grade coking coal stockpiles sitting within the DBCT stockyard, it was a challenge to maintain the water quality within allowable release limits during high intensity wet season rainfall events. The multi-faceted project provided new infrastructure to increase the ID buffer capacity (to reduce overflows), an increase of 1000 ML of dam storage capacity within the terminal site (to store more water by raising the wall of the existing Quarry Dam and constructing a new Rail Loop Dam), and increased pump transfer rates between the dams. The increase in recycled site water harvested within the dams now also provides more water for terminal dust suppression and operational activities. Improved water quality has also been achieved through the implementation of new coal fines recovery infrastructure that allows for detention, settlement and recovery of the settled coal fines outside the historical wet season. In addition, a flocculant plant was constructed to encourage incoming coal fines to settle out quickly into the ID cells for later removal, thus improving the water quality in the event of a discharge the following wet season. 08 |