Camellia Remediation

The Camellia precinct — associated with the Parramatta Light Rail project — required management of surface water contamination from past industrial processes. SciDev designed, constructed and operated a temporary water treatment plant (TWTP) that removed hexavalent chromium and other metals from surface water on site, treating it down to a non-detect limit of reporting and discharging the water to sewer in accordance with the client's trade waste agreement.

Summary

• Design, construct, and commission a TWTP capable of treating up to 200 m3 of contaminated water in a 24-hour period.
• Coagulation, flocculation, and reduction were used for pre-treatment prior to the dewatering and filtration stages.
• The temporary water treatment plant treated over 39ML of water contaminated with total chromium levels as high 4.2mg/L and hexavalent chromium as high as 2.46mg/L.
• TWTP generated 6m3 of restricted solid waste (RSW), equating to 0.0154% of the total volume processed. This waste was sent to an appropriately licensed landfill and no waste required thermal treatment.
• Highest volume treated in a day was 272.3m3, an increase of 36% in the system design flow rate.
• Discharge to trade waste below the limit of reporting: total hexavalent chromium <0.001mg/L.
• Total of 3ML of sludge was dewatered and treated across the project’s lifetime.