Licence conditions for pollution studies and reduction program


  

Licence conditions for pollution studies and reduction programs

Summary
 
Licence number: 4435
Title: Pollution Reduction Study (PRS) 13 - Review of UV Disinfection System
Start date: 16 Aug 2016
 
Licence Condition
Background Over a period of years the EPA has been encouraging the licensee to implement effluent reuse as a means to minimise impacts on the receiving environment and provide a more sustainable operation. In response to these concerns and in addition to the PRP 10 studies the licensee commissioned consultants to conduct more detailed receiving environment investigations. In summarising the findings of studies on the receiving environment the licensee has advised that the Tanilba Bay Sewage Treatment Plant (STP) has had a minor impact onTilligerry Creek and Lemon Tree Passage oyster leases and the NSW Food Authority has confirmed to the licensee that the STP is considered a low risk to the oyster industry due to multiple barriers in place, including UV disinfection, dilution within the ponds and residence time within the aquifer. The licensee has also summarised the findings of the investigations noting the ponds have had a minor environmental impact on the receiving environment and effluent reuse is not necessary. The licensee has therefore decided against effluent reuse in the area but to upgrade the STP to achieve greater reliability and a higher level of effluent quality. Upgrade works identified by the licensee as necessary include upgrade of the UV disinfection plant; decomissioning the existing sludge lagoons, constructing a new sludge tank, reinstating the second bioreactor tank and augmenting the inlet works.
Deliverables Note:  these deliverables including due dates to complete aspects of the upgrade will be added to the licence upon completion of Pollution Reduction Study 12
Deliverables  The licensee must systematically review the UV disinfection system at the premises. The review must include, but need not be limited to: Verification of existing installation against design performance criteria; Assessment of system reliability in the event of equipment and/or power failure; Assessment of redundancy levels of the UV system and associated equipment; Assessment of control philosophy and alarms; and Assessment of operating and maintenance tasks. A report outlining the findings of the review and the proposed measures to improve the performance of the UV system and reduce the risk on non-compliance with Environment Protection Licence conditions must be submitted to the EPA via email to hunter.region@epa.nsw.gov.au by no later than 31 October 2016.