Sewage treatment and monitoring

ENVIRONMENTAL MONITORING

Review of Environmental Monitoring Programs - Dubbo Sewage Treatment Plant, Ballimore and Wongarbon (Pine Avon)

Review of Environmental Monitoring Programs (PDF 1.3MB)

 

OPERATIONAL ENVIRONMENTAL MANAGEMENT PLAN FOR SEWERAGE SERVICES

Council provides sewerage reticulation and treatment services to 32,537 Dubbo residents and 687 Wongarbon residents. Sewage is transferred from the residential properties, through a series of pipelines and pump stations to the Dubbo and Wongarbon Sewage Treatment Plant.

 An Operational Environmental Management Plan (PDF 1MB) has been prepared to document the following:

  • Regulatory requirements
  • Management system components including reporting, document control, training, complaints and review, and
  • Environmental risk identification, monitoring and management strategies associated with the sewer operations.   


   

ENVIRONMENTAL DISCHARGE MONITORING

Dubbo Regional Council's Sewage Treatment Plants are licenced by the NSW Environment Protection Authority.

Dubbo Sewage Treatment Plant - EPA Licence 3850 (PDF 143.7KB)

Wellington Sewage Treatment Plant - EPA Licence 3370 (PDF 140.6KB)

 

Effluent leaving the Sewage Treatment Plants are monitored in accordance with the terms of the licence. Licencees are required to publish pollution monitoring data that has been collected as a result of a licence condition, in accordance with section 66(6) of the POEO Act and written requirements issued by the EPA.

 

Dubbo Sewage Treatment Plant

The Dubbo Sewage Treatment Plant has two discharge points. The documents below refer to Point 1, which is the point of discharge to the Macquarie River. The monitoring frequency for this point is weekly when it is necessary to discharge effluent to the River. 


Sewage Treatment Plant Point 1 - 2017/2018 (PDF 196.1KB) 

Sewage Treatment Plant Point 1 - 2016/2017 (PDF 249.3KB) 

Sewage Treatment Plant Point 1 - 2015/2016 (PDF 232.8KB)

Sewage Treatment Plant Point 1 - 2014/2015 (PDF 297.4KB)

Sewage Treatment Plant Point 1 - 2013/2014 (PDF 317.2KB)

 

 

Point 2 refers to monthly discharge of effluent to effluent irrigation. The licence does not state acceptable ranges for pollutants at this Point. Note that fewer pollutants are required to be monitored at Point 2 as compared to Point 1.

 

Sewage Treatment Plant Point 2 - 2017/2018 (PDF 180.7KB) 

Sewage Treatment Plant Point 2 - 2016/2017  (PDF 204.3KB)

Sewage Treatment Plant Point 2 - 2015/2016 (PDF 190KB)

Sewage Treatment Plant Point 2 - 2014/2015 (PDF 200.7KB)

Sewage Treatment Plant Point 2 - 2013/2014 (PDF 203.7KB)

 

WELLINGTON Sewage Treatment Plant

The Wellington Sewage Treatment Plant has three discharge points. The documents below refer to Point 1, which is the point of discharge to Bushranger Creek. The monitoring frequency for this point is monthly.

Wellington Sewage Treatment Plant Point 1 - 2017/2018 (PDF 189.7KB) 

Wellington Sewage Treatment Plant Point 1 - 2016/2017  (PDF 207.8KB)

Wellington Sewage Treatment Plant Point 1 - 2015/2016  (PDF 196.1KB)


Point 3 is the discharge downstream, and Point 4 upstream of the confluence of Bushranger Creek and the Macquarie River. The monitoring frequency for both points is yearly. 

Wellington Sewage Treatment Plant Point 3 & 4 (PDF 181.4KB)

Pollution Incident Response Management Plan (PIRMP)

Council has developed a Pollution Incident Response Management Plan (PDF 182.3KB) (PIRMP) that will guide Council's response in the event of any pollution incidents that may occur at the Dubbo Sewage Treatment Plant.

Sewage Treatment

The following table indicates some parameters of sewage received at the Dubbo Sewage Treatment Plant, called "influent", and the quality of the water after treatment, when it leaves the plant, called “effluent”.

Parameter Unit   Typical Influent  Typical Effluent
Total Coliforms cfu/100 mL 22,000  12,736 
Faecal Coliforms cfu/100 mL 1,180   216 
E Coli cfu/100 mL 1,032   205
pH 7.5  8.9
Electrical Conductivity µS/cm 1,280   929 
BOD – 5 Day mg/L 154   2.9
COD mg/L 389   38.6 
Chlorophyll ‘a’  µg/L   2  27.5 
Ammonia – N mg/L  35   0.25 
Nitrogen – Oxidised mg/L  1.89   1.17 
Nitrogen – Total Kjeldahl mg/L  1.4   1.35
Nitrogen – Total mg/L  54   2.51
Phosphorus – Total mg/L  9.2   4.48
Suspended Solids mg/L  169   6.71
Oil and Grease mg/L  <2   1

The unit “cfu/100 mL” refers to the number of colony forming units in a 100 millilitre sample. It is a biological measure of viable bacterial cells in the water.

Electrical conductivity is measured in units of micro Siemens per centimetre (µS/cm). It is an indication of the amount of nutrient, impurities or salts in solution.

Last Edited: 13 Nov 2017

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