Cleveland Biotech Ltd.

Pumping wells & sewage lines case study

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Courtesy of Cleveland Biotech Ltd.

Dorset Council - Bioremediation of Sewerage System

The Dorset Municipality situated in the North East of Tasmania covers an area of 3196 km2. It comprises 14 townships, 10 water schemes and reticulated sewerage schemes for its two largest townships, Scottsdale and Bridport. Their populations are 1922 and 1234 respectively. Bridport’s population increases to approximately 6000 over the summer period as it is a popular tourist destination. Both reticulation systems have been in operation for some 25 years with only minor maintenance procedures undertaken over this time.

Bridport
The sewerage reticulation system comprises a pipe network ranging in size from 100 mm to 300 mm diameter and three pump stations, the final of which conveys effluent via a 300 mm rising main to the treatment lagoons.

Bridport Sewerage Scheme Objective

  • Reduce fat and grease build up in pump stations and mains

Innoculation Process
Following consultation with BioRemedy Pty Ltd the following dosing protocol was adopted for the Bridport Sewerage reticulation network. The Cleveland Biotech product Amnite S300 was supplied by the local distributor to BioRemedy Pty Ltd who act for them in Southern Australia.

  • Install a 900 mm Bactube (To take a 3Kg Backsoc of Amnite S300) into Pump Station No 3. Refill on a 6 weekly basis.
  • Dose 200 litres of grown up bacteria (5 Kg Amnite S100) at 3 weekly intervals into Pump Station No 3 (effluent from Pump Station No 3 flows to Pump Station No 2 and then to Pump Station No 1, alleviating the requirement for individual dosing)
  • After several weeks, dose grown up bacteria ( Amnite S100) into manholes, to biologically clean gravity sewers throughout the network.
  • During the process chlorine dosing at No 1 pump station was to be abolished.

Dosing commenced in mid December

Observations
Fat and grease were noticeably removed from the pump stations and network manholes. Periodic line blockages due to fat and grease build up in lines was eliminated. Initially small segments of fat, presumably lifted from gravity mains, were noticed in pump stations No 1 and No 2. No adverse effects (odour) were detected following the removal of chlorine dosing.

Bridport Lagoons
The Dorset Municipality situated in the North East of Tasmania covers an area of 3196 km2. It comprises 14 townships, 10 water schemes and reticulated sewerage schemes for its two largest townships, Scottsdale and Bridport. Their populations are 1922 and 1234 respectively. Bridport’s population increases to approximately 6000 over the summer period as it is a popular tourist destination. Both reticulation systems have been in operation for some 25 years with only minor maintenance procedures undertaken over this time.

Bridport
The sewerage reticulation system comprises a pipe network ranging in size from 100 mm to 300 mm diameter and three pump stations, the final of which conveys effluent via a 300 mm rising main to the treatment lagoons.

The primary and secondary lagoons are of 0.8 and 0.4 hectares in area respectively, with a depth of 1.3 metres. Outfall is to ocean

Bridport Sewerage Scheme Objective

  • Reduce sludge build up in primary lagoon
  • Improve the quality of the final effluent being discharged from the lagoons

Prior to the commencement of the lagoon treatment process, negotiations took place with the Department of Environment and Land Management. Subsequently a monitoring programme was adopted to quantify the changes in pollutant concentrations as a consequence of the addition of Amnite S100 into the primary lagoon and the upstream treatment of the sewerage reticulation system with Amnite S300 and Amnite S100.

Dosing commenced 17th December

Observations
Following dosing, considerable bubbling and rising of the sludge mats was observed. The mats quickly dispersed and were not odorous. Bird life continued throughout the lagoon treatment process with no adverse effects. A sludge survey prior to the commencement of dosing indicated an average sludge depth throughout the lagoon of 350 mm with a total of 2870 m3. A follow up survey 5 months after initiating the bio-remediation process indicated sludge depths throughout the lagoon had decreased to an average depth of 144 mm to total 1180 m3, a reduction of 60%.

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