Econo-Treat VBB C-2200-2
Waipapa Tanks Econo-Treat® VBB C-2200-2 submerged fixed film media treatment unit. Rated design capacity 2,200 litres/day. Total liquid volume 8,280 litres (primary treatment 4,500 litres; secondary treatment aeration 3,230 litres, clarification and recirculation 300 litres, pump chamber 250 litres). Emergency storage 2,120 litres. No tertiary treatment (such as UV disinfection) is incorporated.
Test Flow Rate
The Waipapa Tanks Econo-Treat® VBB C-2200-2 was tested at 1,000 litres/day (equivalent to servicing a 3-bedroom 5 person household) over an 8 month (35 week) period November 2008 to July 2009 followed by a 1 month (4 week) high load effects test involving 5 days at 2,000 litres per day followed by 1,000 litres/day over the following 3 weeks.
Testing and Evaluation Procedures
A total of 37 treated effluent samples of organic matter (BOD) and suspended solids (TSS) at generally six day intervals during weeks 9 to 35 were tested and evaluated as to meeting the secondary effluent quality requirements of the joint Australia/NZ standard AS/NZS 1547:2000.
A total of 16 treated effluent samples of organic matter (BOD5), suspended solids (TSS), total nitrogen (TN), ammonia nitrogen (NH4-N), total phosphorus (TP) and faecal coliforms (FC) at generally six day intervals during weeks 23 through 35 were benchmarked and rated on their median values. In addition, the energy used by the treatment system was assessed on the mean of consumption levels over the 16 sample days, weeks 23 to 35.
Meeting AS/NZS 1547:2000 Secondary Effluent Quality Requirements
The standard requires that 90% of all test samples must achieve a BOD of < 20 g/m3 and TSS of < 30 g/m3.
The Waipapa Tanks Econo-Treat® VBB C-2200-2 system achieved a performance level of 100% for BOD and 94% for TSS and thus met the secondary effluent quality requirements of the Standard.
For full details download the performance certificate here.