Installation of Advanced Wastewater Treatment Plant at Alsco’s Adelaide Facility
Alsco is an International industrial laundry company operating plants in most states of Australia. In late 2019 Hydroflux Industrial was asked to install a wastewater treatment plant in their Adelaide facility, located approximately 3.7km from the Adelaide CBD. Due to Covid completion was delayed till early 2022.
The sites original treatment plant was simply a 160kL (nom.) below ground collection/balance tank, unmixed, with a submersible pump discharging to sewer via a flow meter and pH monitoring. The net result was an untreated sewer discharge, and a below ground tank that became a collection pit for settled solids, with the tank requiring period draining for solids removal by a sucker truck.
Alsco were notified by SA Water that a treatment plant was required for removal of O&G, solids and a reduction of BOD.
Hydroflux proposed and install the following process and equipment:
- Submersible Jet style aerator/mixer in the balance tank to prevent the solids from settling, as well reducing the chances of the water going foul
- The existing submersible pump to sewer removed and replaced with duty/standby progressive cavity pumps feeding a Hydroflux HyDAF HD35.
- Coagulant was pump to an inline flocculator, followed by acid for pH correct, prior to the infeed of the DAF. The inline flocculator was used in preference to a reaction tank due to an initial lack of space.
- Polymer fed from a Hydroflux Hydroblend was injected into the effluent stream along with the dissolved air (recycle) at the entrance to the DAF
- The solids and O&G removed by the DAF as sludge is pumped via a slow speed diaphragm pump to a mixed sludge tank.
- Clarified DAF discharge water is pumped to the original sewer discharge line, via a new pH monitor, flow meter and sampling point required SA Water.
- The collected sludge is dewatered with the addition of polymer from the same Hydroblend in a Hydroflux CakeMax 120L automatic Chamber Filter Press. The filtrate going direct to sewer with the DAF discharge, and the compressed sludge cake being disposed of as solid waste.
- The entire process is controlled via a central MCC, with HyConnect remote monitoring installed.
