Wastewater Treatment
We use Geotubes for wastewater treatment. They are arguably the most cost-effective mobile primary treatment system available in NZ, well suited for wastewater from the likes of wineries, dairy farms, feedlots, aquaculture sites, vegetable washing and dairy factories.
How we do it
Geotubes are central to Southwater's waste water treatment systems. They are arguably the most cost effective mobile primary treatment system available in NZ, well suited for waste water from the likes of wineries, dairy farms, feedlots, aquaculture sites, vegetable washing and dairy factories.
They are easily set up as a primary or emergency septage treatment to divert the toxic load from standard sewage ponds. This simple technology is cost effective if there is adequate space (to place the required bag capacity) and the bags can be left on site to allow dewatering to the target dry matter %. The expected flow and solids % are determined via a sample grab from the target flow or sludge.
A jar test determines the appropriate treatment to effect separation of the solids and water in the flow. The extracted waste water is pumped via the dosing point into the bag(s) set up on a flat lay down area. The separated water filtrates out of the bag via the 420 micron pores. This clear water is discharged as permitted. The retained solids remain contained in the bag and over time dewater to the target dry matter %. Once achieved the solids are taken to landfill, capped or spread to land as permitted.
Where bags are not appropriate due to available food print or the nature of the wastewater we revert to our colleagues at Sydney based CRS Water. We team up with CRS Water who have a team of process engineers to focus on our NZ projects. CRS have completed numerous wastewater systems for clients across Australia. As with their potable water treatment, CRS use standard technologies set up in line ensure the separated water meets discharge requirements and minimize remnant sludge production.
The treatment approach uses a mix of chemical, biological and mechanical processes to remove and stabilise suspended solids, organics and nutrients. Southwater works closely with the local client from the original project scoping through to installation, commissioning and ongoing warranty and support.
