PRODUCTS & Services
Bio-Shell® bioreactors
Upgrade your wastewater ponds at a cost that you can afford. Bio-Shell® bioreactors can extend pond service life for years at a fraction of the cost of alternative technologies.
Developed by University of Utah professors, Kraig Johnson and Larry Reaveley, Bio-Shell®bioreactors’ and Bio-Dome®bioreactors’ award-winning, patented technology consists of concentrically nested shells or domes that are infused with air from the bottom. They sit on the floor of a pond and are completely submerged. Bio-Shell®bioreactors and Bio-Dome®bioreactors are shaped as half cylinders and spheres respectively with key shape modifications to enhance efficiency. Bio-Shell®bioreactors are suitable for pond depths of 1.2m and above with Bio-Dome®bioreactors requiring pond depths of > 2m.
As water flows through the bioreactors from bottom-to-top, beneficial bacteria (bio-films) effectively reduce ammonia-nitrogen, BOD and TSS in wastewater. Unlike other systems, the growth of the naturally occurring bio-films is maximised by the way in which oxygen is optimally guided through the bioreactors by their geometry.
Because the Bio-Shell®bioreactors rely on fixed film, as opposed to suspended growth, they provide reliable nitrification in water temperatures as low as 0.5 ̊C, however nitrification performance varies greatly depending upon temperature. In the future, as the community grows and loading is increased, additional Bio-Shell®bioreactors can be installed incrementally as required in order to ensure compliance.
The key benefits of
Bio-Shells® bioreactors are
Utilises existing Pond Infrastructure in a cost effective manner
- Works in water temperatures down to 1 ̊C
- BOD reduction
- Ammonia reduction
- Denitrification
- Phosphorus Removal
- Modular in design therefore expansion is easy
- Low operational and maintenance cost
- Lowest power consumption in the industry & the only proven technology capable of operating off the grid
- Proven results verified internationally by Wastewater Compliance Systems
- 4 Layer Bio-Shells®bioreactors
6.9 kg/day/unit - 2 Layer Bio-Shells®bioreactors
1.8 kg/day/unit
Suspended Solids Reduction
- 4 Layer Bio-Shells®bioreactors
2.67 kg/day/unit - 2 Layer Bio-Shells®bioreactor
0.7 kg/day/unit
The Bio-Shell®bioreactors system is designed to reduce ammonia nitrogen concentrations at very low temperatures.
- 4 Layer Bio-Shells®bioreactors
0.30 kg/day/unit - 2 Layer Bio-Shells®bioreactors
0.08 kg/day/unit
For the two different Bio-Shells®bioreactors, the air requirements are:
- 4-Layer Bio-Shells®bioreactors
3.5 SCFM/Unit - 2-Layer Bio-Shells®bioreactors
1.0 SCFM/Unit
Have a look at our case studies
Hexa-Cover® Floating Cover
The Hexa-Cover®Floating Cover system is a patented, self-organising system which has multiple benefits when installed on water surfaces. Developed in Denmark, Marshall Projects Limited is the only New Zealand company licensed to supply this unique product.
Since its launch in 2004, Hexa-Cover®Floating Cover has been chosen for a vast number of installations globally and is a proven, market leading solution.
The Hexa-Cover®Floating Cover consists of recycled foamed polypropylene (without use of Freon or other harmful materials) which floats on top of the water surface and can be used on almost all water and wastewater ponds, reservoirs and tanks. Hexa-Cover®Floating Cover is solid and robust and as such offers a long service life free of maintenance, service and repair.
The Hexa-Cover®Floating Cover is certified for use with potable water according to AS/NZS S4020:2018 – Testing of products for use in contact with drinking water.
The Hexa-Cover® Floating Cover is the ideal solution for controlling:
- Odour emission
- Prevention of UV light to stop algae growth
- Evaporation
- Iron and Manganese
- UV effect
Further, the Hexa-Cover® Floating Cover deters unwanted waterfowls from landing on covered waters.
The Hexa-Cover® Floating Cover ensures:
- Up to 99% coverage of the surface area
- Up to 95% reduction of evaporation
- Up to 96% reduction of odour emission
- Noticeable reduction in organic growth
Some of the benefits of the Hexa-Cover® Floating Cover include:
- Ease of installation
- Installation in both full and empty tanks
- Automatic distribution on the fluid surface
- Adapts automatically to changes in the water level
- Fits to all shapes and geometries
- Adapts to changes in water surface area
- Unlimited access to the liquid
- No running costs
- No repair costs
- No maintenance costs
- Needs no supervision
- Unaffected by rain, snow and frost
- Allows use of aeration
- Favourable price
- 10 years warranty
- 25 years expected lifetime
The Hexa-Cover® Floating Cover is the ideal solution for controlling:
- Odour emission
- Prevention of UV light to stop algae growth
- Evaporation
- Iron and Manganese
- UV effect
Further, the Hexa-Cover® Floating Cover deters unwanted waterfowls from landing on covered waters.
The Hexa-Cover® Floating Cover ensures:
- Up to 99% coverage of the surface area
- Up to 95% reduction of evaporation
- Up to 96% reduction of odour emission
- Noticeable reduction in organic growth
Some of the benefits of the Hexa-Cover®Floating Cover include:
- Ease of installation
- Installation in both full and empty tanks
- Automatic distribution on the fluid surface
- Adapts automatically to changes in the water level
- Fits to all shapes and geometries
- Adapts to changes in water surface area
- Unlimited access to the liquid
- No running costs
- No repair costs
- No maintenance costs
- Needs no supervision
- Unaffected by rain, snow and frost
- Allows use of aeration
- Favourable price
- 10 years warranty
- 25 years expected lifetime
The Hexa-Cover® Floating cover comes in two sizes:
Hexa-Cover®Floating Cover R90 |
|
|
Diagonal size |
180 mm |
|
Height |
50 mm |
|
Weight |
120 g |
|
Weight per m2 |
5.15 kg |
|
Pieces per m2 |
43 |
|
Bag size |
1.0 x 1.3 x 2.5 m |
|
Surface area per bag |
50 m2 |
|
Bag weight |
265 kg |
Hexa-Cover®Floating Cover R114 |
|
|
Diagonal size |
228 mm |
|
Height |
70 mm |
|
Weight |
243 g |
|
Weight per m2 |
6.80 kg |
|
Pieces per m2 |
28 |
|
Bag size |
1.0 x 1.3 x 2.5 m |
|
Surface area per bag |
40 m2 |
|
Bag weight |
275 kg |
Testimonials
Microfiltration
Microfiltration is a process that uses a porous membrane to remove suspended solids and microorganisms from water. Microfiltration membranes act much like a very fine sieve to retain particulate matter, while water and its soluble components pass through the membrane as filtrate, or filtered water. The retained solids are concentrated in a waste stream that is discharged from the membrane system. The pore size of the membrane and the integrity of the sealing mechanism controls the fraction of the particulate matter that is removed.
Since 2007 Marshall Projects has partnered with Pall to deliver twelve drinking water and two wastewater treatment plants in New Zealand. These projects have all utilised Pall Aria™ microfiltration systems ranging in capacity from 150 to 30,000 m³/day. Both companies have committed to long-term involvement in the water and wastewater industries in New Zealand.
Pall Corporation is the world’s largest supplier of filters, filter systems and fluid purification equipment. Pall Water supplies hollow fibre membrane filtration systems and services that are specifically designed to meet the requirements of each project.
Pall Aria™ microfiltration systems are used to filter ground and surface waters for drinking water and industrial use and secondary effluent for reuse.
Marshall Projects is the system integrator and installer responsible for the management of the design, procurement and installation of all supporting infrastructure including the installation of the plant, interconnecting pipework, electrical and any off-skid instrumentation.
Microfiltration can be used to remove the following contaminants from water and wastewater.
- Suspended Solids/Turbidity
- Bacteria
- Cysts and Oocysts
- Iron and Manganese
- Arsenic
- Organics
Pall Aria™ microfiltration systems offer the following benefits.
- Highly permeable membrane resulting in high water production rates and a compact system footprint
- Tough, long-service hollow fibre membranes that are compatible with chlorine and common treatment chemicals
- High recovery rates, low waste
- Exceptional tolerance for high contaminant levels.
- Automated, operator friendly controls
- Lower operating costs
Marshall Projects are experienced experts in membrane filtration projects.
- Local design and project execution
- Project management and delivery systems
- Proven delivery performance for microfiltration systems
- Ongoing support
Microfiltration can be used to remove the following contaminants from water and wastewater.
- Suspended Solids/Turbidity
- Bacteria
- Cysts and Oocysts
- Iron and Manganese
- Arsenic
- Organics
Pall Aria™ microfiltration systems offer the following benefits.
- Highly permeable membrane resulting in high water production rates and a compact system footprint
- Tough, long-service hollow fibre membranes that are compatible with chlorine and common treatment chemicals
- High recovery rates, low waste
- Exceptional tolerance for high contaminant levels.
- Automated, operator friendly controls
- Lower operating costs
Marshall Projects are experienced experts in membrane filtration projects.
- Local design and project execution
- Project management and delivery systems
- Proven delivery performance for microfiltration systems
- Ongoing support
Turnkey Projects
At Marshall Projects we have extensive experience in providing turnkey projects that include civil, structural, mechanical, controls and electrical work using both in house resources and approved sub-contractors. We pride ourselves on delivering high quality projects that are completed on time and on budget.
We specialise in forming partnerships with our clients to understand and provide a cost effective and robust solution that is customised to their requirements. This is achieved by analysing raw data, providing tailored options from concept through to detailed design, then using our experienced project management team through construction, commissioning and hand over to the clients’ operations team.
Our company has the capability to complete ring fenced projects and we utilise the Common Permit to Work System that helps us constantly achieve KPI’s as agreed with our clients on a project basis.
