PRODUCTS & Services

Bio-Shells

Upgrade your wastewater ponds at a cost that you can afford. Bio-Shells can extend pond service life for years at a fraction of the cost of alternative technologies.

Developed by the University of Utah, professors Kraig Johnson and Larry Reaveley, Bio-Shells’ award-winning, patented technology consists of concentrically nested domes that are infused with air from the bottom. They sit on the floor of a pond and are completely submerged.

As water flows through them 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 domes by their geometry.

Because the Bio-Shells 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-Shells can be installed incrementally as required in order to ensure compliance.

The key benefits of Bio-Shells 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

BOD Reduction

  • 4 Layer Bio-Shells – 6.9 kg/day/unit
  • 2 Layer Bio-Shells – 1.8 kg/day/unit

Suspended Solids Reduction

  • 4 Layer Bio-Shells – 2.67 kg/day/unit
  • 2 Layer Bio-Shells – 0.7 kg/day/unit

Ammonia Nitrogen – Nitrification

The Bio-Shell system is designed to reduce ammonia nitrogen concentrations at very low temperatures.

 

  • 4 Layer Bio-Shells – 0.30 kg/day/unit
  • 2 Layer Bio-Shells – 0.08 kg/day/unit

Air Requirements

For the two different Bio-Shells, the air requirements are:

 

  • 4-Layer Bio-Shells – 3.5 SCFM/Unit
  • 2-Layer Bio-Shells – 1.0 SCFM/Unit

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

Napa Berryessa Resort Improvement, Napa, CA

Napa Berryessa Resort Improvement, chose Hexa-Cover® Floating Cover for a wastewater application for controlling odour, algae and evaporation

Hexa-Cover® Floating Cover is installed at Lake Berryessa Wastewater Treatment plant, 1465 Steele Canyon Road, Napa. The application is to cover two concrete equalization basins.

Process: Raw sewage from homes and resort, flow from gravity and lift stations into headwork’s Lakeside Spiral Screen, screened water into two equalization basins with Hexa-Cover® Floating Cover, then to Ovivo MBR, to effluent basin or alternate overflow basin, then pumped to reservoir off site for land application.

Plant flow capacity approximately 30.000 GPD now and at build out 60.000 GPD.

“The visit to the plant was a bit amazing. There was no odor from the “Hexa-Covered” EQ Basins. These EQ basins have very high odor potential and algae potential because of the heavy nutrients coming off the screen. There was no algae, the discs as advertised interlocked, they floated up and down with no problem, and could not help but reduce evaporation. 

A solid cover presented safety issues, the discs did not. Summit Engineers was going to put aeration in these basins but saw a sample of the HexaCover® product, called references then recommended the Hexa-Cover® installation. It penciled out better than aeration. That was important to this design-build project, which Western Water Constructors, Inc. did with Summit. 

Adjacent to these equalization basins are the effluent basin and overflow basin. These two basins were covered with algae.

The point; the Hexa-Cover® Floating Cover eliminates algae!

As proof, side by side basins, same plant, same time, two “Hexa-Covered” basins without algae and two uncovered basins with heavy algae. Also, no odour from the EQ basins.

The discs arrived in large sacks. Installation was simple; they simply dumped the discs into the basins. Installation was less than an hour. Contrast that to an aeration system”

Water Corporation Western Australia, 6000 Perth

2.000 m2 wastewater reservoir

“Water Corporation (WA) installed Hexa-Cover® in a wastewater treatment pond in Leonora, Gold­field Region.

We are happy to say, the installation went very smoothly. To date the effluent quality supplied to the recycled water scheme is much improved as well as the quantity”

Leanne Brown, Analyst – Water Quality Risk

Sashimi Royal, DK-7730

“Since 2017 we have used Hexa-Cover® in our sea water tank in order to control growth of algae.

Our conclusion is very clear; Hexa-Cover® is a very effective tool to avoid growth of algae as the sun is blocked from affecting the water.

Further, the Hexa-Cover® is very easy installed, it requires no maintenance, no service and no repair.

Prior to choosing Hexa-Cover® we also considered a tank-top but as we are located right at the seafront, we realized that we needed a long lived solution in no risk of being damaged by wind.

We are very pleased about Hexa-Cover®.”

Christian Bidstrup, Technician

Sitech Services B.V., NL - 6167

10.600 m2 Industrial wastewater

“We are satisfied with the use of the Hexa-Cover® to cover up one of our process water basins at the Chemelot site. The odour in the area has reduced drastically”

Jacky Vanholzaets, Technical Manager

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.