Minus Engineering

Less Energy
Less Waste
Less Cost

01 NeutraSeal Technology

NeutraSeal provides a tool to address the water energy nexus by de-coupling water treatment from scale power generation and distribution. It reduces the costs of water treatment by harnessing a water's static head i.e. the water's own weight is used as the primary source of power for treatment (Patents pending). The process is modular and delivers both operational and capital savings. It substantially increases the range of reliable operating geographies.

Water minus contaminants.

Water minus energy.

Water minus cost.

Minus is looking to increase the availability of treated water by applying NeutraSeal with interested partners.

Cost savings

This innovative technology has been proven to reduce conventional electrical consumption by 60% at pilot scale. Savings will be greater at scale allowing large volumes of water to be treated when conventional pumped solutions might be unfeasible. Capital costs are also reduced by over 30% thanks to the combination of modularisation and process intensification that NeutraSeal offers.

The principle

The NeutraSeal principle illustrates the step change in operation available over a conventional arrangement. It shows that water is transferred through the plant under gravity instead of being pumped. The way this is done also allows the cost of other water treatment costs such as aeration, mixing and chemicals consumption to be minimised. NeutraSeal can be tailored to meet the needs of different wastewaters by incorporating appropriate treatment technologies within the overall NeutraSeal energy-saving platform.

NeutraSeal is hydro-treatment and can be compared with hydro-power but instead of using water to generate electricity it is used to treat water.

Download the the NeutraSeal brochure
(printable version)

To find out more
please contact us:

Conventional Water Treatment Arrangement:

NeutraSeal - conventional water treatment arrangement

Conventional Water Treatment Arrangement with Energy Recovery:

NeutraSeal - conventional water treatment arrangement with energy recovery

NeutraSeal Water Treatment:

NeutraSeal - NeutraSeal water treatment arrangement

Water technology minus risk:

Financial risk

As water treatment plants are capitally intensive and subject to long mobilisation and procurement times it is important that the treatment technology will deliver reliably over time.

NeutraSeal mitigates financial risks as it incorporates proven chemical technologies into a form that is both standardisable and replicable.

As it can be built modularly this reduces lead time, minimises on-site risks and reduces mobilisation cost.

The process reduces both capital cost and operational costs. In particular, power consumption is minimised reducing the ongoing costs of energy.

Health and Safety

The hazards of water treatment plant are often greatest during construction and the risk can be exacerbated in remote locations due to adverse conditions and lack of available skilled workforce. A modular NeutraSeal system mitigates this risk by allowing construction to be undertaken off-site in a suitable environment.

During operations conventional water treatment plants are open to atmosphere and often include large open treatment tanks which can present hazards to public and/or operators. NeutraSeal can scale treatment in real time which can eliminate the need for holding lagoons or tanks. As the process is sealed from atmosphere the risks associated with waters and gases are minimised as waters are confined within the system from point source until treated. Additional benefits can be gained as treatment gases can be easily captured for reuse or disposal.

Environmental Risk

The environmental risk for an operator stems not just from the wastewater and its potential impact but also the environmental cost of conducting treatment. The NeutraSeal process mitigates environmental risk for an operator:

  1. Existing waste water streams can be treated using a minimum of energy.
  2. Operational risks of plant failure or capacity problems are reduced. It is controlled in real time which means operational compliance is ensured as follows:
    1. It can scale to meet upstream requirements whilst minimising resource use e.g. chemicals and energy.
    2. If a treatment failure occurs on the plant appropriate action can also be taken immediately.
    3. The system can automatically revert to a failure mode of standby pumping to provide increased capacity for extreme events and/or provide redundancy.
    4. The sealed nature of the system minimises risk of odours or of affecting the surrounding environment.

02 Applications

  • Mine water
  • Shale gas
  • Flood prevention
  • Effluent treatment
  • Waste water treatment
  • Clean water treatment

03 What have we done so far?

Development from first principles

Minus engineers developed NeutraSeal from first principles after recognising the cost of treating large flows of water using conventional water treatment plants.

Engineered a solution

Conventional water treatment plants fundamentally operate in the same way across a number of sectors, pumping water from a collection point through a treatment train before discharge to a suitable location. The first stage of development was to work up the NeutraSeal design to solve specific challenges for a non-pumped solution, these included:

  1. How to aerate water and capture gases within a sealed system whilst maintaining reliability and operability.
  2. How to maintain flow control of a system siphoning stably with time.
  3. How to remove contaminants from the system without negatively impacting energy efficiency.

Market testing

After applying for suitable protection for the technology Minus took NeutraSeal confidentially to relevant bodies to ask for feedback. The feedback was positive and we were asked if we ‘had one’. At that point we didn’t.

Secured initial financing

Minus then secured financing from the UK’s Technology Strategy Board in 2012 to build and test a pilot plant and have the process efficiency verified by University of Exeter’s Camborne School of Mines. This was undertaken under Environment Agency permit on a disused mine.

Successful pilot testing

The pilot project was successful in that it delivered an energy saving of over 60% and capital cost savings were identified whilst maintaining water treatment quality. The treated waters met the Environment Agency permit requirements of a nearby full scale mine water treatment plant treating similar water.

04 Contact us

Please contact us; we are looking for partners to implement the technology globally. All we need to understand and to assess the scale of benefit for a given application is:

  1. Is the source water higher than any potential discharge points?
  2. What volume/flow needs treating?
  3. What is the water to be used for?

Email: info@minus-eng.com
UK office: +44 (0)7850 174643
US office: +1 978 930 3228

05 What we do

  • Understanding

    We have the technical expertise to understand your water treatment problem from first principles, understand the options that arise from site hydrodynamics and match a solution that provides savings to suitable equipment.

  • Solving

    We understand your issues and we match what you want to achieve with an engineering solution. Problems into opportunities.

  • Improving

    We have the technical expertise to provide ongoing operational support including monitoring of your system's efficiency, analysing management data and optimising the hardware itself.

  • Managing

    Our experience as project managers, allows us to supervise the commissioning and supervision of multi-function improvements.

06 Who we've done it for

Minus have over 20 years' experience in the supply of water treatment packages and systems:

    Environment Agency LK Group RAW WWT Service Aluminum Corporation Sanctus Resource Chemical Ltd EDP EDF Energy AECOM Southern Water Soilfix