Wastewater Treatment

Our global experience with a variety of wastewater treatment plant types, including the latest Membrane Bioreactor (MBR) technology, gives us an advantage in tackling almost any wastewater challenge. We deliver customer-focused solutions that are efficient, cost-effective and reduce the environmental impact.


Also known as sedimentation, clarification is the removal of settleable solids by gravity.  Sand, grit, precipitates, pollutants, flocs, and other solids are kept in suspension in water as long as the water is flowing with sufficient velocity and turbulence.  Sedimentation removes these solids by reducing the velocity and turbulence.  The process takes place in large tanks called sedimentation basins. Basins designed for efficient sedimentation allow the water to flow very slowly with minimum turbulence at entry and exit points.  The solids accumulate at the bottom of the basin as a sludge which must be pumped out and disposed of.    


Gravity filtration is used to remove suspended material from water by trapping the material between the grains of filter media. The force of gravity is utilized to move the water through the filter.  The filter tanks are typically rectangular and contain the filter media and an under drain system.  Filter media consists of different grades of sand with different grain sizes, anthracite, which is lighter than sand so remains above the sand and garnet which is used as the bottom media because of its greater density.  The under drain system allows for uniform collection of filtered water and an even distribution of backwash water.  Rapid sand filters have a desired filtration rate of 2 gpm/ft2 and high-rate filters have a filtration rate of 4-6 gpm/ft2.


Membrane Bio-Reactor is a wastewater treatment technology.  Membrane bio-reactors function similarly to traditional waste activated sludge water treatment processes except that separation of liquids and solids is accomplished by membrane filtration rather than sedimentation in clarifiers.  The key components to an MBR system are micro filtration or ultra filtration membranes, which allow for the removal of particulate materials.  This process also has the advantage of being able to process wastewater with a higher suspended solid content compared to a conventional wastewater treatment plant.  Generally, the footprint of an MBR system is smaller than traditional wastewater treatment technologies because it eliminates the need for a clarifier and tertiary treatment. 


Ultra filtration is also a size-exclusion, pressure-driven membrane process.  Compared to micro filtration, UF retains much smaller particles.  Molecules greater than the nominal pore size or nominal molecular weight cutoff (MWCO) are retained.   Most UF systems range from 80k to 100k MWCO.  This type of water treatment typically targets particulates, bacteria, protozoa, viruses, and organic molecules.   Operating pressures range from 10 to 50 psi.

Micro filtration is a size-exclusion, pressure-driven membrane process.  This technology uses microporous membranes which can remove contaminants ranging from 0.1 to 10 μm.  Microfiltration provides an effective barrier for particles, bacteria, and protozoan cysts.  Operating pressures range from 5 to 30 psi.  


Brackish Water Reverse Osmosis is a pressure-driven membrane processes.  Hydraulic pressure is used to overcome the feed solution’s osmotic pressure and induces diffusion of pure water referred to as permeate, through a semi-permeable membrane.  The solutes in the feed stream are concentrated during the process and leave the system as concentrated brine, also known as reject.  These systems effectively remove all organic and inorganic constituents, including monovalent species.  Operating pressures for BWRO ranges from 200-400 psi.    

Team Experience

As wastewater disposal regulation becomes more stringent around the world, treatment technologies become more complex.  Seven Seas Water has the technical skills and expertise to effectively treat any waste stream and ensure your business meets or exceeds the required standards.  Top travel destinations, large cities, and manufacturers have relied on members of the Seven Seas Water team to carefully plan, install and maintain wastewater utilities that operate efficiently and produce clean, safe product water that can be repsonsibly discharged back into the environment.