Packaged Sewage MBR

MENA Water packaged plants are designed to treat sewage from towns and small cities. As a pre-fabricated system that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

Ideal for remote locations where there is limited process and mechanical support, MENA Water package plants has been designed to provide both a robust process and mechanical design.

There are hundreds of MENA Water installations around the world that provide a safe, efficient and reliable treatment process.

MENA Water packaged plants are designed to treat sewage from villages. As a pre-fabricated system that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

Ideal for remote locations where there is limited process and mechanical support, MENA Water package plants has been designed to provide both a robust process and mechanical design.

There are hundreds of MENA Water installations around the world that provide a safe, efficient and reliable treatment process.

MENA Water packaged plants are designed to treat sewage from mine sites and accommodation camps As a pre-fabricated system that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

Ideal for remote locations where there is limited process and mechanical support, MENA Water package plants has been designed to provide both a robust process and mechanical design.

There are hundreds of MENA Water installations around the world that provide a safe, efficient and reliable treatment process.

MENA Water packaged plants are designed to treat sewage from resorts and hotels. As a pre-fabricated system that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

Ideal for remote locations where there is limited process and mechanical support, MENA Water package plants has been designed to provide both a robust process and mechanical design.

There are hundreds of MENA Water installations around the world that provide a safe, efficient and reliable treatment process.

MENA Water packaged plants are designed to treat sewage from housing and accommodation developments. As a pre-fabricated system that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

Ideal for remote locations where there is limited process and mechanical support or where the cost to provide mains connected sewage infrastructure is to high, the MENA Water package plants have been designed to provide both a robust process and mechanical design.

There are hundreds of MENA Water installations around the world that provide a safe, efficient and reliable treatment process.

MENA Water packaged plants are designed to treat sewage from sites as small as resorts and mine sites to larger development sites, towns, villages and even small cities. As a pre-fabricated, fully integrated system, that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

The following chart provides a simplified overview for the main MENA-Water MBR treatment process:

Settlement Tank with Pre-Treatment

The raw sewage is first fed to a automatic fine screen to remove screenings and fibrous materials. The screen is sized to the peak flow and is fitted with a 3mm perforated plate screen.

Then screened wastewater flows in the primary settling chamber which is sized on a retention time to settle all grit and heavy sludge (> 1 h).

Grease and fats are retained in the settling chamber by a baffle wall and are removed manually by a hand rake weekly. This process can be automated if preferred.

Fixed Bed Reactor

Pre-treated wastewater flows to a tank equipped with an aerated fixed bed. In this treatment step the key processes for COD removal and nitrification commences. The plant is also capable of intermittent denitrification controlled by the PLC to achieve nitrogen reduction.

The wastewater transfers by gravity via an submerged overflow to the anoxic tank

Anoxic Tank

If nitrogen removal is required, this tank serves as anoxic zone for the denitrification process. The sewage then overflows by gravity to the aeration tank.

Aeration Tank

In the aeration tank fine bubble diffusors and mixers are installed to supply oxygen for the activated sludge process (pressurized air is fed by the blowers installed inside the container). In the aeration tank sludge concentration is maintained to be in the range of 10 g/l. Biological removal of nitrogen and phosphorous can be achieved by optimized process control of the aeration pattern (controlled cycles of anaerobic / anoxic / aerobic phases). Recirculation is achieved to the aeration tank via pumps feeding to MBR filtration chamber.

Membrane Filtration

The water – activated sludge – mixture is pumped to the membrane chamber by recirculation pumps via an additional top strainer. The pumps supply approx. 3 times the filtrate quantity to the membrane chamber; excess fluid flows back into the aeration chamber. In this way, the sludge concentration and level in the membrane chamber is always kept at constant level, i.e. membrane performance is enhanced while activated sludge is maintained in continuous recycling process.

The membrane modules are a physical ultrafiltration system allowing only high quality water to pass through, from the outside to the inside. Scouring aeration is provided to keep the membrane surface always clean. Clear water (permeate) is sucked via permeate pump with a negative pressure ranging from 30 mbar to 300 mbar. Average flux rate through the membrane is designed to be 24 l/(m²h) for most typical sewage applications. Normal automatic operation sequences consist of filtration – relaxation – cycles in an approx. interval of 10 min – 2 min, i.e. permeate pump runs for 10 min. and then stops for 2 min. to allow for membrane relaxation.

Suction pressure is continuously monitored via transmitter/manometer. Increase of negative pressure indicates clogging of the membranes and implies requirement for cleaning. Key parameters are continuously measured and linked to the plant control system so the respective measures / warnings are released automatically if necessary.

The permeate pump delivers the filtered water into the permeate tank located on top of the MBR container. From there the treated water overflows via gravity to the treated water tank.

Automatic Backwash and Chemical Cleaning

Approximately every six hours clean water from the permeate tank is used for backwash operation. This means permeate pump stops and permeate flows from permeate tank back to the membrane modules. This regular process is activated automatically and enhances the overall performance of the filtration process.

Furthermore, to prevent fouling phenomenon on the membranes, approx. once per week an extended chemical backwash step (“CIP”) is foreseen. During
CIP phase, the backwash operation is performed for approx. 30 min. with chlorine solution.

Chlorine Dosing

A dosing system provides a chlorine solution to the permeate tank. To keep the system disinfected and to prevent re-contamination, chlorine dosing is automatically applied approx. once every two hours for a few minutes, in addition to the dosage during CIP backwash as mentioned above.

MENA Water packaged plants are designed to treat sewage from sites as small as resorts and mine sites to larger development sites, towns, villages and even small cities. As a pre-fabricated, fully integrated system, that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

MENA Water packaged MBRs are available in two configurations:

MR-I Version

Systems from 25 to 300m3/day in a complete single packaged unit inclusive of aeration reactor. All equipment is housed within the packaged system, pre-piped and wired.

MR-U Version

Systems from 25 to 1000m3/day with a packaged MBR filtration compartment with an external aeration reactor. The aeration tank, pre-treatment and final holding tank are built from concrete for below ground hidden applications or from polyethylene, steel, stainless steel or concrete for above ground. The MBR compartment is delivered pre-wired, piped and tested and all pumps, screens and aeration grids are provided.

MENA Water packaged plants are designed to treat sewage from sites as small as resorts and mine sites to larger development sites, towns, villages and even small cities. As a pre-fabricated, fully integrated system, that is simply bolted to a concrete slab the costs associated with civil construction and site installation is greatly reduced.

The following sizes are available as standard for the MR-U and MR-I range. Please note that these are provided as a guide only and will vary on each application.

MR-I Version

Systems from 25 to 300m3/day in a complete single packaged unit inclusive of aeration reactor. All equipment is housed within the packaged system, pre-piped and wired.

MR-U Version

Systems from 25 to 1000m3/day with a packaged MBR filtration compartment with an external aeration reactor. The aeration tank, pre-treatment and final holding tank are built from concrete for below ground hidden applications or from polyethylene, steel, stainless steel or concrete for above ground. The MBR compartment is delivered pre-wired, piped and tested and all pumps, screens and aeration grids are provided.

*typical capacities for municipal wastewater. Consult Hydroflux Epco for detailed sizing.