Treatment Solutions

 Setfords SAF Effluent Treatment

Setfords Submerged Aerated Filter (SAF) units can be supplied in a range of configurations for both Municipal and Industrial treatment applications.

Our SAF units utilise a biological treatment.  It is simple to operate, robust in performance, and capable of producing a high quality treated effluent delivering typical effluent quality after downstream humus settlement: 10mg/l BOD, 30mg/l SS, 3mg/l Amm.  Our SAFs  are available in various sizes ranging from 100 population equivalent to 1,500 population equivalent, all in a single stainless steel tank divided into compartments

From our standard SAF range to super energy efficient PLC controlled I-SAF’s, to Anoxic SAF’s, Lamella Settlement Tanks and a range of pre and post treatment options, Setfords Technology offers the optimised solution to wide variety of waste stream profiles.

 Setfords SAF Highlights

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SAF’s also available in reinforced concrete cells to expand SAF opportunities from the low thousands population to around 10,000 population.

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Very high density of air diffusers resulting in effective treatment across the full surface area of media.

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Requirement for SAF desludging has been designed out.

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Stainless steel construction with extending life span.

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1,500 pe SAF unit available in a single tank.

Biological Wastewater Treatment

 

SAF is an efficient biological treatment process used to treat wastewater with high level of BOD, COD Nitrogen and high levels suspended solids.

In a Setfords SAF each compartment is filled with rigid structured Pvc media. These modern, high rate filter plastic media use naturally occurring bacteria to reduce both energy consumption ans carbon footprint.

Our SAFs can remove over 90% of COD and BOD pollutants, making SAF amongst the most universally effective solution for remedial water and waste water treatment solution for municipal and industrial effluent types.

Correct specification is crucial to both energy efficiency and operational reliability of a biological wastewater treatment solution. At Setfords we offer a comprehensive range of project scoping services, pilot treatability studies and test unit hire to ensure that our customers’ get the most effective solution to their specific requirements. 

Reduced Downtime

Reduced Energy Consumption

Improved Flow Rate Management

Improved Toxicity & shock load Resilience

Reduced sludge production

EXTENDED ROI

Plastic Media Trickling Filter System Performance

%

Typical BOD & Ammonia Removal Rates

Plastic Media Trickling Filter System Performance

%

Mean Energy Saving over Activated Sludge

Setfords’ SAF System Specification

Setfords have been designing and building SAF systems since 1993, assisting Water Companies in the development of their SAF specifications and design standards.

Our extensive experience – combined with a comprehensive range of project scoping, consultancy and pilot studies services – ensure our syetems are designed to optimise our customers’ systems performance, extend RIO and minimise downtime.

At Setfords we deploy fine bubble membrane diffusers mounted on a removable stainless steel manifold assembly underneath the media.

The effluent passes through the media which provides a high surface area for the natural biomass to grow on.

Sufficient air is passed through the air diffusers by means of air blowers into the structured media. This not only provides oxygen for the biomass but, in addition, it scours off surplus biomass from the media, removing the need for pumped backwashing of the plant.

The SAF effluent then passes into humus tanks, with the settled SAF sludge normally being pumped back to the primary settlement tanks.

The air diffusers only require replacing every 7 years or so, and there are no moving parts in the SAF cells.

We supply a walk in GRP kiosk housing duty / standby side channel air blowers and a control panel.

Sufficient air is passed through the air diffusers by means of air blowers into the structured media. This not only provides oxygen for the biomass but, also, it scours off surplus biomass from the media, removing the need for pumped backwashing of the plant.

The SAF effluent then passes into humus tanks, with the settled SAF sludge normally being pumped back to the primary settlement tanks.

The air diffusers only require replacing every 7 years or so, and there are no moving parts in the SAF cells.

We supply a walk in GRP kiosk housing duty / standby side channel air blowers and a control panel.

For larger SAF installations we provide positive displacement air blowers mounted in their own weatherproof acoustic enclosures.

All tanks & pipework are manufactured in stainless steel delivering maintenance free & long asset life.

With no moving parts in the SAF compartments, all our SAF’s are extremely robiust and have very low maintenance requirements.

Our systems are also simple to operate., with no operational involvement required other than visual checks.

SAF technology also ensure that Setfords SAF’s are robust in performance and have the ability to accept shock loads. .

High quality treated effluent achievable (10mg/l BOD, 30mg/l SS, 3mg/l Ammn)  

Model

Pe

Height

Width

Length

Power

ST 100

100

2.7m

1.7m

1.7m

1.5kW

ST 300

300

2.7m

1.7m

4.7m

3.0kW

ST 500

500

3.0m

2.0m

5.6m

4.0kW

ST 750

750

3.0m

2.0m

7.4m

5.5kW

ST 1000

1000

3.3m

2.3m

8.6m

7.5kW

ST 1400

1400

3.3m

2.7m

10.2m

11.0kW

High quality treated effluent achievable (10mg/l BOD, 30mg/l SS, 3mg/l Ammn)  

Energy Efficient I-SAF Systems

To reduce energy consumption and operational costs, we offer an Intelligent SAF unit (I-SAF) which reduces power consumption by  around 50%. A Setfords I-SAF is identical in every respect to one of our standard SAF units but has intelligent control and monitoring devices linked to a PLC. I-SAF is available in the following specifications:
 

  • Gold – Dissolved oxygen control, variable speed blowers, PLC monitoring, timed air scour cycle
  • Silver– 4-20mA output from inlet flow recorder linked to PLC monitoring, variable speed blowers, timed air scour cycle
  • Bronze – Stepped increase and decrease from variable speed blowers based on historical flow data, PLC monitoring, timed air scour cycle.

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Typical I-SAF Energy Saving

Anoxic SAF System

Used to remove Nitrogen and facilitate alkalinity recovery, Denitrification is a process where nitrate (NO3) is converted to Nitrogen (N2) primarily by means of heterotrophic bacteria.

Denitrifying microbes require a very low oxygen concentration of no greater than 0.5ppm, as well as organic C for energy.

Denitrification generally proceeds through some combination of the following intermediate forms:

NO3− → NO2− → NO + N2O → N2

The complete denitrification process can be expressed as a redox reaction:

2 NO3− + 10 e− + 12 H+ → N2 + 6 H2O

Air, required for occasional media scouring enters all three SAF cells. The air is controlled by means of a timer with adjustable frequency & duration.

Air scour is used sparingly, as the dissolved oxygen levels in the Anoxic SAF cells need to be maintained at a level no higher than 0.5mg/l. Default setting is daily for 10 mins at midnight.

Anoxic SAF Process

Lamella Plate Settlement Tanks

We design and manufacture a range of Lamella Plate Settlement Tanks that we use in conjunction with our SAF units to create a complete wastewater treatment system.

These units are available for hire and for purchase, should you only require a solids sedimentation system.

Meeting the Effluent Challenge

Whether you are looking to optimise the performance and or commissioning a new facility to meet the increasingly stringent discharge compliance standards, Setfords Technology’s  can provide a treatment system that delivers:

Quality & Capacity

Improved capacity & quality of effluents

System Reliability

Minimise downtime and manitenance

Energy Cost

reduced energy consumption & carbon footprint

To assess how a Setfords SAF system could reduce the cost of your wastewater treatment either call us on on (0)1359 243500 or click on the link below and complete the form and one of our expert engineers will help scope and price your project.

Setfords Technology Ltd

Surrey Office
Tresco, Horsham Rd
Walliswood, Dorking,
Surrey, RH5 5RL, UK

Switchboard: +44 (0) 1306 627086

 

 

 

Setfords Technology Ltd

Head Office
Woolpit Business Park
Woolpit, Bury St Edmunds
Suffolk, IP30 9UP, UK

Switchboard: +44 (0) 1359 243500

enquiries@setfordstechnology.com

Company number 11056528
Registered Address
30 Chancery House, St Johns Road,
Woking, Surrey,
GU21 7SA, UK