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Bund Maintenance and Repair

A bund is a secondary containment system that serves the purpose of capturing any leaks or spillages from a primary containment, such as a storage tank.

What is a Bund?

A bund is a secondary containment system that serves the purpose of capturing any leaks or spillages from a primary containment, such as a storage tank. It is composed of an impermeable floor and a set of impermeable walls, creating a watertight area around the storage tank. The bund effectively retains any liquid that escapes from the primary containment, preventing it from spilling onto the site or escaping into the environment.

Bund maintenance

Bund maintenance often overlooked, but it crucial for the longevity and effectiveness the infrastructure. Over time bunds wear and become unfit for their if not properly maintained.ing a maintenance and inspection is important to identify necessary repairs prevent further damage.

Removing water

An effective bund should collect and contain all substances that enter it, including rainwater and other unwanted debris. Neglecting proper maintenance can lead to a build-up of unwanted materials, reducing the bund's capacity and potentially causing it to fall below requirements. It is essential to regularly remove rainwater and test it for contamination before disposing of it. Contaminated water must be disposed of in accordance with waste regulations or treated using appropriate control measures.  For oil bunds, automatic bund water control units can be installed to separate oil and water, pumping out only the water.

Bund Surveys

In addition to regular rainwater removal, periodic inspections should be conducted to assess the condition of the bund walls, floor, penetration seals, and linings. Any defects or damage should be promptly repaired to prevent further deterioration. Even minor cracks can lead to liquid leakage, and structural issues can significantly weaken the bund walls, risking failure under dynamic loads. Hydrostatic testing, filling the bund with water and monitoring for any loss, can also be performed to determine if the bund is watertight.

Bund Repair

If a bund experiences any issues, it is crucial to address and fix them promptly. Defective bunding can be even worse than having no bunding at all, as it can mask leaks and create a false sense of security. Over time, chemicals or oil leaking from faulty bunds can cause serious contamination of the surrounding ground and groundwater. Cracked bunds need to be repaired to ensure not only water-tightness but also structural integrity to withstand potential catastrophic failures. If the bund lining fails, relining or patch repairs should be undertaken.

Vehicle and Equipment Bund (6000x2500x250mm)

Vehicle and Equipment Bund (6000x2500x250mm) || 25Hx250Wx600L || SKU: 1000357 || MPN: EB6 || Brand: Romold

Our PVC portable bunds are easy to store and transport, quick to assemble and are compatible with hydrocarbons and a wide range of chemicals (compatibility information available upon request). These portable bunds are the ideal solution to your containment needs when a standard spill pallet is impractical.

Welded PVC construction. Aluminium support brackets. Turn buckle connectors. No tools required. Easy and quick to load and unload.

Extra Large Sediment Filter - 40kg - 150 Micron

Extra Large Sediment Filter - 40kg - 150 Micron || SKU: 1000441 || MPN: GRR 01 05 10 SEDO || Brand: Green Rhino®

Designed for use when pumping and de-watering trenches, manholes, bunds and excavations, these filters are easy to use on-site, cost-effective and offer exceptional return on investment. Suitable for use with all standard mobile water pumps and easily connected with the simple reusable cable ties provided, they are used on a daily basis by many of the UK’s leading utility contractors to remove sediment which could otherwise pollute navigable water or drainage systems.

Constructed from a layered system of nylon mono-filament for capturing sediment particles down to 150µm, and a PVC nylon outer sleeve tested for tensile strength and durability, this rugged filter sock is built to handle repeated use in harsh conditions. It's possible to reuse the filter up to 20 times dependant on the geology of the sediment.

The GREEN RHINO® Heavy Duty Sediment Filter will retain 40kg of sediment before having to be emptied so it can be reused meaning its suited well for larger dewatering jobs. Additionally the filter has 4 lifting straps to enable safe lifting, when full, by two people. With up to 800kg of sediment captured per filter and the ease of use, this is the professional utility contractors Sediment filter of choice.

Features :

• Save Money – No Vacuum Tankering Required
• Filter holds up to 40kg of sediment
• Simply empty and reuse up to 20 times
• Water discharged to Environment Agency accepted levels (150µm)
• Integral hydrocarbon detector alerts you to oil-based contaminants
• Easy to attach, use and empty
• 4 lifting straps for safe and easy two-person handling
• Highly visible colour to avoid trips

Budget Sediment Filter - 20 Kg - 100µm

Budget Sediment Filter - 20 Kg - 100µm || SKU: 1000439 || MPN: GRR 01 06 01 BFIL || Brand: Green Rhino®

Designed for use when pumping and de-watering trenches, manholes, bunds and excavations, these filters are easy to use on-site, cost-effective and offer exceptional return on investment. Suitable for use with all standard mobile water pumps, they are lightweight and small allowing easy storage when not in use.

The GREEN RHINO® Budget Sediment Filter will retain 20kg of sediment before having to be replaced. Which may equate to a single job or a small number of low usage jobs, meaning this filter is ideal for the smaller de-watering activities. When it becomes harder, or impossible, to pump water through, the filter is ready to be replaced.

This entry level sediment filter is designed to fit all budgets and cleans water to Environment Agency accepted levels of 100µm.

Features :

• Small and lightweight for easy storage & quick mobilisation
• Filter holds 20 kg of sediment for single person handling
• Water discharged to Environment Agency accepted levels (100µm)
• Designed for single use
• Easy to attach, use and empty

Tank emptying/ desludging in Scotland

Sewage treatment plants, cesspools, septic tanks, pumping stations and grease control systems in Scotland.

IBC/ Cesspools

An IBC/ cesspool is simply a single-chamber storage tank with no outlet.

The tank is usually very large (as it has to contain all waste water & sewage) and often made from concrete, brick or grp. The only way to dispose of the waste is by hiring a licensed sewage contractor to remove the sewage for off-site disposal.

The use of cesspools is no longer an option in most instances and new installations are banned in Scotland.

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How IBC/ Cesspools in Scotland work

IBC/ Cesspools are simply storage tanks, often underground, and hold untreated sewage.

There is no treatment process in IBC/ cesspools and are generally used when it's not possible to pump wastewater to a mains sewer, the ground conditions aren't suitable for the effluent to soak away, or,  where there's no watercourse for treated waste to be discharged to.

They can be good option on temporary sites or those that don't produce much waste, and because they are completely sealed, they're also good for environmentally sensitive sites, where even treated effluent could be a pollution problem.

Maintaining your IBC/ Cesspool in Scotland

Wastewater needs to be tankered away regularly, which is where we come in. Your job is to simply check the sewage levels and give us a a quick call when the tank's almost full. it is recommended that you check your cesspool at least once a fortnight. If a full tank isn't emptied it will overflow and you'll notice unpleasant smells, drains backing up, and pools of waste appearing around manhole covers. This kind of pollution can lead to prosecution and hefty fines.

Septic Tanks

A septic tank is a multi-chamber storage tank allowing liquid (effluent) and solid waste (sludge) to separate, the effluent flows out of the system, usualy in to a soakaway.

Sewage enters a settlement chamber, allowing solid waste (sludge) to sink and the liquid (effluent) to rise to the surface. the surface liquid makes contact with oxygen and the organic matter starts to breakdown biologically. While this liquid (effluent) still contains sewage it is in small enough particles to be carried through the discharge outlet and into the ground (soakaway).

Only partial treatment takes place in septic tanks, and the treated effluent is often low quality and smelly. 

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How Septic Tanks in Scotland Work

Wastewater leaves your property via the plumbing system, and enters the septic tank. Here, gravity separates solids and liquids. the heavy solids (known as sludge) build up at the bottom of the tank, while lighter greases and oils, or scum, float to the top of the liquid layer. Micro-organisms begin to break down the contaminants in the liquid, which are naturally present, partially treating the wastewater. This process generates natural gases, which are released through installed plumbing vents.

The liquid in the tank (called effluent) flows into a soakaway system. This will usually be a series of pipes, set underground in a bed of crushed rock, that allow the effluent to seep slowly into the ground. The rock acts as a filter, while natural bacteria helps break down the waste even further.

Maintaining your Septic Tank in Scotland

At least once a year, you'll need to arrange for your septic tank to be desludged. This keeps your tank working efficiently and helps prevent irreversable damage to your soakaway. 

Every septic tank system is designed to handle a certain volume of waste. If more people are using the tank, you might need to have it emptied more often, or increase the size of the tank or soakaway to cope with the extra usage.

If you don't have your tank desludged regularly, sludge builds up which means there's less space for new solids to settle. The new sludge would then get carried through the system in to the soakaway, which will cause irreversable damage called 'blinding' and will block the soakaway; making the whole system ineffective. You'll know you've got a problem when:-

• Sinks and toilets take a long time to drain;
• Sewage backs up in to the prooerty;
• Manholes or the tank itself overflows, or pools appear around the tank or soakaway area.

Sewage Treatment Plants

A sewage treatment plant is a sewage-works system that converts raw sewage into water (effluent) and solid waste (sludge). These ‘packaged’ plants come in all shapes and sizes but treat the waste using the same principles - combining oxygen and food (organic waste) to speed up a natural biological breakdown. 

All treatment plants need routine maintenance to keep them working at their optimum levels but treat them right and they are an environmentally friendly way of solving an off-mains drainage problem when a pumping station is not possible.

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How Sewage Treatment Plants in Scotland work

Sewage treatment plants create an artificial environment to speed up the natural process of breaking down the pollutants in sewage. The treated effluent can then be safely discharged into a local watercourse or soakaway system.

There are three main process types:-

• Rotating biological contactor (rbc);
• Aerated filter;
• Submerged aerated media (sam).

Primary treatment

Solid matter (sludge) separates from liquid waste and settles at the bottom of the primary settlement tanks, while lighter material forms a layer of scum on the top of the liquid. Sludge and scum need to be removed regularly. If it's not removed, the sludge will build up and eventually carry over into the secondary treatment stage, where it could interfere with the biological process, block the biological filter or pollute the watercourse or soakaway. 

Secondary treatment

The remaining liquid is broken down by live, naturally occurring micro-organisms (biomass) until the quality is high enough for it to be safely discharged to a watercourse or soakaway. The biomass is fed with oxygen to speed up the digestion process.

Final settlement

This final stage allows the contents of the humus tank to settle out. Where discharge consent is more stringent, tertiary treatment is likely. This adds significantly to overall process costs (i.e. nitrification units, sand filters and reed beds). Not forgetting the need for more frequent desludging.

Final disposal

If a watercourse is available and you've been given permission by the environment agency, this is the simplest way to dispose of the treated effluent.

Maintaining your Sewage Treatment Plant in Scotland

Regular tanker visits are essential to prevent sludge and scum building up in the tank. equally as important is having the system maintained by a properly trained engineer. 

Day to day you’ll need to keep the system and electrics well looked after – it is recommended that you get into the habit of inspecting the plant every day to check everything’s working properly. Its crucial the electricity supply is never turned off, as this will stop the treatment plant from working.

Your sewage treatment plant should be desludged and serviced at least once a year. However, each system is different and you should always arrange a desludge and service inline with the manufactures recommendations. This will ensure your sewage treatment plant is in proper working order and that your not breaking the law.

Pump Stations

If you pollute the surrounding area you could face prosecution and some hefty fines. If the biomass is harmed, it will usually recover with time and patience. But until it does, you’ll have to live with a pretty foul smell. A pump station is a chamber with electrical pumps inside. they are designed simply to move wastewater (or sewage) uphill or over a distance where gravity is insufficient to provide the required flowrate. 

Consisting of a chamber with either single or multiple electric pump units, the pump station is tailored to site conditions, automatically monitoring and maintaining a specific flow of wastewater over a certain length and height. pump stations are the most environmentally friendly option available if your property is within 30m of a mains sewer. Alarms are often fitted to warn of any blockage or failure.

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How Pumping Stations in Scotland Work

If the mains sewer is above the level of the property, you'll need a pump to raise the waste to the required level. Here, we'll install a chamber below the level of the house. waste discharged into the chamber is then automatically pumped out in to the sewer. Pumped mains need to be serviced, desludged and jetted regularly. some debris will build up in the bottom and sides of the chamber, so you'll need us to come and clear it from time to time. We'll also jet-wash the chamber to remove any build-up on the walls, float controls ans the pump itself.

An alarm can alert you of any problems, but if you don't have one fitted it's best to take a quick look at the chamber every day. The electrics and mechanics will need to be kept in good working order too.

If you don't get the sludge/ debris removed, solids and grits can build up in the chamber and cause damage to the pump - it's essential for keeping the pump and float switches working properly, and if the equipment isn't services regularly, the pump itself could fail - which can be an expensive replacement and may involve a number of emergency tanker attendances.

The pump chamber usually holds 24 hours' worth of waste, after which waste will either overflow or back up to the property.

Soakaways

If you have a sewage treatment plant or septic tank, you’ll probably have a soakaway system which takes the treated effluent from the tank and disperses it into the ground. The most common way of doing this is to use a herringbone layout of rigid, slotted pipework surrounded by drainage stone. 

Your could also have a reed bed is a product often specified in order to obtain an even higher level of water quality of a treatment plant before it seeps out into the surrounding land or watercourse. 

Soakaways have a limited lifespan which is heavily affected by the quality and volume of effluent dispersed through it. Typically soakaways last up to 10-25 years. the main cause of soakaway failures failing to have regular desludges carried out on your septic tank or sewage treatment plant, which allows untreated waste to flow in to the soakaway and causes a binging effect on the surrounding crushed rock preventing the soakaway from working correctly, this is irreversible.

Grease Traps

Fats, oils and grease (fog's) can create big problems for your business, left unchecked, and land you with some pretty hefty fines - as well as bad publicity for your business.

Grease traps are equipment used to treat the wastewater produced by kitchens and food processing areas. The waste usually contains a mixture of fog (fat, oils and grease) that has lesser density than water and therefor floats on the surface of the water. Grease trap helps in the separation of such fog particles from the wastewater and prevent them from flowing through the drainage pipe.

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How Grease Traps in Scotland work

Separated fats, oils & grease are retained inside the grease trap by a series of baffled chambers and the solid food waste is contained by the internal strainer basket whereas the cleaner 'grey' wastewater passes through the separator via a submerged outlet to the main drain.

Maintaining your Grease Trap in Scotland

Monthly visits are essential and are also a legal requirement to prevent fats, oils & grease from entering the public drainage network. Most system also have filters that require periodic replacement. 

The uk building regulations (part h 2.21) states that:-

• Drainage serving kitchens in commercial hot food premises should be fitted with a grease separator complying with en 1825-1 and designed in accordance with en 1825-2 or other effective means of grease removal.

BSEN 1825 1 and 2 standard states that:-

• Grease traps should be emptied at least once a month or preferably twice a month; 
• When it is 25% full of grease it should be emptied.

Bund Water Control Unit

Bund Water Control Unit || SKU: 1000549 || MPN: PQ-025G || Brand: Darcy

A bund is a secondary containment enclosure constructed around oil (or chemical) storage facilities to prevent leaks and spills from contaminating watercourses. The effectiveness of bunds relies on their watertight design, which leads to the accumulation of rainwater. This rainwater becomes tainted due to everyday drips from the storage facility. It is crucial to remove this polluted rainwater in an environmentally responsible manner to maintain the bund's full capacity for containing significant spills and to prevent oil pollution incidents.

Aquasentry's Bund Water Control Unit serves as a de-watering system designed for areas where rainwater mixed with oil residues can accumulate. This innovative system operates by detecting the distinction between oil and water, then efficiently pumps out the water into the surface water drainage system or a designated soak away area. It achieves a remarkable water removal rate of 145 litres per minute, resulting in a discharge rate of less than 5mg of oil per litre (equivalent to 5 parts per million). This exceptional performance makes the Bund Water Control Unit both safe and highly effective for its intended purpose.

Using conductivity probes, the unit determines the liquid's composition within the sump and triggers the pump to initiate water removal. Once all water is eliminated and only oil remains, the pump automatically stops. This process contributes to cost-effective and efficient waste disposal while safeguarding the bund from deterioration.

Operating tirelessly 365 days a year and 24 hours a day, the unit maintains your bunded area in optimal condition, ensuring it remains dry and free from oil contamination. These units find application in various scenarios, ranging from sub stations and oil bunds to underground lift shafts. They are also adaptable for use within zoned areas.

With the Aquasentry Bund Water Control Unit, your bunds consistently retain their specified 110% capacity, as outlined in PPG 2 regulations. This cutting-edge solution offers a cost-effective approach to de-watering, establishing a best practice standard for the environmental management of your bunded areas.

Key Features:

• Automated bund dewatering
• Alarm activation
• Continuous automatic monitoring
• Preservation of bund capacity
• Alert for potential pollution incidents
• Suitable for remote locations

Contact our sales team for install and commissioning in accordance with PPG2 and oil storage regulations. 

Multi Function PVC Containment Bund Base Mat (1500x1500mm)

Multi Function PVC Containment Bund Base Mat (1500x1500mm) || 150Wx150L || SKU: 1000364 || MPN: EB1M || Brand: Romold

EB1 + EB1M pictured (EB1M sold separately)

Base mat for use with multi-function PVC containment bund EB1.

Our base mat provides extra protection to the bund on rough or sharp ground.

Heavy Duty Sediment Dewatering Filter - Holds 20kg - 150 Micron

Heavy Duty Sediment Dewatering Filter - Holds 20kg - 150 Micron || SKU: 1000440 || MPN: GRR 01 05 02 SEDO || Brand: Green Rhino®

Designed for use when pumping and de-watering trenches, manholes, bunds and excavations, these filters are easy to use on-site, cost-effective and offer exceptional return on investment. Suitable for use with all standard mobile water pumps and easily connected with the simple reusable cable ties provided, they are used on a daily basis by many of the UK’s leading utility contractors to remove sediment which could otherwise pollute navigable water or drainage systems.

Constructed from a layered system of nylon mono-filament for capturing sediment particles down to 150µm, and a PVC nylon outer sleeve tested for tensile strength and durability, this rugged filter sock is built to handle repeated use in harsh conditions. It's possible to reuse the filter up to 20 times dependant on the geology of the sediment.

The GREEN RHINO® Heavy Duty Sediment Filter will retain 20kg of sediment before having to be emptied so it can be reused meaning its suited well for larger de-watering jobs.

With up to 400kg of sediment captured per filter and the ease of use, this is the professional utility contractors Sediment filter of choice.

Features :

• Save Money – No Vacuum Tankering Required
• Filter holds up to 20kg of sediment for single person handling
• Simply empty and reuse up to 20 times
• Water is discharged to Environment Agency accepted levels (150µm)
• Integral hydrocarbon detector alerts you to oil-based contaminants
• Easy to attach, use and empty
• Lifting straps for safe and easy handling
• Highly visible colour to avoid trips

Multi Function PVC Containment Bund (2500x1500x250mm)

Multi Function PVC Containment Bund (2500x1500x250mm) || 25Hx150Wx250L 937ltr || SKU: 1000373 || MPN: EB4 || Brand: Romold

EB4 + EB4M pictured (EB4M sold separately)

Our PVC portable bunds are easy to store and transport, quick to assemble and are compatible with hydrocarbons and a wide range of chemicals (compatibility information available upon request). These portable bunds are the ideal solution to your containment needs when a standard spill pallet is impractical.

Welded PVC construction. Aluminium support brackets. Turn buckle connectors. No tools required. Easy and quick to load and unload.

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Oil and Sediment Dewatering Filter - Holds 20kg / 2.5 Litres - 150 Micron

Oil and Sediment Dewatering Filter - Holds 20kg / 2.5 Litres - 150 Micron || SKU: 1000442 || MPN: GRR 01 05 20 SEDO || Brand: Green Rhino®

Designed for use when pumping and de-watering trenches, manholes, bunds and excavations, these filters are easy to use on-site, cost-effective and offer exceptional return on investment. Suitable for use with all standard mobile water pumps and easily connected with simple reusable cable ties provided, they are used on a daily basis by many of the UK’s leading utility contractors to remove contaminants such as oil and sediment which could otherwise pollute navigable water or drainage systems.

The GREEN RHINO® Oil and Sediment Filter has been constructed from a multi-layered filter system of nylon mono-filament for capturing sediment particles, and layers of polypropylene non-woven material for oil absorbency. With a PVC nylon outer sleeve tested for tensile strength and durability, this rugged filter is built to handle repeated use in harsh conditions.

It is possible to re-use this filter up to 20 times depending on the geology of the sediment being filtered or until the hydrocarbon detector turns a dark blue which indicates the filter has absorbed 2.5L of Oil. The filter will retain 20kg of sediment before having to be emptied so it can be reused.

Perfectly suited for large de-watering jobs where oil might be present in the water, this is the professional utility contractors Sediment filter of choice.

Features :

• Save Money – No Vacuum Tankering Required
• Retains 2.5L of oil sheen
• Filters 20kg of sediment for single person handling
• Simply empty and reuse up to 20 times or until integral hydrocarbon detector turns dark blue
• Water discharged to Environment Agency accepted levels (150µm)
• Highly visible colour to avoid trips

Multi Function PVC Containment Bund (1500x1500x250mm)

Multi Function PVC Containment Bund (1500x1500x250mm) || 25Hx150Wx150L 562ltr || SKU: 1000374 || MPN: EB3 || Brand: Romold

EB3 + EB3M pictured (EB3M sold separately)

Our PVC portable bunds are easy to store and transport, quick to assemble and are compatible with hydrocarbons and a wide range of chemicals (compatibility information available upon request). These portable bunds are the ideal solution to your containment needs when a standard spill pallet is impractical.

Welded PVC construction. Aluminium support brackets. Turn buckle connectors. No tools required. Easy and quick to load and unload.