Why On Site Storage Matters
Between the moment hazardous waste is generated and the moment it is collected, it must be stored somewhere on site, and how it is stored during this period has a large bearing on safety and compliance. Much of the risk associated with hazardous waste arises during storage, from leaks, spills, deterioration, or incompatible materials reacting, so storing it correctly is among the most important practical aspects of hazardous waste management. Good storage prevents incidents that poor storage invites.
Many operations in the UAE generate hazardous waste, used oils, solvents, chemicals, contaminated materials and more, and need to store it safely on site before it is collected for treatment or disposal. This article sets out the practical principles of safe hazardous waste storage, the containers, segregation, containment, labelling, ventilation and documentation that keep stored hazardous waste safe, to help operations store their hazardous waste correctly. It is written as general guidance, with specifics to be confirmed with the relevant authority.
The aim of hazardous waste storage is simple, to hold the waste safely and securely until it is collected, with nothing leaking, reacting or escaping, and with the waste clearly identified and documented. The practices that achieve this are straightforward, and applying them consistently keeps stored hazardous waste safe.
Suitable Containers in Good Condition
Hazardous waste should be stored in containers suited to the waste and in good condition. The container must be compatible with the waste it holds, since some wastes can corrode or react with unsuitable containers, and it must be sound, without damage or deterioration that could cause a leak. Containers should be kept closed when not in use, to prevent spills, evaporation and the entry of incompatible materials, and should not be overfilled.
Using the right container for each hazardous waste is a basic but important practice, because an unsuitable or damaged container is a common cause of leaks and spills. Inspecting containers so that any deterioration is detected early, before it becomes a leak, is part of good storage, allowing a failing container to be replaced before it causes an incident. Sound, suitable, closed containers are the first line of defence in hazardous waste storage.
Separating Incompatible Wastes
A critical aspect of hazardous waste storage is keeping incompatible wastes separated, so they cannot come into contact and react. Some hazardous wastes react dangerously if they mix, producing heat, gas, fire or toxic substances, so wastes that are incompatible, such as acids and alkalis, or oxidisers and flammable materials, must be stored apart from each other. Understanding which of an operation's hazardous wastes are incompatible is essential to storing them safely.
Segregation in storage means arranging the storage area so incompatible wastes are kept separate, with enough separation or barriers that an accidental leak from one cannot reach another. This prevents the dangerous reactions that mixing incompatible wastes can cause, which are among the more serious hazardous waste incidents. Keeping hazardous wastes separated by compatibility is a core principle of safe storage that should never be overlooked.
Secondary Containment and Bunding
Secondary containment, such as bunding, is a critical safeguard in hazardous waste storage, catching any leak or spill before it can spread, reach drains or watercourses, or harm the environment. Bunding is a barrier or bund around the storage that holds any escaped liquid, so that a leaking container does not result in a spill spreading across the site. It is particularly important for liquid hazardous waste, where a leak without containment could quickly become a serious spill.
Providing secondary containment for stored hazardous waste, sized to hold a credible leak, turns a container failure from a potential incident into a contained event. Combined with sound containers and an orderly storage area, containment ensures that even if a container does leak, the consequences are limited. For operations storing liquid hazardous waste in particular, secondary containment is an essential part of safe storage.
A Designated, Secure, Ventilated Area
Hazardous waste should be stored in a designated area set aside for the purpose, rather than scattered around the operation. The area should be secure, with access limited to those who need it, so that hazardous waste cannot be disturbed, removed or interfered with. It should be away from drains, watercourses and ignition sources, so that a leak cannot reach the environment and flammable wastes are not near sources of ignition, and it should be well ventilated where the wastes require it.
Locating hazardous waste storage thoughtfully, in a secure, designated, suitably ventilated area away from drains and ignition sources, prevents many of the ways storage can go wrong. The area should be kept orderly, so that containers can be inspected and any leak detected, and clearly marked as a hazardous waste storage area. A well chosen, well kept storage location is central to safe hazardous waste storage.
Clear Labelling and Identification
Stored hazardous waste should be clearly labelled, so that everyone knows what each container holds and the hazards it carries. Labels should identify the waste and its hazardous properties, so that containers are not mistaken for general waste, are handled with the right precautions, and are kept separate from incompatible wastes. Clear labelling supports every other aspect of safe storage, from correct handling to segregation.
Identification also supports the documentation that accompanies hazardous waste, since knowing what each container holds is the basis for recording it. Labels should be durable and remain legible in the storage conditions, so they do not deteriorate and leave a container unidentified. Clear, durable labelling of stored hazardous waste is a simple practice that underpins its safe storage and handling.
Inspection and Documentation
Safe hazardous waste storage includes regular inspection and basic records. Inspecting the storage area periodically allows any leak, deterioration or problem to be detected and addressed early, before it becomes an incident, and keeps the area orderly and safe. Inspection is a simple practice that catches the problems, a failing container, a developing leak, that cause storage incidents when they go unnoticed.
Basic records of what hazardous waste is stored, in what quantity and from when, support both safe management and the documentation that accompanies the waste when it is collected and moved. These records help an operation manage its stored hazardous waste, track how long it has been stored, and provide the basis for the chain of custody documentation when it is collected. Inspection and records complete the practices that keep stored hazardous waste safe and accounted for.
Safe Storage at a Glance
Suitable, sound containers
Compatible containers in good condition, kept closed and not overfilled, inspected so leaks are caught early.
Separate incompatibles
Keep incompatible wastes apart so they cannot contact and react dangerously.
Provide containment
Secondary containment such as bunding catches leaks before they spread, especially for liquids.
Designate, label and inspect
A secure, ventilated, designated area, clearly labelled containers, and regular inspection.
Hazardous Streams Requiring Safe Storage
These hazardous streams require the safe storage practices described above before collection.
How Nazafah UAE Supports Safe Hazardous Storage
Nazafah UAE supports operations in storing and managing their hazardous waste safely, advising on safe storage practices, collecting stored hazardous waste in appropriate containment, and routing it to correct treatment, recovery or licensed disposal, with documentation maintaining the chain of custody. By collecting hazardous waste reliably, we help ensure it does not accumulate in storage longer than necessary, reducing the risk that prolonged storage can carry.
We help operations understand the hazardous wastes they generate and how to store them safely before collection, and we handle the collection, transport and treatment with the care their hazards require. The specific storage arrangements and any approvals appropriate to a particular hazardous waste and site are best confirmed with the relevant authority and can be discussed with our team.
- Advice on safe storage of the hazardous waste you generate
- Reliable collection so hazardous waste does not over accumulate
- Collection and transport in appropriate containment
- Routing to correct treatment, recovery or licensed disposal
- Documentation maintaining the chain of custody