In projects and when setting requirements for emission limits, it is crucial to have a clear understanding of the type of water being handled. This is important from several perspectives:

• To identify specific pollutants and risks

• To select the appropriate treatment methods

• To comply with applicable laws and regulations

• To assess the environmental impact

• To achieve efficient and cost-effective solutions

For example, stormwater may contain oils and heavy metals, while dewatering water from construction sites often has high levels of soil particles and metals. Therefore, different treatment and treatment methods are required depending on the water’s characteristics.

By identifying the type of water being handled, the most efficient and cost-effective treatment technique can be selected, which improves the treatment process and saves resources. This also ensures compliance with relevant laws and regulations, minimizing legal risks and potential fines. Finally, it contributes to protecting our environment.

So, what types of water do we handle in our projects? Here are the four main water characteristics we refer to:

1. Dewatering Water

Dewatering water, or groundwater control water, is a common term in certain sectors, especially in construction and civil engineering. There is no legal definition of dewatering water, but it generally refers to water that is diverted from some form of human activity. In practice, this includes rainwater, infiltrating groundwater, and process water generated during excavation, blasting, and drilling, such as in earthworks, quarries, and mines.

2. Stormwater

Stormwater is rain or meltwater that runs off roofs, roads, and other impervious surfaces. If it rains heavily or the snow melts quickly, stormwater can collect pollutants from these surfaces, such as oils, heavy metals, chemicals, and debris, before it continues to flow and eventually reaches water bodies, lakes, or even groundwater.

3. Industrial Stormwater

Industrial stormwater primarily refers to rainwater that has come into contact with industrial activities and surfaces. Recycling facilities, for example, are one industry where dissolved metals are found in industrial stormwater, which must be treated before being discharged.

4. Process Water

Process water is water used in industrial processes such as manufacturing, cooling, or cleaning. After use, process water may be contaminated with chemicals, oils, heavy metals, or other pollutants generated during the industrial process.