Mass replacement is currently the most commonly used method of soil remediation. The contaminated soil is removed and, if necessary, pre-processed on the site in order to separate waste from mineral aggregates. The soil masses are then deposited according to their harmful substance content and suitability for further use. The method can create substantial cost benefits as some of the soil may be utilised on the site. Each site is planned on a case-by-case basis, and the authorities and environmental specialists decide which remediation method is to be used. We conduct demanding soil remediation projects every year in challenging environments and sites of varying scope. We have the best resources for the processing of masses and excavation water.
Soil must often be processed by means of sieving in mass replacement projects and in storage areas of surplus soil. Any soil and mineral aggregates that may be contaminated or be a mixture of various types or contain waste may be sieved to the desired fractions. The quality of sieving can be determined as necessary by changing the sieve levels or mesh sizes in order to separate the different fractions. Fine aggregate, mineral aggregates, waste and magnetic metals, for example, can be separated from the soil. We have different kinds of mobile sieving equipment which allow efficient operations and are suitable for various areas of application and work sites.
We remediate the contaminated soil for reuse using the stabilisation method. This both conserves the environment and reduces the need for clean soil. Stabilisation may also be used on the site when processing large volumes of soil.
In the Ekostab method, the harmful substances are bound by mixing a binder to cold, contaminated soil. Bitumen, a hydraulic binder or a combination of the two is used as the binder. The binder is selected based on the harmful substances and the properties of the contaminated soil.
In the Ekofalt method, the harmful substances contained in the contaminated soil are bound within an asphalt structure using bitumen as the binder. The properties of the spread and compacted Ekofalt structure resemble those of asphalt.
We implement landfill construction projects based on our experience and professional skills, both in the case of constructing a new landfill or closing an existing one. We have extensive competence in the fields of foil, compaction or landfill gas collection structures.
Overturning of piles
Composting takes place faster when the piles of organic waste are as airy as possible. YIT’s top modern pile overturner has been developed for organic waste in particular. It turns over 5,000 cubic metres of pile per hour, while the more traditional methods only reach a fraction of this volume. This enhances the utilisation of pile areas. The pile overturners can also be used for the piling and mixing of various types of substances, such as ash, slurry and fibre slurry from forest industry as well as soil materials which can be mixed.