DEKONTA specialists have verified the following innovative methods of soil rehabilitation on a model, semi-operating and, in some cases, operating scale:
In-situ intensified biodegradation
this term includes several methods which intensify in a different manner in-situ biodegradation performed in a standard manner; it mainly concerns:
- installation of inclined and horizontal bores for de-aeration of the unsaturated zone and dosing of the bioproduct and nutrients into the rock environment
- application of oxidation agents on the basis of magnesium peroxide, which releases oxygen over an extended period into the rock environment
- controlled alternation of anaerobic and aerobic conditions in the unsaturated zone for the purpose of biological degradation of chlorohydrocarbons and PCB
- application of humic acids for support of bio-degradation processes running in the soil.
Washing of soil contaminated by organic and inorganic substances - the principle of the technology is the same as in the case of washing of wastes; in the case of in-situ use of this method, the washing solution is applied into the system of penetrating drainage channels and/or bores or by spraying on the surface of the terrain. A hydraulic barrier serves for its collection created from the line of pumped bores suitably installed in the direction of flow of groundwater.
In-situ chemical oxidation is again analogous to chemical oxidation of wastes. In the case of application of this in-situ technology, the oxidation agent is applied into the contaminated unsaturated zone by means of special equipped shallow probes. With respect to the risk of penetration of the oxidation agent into the groundwater and the related negative environmental and health impacts, this method pays extraordinary attention to consistent preparation of rehabilitation.
Phytomediation is a technology based on the ability of plants to absorb, stabilise or metabolise contamination present in groundwater or soil. Plants are used during decontamination of water or soil contaminated either by heavy metals, organic substances or radionuclides. For the purpose of phytomediation, plants are selected whose advantage is fast increment of biomass and which are able to vegetate in the conditions of the specific rehabilitated localities.
The mentioned methods are gradually prepared for operating implementation and at the present time the approval procedure by the competent state administration bodies and the elaboration of internal methodological regulations are in progress.