Technology for remediation of polluted soil with organochlorinated pesticides
A Romanian research institute has developed a new technology for remediation of soil polluted with organochlorinated pesticides which belong to the category of persistent organic pollutants.This technology can be used in-situ or ex-situ and is a treatment method of consecutive chemical oxidation and biological processes. The Romanian research institute is looking for a company interested in a technical cooperation agreement or a commercial agreement with technical assistance.
The Romanian research team is looking for companies interested in acquiring this technology for commercial exploitation: • License agreements • Funding opportunities to develop new applications accommodated to the specific needs of the company; • Technology Transfer and Knowledge Transfer Agreements.
This technology can be use on-situ or ex-situ and is a treatment method in two phases by chemical oxidation and biological processes. Remediation efficiency is higher to those which have one treatment phase from above mentioned it.The process consists in the treatment of organochlorinated pesticides soil polluted, ex-situ or on-site, by combining chemical oxidation with hydrogen peroxide or hydrogen peroxide and calcium peroxide with biological sequentially treatment leading to over 90% pesticides removal efficiencies. Hexachlorocyclohexane (lindane - comercial label ) and DDT past fabrication together with the presence of industrial landfills with inactive HCH isomers (which are not use for TCB fabrication) generate long-term issuess because of long time presence in soil (historical pollution). Hexachlorocyclohexane (HCH) is a mixture of stereo isomers, HCH (lindane) being the best known because its aplication in agriculture field. The resulted product after benzene chlorination contains aprox. 14% gamma HCH isomer and 86% inactive isomers: 65-70% HCH, 14-15% HCH, 7%, HCH 1-2%, HCH 1-2%, other compounds. For each tone of lindane the fabrication process generares 8 - 12 tones of inactive isomers which are waste. Although, in Romania lindane and DDT production has been stoped for a long time, they are still present in soil, sediments and water in the landfills proximity. The presence of this pesticide class was identified in surface waters and sediments in many areas because of application on large scale in agriculture, long time persistence in soil, wind transportation, underground water and torrents. Conventional methods for soil treatment include excavation and incineration, thermal desorbtion, microwave, extraction with supercritical liquides a.s.o. and bioremediation (which is cheaper and less distructive). The offered soil remediation technology was elaborated in order to introduce in the field of environmental technology market an innovative method for removal of organochlorinated compounds from historical polluted soils (areas with former chemical synthesis plant). However, despite the Romanian fabrication ending of organochlorinated pesticides as hexachlocyclohexane (HCH) isomers, dichlorodiphenyltrichloroethane (DDT) and their derivate: dichlorodiphenyldichloroethane (DDD) and dichlorodiphenyldichlorethene (DDE), due to toxicity for fauna and plants, these pollutants are still present in soil, sediments and water in the proximity of former synthesis installations because of inadequate disposal of industrial waste. Remediation technology consist in ex-situ (polluted soil is excavated and transported for the treatment in another location) or on-site treatment (soil treatment in the same location after excavation) of organochlorinated polluted soils, gradually, combining chemical oxidation process with hydrogen peroxide or hydrogen and calcium peroxide with sequential biological remediation, with additional amount of carbon source, type molasses, in alternating cycles of aerobic-anaerobic, leading to pesticides removal efficiencies over 90%. The supplier of this technology has experience in the field of advanced remove of persistent organic pollutants, including organochlorinated pesticides, by physical-chemical and biological methods being the owner of some patents in the domain and many collaboration relations with national and international research entities for environmental technologies applications. The Romanian research institute is looking for a company interested for technical cooperation agreement and for commercial agreement with technical assistance.
Advantages and innovations
1.1. The main advantages • Catalytical oxidation reactions of HCH isomers and DDT derivatives with hydrogen peroxide in the presence of ferrous ions take place with high speed leading to the diminishing of degradation time comparing with chemical reduction with zero-valent iron; • Controlled dossage of hydrogen peroxide during entire process assures an efficient consumption of the oxidant reagent. In case of acid soils, it can be used calcium peroxide as oxidant reagent together with hydrogen peroxide, having the additional role of pH correction in the admitted range for the following biological processes; • Dosage of the solid catalyst has a positive effect on DDT byproducts degradation; • Working at natural soil pH favors the following biological degradation processes of residual pesticides content and oxidation byproducts, in anaerobical - aerobical sequences, in the presence of molasses as aditional carbon source - biostimulator for microbial mass and co-carrier in the process of pollutantants degradation; • Aerobical-anaerobical sequencial process in optimal conditions (humidity, nutrients concentrations, oxigen concentration) for growth stimulation of bacteria specific consortium can assures advanced removal efficiency, to complete mineralization, of organochlorinated pesticides; • No subsequent (secondary) pollution; • Applicable to any type of soil; • Minimal infrastructure investition (open reactors, mechanical homogenization); • Easy opperation; • High pollutants removal yields (>90%) • Availability for automation; • Availibility for in-situ remediation conversion. 1.2. Innovative aspects • Combined remediation method based on physical-chemical oxidative processes and biological in sequencially system; • Chemical oxidation phase assures 50% efficiency removal of HCH and DTT after 24 h; • Biological treatment phase in aerobic-anaerobic cycles assures over 90% removal of HCH and DTT.
Available for demonstration
Intellectual Property Rights (IPR)
Secret Know-how,Patents granted
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