Six months treatment cut 95% of priority PAH pollutants from coke oven effluent
Six months treatment cut 95% of priority PAH pollutants from coke oven effluent. Citadel Biocat+TM provided the bioremediation in situ ot 150,000 cubic meters of contaminated soil at a decommissioned coke oven effluent lagoon. Several decades of steel production had created a residue of significant amounts of polycyclic aromatic hydrocarbons (PAH's), along with soluble components such as cyanide, phenols and ammonia.
Details
Cost studies indicoted thot that bioremediation followed by stabilisation of inorganics and establishment of vegetation was the cheapest option. Citadel Biocat+TM was included in the bioremediation protocol having provided in earlier tests a natural solution to breaking down gelatinous sludge from the bottom of the lagoon.
The lagoon was dried out and the tarry sludges and contaminated soils excavated and formed into windrows within the confines of the original lagoon. 20% by volume of hay and organic compost was added to the top of the piles and was mixed together using a self propelled windrow machine.
At the same time 25 litres of Citadel BioCat+TM 8% solution with 0.05% surfactant was sprayed per cubic meter of soil. The windrows were turned periodically (circa four to six weekly) and additional applications of Citadel BioCat+TM 8% solution with 0.05% surfactant were made at 25 litres per cubic meter of soil. After four to six months there was no visible tarry material in the windrows and analysis showed that priority PAH pollutants had been reduced in volume by at least 95%. PAH`s eliminated to less than 0.05% of original volumes were Benzofa} anthracene, Flouranthene and Phenanthrene, whilst the lowest remaining volume percentage of a PAH was Benzojpyrene} at 11.3%.
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