Microbiological Treatment of air Scrubber Solutions From a Waste Incineration Plant and Other Mercury Contaminated Waste-Water: A Technology in Search of an Application
Johannes Leonhäuser, Wolf-Dieter Deckwer and Irene Wagner-Döbler
from: Bioremediation of Mercury: Current Research and Industrial Applications (Edited by: Irene Wagner-Döbler). Caister Academic Press, U.K. (2013)
A microbiological treatment system comprising three consecutive stages of packed bed bioreactors inoculated with mercury reducing bacteria was operated in laboratory scale. The efficiency of this system for removal of mercury from the following types of industrial wastewater were determined: (1) chlor-alkali electrolysis; (2) gas scrubber solutions from the waste incineration plant TAMARA; (3) gas scrubber solutions from incineration of various types of waste from a chemical factory. The data show that all three types of wastewater could be efficiently cleaned. Factory wastewater with mercury concentrations of up to 460 mg/L had to be diluted to obtain a mercury concentration < 10 mg/L. Treatment efficiency was reduced by chloride concentrations above 39 g/L or toxic compounds, which were present in one of the wastewater batches from the chemical factory. The sandfilter buffered transient changes in the bioreactor efficiency. The activated carbon filter functioned as a polishing step so that effluent concentrations below 50 µg/L could always be maintained. The best and most stable bioreactor performance was obtained for electrolysis wastewater, which has a relatively predictable composition read more ...