Colonization strategies to establish microscopic biofilm reactors for simultaneous nitrification/denitrification
نویسندگان
چکیده
In biological wastewater treatment technologies the majority of systems are based on activated sludge technology. In these systems the population structure and dynamics of the activated sludge microbial community is largely governed by indirect regulatory mechanisms, such as aerated/nonaerated reactors, reactor configurations and sludge recycling ratios. The build-up of activated sludge flocs (bacterial aggregates) that are the key elements of the wastewater treatment process remains uncontrolled. The project started to overcome these problems by the introduction of artificial microstructures (microscopic carrier structures) to which the activated sludge bacteria adhere and meet technological objectives. In this paper the results of simultaneous nitrification and denitrification technology is presented on the basis of laboratory scale results. Application of two inoculation techniques (in consecutive steps) made possible the coexistence of ammonium oxidizer (nitrification) and nitrate reducer (denitrification) bacteria in the same bioreactor volume. In spite of the contradictory environmental requirements of the two bacterial consortia (i.e., dissolved oxygen concentration) the developed experimental set up enabled the simultaneous functioning of the two groups showing high efficiency in terms of nitrogen removal.
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