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Removing nitrogen during the anaerobic digestion of poultry wastes using physical methods

We need to improve how Anaerobic Sequencing Batch Reactor (ASBR) operates to make it economically viable. One big problem with the degradation of chicken manure has been ammonia accumulations. We solve this problem by an integrated system that removed ammonia at short periods of time from the effluent of an ASBR.

Biogas from chickenmanure produced by anaerobic digesters is as a potential source of heat andenergy. Digesters in dry and wet conditions have a problem in with ammonia accumulations higher than 8-13 gL^-1 of unionized ammonia and ammonium anions have to be avoided to eliminate the inhibition of methanogenesis. We were able to reduce ammonia level by combining different physicochemical methods such as vacuum and temperature in a degassing packed column operated as a trickling system. The trickling flow ensured good distribution and long contact times of the effluent with the packing material. An ASBR was operated to treat chicken manure; subsequently, the effluent was introduced in a degassing column where 83-87% of ammonia was eliminated after one hour. Around 15 g of ammonia could be obtained from 4 liters of effluent with 4 gk^-1 of ammonium. Eliminating ammonia allowed us to reuse the effluent of the degassing column. This effluent was mixed with raw chicken manure to prepare the substrate for the ASBR. This made it possible avoid using extra water in the operation of the digester; moreover, the efluent with its pH of 9 not only functioned as a buffer for the ASBR, it also helped to eliminate ammonia in the degassing column. This was because during the ammonia removal, the pH increased from 8 to 9. Using constant degasifications, we were able to maintain an ammonium concentration in the reactor of approximately 4 gkg^-1; therefore at an organic rate of 6.6gVSL^-1 we could achieve a biogas yield of 300 Lkg^-1 _VS with a percentage of 64-58% methane.

Copyright:	© Deutsche Gesellschaft für Abfallwirtschaft e.V. (DGAW)
Quelle:	4. Wissenschaftskongress März 2014 - Münster (März 2014)
Seiten:	5
Preis:	€ 2,50
Autor:	Violeta Bravo Sepúlveda Prof. Dr.-Ing. habil. Günter Busch
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