Possibility of Nitrogen Removal from Animal Wastewater by a Bioelectrochemical Process
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Accession number;03A0395294
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| Title;Possibility of Nitrogen Removal from Animal Wastewater by a Bioelectrochemical Process |
| Author;
TANAKA TSUNEO
(Maebashi Inst. Technol., JPN)
OZAKI MASUO
(Maebashi Inst. Technol., JPN)
HIRANO NORIHIKO
(Gunmakankyogijutsukonsoshiamu)
KURODA MASAO
(Gunma Univ., Faculty of Engineering, JPN)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.224;PAGE.213-220(2003)
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| Figure&Table&Reference;FIG.9, TBL.4, REF.10 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In Gunma Prefecture, animal waste is the major source of nitrogen load. An activated sludge plant has been constructed to decrease the nitrogen load generated from the animal waste. However, nitrogen removal efficiency of the activated sludge plant is not necessarily high. Total nitrogen concentration of the secondary treatment wastewater from the plant is still high at more than 100mg/L (water quality standards). The reason is probably a lack of electron donor in the activated sludge tank. Accordingly, a bioelectrochemical reactor was developed to remove nitrogen from the secondary treatment wastewater. The bioelectrochemical reactor consisted of an anode and cathode units and a packed bed of biological activated carbon. A platinized titanium mesh was set into the anode unit and connected with a DC power supply by lead wire. A polypropylene medium was also packed into the anode unit. A carbon-felt was set into a plastic basket and used as cathode. Electric current was applied between anode and cathode units to generate oxygen and hydrogen. Nitrification and denitrification rates in the reactor were increased with increasing electric current. The nitrification and denitrification rates could be enhanced by supplying oxygen and hydrogen by electrolysis of water, respectively. In addition, the biological reaction rates could be controlled by current intensity. When electric current of 2.0A was applied, total nitrogen concentration of the effluent from the reactor was decreased by less than 50mg/L at the HRT of 48 hours, and the nitrogen removal efficiency was increased up to about 60%. These results showed that the bioelectrochemical process was useful for nitrogen removal from the secondary treatment wastewater. (author abst.) |
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