If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email email@example.com
A swim-bed reactor using the biofringe acryl-fiber biomass carrier was used for partial nitritation treatment for anaerobic digestion liquor of swine wastewater. The sludge in the reactor demonstrated excellent settling properties, and the sludge volumetric index (SVI) was always about
50 ml g−1. The mixed liquor suspended solids (MLSS) concentration was maintained above 10,000 mg l−1 with a maximum of 16,800 mg l−1. Satisfactory and stable partial nitritation was obtained at a nitrogen loading rate (NLR) of
1.9 kg-N m−3 d−1 without any operational control. Only a little nitrate was produced almost during the whole operational period and the nitrite to total oxidized nitrogen ratio (NO2-N/(NO2-N + NO3-N)) was always above
95%. In addition, the influence of temperature on partial nitritation efficiencies was also investigated and noncontrolled efficiencies were maintained stably between 15°C and 30°C at a NLR of 1.9 kg-N m−3 d−1, but suddenly deteriorated when
the temperature fell below 15°C. Nitrite oxidizing bacteria were inhibited by free ammonia and free nitric acid, which prevented the conversion of nitrite to nitrate and the inhibition due to free nitric acid weaken with a decrease in temperature. It was apparent that these phenomena were
crucial to the control of partial nitritation treatment.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.