Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 410156
Title Rumen stoichiometric models and their contribution and challenges in predicting enteric methane production
Author(s) Alemu, A.W.; Dijkstra, J.; Bannink, A.; France, J.; Kebreab, E.
Source Animal Feed Science and Technology 166-167 (2011). - ISSN 0377-8401 - p. 761 - 778.
Department(s) Animal Nutrition
LR - Backoffice
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) lactating dairy-cows - volatile fatty-acids - midrib-3 corn-silage - grain endosperm type - high-moisture corn - ruminal digestion kinetics - whole-crop wheat - grass-silage - milk-production - nutrient digestion
Abstract Black (toilet) water contains half of the organic load in the domestic wastewater, as well as the major fraction of the nutrients nitrogen and phosphorus. When collected with vacuum toilets, the black water is 25 times more concentrated than the total domestic wastewater stream, i.e. including grey water produced by laundry, showers etc. A two-stage nitritation–anammox process was successfully employed and removed 85%–89% of total nitrogen in anaerobically treated black water. The (free) calcium concentration in black water was too low (42 mg/L) to obtain sufficient granulation of anammox biomass. The granulation and retention of the biomass was improved considerably by the addition of 39 mg/L of extra calcium. This resulted in a volumetric nitrogen removal rate of 0.5 gN/L/d, irrespective of the two temperatures of 35 °C and 25 °C at which the anammox reactors were operated. Nitrous oxide, a very strong global warming gas, was produced in situations of an incomplete anammox conversion accompanied by elevated levels of nitrite.
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