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Forum » EMEP-EEA Guidebook discussions » Sludge spreading

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Author Topic: Sludge spreading 2543 Views
  • Carlo
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    Sludge spreading Link to this post

    Someone arise question about possible error in Guidebook 2009 NFR 6D Other waste regarding Tier 2 emission factors for sludge spreading in Table 3-2.

    There is no error in the Guidebook. The emission factor was derived from a previous version of Guidebook itself. In the old Guidebook version this description was contained:

    "The amount of ammonia produced by sludge spreading is determined by the dry matter content of the sludge and the total amount of ammoniacal nitrogen present. The dry matter content of a communal sludge may be between 4% (digested) and 5% (undigested). Recent results from the United Kingdom gave a percentage ammonia of about 5% of the total ammonia-nitrogen content of the sludge."

    So the data on the GB is consistent 5% = 50 g NH3/kg total ammonia-nitrogen content of the sludge.

    As all we know. this chapter was not updated during the last Guidebook edition but only reformatted.

    There are some more interesting data in US study "ESTIMATING AMMONIA EMISSIONS FROM ANTHROPOGENIC NONAGRICULTURAL SOURCES - DRAFT FINAL REPORT, April 2004."

    In this work we can found a value of 50 g/Mg wet digested sludge (rated as E - very high uncertainty).

    I will propose an update in the next year task force meeting.

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