Abstract：
:A full-scale biodrying installation was treating 150 kton (wet weight) of dewatered waste activated sludge per year. The waste was treated at thermophilic conditions (65-75 °C) in a 2-step forced aeration process reducing the total wet sludge weight by 73%. The final product had a high caloric value (7700-10,400 (kJ/kg)), allowing a combustion for energy generation in external facilities. The resulting product met the European microbial and heavy metal quality standards needed for an application as organic fertilizer. The facility used <0.5 MW of electricity and recovered 9.3 MW from biologically produced heat, which was internally used for the heating of office buildings. Produced ammonia, originating from the microbial conversion of organic matter, was recovered from the ventilated air in an acid gas scrubber as an ammonium sulphate solution 40% (w/w) (7.3 kton/year) and was sold as substitute for artificial fertilizers. The sustainability of this process is discussed relative to other sludge handling processes.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Winkler MH,Bennenbroek MH,Horstink FH,van Loosdrecht MCM,van de Pol GJdoi
10.1016/j.biortech.2013.07.138subject
Has Abstractpub_date
2013-11-01 00:00:00pages
124-129eissn
0960-8524issn
1873-2976pii
S0960-8524(13)01206-6journal_volume
147pub_type
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