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      <marc:subfield code="b">process uses pre-treatment to improve the production of biogas from organic biosolids.</marc:subfield>
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      <marc:subfield code="a">"December 2017."</marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Optimisation du traitement des boues municipales : recours au prétraitement des boues d’épuration pour accroître le volume de biogaz produits par la digestion des biosolides.</marc:subfield>
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      <marc:subfield code="a">"The NRC has the unique combination of technical and scientific expertise that municipalities need to optimize wastewater treatment by optimizing the biogas produced during anaerobic digestion"--p. [1].</marc:subfield>
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