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Effects of Pre-aeration on the Anaerobic Digestion of Sewage Sludge
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  • Journal title : Environmental Engineering Research
  • Volume 19, Issue 1,  2014, pp.59-66
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.19.1.059
 Title & Authors
Effects of Pre-aeration on the Anaerobic Digestion of Sewage Sludge
Ahn, Young-Mi; Wi, Jun; Park, Jin-Kyu; Higuchi, Sotaro; Lee, Nam-Hoon;
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The aim of this study was to assess the effect of pre-aeration on sludge solubilization and the behaviors of nitrogen, dissolved sulfide, sulfate, and siloxane. The results of this study showed that soluble chemical oxygen demand in sewage sludge could be increased through pre-aeration. The pre-aeration process resulted in a higher methane yield compared to the anaerobic condition (blank). The pre-aeration of sewage sludge, therefore, was shown to be an effective method for enhancing the digestibility of the sewage sludge. In addition, this result confirms that the pre-aeration of sewage sludge prior to its anaerobic digestion accelerates the growth of methanogenic bacteria. Removal rates for -N and T-N increased simultaneously during pre-aeration, indicating simultaneous nitrification and denitrification. The siloxane concentration in sewage sludge decreased by 40% after 96 hr of pre-aeration; in contrast, the sulfide concentration in sewage sludge did not change. Therefore, pre-aeration can be employed as an efficient treatment option to achieve higher methane yield and lower siloxane concentration in sewage sludge. In addition, reduction of nitrogen loading by pre-aeration can reduce operating costs to achieve better effluent water quality in wastewater treatment plant and benefit the anaerobic process by minimizing the toxic effect of ammonia.
Anaerobic digestion;Pre-aeration;Sewage sludge;Siloxane;Solubilization;
 Cited by
공기주입과 영가철을 이용한 하수슬러지 가용화 연구,김용준;박진규;타메다 카즈오;이남훈;

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