Journal
WATER RESEARCH
Volume 68, Issue -, Pages 580-588Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.10.033
Keywords
Thermally hydrolyzed wasted sludge (THWS); Electrolyzed water system (EWS); Ammonia stripping; Anaerobic digestion; Ammonium nitrogen
Funding
- R&D Center for Organic Wastes to Energy Business (under the Wastes to Energy Technology Development Program) - Ministry of Environment, Republic of Korea
- Research Development Program [AGEC 12-3-30-52]
- Korea Environmental Industry & Technology Institute (KEITI) [ARQ201312010003] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [21A20132012107] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, the anaerobic digestion of thermally hydrolyzed wasted sludge (THWS) with a high concentration of ammonia was carried out through combining with an ammonia stripping and an electrolyzed water system (EWS). The EWS produced acidic water (pH 2-3) at the anode and alkaline water (pH 11-12) at the cathode with an electro-diaphragm between the electrodes that could be applied to ammonia stripping. The ammonia stripping efficiency was strongly dependent on the pH and aeration rate, and the ammonium ion removal rate followed pseudo-first-order kinetics. From the BMP test, the methane yield of THWS after ammonia stripping using the EWS was 2.8 times higher than that of the control process (raw THWS without ammonia stripping). Furthermore, both methane yield and ammonium removal efficiency were higher in this study than in previous studies. Since ammonia stripping with the EWS does not require any chemicals for pH control, no precipitated sludge is produced and anaerobic microorganisms are not inhibited by cations. Therefore, ammonia stripping using the EWS could be an effective method for digestion of wastewater with a high concentration of ammonium nitrogen. (C) 2014 Elsevier Ltd. All rights reserved.
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