Free ammonia pretreatment improves anaerobic methane generation from algae

WATER RESEARCH

卷:162

Article

Wang, Qilin^1,2  Sun, Jing²  Liu, Sitong³  Gao, Li⁴  Zhou, Xu²  Wang, Dongbo²  Song, Kang⁵  Nghiem, Long D.¹ 

[1] Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Ultimo, NSW 2007, Australia

[2] Univ Queensland, Adv Water Management Ctr, St Lucia, Qld 4072, Australia

[3] Peking Univ, Coll Environm Sci & Engn, Key Lab Water & Sediment Sci, Beijing 100871, Peoples R China

[4] South East Water, 101 Wells St, Frankston, Vic 3199, Australia

[5] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China

关键词: Algae;    Free ammonia;    Methane;    Energy;    Anaerobic digestion;    Biodegradability;   

DOI  :  10.1016/j.watres.2019.06.065

来源: Elsevier

【 摘 要 】

Anaerobic methane generation from algae is hindered by the slow and poor algae biodegradability. A novel free ammonia (NH3 i.e. FA) pretreatment technology was proposed in this work to enhance anaerobic methane generation from algae cultivated using a real secondary effluent. The algae solubilisation was 0.05-0.06 g SCOD/g TCOD (SCOD: soluble chemical oxygen demand; TCOD: total chemical oxygen demand) following FA pretreatment of 240-530 mg NH3-N/L for 24 h, whereas the solubilisation was only 0.01 g SCOD/g TCOD for the untreated algae. This indicates that FA pretreatment at 240-530 mg NH3-N/L could substantially enhance algae solubilisation. Biochemical methane potential tests revealed that FA pretreatment on algae at 240-530 mg NH3-N/L is able to significantly enhance anaerobic methane generation. The hydrolysis rate (k) and biochemical methane potential (P-0) of algae increased from 0.21 d(-1) and 132 L CH4/kg TCOD to 0.33-0.50 d(-1) and 140-154 L CH4/kg TCOD, respectively, after the algae was pretreated by FA at 240-530 mg NH3-N/L. Further analysis indicated that FA pretreatment improved k of both quickly and slowly biodegradable substrates, and also increased P-0 of the slowly biodegradable substrate although it negatively affected P0 of the quickly biodegradable substrate. This FA technology is a closed-loop technology. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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