期刊
BIORESOURCE TECHNOLOGY
卷 337, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125420
关键词
Polyhydroxyalkanoates (PHA); Waste activated sludge; Nitrification; Dissolved oxygen; Sinultaneous nitrification and denitrification (SND)
资金
- Dutch Ministry of Economic Affairs
- Dutch Ministry of Infrastructure and Environment
- European Union Regional Development Fund
- Province of Fryslan
- Northern Netherlands Provinces
- European Union [665874]
- Paques BV
- STOWA
- SNB
- Marie Curie Actions (MSCA) [665874] Funding Source: Marie Curie Actions (MSCA)
Research has shown that controlling the dissolved oxygen concentration in microbial community-based PHA production can reduce the activity of nitrifying bacteria while promoting PHA production. By utilizing the oxygen provided by nitrifying bacteria to supply the nitrate required for PHA production, maximum PHA production rates can be maintained.
Microbial community-based polyhydroxyalkanoate (PHA) production has been demonstrated repeatedly at pilot scale. Ammonium, normally present in waste streams, might be oxidized by nitrifying bacteria resulting in additional aeration energy demand. The use of low dissolved oxygen (DO) concentrations allowed to reduce nitrifying rates by up to 70% compared to non-oxygen limiting conditions. At lower DO concentrations nitrate was used as alternative electron acceptor for PHA production and therefore, a constant PHA production rate could only be maintained if nitrate was sufficiently available. An optimum DO concentration (0.9 mgO2/L) was found for which nitrification was mitigated but also exploited to supply requisite heterotrophic nitrate requirements that maintained maximum PHA production rates. PHA accumulations with such DO control was estimated to reduce oxygen demand by about 18%. This work contributes to establish fundamental insight towards viable industrial practice with the control and exploitation of nitrifying bacteria in microbial communitybased PHA production.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据