Post treatment of swine anaerobic effluent by weak electric field following intermittent vacuum assisted adjustment of N:P ratio for oil-rich filamentous microalgae production

Shuhao Huo, Junzhi Liu, Feifei Zhu, Sajid Basheer, David Necas, Renchuan Zhang, Kun Li, Dongjie Chen, Pengfei Cheng, Krik Cobb, Paul Chen, Bailey Brandel, Roger Ruan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A weak electric field (EF) was applied to decolorize the swine anaerobic effluent, which was followed by N:P ratio adjustment via intermittent-vacuum stripping (IVS) system for oil-rich filamentous microalgae Tribonema sp. cultivation. A higher electric field strength, higher temperature, and lower pH conditions showed higher efficiency in decolorization and nutrients removal during EF application. In the group of 30:1 (N:P) ratio, Tribonema sp. had the largest biomass accumulation (2.04 g·L−1) after 14 days cultivation. However, the 20:1 group had highest oil accumulation (oil content 55.4 ± 3.4%), while 30:1 (N: P) group was 42.3 ± 1.8%. Under the conditions of sufficient nitrogen (50:1 group), the highest contents of α-linolenic acid (15.5%) and ω-3 fatty acids (21.8%) were reached. The integrated treatment of EF, IVS and microalgae cultivation demonstrated to be effective for nutrients recycling and sustainable biomass production.

Original languageEnglish (US)
Article number123718
JournalBioresource Technology
Volume314
DOIs
StatePublished - Oct 2020

Bibliographical note

Funding Information:
This research was supported in part by the National Natural Science Foundation of China ( 21978120 ), and the Jiangsu Government Scholarship for Overseas Studies.

Keywords

  • Anaerobic digestion wastewater
  • Electro-coagulation
  • Fattyacid composition
  • Nutrient recovery
  • Tribonema sp.

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