Cultivation of Chlorella vulgaris in manure-free piggery wastewater with high-strength ammonium for nutrients removal and biomass production: Effect of ammonium concentration, carbon/nitrogen ratio and pH

Hongli Zheng, Xiaodan Wu, Guyue Zou, Ting Zhou, Yuhuan Liu, Roger Ruan

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Ammonia toxicity is a major disadvantage of microalgal growth when high-strength ammonium wastewaters like manure-free piggery wastewater (MFPW) were used as microalgal growth medium. In the present study, the effect of ammonium concentration, carbon/nitrogen ratio, and pH on ammonia toxicity of Chlorella vulgaris cultivated in the MFPW and nutrients removal was investigated. The three important parameters affected ammonia toxicity of C. vulgaris and nutrients removal of the MFPW significantly. The ammonium concentration of the MFPW could be decreased by air stripping. Microalga grew best at a carbon/nitrogen ratio of 25:1 with the maximum biomass concentration of 3.83 g L−1, the highest cell viability of 97%, and the removal of 100% ammonia, 95% of total phosphorus, and 99% of chemical oxygen demand. Ammonia toxicity was alleviated by pH control. The application of the established strategies can enhance nutrients removal of the MFPW while mitigating ammonia toxicity of C. vulgaris.

Original languageEnglish (US)
Pages (from-to)203-211
Number of pages9
JournalBioresource Technology
Volume273
DOIs
StatePublished - Feb 2019

Bibliographical note

Funding Information:
This work was supported in part by grants from the National Natural Science Foundation of China (Grant No. 21767017 ), and the Science and Technology Project of Jiangxi Provincial Department of Science and Technology , China (Grant No. 20171BBF60024 ), and the Innovation and Entrepreneurship Development Fund of “Thousand Talents Program” Talent of Jiangxi Province, China (Grant No. 1001-02102082 ).

Keywords

  • Ammonia toxicity
  • Manure-free piggery wastewater
  • Microalga
  • Nutrients removal

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