Development of an effective acidogenically digested swine manure-based algal system for improved wastewater treatment and biofuel and feed production

Bing Hu, Wenguang Zhou, Min Min, Zhenyi Du, Paul Chen, Xiaochen Ma, Yuhuan Liu, Hanwu Lei, Jian Shi, Roger Ruan

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

An effective semi-continuous process was developed to grow a locally isolated green microalga Chlorella sp. on acidogenically digested swine wastewater in bench scale for improved algal biomass production and waste nutrient removal using central composite design (CCD). The influences of two key parameters, namely wastewater dilution rate (DR) and hydraulic retention time (HRT), on algal biomass productivity and nutrient removal rates were investigated. The optimal parameters estimated from the significant second-order quadratic models (p<. 0.05) were 8-fold DR and 2.26-d HRT. The cultivating experiment in a bench-scale multi-layer photobioreactor with the optimized conditions achieved stable algal productivity and nutrient removal rates, which fitted the predictive models well. Moreover, relatively high and stable protein and lipid contents (58.78% and 26.09% of the dry weight, respectively) were observed for the collected algae sample, indicating the suitability of the algal biomass as ideal feedstock for both biofuel and feed production.

Original languageEnglish (US)
Pages (from-to)255-263
Number of pages9
JournalApplied Energy
Volume107
DOIs
StatePublished - Jul 2013

Bibliographical note

Funding Information:
The study was supported in part by grants from Minnesota Legislative – Citizen Commission on Minnesota Resource (LCCMR), China 863 Projects (Grant Nos.: 2012AA021205 ; 2012AA101800-03 ; 2012AA021704 ; 2012AA101809 ), China International Cooperation Projects (Grant Nos.: 2009DFA61680 ; 2010DFB63750 ), NSF of China (Grant No.: 21177067 ), and the Key Program of Natural Science of the Jiangsu Province of China (Grant No.: BK2010034).

Keywords

  • Acidogenically digested swine manure
  • Biofuel feedstock production
  • Central composite design
  • Chlorella sp.
  • Nutrient removal

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