Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Guyue Zou, Yuhuan Liu, Qi Zhang, Ting Zhou, Shuyu Xiang, Zhiqiang Gu, Qiaoyun Huang, Hongbin Yan, Hongli Zheng, Xiaodan Wu, Yunpu Wang, Roger Ruan and Mingzhi Liu
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Guyue Zou: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Yuhuan Liu: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Qi Zhang: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Ting Zhou: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Shuyu Xiang: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Zhiqiang Gu: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Qiaoyun Huang: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Hongbin Yan: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Hongli Zheng: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Xiaodan Wu: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Yunpu Wang: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Roger Ruan: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China
Mingzhi Liu: Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China

Energies, 2020, vol. 13, issue 7, 1-15

Abstract: Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH 4 + -N, high pH and insufficient magnesium. In this study, fresh pig urine was pretreated by dilution, pH adjustment, and magnesium addition in order to polish wastewater and produce microalgae biomass. Chlorella vulgaris was cultured in an in-house-designed light-receiving-plate (LRP)-enhanced raceway pond to treat the pretreated pig urine in both batch and continuous mode under outdoor conditions. NH 4 + -N and TP in wastewater were detected, and the growth of C. vulgaris was evaluated by chlorophyll fluorescence activity as well as biomass production. Results indicated that an 8-fold dilution, pH adjusted to 6.0 and MgSO 4 ·7H 2 O dosage of 0.1 mg·L −1 would be optimal for the pig urine pretreatment. C. vulgaris could stably accumulate biomass in the LRP-enhanced raceway pond when cultured by both BG11 medium and the pretreated pig urine. About 1.72 g·m −2 ·day −1 of microalgal biomass could be produced and 98.20% of NH 4 + -N and 68.48% of TP could be removed during batch treatment. Hydraulic retention time of 7-9d would be optimal for both efficient nutrient removal and microalgal biomass production during continuous treatment.

Keywords: pig urine; Chlorella vulgaris; photosynthetic reactor; nutrient removal; chlorophyll fluorescence; hydraulic retention time (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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