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

Energies

Zhiqiang Gu¹  Guyue Zou¹  Ting Zhou¹  Hongli Zheng¹  Shuyu Xiang¹  Yuhuan Liu¹  Roger Ruan¹  Mingzhi Liu¹  Qi Zhang¹  Xiaodan Wu¹  Qiaoyun Huang¹  Hongbin Yan¹  Yunpu Wang¹ 

[1] Engineering Research Center for Biomass Conversion, MOE, Nanchang University, Nanchang 330047, China;

关键词: pig urine;    Chlorella vulgaris;    photosynthetic reactor;    nutrient removal;    chlorophyll fluorescence;    hydraulic retention time;   

DOI  :  10.3390/en13071644

来源: DOAJ

【 摘 要 】

Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH₄⁺-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. NH₄⁺-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 MgSO₄·7H₂O 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 NH₄⁺-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.

【 授权许可】

Unknown