RESEARCH ON <i>CHLORELLA</i>'<i>S</i> AMMONIA NITROGEN TREATMENT ABILITY AND BIOMASS PRODUCTION UNDER DIFFERENT pH CONDITIONS

JIANG Ren-yuan; ZHU Shun-ni; WANG Zhong-ming; YUAN Zhen-hong

doi:10.13205/j.hjgc.202109007

Volume 39 Issue 9

Jan. 2022

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JIANG Ren-yuan, ZHU Shun-ni, WANG Zhong-ming, YUAN Zhen-hong. RESEARCH ON CHLORELLA'S AMMONIA NITROGEN TREATMENT ABILITY AND BIOMASS PRODUCTION UNDER DIFFERENT pH CONDITIONS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 42-47. doi: 10.13205/j.hjgc.202109007

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JIANG Ren-yuan, ZHU Shun-ni, WANG Zhong-ming, YUAN Zhen-hong. RESEARCH ON CHLORELLA'S AMMONIA NITROGEN TREATMENT ABILITY AND BIOMASS PRODUCTION UNDER DIFFERENT pH CONDITIONS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 42-47. doi: 10.13205/j.hjgc.202109007

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RESEARCH ON CHLORELLA'S AMMONIA NITROGEN TREATMENT ABILITY AND BIOMASS PRODUCTION UNDER DIFFERENT pH CONDITIONS

doi: 10.13205/j.hjgc.202109007

JIANG Ren-yuan^1,2,3,4,
ZHU Shun-ni^{1,2,3
,
,},
WANG Zhong-ming^1,2,3,
YUAN Zhen-hong^1,2,3

1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China;
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;
4. University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2020-09-08
Available Online: 2022-01-21

Abstract

Abstract

Biogas slurry contains appreciable levels of nitrogen, particularly ammonia that can lead to potential air and water quality problems. In this study, the ammonia-nitrogen treatment capacity and biomass utilization potential of Chlorella was tested at different pH levels. Chlorella was cultivated in simulated wastewater at four different pH levels (6.5, 7.5, 8.5, 9.5) with initial ammonia nitrogen concentration in the range of 120~130 mg/L. The results showed that the removal of ammonia nitrogen was better at pH 6.5~7.5. When pH increased more than 8.5, high concentration of free ammonia had a major inhibitory effect on the growth of Chlorella. In terms of chlorophyll accumulation in algal cells, Chlorella preferred a pH range from 6.5 to 8.5. The highest lipid producitivity of Chlorella (0.30 g/L/d) was achieved at pH7.5, which was consistent with the suitable pH condition for Chlorella growth. It is proposed that controlling pH value between 6.5~7.5 would be conduciue for removal of ammonia nitrogen and wastewater recycling when using Chlorella to treat biogas slurry.
- Chlorella,
- ammonia nitrogen concentration,
- pH,
- biomass production

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References(29)

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