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Treatment of fracturing wastewater using microalgae‐bacteria consortium
Author(s) -
Li Ran,
Pan Jie,
Yan Minmin,
Yang Jiang,
Qin Wenlong,
Liu Yang
Publication year - 2020
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23631
Subject(s) - chlorella vulgaris , response surface methodology , wastewater , bacteria , dilution , chlorella , biomass (ecology) , microorganism , chemistry , food science , botany , biology , algae , environmental engineering , environmental science , chromatography , agronomy , genetics , physics , thermodynamics
The symbiotic relationships between Chlorella vulgaris and Bacillus bacteria in fracturing wastewater treatment were investigated under different conditions, including varying dilution ratios of fracturing wastewater (2‐4), dosages of bacteria (20 mg/L‐80 mg/L), and pH (6.5‐8.5). The effects of process variables on the response of algal density were optimized and investigated via the Box‐Behnken response surface design. The individual and interactive effects of process variables on the response were studied by a second‐order polynomial model and three‐dimensional response surface plots. The optimal treatment conditions were a dilution ratio of 2, bacteria dose of 72.13 mg/L, and pH of 6.5, and the maximum biomass concentration of Chlorella vulgaris was 2.23 g/L. Moreover, Bacillus bacteria can increase the activity of superoxide dismutase (SOD) and acetyl‐CoA carboxylase (ACCase) of Chlorella vulgaris . Compared to the free Chlorella vulgaris , the co‐cultivation of Chlorella and Bacillus bacteria can improve the algal growth and degradation of organic pollutants.
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