Adsorption and degradation in the removal of nonylphenol from water by cells immobilized on biochar
Citation:
Lou, L., H. Qian, Y. Lou, J. Lu, B. Hu, AND Q. Lin. Adsorption and degradation in the removal of nonylphenol from water by cells immobilized on biochar. CHEMOSPHERE. Elsevier Science Ltd, New York, NY, 228:676-684, (2019). https://doi.org/10.1016/j.chemosphere.2019.04.151
Impact/Purpose:
Nonylphenol (NP), an environmental estrogen, persists in sewage sludge from wastewater treatment plants. To investigate the role of adsorption by biochar and biodegradation by bacteria in the system of microorganisms immobilized on biochar, Nonylphenol (NP) degrading bacteria immobilized on bamboo charcoal (BC) and wood charcoal (WC) were tested for the short-term and long-term removal of NP in water. Results showed that cells immobilized on different biochar had different NP removal effects, and cells immobilized on bamboo charcoal (I-BC) was better. It is essential to examine the amount of adsorption and degradation and clarify the fate of pollutants in the bacteria-biochar system. The results from this study may be interested in scientists and waste water treatment engineers.
Description:
To investigate the role of adsorption by biochar and biodegradation by bacteria in the wastewater treatment system of microorganisms immobilized on biochar, Nonylphenol (NP) removal (adsorption + degradation) rates and degradation rates from water by NP degrading bacteria immobilized on bamboo charcoal (BC) and wood charcoal (WC) were examined in a short-term and long-term. Results showed that cells immobilized on different biochar had different NP removal effects, and cells immobilized on bamboo charcoal (I-BC) was better. After eight rounds of long-term reuse, the cumulative removal rate and the degradation rate of NP in water by I-BC were 93.95% and 41.86%, respectively, significantly higher than those of cells immobilized on wood charcoal (69.60%, 22.78%) and free cells (64.79%, 19.49%) (P < 0.01). The rise in the ratio of the degradation rate to the removal rate indicated that the long-term NP removal effect is more dependent on biodegradation. The amount of residual NP in I-BC still accounted for about 50%, indicating that the secondary pollution in the disposal of carrier could not be ignored. In addition, promotion effect of biochar on microorganisms were observed by SEM, quantitative PCR and 16S rRNA. Pseudomonas, Achromobacter, Ochrobactrum and Stenotrophomonas were predominant bacteria for NP degradation. The addition of biochar (especially bamboo charcoal) also effectively delayed the transformation of their community structure.
URLs/Downloads:
DOI: Adsorption and degradation in the removal of nonylphenol from water by cells immobilized on biochar