Study on performance and mechanism of enhanced low-concentration ammonia nitrogen removal from low-temperature wastewater by iron-loaded biological activated carbon filter.
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| Title: | Study on performance and mechanism of enhanced low-concentration ammonia nitrogen removal from low-temperature wastewater by iron-loaded biological activated carbon filter. |
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| Authors: | Ren, Zhijun1 (AUTHOR), Fu, Xiaolin1 (AUTHOR), Zhang, Guangming1 (AUTHOR), Li, Yuyou2 (AUTHOR), Qin, Yu2 (AUTHOR), Wang, Pengfei1 (AUTHOR), Liu, Xiaoyang1 (AUTHOR), Lv, Longyi1 (AUTHOR) lvlongyi@hebut.edu.cn |
| Source: | Journal of Environmental Management. Jan2022, Vol. 301, pN.PAG-N.PAG. 1p. |
| Subjects: | Iron, Sewage purification, Activated carbon, Ferric oxide, Nucleotide sequencing, Ammonia, Sewage, Psychrophilic bacteria |
| Abstract: | In order to strengthen the treatment of low-concentration ammonia nitrogen wastewater at low temperature, iron-loaded activated carbon (Fe-AC) with ultrasonic impregnation method was used as the filter material of biofilter process. The performance and mechanism of ammonia nitrogen removal from simulated secondary wastewater by iron-loaded biological activated carbon filter (Fe-BACF) were studied at 10 °C. The characterization results showed that iron was loaded on the surface of AC in the form of Fe 2 O 3 , and the specific surface area, total pore volume, pore size and alkaline functional group content of Fe-AC were obviously increased. After the formation of biofilm on the surface of filter media, the average removal rate of ammonia nitrogen by Fe-BACF (97.9%) was significantly higher than that of conventional BACF (87.8%). The improved surface properties increased the number and metabolic activity of microorganisms, and promoted the secretion of EPS on the surface of Fe-BAC. The results of high-throughput sequencing showed that the existence of Fe optimized the bacterial community structure on the surface of Fe-BAC, with the increase of the abundances of psychrophilic bacteria and ammonia nitrogen removal bacteria. The mechanism of enhanced ammonia nitrogen removal by Fe-BACF was the joint action of many factors, among which the main causal relationship was that modification of iron could optimize the number and category of microorganisms on Fe-BAC surface by improving the surface properties, thus improving the biological nitrogen removal ability. Results of this study provided a practical way for the treatment of low ammonia nitrogen wastewater in cold regions. [Display omitted] • Surface pore size and volume of iron-loaded activated carbon (Fe-AC) became larger. • Fe-BAC filter showed better ammonia nitrogen removal capacity at low temperature. • More biomass and stronger biological activity appeared on the surface of Fe-BAC. • Modification of Fe promoted synthesis of more EPS on the surface of Fe-BAC. • Bacterial community structure on the surface of AC was optimized by Fe modification. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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