Biodegradation enhancement of BEAC process based on pore structure regulation of carbons
GONG Xu-jin1, DONG Yu-qi1, LI Wei-guang2
1. School of Energy and Civil Engineering, Harbin University of Commerce, Harbin 150028, China;
2. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
In order to further enhance the immobilization capability and biodegradability of functional bacteria in bio-enhanced activated carbon process (BEAC), pore structure regulation of coal-based activated carbon was conducted by an innovative agglomerated procedure including CO2 oxidation and depth-activation. New type carbon XHIT was consequently prepared in the present work. Characterization results suggested that the volume (0.7041cm3/g) and ratio (63.95%) of meso-porous structure in carbon XHIT were significantly improved. Immobilization capability of functional bacteria on surface of XHIT was also improved synchronously during the pore-structure regulation. The initial immobilized biomass reached up to 9.13mmol/g(P), and its multiplication rate was 2.123mmol/(g·d)(P). After depth-activation process, surface oxygen content of XHIT was improved to 9.96%, which caused the significant reduction of dissolved oxygen affinity ((0.42±0.07)mg DO/L) during the adsorption process. And this phenomenon also enhanced the dissolved oxygen utilization efficiency in biodegradation (91.28%). Based on carbon XHIT, BEAC pilot process system was established for purification of source water from Songhua River. Results shows that the removal efficiency and cumulative uptake of organic-pollutants represented by CODMn reached to (70.65±15.22)% and 94655.50mg·CODMn/(kg·Carbon), respectively, with the KBV of 39.50m3/kg.
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GONG Xu-jin, DONG Yu-qi, LI Wei-guang. Biodegradation enhancement of BEAC process based on pore structure regulation of carbons. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1920-1927.
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