基于孔结构调控强化BEAC工艺生物降解效能

为进一步提升生物增强活性炭工艺（BEAC）中炭表面的功能菌载持量及生物降解活性，通过CO₂接触氧化与深度活化相结合的压块炭制备改进工艺对煤质净水炭的孔结构进行调控.结果表明：基于改进工艺制备的XHIT型炭的中孔容积（0.7041cm³/g）及中孔容积率（63.95%）显著提高，其表面复合功能菌初始固定化生物量达到9.13mmol/g（以P计），增殖速率为2.123mmol/（g·d）（以P计）.深度活化产生的高含氧量（9.96%）显著降低了XHIT型炭表面吸附作用对水中溶解氧亲和度（（0.42±0.07）mg DO/L），功能菌生物降解对水中溶解氧的利用效率达到91.17%.基于XHIT型炭构建的BEAC工艺（通水倍数为39.50m³/kg）对松花江水源水中的微量有机污染物（COD_Mn）的平均去除率达到（70.65±15.22）%，有机污染物累积去除量达到94655.50mg COD_Mn/kg炭.

Biodegradation enhancement of BEAC process based on pore structure regulation of carbons

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 COD_Mn reached to (70.65±15.22)% and 94655.50mg·COD_Mn/(kg·Carbon), respectively, with the KBV of 39.50m³/kg.