选择性生物强化处理二元互抑体系中苯胺和硝基苯

采用树脂吸附与生物强化相组合的方法处理含有苯胺和硝基苯的混合废水,对苯胺和硝基苯的降解抑制类型、吸附分离条件、生物强化降解过程与树脂性能变化等进行了研究.结果表明,硝基苯与苯胺均对对方的生物降解产生抑制;当进水中苯胺与硝基苯浓度分别为330与44mg/L时,在pH为4且流速为110mL/h条件下,通过装填有10mL吸附树脂NDA-150(7.2g)的吸附柱,吸附出水中硝基苯浓度低于4mg/L;吸附出水中苯胺的浓度保持不变,可通过生物强化而得到降解;吸附过程中约有597mg的硝基苯被树脂所吸附,其中约有224mg可通过生物强化方法得到脱附降解,系统降解硝基苯的容积负荷为315mg/(L·d);在此过程中树脂吸附能力获得部分恢复,其再生程度受到微生物对硝基苯降解能力的限制;70d的重复性实验证明,树脂性能保持稳定.

Biological Treatment of Nitrobenzene and Aniline in Interactional Inhibitory System Through the Selective Bioaugmentation

The mixed wastewater containing aniline and nitrobenzene was treated through combining adsorption and bioaugmentation. Tests were conducted to investigate the inhibition of aniline and nitrobenzene on another biodegradation, the condition of adsorption separation, the biodegradation process through bioaugmentation and the variation of resin performance. The experimental results showed that aniline and nitrobenzene interactional inhibited another biodegradation. Adjusting pH to 4 and absorption velocity to 110 mL/h, the mixed wastewater of aniline (330 mg/L) and nitrobenzene (44 mg/L) passed through the adsorption column containing 10 mL resin NDA-150 (7.2 g). In the adsorption effluent the nitrobenzene concentration was not more than 4 mg/L and aniline concentration had no change. The residual aniline in effluent could be degraded through bioaugmentation. During this process about 597 mg nitrobenzene had been adsorbed by resin, in which 224 mg could be desorbed and biodegraded through bioaugmentation. The volumetric loading to nitrobenzene was 315 mg/(L·d). Through bioregeneration the adsorption capacity of resin NDA-150 could be recovered partly, which extent was limited by the bioavailability to nitrobenzene. After about 70 d recycled experiment the performance of resin NDA-150 was stable.