摘要
采用超声辐射与活性炭联用预处理难生物降解硝基苯废水,采用活性污泥法处理来研究硝基苯的降解工艺参数。预处理:先用活性炭吸附后搅拌,过滤,再用超声辐射处理;这种方法的最佳条件是:活性炭加入量为9g,在频率为400Hz、超声辐射时间为3s、间歇时间为1.5s条件下,超声全程时间35min,废水中硝基苯浓度为80mg/L(CODCr为51 000mg/L),pH值为7时,CODCr去除率最高达到97.7%;CODCr降至1 178mg/L时,硝基苯降解率为90.5%。在偏碱性条件下,采用活性污泥法,停留60h的CODCr去除率为91%,氨氮的去除率为56.2%。通过超声辐射与活性炭联用预处理后,再用活性污泥法进一步处理硝基苯废水,最终其CODCr可降至110mg/L,CODCr去除率可达99.8%,硝基苯基本被完全降解,处理效果好。
The treatment of wastewater containing nitrobenzene is difficult by microbiology which influenced the result of dealing with the wastewater containing nitrobenzene. Pretreatment of nitrobenzene was the treatment by activated carbon coorperating with ultrasonic. The wastewater was deeply treated by activated sludge process. Pretreatment contained two steps：absorbed by activated carbon and delt with by ultrasonic. The perfect conditions were that frequency was 400 Hz,treatment time was 3 s and intermission time was 1.5 s by ultrasonic and total time was 35 min, the amount of activated carbon was 9 g, the concentration of nitroberlzene was 80 mg/L and pH value was 7. The rate of removing of CODcr could be up to 97.7%,CODcr could cut down to 1 178 mg/L, the rate of removing of nitrobenzene could be up to 90.5%. By using activated sludge process lasting 60 h,the rate of removing of CODCr could be up to 91%, the rate of removing of NH3-N could be up to 56.2%. After the pretreatment of activated carbon followed by ultrasonicand deep-treatment of activated sludge process, the rate of removing of CODer could be up to 99.8 %, CODer could cut down to 110 mg/L, the nitrobenzene was completely degradated.
出处
《煤炭与化工》
CAS
2013年第1期73-78,96,共7页
Coal and Chemical Industry
关键词
超声波
活性炭
活性污泥法
好氧生化法
硝基苯
CODCR
ultrasonic
activated carbon
activated sludge process
aerobiochemistry
nitrobenzene
CODcr
