朱军伟　尹伟　米鹏　唐晓婵　冯维春

摘 要：利用粉煤灰作为吸附剂，分别对生化处理前焦化废水和生化处理后焦化废水进行了吸附处理，并将处理效果进行了对比，考察了pH值，药剂投加量，吸附时间，吸附溫度等因素对处理效果的影响，得出最佳处理条件为：废水pH值为5左右时，每100 mL废水中加入6 g粉煤灰，吸附时间为40 min，处理后焦化废水的COD和色度可达污水综合排放标准（GB8978—96）中二级排放标准。对吸附处理后的焦化废水利用Fenton试剂进一步氧化处理，每升废水中投加1.40 g FeSO4，1 mL质量分数为30%双氧水，氧化30 min后，废水中COD、色度以及含油量均达到污水综合排放标准（GB8978—96）中一级排放标准，并且此种处理方法比单独用Fenton氧化法处理，每升废水可节约3 mL双氧水和4.2 g FeSO4，大大减少了药剂使用量，减少了废水处理的成本。

关 键 词：粉煤灰；吸附；Fenton氧化；焦化废水

中图分类号：X703 文献标识码： A 文章编号： 1671-0460（2017）07-1311-04

Combined Treatment of Coking Wastewater

by Ash Adsorption and Fenton Oxidation

ZHU Jun-wei1，2， YIN Wei3， MI Peng1，2， TANG Xiao-chan1，2， FENG Wei-chun1，2

（1. Qingdao University of Science & Technology， Shandong Jinan 250014， China；

2. Organic Reaction in Aqueous Engineering Research Center of Shandong Province， Shandong Chemical Industry Research Institute，Shandong Jinan 250014， China；

3. Shandong Chunxu Chemical Engineering Design Co. ，Ltd.， Shandong Jinan 250014， China）

Abstract： Coking waste water before biological treatment and coking waste water after biological treatment were adsorbed by using fly ash as adsorbent，and the adsorption results were compared. The influence of PH value， chemical dosage， adsorption time and temperature on treatment effect was studied. The optimum conditions were obtained as follows：PH value about 5， fly ash 6 g per 100 mL wastewater and adsorption time 40 min. COD and chromaticity of the waste water after treatment can reach to level 2 emission standards of the Integrated Wastewater Discharge Standard （GB8978-96 ）. Coking wastewater after adsorption treatment was oxidized with Fenton reagent， 1.4 g FeSO4 and 1 mL hydrogen peroxide（30%） were added in 1 L wastewater， COD and chromaticity and oil content of the wastewater after oxidizing treatment for 30 min can reach to level 1 emission standards of the Integrated Wastewater Discharge Standard （GB8978-96 ）. This approach can save 3 mL hydrogen peroxide and 4 g FeSO4 per 1 L wastewater compared with alone Fenton oxidation， greatly reducing drug use and the cost of wastewater treatment.

Key words： Fly ash；Adsorption；Fenton oxidation；Coking wastewater

焦化废水是一种典型的难降解有机废水[1]，按常规方法处理后，外排废水中的COD 、色度、及含油量等依然难以达标，为了进一步去除焦化废水中的有毒污染物，进行回用，必须进行深度处理。粉煤灰吸附法因为其灵活、高效的吸附效率，容易操作的特点，能够去除多种化学污染物，是焦化废水深度处理的一种有效途径[2]。

粉煤灰是一种具有火山灰活性的微细粉末，主要化学组分是Al2O3、Fe2SO4、SiO2等约占总量的70%以上[3]。粉煤灰颗粒物理组织多孔，比表面积较大，具有较高的吸附活性[4]。我国每年煤消耗量约11亿t，粉煤灰年排放量约1.8亿t，即……