摘要 针对活性炭与活性焦两种碳基吸附材料,分别开展静态吸附与动态过滤实验,考察了两者对城镇再生水厂二级出水中有机物的去除效果。结果表明:活性焦介孔及大孔丰富,对应孔体积为0.436 cm3/g,为活性炭的1.6倍;准二级动力学模型更适用于两种材料对COD的吸附动力学拟合,活性焦动力学吸附速率常数k2为活性炭的2倍;水温为22℃时,活性焦与活性炭对COD的Langmuir饱和吸附量分别为230.38、94.14 mg/g。在近4个月的连续运行中,活性焦滤柱对有机物的去除效果全程优于活性炭滤柱,尽管两滤柱在由单纯吸附向生物吸附降解转化的过程中对有机物的去除率有所降低,但对COD的去除率仍可分别稳定在28.43%和22.26%。活性焦颗粒与活性炭颗粒表面ATP含量最高分别为7032.94、5753.52 ng/g。此外,活性焦滤柱对1~10 ku有机物组分,以及腐殖酸类物质、溶解性微生物代谢产物等不同荧光特性有机物均有较好的去除效果。与活性炭相比,活性焦对再生水厂二级出水中有机物的去除效果更优。 In this study,batch adsorption and continuous filtration experiments were conducted to investigate the effectiveness of activated coke and activated carbon for removing organic matters from secondary effluents of water reclamation plant.The activated coke was shown to be a mesoporous structure with macropores and mesopores volume of 0.436 cm3/g,which was 1.6 times higher than that of activated carbon.Kinetic studies revealed that the quasi-second-order kinetic model was more suitable for simulating COD adsorption by two materials,and the adsorption rate constant k2of COD onto activated coke was twice as high as it for activated carbon at dosage of 1.0 g/L.The saturated adsorption capacity for COD was 230.38 mg/g and 94.14 mg/g using activated coke and activated carbon respectively based on Langmuir isotherm at 22℃.Continuous filtration experiments showed that the activated coke filter performed better than the activated carbon filter in organic matters removal during four months operation.The removal efficiency of COD gradually decreased in development of fresh activated coke and activated carbon to biological activated coke and activated carbon,and finally maintained at 28.43%and 22.26%respectively.The total adenosine tri-phosphate(ATP)content of activated coke and activated carbon particles was 7032.94 ng/g and 5753.52 ng/g.In addition,activated coke filter obtained an effective removal of organic fractions with molecular weight of 1-10 ku,as well as organic matters with different fluorescent characteristics,such as fulvic acid and soluble microbial products.Compared with activated carbon,activated coke is more effective in organic matters removal from secondary effluents.
机构地区 北京工业大学北京市水质科学与水环境恢复工程重点实验室 北京城市排水集团有限责任公司 北京市污水资源化工程技术研究中心
出处 《中国给水排水》 CAS CSCD 北大核心 2021年第5期43-50,共8页 China Water & Wastewater
基金 国家重点研发计划项目(2018YFC0406300)。
关键词 活性炭 活性焦 生物活性焦 二级出水 再生水厂 activated carbon activated coke biological activated coke secondary effluent water reclamation plant
分类号 TU992 [建筑科学—市政工程]
